Fixing race issues

- Refactored chromedp-gen and cdp code so that Execute no longer returns
  a channel
- Fixing potential race problems in handler
- Eliminated some dead code
- Updated examples to include new logging parameters

cdp/accessibility/accessibility.go

@@ -10,7 +10,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // GetPartialAXTreeParams fetches the accessibility node and partial
@@ -49,44 +48,12 @@ type GetPartialAXTreeReturns struct {
 // returns:
 //   nodes - The Accessibility.AXNode for this DOM node, if it exists, plus its ancestors, siblings and children, if requested.
 func (p *GetPartialAXTreeParams) Do(ctxt context.Context, h cdp.Handler) (nodes []*AXNode, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetPartialAXTreeReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandAccessibilityGetPartialAXTree, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.Nodes, nil
-	ch := h.Execute(ctxt, cdp.CommandAccessibilityGetPartialAXTree, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetPartialAXTreeReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.Nodes, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }

cdp/animation/animation.go

@@ -11,7 +11,6 @@ import (
 
 	cdp "github.com/knq/chromedp/cdp"
 	"github.com/knq/chromedp/cdp/runtime"
-	"github.com/mailru/easyjson"
 )
 
 // EnableParams enables animation domain notifications.
@@ -25,33 +24,7 @@ func Enable() *EnableParams {
 // Do executes Animation.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandAnimationEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandAnimationEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams disables animation domain notifications.
@@ -65,33 +38,7 @@ func Disable() *DisableParams {
 // Do executes Animation.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandAnimationDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandAnimationDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetPlaybackRateParams gets the playback rate of the document timeline.
@@ -113,40 +60,14 @@ type GetPlaybackRateReturns struct {
 // returns:
 //   playbackRate - Playback rate for animations on page.
 func (p *GetPlaybackRateParams) Do(ctxt context.Context, h cdp.Handler) (playbackRate float64, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandAnimationGetPlaybackRate, cdp.Empty)
+	var res GetPlaybackRateReturns
-
+	err = h.Execute(ctxt, cdp.CommandAnimationGetPlaybackRate, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return 0, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetPlaybackRateReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return 0, cdp.ErrInvalidResult
+		return 0, err
 	}
 
-			return r.PlaybackRate, nil
+	return res.PlaybackRate, nil
-
-		case error:
-			return 0, v
-		}
-
-	case <-ctxt.Done():
-		return 0, ctxt.Err()
-	}
-
-	return 0, cdp.ErrUnknownResult
 }
 
 // SetPlaybackRateParams sets the playback rate of the document timeline.
@@ -167,39 +88,7 @@ func SetPlaybackRate(playbackRate float64) *SetPlaybackRateParams {
 // Do executes Animation.setPlaybackRate against the provided context and
 // target handler.
 func (p *SetPlaybackRateParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandAnimationSetPlaybackRate, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandAnimationSetPlaybackRate, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetCurrentTimeParams returns the current time of the an animation.
@@ -228,46 +117,14 @@ type GetCurrentTimeReturns struct {
 // returns:
 //   currentTime - Current time of the page.
 func (p *GetCurrentTimeParams) Do(ctxt context.Context, h cdp.Handler) (currentTime float64, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetCurrentTimeReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandAnimationGetCurrentTime, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return 0, err
 	}
 
-	// execute
+	return res.CurrentTime, nil
-	ch := h.Execute(ctxt, cdp.CommandAnimationGetCurrentTime, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return 0, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetCurrentTimeReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return 0, cdp.ErrInvalidResult
-			}
-
-			return r.CurrentTime, nil
-
-		case error:
-			return 0, v
-		}
-
-	case <-ctxt.Done():
-		return 0, ctxt.Err()
-	}
-
-	return 0, cdp.ErrUnknownResult
 }
 
 // SetPausedParams sets the paused state of a set of animations.
@@ -291,39 +148,7 @@ func SetPaused(animations []string, paused bool) *SetPausedParams {
 // Do executes Animation.setPaused against the provided context and
 // target handler.
 func (p *SetPausedParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandAnimationSetPaused, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandAnimationSetPaused, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetTimingParams sets the timing of an animation node.
@@ -350,39 +175,7 @@ func SetTiming(animationID string, duration float64, delay float64) *SetTimingPa
 // Do executes Animation.setTiming against the provided context and
 // target handler.
 func (p *SetTimingParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandAnimationSetTiming, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandAnimationSetTiming, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SeekAnimationsParams seek a set of animations to a particular time within
@@ -408,39 +201,7 @@ func SeekAnimations(animations []string, currentTime float64) *SeekAnimationsPar
 // Do executes Animation.seekAnimations against the provided context and
 // target handler.
 func (p *SeekAnimationsParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandAnimationSeekAnimations, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandAnimationSeekAnimations, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ReleaseAnimationsParams releases a set of animations to no longer be
@@ -463,39 +224,7 @@ func ReleaseAnimations(animations []string) *ReleaseAnimationsParams {
 // Do executes Animation.releaseAnimations against the provided context and
 // target handler.
 func (p *ReleaseAnimationsParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandAnimationReleaseAnimations, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandAnimationReleaseAnimations, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ResolveAnimationParams gets the remote object of the Animation.
@@ -524,44 +253,12 @@ type ResolveAnimationReturns struct {
 // returns:
 //   remoteObject - Corresponding remote object.
 func (p *ResolveAnimationParams) Do(ctxt context.Context, h cdp.Handler) (remoteObject *runtime.RemoteObject, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res ResolveAnimationReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandAnimationResolveAnimation, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.RemoteObject, nil
-	ch := h.Execute(ctxt, cdp.CommandAnimationResolveAnimation, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r ResolveAnimationReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.RemoteObject, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }

cdp/applicationcache/applicationcache.go

@@ -10,7 +10,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // GetFramesWithManifestsParams returns array of frame identifiers with
@@ -36,40 +35,14 @@ type GetFramesWithManifestsReturns struct {
 // returns:
 //   frameIds - Array of frame identifiers with manifest urls for each frame containing a document associated with some application cache.
 func (p *GetFramesWithManifestsParams) Do(ctxt context.Context, h cdp.Handler) (frameIds []*FrameWithManifest, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandApplicationCacheGetFramesWithManifests, cdp.Empty)
+	var res GetFramesWithManifestsReturns
-
+	err = h.Execute(ctxt, cdp.CommandApplicationCacheGetFramesWithManifests, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetFramesWithManifestsReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return nil, cdp.ErrInvalidResult
+		return nil, err
 	}
 
-			return r.FrameIds, nil
+	return res.FrameIds, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // EnableParams enables application cache domain notifications.
@@ -83,33 +56,7 @@ func Enable() *EnableParams {
 // Do executes ApplicationCache.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandApplicationCacheEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandApplicationCacheEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetManifestForFrameParams returns manifest URL for document in the given
@@ -139,46 +86,14 @@ type GetManifestForFrameReturns struct {
 // returns:
 //   manifestURL - Manifest URL for document in the given frame.
 func (p *GetManifestForFrameParams) Do(ctxt context.Context, h cdp.Handler) (manifestURL string, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetManifestForFrameReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandApplicationCacheGetManifestForFrame, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return "", err
 	}
 
-	// execute
+	return res.ManifestURL, nil
-	ch := h.Execute(ctxt, cdp.CommandApplicationCacheGetManifestForFrame, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return "", cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetManifestForFrameReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return "", cdp.ErrInvalidResult
-			}
-
-			return r.ManifestURL, nil
-
-		case error:
-			return "", v
-		}
-
-	case <-ctxt.Done():
-		return "", ctxt.Err()
-	}
-
-	return "", cdp.ErrUnknownResult
 }
 
 // GetApplicationCacheForFrameParams returns relevant application cache data
@@ -209,44 +124,12 @@ type GetApplicationCacheForFrameReturns struct {
 // returns:
 //   applicationCache - Relevant application cache data for the document in given frame.
 func (p *GetApplicationCacheForFrameParams) Do(ctxt context.Context, h cdp.Handler) (applicationCache *ApplicationCache, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetApplicationCacheForFrameReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandApplicationCacheGetApplicationCacheForFrame, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.ApplicationCache, nil
-	ch := h.Execute(ctxt, cdp.CommandApplicationCacheGetApplicationCacheForFrame, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetApplicationCacheForFrameReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.ApplicationCache, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }

cdp/cachestorage/cachestorage.go

@@ -10,7 +10,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // RequestCacheNamesParams requests cache names.
@@ -39,46 +38,14 @@ type RequestCacheNamesReturns struct {
 // returns:
 //   caches - Caches for the security origin.
 func (p *RequestCacheNamesParams) Do(ctxt context.Context, h cdp.Handler) (caches []*Cache, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res RequestCacheNamesReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandCacheStorageRequestCacheNames, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.Caches, nil
-	ch := h.Execute(ctxt, cdp.CommandCacheStorageRequestCacheNames, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r RequestCacheNamesReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.Caches, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // RequestEntriesParams requests data from cache.
@@ -115,46 +82,14 @@ type RequestEntriesReturns struct {
 //   cacheDataEntries - Array of object store data entries.
 //   hasMore - If true, there are more entries to fetch in the given range.
 func (p *RequestEntriesParams) Do(ctxt context.Context, h cdp.Handler) (cacheDataEntries []*DataEntry, hasMore bool, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res RequestEntriesReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandCacheStorageRequestEntries, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, false, err
 	}
 
-	// execute
+	return res.CacheDataEntries, res.HasMore, nil
-	ch := h.Execute(ctxt, cdp.CommandCacheStorageRequestEntries, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, false, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r RequestEntriesReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, false, cdp.ErrInvalidResult
-			}
-
-			return r.CacheDataEntries, r.HasMore, nil
-
-		case error:
-			return nil, false, v
-		}
-
-	case <-ctxt.Done():
-		return nil, false, ctxt.Err()
-	}
-
-	return nil, false, cdp.ErrUnknownResult
 }
 
 // DeleteCacheParams deletes a cache.
@@ -175,39 +110,7 @@ func DeleteCache(cacheID CacheID) *DeleteCacheParams {
 // Do executes CacheStorage.deleteCache against the provided context and
 // target handler.
 func (p *DeleteCacheParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandCacheStorageDeleteCache, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandCacheStorageDeleteCache, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DeleteEntryParams deletes a cache entry.
@@ -231,37 +134,5 @@ func DeleteEntry(cacheID CacheID, request string) *DeleteEntryParams {
 // Do executes CacheStorage.deleteEntry against the provided context and
 // target handler.
 func (p *DeleteEntryParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandCacheStorageDeleteEntry, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandCacheStorageDeleteEntry, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/cachestorage/easyjson.go

@@ -17,7 +17,317 @@ var (
 	_ easyjson.Marshaler
 )
 
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage(in *jlexer.Lexer, out *RequestEntriesReturns) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage(in *jlexer.Lexer, out *Cache) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "cacheId":
+			out.CacheID = CacheID(in.String())
+		case "securityOrigin":
+			out.SecurityOrigin = string(in.String())
+		case "cacheName":
+			out.CacheName = string(in.String())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage(out *jwriter.Writer, in Cache) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if in.CacheID != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"cacheId\":")
+		out.String(string(in.CacheID))
+	}
+	if in.SecurityOrigin != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"securityOrigin\":")
+		out.String(string(in.SecurityOrigin))
+	}
+	if in.CacheName != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"cacheName\":")
+		out.String(string(in.CacheName))
+	}
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v Cache) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v Cache) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *Cache) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *Cache) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage1(in *jlexer.Lexer, out *DataEntry) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "request":
+			out.Request = string(in.String())
+		case "response":
+			out.Response = string(in.String())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage1(out *jwriter.Writer, in DataEntry) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if in.Request != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"request\":")
+		out.String(string(in.Request))
+	}
+	if in.Response != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"response\":")
+		out.String(string(in.Response))
+	}
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v DataEntry) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage1(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v DataEntry) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage1(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *DataEntry) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage1(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *DataEntry) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage1(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage2(in *jlexer.Lexer, out *DeleteEntryParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "cacheId":
+			out.CacheID = CacheID(in.String())
+		case "request":
+			out.Request = string(in.String())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage2(out *jwriter.Writer, in DeleteEntryParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if !first {
+		out.RawByte(',')
+	}
+	first = false
+	out.RawString("\"cacheId\":")
+	out.String(string(in.CacheID))
+	if !first {
+		out.RawByte(',')
+	}
+	first = false
+	out.RawString("\"request\":")
+	out.String(string(in.Request))
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v DeleteEntryParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage2(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v DeleteEntryParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage2(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *DeleteEntryParams) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage2(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *DeleteEntryParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage2(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage3(in *jlexer.Lexer, out *DeleteCacheParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "cacheId":
+			out.CacheID = CacheID(in.String())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage3(out *jwriter.Writer, in DeleteCacheParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if !first {
+		out.RawByte(',')
+	}
+	first = false
+	out.RawString("\"cacheId\":")
+	out.String(string(in.CacheID))
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v DeleteCacheParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage3(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v DeleteCacheParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage3(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *DeleteCacheParams) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage3(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *DeleteCacheParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage3(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage4(in *jlexer.Lexer, out *RequestEntriesReturns) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -75,7 +385,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage(in *jlexer.Lexer,
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage(out *jwriter.Writer, in RequestEntriesReturns) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage4(out *jwriter.Writer, in RequestEntriesReturns) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -116,27 +426,27 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage(out *jwriter.Writ
 // MarshalJSON supports json.Marshaler interface
 func (v RequestEntriesReturns) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage4(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v RequestEntriesReturns) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage4(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *RequestEntriesReturns) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage(&r, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage4(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
 func (v *RequestEntriesReturns) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage(l, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage4(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage1(in *jlexer.Lexer, out *RequestEntriesParams) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage5(in *jlexer.Lexer, out *RequestEntriesParams) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -171,7 +481,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage1(in *jlexer.Lexer
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage1(out *jwriter.Writer, in RequestEntriesParams) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage5(out *jwriter.Writer, in RequestEntriesParams) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -199,27 +509,27 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage1(out *jwriter.Wri
 // MarshalJSON supports json.Marshaler interface
 func (v RequestEntriesParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage1(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage5(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v RequestEntriesParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage1(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage5(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *RequestEntriesParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage1(&r, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage5(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
 func (v *RequestEntriesParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage1(l, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage5(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage2(in *jlexer.Lexer, out *RequestCacheNamesReturns) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage6(in *jlexer.Lexer, out *RequestCacheNamesReturns) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -275,7 +585,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage2(in *jlexer.Lexer
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage2(out *jwriter.Writer, in RequestCacheNamesReturns) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage6(out *jwriter.Writer, in RequestCacheNamesReturns) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -308,27 +618,27 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage2(out *jwriter.Wri
 // MarshalJSON supports json.Marshaler interface
 func (v RequestCacheNamesReturns) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage2(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage6(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v RequestCacheNamesReturns) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage2(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage6(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *RequestCacheNamesReturns) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage2(&r, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage6(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
 func (v *RequestCacheNamesReturns) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage2(l, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage6(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage3(in *jlexer.Lexer, out *RequestCacheNamesParams) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage7(in *jlexer.Lexer, out *RequestCacheNamesParams) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -359,7 +669,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage3(in *jlexer.Lexer
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage3(out *jwriter.Writer, in RequestCacheNamesParams) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage7(out *jwriter.Writer, in RequestCacheNamesParams) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -374,334 +684,24 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage3(out *jwriter.Wri
 
 // MarshalJSON supports json.Marshaler interface
 func (v RequestCacheNamesParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage3(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v RequestCacheNamesParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage3(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *RequestCacheNamesParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage3(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *RequestCacheNamesParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage3(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage4(in *jlexer.Lexer, out *DeleteEntryParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "cacheId":
-			out.CacheID = CacheID(in.String())
-		case "request":
-			out.Request = string(in.String())
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage4(out *jwriter.Writer, in DeleteEntryParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if !first {
-		out.RawByte(',')
-	}
-	first = false
-	out.RawString("\"cacheId\":")
-	out.String(string(in.CacheID))
-	if !first {
-		out.RawByte(',')
-	}
-	first = false
-	out.RawString("\"request\":")
-	out.String(string(in.Request))
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v DeleteEntryParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage4(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v DeleteEntryParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage4(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *DeleteEntryParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage4(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *DeleteEntryParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage4(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage5(in *jlexer.Lexer, out *DeleteCacheParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "cacheId":
-			out.CacheID = CacheID(in.String())
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage5(out *jwriter.Writer, in DeleteCacheParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if !first {
-		out.RawByte(',')
-	}
-	first = false
-	out.RawString("\"cacheId\":")
-	out.String(string(in.CacheID))
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v DeleteCacheParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage5(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v DeleteCacheParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage5(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *DeleteCacheParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage5(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *DeleteCacheParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage5(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage6(in *jlexer.Lexer, out *DataEntry) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "request":
-			out.Request = string(in.String())
-		case "response":
-			out.Response = string(in.String())
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage6(out *jwriter.Writer, in DataEntry) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if in.Request != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"request\":")
-		out.String(string(in.Request))
-	}
-	if in.Response != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"response\":")
-		out.String(string(in.Response))
-	}
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v DataEntry) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage6(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v DataEntry) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage6(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *DataEntry) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage6(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *DataEntry) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage6(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage7(in *jlexer.Lexer, out *Cache) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "cacheId":
-			out.CacheID = CacheID(in.String())
-		case "securityOrigin":
-			out.SecurityOrigin = string(in.String())
-		case "cacheName":
-			out.CacheName = string(in.String())
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage7(out *jwriter.Writer, in Cache) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if in.CacheID != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"cacheId\":")
-		out.String(string(in.CacheID))
-	}
-	if in.SecurityOrigin != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"securityOrigin\":")
-		out.String(string(in.SecurityOrigin))
-	}
-	if in.CacheName != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"cacheName\":")
-		out.String(string(in.CacheName))
-	}
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v Cache) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage7(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v Cache) MarshalEasyJSON(w *jwriter.Writer) {
+func (v RequestCacheNamesParams) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpCachestorage7(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *Cache) UnmarshalJSON(data []byte) error {
+func (v *RequestCacheNamesParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage7(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *Cache) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *RequestCacheNamesParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpCachestorage7(l, v)
 }

cdp/cdp.go

@@ -1352,7 +1352,7 @@ type Handler interface {
 
 	// Execute executes the specified command using the supplied context and
 	// parameters.
-	Execute(context.Context, MethodType, easyjson.RawMessage) <-chan interface{}
+	Execute(context.Context, MethodType, easyjson.Marshaler, easyjson.Unmarshaler) error
 
 	// Listen creates a channel that will receive an event for the types
 	// specified.
@@ -1362,9 +1362,6 @@ type Handler interface {
 	Release(<-chan interface{})
 }
 
-// Empty is an empty JSON object message.
-var Empty = easyjson.RawMessage(`{}`)
-
 // FrameID unique frame identifier.
 type FrameID string
 

cdp/database/database.go

@@ -26,33 +26,7 @@ func Enable() *EnableParams {
 // Do executes Database.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDatabaseEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDatabaseEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams disables database tracking, prevents database events from
@@ -68,33 +42,7 @@ func Disable() *DisableParams {
 // Do executes Database.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDatabaseDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDatabaseDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetDatabaseTableNamesParams [no description].
@@ -123,46 +71,14 @@ type GetDatabaseTableNamesReturns struct {
 // returns:
 //   tableNames
 func (p *GetDatabaseTableNamesParams) Do(ctxt context.Context, h cdp.Handler) (tableNames []string, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetDatabaseTableNamesReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandDatabaseGetDatabaseTableNames, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.TableNames, nil
-	ch := h.Execute(ctxt, cdp.CommandDatabaseGetDatabaseTableNames, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetDatabaseTableNamesReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.TableNames, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // ExecuteSQLParams [no description].
@@ -198,44 +114,12 @@ type ExecuteSQLReturns struct {
 //   values
 //   sqlError
 func (p *ExecuteSQLParams) Do(ctxt context.Context, h cdp.Handler) (columnNames []string, values []easyjson.RawMessage, sqlError *Error, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res ExecuteSQLReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandDatabaseExecuteSQL, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, nil, nil, err
 	}
 
-	// execute
+	return res.ColumnNames, res.Values, res.SQLError, nil
-	ch := h.Execute(ctxt, cdp.CommandDatabaseExecuteSQL, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, nil, nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r ExecuteSQLReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, nil, nil, cdp.ErrInvalidResult
-			}
-
-			return r.ColumnNames, r.Values, r.SQLError, nil
-
-		case error:
-			return nil, nil, nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, nil, nil, ctxt.Err()
-	}
-
-	return nil, nil, nil, cdp.ErrUnknownResult
 }

cdp/database/easyjson.go

@@ -17,7 +17,7 @@ var (
 	_ easyjson.Marshaler
 )
 
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase(in *jlexer.Lexer, out *GetDatabaseTableNamesReturns) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase(in *jlexer.Lexer, out *Error) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -36,25 +36,10 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase(in *jlexer.Lexer, out
 			continue
 		}
 		switch key {
-		case "tableNames":
+		case "message":
-			if in.IsNull() {
+			out.Message = string(in.String())
-				in.Skip()
+		case "code":
-				out.TableNames = nil
+			out.Code = int64(in.Int64())
-			} else {
-				in.Delim('[')
-				if !in.IsDelim(']') {
-					out.TableNames = make([]string, 0, 4)
-				} else {
-					out.TableNames = []string{}
-				}
-				for !in.IsDelim(']') {
-					var v1 string
-					v1 = string(in.String())
-					out.TableNames = append(out.TableNames, v1)
-					in.WantComma()
-				}
-				in.Delim(']')
-			}
 		default:
 			in.SkipRecursive()
 		}
@@ -65,56 +50,53 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase(in *jlexer.Lexer, out
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase(out *jwriter.Writer, in GetDatabaseTableNamesReturns) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase(out *jwriter.Writer, in Error) {
 	out.RawByte('{')
 	first := true
 	_ = first
-	if len(in.TableNames) != 0 {
+	if in.Message != "" {
 		if !first {
 			out.RawByte(',')
 		}
 		first = false
-		out.RawString("\"tableNames\":")
+		out.RawString("\"message\":")
-		if in.TableNames == nil && (out.Flags&jwriter.NilSliceAsEmpty) == 0 {
+		out.String(string(in.Message))
-			out.RawString("null")
+	}
-		} else {
+	if in.Code != 0 {
-			out.RawByte('[')
+		if !first {
-			for v2, v3 := range in.TableNames {
-				if v2 > 0 {
 			out.RawByte(',')
 		}
-				out.String(string(v3))
+		first = false
-			}
+		out.RawString("\"code\":")
-			out.RawByte(']')
+		out.Int64(int64(in.Code))
-		}
 	}
 	out.RawByte('}')
 }
 
 // MarshalJSON supports json.Marshaler interface
-func (v GetDatabaseTableNamesReturns) MarshalJSON() ([]byte, error) {
+func (v Error) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v GetDatabaseTableNamesReturns) MarshalEasyJSON(w *jwriter.Writer) {
+func (v Error) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *GetDatabaseTableNamesReturns) UnmarshalJSON(data []byte) error {
+func (v *Error) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *GetDatabaseTableNamesReturns) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *Error) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase1(in *jlexer.Lexer, out *GetDatabaseTableNamesParams) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase1(in *jlexer.Lexer, out *Database) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -133,8 +115,14 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase1(in *jlexer.Lexer, ou
 			continue
 		}
 		switch key {
-		case "databaseId":
+		case "id":
-			out.DatabaseID = ID(in.String())
+			out.ID = ID(in.String())
+		case "domain":
+			out.Domain = string(in.String())
+		case "name":
+			out.Name = string(in.String())
+		case "version":
+			out.Version = string(in.String())
 		default:
 			in.SkipRecursive()
 		}
@@ -145,275 +133,69 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase1(in *jlexer.Lexer, ou
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase1(out *jwriter.Writer, in GetDatabaseTableNamesParams) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase1(out *jwriter.Writer, in Database) {
 	out.RawByte('{')
 	first := true
 	_ = first
+	if in.ID != "" {
 		if !first {
 			out.RawByte(',')
 		}
 		first = false
-	out.RawString("\"databaseId\":")
+		out.RawString("\"id\":")
-	out.String(string(in.DatabaseID))
+		out.String(string(in.ID))
+	}
+	if in.Domain != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"domain\":")
+		out.String(string(in.Domain))
+	}
+	if in.Name != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"name\":")
+		out.String(string(in.Name))
+	}
+	if in.Version != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"version\":")
+		out.String(string(in.Version))
+	}
 	out.RawByte('}')
 }
 
 // MarshalJSON supports json.Marshaler interface
-func (v GetDatabaseTableNamesParams) MarshalJSON() ([]byte, error) {
+func (v Database) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase1(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v GetDatabaseTableNamesParams) MarshalEasyJSON(w *jwriter.Writer) {
+func (v Database) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase1(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *GetDatabaseTableNamesParams) UnmarshalJSON(data []byte) error {
+func (v *Database) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase1(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *GetDatabaseTableNamesParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *Database) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase1(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase2(in *jlexer.Lexer, out *ExecuteSQLReturns) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase2(in *jlexer.Lexer, out *EventAddDatabase) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "columnNames":
-			if in.IsNull() {
-				in.Skip()
-				out.ColumnNames = nil
-			} else {
-				in.Delim('[')
-				if !in.IsDelim(']') {
-					out.ColumnNames = make([]string, 0, 4)
-				} else {
-					out.ColumnNames = []string{}
-				}
-				for !in.IsDelim(']') {
-					var v4 string
-					v4 = string(in.String())
-					out.ColumnNames = append(out.ColumnNames, v4)
-					in.WantComma()
-				}
-				in.Delim(']')
-			}
-		case "values":
-			if in.IsNull() {
-				in.Skip()
-				out.Values = nil
-			} else {
-				in.Delim('[')
-				if !in.IsDelim(']') {
-					out.Values = make([]easyjson.RawMessage, 0, 2)
-				} else {
-					out.Values = []easyjson.RawMessage{}
-				}
-				for !in.IsDelim(']') {
-					var v5 easyjson.RawMessage
-					(v5).UnmarshalEasyJSON(in)
-					out.Values = append(out.Values, v5)
-					in.WantComma()
-				}
-				in.Delim(']')
-			}
-		case "sqlError":
-			if in.IsNull() {
-				in.Skip()
-				out.SQLError = nil
-			} else {
-				if out.SQLError == nil {
-					out.SQLError = new(Error)
-				}
-				(*out.SQLError).UnmarshalEasyJSON(in)
-			}
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase2(out *jwriter.Writer, in ExecuteSQLReturns) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if len(in.ColumnNames) != 0 {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"columnNames\":")
-		if in.ColumnNames == nil && (out.Flags&jwriter.NilSliceAsEmpty) == 0 {
-			out.RawString("null")
-		} else {
-			out.RawByte('[')
-			for v6, v7 := range in.ColumnNames {
-				if v6 > 0 {
-					out.RawByte(',')
-				}
-				out.String(string(v7))
-			}
-			out.RawByte(']')
-		}
-	}
-	if len(in.Values) != 0 {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"values\":")
-		if in.Values == nil && (out.Flags&jwriter.NilSliceAsEmpty) == 0 {
-			out.RawString("null")
-		} else {
-			out.RawByte('[')
-			for v8, v9 := range in.Values {
-				if v8 > 0 {
-					out.RawByte(',')
-				}
-				(v9).MarshalEasyJSON(out)
-			}
-			out.RawByte(']')
-		}
-	}
-	if in.SQLError != nil {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"sqlError\":")
-		if in.SQLError == nil {
-			out.RawString("null")
-		} else {
-			(*in.SQLError).MarshalEasyJSON(out)
-		}
-	}
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v ExecuteSQLReturns) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase2(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v ExecuteSQLReturns) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase2(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *ExecuteSQLReturns) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase2(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *ExecuteSQLReturns) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase2(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase3(in *jlexer.Lexer, out *ExecuteSQLParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "databaseId":
-			out.DatabaseID = ID(in.String())
-		case "query":
-			out.Query = string(in.String())
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase3(out *jwriter.Writer, in ExecuteSQLParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if !first {
-		out.RawByte(',')
-	}
-	first = false
-	out.RawString("\"databaseId\":")
-	out.String(string(in.DatabaseID))
-	if !first {
-		out.RawByte(',')
-	}
-	first = false
-	out.RawString("\"query\":")
-	out.String(string(in.Query))
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v ExecuteSQLParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase3(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v ExecuteSQLParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase3(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *ExecuteSQLParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase3(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *ExecuteSQLParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase3(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase4(in *jlexer.Lexer, out *EventAddDatabase) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -452,7 +234,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase4(in *jlexer.Lexer, ou
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase4(out *jwriter.Writer, in EventAddDatabase) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase2(out *jwriter.Writer, in EventAddDatabase) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -474,27 +256,259 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase4(out *jwriter.Writer,
 // MarshalJSON supports json.Marshaler interface
 func (v EventAddDatabase) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase4(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase2(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v EventAddDatabase) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase4(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase2(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *EventAddDatabase) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase2(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *EventAddDatabase) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase2(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase3(in *jlexer.Lexer, out *ExecuteSQLReturns) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "columnNames":
+			if in.IsNull() {
+				in.Skip()
+				out.ColumnNames = nil
+			} else {
+				in.Delim('[')
+				if !in.IsDelim(']') {
+					out.ColumnNames = make([]string, 0, 4)
+				} else {
+					out.ColumnNames = []string{}
+				}
+				for !in.IsDelim(']') {
+					var v1 string
+					v1 = string(in.String())
+					out.ColumnNames = append(out.ColumnNames, v1)
+					in.WantComma()
+				}
+				in.Delim(']')
+			}
+		case "values":
+			if in.IsNull() {
+				in.Skip()
+				out.Values = nil
+			} else {
+				in.Delim('[')
+				if !in.IsDelim(']') {
+					out.Values = make([]easyjson.RawMessage, 0, 2)
+				} else {
+					out.Values = []easyjson.RawMessage{}
+				}
+				for !in.IsDelim(']') {
+					var v2 easyjson.RawMessage
+					(v2).UnmarshalEasyJSON(in)
+					out.Values = append(out.Values, v2)
+					in.WantComma()
+				}
+				in.Delim(']')
+			}
+		case "sqlError":
+			if in.IsNull() {
+				in.Skip()
+				out.SQLError = nil
+			} else {
+				if out.SQLError == nil {
+					out.SQLError = new(Error)
+				}
+				(*out.SQLError).UnmarshalEasyJSON(in)
+			}
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase3(out *jwriter.Writer, in ExecuteSQLReturns) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if len(in.ColumnNames) != 0 {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"columnNames\":")
+		if in.ColumnNames == nil && (out.Flags&jwriter.NilSliceAsEmpty) == 0 {
+			out.RawString("null")
+		} else {
+			out.RawByte('[')
+			for v3, v4 := range in.ColumnNames {
+				if v3 > 0 {
+					out.RawByte(',')
+				}
+				out.String(string(v4))
+			}
+			out.RawByte(']')
+		}
+	}
+	if len(in.Values) != 0 {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"values\":")
+		if in.Values == nil && (out.Flags&jwriter.NilSliceAsEmpty) == 0 {
+			out.RawString("null")
+		} else {
+			out.RawByte('[')
+			for v5, v6 := range in.Values {
+				if v5 > 0 {
+					out.RawByte(',')
+				}
+				(v6).MarshalEasyJSON(out)
+			}
+			out.RawByte(']')
+		}
+	}
+	if in.SQLError != nil {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"sqlError\":")
+		if in.SQLError == nil {
+			out.RawString("null")
+		} else {
+			(*in.SQLError).MarshalEasyJSON(out)
+		}
+	}
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v ExecuteSQLReturns) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase3(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v ExecuteSQLReturns) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase3(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *ExecuteSQLReturns) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase3(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *ExecuteSQLReturns) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase3(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase4(in *jlexer.Lexer, out *ExecuteSQLParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "databaseId":
+			out.DatabaseID = ID(in.String())
+		case "query":
+			out.Query = string(in.String())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase4(out *jwriter.Writer, in ExecuteSQLParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if !first {
+		out.RawByte(',')
+	}
+	first = false
+	out.RawString("\"databaseId\":")
+	out.String(string(in.DatabaseID))
+	if !first {
+		out.RawByte(',')
+	}
+	first = false
+	out.RawString("\"query\":")
+	out.String(string(in.Query))
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v ExecuteSQLParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase4(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v ExecuteSQLParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase4(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *ExecuteSQLParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase4(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *EventAddDatabase) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *ExecuteSQLParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase4(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase5(in *jlexer.Lexer, out *Error) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase5(in *jlexer.Lexer, out *GetDatabaseTableNamesReturns) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -513,10 +527,25 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase5(in *jlexer.Lexer, ou
 			continue
 		}
 		switch key {
-		case "message":
+		case "tableNames":
-			out.Message = string(in.String())
+			if in.IsNull() {
-		case "code":
+				in.Skip()
-			out.Code = int64(in.Int64())
+				out.TableNames = nil
+			} else {
+				in.Delim('[')
+				if !in.IsDelim(']') {
+					out.TableNames = make([]string, 0, 4)
+				} else {
+					out.TableNames = []string{}
+				}
+				for !in.IsDelim(']') {
+					var v7 string
+					v7 = string(in.String())
+					out.TableNames = append(out.TableNames, v7)
+					in.WantComma()
+				}
+				in.Delim(']')
+			}
 		default:
 			in.SkipRecursive()
 		}
@@ -527,53 +556,56 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase5(in *jlexer.Lexer, ou
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase5(out *jwriter.Writer, in Error) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase5(out *jwriter.Writer, in GetDatabaseTableNamesReturns) {
 	out.RawByte('{')
 	first := true
 	_ = first
-	if in.Message != "" {
+	if len(in.TableNames) != 0 {
 		if !first {
 			out.RawByte(',')
 		}
 		first = false
-		out.RawString("\"message\":")
+		out.RawString("\"tableNames\":")
-		out.String(string(in.Message))
+		if in.TableNames == nil && (out.Flags&jwriter.NilSliceAsEmpty) == 0 {
-	}
+			out.RawString("null")
-	if in.Code != 0 {
+		} else {
-		if !first {
+			out.RawByte('[')
+			for v8, v9 := range in.TableNames {
+				if v8 > 0 {
 					out.RawByte(',')
 				}
-		first = false
+				out.String(string(v9))
-		out.RawString("\"code\":")
+			}
-		out.Int64(int64(in.Code))
+			out.RawByte(']')
+		}
 	}
 	out.RawByte('}')
 }
 
 // MarshalJSON supports json.Marshaler interface
-func (v Error) MarshalJSON() ([]byte, error) {
+func (v GetDatabaseTableNamesReturns) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase5(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v Error) MarshalEasyJSON(w *jwriter.Writer) {
+func (v GetDatabaseTableNamesReturns) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase5(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *Error) UnmarshalJSON(data []byte) error {
+func (v *GetDatabaseTableNamesReturns) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase5(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *Error) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *GetDatabaseTableNamesReturns) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase5(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase6(in *jlexer.Lexer, out *EnableParams) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase6(in *jlexer.Lexer, out *GetDatabaseTableNamesParams) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -592,6 +624,8 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase6(in *jlexer.Lexer, ou
 			continue
 		}
 		switch key {
+		case "databaseId":
+			out.DatabaseID = ID(in.String())
 		default:
 			in.SkipRecursive()
 		}
@@ -602,34 +636,40 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase6(in *jlexer.Lexer, ou
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase6(out *jwriter.Writer, in EnableParams) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase6(out *jwriter.Writer, in GetDatabaseTableNamesParams) {
 	out.RawByte('{')
 	first := true
 	_ = first
+	if !first {
+		out.RawByte(',')
+	}
+	first = false
+	out.RawString("\"databaseId\":")
+	out.String(string(in.DatabaseID))
 	out.RawByte('}')
 }
 
 // MarshalJSON supports json.Marshaler interface
-func (v EnableParams) MarshalJSON() ([]byte, error) {
+func (v GetDatabaseTableNamesParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase6(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v EnableParams) MarshalEasyJSON(w *jwriter.Writer) {
+func (v GetDatabaseTableNamesParams) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase6(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *EnableParams) UnmarshalJSON(data []byte) error {
+func (v *GetDatabaseTableNamesParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase6(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *EnableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *GetDatabaseTableNamesParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase6(l, v)
 }
 func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase7(in *jlexer.Lexer, out *DisableParams) {
@@ -691,7 +731,7 @@ func (v *DisableParams) UnmarshalJSON(data []byte) error {
 func (v *DisableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase7(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase8(in *jlexer.Lexer, out *Database) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase8(in *jlexer.Lexer, out *EnableParams) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -710,14 +750,6 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase8(in *jlexer.Lexer, ou
 			continue
 		}
 		switch key {
-		case "id":
-			out.ID = ID(in.String())
-		case "domain":
-			out.Domain = string(in.String())
-		case "name":
-			out.Name = string(in.String())
-		case "version":
-			out.Version = string(in.String())
 		default:
 			in.SkipRecursive()
 		}
@@ -728,65 +760,33 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase8(in *jlexer.Lexer, ou
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase8(out *jwriter.Writer, in Database) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase8(out *jwriter.Writer, in EnableParams) {
 	out.RawByte('{')
 	first := true
 	_ = first
-	if in.ID != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"id\":")
-		out.String(string(in.ID))
-	}
-	if in.Domain != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"domain\":")
-		out.String(string(in.Domain))
-	}
-	if in.Name != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"name\":")
-		out.String(string(in.Name))
-	}
-	if in.Version != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"version\":")
-		out.String(string(in.Version))
-	}
 	out.RawByte('}')
 }
 
 // MarshalJSON supports json.Marshaler interface
-func (v Database) MarshalJSON() ([]byte, error) {
+func (v EnableParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase8(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v Database) MarshalEasyJSON(w *jwriter.Writer) {
+func (v EnableParams) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDatabase8(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *Database) UnmarshalJSON(data []byte) error {
+func (v *EnableParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase8(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *Database) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *EnableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDatabase8(l, v)
 }

cdp/deviceorientation/deviceorientation.go

@@ -10,7 +10,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // SetDeviceOrientationOverrideParams overrides the Device Orientation.
@@ -37,39 +36,7 @@ func SetDeviceOrientationOverride(alpha float64, beta float64, gamma float64) *S
 // Do executes DeviceOrientation.setDeviceOrientationOverride against the provided context and
 // target handler.
 func (p *SetDeviceOrientationOverrideParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDeviceOrientationSetDeviceOrientationOverride, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDeviceOrientationSetDeviceOrientationOverride, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ClearDeviceOrientationOverrideParams clears the overridden Device
@@ -84,31 +51,5 @@ func ClearDeviceOrientationOverride() *ClearDeviceOrientationOverrideParams {
 // Do executes DeviceOrientation.clearDeviceOrientationOverride against the provided context and
 // target handler.
 func (p *ClearDeviceOrientationOverrideParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDeviceOrientationClearDeviceOrientationOverride, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDeviceOrientationClearDeviceOrientationOverride, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/deviceorientation/easyjson.go

@@ -17,7 +17,66 @@ var (
 	_ easyjson.Marshaler
 )
 
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDeviceorientation(in *jlexer.Lexer, out *SetDeviceOrientationOverrideParams) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDeviceorientation(in *jlexer.Lexer, out *ClearDeviceOrientationOverrideParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDeviceorientation(out *jwriter.Writer, in ClearDeviceOrientationOverrideParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v ClearDeviceOrientationOverrideParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDeviceorientation(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v ClearDeviceOrientationOverrideParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDeviceorientation(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *ClearDeviceOrientationOverrideParams) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDeviceorientation(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *ClearDeviceOrientationOverrideParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDeviceorientation(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDeviceorientation1(in *jlexer.Lexer, out *SetDeviceOrientationOverrideParams) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -52,7 +111,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDeviceorientation(in *jlexer.L
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDeviceorientation(out *jwriter.Writer, in SetDeviceOrientationOverrideParams) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDeviceorientation1(out *jwriter.Writer, in SetDeviceOrientationOverrideParams) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -79,83 +138,24 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDeviceorientation(out *jwriter
 
 // MarshalJSON supports json.Marshaler interface
 func (v SetDeviceOrientationOverrideParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDeviceorientation(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v SetDeviceOrientationOverrideParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDeviceorientation(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *SetDeviceOrientationOverrideParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDeviceorientation(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *SetDeviceOrientationOverrideParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDeviceorientation(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDeviceorientation1(in *jlexer.Lexer, out *ClearDeviceOrientationOverrideParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDeviceorientation1(out *jwriter.Writer, in ClearDeviceOrientationOverrideParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v ClearDeviceOrientationOverrideParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDeviceorientation1(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v ClearDeviceOrientationOverrideParams) MarshalEasyJSON(w *jwriter.Writer) {
+func (v SetDeviceOrientationOverrideParams) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpDeviceorientation1(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *ClearDeviceOrientationOverrideParams) UnmarshalJSON(data []byte) error {
+func (v *SetDeviceOrientationOverrideParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDeviceorientation1(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *ClearDeviceOrientationOverrideParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *SetDeviceOrientationOverrideParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpDeviceorientation1(l, v)
 }

cdp/domdebugger/domdebugger.go

@@ -15,7 +15,6 @@ import (
 
 	cdp "github.com/knq/chromedp/cdp"
 	"github.com/knq/chromedp/cdp/runtime"
-	"github.com/mailru/easyjson"
 )
 
 // SetDOMBreakpointParams sets breakpoint on particular operation with DOM.
@@ -39,39 +38,7 @@ func SetDOMBreakpoint(nodeID cdp.NodeID, typeVal DOMBreakpointType) *SetDOMBreak
 // Do executes DOMDebugger.setDOMBreakpoint against the provided context and
 // target handler.
 func (p *SetDOMBreakpointParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMDebuggerSetDOMBreakpoint, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMDebuggerSetDOMBreakpoint, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // RemoveDOMBreakpointParams removes DOM breakpoint that was set using
@@ -97,39 +64,7 @@ func RemoveDOMBreakpoint(nodeID cdp.NodeID, typeVal DOMBreakpointType) *RemoveDO
 // Do executes DOMDebugger.removeDOMBreakpoint against the provided context and
 // target handler.
 func (p *RemoveDOMBreakpointParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMDebuggerRemoveDOMBreakpoint, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMDebuggerRemoveDOMBreakpoint, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetEventListenerBreakpointParams sets breakpoint on particular DOM event.
@@ -158,39 +93,7 @@ func (p SetEventListenerBreakpointParams) WithTargetName(targetName string) *Set
 // Do executes DOMDebugger.setEventListenerBreakpoint against the provided context and
 // target handler.
 func (p *SetEventListenerBreakpointParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMDebuggerSetEventListenerBreakpoint, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMDebuggerSetEventListenerBreakpoint, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // RemoveEventListenerBreakpointParams removes breakpoint on particular DOM
@@ -219,39 +122,7 @@ func (p RemoveEventListenerBreakpointParams) WithTargetName(targetName string) *
 // Do executes DOMDebugger.removeEventListenerBreakpoint against the provided context and
 // target handler.
 func (p *RemoveEventListenerBreakpointParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMDebuggerRemoveEventListenerBreakpoint, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMDebuggerRemoveEventListenerBreakpoint, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetInstrumentationBreakpointParams sets breakpoint on particular native
@@ -273,39 +144,7 @@ func SetInstrumentationBreakpoint(eventName string) *SetInstrumentationBreakpoin
 // Do executes DOMDebugger.setInstrumentationBreakpoint against the provided context and
 // target handler.
 func (p *SetInstrumentationBreakpointParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMDebuggerSetInstrumentationBreakpoint, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMDebuggerSetInstrumentationBreakpoint, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // RemoveInstrumentationBreakpointParams removes breakpoint on particular
@@ -328,39 +167,7 @@ func RemoveInstrumentationBreakpoint(eventName string) *RemoveInstrumentationBre
 // Do executes DOMDebugger.removeInstrumentationBreakpoint against the provided context and
 // target handler.
 func (p *RemoveInstrumentationBreakpointParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMDebuggerRemoveInstrumentationBreakpoint, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMDebuggerRemoveInstrumentationBreakpoint, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetXHRBreakpointParams sets breakpoint on XMLHttpRequest.
@@ -381,39 +188,7 @@ func SetXHRBreakpoint(url string) *SetXHRBreakpointParams {
 // Do executes DOMDebugger.setXHRBreakpoint against the provided context and
 // target handler.
 func (p *SetXHRBreakpointParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMDebuggerSetXHRBreakpoint, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMDebuggerSetXHRBreakpoint, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // RemoveXHRBreakpointParams removes breakpoint from XMLHttpRequest.
@@ -434,39 +209,7 @@ func RemoveXHRBreakpoint(url string) *RemoveXHRBreakpointParams {
 // Do executes DOMDebugger.removeXHRBreakpoint against the provided context and
 // target handler.
 func (p *RemoveXHRBreakpointParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMDebuggerRemoveXHRBreakpoint, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMDebuggerRemoveXHRBreakpoint, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetEventListenersParams returns event listeners of the given object.
@@ -513,44 +256,12 @@ type GetEventListenersReturns struct {
 // returns:
 //   listeners - Array of relevant listeners.
 func (p *GetEventListenersParams) Do(ctxt context.Context, h cdp.Handler) (listeners []*EventListener, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetEventListenersReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandDOMDebuggerGetEventListeners, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.Listeners, nil
-	ch := h.Execute(ctxt, cdp.CommandDOMDebuggerGetEventListeners, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetEventListenersReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.Listeners, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }

cdp/domdebugger/types.go

@@ -68,6 +68,5 @@ type EventListener struct {
 	ColumnNumber    int64                 `json:"columnNumber,omitempty"`    // Column number in the script (0-based).
 	Handler         *runtime.RemoteObject `json:"handler,omitempty"`         // Event handler function value.
 	OriginalHandler *runtime.RemoteObject `json:"originalHandler,omitempty"` // Event original handler function value.
-	RemoveFunction  *runtime.RemoteObject `json:"removeFunction,omitempty"`  // Event listener remove function.
 	BackendNodeID   cdp.BackendNodeID     `json:"backendNodeId,omitempty"`   // Node the listener is added to (if any).
 }

cdp/domstorage/domstorage.go

@@ -12,7 +12,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // EnableParams enables storage tracking, storage events will now be
@@ -28,33 +27,7 @@ func Enable() *EnableParams {
 // Do executes DOMStorage.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMStorageEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMStorageEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams disables storage tracking, prevents storage events from
@@ -70,33 +43,7 @@ func Disable() *DisableParams {
 // Do executes DOMStorage.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMStorageDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMStorageDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ClearParams [no description].
@@ -117,39 +64,7 @@ func Clear(storageID *StorageID) *ClearParams {
 // Do executes DOMStorage.clear against the provided context and
 // target handler.
 func (p *ClearParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMStorageClear, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMStorageClear, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetDOMStorageItemsParams [no description].
@@ -178,46 +93,14 @@ type GetDOMStorageItemsReturns struct {
 // returns:
 //   entries
 func (p *GetDOMStorageItemsParams) Do(ctxt context.Context, h cdp.Handler) (entries []Item, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetDOMStorageItemsReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandDOMStorageGetDOMStorageItems, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.Entries, nil
-	ch := h.Execute(ctxt, cdp.CommandDOMStorageGetDOMStorageItems, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetDOMStorageItemsReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.Entries, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // SetDOMStorageItemParams [no description].
@@ -244,39 +127,7 @@ func SetDOMStorageItem(storageID *StorageID, key string, value string) *SetDOMSt
 // Do executes DOMStorage.setDOMStorageItem against the provided context and
 // target handler.
 func (p *SetDOMStorageItemParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMStorageSetDOMStorageItem, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMStorageSetDOMStorageItem, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // RemoveDOMStorageItemParams [no description].
@@ -300,37 +151,5 @@ func RemoveDOMStorageItem(storageID *StorageID, key string) *RemoveDOMStorageIte
 // Do executes DOMStorage.removeDOMStorageItem against the provided context and
 // target handler.
 func (p *RemoveDOMStorageItemParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandDOMStorageRemoveDOMStorageItem, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandDOMStorageRemoveDOMStorageItem, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/easyjson.go

@@ -679,7 +679,7 @@ func (v *Node) UnmarshalJSON(data []byte) error {
 func (v *Node) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp1(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp2(in *jlexer.Lexer, out *MessageError) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp2(in *jlexer.Lexer, out *BackendNode) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -698,10 +698,12 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp2(in *jlexer.Lexer, out *Messa
 			continue
 		}
 		switch key {
-		case "code":
+		case "nodeType":
-			out.Code = int64(in.Int64())
+			(out.NodeType).UnmarshalEasyJSON(in)
-		case "message":
+		case "nodeName":
-			out.Message = string(in.String())
+			out.NodeName = string(in.String())
+		case "backendNodeId":
+			(out.BackendNodeID).UnmarshalEasyJSON(in)
 		default:
 			in.SkipRecursive()
 		}
@@ -712,174 +714,61 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp2(in *jlexer.Lexer, out *Messa
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdp2(out *jwriter.Writer, in MessageError) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdp2(out *jwriter.Writer, in BackendNode) {
 	out.RawByte('{')
 	first := true
 	_ = first
-	if in.Code != 0 {
+	if in.NodeType != 0 {
 		if !first {
 			out.RawByte(',')
 		}
 		first = false
-		out.RawString("\"code\":")
+		out.RawString("\"nodeType\":")
-		out.Int64(int64(in.Code))
+		(in.NodeType).MarshalEasyJSON(out)
 	}
-	if in.Message != "" {
+	if in.NodeName != "" {
 		if !first {
 			out.RawByte(',')
 		}
 		first = false
-		out.RawString("\"message\":")
+		out.RawString("\"nodeName\":")
-		out.String(string(in.Message))
+		out.String(string(in.NodeName))
+	}
+	if in.BackendNodeID != 0 {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"backendNodeId\":")
+		out.Int64(int64(in.BackendNodeID))
 	}
 	out.RawByte('}')
 }
 
 // MarshalJSON supports json.Marshaler interface
-func (v MessageError) MarshalJSON() ([]byte, error) {
+func (v BackendNode) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdp2(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v MessageError) MarshalEasyJSON(w *jwriter.Writer) {
+func (v BackendNode) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdp2(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *MessageError) UnmarshalJSON(data []byte) error {
+func (v *BackendNode) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp2(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *MessageError) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *BackendNode) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp2(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp3(in *jlexer.Lexer, out *Message) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp3(in *jlexer.Lexer, out *Frame) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "id":
-			out.ID = int64(in.Int64())
-		case "method":
-			(out.Method).UnmarshalEasyJSON(in)
-		case "params":
-			(out.Params).UnmarshalEasyJSON(in)
-		case "result":
-			(out.Result).UnmarshalEasyJSON(in)
-		case "error":
-			if in.IsNull() {
-				in.Skip()
-				out.Error = nil
-			} else {
-				if out.Error == nil {
-					out.Error = new(MessageError)
-				}
-				(*out.Error).UnmarshalEasyJSON(in)
-			}
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdp3(out *jwriter.Writer, in Message) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if in.ID != 0 {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"id\":")
-		out.Int64(int64(in.ID))
-	}
-	if in.Method != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"method\":")
-		(in.Method).MarshalEasyJSON(out)
-	}
-	if (in.Params).IsDefined() {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"params\":")
-		(in.Params).MarshalEasyJSON(out)
-	}
-	if (in.Result).IsDefined() {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"result\":")
-		(in.Result).MarshalEasyJSON(out)
-	}
-	if in.Error != nil {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"error\":")
-		if in.Error == nil {
-			out.RawString("null")
-		} else {
-			(*in.Error).MarshalEasyJSON(out)
-		}
-	}
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v Message) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdp3(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v Message) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdp3(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *Message) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp3(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *Message) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp3(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp4(in *jlexer.Lexer, out *Frame) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -922,7 +811,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp4(in *jlexer.Lexer, out *Frame
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdp4(out *jwriter.Writer, in Frame) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdp3(out *jwriter.Writer, in Frame) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -988,27 +877,27 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdp4(out *jwriter.Writer, in Fram
 // MarshalJSON supports json.Marshaler interface
 func (v Frame) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdp4(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdp3(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v Frame) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdp4(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdp3(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *Frame) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp4(&r, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp3(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
 func (v *Frame) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp4(l, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp3(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp5(in *jlexer.Lexer, out *BackendNode) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp4(in *jlexer.Lexer, out *Message) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -1027,12 +916,24 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp5(in *jlexer.Lexer, out *Backe
 			continue
 		}
 		switch key {
-		case "nodeType":
+		case "id":
-			(out.NodeType).UnmarshalEasyJSON(in)
+			out.ID = int64(in.Int64())
-		case "nodeName":
+		case "method":
-			out.NodeName = string(in.String())
+			(out.Method).UnmarshalEasyJSON(in)
-		case "backendNodeId":
+		case "params":
-			(out.BackendNodeID).UnmarshalEasyJSON(in)
+			(out.Params).UnmarshalEasyJSON(in)
+		case "result":
+			(out.Result).UnmarshalEasyJSON(in)
+		case "error":
+			if in.IsNull() {
+				in.Skip()
+				out.Error = nil
+			} else {
+				if out.Error == nil {
+					out.Error = new(MessageError)
+				}
+				(*out.Error).UnmarshalEasyJSON(in)
+			}
 		default:
 			in.SkipRecursive()
 		}
@@ -1043,57 +944,156 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp5(in *jlexer.Lexer, out *Backe
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdp5(out *jwriter.Writer, in BackendNode) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdp4(out *jwriter.Writer, in Message) {
 	out.RawByte('{')
 	first := true
 	_ = first
-	if in.NodeType != 0 {
+	if in.ID != 0 {
 		if !first {
 			out.RawByte(',')
 		}
 		first = false
-		out.RawString("\"nodeType\":")
+		out.RawString("\"id\":")
-		(in.NodeType).MarshalEasyJSON(out)
+		out.Int64(int64(in.ID))
 	}
-	if in.NodeName != "" {
+	if in.Method != "" {
 		if !first {
 			out.RawByte(',')
 		}
 		first = false
-		out.RawString("\"nodeName\":")
+		out.RawString("\"method\":")
-		out.String(string(in.NodeName))
+		(in.Method).MarshalEasyJSON(out)
 	}
-	if in.BackendNodeID != 0 {
+	if (in.Params).IsDefined() {
 		if !first {
 			out.RawByte(',')
 		}
 		first = false
-		out.RawString("\"backendNodeId\":")
+		out.RawString("\"params\":")
-		out.Int64(int64(in.BackendNodeID))
+		(in.Params).MarshalEasyJSON(out)
+	}
+	if (in.Result).IsDefined() {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"result\":")
+		(in.Result).MarshalEasyJSON(out)
+	}
+	if in.Error != nil {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"error\":")
+		if in.Error == nil {
+			out.RawString("null")
+		} else {
+			(*in.Error).MarshalEasyJSON(out)
+		}
 	}
 	out.RawByte('}')
 }
 
 // MarshalJSON supports json.Marshaler interface
-func (v BackendNode) MarshalJSON() ([]byte, error) {
+func (v Message) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdp4(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v Message) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdp4(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *Message) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp4(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *Message) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp4(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdp5(in *jlexer.Lexer, out *MessageError) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "code":
+			out.Code = int64(in.Int64())
+		case "message":
+			out.Message = string(in.String())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdp5(out *jwriter.Writer, in MessageError) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if in.Code != 0 {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"code\":")
+		out.Int64(int64(in.Code))
+	}
+	if in.Message != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"message\":")
+		out.String(string(in.Message))
+	}
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v MessageError) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdp5(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v BackendNode) MarshalEasyJSON(w *jwriter.Writer) {
+func (v MessageError) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdp5(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *BackendNode) UnmarshalJSON(data []byte) error {
+func (v *MessageError) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp5(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *BackendNode) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *MessageError) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdp5(l, v)
 }

cdp/emulation/emulation.go

@@ -12,7 +12,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // SetDeviceMetricsOverrideParams overrides the values of device screen
@@ -98,39 +97,7 @@ func (p SetDeviceMetricsOverrideParams) WithScreenOrientation(screenOrientation
 // Do executes Emulation.setDeviceMetricsOverride against the provided context and
 // target handler.
 func (p *SetDeviceMetricsOverrideParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationSetDeviceMetricsOverride, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationSetDeviceMetricsOverride, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ClearDeviceMetricsOverrideParams clears the overriden device metrics.
@@ -144,33 +111,7 @@ func ClearDeviceMetricsOverride() *ClearDeviceMetricsOverrideParams {
 // Do executes Emulation.clearDeviceMetricsOverride against the provided context and
 // target handler.
 func (p *ClearDeviceMetricsOverrideParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationClearDeviceMetricsOverride, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationClearDeviceMetricsOverride, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ForceViewportParams overrides the visible area of the page. The change is
@@ -203,39 +144,7 @@ func ForceViewport(x float64, y float64, scale float64) *ForceViewportParams {
 // Do executes Emulation.forceViewport against the provided context and
 // target handler.
 func (p *ForceViewportParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationForceViewport, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationForceViewport, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ResetViewportParams resets the visible area of the page to the original
@@ -251,33 +160,7 @@ func ResetViewport() *ResetViewportParams {
 // Do executes Emulation.resetViewport against the provided context and
 // target handler.
 func (p *ResetViewportParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationResetViewport, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationResetViewport, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ResetPageScaleFactorParams requests that page scale factor is reset to
@@ -293,33 +176,7 @@ func ResetPageScaleFactor() *ResetPageScaleFactorParams {
 // Do executes Emulation.resetPageScaleFactor against the provided context and
 // target handler.
 func (p *ResetPageScaleFactorParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationResetPageScaleFactor, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationResetPageScaleFactor, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetPageScaleFactorParams sets a specified page scale factor.
@@ -340,39 +197,7 @@ func SetPageScaleFactor(pageScaleFactor float64) *SetPageScaleFactorParams {
 // Do executes Emulation.setPageScaleFactor against the provided context and
 // target handler.
 func (p *SetPageScaleFactorParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationSetPageScaleFactor, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationSetPageScaleFactor, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetVisibleSizeParams resizes the frame/viewport of the page. Note that
@@ -400,39 +225,7 @@ func SetVisibleSize(width int64, height int64) *SetVisibleSizeParams {
 // Do executes Emulation.setVisibleSize against the provided context and
 // target handler.
 func (p *SetVisibleSizeParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationSetVisibleSize, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationSetVisibleSize, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetScriptExecutionDisabledParams switches script execution in the page.
@@ -453,39 +246,7 @@ func SetScriptExecutionDisabled(value bool) *SetScriptExecutionDisabledParams {
 // Do executes Emulation.setScriptExecutionDisabled against the provided context and
 // target handler.
 func (p *SetScriptExecutionDisabledParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationSetScriptExecutionDisabled, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationSetScriptExecutionDisabled, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetGeolocationOverrideParams overrides the Geolocation Position or Error.
@@ -525,39 +286,7 @@ func (p SetGeolocationOverrideParams) WithAccuracy(accuracy float64) *SetGeoloca
 // Do executes Emulation.setGeolocationOverride against the provided context and
 // target handler.
 func (p *SetGeolocationOverrideParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationSetGeolocationOverride, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationSetGeolocationOverride, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ClearGeolocationOverrideParams clears the overriden Geolocation Position
@@ -573,33 +302,7 @@ func ClearGeolocationOverride() *ClearGeolocationOverrideParams {
 // Do executes Emulation.clearGeolocationOverride against the provided context and
 // target handler.
 func (p *ClearGeolocationOverrideParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationClearGeolocationOverride, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationClearGeolocationOverride, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetTouchEmulationEnabledParams toggles mouse event-based touch event
@@ -629,39 +332,7 @@ func (p SetTouchEmulationEnabledParams) WithConfiguration(configuration EnabledC
 // Do executes Emulation.setTouchEmulationEnabled against the provided context and
 // target handler.
 func (p *SetTouchEmulationEnabledParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationSetTouchEmulationEnabled, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationSetTouchEmulationEnabled, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetEmulatedMediaParams emulates the given media for CSS media queries.
@@ -682,39 +353,7 @@ func SetEmulatedMedia(media string) *SetEmulatedMediaParams {
 // Do executes Emulation.setEmulatedMedia against the provided context and
 // target handler.
 func (p *SetEmulatedMediaParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationSetEmulatedMedia, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationSetEmulatedMedia, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetCPUThrottlingRateParams enables CPU throttling to emulate slow CPUs.
@@ -735,39 +374,7 @@ func SetCPUThrottlingRate(rate float64) *SetCPUThrottlingRateParams {
 // Do executes Emulation.setCPUThrottlingRate against the provided context and
 // target handler.
 func (p *SetCPUThrottlingRateParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationSetCPUThrottlingRate, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationSetCPUThrottlingRate, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // CanEmulateParams tells whether emulation is supported.
@@ -789,40 +396,14 @@ type CanEmulateReturns struct {
 // returns:
 //   result - True if emulation is supported.
 func (p *CanEmulateParams) Do(ctxt context.Context, h cdp.Handler) (result bool, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationCanEmulate, cdp.Empty)
+	var res CanEmulateReturns
-
+	err = h.Execute(ctxt, cdp.CommandEmulationCanEmulate, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return false, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r CanEmulateReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return false, cdp.ErrInvalidResult
+		return false, err
 	}
 
-			return r.Result, nil
+	return res.Result, nil
-
-		case error:
-			return false, v
-		}
-
-	case <-ctxt.Done():
-		return false, ctxt.Err()
-	}
-
-	return false, cdp.ErrUnknownResult
 }
 
 // SetVirtualTimePolicyParams turns on virtual time for all frames (replacing
@@ -855,39 +436,7 @@ func (p SetVirtualTimePolicyParams) WithBudget(budget int64) *SetVirtualTimePoli
 // Do executes Emulation.setVirtualTimePolicy against the provided context and
 // target handler.
 func (p *SetVirtualTimePolicyParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationSetVirtualTimePolicy, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationSetVirtualTimePolicy, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetDefaultBackgroundColorOverrideParams sets or clears an override of the
@@ -916,37 +465,5 @@ func (p SetDefaultBackgroundColorOverrideParams) WithColor(color *cdp.RGBA) *Set
 // Do executes Emulation.setDefaultBackgroundColorOverride against the provided context and
 // target handler.
 func (p *SetDefaultBackgroundColorOverrideParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandEmulationSetDefaultBackgroundColorOverride, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandEmulationSetDefaultBackgroundColorOverride, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/heapprofiler/heapprofiler.go

@@ -11,7 +11,6 @@ import (
 
 	cdp "github.com/knq/chromedp/cdp"
 	"github.com/knq/chromedp/cdp/runtime"
-	"github.com/mailru/easyjson"
 )
 
 // EnableParams [no description].
@@ -25,33 +24,7 @@ func Enable() *EnableParams {
 // Do executes HeapProfiler.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandHeapProfilerEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandHeapProfilerEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams [no description].
@@ -65,33 +38,7 @@ func Disable() *DisableParams {
 // Do executes HeapProfiler.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandHeapProfilerDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandHeapProfilerDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // StartTrackingHeapObjectsParams [no description].
@@ -115,39 +62,7 @@ func (p StartTrackingHeapObjectsParams) WithTrackAllocations(trackAllocations bo
 // Do executes HeapProfiler.startTrackingHeapObjects against the provided context and
 // target handler.
 func (p *StartTrackingHeapObjectsParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandHeapProfilerStartTrackingHeapObjects, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandHeapProfilerStartTrackingHeapObjects, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // StopTrackingHeapObjectsParams [no description].
@@ -172,39 +87,7 @@ func (p StopTrackingHeapObjectsParams) WithReportProgress(reportProgress bool) *
 // Do executes HeapProfiler.stopTrackingHeapObjects against the provided context and
 // target handler.
 func (p *StopTrackingHeapObjectsParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandHeapProfilerStopTrackingHeapObjects, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandHeapProfilerStopTrackingHeapObjects, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // TakeHeapSnapshotParams [no description].
@@ -229,39 +112,7 @@ func (p TakeHeapSnapshotParams) WithReportProgress(reportProgress bool) *TakeHea
 // Do executes HeapProfiler.takeHeapSnapshot against the provided context and
 // target handler.
 func (p *TakeHeapSnapshotParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandHeapProfilerTakeHeapSnapshot, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandHeapProfilerTakeHeapSnapshot, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // CollectGarbageParams [no description].
@@ -275,33 +126,7 @@ func CollectGarbage() *CollectGarbageParams {
 // Do executes HeapProfiler.collectGarbage against the provided context and
 // target handler.
 func (p *CollectGarbageParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandHeapProfilerCollectGarbage, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandHeapProfilerCollectGarbage, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetObjectByHeapObjectIDParams [no description].
@@ -338,46 +163,14 @@ type GetObjectByHeapObjectIDReturns struct {
 // returns:
 //   result - Evaluation result.
 func (p *GetObjectByHeapObjectIDParams) Do(ctxt context.Context, h cdp.Handler) (result *runtime.RemoteObject, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetObjectByHeapObjectIDReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandHeapProfilerGetObjectByHeapObjectID, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.Result, nil
-	ch := h.Execute(ctxt, cdp.CommandHeapProfilerGetObjectByHeapObjectID, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetObjectByHeapObjectIDReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.Result, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // AddInspectedHeapObjectParams enables console to refer to the node with
@@ -400,39 +193,7 @@ func AddInspectedHeapObject(heapObjectID HeapSnapshotObjectID) *AddInspectedHeap
 // Do executes HeapProfiler.addInspectedHeapObject against the provided context and
 // target handler.
 func (p *AddInspectedHeapObjectParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandHeapProfilerAddInspectedHeapObject, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandHeapProfilerAddInspectedHeapObject, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetHeapObjectIDParams [no description].
@@ -461,46 +222,14 @@ type GetHeapObjectIDReturns struct {
 // returns:
 //   heapSnapshotObjectID - Id of the heap snapshot object corresponding to the passed remote object id.
 func (p *GetHeapObjectIDParams) Do(ctxt context.Context, h cdp.Handler) (heapSnapshotObjectID HeapSnapshotObjectID, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetHeapObjectIDReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandHeapProfilerGetHeapObjectID, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return "", err
 	}
 
-	// execute
+	return res.HeapSnapshotObjectID, nil
-	ch := h.Execute(ctxt, cdp.CommandHeapProfilerGetHeapObjectID, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return "", cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetHeapObjectIDReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return "", cdp.ErrInvalidResult
-			}
-
-			return r.HeapSnapshotObjectID, nil
-
-		case error:
-			return "", v
-		}
-
-	case <-ctxt.Done():
-		return "", ctxt.Err()
-	}
-
-	return "", cdp.ErrUnknownResult
 }
 
 // StartSamplingParams [no description].
@@ -525,39 +254,7 @@ func (p StartSamplingParams) WithSamplingInterval(samplingInterval float64) *Sta
 // Do executes HeapProfiler.startSampling against the provided context and
 // target handler.
 func (p *StartSamplingParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandHeapProfilerStartSampling, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandHeapProfilerStartSampling, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // StopSamplingParams [no description].
@@ -579,38 +276,12 @@ type StopSamplingReturns struct {
 // returns:
 //   profile - Recorded sampling heap profile.
 func (p *StopSamplingParams) Do(ctxt context.Context, h cdp.Handler) (profile *SamplingHeapProfile, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandHeapProfilerStopSampling, cdp.Empty)
+	var res StopSamplingReturns
-
+	err = h.Execute(ctxt, cdp.CommandHeapProfilerStopSampling, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r StopSamplingReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return nil, cdp.ErrInvalidResult
+		return nil, err
 	}
 
-			return r.Profile, nil
+	return res.Profile, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }

cdp/indexeddb/indexeddb.go

@@ -10,7 +10,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // EnableParams enables events from backend.
@@ -24,33 +23,7 @@ func Enable() *EnableParams {
 // Do executes IndexedDB.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandIndexedDBEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandIndexedDBEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams disables events from backend.
@@ -64,33 +37,7 @@ func Disable() *DisableParams {
 // Do executes IndexedDB.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandIndexedDBDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandIndexedDBDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // RequestDatabaseNamesParams requests database names for given security
@@ -120,46 +67,14 @@ type RequestDatabaseNamesReturns struct {
 // returns:
 //   databaseNames - Database names for origin.
 func (p *RequestDatabaseNamesParams) Do(ctxt context.Context, h cdp.Handler) (databaseNames []string, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res RequestDatabaseNamesReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandIndexedDBRequestDatabaseNames, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.DatabaseNames, nil
-	ch := h.Execute(ctxt, cdp.CommandIndexedDBRequestDatabaseNames, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r RequestDatabaseNamesReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.DatabaseNames, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // RequestDatabaseParams requests database with given name in given frame.
@@ -191,46 +106,14 @@ type RequestDatabaseReturns struct {
 // returns:
 //   databaseWithObjectStores - Database with an array of object stores.
 func (p *RequestDatabaseParams) Do(ctxt context.Context, h cdp.Handler) (databaseWithObjectStores *DatabaseWithObjectStores, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res RequestDatabaseReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandIndexedDBRequestDatabase, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.DatabaseWithObjectStores, nil
-	ch := h.Execute(ctxt, cdp.CommandIndexedDBRequestDatabase, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r RequestDatabaseReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.DatabaseWithObjectStores, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // RequestDataParams requests data from object store or index.
@@ -283,46 +166,14 @@ type RequestDataReturns struct {
 //   objectStoreDataEntries - Array of object store data entries.
 //   hasMore - If true, there are more entries to fetch in the given range.
 func (p *RequestDataParams) Do(ctxt context.Context, h cdp.Handler) (objectStoreDataEntries []*DataEntry, hasMore bool, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res RequestDataReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandIndexedDBRequestData, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, false, err
 	}
 
-	// execute
+	return res.ObjectStoreDataEntries, res.HasMore, nil
-	ch := h.Execute(ctxt, cdp.CommandIndexedDBRequestData, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, false, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r RequestDataReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, false, cdp.ErrInvalidResult
-			}
-
-			return r.ObjectStoreDataEntries, r.HasMore, nil
-
-		case error:
-			return nil, false, v
-		}
-
-	case <-ctxt.Done():
-		return nil, false, ctxt.Err()
-	}
-
-	return nil, false, cdp.ErrUnknownResult
 }
 
 // ClearObjectStoreParams clears all entries from an object store.
@@ -349,39 +200,7 @@ func ClearObjectStore(securityOrigin string, databaseName string, objectStoreNam
 // Do executes IndexedDB.clearObjectStore against the provided context and
 // target handler.
 func (p *ClearObjectStoreParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandIndexedDBClearObjectStore, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandIndexedDBClearObjectStore, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DeleteDatabaseParams deletes a database.
@@ -405,37 +224,5 @@ func DeleteDatabase(securityOrigin string, databaseName string) *DeleteDatabaseP
 // Do executes IndexedDB.deleteDatabase against the provided context and
 // target handler.
 func (p *DeleteDatabaseParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandIndexedDBDeleteDatabase, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandIndexedDBDeleteDatabase, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/input/input.go

@@ -10,7 +10,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // DispatchKeyEventParams dispatches a key event to the page.
@@ -126,39 +125,7 @@ func (p DispatchKeyEventParams) WithIsSystemKey(isSystemKey bool) *DispatchKeyEv
 // Do executes Input.dispatchKeyEvent against the provided context and
 // target handler.
 func (p *DispatchKeyEventParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandInputDispatchKeyEvent, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandInputDispatchKeyEvent, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DispatchMouseEventParams dispatches a mouse event to the page.
@@ -215,39 +182,7 @@ func (p DispatchMouseEventParams) WithClickCount(clickCount int64) *DispatchMous
 // Do executes Input.dispatchMouseEvent against the provided context and
 // target handler.
 func (p *DispatchMouseEventParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandInputDispatchMouseEvent, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandInputDispatchMouseEvent, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DispatchTouchEventParams dispatches a touch event to the page.
@@ -287,39 +222,7 @@ func (p DispatchTouchEventParams) WithTimestamp(timestamp float64) *DispatchTouc
 // Do executes Input.dispatchTouchEvent against the provided context and
 // target handler.
 func (p *DispatchTouchEventParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandInputDispatchTouchEvent, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandInputDispatchTouchEvent, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // EmulateTouchFromMouseEventParams emulates touch event from the mouse event
@@ -383,39 +286,7 @@ func (p EmulateTouchFromMouseEventParams) WithClickCount(clickCount int64) *Emul
 // Do executes Input.emulateTouchFromMouseEvent against the provided context and
 // target handler.
 func (p *EmulateTouchFromMouseEventParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandInputEmulateTouchFromMouseEvent, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandInputEmulateTouchFromMouseEvent, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SynthesizePinchGestureParams synthesizes a pinch gesture over a time
@@ -460,39 +331,7 @@ func (p SynthesizePinchGestureParams) WithGestureSourceType(gestureSourceType Ge
 // Do executes Input.synthesizePinchGesture against the provided context and
 // target handler.
 func (p *SynthesizePinchGestureParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandInputSynthesizePinchGesture, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandInputSynthesizePinchGesture, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SynthesizeScrollGestureParams synthesizes a scroll gesture over a time
@@ -595,39 +434,7 @@ func (p SynthesizeScrollGestureParams) WithInteractionMarkerName(interactionMark
 // Do executes Input.synthesizeScrollGesture against the provided context and
 // target handler.
 func (p *SynthesizeScrollGestureParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandInputSynthesizeScrollGesture, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandInputSynthesizeScrollGesture, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SynthesizeTapGestureParams synthesizes a tap gesture over a time period by
@@ -677,37 +484,5 @@ func (p SynthesizeTapGestureParams) WithGestureSourceType(gestureSourceType Gest
 // Do executes Input.synthesizeTapGesture against the provided context and
 // target handler.
 func (p *SynthesizeTapGestureParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandInputSynthesizeTapGesture, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandInputSynthesizeTapGesture, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/inspector/easyjson.go

@@ -17,7 +17,7 @@ var (
 	_ easyjson.Marshaler
 )
 
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector(in *jlexer.Lexer, out *EventTargetCrashed) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector(in *jlexer.Lexer, out *DisableParams) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -46,7 +46,125 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector(in *jlexer.Lexer, ou
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector(out *jwriter.Writer, in EventTargetCrashed) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector(out *jwriter.Writer, in DisableParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v DisableParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v DisableParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *DisableParams) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *DisableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector1(in *jlexer.Lexer, out *EnableParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector1(out *jwriter.Writer, in EnableParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v EnableParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector1(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v EnableParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector1(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *EnableParams) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector1(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *EnableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector1(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector2(in *jlexer.Lexer, out *EventTargetCrashed) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector2(out *jwriter.Writer, in EventTargetCrashed) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -56,27 +174,27 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector(out *jwriter.Writer,
 // MarshalJSON supports json.Marshaler interface
 func (v EventTargetCrashed) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector2(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v EventTargetCrashed) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector2(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *EventTargetCrashed) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector(&r, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector2(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
 func (v *EventTargetCrashed) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector(l, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector2(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector1(in *jlexer.Lexer, out *EventDetached) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector3(in *jlexer.Lexer, out *EventDetached) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -107,7 +225,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector1(in *jlexer.Lexer, o
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector1(out *jwriter.Writer, in EventDetached) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector3(out *jwriter.Writer, in EventDetached) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -124,142 +242,24 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector1(out *jwriter.Writer
 
 // MarshalJSON supports json.Marshaler interface
 func (v EventDetached) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector1(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v EventDetached) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector1(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *EventDetached) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector1(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *EventDetached) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector1(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector2(in *jlexer.Lexer, out *EnableParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector2(out *jwriter.Writer, in EnableParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v EnableParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector2(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v EnableParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector2(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *EnableParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector2(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *EnableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector2(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector3(in *jlexer.Lexer, out *DisableParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector3(out *jwriter.Writer, in DisableParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v DisableParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector3(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v DisableParams) MarshalEasyJSON(w *jwriter.Writer) {
+func (v EventDetached) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpInspector3(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *DisableParams) UnmarshalJSON(data []byte) error {
+func (v *EventDetached) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector3(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *DisableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *EventDetached) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpInspector3(l, v)
 }

cdp/inspector/inspector.go

@@ -10,7 +10,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // EnableParams enables inspector domain notifications.
@@ -24,33 +23,7 @@ func Enable() *EnableParams {
 // Do executes Inspector.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandInspectorEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandInspectorEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams disables inspector domain notifications.
@@ -64,31 +37,5 @@ func Disable() *DisableParams {
 // Do executes Inspector.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandInspectorDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandInspectorDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/io/easyjson.go

@@ -17,7 +17,74 @@ var (
 	_ easyjson.Marshaler
 )
 
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo(in *jlexer.Lexer, out *ReadReturns) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo(in *jlexer.Lexer, out *CloseParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "handle":
+			out.Handle = StreamHandle(in.String())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo(out *jwriter.Writer, in CloseParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if !first {
+		out.RawByte(',')
+	}
+	first = false
+	out.RawString("\"handle\":")
+	out.String(string(in.Handle))
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v CloseParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v CloseParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *CloseParams) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *CloseParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo1(in *jlexer.Lexer, out *ReadReturns) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -50,7 +117,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo(in *jlexer.Lexer, out *Read
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo(out *jwriter.Writer, in ReadReturns) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo1(out *jwriter.Writer, in ReadReturns) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -76,27 +143,27 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo(out *jwriter.Writer, in Rea
 // MarshalJSON supports json.Marshaler interface
 func (v ReadReturns) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo1(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v ReadReturns) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo1(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *ReadReturns) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo(&r, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo1(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
 func (v *ReadReturns) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo(l, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo1(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo1(in *jlexer.Lexer, out *ReadParams) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo2(in *jlexer.Lexer, out *ReadParams) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -131,7 +198,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo1(in *jlexer.Lexer, out *Rea
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo1(out *jwriter.Writer, in ReadParams) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo2(out *jwriter.Writer, in ReadParams) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -162,91 +229,24 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo1(out *jwriter.Writer, in Re
 
 // MarshalJSON supports json.Marshaler interface
 func (v ReadParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo1(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v ReadParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo1(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *ReadParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo1(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *ReadParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo1(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo2(in *jlexer.Lexer, out *CloseParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "handle":
-			out.Handle = StreamHandle(in.String())
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo2(out *jwriter.Writer, in CloseParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if !first {
-		out.RawByte(',')
-	}
-	first = false
-	out.RawString("\"handle\":")
-	out.String(string(in.Handle))
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v CloseParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo2(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v CloseParams) MarshalEasyJSON(w *jwriter.Writer) {
+func (v ReadParams) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpIo2(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *CloseParams) UnmarshalJSON(data []byte) error {
+func (v *ReadParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo2(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *CloseParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *ReadParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpIo2(l, v)
 }

cdp/io/io.go

@@ -12,7 +12,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // ReadParams read a chunk of the stream.
@@ -59,46 +58,14 @@ type ReadReturns struct {
 //   data - Data that were read.
 //   eof - Set if the end-of-file condition occured while reading.
 func (p *ReadParams) Do(ctxt context.Context, h cdp.Handler) (data string, eof bool, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res ReadReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandIORead, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return "", false, err
 	}
 
-	// execute
+	return res.Data, res.EOF, nil
-	ch := h.Execute(ctxt, cdp.CommandIORead, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return "", false, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r ReadReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return "", false, cdp.ErrInvalidResult
-			}
-
-			return r.Data, r.EOF, nil
-
-		case error:
-			return "", false, v
-		}
-
-	case <-ctxt.Done():
-		return "", false, ctxt.Err()
-	}
-
-	return "", false, cdp.ErrUnknownResult
 }
 
 // CloseParams close the stream, discard any temporary backing storage.
@@ -119,37 +86,5 @@ func Close(handle StreamHandle) *CloseParams {
 // Do executes IO.close against the provided context and
 // target handler.
 func (p *CloseParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandIOClose, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandIOClose, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/layertree/layertree.go

@@ -25,33 +25,7 @@ func Enable() *EnableParams {
 // Do executes LayerTree.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandLayerTreeEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandLayerTreeEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams disables compositing tree inspection.
@@ -65,33 +39,7 @@ func Disable() *DisableParams {
 // Do executes LayerTree.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandLayerTreeDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandLayerTreeDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // CompositingReasonsParams provides the reasons why the given layer was
@@ -122,46 +70,14 @@ type CompositingReasonsReturns struct {
 // returns:
 //   compositingReasons - A list of strings specifying reasons for the given layer to become composited.
 func (p *CompositingReasonsParams) Do(ctxt context.Context, h cdp.Handler) (compositingReasons []string, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res CompositingReasonsReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandLayerTreeCompositingReasons, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.CompositingReasons, nil
-	ch := h.Execute(ctxt, cdp.CommandLayerTreeCompositingReasons, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r CompositingReasonsReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.CompositingReasons, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // MakeSnapshotParams returns the layer snapshot identifier.
@@ -190,46 +106,14 @@ type MakeSnapshotReturns struct {
 // returns:
 //   snapshotID - The id of the layer snapshot.
 func (p *MakeSnapshotParams) Do(ctxt context.Context, h cdp.Handler) (snapshotID SnapshotID, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res MakeSnapshotReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandLayerTreeMakeSnapshot, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return "", err
 	}
 
-	// execute
+	return res.SnapshotID, nil
-	ch := h.Execute(ctxt, cdp.CommandLayerTreeMakeSnapshot, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return "", cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r MakeSnapshotReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return "", cdp.ErrInvalidResult
-			}
-
-			return r.SnapshotID, nil
-
-		case error:
-			return "", v
-		}
-
-	case <-ctxt.Done():
-		return "", ctxt.Err()
-	}
-
-	return "", cdp.ErrUnknownResult
 }
 
 // LoadSnapshotParams returns the snapshot identifier.
@@ -258,46 +142,14 @@ type LoadSnapshotReturns struct {
 // returns:
 //   snapshotID - The id of the snapshot.
 func (p *LoadSnapshotParams) Do(ctxt context.Context, h cdp.Handler) (snapshotID SnapshotID, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res LoadSnapshotReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandLayerTreeLoadSnapshot, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return "", err
 	}
 
-	// execute
+	return res.SnapshotID, nil
-	ch := h.Execute(ctxt, cdp.CommandLayerTreeLoadSnapshot, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return "", cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r LoadSnapshotReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return "", cdp.ErrInvalidResult
-			}
-
-			return r.SnapshotID, nil
-
-		case error:
-			return "", v
-		}
-
-	case <-ctxt.Done():
-		return "", ctxt.Err()
-	}
-
-	return "", cdp.ErrUnknownResult
 }
 
 // ReleaseSnapshotParams releases layer snapshot captured by the back-end.
@@ -318,39 +170,7 @@ func ReleaseSnapshot(snapshotID SnapshotID) *ReleaseSnapshotParams {
 // Do executes LayerTree.releaseSnapshot against the provided context and
 // target handler.
 func (p *ReleaseSnapshotParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandLayerTreeReleaseSnapshot, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandLayerTreeReleaseSnapshot, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ProfileSnapshotParams [no description].
@@ -401,46 +221,14 @@ type ProfileSnapshotReturns struct {
 // returns:
 //   timings - The array of paint profiles, one per run.
 func (p *ProfileSnapshotParams) Do(ctxt context.Context, h cdp.Handler) (timings []PaintProfile, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res ProfileSnapshotReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandLayerTreeProfileSnapshot, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.Timings, nil
-	ch := h.Execute(ctxt, cdp.CommandLayerTreeProfileSnapshot, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r ProfileSnapshotReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.Timings, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // ReplaySnapshotParams replays the layer snapshot and returns the resulting
@@ -494,46 +282,14 @@ type ReplaySnapshotReturns struct {
 // returns:
 //   dataURL - A data: URL for resulting image.
 func (p *ReplaySnapshotParams) Do(ctxt context.Context, h cdp.Handler) (dataURL string, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res ReplaySnapshotReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandLayerTreeReplaySnapshot, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return "", err
 	}
 
-	// execute
+	return res.DataURL, nil
-	ch := h.Execute(ctxt, cdp.CommandLayerTreeReplaySnapshot, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return "", cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r ReplaySnapshotReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return "", cdp.ErrInvalidResult
-			}
-
-			return r.DataURL, nil
-
-		case error:
-			return "", v
-		}
-
-	case <-ctxt.Done():
-		return "", ctxt.Err()
-	}
-
-	return "", cdp.ErrUnknownResult
 }
 
 // SnapshotCommandLogParams replays the layer snapshot and returns canvas
@@ -563,44 +319,12 @@ type SnapshotCommandLogReturns struct {
 // returns:
 //   commandLog - The array of canvas function calls.
 func (p *SnapshotCommandLogParams) Do(ctxt context.Context, h cdp.Handler) (commandLog []easyjson.RawMessage, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res SnapshotCommandLogReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandLayerTreeSnapshotCommandLog, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.CommandLog, nil
-	ch := h.Execute(ctxt, cdp.CommandLayerTreeSnapshotCommandLog, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r SnapshotCommandLogReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.CommandLog, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }

cdp/log/easyjson.go

@@ -19,86 +19,7 @@ var (
 	_ easyjson.Marshaler
 )
 
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog(in *jlexer.Lexer, out *ViolationSetting) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog(in *jlexer.Lexer, out *StopViolationsReportParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "name":
-			(out.Name).UnmarshalEasyJSON(in)
-		case "threshold":
-			out.Threshold = float64(in.Float64())
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog(out *jwriter.Writer, in ViolationSetting) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if in.Name != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"name\":")
-		(in.Name).MarshalEasyJSON(out)
-	}
-	if in.Threshold != 0 {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"threshold\":")
-		out.Float64(float64(in.Threshold))
-	}
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v ViolationSetting) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v ViolationSetting) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *ViolationSetting) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *ViolationSetting) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog1(in *jlexer.Lexer, out *StopViolationsReportParams) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -127,7 +48,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog1(in *jlexer.Lexer, out *St
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog1(out *jwriter.Writer, in StopViolationsReportParams) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog(out *jwriter.Writer, in StopViolationsReportParams) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -137,27 +58,27 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog1(out *jwriter.Writer, in S
 // MarshalJSON supports json.Marshaler interface
 func (v StopViolationsReportParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog1(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v StopViolationsReportParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog1(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *StopViolationsReportParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog1(&r, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
 func (v *StopViolationsReportParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog1(l, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog2(in *jlexer.Lexer, out *StartViolationsReportParams) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog1(in *jlexer.Lexer, out *StartViolationsReportParams) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -213,7 +134,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog2(in *jlexer.Lexer, out *St
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog2(out *jwriter.Writer, in StartViolationsReportParams) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog1(out *jwriter.Writer, in StartViolationsReportParams) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -244,27 +165,27 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog2(out *jwriter.Writer, in S
 // MarshalJSON supports json.Marshaler interface
 func (v StartViolationsReportParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog2(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog1(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v StartViolationsReportParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog2(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog1(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *StartViolationsReportParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog2(&r, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog1(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
 func (v *StartViolationsReportParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog2(l, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog1(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog3(in *jlexer.Lexer, out *EventEntryAdded) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog2(in *jlexer.Lexer, out *ClearParams) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -283,16 +204,6 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog3(in *jlexer.Lexer, out *Ev
 			continue
 		}
 		switch key {
-		case "entry":
-			if in.IsNull() {
-				in.Skip()
-				out.Entry = nil
-			} else {
-				if out.Entry == nil {
-					out.Entry = new(Entry)
-				}
-				(*out.Entry).UnmarshalEasyJSON(in)
-			}
 		default:
 			in.SkipRecursive()
 		}
@@ -303,49 +214,234 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog3(in *jlexer.Lexer, out *Ev
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog3(out *jwriter.Writer, in EventEntryAdded) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog2(out *jwriter.Writer, in ClearParams) {
 	out.RawByte('{')
 	first := true
 	_ = first
-	if in.Entry != nil {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"entry\":")
-		if in.Entry == nil {
-			out.RawString("null")
-		} else {
-			(*in.Entry).MarshalEasyJSON(out)
-		}
-	}
 	out.RawByte('}')
 }
 
 // MarshalJSON supports json.Marshaler interface
-func (v EventEntryAdded) MarshalJSON() ([]byte, error) {
+func (v ClearParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog2(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v ClearParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog2(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *ClearParams) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog2(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *ClearParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog2(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog3(in *jlexer.Lexer, out *DisableParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog3(out *jwriter.Writer, in DisableParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v DisableParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog3(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v EventEntryAdded) MarshalEasyJSON(w *jwriter.Writer) {
+func (v DisableParams) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog3(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *EventEntryAdded) UnmarshalJSON(data []byte) error {
+func (v *DisableParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog3(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *EventEntryAdded) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *DisableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog3(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog4(in *jlexer.Lexer, out *Entry) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog4(in *jlexer.Lexer, out *EnableParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog4(out *jwriter.Writer, in EnableParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v EnableParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog4(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v EnableParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog4(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *EnableParams) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog4(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *EnableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog4(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog5(in *jlexer.Lexer, out *ViolationSetting) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "name":
+			(out.Name).UnmarshalEasyJSON(in)
+		case "threshold":
+			out.Threshold = float64(in.Float64())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog5(out *jwriter.Writer, in ViolationSetting) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if in.Name != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"name\":")
+		(in.Name).MarshalEasyJSON(out)
+	}
+	if in.Threshold != 0 {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"threshold\":")
+		out.Float64(float64(in.Threshold))
+	}
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v ViolationSetting) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog5(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v ViolationSetting) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog5(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *ViolationSetting) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog5(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *ViolationSetting) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog5(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog6(in *jlexer.Lexer, out *Entry) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -400,7 +496,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog4(in *jlexer.Lexer, out *En
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog4(out *jwriter.Writer, in Entry) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog6(out *jwriter.Writer, in Entry) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -485,146 +581,28 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog4(out *jwriter.Writer, in E
 
 // MarshalJSON supports json.Marshaler interface
 func (v Entry) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog4(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v Entry) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog4(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *Entry) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog4(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *Entry) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog4(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog5(in *jlexer.Lexer, out *EnableParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog5(out *jwriter.Writer, in EnableParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v EnableParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog5(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v EnableParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog5(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *EnableParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog5(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *EnableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog5(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog6(in *jlexer.Lexer, out *DisableParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog6(out *jwriter.Writer, in DisableParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v DisableParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog6(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v DisableParams) MarshalEasyJSON(w *jwriter.Writer) {
+func (v Entry) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog6(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *DisableParams) UnmarshalJSON(data []byte) error {
+func (v *Entry) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog6(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *DisableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *Entry) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog6(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog7(in *jlexer.Lexer, out *ClearParams) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog7(in *jlexer.Lexer, out *EventEntryAdded) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -643,6 +621,16 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog7(in *jlexer.Lexer, out *Cl
 			continue
 		}
 		switch key {
+		case "entry":
+			if in.IsNull() {
+				in.Skip()
+				out.Entry = nil
+			} else {
+				if out.Entry == nil {
+					out.Entry = new(Entry)
+				}
+				(*out.Entry).UnmarshalEasyJSON(in)
+			}
 		default:
 			in.SkipRecursive()
 		}
@@ -653,33 +641,45 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog7(in *jlexer.Lexer, out *Cl
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog7(out *jwriter.Writer, in ClearParams) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog7(out *jwriter.Writer, in EventEntryAdded) {
 	out.RawByte('{')
 	first := true
 	_ = first
+	if in.Entry != nil {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"entry\":")
+		if in.Entry == nil {
+			out.RawString("null")
+		} else {
+			(*in.Entry).MarshalEasyJSON(out)
+		}
+	}
 	out.RawByte('}')
 }
 
 // MarshalJSON supports json.Marshaler interface
-func (v ClearParams) MarshalJSON() ([]byte, error) {
+func (v EventEntryAdded) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog7(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v ClearParams) MarshalEasyJSON(w *jwriter.Writer) {
+func (v EventEntryAdded) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpLog7(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *ClearParams) UnmarshalJSON(data []byte) error {
+func (v *EventEntryAdded) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog7(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *ClearParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *EventEntryAdded) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpLog7(l, v)
 }

cdp/log/log.go

@@ -12,7 +12,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // EnableParams enables log domain, sends the entries collected so far to the
@@ -28,33 +27,7 @@ func Enable() *EnableParams {
 // Do executes Log.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandLogEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandLogEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams disables log domain, prevents further log entries from being
@@ -70,33 +43,7 @@ func Disable() *DisableParams {
 // Do executes Log.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandLogDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandLogDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ClearParams clears the log.
@@ -110,33 +57,7 @@ func Clear() *ClearParams {
 // Do executes Log.clear against the provided context and
 // target handler.
 func (p *ClearParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandLogClear, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandLogClear, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // StartViolationsReportParams start violation reporting.
@@ -157,39 +78,7 @@ func StartViolationsReport(config []*ViolationSetting) *StartViolationsReportPar
 // Do executes Log.startViolationsReport against the provided context and
 // target handler.
 func (p *StartViolationsReportParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandLogStartViolationsReport, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandLogStartViolationsReport, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // StopViolationsReportParams stop violation reporting.
@@ -203,31 +92,5 @@ func StopViolationsReport() *StopViolationsReportParams {
 // Do executes Log.stopViolationsReport against the provided context and
 // target handler.
 func (p *StopViolationsReportParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandLogStopViolationsReport, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandLogStopViolationsReport, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/memory/memory.go

@@ -10,7 +10,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // GetDOMCountersParams [no description].
@@ -36,40 +35,14 @@ type GetDOMCountersReturns struct {
 //   nodes
 //   jsEventListeners
 func (p *GetDOMCountersParams) Do(ctxt context.Context, h cdp.Handler) (documents int64, nodes int64, jsEventListeners int64, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandMemoryGetDOMCounters, cdp.Empty)
+	var res GetDOMCountersReturns
-
+	err = h.Execute(ctxt, cdp.CommandMemoryGetDOMCounters, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return 0, 0, 0, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetDOMCountersReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return 0, 0, 0, cdp.ErrInvalidResult
+		return 0, 0, 0, err
 	}
 
-			return r.Documents, r.Nodes, r.JsEventListeners, nil
+	return res.Documents, res.Nodes, res.JsEventListeners, nil
-
-		case error:
-			return 0, 0, 0, v
-		}
-
-	case <-ctxt.Done():
-		return 0, 0, 0, ctxt.Err()
-	}
-
-	return 0, 0, 0, cdp.ErrUnknownResult
 }
 
 // SetPressureNotificationsSuppressedParams enable/disable suppressing memory
@@ -92,39 +65,7 @@ func SetPressureNotificationsSuppressed(suppressed bool) *SetPressureNotificatio
 // Do executes Memory.setPressureNotificationsSuppressed against the provided context and
 // target handler.
 func (p *SetPressureNotificationsSuppressedParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandMemorySetPressureNotificationsSuppressed, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandMemorySetPressureNotificationsSuppressed, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SimulatePressureNotificationParams simulate a memory pressure notification
@@ -147,37 +88,5 @@ func SimulatePressureNotification(level PressureLevel) *SimulatePressureNotifica
 // Do executes Memory.simulatePressureNotification against the provided context and
 // target handler.
 func (p *SimulatePressureNotificationParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandMemorySimulatePressureNotification, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandMemorySimulatePressureNotification, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/network/network.go

@@ -15,7 +15,6 @@ import (
 	"encoding/base64"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // EnableParams enables network tracking, network events will now be
@@ -50,39 +49,7 @@ func (p EnableParams) WithMaxResourceBufferSize(maxResourceBufferSize int64) *En
 // Do executes Network.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkEnable, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkEnable, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams disables network tracking, prevents network events from
@@ -98,33 +65,7 @@ func Disable() *DisableParams {
 // Do executes Network.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetUserAgentOverrideParams allows overriding user agent with the given
@@ -146,39 +87,7 @@ func SetUserAgentOverride(userAgent string) *SetUserAgentOverrideParams {
 // Do executes Network.setUserAgentOverride against the provided context and
 // target handler.
 func (p *SetUserAgentOverrideParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkSetUserAgentOverride, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkSetUserAgentOverride, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetExtraHTTPHeadersParams specifies whether to always send extra HTTP
@@ -201,39 +110,7 @@ func SetExtraHTTPHeaders(headers *Headers) *SetExtraHTTPHeadersParams {
 // Do executes Network.setExtraHTTPHeaders against the provided context and
 // target handler.
 func (p *SetExtraHTTPHeadersParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkSetExtraHTTPHeaders, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkSetExtraHTTPHeaders, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetResponseBodyParams returns content served for the given request.
@@ -263,57 +140,24 @@ type GetResponseBodyReturns struct {
 // returns:
 //   body - Response body.
 func (p *GetResponseBodyParams) Do(ctxt context.Context, h cdp.Handler) (body []byte, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetResponseBodyReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandNetworkGetResponseBody, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkGetResponseBody, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetResponseBodyReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
 	// decode
 	var dec []byte
-			if r.Base64encoded {
+	if res.Base64encoded {
-				dec, err = base64.StdEncoding.DecodeString(r.Body)
+		dec, err = base64.StdEncoding.DecodeString(res.Body)
 		if err != nil {
 			return nil, err
 		}
 	} else {
-				dec = []byte(r.Body)
+		dec = []byte(res.Body)
 	}
-
 	return dec, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // AddBlockedURLParams blocks specific URL from loading.
@@ -334,39 +178,7 @@ func AddBlockedURL(url string) *AddBlockedURLParams {
 // Do executes Network.addBlockedURL against the provided context and
 // target handler.
 func (p *AddBlockedURLParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkAddBlockedURL, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkAddBlockedURL, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // RemoveBlockedURLParams cancels blocking of a specific URL from loading.
@@ -387,39 +199,7 @@ func RemoveBlockedURL(url string) *RemoveBlockedURLParams {
 // Do executes Network.removeBlockedURL against the provided context and
 // target handler.
 func (p *RemoveBlockedURLParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkRemoveBlockedURL, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkRemoveBlockedURL, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ReplayXHRParams this method sends a new XMLHttpRequest which is identical
@@ -446,39 +226,7 @@ func ReplayXHR(requestID RequestID) *ReplayXHRParams {
 // Do executes Network.replayXHR against the provided context and
 // target handler.
 func (p *ReplayXHRParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkReplayXHR, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkReplayXHR, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetMonitoringXHREnabledParams toggles monitoring of XMLHttpRequest. If
@@ -501,39 +249,7 @@ func SetMonitoringXHREnabled(enabled bool) *SetMonitoringXHREnabledParams {
 // Do executes Network.setMonitoringXHREnabled against the provided context and
 // target handler.
 func (p *SetMonitoringXHREnabledParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkSetMonitoringXHREnabled, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkSetMonitoringXHREnabled, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // CanClearBrowserCacheParams tells whether clearing browser cache is
@@ -556,40 +272,14 @@ type CanClearBrowserCacheReturns struct {
 // returns:
 //   result - True if browser cache can be cleared.
 func (p *CanClearBrowserCacheParams) Do(ctxt context.Context, h cdp.Handler) (result bool, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkCanClearBrowserCache, cdp.Empty)
+	var res CanClearBrowserCacheReturns
-
+	err = h.Execute(ctxt, cdp.CommandNetworkCanClearBrowserCache, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return false, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r CanClearBrowserCacheReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return false, cdp.ErrInvalidResult
+		return false, err
 	}
 
-			return r.Result, nil
+	return res.Result, nil
-
-		case error:
-			return false, v
-		}
-
-	case <-ctxt.Done():
-		return false, ctxt.Err()
-	}
-
-	return false, cdp.ErrUnknownResult
 }
 
 // ClearBrowserCacheParams clears browser cache.
@@ -603,33 +293,7 @@ func ClearBrowserCache() *ClearBrowserCacheParams {
 // Do executes Network.clearBrowserCache against the provided context and
 // target handler.
 func (p *ClearBrowserCacheParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkClearBrowserCache, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkClearBrowserCache, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // CanClearBrowserCookiesParams tells whether clearing browser cookies is
@@ -653,40 +317,14 @@ type CanClearBrowserCookiesReturns struct {
 // returns:
 //   result - True if browser cookies can be cleared.
 func (p *CanClearBrowserCookiesParams) Do(ctxt context.Context, h cdp.Handler) (result bool, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkCanClearBrowserCookies, cdp.Empty)
+	var res CanClearBrowserCookiesReturns
-
+	err = h.Execute(ctxt, cdp.CommandNetworkCanClearBrowserCookies, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return false, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r CanClearBrowserCookiesReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return false, cdp.ErrInvalidResult
+		return false, err
 	}
 
-			return r.Result, nil
+	return res.Result, nil
-
-		case error:
-			return false, v
-		}
-
-	case <-ctxt.Done():
-		return false, ctxt.Err()
-	}
-
-	return false, cdp.ErrUnknownResult
 }
 
 // ClearBrowserCookiesParams clears browser cookies.
@@ -700,33 +338,7 @@ func ClearBrowserCookies() *ClearBrowserCookiesParams {
 // Do executes Network.clearBrowserCookies against the provided context and
 // target handler.
 func (p *ClearBrowserCookiesParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkClearBrowserCookies, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkClearBrowserCookies, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetCookiesParams returns all browser cookies for the current URL.
@@ -762,46 +374,14 @@ type GetCookiesReturns struct {
 // returns:
 //   cookies - Array of cookie objects.
 func (p *GetCookiesParams) Do(ctxt context.Context, h cdp.Handler) (cookies []*Cookie, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetCookiesReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandNetworkGetCookies, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.Cookies, nil
-	ch := h.Execute(ctxt, cdp.CommandNetworkGetCookies, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetCookiesReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.Cookies, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // GetAllCookiesParams returns all browser cookies. Depending on the backend
@@ -825,40 +405,14 @@ type GetAllCookiesReturns struct {
 // returns:
 //   cookies - Array of cookie objects.
 func (p *GetAllCookiesParams) Do(ctxt context.Context, h cdp.Handler) (cookies []*Cookie, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkGetAllCookies, cdp.Empty)
+	var res GetAllCookiesReturns
-
+	err = h.Execute(ctxt, cdp.CommandNetworkGetAllCookies, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetAllCookiesReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return nil, cdp.ErrInvalidResult
+		return nil, err
 	}
 
-			return r.Cookies, nil
+	return res.Cookies, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // DeleteCookieParams deletes browser cookie with given name, domain and
@@ -883,39 +437,7 @@ func DeleteCookie(cookieName string, url string) *DeleteCookieParams {
 // Do executes Network.deleteCookie against the provided context and
 // target handler.
 func (p *DeleteCookieParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkDeleteCookie, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkDeleteCookie, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetCookieParams sets a cookie with the given cookie data; may overwrite
@@ -994,46 +516,14 @@ type SetCookieReturns struct {
 // returns:
 //   success - True if successfully set cookie.
 func (p *SetCookieParams) Do(ctxt context.Context, h cdp.Handler) (success bool, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res SetCookieReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandNetworkSetCookie, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return false, err
 	}
 
-	// execute
+	return res.Success, nil
-	ch := h.Execute(ctxt, cdp.CommandNetworkSetCookie, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return false, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r SetCookieReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return false, cdp.ErrInvalidResult
-			}
-
-			return r.Success, nil
-
-		case error:
-			return false, v
-		}
-
-	case <-ctxt.Done():
-		return false, ctxt.Err()
-	}
-
-	return false, cdp.ErrUnknownResult
 }
 
 // CanEmulateNetworkConditionsParams tells whether emulation of network
@@ -1057,40 +547,14 @@ type CanEmulateNetworkConditionsReturns struct {
 // returns:
 //   result - True if emulation of network conditions is supported.
 func (p *CanEmulateNetworkConditionsParams) Do(ctxt context.Context, h cdp.Handler) (result bool, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkCanEmulateNetworkConditions, cdp.Empty)
+	var res CanEmulateNetworkConditionsReturns
-
+	err = h.Execute(ctxt, cdp.CommandNetworkCanEmulateNetworkConditions, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return false, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r CanEmulateNetworkConditionsReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return false, cdp.ErrInvalidResult
+		return false, err
 	}
 
-			return r.Result, nil
+	return res.Result, nil
-
-		case error:
-			return false, v
-		}
-
-	case <-ctxt.Done():
-		return false, ctxt.Err()
-	}
-
-	return false, cdp.ErrUnknownResult
 }
 
 // EmulateNetworkConditionsParams activates emulation of network conditions.
@@ -1127,39 +591,7 @@ func (p EmulateNetworkConditionsParams) WithConnectionType(connectionType Connec
 // Do executes Network.emulateNetworkConditions against the provided context and
 // target handler.
 func (p *EmulateNetworkConditionsParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkEmulateNetworkConditions, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkEmulateNetworkConditions, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetCacheDisabledParams toggles ignoring cache for each request. If true,
@@ -1182,39 +614,7 @@ func SetCacheDisabled(cacheDisabled bool) *SetCacheDisabledParams {
 // Do executes Network.setCacheDisabled against the provided context and
 // target handler.
 func (p *SetCacheDisabledParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkSetCacheDisabled, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkSetCacheDisabled, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetBypassServiceWorkerParams toggles ignoring of service worker for each
@@ -1237,39 +637,7 @@ func SetBypassServiceWorker(bypass bool) *SetBypassServiceWorkerParams {
 // Do executes Network.setBypassServiceWorker against the provided context and
 // target handler.
 func (p *SetBypassServiceWorkerParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkSetBypassServiceWorker, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkSetBypassServiceWorker, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetDataSizeLimitsForTestParams for testing.
@@ -1293,39 +661,7 @@ func SetDataSizeLimitsForTest(maxTotalSize int64, maxResourceSize int64) *SetDat
 // Do executes Network.setDataSizeLimitsForTest against the provided context and
 // target handler.
 func (p *SetDataSizeLimitsForTestParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandNetworkSetDataSizeLimitsForTest, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandNetworkSetDataSizeLimitsForTest, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetCertificateParams returns the DER-encoded certificate.
@@ -1354,44 +690,12 @@ type GetCertificateReturns struct {
 // returns:
 //   tableNames
 func (p *GetCertificateParams) Do(ctxt context.Context, h cdp.Handler) (tableNames []string, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetCertificateReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandNetworkGetCertificate, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.TableNames, nil
-	ch := h.Execute(ctxt, cdp.CommandNetworkGetCertificate, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetCertificateReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.TableNames, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }

cdp/profiler/profiler.go

@@ -10,7 +10,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // EnableParams [no description].
@@ -24,33 +23,7 @@ func Enable() *EnableParams {
 // Do executes Profiler.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandProfilerEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandProfilerEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams [no description].
@@ -64,33 +37,7 @@ func Disable() *DisableParams {
 // Do executes Profiler.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandProfilerDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandProfilerDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetSamplingIntervalParams changes CPU profiler sampling interval. Must be
@@ -113,39 +60,7 @@ func SetSamplingInterval(interval int64) *SetSamplingIntervalParams {
 // Do executes Profiler.setSamplingInterval against the provided context and
 // target handler.
 func (p *SetSamplingIntervalParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandProfilerSetSamplingInterval, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandProfilerSetSamplingInterval, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // StartParams [no description].
@@ -159,33 +74,7 @@ func Start() *StartParams {
 // Do executes Profiler.start against the provided context and
 // target handler.
 func (p *StartParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandProfilerStart, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandProfilerStart, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // StopParams [no description].
@@ -207,38 +96,12 @@ type StopReturns struct {
 // returns:
 //   profile - Recorded profile.
 func (p *StopParams) Do(ctxt context.Context, h cdp.Handler) (profile *Profile, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandProfilerStop, cdp.Empty)
+	var res StopReturns
-
+	err = h.Execute(ctxt, cdp.CommandProfilerStop, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r StopReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return nil, cdp.ErrInvalidResult
+		return nil, err
 	}
 
-			return r.Profile, nil
+	return res.Profile, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }

cdp/rendering/easyjson.go

@@ -151,7 +151,141 @@ func (v *SetShowScrollBottleneckRectsParams) UnmarshalJSON(data []byte) error {
 func (v *SetShowScrollBottleneckRectsParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering1(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering2(in *jlexer.Lexer, out *SetShowPaintRectsParams) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering2(in *jlexer.Lexer, out *SetShowFPSCounterParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "show":
+			out.Show = bool(in.Bool())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering2(out *jwriter.Writer, in SetShowFPSCounterParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if !first {
+		out.RawByte(',')
+	}
+	first = false
+	out.RawString("\"show\":")
+	out.Bool(bool(in.Show))
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v SetShowFPSCounterParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering2(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v SetShowFPSCounterParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering2(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *SetShowFPSCounterParams) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering2(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *SetShowFPSCounterParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering2(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering3(in *jlexer.Lexer, out *SetShowDebugBordersParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "show":
+			out.Show = bool(in.Bool())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering3(out *jwriter.Writer, in SetShowDebugBordersParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if !first {
+		out.RawByte(',')
+	}
+	first = false
+	out.RawString("\"show\":")
+	out.Bool(bool(in.Show))
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v SetShowDebugBordersParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering3(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v SetShowDebugBordersParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering3(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *SetShowDebugBordersParams) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering3(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *SetShowDebugBordersParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering3(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering4(in *jlexer.Lexer, out *SetShowPaintRectsParams) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -182,7 +316,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering2(in *jlexer.Lexer, o
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering2(out *jwriter.Writer, in SetShowPaintRectsParams) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering4(out *jwriter.Writer, in SetShowPaintRectsParams) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -197,158 +331,24 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering2(out *jwriter.Writer
 
 // MarshalJSON supports json.Marshaler interface
 func (v SetShowPaintRectsParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering2(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v SetShowPaintRectsParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering2(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *SetShowPaintRectsParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering2(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *SetShowPaintRectsParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering2(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering3(in *jlexer.Lexer, out *SetShowFPSCounterParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "show":
-			out.Show = bool(in.Bool())
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering3(out *jwriter.Writer, in SetShowFPSCounterParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if !first {
-		out.RawByte(',')
-	}
-	first = false
-	out.RawString("\"show\":")
-	out.Bool(bool(in.Show))
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v SetShowFPSCounterParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering3(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v SetShowFPSCounterParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering3(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *SetShowFPSCounterParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering3(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *SetShowFPSCounterParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering3(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering4(in *jlexer.Lexer, out *SetShowDebugBordersParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "show":
-			out.Show = bool(in.Bool())
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering4(out *jwriter.Writer, in SetShowDebugBordersParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if !first {
-		out.RawByte(',')
-	}
-	first = false
-	out.RawString("\"show\":")
-	out.Bool(bool(in.Show))
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v SetShowDebugBordersParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering4(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v SetShowDebugBordersParams) MarshalEasyJSON(w *jwriter.Writer) {
+func (v SetShowPaintRectsParams) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpRendering4(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *SetShowDebugBordersParams) UnmarshalJSON(data []byte) error {
+func (v *SetShowPaintRectsParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering4(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *SetShowDebugBordersParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *SetShowPaintRectsParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpRendering4(l, v)
 }

cdp/rendering/rendering.go

@@ -12,7 +12,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // SetShowPaintRectsParams requests that backend shows paint rectangles.
@@ -33,39 +32,7 @@ func SetShowPaintRects(result bool) *SetShowPaintRectsParams {
 // Do executes Rendering.setShowPaintRects against the provided context and
 // target handler.
 func (p *SetShowPaintRectsParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandRenderingSetShowPaintRects, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandRenderingSetShowPaintRects, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetShowDebugBordersParams requests that backend shows debug borders on
@@ -87,39 +54,7 @@ func SetShowDebugBorders(show bool) *SetShowDebugBordersParams {
 // Do executes Rendering.setShowDebugBorders against the provided context and
 // target handler.
 func (p *SetShowDebugBordersParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandRenderingSetShowDebugBorders, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandRenderingSetShowDebugBorders, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetShowFPSCounterParams requests that backend shows the FPS counter.
@@ -140,39 +75,7 @@ func SetShowFPSCounter(show bool) *SetShowFPSCounterParams {
 // Do executes Rendering.setShowFPSCounter against the provided context and
 // target handler.
 func (p *SetShowFPSCounterParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandRenderingSetShowFPSCounter, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandRenderingSetShowFPSCounter, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetShowScrollBottleneckRectsParams requests that backend shows scroll
@@ -195,39 +98,7 @@ func SetShowScrollBottleneckRects(show bool) *SetShowScrollBottleneckRectsParams
 // Do executes Rendering.setShowScrollBottleneckRects against the provided context and
 // target handler.
 func (p *SetShowScrollBottleneckRectsParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandRenderingSetShowScrollBottleneckRects, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandRenderingSetShowScrollBottleneckRects, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetShowViewportSizeOnResizeParams paints viewport size upon main frame
@@ -249,37 +120,5 @@ func SetShowViewportSizeOnResize(show bool) *SetShowViewportSizeOnResizeParams {
 // Do executes Rendering.setShowViewportSizeOnResize against the provided context and
 // target handler.
 func (p *SetShowViewportSizeOnResizeParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandRenderingSetShowViewportSizeOnResize, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandRenderingSetShowViewportSizeOnResize, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/runtime/runtime.go

@@ -17,7 +17,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // EvaluateParams evaluates expression on global object.
@@ -112,46 +111,14 @@ type EvaluateReturns struct {
 //   result - Evaluation result.
 //   exceptionDetails - Exception details.
 func (p *EvaluateParams) Do(ctxt context.Context, h cdp.Handler) (result *RemoteObject, exceptionDetails *ExceptionDetails, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res EvaluateReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandRuntimeEvaluate, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, nil, err
 	}
 
-	// execute
+	return res.Result, res.ExceptionDetails, nil
-	ch := h.Execute(ctxt, cdp.CommandRuntimeEvaluate, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r EvaluateReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, nil, cdp.ErrInvalidResult
-			}
-
-			return r.Result, r.ExceptionDetails, nil
-
-		case error:
-			return nil, nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, nil, ctxt.Err()
-	}
-
-	return nil, nil, cdp.ErrUnknownResult
 }
 
 // AwaitPromiseParams add handler to promise with given promise object id.
@@ -197,46 +164,14 @@ type AwaitPromiseReturns struct {
 //   result - Promise result. Will contain rejected value if promise was rejected.
 //   exceptionDetails - Exception details if stack strace is available.
 func (p *AwaitPromiseParams) Do(ctxt context.Context, h cdp.Handler) (result *RemoteObject, exceptionDetails *ExceptionDetails, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res AwaitPromiseReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandRuntimeAwaitPromise, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, nil, err
 	}
 
-	// execute
+	return res.Result, res.ExceptionDetails, nil
-	ch := h.Execute(ctxt, cdp.CommandRuntimeAwaitPromise, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r AwaitPromiseReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, nil, cdp.ErrInvalidResult
-			}
-
-			return r.Result, r.ExceptionDetails, nil
-
-		case error:
-			return nil, nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, nil, ctxt.Err()
-	}
-
-	return nil, nil, cdp.ErrUnknownResult
 }
 
 // CallFunctionOnParams calls function with given declaration on the given
@@ -319,46 +254,14 @@ type CallFunctionOnReturns struct {
 //   result - Call result.
 //   exceptionDetails - Exception details.
 func (p *CallFunctionOnParams) Do(ctxt context.Context, h cdp.Handler) (result *RemoteObject, exceptionDetails *ExceptionDetails, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res CallFunctionOnReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandRuntimeCallFunctionOn, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, nil, err
 	}
 
-	// execute
+	return res.Result, res.ExceptionDetails, nil
-	ch := h.Execute(ctxt, cdp.CommandRuntimeCallFunctionOn, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r CallFunctionOnReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, nil, cdp.ErrInvalidResult
-			}
-
-			return r.Result, r.ExceptionDetails, nil
-
-		case error:
-			return nil, nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, nil, ctxt.Err()
-	}
-
-	return nil, nil, cdp.ErrUnknownResult
 }
 
 // GetPropertiesParams returns properties of a given object. Object group of
@@ -416,46 +319,14 @@ type GetPropertiesReturns struct {
 //   internalProperties - Internal object properties (only of the element itself).
 //   exceptionDetails - Exception details.
 func (p *GetPropertiesParams) Do(ctxt context.Context, h cdp.Handler) (result []*PropertyDescriptor, internalProperties []*InternalPropertyDescriptor, exceptionDetails *ExceptionDetails, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetPropertiesReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandRuntimeGetProperties, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, nil, nil, err
 	}
 
-	// execute
+	return res.Result, res.InternalProperties, res.ExceptionDetails, nil
-	ch := h.Execute(ctxt, cdp.CommandRuntimeGetProperties, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, nil, nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetPropertiesReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, nil, nil, cdp.ErrInvalidResult
-			}
-
-			return r.Result, r.InternalProperties, r.ExceptionDetails, nil
-
-		case error:
-			return nil, nil, nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, nil, nil, ctxt.Err()
-	}
-
-	return nil, nil, nil, cdp.ErrUnknownResult
 }
 
 // ReleaseObjectParams releases remote object with given id.
@@ -476,39 +347,7 @@ func ReleaseObject(objectID RemoteObjectID) *ReleaseObjectParams {
 // Do executes Runtime.releaseObject against the provided context and
 // target handler.
 func (p *ReleaseObjectParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandRuntimeReleaseObject, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandRuntimeReleaseObject, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ReleaseObjectGroupParams releases all remote objects that belong to a
@@ -531,39 +370,7 @@ func ReleaseObjectGroup(objectGroup string) *ReleaseObjectGroupParams {
 // Do executes Runtime.releaseObjectGroup against the provided context and
 // target handler.
 func (p *ReleaseObjectGroupParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandRuntimeReleaseObjectGroup, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandRuntimeReleaseObjectGroup, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // RunIfWaitingForDebuggerParams tells inspected instance to run if it was
@@ -579,33 +386,7 @@ func RunIfWaitingForDebugger() *RunIfWaitingForDebuggerParams {
 // Do executes Runtime.runIfWaitingForDebugger against the provided context and
 // target handler.
 func (p *RunIfWaitingForDebuggerParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandRuntimeRunIfWaitingForDebugger, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandRuntimeRunIfWaitingForDebugger, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // EnableParams enables reporting of execution contexts creation by means of
@@ -623,33 +404,7 @@ func Enable() *EnableParams {
 // Do executes Runtime.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandRuntimeEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandRuntimeEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams disables reporting of execution contexts creation.
@@ -663,33 +418,7 @@ func Disable() *DisableParams {
 // Do executes Runtime.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandRuntimeDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandRuntimeDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DiscardConsoleEntriesParams discards collected exceptions and console API
@@ -704,33 +433,7 @@ func DiscardConsoleEntries() *DiscardConsoleEntriesParams {
 // Do executes Runtime.discardConsoleEntries against the provided context and
 // target handler.
 func (p *DiscardConsoleEntriesParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandRuntimeDiscardConsoleEntries, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandRuntimeDiscardConsoleEntries, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetCustomObjectFormatterEnabledParams [no description].
@@ -751,39 +454,7 @@ func SetCustomObjectFormatterEnabled(enabled bool) *SetCustomObjectFormatterEnab
 // Do executes Runtime.setCustomObjectFormatterEnabled against the provided context and
 // target handler.
 func (p *SetCustomObjectFormatterEnabledParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandRuntimeSetCustomObjectFormatterEnabled, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandRuntimeSetCustomObjectFormatterEnabled, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // CompileScriptParams compiles expression.
@@ -829,46 +500,14 @@ type CompileScriptReturns struct {
 //   scriptID - Id of the script.
 //   exceptionDetails - Exception details.
 func (p *CompileScriptParams) Do(ctxt context.Context, h cdp.Handler) (scriptID ScriptID, exceptionDetails *ExceptionDetails, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res CompileScriptReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandRuntimeCompileScript, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return "", nil, err
 	}
 
-	// execute
+	return res.ScriptID, res.ExceptionDetails, nil
-	ch := h.Execute(ctxt, cdp.CommandRuntimeCompileScript, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return "", nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r CompileScriptReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return "", nil, cdp.ErrInvalidResult
-			}
-
-			return r.ScriptID, r.ExceptionDetails, nil
-
-		case error:
-			return "", nil, v
-		}
-
-	case <-ctxt.Done():
-		return "", nil, ctxt.Err()
-	}
-
-	return "", nil, cdp.ErrUnknownResult
 }
 
 // RunScriptParams runs script with given id in a given context.
@@ -955,44 +594,12 @@ type RunScriptReturns struct {
 //   result - Run result.
 //   exceptionDetails - Exception details.
 func (p *RunScriptParams) Do(ctxt context.Context, h cdp.Handler) (result *RemoteObject, exceptionDetails *ExceptionDetails, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res RunScriptReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandRuntimeRunScript, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, nil, err
 	}
 
-	// execute
+	return res.Result, res.ExceptionDetails, nil
-	ch := h.Execute(ctxt, cdp.CommandRuntimeRunScript, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r RunScriptReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, nil, cdp.ErrInvalidResult
-			}
-
-			return r.Result, r.ExceptionDetails, nil
-
-		case error:
-			return nil, nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, nil, ctxt.Err()
-	}
-
-	return nil, nil, cdp.ErrUnknownResult
 }

cdp/schema/schema.go

@@ -12,7 +12,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // GetDomainsParams returns supported domains.
@@ -34,38 +33,12 @@ type GetDomainsReturns struct {
 // returns:
 //   domains - List of supported domains.
 func (p *GetDomainsParams) Do(ctxt context.Context, h cdp.Handler) (domains []*Domain, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandSchemaGetDomains, cdp.Empty)
+	var res GetDomainsReturns
-
+	err = h.Execute(ctxt, cdp.CommandSchemaGetDomains, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetDomainsReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return nil, cdp.ErrInvalidResult
+		return nil, err
 	}
 
-			return r.Domains, nil
+	return res.Domains, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }

cdp/security/easyjson.go

@@ -17,106 +17,7 @@ var (
 	_ easyjson.Marshaler
 )
 
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity(in *jlexer.Lexer, out *StateExplanation) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity(in *jlexer.Lexer, out *ShowCertificateViewerParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "securityState":
-			(out.SecurityState).UnmarshalEasyJSON(in)
-		case "summary":
-			out.Summary = string(in.String())
-		case "description":
-			out.Description = string(in.String())
-		case "hasCertificate":
-			out.HasCertificate = bool(in.Bool())
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity(out *jwriter.Writer, in StateExplanation) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if in.SecurityState != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"securityState\":")
-		(in.SecurityState).MarshalEasyJSON(out)
-	}
-	if in.Summary != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"summary\":")
-		out.String(string(in.Summary))
-	}
-	if in.Description != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"description\":")
-		out.String(string(in.Description))
-	}
-	if in.HasCertificate {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"hasCertificate\":")
-		out.Bool(bool(in.HasCertificate))
-	}
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v StateExplanation) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v StateExplanation) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *StateExplanation) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *StateExplanation) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity1(in *jlexer.Lexer, out *ShowCertificateViewerParams) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -145,7 +46,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity1(in *jlexer.Lexer, ou
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity1(out *jwriter.Writer, in ShowCertificateViewerParams) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity(out *jwriter.Writer, in ShowCertificateViewerParams) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -155,27 +56,145 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity1(out *jwriter.Writer,
 // MarshalJSON supports json.Marshaler interface
 func (v ShowCertificateViewerParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity1(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v ShowCertificateViewerParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity1(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *ShowCertificateViewerParams) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *ShowCertificateViewerParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity1(in *jlexer.Lexer, out *DisableParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity1(out *jwriter.Writer, in DisableParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v DisableParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity1(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v DisableParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity1(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *DisableParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity1(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *ShowCertificateViewerParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *DisableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity1(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity2(in *jlexer.Lexer, out *InsecureContentStatus) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity2(in *jlexer.Lexer, out *EnableParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity2(out *jwriter.Writer, in EnableParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v EnableParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity2(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v EnableParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity2(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *EnableParams) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity2(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *EnableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity2(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity3(in *jlexer.Lexer, out *InsecureContentStatus) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -216,7 +235,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity2(in *jlexer.Lexer, ou
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity2(out *jwriter.Writer, in InsecureContentStatus) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity3(out *jwriter.Writer, in InsecureContentStatus) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -274,27 +293,126 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity2(out *jwriter.Writer,
 // MarshalJSON supports json.Marshaler interface
 func (v InsecureContentStatus) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity2(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity3(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v InsecureContentStatus) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity2(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity3(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *InsecureContentStatus) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity2(&r, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity3(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
 func (v *InsecureContentStatus) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity2(l, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity3(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity3(in *jlexer.Lexer, out *EventSecurityStateChanged) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity4(in *jlexer.Lexer, out *StateExplanation) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "securityState":
+			(out.SecurityState).UnmarshalEasyJSON(in)
+		case "summary":
+			out.Summary = string(in.String())
+		case "description":
+			out.Description = string(in.String())
+		case "hasCertificate":
+			out.HasCertificate = bool(in.Bool())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity4(out *jwriter.Writer, in StateExplanation) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if in.SecurityState != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"securityState\":")
+		(in.SecurityState).MarshalEasyJSON(out)
+	}
+	if in.Summary != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"summary\":")
+		out.String(string(in.Summary))
+	}
+	if in.Description != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"description\":")
+		out.String(string(in.Description))
+	}
+	if in.HasCertificate {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"hasCertificate\":")
+		out.Bool(bool(in.HasCertificate))
+	}
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v StateExplanation) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity4(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v StateExplanation) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity4(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *StateExplanation) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity4(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *StateExplanation) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity4(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity5(in *jlexer.Lexer, out *EventSecurityStateChanged) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -366,7 +484,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity3(in *jlexer.Lexer, ou
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity3(out *jwriter.Writer, in EventSecurityStateChanged) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity5(out *jwriter.Writer, in EventSecurityStateChanged) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -434,142 +552,24 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity3(out *jwriter.Writer,
 
 // MarshalJSON supports json.Marshaler interface
 func (v EventSecurityStateChanged) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity3(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v EventSecurityStateChanged) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity3(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *EventSecurityStateChanged) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity3(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *EventSecurityStateChanged) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity3(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity4(in *jlexer.Lexer, out *EnableParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity4(out *jwriter.Writer, in EnableParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v EnableParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity4(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v EnableParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity4(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *EnableParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity4(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *EnableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity4(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity5(in *jlexer.Lexer, out *DisableParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity5(out *jwriter.Writer, in DisableParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v DisableParams) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity5(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
-func (v DisableParams) MarshalEasyJSON(w *jwriter.Writer) {
+func (v EventSecurityStateChanged) MarshalEasyJSON(w *jwriter.Writer) {
 	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSecurity5(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
-func (v *DisableParams) UnmarshalJSON(data []byte) error {
+func (v *EventSecurityStateChanged) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity5(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *DisableParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *EventSecurityStateChanged) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSecurity5(l, v)
 }

cdp/security/security.go

@@ -12,7 +12,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // EnableParams enables tracking security state changes.
@@ -26,33 +25,7 @@ func Enable() *EnableParams {
 // Do executes Security.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandSecurityEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandSecurityEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams disables tracking security state changes.
@@ -66,33 +39,7 @@ func Disable() *DisableParams {
 // Do executes Security.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandSecurityDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandSecurityDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // ShowCertificateViewerParams displays native dialog with the certificate
@@ -107,31 +54,5 @@ func ShowCertificateViewer() *ShowCertificateViewerParams {
 // Do executes Security.showCertificateViewer against the provided context and
 // target handler.
 func (p *ShowCertificateViewerParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandSecurityShowCertificateViewer, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandSecurityShowCertificateViewer, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/serviceworker/serviceworker.go

@@ -10,7 +10,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // EnableParams [no description].
@@ -24,33 +23,7 @@ func Enable() *EnableParams {
 // Do executes ServiceWorker.enable against the provided context and
 // target handler.
 func (p *EnableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandServiceWorkerEnable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandServiceWorkerEnable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DisableParams [no description].
@@ -64,33 +37,7 @@ func Disable() *DisableParams {
 // Do executes ServiceWorker.disable against the provided context and
 // target handler.
 func (p *DisableParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandServiceWorkerDisable, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandServiceWorkerDisable, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // UnregisterParams [no description].
@@ -111,39 +58,7 @@ func Unregister(scopeURL string) *UnregisterParams {
 // Do executes ServiceWorker.unregister against the provided context and
 // target handler.
 func (p *UnregisterParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandServiceWorkerUnregister, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandServiceWorkerUnregister, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // UpdateRegistrationParams [no description].
@@ -164,39 +79,7 @@ func UpdateRegistration(scopeURL string) *UpdateRegistrationParams {
 // Do executes ServiceWorker.updateRegistration against the provided context and
 // target handler.
 func (p *UpdateRegistrationParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandServiceWorkerUpdateRegistration, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandServiceWorkerUpdateRegistration, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // StartWorkerParams [no description].
@@ -217,39 +100,7 @@ func StartWorker(scopeURL string) *StartWorkerParams {
 // Do executes ServiceWorker.startWorker against the provided context and
 // target handler.
 func (p *StartWorkerParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandServiceWorkerStartWorker, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandServiceWorkerStartWorker, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SkipWaitingParams [no description].
@@ -270,39 +121,7 @@ func SkipWaiting(scopeURL string) *SkipWaitingParams {
 // Do executes ServiceWorker.skipWaiting against the provided context and
 // target handler.
 func (p *SkipWaitingParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandServiceWorkerSkipWaiting, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandServiceWorkerSkipWaiting, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // StopWorkerParams [no description].
@@ -323,39 +142,7 @@ func StopWorker(versionID string) *StopWorkerParams {
 // Do executes ServiceWorker.stopWorker against the provided context and
 // target handler.
 func (p *StopWorkerParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandServiceWorkerStopWorker, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandServiceWorkerStopWorker, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // InspectWorkerParams [no description].
@@ -376,39 +163,7 @@ func InspectWorker(versionID string) *InspectWorkerParams {
 // Do executes ServiceWorker.inspectWorker against the provided context and
 // target handler.
 func (p *InspectWorkerParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandServiceWorkerInspectWorker, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandServiceWorkerInspectWorker, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetForceUpdateOnPageLoadParams [no description].
@@ -429,39 +184,7 @@ func SetForceUpdateOnPageLoad(forceUpdateOnPageLoad bool) *SetForceUpdateOnPageL
 // Do executes ServiceWorker.setForceUpdateOnPageLoad against the provided context and
 // target handler.
 func (p *SetForceUpdateOnPageLoadParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandServiceWorkerSetForceUpdateOnPageLoad, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandServiceWorkerSetForceUpdateOnPageLoad, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DeliverPushMessageParams [no description].
@@ -488,39 +211,7 @@ func DeliverPushMessage(origin string, registrationID string, data string) *Deli
 // Do executes ServiceWorker.deliverPushMessage against the provided context and
 // target handler.
 func (p *DeliverPushMessageParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandServiceWorkerDeliverPushMessage, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandServiceWorkerDeliverPushMessage, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // DispatchSyncEventParams [no description].
@@ -550,37 +241,5 @@ func DispatchSyncEvent(origin string, registrationID string, tag string, lastCha
 // Do executes ServiceWorker.dispatchSyncEvent against the provided context and
 // target handler.
 func (p *DispatchSyncEventParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandServiceWorkerDispatchSyncEvent, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandServiceWorkerDispatchSyncEvent, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/storage/storage.go

@@ -10,7 +10,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // ClearDataForOriginParams clears storage for origin.
@@ -34,37 +33,5 @@ func ClearDataForOrigin(origin string, storageTypes string) *ClearDataForOriginP
 // Do executes Storage.clearDataForOrigin against the provided context and
 // target handler.
 func (p *ClearDataForOriginParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandStorageClearDataForOrigin, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandStorageClearDataForOrigin, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/systeminfo/easyjson.go

@@ -17,167 +17,7 @@ var (
 	_ easyjson.Marshaler
 )
 
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo(in *jlexer.Lexer, out *GetInfoReturns) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo(in *jlexer.Lexer, out *GPUInfo) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "gpu":
-			if in.IsNull() {
-				in.Skip()
-				out.Gpu = nil
-			} else {
-				if out.Gpu == nil {
-					out.Gpu = new(GPUInfo)
-				}
-				(*out.Gpu).UnmarshalEasyJSON(in)
-			}
-		case "modelName":
-			out.ModelName = string(in.String())
-		case "modelVersion":
-			out.ModelVersion = string(in.String())
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo(out *jwriter.Writer, in GetInfoReturns) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if in.Gpu != nil {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"gpu\":")
-		if in.Gpu == nil {
-			out.RawString("null")
-		} else {
-			(*in.Gpu).MarshalEasyJSON(out)
-		}
-	}
-	if in.ModelName != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"modelName\":")
-		out.String(string(in.ModelName))
-	}
-	if in.ModelVersion != "" {
-		if !first {
-			out.RawByte(',')
-		}
-		first = false
-		out.RawString("\"modelVersion\":")
-		out.String(string(in.ModelVersion))
-	}
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v GetInfoReturns) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v GetInfoReturns) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *GetInfoReturns) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *GetInfoReturns) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo1(in *jlexer.Lexer, out *GetInfoParams) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo1(out *jwriter.Writer, in GetInfoParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v GetInfoParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo1(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v GetInfoParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo1(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *GetInfoParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo1(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *GetInfoParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo1(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo2(in *jlexer.Lexer, out *GPUInfo) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -256,7 +96,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo2(in *jlexer.Lexer,
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo2(out *jwriter.Writer, in GPUInfo) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo(out *jwriter.Writer, in GPUInfo) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -324,27 +164,27 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo2(out *jwriter.Write
 // MarshalJSON supports json.Marshaler interface
 func (v GPUInfo) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo2(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v GPUInfo) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo2(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *GPUInfo) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo2(&r, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
 func (v *GPUInfo) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo2(l, v)
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo(l, v)
 }
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo3(in *jlexer.Lexer, out *GPUDevice) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo1(in *jlexer.Lexer, out *GPUDevice) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -381,7 +221,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo3(in *jlexer.Lexer,
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo3(out *jwriter.Writer, in GPUDevice) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo1(out *jwriter.Writer, in GPUDevice) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -423,23 +263,183 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo3(out *jwriter.Write
 // MarshalJSON supports json.Marshaler interface
 func (v GPUDevice) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo3(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo1(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v GPUDevice) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo3(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo1(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *GPUDevice) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo1(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *GPUDevice) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo1(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo2(in *jlexer.Lexer, out *GetInfoReturns) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "gpu":
+			if in.IsNull() {
+				in.Skip()
+				out.Gpu = nil
+			} else {
+				if out.Gpu == nil {
+					out.Gpu = new(GPUInfo)
+				}
+				(*out.Gpu).UnmarshalEasyJSON(in)
+			}
+		case "modelName":
+			out.ModelName = string(in.String())
+		case "modelVersion":
+			out.ModelVersion = string(in.String())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo2(out *jwriter.Writer, in GetInfoReturns) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if in.Gpu != nil {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"gpu\":")
+		if in.Gpu == nil {
+			out.RawString("null")
+		} else {
+			(*in.Gpu).MarshalEasyJSON(out)
+		}
+	}
+	if in.ModelName != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"modelName\":")
+		out.String(string(in.ModelName))
+	}
+	if in.ModelVersion != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"modelVersion\":")
+		out.String(string(in.ModelVersion))
+	}
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v GetInfoReturns) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo2(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v GetInfoReturns) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo2(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *GetInfoReturns) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo2(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *GetInfoReturns) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo2(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo3(in *jlexer.Lexer, out *GetInfoParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo3(out *jwriter.Writer, in GetInfoParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v GetInfoParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo3(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v GetInfoParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpSysteminfo3(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *GetInfoParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo3(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *GPUDevice) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *GetInfoParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpSysteminfo3(l, v)
 }

cdp/systeminfo/systeminfo.go

@@ -13,7 +13,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // GetInfoParams returns information about the system.
@@ -39,38 +38,12 @@ type GetInfoReturns struct {
 //   modelName - A platform-dependent description of the model of the machine. On Mac OS, this is, for example, 'MacBookPro'. Will be the empty string if not supported.
 //   modelVersion - A platform-dependent description of the version of the machine. On Mac OS, this is, for example, '10.1'. Will be the empty string if not supported.
 func (p *GetInfoParams) Do(ctxt context.Context, h cdp.Handler) (gpu *GPUInfo, modelName string, modelVersion string, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandSystemInfoGetInfo, cdp.Empty)
+	var res GetInfoReturns
-
+	err = h.Execute(ctxt, cdp.CommandSystemInfoGetInfo, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, "", "", cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetInfoReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return nil, "", "", cdp.ErrInvalidResult
+		return nil, "", "", err
 	}
 
-			return r.Gpu, r.ModelName, r.ModelVersion, nil
+	return res.Gpu, res.ModelName, res.ModelVersion, nil
-
-		case error:
-			return nil, "", "", v
-		}
-
-	case <-ctxt.Done():
-		return nil, "", "", ctxt.Err()
-	}
-
-	return nil, "", "", cdp.ErrUnknownResult
 }

cdp/target/target.go

@@ -12,7 +12,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // SetDiscoverTargetsParams controls whether to discover available targets
@@ -35,39 +34,7 @@ func SetDiscoverTargets(discover bool) *SetDiscoverTargetsParams {
 // Do executes Target.setDiscoverTargets against the provided context and
 // target handler.
 func (p *SetDiscoverTargetsParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandTargetSetDiscoverTargets, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandTargetSetDiscoverTargets, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetAutoAttachParams controls whether to automatically attach to new
@@ -97,39 +64,7 @@ func SetAutoAttach(autoAttach bool, waitForDebuggerOnStart bool) *SetAutoAttachP
 // Do executes Target.setAutoAttach against the provided context and
 // target handler.
 func (p *SetAutoAttachParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandTargetSetAutoAttach, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandTargetSetAutoAttach, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetAttachToFramesParams [no description].
@@ -150,39 +85,7 @@ func SetAttachToFrames(value bool) *SetAttachToFramesParams {
 // Do executes Target.setAttachToFrames against the provided context and
 // target handler.
 func (p *SetAttachToFramesParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandTargetSetAttachToFrames, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandTargetSetAttachToFrames, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SetRemoteLocationsParams enables target discovery for the specified
@@ -205,39 +108,7 @@ func SetRemoteLocations(locations []*RemoteLocation) *SetRemoteLocationsParams {
 // Do executes Target.setRemoteLocations against the provided context and
 // target handler.
 func (p *SetRemoteLocationsParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandTargetSetRemoteLocations, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandTargetSetRemoteLocations, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // SendMessageToTargetParams sends protocol message to the target with given
@@ -262,39 +133,7 @@ func SendMessageToTarget(targetID string, message string) *SendMessageToTargetPa
 // Do executes Target.sendMessageToTarget against the provided context and
 // target handler.
 func (p *SendMessageToTargetParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandTargetSendMessageToTarget, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandTargetSendMessageToTarget, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetTargetInfoParams returns information about a target.
@@ -323,46 +162,14 @@ type GetTargetInfoReturns struct {
 // returns:
 //   targetInfo
 func (p *GetTargetInfoParams) Do(ctxt context.Context, h cdp.Handler) (targetInfo *Info, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res GetTargetInfoReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandTargetGetTargetInfo, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return nil, err
 	}
 
-	// execute
+	return res.TargetInfo, nil
-	ch := h.Execute(ctxt, cdp.CommandTargetGetTargetInfo, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetTargetInfoReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return nil, cdp.ErrInvalidResult
-			}
-
-			return r.TargetInfo, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // ActivateTargetParams activates (focuses) the target.
@@ -383,39 +190,7 @@ func ActivateTarget(targetID ID) *ActivateTargetParams {
 // Do executes Target.activateTarget against the provided context and
 // target handler.
 func (p *ActivateTargetParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandTargetActivateTarget, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandTargetActivateTarget, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // CloseTargetParams closes the target. If the target is a page that gets
@@ -446,46 +221,14 @@ type CloseTargetReturns struct {
 // returns:
 //   success
 func (p *CloseTargetParams) Do(ctxt context.Context, h cdp.Handler) (success bool, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res CloseTargetReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandTargetCloseTarget, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return false, err
 	}
 
-	// execute
+	return res.Success, nil
-	ch := h.Execute(ctxt, cdp.CommandTargetCloseTarget, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return false, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r CloseTargetReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return false, cdp.ErrInvalidResult
-			}
-
-			return r.Success, nil
-
-		case error:
-			return false, v
-		}
-
-	case <-ctxt.Done():
-		return false, ctxt.Err()
-	}
-
-	return false, cdp.ErrUnknownResult
 }
 
 // AttachToTargetParams attaches to the target with given id.
@@ -514,46 +257,14 @@ type AttachToTargetReturns struct {
 // returns:
 //   success - Whether attach succeeded.
 func (p *AttachToTargetParams) Do(ctxt context.Context, h cdp.Handler) (success bool, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res AttachToTargetReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandTargetAttachToTarget, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return false, err
 	}
 
-	// execute
+	return res.Success, nil
-	ch := h.Execute(ctxt, cdp.CommandTargetAttachToTarget, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return false, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r AttachToTargetReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return false, cdp.ErrInvalidResult
-			}
-
-			return r.Success, nil
-
-		case error:
-			return false, v
-		}
-
-	case <-ctxt.Done():
-		return false, ctxt.Err()
-	}
-
-	return false, cdp.ErrUnknownResult
 }
 
 // DetachFromTargetParams detaches from the target with given id.
@@ -574,39 +285,7 @@ func DetachFromTarget(targetID ID) *DetachFromTargetParams {
 // Do executes Target.detachFromTarget against the provided context and
 // target handler.
 func (p *DetachFromTargetParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandTargetDetachFromTarget, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandTargetDetachFromTarget, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // CreateBrowserContextParams creates a new empty BrowserContext. Similar to
@@ -630,40 +309,14 @@ type CreateBrowserContextReturns struct {
 // returns:
 //   browserContextID - The id of the context created.
 func (p *CreateBrowserContextParams) Do(ctxt context.Context, h cdp.Handler) (browserContextID BrowserContextID, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandTargetCreateBrowserContext, cdp.Empty)
+	var res CreateBrowserContextReturns
-
+	err = h.Execute(ctxt, cdp.CommandTargetCreateBrowserContext, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return "", cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r CreateBrowserContextReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return "", cdp.ErrInvalidResult
+		return "", err
 	}
 
-			return r.BrowserContextID, nil
+	return res.BrowserContextID, nil
-
-		case error:
-			return "", v
-		}
-
-	case <-ctxt.Done():
-		return "", ctxt.Err()
-	}
-
-	return "", cdp.ErrUnknownResult
 }
 
 // DisposeBrowserContextParams deletes a BrowserContext, will fail of any
@@ -694,46 +347,14 @@ type DisposeBrowserContextReturns struct {
 // returns:
 //   success
 func (p *DisposeBrowserContextParams) Do(ctxt context.Context, h cdp.Handler) (success bool, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res DisposeBrowserContextReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandTargetDisposeBrowserContext, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return false, err
 	}
 
-	// execute
+	return res.Success, nil
-	ch := h.Execute(ctxt, cdp.CommandTargetDisposeBrowserContext, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return false, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r DisposeBrowserContextReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return false, cdp.ErrInvalidResult
-			}
-
-			return r.Success, nil
-
-		case error:
-			return false, v
-		}
-
-	case <-ctxt.Done():
-		return false, ctxt.Err()
-	}
-
-	return false, cdp.ErrUnknownResult
 }
 
 // CreateTargetParams creates a new page.
@@ -784,46 +405,14 @@ type CreateTargetReturns struct {
 // returns:
 //   targetID - The id of the page opened.
 func (p *CreateTargetParams) Do(ctxt context.Context, h cdp.Handler) (targetID ID, err error) {
-	if ctxt == nil {
+	// execute
-		ctxt = context.Background()
+	var res CreateTargetReturns
-	}
+	err = h.Execute(ctxt, cdp.CommandTargetCreateTarget, p, &res)
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return "", err
 	}
 
-	// execute
+	return res.TargetID, nil
-	ch := h.Execute(ctxt, cdp.CommandTargetCreateTarget, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return "", cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r CreateTargetReturns
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return "", cdp.ErrInvalidResult
-			}
-
-			return r.TargetID, nil
-
-		case error:
-			return "", v
-		}
-
-	case <-ctxt.Done():
-		return "", ctxt.Err()
-	}
-
-	return "", cdp.ErrUnknownResult
 }
 
 // GetTargetsParams retrieves a list of available targets.
@@ -845,38 +434,12 @@ type GetTargetsReturns struct {
 // returns:
 //   targetInfos - The list of targets.
 func (p *GetTargetsParams) Do(ctxt context.Context, h cdp.Handler) (targetInfos []*Info, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandTargetGetTargets, cdp.Empty)
+	var res GetTargetsReturns
-
+	err = h.Execute(ctxt, cdp.CommandTargetGetTargets, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetTargetsReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return nil, cdp.ErrInvalidResult
+		return nil, err
 	}
 
-			return r.TargetInfos, nil
+	return res.TargetInfos, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }

cdp/tethering/easyjson.go

@@ -17,74 +17,7 @@ var (
 	_ easyjson.Marshaler
 )
 
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpTethering(in *jlexer.Lexer, out *UnbindParams) {
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpTethering(in *jlexer.Lexer, out *EventAccepted) {
-	isTopLevel := in.IsStart()
-	if in.IsNull() {
-		if isTopLevel {
-			in.Consumed()
-		}
-		in.Skip()
-		return
-	}
-	in.Delim('{')
-	for !in.IsDelim('}') {
-		key := in.UnsafeString()
-		in.WantColon()
-		if in.IsNull() {
-			in.Skip()
-			in.WantComma()
-			continue
-		}
-		switch key {
-		case "port":
-			out.Port = int64(in.Int64())
-		default:
-			in.SkipRecursive()
-		}
-		in.WantComma()
-	}
-	in.Delim('}')
-	if isTopLevel {
-		in.Consumed()
-	}
-}
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering(out *jwriter.Writer, in UnbindParams) {
-	out.RawByte('{')
-	first := true
-	_ = first
-	if !first {
-		out.RawByte(',')
-	}
-	first = false
-	out.RawString("\"port\":")
-	out.Int64(int64(in.Port))
-	out.RawByte('}')
-}
-
-// MarshalJSON supports json.Marshaler interface
-func (v UnbindParams) MarshalJSON() ([]byte, error) {
-	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering(&w, v)
-	return w.Buffer.BuildBytes(), w.Error
-}
-
-// MarshalEasyJSON supports easyjson.Marshaler interface
-func (v UnbindParams) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering(w, v)
-}
-
-// UnmarshalJSON supports json.Unmarshaler interface
-func (v *UnbindParams) UnmarshalJSON(data []byte) error {
-	r := jlexer.Lexer{Data: data}
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpTethering(&r, v)
-	return r.Error()
-}
-
-// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *UnbindParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
-	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpTethering(l, v)
-}
-func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpTethering1(in *jlexer.Lexer, out *EventAccepted) {
 	isTopLevel := in.IsStart()
 	if in.IsNull() {
 		if isTopLevel {
@@ -117,7 +50,7 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpTethering1(in *jlexer.Lexer, o
 		in.Consumed()
 	}
 }
-func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering1(out *jwriter.Writer, in EventAccepted) {
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering(out *jwriter.Writer, in EventAccepted) {
 	out.RawByte('{')
 	first := true
 	_ = first
@@ -143,24 +76,91 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering1(out *jwriter.Writer
 // MarshalJSON supports json.Marshaler interface
 func (v EventAccepted) MarshalJSON() ([]byte, error) {
 	w := jwriter.Writer{}
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering1(&w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering(&w, v)
 	return w.Buffer.BuildBytes(), w.Error
 }
 
 // MarshalEasyJSON supports easyjson.Marshaler interface
 func (v EventAccepted) MarshalEasyJSON(w *jwriter.Writer) {
-	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering1(w, v)
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering(w, v)
 }
 
 // UnmarshalJSON supports json.Unmarshaler interface
 func (v *EventAccepted) UnmarshalJSON(data []byte) error {
+	r := jlexer.Lexer{Data: data}
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpTethering(&r, v)
+	return r.Error()
+}
+
+// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
+func (v *EventAccepted) UnmarshalEasyJSON(l *jlexer.Lexer) {
+	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpTethering(l, v)
+}
+func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpTethering1(in *jlexer.Lexer, out *UnbindParams) {
+	isTopLevel := in.IsStart()
+	if in.IsNull() {
+		if isTopLevel {
+			in.Consumed()
+		}
+		in.Skip()
+		return
+	}
+	in.Delim('{')
+	for !in.IsDelim('}') {
+		key := in.UnsafeString()
+		in.WantColon()
+		if in.IsNull() {
+			in.Skip()
+			in.WantComma()
+			continue
+		}
+		switch key {
+		case "port":
+			out.Port = int64(in.Int64())
+		default:
+			in.SkipRecursive()
+		}
+		in.WantComma()
+	}
+	in.Delim('}')
+	if isTopLevel {
+		in.Consumed()
+	}
+}
+func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering1(out *jwriter.Writer, in UnbindParams) {
+	out.RawByte('{')
+	first := true
+	_ = first
+	if !first {
+		out.RawByte(',')
+	}
+	first = false
+	out.RawString("\"port\":")
+	out.Int64(int64(in.Port))
+	out.RawByte('}')
+}
+
+// MarshalJSON supports json.Marshaler interface
+func (v UnbindParams) MarshalJSON() ([]byte, error) {
+	w := jwriter.Writer{}
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering1(&w, v)
+	return w.Buffer.BuildBytes(), w.Error
+}
+
+// MarshalEasyJSON supports easyjson.Marshaler interface
+func (v UnbindParams) MarshalEasyJSON(w *jwriter.Writer) {
+	easyjsonC5a4559bEncodeGithubComKnqChromedpCdpTethering1(w, v)
+}
+
+// UnmarshalJSON supports json.Unmarshaler interface
+func (v *UnbindParams) UnmarshalJSON(data []byte) error {
 	r := jlexer.Lexer{Data: data}
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpTethering1(&r, v)
 	return r.Error()
 }
 
 // UnmarshalEasyJSON supports easyjson.Unmarshaler interface
-func (v *EventAccepted) UnmarshalEasyJSON(l *jlexer.Lexer) {
+func (v *UnbindParams) UnmarshalEasyJSON(l *jlexer.Lexer) {
 	easyjsonC5a4559bDecodeGithubComKnqChromedpCdpTethering1(l, v)
 }
 func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpTethering2(in *jlexer.Lexer, out *BindParams) {

cdp/tethering/tethering.go

@@ -12,7 +12,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // BindParams request browser port binding.
@@ -33,39 +32,7 @@ func Bind(port int64) *BindParams {
 // Do executes Tethering.bind against the provided context and
 // target handler.
 func (p *BindParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandTetheringBind, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandTetheringBind, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // UnbindParams request browser port unbinding.
@@ -86,37 +53,5 @@ func Unbind(port int64) *UnbindParams {
 // Do executes Tethering.unbind against the provided context and
 // target handler.
 func (p *UnbindParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandTetheringUnbind, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandTetheringUnbind, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

cdp/tracing/tracing.go

@@ -10,7 +10,6 @@ import (
 	"context"
 
 	cdp "github.com/knq/chromedp/cdp"
-	"github.com/mailru/easyjson"
 )
 
 // StartParams start trace events collection.
@@ -50,39 +49,7 @@ func (p StartParams) WithTraceConfig(traceConfig *TraceConfig) *StartParams {
 // Do executes Tracing.start against the provided context and
 // target handler.
 func (p *StartParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandTracingStart, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandTracingStart, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // EndParams stop trace events collection.
@@ -96,33 +63,7 @@ func End() *EndParams {
 // Do executes Tracing.end against the provided context and
 // target handler.
 func (p *EndParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandTracingEnd, nil, nil)
-		ctxt = context.Background()
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandTracingEnd, cdp.Empty)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }
 
 // GetCategoriesParams gets supported tracing categories.
@@ -144,40 +85,14 @@ type GetCategoriesReturns struct {
 // returns:
 //   categories - A list of supported tracing categories.
 func (p *GetCategoriesParams) Do(ctxt context.Context, h cdp.Handler) (categories []string, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandTracingGetCategories, cdp.Empty)
+	var res GetCategoriesReturns
-
+	err = h.Execute(ctxt, cdp.CommandTracingGetCategories, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return nil, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r GetCategoriesReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return nil, cdp.ErrInvalidResult
+		return nil, err
 	}
 
-			return r.Categories, nil
+	return res.Categories, nil
-
-		case error:
-			return nil, v
-		}
-
-	case <-ctxt.Done():
-		return nil, ctxt.Err()
-	}
-
-	return nil, cdp.ErrUnknownResult
 }
 
 // RequestMemoryDumpParams request a global memory dump.
@@ -201,40 +116,14 @@ type RequestMemoryDumpReturns struct {
 //   dumpGUID - GUID of the resulting global memory dump.
 //   success - True iff the global memory dump succeeded.
 func (p *RequestMemoryDumpParams) Do(ctxt context.Context, h cdp.Handler) (dumpGUID string, success bool, err error) {
-	if ctxt == nil {
-		ctxt = context.Background()
-	}
-
 	// execute
-	ch := h.Execute(ctxt, cdp.CommandTracingRequestMemoryDump, cdp.Empty)
+	var res RequestMemoryDumpReturns
-
+	err = h.Execute(ctxt, cdp.CommandTracingRequestMemoryDump, nil, &res)
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return "", false, cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			// unmarshal
-			var r RequestMemoryDumpReturns
-			err = easyjson.Unmarshal(v, &r)
 	if err != nil {
-				return "", false, cdp.ErrInvalidResult
+		return "", false, err
 	}
 
-			return r.DumpGUID, r.Success, nil
+	return res.DumpGUID, res.Success, nil
-
-		case error:
-			return "", false, v
-		}
-
-	case <-ctxt.Done():
-		return "", false, ctxt.Err()
-	}
-
-	return "", false, cdp.ErrUnknownResult
 }
 
 // RecordClockSyncMarkerParams record a clock sync marker in the trace.
@@ -255,37 +144,5 @@ func RecordClockSyncMarker(syncID string) *RecordClockSyncMarkerParams {
 // Do executes Tracing.recordClockSyncMarker against the provided context and
 // target handler.
 func (p *RecordClockSyncMarkerParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.CommandTracingRecordClockSyncMarker, p, nil)
-		ctxt = context.Background()
-	}
-
-	// marshal
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return err
-	}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.CommandTracingRecordClockSyncMarker, easyjson.RawMessage(buf))
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:
-			return nil
-
-		case error:
-			return v
-		}
-
-	case <-ctxt.Done():
-		return ctxt.Err()
-	}
-
-	return cdp.ErrUnknownResult
 }

chromedp_test.go

@@ -15,7 +15,7 @@ var defaultContext = context.Background()
 func TestMain(m *testing.M) {
 	var err error
 
-	pool, err = NewPool()
+	pool, err = NewPool(PoolLog(log.Printf, log.Printf, log.Printf))
 	if err != nil {
 		log.Fatal(err)
 	}

cmd/chromedp-gen/internal/types.go

@@ -360,8 +360,8 @@ func (t *Type) EmptyRetList(d *Domain, domains []*Domain) string {
 	return strings.TrimSuffix(s, ", ")
 }
 
-// RetValueList returns the return value list for a command.
+// RetNameList returns a <valname>.<name> list for a command's return list.
-func (t *Type) RetValueList(d *Domain, domains []*Domain) string {
+func (t *Type) RetNameList(valname string, d *Domain, domains []*Domain) string {
 	var s string
 	b64ret := t.Base64EncodedRetParam()
 	for _, p := range t.Returns {
@@ -369,7 +369,7 @@ func (t *Type) RetValueList(d *Domain, domains []*Domain) string {
 			continue
 		}
 
-		n := "r." + p.GoName(false)
+		n := valname + "." + p.GoName(false)
 		if b64ret != nil && b64ret.Name == p.Name {
 			n = "dec"
 		}

cmd/chromedp-gen/protocol.json

@@ -7174,12 +7174,6 @@
               "optional": true,
               "description": "Event original handler function value."
             },
-            {
-              "name": "removeFunction",
-              "$ref": "Runtime.RemoteObject",
-              "optional": true,
-              "description": "Event listener remove function."
-            },
             {
               "name": "backendNodeId",
               "$ref": "DOM.BackendNodeId",

cmd/chromedp-gen/templates/domain.qtpl

@@ -86,7 +86,7 @@ func (p {%s= typ %}) {%s= optName %}({%s= v %} {%s= t.GoType(d, domains) %}) *{%
 		retTypeList += ", "
 	}
 
-	retValueList := c.RetValueList(d, domains)
+	retValueList := c.RetNameList("res", d, domains)
 	if retValueList != "" {
 		retValueList += ", "
 	}
@@ -102,63 +102,36 @@ func (p {%s= typ %}) {%s= optName %}({%s= v %} {%s= t.GoType(d, domains) %}) *{%
 			break
 		}
 	}
+
+	pval := "p"
+	if hasEmptyParams {
+		pval = "nil"
+	}
 %}
 // Do executes {%s= c.ProtoName(d) %} against the provided context and
-// target handler.{% if len(c.Returns) > 0 %}
+// target handler.{% if !hasEmptyRet %}
 //
 // returns:{% for _, p := range c.Returns %}{% if p.Name == internal.Base64EncodedParamName %}{% continue %}{% end %}
 //   {%s= p.String() %}{% endfor %}{% endif %}
-func (p *{%s= typ %}) Do(ctxt context.Context, h cdp.Handler) ({%s= retTypeList %}err error) {
+func (p *{%s= typ %}) Do(ctxt context.Context, h cdp.Handler) ({%s= retTypeList %}err error) {{% if hasEmptyRet %}
-	if ctxt == nil {
+	return h.Execute(ctxt, cdp.{%s= c.CommandMethodType(d) %}, {%s= pval %}, nil){% else %}
-		ctxt = context.Background()
+	// execute
-	}{% if !hasEmptyParams %}
+	var res {%s= c.CommandReturnsType() %}
-
+	err = h.Execute(ctxt, cdp.{%s= c.CommandMethodType(d) %}, {%s= pval %}, &res)
-	// marshal
-	buf, err := easyjson.Marshal(p)
 	if err != nil {
 		return {%s= emptyRet %}err
-	}{% endif %}
-
-	// execute
-	ch := h.Execute(ctxt, cdp.{%s= c.CommandMethodType(d) %}, {% if hasEmptyParams %}cdp.Empty{% else %}easyjson.RawMessage(buf){% end %})
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return {%s= emptyRet %}cdp.ErrChannelClosed
 	}
-
+	{% if b64ret != nil %}
-		switch v := res.(type) {
-		case easyjson.RawMessage:{% if !hasEmptyRet %}
-			// unmarshal
-			var r {%s= c.CommandReturnsType() %}
-			err = easyjson.Unmarshal(v, &r)
-			if err != nil {
-				return {%s= emptyRet %}cdp.ErrInvalidResult
-			}{% if b64ret != nil %}
-
 	// decode
 	var dec []byte{% if b64cond %}
-			if r.Base64encoded {{% endif %}
+	if res.Base64encoded {{% endif %}
-				dec, err = base64.StdEncoding.DecodeString(r.{%s= b64ret.GoName(false) %})
+		dec, err = base64.StdEncoding.DecodeString(res.{%s= b64ret.GoName(false) %})
 		if err != nil {
 			return nil, err
 		}{% if b64cond %}
 	} else {
-				dec = []byte(r.{%s= b64ret.GoName(false) %})
+		dec = []byte(res.{%s= b64ret.GoName(false) %})
 	}{% endif %}{% endif %}
-			{% endif %}
+	return {%s= retValueList %}nil{% endif %}
-			return {%s= retValueList %}nil
-
-		case error:
-			return {%s= emptyRet %}v
-		}
-
-	case <-ctxt.Done():
-		return {%s= emptyRet %}ctxt.Err()
-	}
-
-	return {%s= emptyRet %}cdp.ErrUnknownResult
 }
 {% endfunc %}

cmd/chromedp-gen/templates/domain.qtpl.go

@@ -424,7 +424,7 @@ func StreamCommandDoFuncTemplate(qw422016 *qt422016.Writer, c *internal.Type, d
 		retTypeList += ", "
 	}
 
-	retValueList := c.RetValueList(d, domains)
+	retValueList := c.RetNameList("res", d, domains)
 	if retValueList != "" {
 		retValueList += ", "
 	}
@@ -441,220 +441,169 @@ func StreamCommandDoFuncTemplate(qw422016 *qt422016.Writer, c *internal.Type, d
 		}
 	}
 
-	//line templates/domain.qtpl:105
+	pval := "p"
+	if hasEmptyParams {
+		pval = "nil"
+	}
+
+	//line templates/domain.qtpl:110
 	qw422016.N().S(`
 // Do executes `)
-	//line templates/domain.qtpl:106
+	//line templates/domain.qtpl:111
 	qw422016.N().S(c.ProtoName(d))
-	//line templates/domain.qtpl:106
+	//line templates/domain.qtpl:111
 	qw422016.N().S(` against the provided context and
 // target handler.`)
-	//line templates/domain.qtpl:107
+	//line templates/domain.qtpl:112
-	if len(c.Returns) > 0 {
+	if !hasEmptyRet {
-		//line templates/domain.qtpl:107
+		//line templates/domain.qtpl:112
 		qw422016.N().S(`
 //
 // returns:`)
-		//line templates/domain.qtpl:109
+		//line templates/domain.qtpl:114
 		for _, p := range c.Returns {
-			//line templates/domain.qtpl:109
+			//line templates/domain.qtpl:114
 			if p.Name == internal.Base64EncodedParamName {
-				//line templates/domain.qtpl:109
+				//line templates/domain.qtpl:114
 				continue
-				//line templates/domain.qtpl:109
+				//line templates/domain.qtpl:114
 			}
-			//line templates/domain.qtpl:109
+			//line templates/domain.qtpl:114
 			qw422016.N().S(`
 //   `)
-			//line templates/domain.qtpl:110
+			//line templates/domain.qtpl:115
 			qw422016.N().S(p.String())
-			//line templates/domain.qtpl:110
+			//line templates/domain.qtpl:115
 		}
-		//line templates/domain.qtpl:110
+		//line templates/domain.qtpl:115
 	}
-	//line templates/domain.qtpl:110
+	//line templates/domain.qtpl:115
 	qw422016.N().S(`
 func (p *`)
-	//line templates/domain.qtpl:111
+	//line templates/domain.qtpl:116
 	qw422016.N().S(typ)
-	//line templates/domain.qtpl:111
+	//line templates/domain.qtpl:116
 	qw422016.N().S(`) Do(ctxt context.Context, h cdp.Handler) (`)
-	//line templates/domain.qtpl:111
+	//line templates/domain.qtpl:116
 	qw422016.N().S(retTypeList)
-	//line templates/domain.qtpl:111
+	//line templates/domain.qtpl:116
-	qw422016.N().S(`err error) {
+	qw422016.N().S(`err error) {`)
-	if ctxt == nil {
+	//line templates/domain.qtpl:116
-		ctxt = context.Background()
+	if hasEmptyRet {
-	}`)
+		//line templates/domain.qtpl:116
-	//line templates/domain.qtpl:114
-	if !hasEmptyParams {
-		//line templates/domain.qtpl:114
 		qw422016.N().S(`
-
+	return h.Execute(ctxt, cdp.`)
-	// marshal
+		//line templates/domain.qtpl:117
-	buf, err := easyjson.Marshal(p)
-	if err != nil {
-		return `)
-		//line templates/domain.qtpl:119
-		qw422016.N().S(emptyRet)
-		//line templates/domain.qtpl:119
-		qw422016.N().S(`err
-	}`)
-		//line templates/domain.qtpl:120
-	}
-	//line templates/domain.qtpl:120
-	qw422016.N().S(`
-
-	// execute
-	ch := h.Execute(ctxt, cdp.`)
-	//line templates/domain.qtpl:123
 		qw422016.N().S(c.CommandMethodType(d))
-	//line templates/domain.qtpl:123
+		//line templates/domain.qtpl:117
 		qw422016.N().S(`, `)
-	//line templates/domain.qtpl:123
+		//line templates/domain.qtpl:117
-	if hasEmptyParams {
+		qw422016.N().S(pval)
-		//line templates/domain.qtpl:123
+		//line templates/domain.qtpl:117
-		qw422016.N().S(`cdp.Empty`)
+		qw422016.N().S(`, nil)`)
-		//line templates/domain.qtpl:123
+		//line templates/domain.qtpl:117
 	} else {
-		//line templates/domain.qtpl:123
+		//line templates/domain.qtpl:117
-		qw422016.N().S(`easyjson.RawMessage(buf)`)
-		//line templates/domain.qtpl:123
-	}
-	//line templates/domain.qtpl:123
-	qw422016.N().S(`)
-
-	// read response
-	select {
-	case res := <-ch:
-		if res == nil {
-			return `)
-	//line templates/domain.qtpl:129
-	qw422016.N().S(emptyRet)
-	//line templates/domain.qtpl:129
-	qw422016.N().S(`cdp.ErrChannelClosed
-		}
-
-		switch v := res.(type) {
-		case easyjson.RawMessage:`)
-	//line templates/domain.qtpl:133
-	if !hasEmptyRet {
-		//line templates/domain.qtpl:133
 		qw422016.N().S(`
-			// unmarshal
+	// execute
-			var r `)
+	var res `)
-		//line templates/domain.qtpl:135
+		//line templates/domain.qtpl:119
 		qw422016.N().S(c.CommandReturnsType())
-		//line templates/domain.qtpl:135
+		//line templates/domain.qtpl:119
 		qw422016.N().S(`
-			err = easyjson.Unmarshal(v, &r)
+	err = h.Execute(ctxt, cdp.`)
+		//line templates/domain.qtpl:120
+		qw422016.N().S(c.CommandMethodType(d))
+		//line templates/domain.qtpl:120
+		qw422016.N().S(`, `)
+		//line templates/domain.qtpl:120
+		qw422016.N().S(pval)
+		//line templates/domain.qtpl:120
+		qw422016.N().S(`, &res)
 	if err != nil {
 		return `)
-		//line templates/domain.qtpl:138
+		//line templates/domain.qtpl:122
 		qw422016.N().S(emptyRet)
-		//line templates/domain.qtpl:138
+		//line templates/domain.qtpl:122
-		qw422016.N().S(`cdp.ErrInvalidResult
+		qw422016.N().S(`err
-			}`)
+	}
-		//line templates/domain.qtpl:139
+	`)
+		//line templates/domain.qtpl:124
 		if b64ret != nil {
-			//line templates/domain.qtpl:139
+			//line templates/domain.qtpl:124
 			qw422016.N().S(`
-
 	// decode
 	var dec []byte`)
-			//line templates/domain.qtpl:142
+			//line templates/domain.qtpl:126
 			if b64cond {
-				//line templates/domain.qtpl:142
+				//line templates/domain.qtpl:126
 				qw422016.N().S(`
-			if r.Base64encoded {`)
+	if res.Base64encoded {`)
-				//line templates/domain.qtpl:143
+				//line templates/domain.qtpl:127
 			}
-			//line templates/domain.qtpl:143
+			//line templates/domain.qtpl:127
 			qw422016.N().S(`
-				dec, err = base64.StdEncoding.DecodeString(r.`)
+		dec, err = base64.StdEncoding.DecodeString(res.`)
-			//line templates/domain.qtpl:144
+			//line templates/domain.qtpl:128
 			qw422016.N().S(b64ret.GoName(false))
-			//line templates/domain.qtpl:144
+			//line templates/domain.qtpl:128
 			qw422016.N().S(`)
 		if err != nil {
 			return nil, err
 		}`)
-			//line templates/domain.qtpl:147
+			//line templates/domain.qtpl:131
 			if b64cond {
-				//line templates/domain.qtpl:147
+				//line templates/domain.qtpl:131
 				qw422016.N().S(`
 	} else {
-				dec = []byte(r.`)
+		dec = []byte(res.`)
-				//line templates/domain.qtpl:149
+				//line templates/domain.qtpl:133
 				qw422016.N().S(b64ret.GoName(false))
-				//line templates/domain.qtpl:149
+				//line templates/domain.qtpl:133
 				qw422016.N().S(`)
 	}`)
-				//line templates/domain.qtpl:150
+				//line templates/domain.qtpl:134
 			}
-			//line templates/domain.qtpl:150
+			//line templates/domain.qtpl:134
 		}
-		//line templates/domain.qtpl:150
+		//line templates/domain.qtpl:134
-		qw422016.N().S(`
-			`)
-		//line templates/domain.qtpl:151
-	}
-	//line templates/domain.qtpl:151
 		qw422016.N().S(`
 	return `)
-	//line templates/domain.qtpl:152
+		//line templates/domain.qtpl:135
 		qw422016.N().S(retValueList)
-	//line templates/domain.qtpl:152
+		//line templates/domain.qtpl:135
-	qw422016.N().S(`nil
+		qw422016.N().S(`nil`)
-
+		//line templates/domain.qtpl:135
-		case error:
-			return `)
-	//line templates/domain.qtpl:155
-	qw422016.N().S(emptyRet)
-	//line templates/domain.qtpl:155
-	qw422016.N().S(`v
 	}
-
+	//line templates/domain.qtpl:135
-	case <-ctxt.Done():
+	qw422016.N().S(`
-		return `)
-	//line templates/domain.qtpl:159
-	qw422016.N().S(emptyRet)
-	//line templates/domain.qtpl:159
-	qw422016.N().S(`ctxt.Err()
-	}
-
-	return `)
-	//line templates/domain.qtpl:162
-	qw422016.N().S(emptyRet)
-	//line templates/domain.qtpl:162
-	qw422016.N().S(`cdp.ErrUnknownResult
 }
 `)
-//line templates/domain.qtpl:164
+//line templates/domain.qtpl:137
 }
 
-//line templates/domain.qtpl:164
+//line templates/domain.qtpl:137
 func WriteCommandDoFuncTemplate(qq422016 qtio422016.Writer, c *internal.Type, d *internal.Domain, domains []*internal.Domain) {
-	//line templates/domain.qtpl:164
+	//line templates/domain.qtpl:137
 	qw422016 := qt422016.AcquireWriter(qq422016)
-	//line templates/domain.qtpl:164
+	//line templates/domain.qtpl:137
 	StreamCommandDoFuncTemplate(qw422016, c, d, domains)
-	//line templates/domain.qtpl:164
+	//line templates/domain.qtpl:137
 	qt422016.ReleaseWriter(qw422016)
-//line templates/domain.qtpl:164
+//line templates/domain.qtpl:137
 }
 
-//line templates/domain.qtpl:164
+//line templates/domain.qtpl:137
 func CommandDoFuncTemplate(c *internal.Type, d *internal.Domain, domains []*internal.Domain) string {
-	//line templates/domain.qtpl:164
+	//line templates/domain.qtpl:137
 	qb422016 := qt422016.AcquireByteBuffer()
-	//line templates/domain.qtpl:164
+	//line templates/domain.qtpl:137
 	WriteCommandDoFuncTemplate(qb422016, c, d, domains)
-	//line templates/domain.qtpl:164
+	//line templates/domain.qtpl:137
 	qs422016 := string(qb422016.B)
-	//line templates/domain.qtpl:164
+	//line templates/domain.qtpl:137
 	qt422016.ReleaseByteBuffer(qb422016)
-	//line templates/domain.qtpl:164
+	//line templates/domain.qtpl:137
 	return qs422016
-//line templates/domain.qtpl:164
+//line templates/domain.qtpl:137
 }

cmd/chromedp-gen/templates/extra.qtpl

@@ -231,7 +231,7 @@ type Handler interface {
 
 	// Execute executes the specified command using the supplied context and
 	// parameters.
-	Execute(context.Context, MethodType, easyjson.RawMessage) <-chan interface{}
+	Execute(context.Context, MethodType, easyjson.Marshaler, easyjson.Unmarshaler) error
 
 	// Listen creates a channel that will receive an event for the types
 	// specified.
@@ -240,9 +240,6 @@ type Handler interface {
 	// Release releases a channel returned from Listen.
 	Release(<-chan interface{})
 }
-
-// Empty is an empty JSON object message.
-var Empty = easyjson.RawMessage(`{}`)
 {% endfunc %}
 
 // ExtraUtilTemplate generates the decode func for the Message type.

cmd/chromedp-gen/templates/extra.qtpl.go

@@ -492,7 +492,7 @@ type Handler interface {
 
 	// Execute executes the specified command using the supplied context and
 	// parameters.
-	Execute(context.Context, MethodType, easyjson.RawMessage) <-chan interface{}
+	Execute(context.Context, MethodType, easyjson.Marshaler, easyjson.Unmarshaler) error
 
 	// Listen creates a channel that will receive an event for the types
 	// specified.
@@ -501,52 +501,41 @@ type Handler interface {
 	// Release releases a channel returned from Listen.
 	Release(<-chan interface{})
 }
-
-// Empty is an empty JSON object message.
-var Empty = easyjson.RawMessage(`)
-	//line templates/extra.qtpl:211
-	qw422016.N().S("`")
-	//line templates/extra.qtpl:211
-	qw422016.N().S(`{}`)
-	//line templates/extra.qtpl:211
-	qw422016.N().S("`")
-	//line templates/extra.qtpl:211
-	qw422016.N().S(`)
 `)
-//line templates/extra.qtpl:246
+//line templates/extra.qtpl:243
 }
 
-//line templates/extra.qtpl:246
+//line templates/extra.qtpl:243
 func WriteExtraCDPTypes(qq422016 qtio422016.Writer) {
-	//line templates/extra.qtpl:246
+	//line templates/extra.qtpl:243
 	qw422016 := qt422016.AcquireWriter(qq422016)
-	//line templates/extra.qtpl:246
+	//line templates/extra.qtpl:243
 	StreamExtraCDPTypes(qw422016)
-	//line templates/extra.qtpl:246
+	//line templates/extra.qtpl:243
 	qt422016.ReleaseWriter(qw422016)
-//line templates/extra.qtpl:246
+//line templates/extra.qtpl:243
 }
 
-//line templates/extra.qtpl:246
+//line templates/extra.qtpl:243
 func ExtraCDPTypes() string {
-	//line templates/extra.qtpl:246
+	//line templates/extra.qtpl:243
 	qb422016 := qt422016.AcquireByteBuffer()
-	//line templates/extra.qtpl:246
+	//line templates/extra.qtpl:243
 	WriteExtraCDPTypes(qb422016)
-	//line templates/extra.qtpl:246
+	//line templates/extra.qtpl:243
 	qs422016 := string(qb422016.B)
-	//line templates/extra.qtpl:246
+	//line templates/extra.qtpl:243
 	qt422016.ReleaseByteBuffer(qb422016)
-	//line templates/extra.qtpl:246
+	//line templates/extra.qtpl:243
 	return qs422016
-//line templates/extra.qtpl:246
+//line templates/extra.qtpl:243
 }
 
 // ExtraUtilTemplate generates the decode func for the Message type.
 
-//line templates/extra.qtpl:249
+//line templates/extra.qtpl:246
 func StreamExtraUtilTemplate(qw422016 *qt422016.Writer, domains []*internal.Domain) {
-	//line templates/extra.qtpl:249
+	//line templates/extra.qtpl:246
 	qw422016.N().S(`
 type empty struct{}
 var emptyVal = &empty{}
@@ -555,66 +544,66 @@ var emptyVal = &empty{}
 func UnmarshalMessage(msg *cdp.Message) (interface{}, error) {
 	var v easyjson.Unmarshaler
 	switch msg.Method {`)
-	//line templates/extra.qtpl:256
+	//line templates/extra.qtpl:253
 	for _, d := range domains {
-		//line templates/extra.qtpl:256
+		//line templates/extra.qtpl:253
 		for _, c := range d.Commands {
-			//line templates/extra.qtpl:256
+			//line templates/extra.qtpl:253
 			qw422016.N().S(`
 	case cdp.`)
-			//line templates/extra.qtpl:257
+			//line templates/extra.qtpl:254
 			qw422016.N().S(c.CommandMethodType(d))
-			//line templates/extra.qtpl:257
+			//line templates/extra.qtpl:254
 			qw422016.N().S(`:`)
-			//line templates/extra.qtpl:257
+			//line templates/extra.qtpl:254
 			if len(c.Returns) == 0 {
-				//line templates/extra.qtpl:257
+				//line templates/extra.qtpl:254
 				qw422016.N().S(`
 		return emptyVal, nil`)
-				//line templates/extra.qtpl:258
+				//line templates/extra.qtpl:255
 			} else {
-				//line templates/extra.qtpl:258
+				//line templates/extra.qtpl:255
 				qw422016.N().S(`
 		v = new(`)
-				//line templates/extra.qtpl:259
+				//line templates/extra.qtpl:256
 				qw422016.N().S(d.PackageRefName())
-				//line templates/extra.qtpl:259
+				//line templates/extra.qtpl:256
 				qw422016.N().S(`.`)
-				//line templates/extra.qtpl:259
+				//line templates/extra.qtpl:256
 				qw422016.N().S(c.CommandReturnsType())
-				//line templates/extra.qtpl:259
+				//line templates/extra.qtpl:256
 				qw422016.N().S(`)`)
-				//line templates/extra.qtpl:259
+				//line templates/extra.qtpl:256
 			}
-			//line templates/extra.qtpl:259
+			//line templates/extra.qtpl:256
 			qw422016.N().S(`
 	`)
-			//line templates/extra.qtpl:260
+			//line templates/extra.qtpl:257
 		}
-		//line templates/extra.qtpl:260
+		//line templates/extra.qtpl:257
 		for _, e := range d.Events {
-			//line templates/extra.qtpl:260
+			//line templates/extra.qtpl:257
 			qw422016.N().S(`
 	case cdp.`)
-			//line templates/extra.qtpl:261
+			//line templates/extra.qtpl:258
 			qw422016.N().S(e.EventMethodType(d))
-			//line templates/extra.qtpl:261
+			//line templates/extra.qtpl:258
 			qw422016.N().S(`:
 		v = new(`)
-			//line templates/extra.qtpl:262
+			//line templates/extra.qtpl:259
 			qw422016.N().S(d.PackageRefName())
-			//line templates/extra.qtpl:262
+			//line templates/extra.qtpl:259
 			qw422016.N().S(`.`)
-			//line templates/extra.qtpl:262
+			//line templates/extra.qtpl:259
 			qw422016.N().S(e.EventType())
-			//line templates/extra.qtpl:262
+			//line templates/extra.qtpl:259
 			qw422016.N().S(`)
 	`)
-			//line templates/extra.qtpl:263
+			//line templates/extra.qtpl:260
 		}
-		//line templates/extra.qtpl:263
+		//line templates/extra.qtpl:260
 	}
-	//line templates/extra.qtpl:263
+	//line templates/extra.qtpl:260
 	qw422016.N().S(`}
 
 	var buf easyjson.RawMessage
@@ -637,69 +626,69 @@ func UnmarshalMessage(msg *cdp.Message) (interface{}, error) {
 	return v, nil
 }
 `)
-//line templates/extra.qtpl:284
+//line templates/extra.qtpl:281
 }
 
-//line templates/extra.qtpl:284
+//line templates/extra.qtpl:281
 func WriteExtraUtilTemplate(qq422016 qtio422016.Writer, domains []*internal.Domain) {
-	//line templates/extra.qtpl:284
+	//line templates/extra.qtpl:281
 	qw422016 := qt422016.AcquireWriter(qq422016)
-	//line templates/extra.qtpl:284
+	//line templates/extra.qtpl:281
 	StreamExtraUtilTemplate(qw422016, domains)
-	//line templates/extra.qtpl:284
+	//line templates/extra.qtpl:281
 	qt422016.ReleaseWriter(qw422016)
-//line templates/extra.qtpl:284
+//line templates/extra.qtpl:281
 }
 
-//line templates/extra.qtpl:284
+//line templates/extra.qtpl:281
 func ExtraUtilTemplate(domains []*internal.Domain) string {
-	//line templates/extra.qtpl:284
+	//line templates/extra.qtpl:281
 	qb422016 := qt422016.AcquireByteBuffer()
-	//line templates/extra.qtpl:284
+	//line templates/extra.qtpl:281
 	WriteExtraUtilTemplate(qb422016, domains)
-	//line templates/extra.qtpl:284
+	//line templates/extra.qtpl:281
 	qs422016 := string(qb422016.B)
-	//line templates/extra.qtpl:284
+	//line templates/extra.qtpl:281
 	qt422016.ReleaseByteBuffer(qb422016)
-	//line templates/extra.qtpl:284
+	//line templates/extra.qtpl:281
 	return qs422016
-//line templates/extra.qtpl:284
+//line templates/extra.qtpl:281
 }
 
-//line templates/extra.qtpl:286
+//line templates/extra.qtpl:283
 func StreamExtraMethodTypeDomainDecoder(qw422016 *qt422016.Writer) {
-	//line templates/extra.qtpl:286
+	//line templates/extra.qtpl:283
 	qw422016.N().S(`
 // Domain returns the Chrome Debugging Protocol domain of the event or command.
 func (t MethodType) Domain() string {
 	return string(t[:strings.IndexByte(string(t), '.')])
 }
 `)
-//line templates/extra.qtpl:291
+//line templates/extra.qtpl:288
 }
 
-//line templates/extra.qtpl:291
+//line templates/extra.qtpl:288
 func WriteExtraMethodTypeDomainDecoder(qq422016 qtio422016.Writer) {
-	//line templates/extra.qtpl:291
+	//line templates/extra.qtpl:288
 	qw422016 := qt422016.AcquireWriter(qq422016)
-	//line templates/extra.qtpl:291
+	//line templates/extra.qtpl:288
 	StreamExtraMethodTypeDomainDecoder(qw422016)
-	//line templates/extra.qtpl:291
+	//line templates/extra.qtpl:288
 	qt422016.ReleaseWriter(qw422016)
-//line templates/extra.qtpl:291
+//line templates/extra.qtpl:288
 }
 
-//line templates/extra.qtpl:291
+//line templates/extra.qtpl:288
 func ExtraMethodTypeDomainDecoder() string {
-	//line templates/extra.qtpl:291
+	//line templates/extra.qtpl:288
 	qb422016 := qt422016.AcquireByteBuffer()
-	//line templates/extra.qtpl:291
+	//line templates/extra.qtpl:288
 	WriteExtraMethodTypeDomainDecoder(qb422016)
-	//line templates/extra.qtpl:291
+	//line templates/extra.qtpl:288
 	qs422016 := string(qb422016.B)
-	//line templates/extra.qtpl:291
+	//line templates/extra.qtpl:288
 	qt422016.ReleaseByteBuffer(qb422016)
-	//line templates/extra.qtpl:291
+	//line templates/extra.qtpl:288
 	return qs422016
-//line templates/extra.qtpl:291
+//line templates/extra.qtpl:288
 }

examples/click/main.go

@@ -16,7 +16,7 @@ func main() {
 	defer cancel()
 
 	// create chrome instance
-	c, err := cdp.New(ctxt)
+	c, err := cdp.New(ctxt, cdp.WithLog(log.Printf))
 	if err != nil {
 		log.Fatal(err)
 	}

examples/edge-simple/main.go

@@ -9,9 +9,9 @@ import (
 	"log"
 	"time"
 
-	cdp "github.com/knq/chromedp"
+	cdp "github.com/knq/cdp"
-	cdptypes "github.com/knq/chromedp/cdp"
+	cdptypes "github.com/knq/cdp/cdp"
-	"github.com/knq/chromedp/client"
+	"github.com/knq/cdp/client"
 )
 
 func main() {
@@ -22,13 +22,13 @@ func main() {
 	defer cancel()
 
 	// create edge instance -- FIXME: not able to launch separate process (yet)
-	/*cdp, err := chromedp.New(ctxt, chromedp.WithRunnerOptions(
+	/*cdp, err := cdp.New(ctxt, cdp.WithRunnerOptions(
 		runner.EdgeDiagnosticsAdapter(),
 	))*/
 
 	// create edge instance
 	watch := client.New().WatchPageTargets(ctxt)
-	c, err := chromedp.New(ctxt, chromedp.WithTargets(watch))
+	c, err := cdp.New(ctxt, cdp.WithTargets(watch), cdp.WithLog(log.Printf))
 	if err != nil {
 		log.Fatal(err)
 	}

examples/eval/main.go

@@ -15,7 +15,7 @@ func main() {
 	defer cancel()
 
 	// create chrome instance
-	c, err := cdp.New(ctxt)
+	c, err := cdp.New(ctxt, cdp.WithLog(log.Printf))
 	if err != nil {
 		log.Fatal(err)
 	}

examples/headless/main.go

@@ -20,7 +20,7 @@ func main() {
 	defer cancel()
 
 	// create chrome
-	c, err := cdp.New(ctxt, cdp.WithTargets(client.New().WatchPageTargets(ctxt)))
+	c, err := cdp.New(ctxt, cdp.WithTargets(client.New().WatchPageTargets(ctxt)), cdp.WithLog(log.Printf))
 	if err != nil {
 		log.Fatal(err)
 	}

examples/keys/main.go

@@ -18,7 +18,7 @@ func main() {
 	defer cancel()
 
 	// create chrome instance
-	c, err := cdp.New(ctxt)
+	c, err := cdp.New(ctxt, cdp.WithLog(log.Printf))
 	if err != nil {
 		log.Fatal(err)
 	}

examples/screenshot/main.go

@@ -17,7 +17,7 @@ func main() {
 	defer cancel()
 
 	// create chrome instance
-	c, err := cdp.New(ctxt)
+	c, err := cdp.New(ctxt, cdp.WithLog(log.Printf))
 	if err != nil {
 		log.Fatal(err)
 	}

examples/simple/main.go

@@ -19,7 +19,7 @@ func main() {
 	defer cancel()
 
 	// create chrome instance
-	c, err := cdp.New(ctxt)
+	c, err := cdp.New(ctxt, cdp.WithLog(log.Printf))
 	if err != nil {
 		log.Fatal(err)
 	}

examples/submit/main.go

@@ -15,7 +15,7 @@ func main() {
 	defer cancel()
 
 	// create chrome instance
-	c, err := cdp.New(ctxt)
+	c, err := cdp.New(ctxt, cdp.WithLog(log.Printf))
 	if err != nil {
 		log.Fatal(err)
 	}

examples/text/main.go

@@ -15,7 +15,7 @@ func main() {
 	defer cancel()
 
 	// create chrome instance
-	c, err := cdp.New(ctxt)
+	c, err := cdp.New(ctxt, cdp.WithLog(log.Printf))
 	if err != nil {
 		log.Fatal(err)
 	}

examples/visible/main.go

@@ -20,7 +20,7 @@ func main() {
 	defer cancel()
 
 	// create chrome instance
-	c, err := cdp.New(ctxt)
+	c, err := cdp.New(ctxt, cdp.WithLog(log.Printf))
 	if err != nil {
 		log.Fatal(err)
 	}

handler.go

@@ -50,7 +50,7 @@ type TargetHandler struct {
 	lastm sync.Mutex
 
 	// res is the id->result channel map.
-	res   map[int64]chan interface{}
+	res   map[int64]chan easyjson.RawMessage
 	resrw sync.RWMutex
 
 	// logging funcs
@@ -87,7 +87,7 @@ func (h *TargetHandler) Run(ctxt context.Context) error {
 	h.qcmd = make(chan *cdp.Message)
 	h.qres = make(chan *cdp.Message)
 	h.qevents = make(chan *cdp.Message)
-	h.res = make(map[int64]chan interface{})
+	h.res = make(map[int64]chan easyjson.RawMessage)
 	h.detached = make(chan *inspector.EventDetached)
 	h.pageWaitGroup = new(sync.WaitGroup)
 	h.domWaitGroup = new(sync.WaitGroup)
@@ -182,19 +182,19 @@ func (h *TargetHandler) run(ctxt context.Context) {
 		case ev := <-h.qevents:
 			err = h.processEvent(ctxt, ev)
 			if err != nil {
-				h.errorf("could not process event, got: %v", err)
+				h.errorf("could not process event %s, got: %v", ev.Method, err)
 			}
 
 		case res := <-h.qres:
 			err = h.processResult(res)
 			if err != nil {
-				h.errorf("could not process command result, got: %v", err)
+				h.errorf("could not process result for message %d, got: %v", res.ID, err)
 			}
 
 		case cmd := <-h.qcmd:
 			err = h.processCommand(cmd)
 			if err != nil {
-				h.errorf("could not process command, got: %v", err)
+				h.errorf("could not process command message %d, got: %v", cmd.ID, err)
 			}
 
 		case <-ctxt.Done():
@@ -295,31 +295,27 @@ func (h *TargetHandler) documentUpdated(ctxt context.Context) {
 
 // processResult processes an incoming command result.
 func (h *TargetHandler) processResult(msg *cdp.Message) error {
-	h.resrw.Lock()
+	h.resrw.RLock()
-	defer h.resrw.Unlock()
+	defer h.resrw.RUnlock()
 
-	res, ok := h.res[msg.ID]
+	ch, ok := h.res[msg.ID]
 	if !ok {
-		err := fmt.Errorf("expected result to be present for message id %d", msg.ID)
+		return fmt.Errorf("id %d not present in res map", msg.ID)
-		h.errorf(err.Error())
-		return err
 	}
+	defer close(ch)
 
 	if msg.Error != nil {
-		res <- msg.Error
+		return msg.Error
-	} else {
-		res <- msg.Result
 	}
 
-	delete(h.res, msg.ID)
+	ch <- msg.Result
 
 	return nil
 }
 
 // processCommand writes a command to the client connection.
 func (h *TargetHandler) processCommand(cmd *cdp.Message) error {
-	// FIXME: there are two possible error conditions here, check and
+	// marshal
-	// do some kind of logging ...
 	buf, err := easyjson.Marshal(cmd)
 	if err != nil {
 		return err
@@ -327,61 +323,70 @@ func (h *TargetHandler) processCommand(cmd *cdp.Message) error {
 
 	h.debugf("<- %s", string(buf))
 
-	// write
 	return h.conn.Write(buf)
 }
 
+// emptyObj is an empty JSON object message.
+var emptyObj = easyjson.RawMessage([]byte(`{}`))
+
 // Execute executes commandType against the endpoint passed to Run, using the
-// provided context and the raw JSON encoded params.
+// provided context and params, decoding the result of the command to res.
-//
+func (h *TargetHandler) Execute(ctxt context.Context, commandType cdp.MethodType, params easyjson.Marshaler, res easyjson.Unmarshaler) error {
-// Returns a result channel that will receive AT MOST ONE result. A result is
+	var paramsBuf easyjson.RawMessage
-// either the command's result value (as a raw JSON encoded value), or any
+	if params == nil {
-// error encountered during operation. After the result (or an error) is passed
+		paramsBuf = emptyObj
-// to the returned channel, the channel will be closed.
+	} else {
-//
+		var err error
-// Note: the returned channel will be closed after the result is read. If the
+		paramsBuf, err = easyjson.Marshal(params)
-// passed context finishes prior to receiving the command result, then
+		if err != nil {
-// ctxt.Err() will be sent to the channel.
+			return err
-func (h *TargetHandler) Execute(ctxt context.Context, commandType cdp.MethodType, params easyjson.RawMessage) <-chan interface{} {
+		}
-	ch := make(chan interface{}, 1)
+	}
 
-	go func() {
+	id := h.next()
-		defer close(ch)
-
-		res := make(chan interface{}, 1)
-		defer close(res)
-
-		// get next id
-		h.lastm.Lock()
-		h.last++
-		id := h.last
-		h.lastm.Unlock()
 
 	// save channel
+	ch := make(chan easyjson.RawMessage, 1)
 	h.resrw.Lock()
-		h.res[id] = res
+	h.res[id] = ch
 	h.resrw.Unlock()
 
+	// queue message
 	h.qcmd <- &cdp.Message{
 		ID:     id,
 		Method: commandType,
-			Params: params,
+		Params: paramsBuf,
 	}
 
+	errch := make(chan error, 1)
+	go func() {
+		defer close(errch)
+
 		select {
-		case v := <-res:
+		case msg := <-ch:
-			if v != nil {
+			if res != nil {
-				ch <- v
+				errch <- easyjson.Unmarshal(msg, res)
-			} else {
-				ch <- cdp.ErrChannelClosed
 			}
 
 		case <-ctxt.Done():
-			ch <- ctxt.Err()
+			errch <- ctxt.Err()
 		}
+
+		h.resrw.Lock()
+		defer h.resrw.Unlock()
+
+		delete(h.res, id)
 	}()
 
-	return ch
+	return <-errch
+}
+
+// next returns the next message id.
+func (h *TargetHandler) next() int64 {
+	h.lastm.Lock()
+	defer h.lastm.Unlock()
+	h.last++
+	return h.last
 }
 
 // GetRoot returns the current top level frame's root document node.

util.go

@@ -346,8 +346,8 @@ func removeNode(n []*cdp.Node, id cdp.NodeID) []*cdp.Node {
 	return append(n[:i], n[i+1:]...)
 }
 
-// isCouldNotComputeBoxModelError unwraps the err as a MessagError and
+// isCouldNotComputeBoxModelError unwraps err as a MessageError and determines
-// determines if it is a compute box model error.
+// if it is a compute box model error.
 func isCouldNotComputeBoxModelError(err error) bool {
 	e, ok := err.(*cdp.MessageError)
 	return ok && e.Code == -32000 && e.Message == "Could not compute box model."