commons_go/chromedp
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route all communication via the browser

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Use a single websocket connection per browser, removing the need for an
extra websocket connection per target.

This is thanks to the Target.sendMessageToTarget command to send
messages to each target, and the Target.receivedMessageFromTarget event
to receive messages back.

The browser handles activity via a single worker goroutine, and the same
technique is used for each target. This means that commands and events
are dealt with in order, and we can do away with some complexity like
mutexes and extra go statements.
This commit is contained in:
Daniel Martí 2019-03-15 17:17:57 +00:00
parent 3d3bf22ccc
commit 81a48280ef
10 changed files with 452 additions and 653 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
actions.go
View File

@ -49,7 +49,6 @@ func Sleep(d time.Duration) Action {
return ActionFunc(func(ctxt context.Context, h cdp.Executor) error {
select {
case <-time.After(d):
case <-ctxt.Done():
return ctxt.Err()
}

3
allocate.go
View File

@ -136,11 +136,12 @@ func (p *ExecAllocator) Allocate(ctx context.Context) (*Browser, error) {
}
stderr.Close()
browser, err := NewBrowser(wsURL)
browser, err := NewBrowser(ctx, wsURL)
if err != nil {
return nil, err
}
browser.UserDataDir = dataDir
browser.Start(ctx)
return browser, nil
}

203
browser.go
View File

@ -8,10 +8,13 @@ package chromedp
import (
"context"
"encoding/json"
"log"
"sync/atomic"
"github.com/chromedp/cdproto"
"github.com/chromedp/cdproto/cdp"
"github.com/chromedp/cdproto/target"
"github.com/mailru/easyjson"
)
@ -21,26 +24,39 @@ import (
type Browser struct {
UserDataDir string
pages map[target.SessionID]*Target
conn Transport
// next is the next message id.
next int64
cmdQueue chan cmdJob
// qres is the incoming command result queue.
qres chan *cdproto.Message
// logging funcs
logf func(string, ...interface{})
errf func(string, ...interface{})
}
type cmdJob struct {
msg *cdproto.Message
resp chan *cdproto.Message
}
// NewBrowser creates a new browser.
func NewBrowser(urlstr string, opts ...BrowserOption) (*Browser, error) {
conn, err := Dial(ForceIP(urlstr))
func NewBrowser(ctx context.Context, urlstr string, opts ...BrowserOption) (*Browser, error) {
conn, err := DialContext(ctx, ForceIP(urlstr))
if err != nil {
return nil, err
}
b := &Browser{
conn: conn,
logf: log.Printf,
conn: conn,
pages: make(map[target.SessionID]*Target, 1024),
logf: log.Printf,
}
// apply options
@ -72,25 +88,182 @@ func (b *Browser) Shutdown() error {
// send writes the supplied message and params.
func (b *Browser) send(method cdproto.MethodType, params easyjson.RawMessage) error {
msg := &cdproto.Message{
Method: method,
ID: atomic.AddInt64(&b.next, 1),
Method: method,
Params: params,
}
buf, err := msg.MarshalJSON()
if err != nil {
return err
}
return b.conn.Write(buf)
return b.conn.Write(msg)
}
// sendToTarget writes the supplied message to the target.
func (b *Browser) sendToTarget(targetID string, method cdproto.MethodType, params easyjson.RawMessage) error {
func (b *Browser) executorForTarget(ctx context.Context, sessionID target.SessionID) *Target {
if sessionID == "" {
panic("empty session ID")
}
if t, ok := b.pages[sessionID]; ok {
return t
}
t := &Target{
browser: b,
sessionID: sessionID,
eventQueue: make(chan *cdproto.Message, 1024),
waitQueue: make(chan func(cur *cdp.Frame) bool, 1024),
frames: make(map[cdp.FrameID]*cdp.Frame),
logf: b.logf,
errf: b.errf,
}
go t.run(ctx)
b.pages[sessionID] = t
return t
}
func (b *Browser) Execute(ctx context.Context, method string, params json.Marshaler, res json.Unmarshaler) error {
paramsMsg := emptyObj
if params != nil {
var err error
if paramsMsg, err = json.Marshal(params); err != nil {
return err
}
}
id := atomic.AddInt64(&b.next, 1)
ch := make(chan *cdproto.Message, 1)
b.cmdQueue <- cmdJob{
msg: &cdproto.Message{
ID: id,
Method: cdproto.MethodType(method),
Params: paramsMsg,
},
resp: ch,
}
select {
case msg := <-ch:
switch {
case msg == nil:
return ErrChannelClosed
case msg.Error != nil:
return msg.Error
case res != nil:
return json.Unmarshal(msg.Result, res)
}
case <-ctx.Done():
return ctx.Err()
}
return nil
}
// CreateContext creates a new browser context.
func (b *Browser) CreateContext() (context.Context, error) {
return nil, nil
func (b *Browser) Start(ctx context.Context) {
b.cmdQueue = make(chan cmdJob)
b.qres = make(chan *cdproto.Message)
go b.run(ctx)
}
func (b *Browser) run(ctx context.Context) {
defer b.conn.Close()
// add cancel to context
ctx, cancel := context.WithCancel(ctx)
defer cancel()
go func() {
defer cancel()
for {
select {
case <-ctx.Done():
return
default:
// continue below
}
msg, err := b.conn.Read()
if err != nil {
return
}
var sessionID target.SessionID
if msg.Method == cdproto.EventTargetReceivedMessageFromTarget {
recv := new(target.EventReceivedMessageFromTarget)
if err := json.Unmarshal(msg.Params, recv); err != nil {
b.errf("%s", err)
continue
}
sessionID = recv.SessionID
msg = new(cdproto.Message)
if err := json.Unmarshal([]byte(recv.Message), msg); err != nil {
b.errf("%s", err)
continue
}
}
switch {
case msg.Method != "":
if sessionID == "" {
// TODO: are we interested in
// these events?
continue
}
page, ok := b.pages[sessionID]
if !ok {
b.errf("unknown session ID %q", sessionID)
continue
}
select {
case page.eventQueue <- msg:
default:
panic("eventQueue is full")
}
case msg.ID != 0:
b.qres <- msg
default:
b.errf("ignoring malformed incoming message (missing id or method): %#v", msg)
}
}
}()
respByID := make(map[int64]chan *cdproto.Message)
// process queues
for {
select {
case res := <-b.qres:
resp, ok := respByID[res.ID]
if !ok {
b.errf("id %d not present in response map", res.ID)
continue
}
if resp != nil {
// resp could be nil, if we're not interested in
// this response; for CommandSendMessageToTarget.
resp <- res
close(resp)
}
delete(respByID, res.ID)
case q := <-b.cmdQueue:
if _, ok := respByID[q.msg.ID]; ok {
b.errf("id %d already present in response map", q.msg.ID)
continue
}
respByID[q.msg.ID] = q.resp
if q.msg.Method == "" {
// Only register the chananel in respByID;
// useful for CommandSendMessageToTarget.
continue
}
if err := b.conn.Write(q.msg); err != nil {
b.errf("%s", err)
continue
}
case <-ctx.Done():
return
}
}
}
// BrowserOption is a browser option.

22
conn.go
View File

@ -1,10 +1,12 @@
package chromedp
import (
"context"
"io"
"net"
"strings"
"github.com/chromedp/cdproto"
"github.com/gorilla/websocket"
)
@ -18,8 +20,8 @@ var (
// Transport is the common interface to send/receive messages to a target.
type Transport interface {
Read() ([]byte, error)
Write([]byte) error
Read() (*cdproto.Message, error)
Write(*cdproto.Message) error
io.Closer
}
@ -29,28 +31,28 @@ type Conn struct {
}
// Read reads the next message.
func (c *Conn) Read() ([]byte, error) {
_, buf, err := c.ReadMessage()
if err != nil {
func (c *Conn) Read() (*cdproto.Message, error) {
msg := new(cdproto.Message)
if err := c.ReadJSON(msg); err != nil {
return nil, err
}
return buf, nil
return msg, nil
}
// Write writes a message.
func (c *Conn) Write(buf []byte) error {
return c.WriteMessage(websocket.TextMessage, buf)
func (c *Conn) Write(msg *cdproto.Message) error {
return c.WriteJSON(msg)
}
// Dial dials the specified websocket URL using gorilla/websocket.
func Dial(urlstr string) (*Conn, error) {
func DialContext(ctx context.Context, urlstr string) (*Conn, error) {
d := &websocket.Dialer{
ReadBufferSize: DefaultReadBufferSize,
WriteBufferSize: DefaultWriteBufferSize,
}
// connect
conn, _, err := d.Dial(urlstr, nil)
conn, _, err := d.DialContext(ctx, urlstr, nil)
if err != nil {
return nil, err
}

62
context.go
View File

@ -3,7 +3,15 @@ package chromedp
import (
"context"
"encoding/json"
"net/http"
"fmt"
"github.com/chromedp/cdproto/css"
"github.com/chromedp/cdproto/dom"
"github.com/chromedp/cdproto/inspector"
"github.com/chromedp/cdproto/log"
"github.com/chromedp/cdproto/page"
"github.com/chromedp/cdproto/runtime"
"github.com/chromedp/cdproto/target"
)
// Executor
@ -16,10 +24,8 @@ type Context struct {
Allocator Allocator
browser *Browser
handler *TargetHandler
logf func(string, ...interface{})
errf func(string, ...interface{})
sessionID target.SessionID
}
// Wait can be called after cancelling the context containing Context, to block
@ -75,41 +81,47 @@ func Run(ctx context.Context, action Action) error {
}
c.browser = browser
}
if c.handler == nil {
if err := c.newHandler(ctx); err != nil {
if c.sessionID == "" {
if err := c.newSession(ctx); err != nil {
return err
}
}
return action.Do(ctx, c.handler)
return action.Do(ctx, c.browser.executorForTarget(ctx, c.sessionID))
}
func (c *Context) newHandler(ctx context.Context) error {
// TODO: add RemoteAddr() to the Transport interface?
conn := c.browser.conn.(*Conn).Conn
addr := conn.RemoteAddr()
url := "http://" + addr.String() + "/json/new"
resp, err := http.Get(url)
func (c *Context) newSession(ctx context.Context) error {
create := target.CreateTarget("about:blank")
targetID, err := create.Do(ctx, c.browser)
if err != nil {
return err
}
defer resp.Body.Close()
var wurl withWebsocketURL
if err := json.NewDecoder(resp.Body).Decode(&wurl); err != nil {
return err
}
c.handler, err = NewTargetHandler(wurl.WebsocketURL)
attach := target.AttachToTarget(targetID)
sessionID, err := attach.Do(ctx, c.browser)
if err != nil {
return err
}
if err := c.handler.Run(ctx); err != nil {
return err
target := c.browser.executorForTarget(ctx, sessionID)
// enable domains
for _, enable := range []Action{
log.Enable(),
runtime.Enable(),
//network.Enable(),
inspector.Enable(),
page.Enable(),
dom.Enable(),
css.Enable(),
} {
if err := enable.Do(ctx, target); err != nil {
return fmt.Errorf("unable to execute %T: %v", enable, err)
}
}
c.sessionID = sessionID
return nil
}
type withWebsocketURL struct {
WebsocketURL string `json:"webSocketDebuggerUrl"`
}
// ContextOption
type ContextOption func(*Context)

611
handler.go
View File

@ -3,235 +3,138 @@ package chromedp
import (
"context"
"encoding/json"
"fmt"
"reflect"
goruntime "runtime"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/mailru/easyjson"
"github.com/chromedp/cdproto"
"github.com/chromedp/cdproto/cdp"
"github.com/chromedp/cdproto/css"
"github.com/chromedp/cdproto/dom"
"github.com/chromedp/cdproto/inspector"
"github.com/chromedp/cdproto/log"
"github.com/chromedp/cdproto/page"
"github.com/chromedp/cdproto/runtime"
"github.com/chromedp/cdproto/target"
)
// TargetHandler manages a Chrome DevTools Protocol target.
type TargetHandler struct {
conn Transport
// Target manages a Chrome DevTools Protocol target.
type Target struct {
browser *Browser
sessionID target.SessionID
waitQueue chan func(cur *cdp.Frame) bool
eventQueue chan *cdproto.Message
// below are the old TargetHandler fields.
// frames is the set of encountered frames.
frames map[cdp.FrameID]*cdp.Frame
// cur is the current top level frame.
cur *cdp.Frame
// qcmd is the outgoing message queue.
qcmd chan *cdproto.Message
// qres is the incoming command result queue.
qres chan *cdproto.Message
// qevents is the incoming event queue.
qevents chan *cdproto.Message
// detached is closed when the detached event is received.
detached chan *inspector.EventDetached
pageWaitGroup, domWaitGroup *sync.WaitGroup
// last is the last sent message identifier.
last int64
lastm sync.Mutex
// res is the id->result channel map.
res map[int64]chan *cdproto.Message
resrw sync.RWMutex
// cur is the current top level frame. TODO: delete mutex
curMu sync.RWMutex
cur *cdp.Frame
// logging funcs
logf, debugf, errf func(string, ...interface{})
sync.RWMutex
logf, errf func(string, ...interface{})
}
// NewTargetHandler creates a new handler for the specified client target.
func NewTargetHandler(urlstr string, opts ...TargetHandlerOption) (*TargetHandler, error) {
conn, err := Dial(urlstr)
if err != nil {
return nil, err
}
func (t *Target) run(ctx context.Context) {
for {
select {
case <-ctx.Done():
return
case msg := <-t.eventQueue:
//fmt.Printf("%d %s: %s\n", msg.ID, msg.Method, msg.Params)
if err := t.processEvent(ctx, msg); err != nil {
t.errf("could not process event: %v", err)
continue
}
default:
// prevent busy spinning. TODO: do better
time.Sleep(5 * time.Millisecond)
n := len(t.waitQueue)
if n == 0 {
continue
}
h := &TargetHandler{
conn: conn,
errf: func(string, ...interface{}) {},
}
t.curMu.RLock()
cur := t.cur
t.curMu.RUnlock()
if cur == nil {
continue
}
for _, o := range opts {
o(h)
}
return h, nil
}
// Run starts the processing of commands and events of the client target
// provided to NewTargetHandler.
//
// Callers can stop Run by closing the passed context.
func (h *TargetHandler) Run(ctxt context.Context) error {
// reset
h.Lock()
h.frames = make(map[cdp.FrameID]*cdp.Frame)
h.qcmd = make(chan *cdproto.Message)
h.qres = make(chan *cdproto.Message)
h.qevents = make(chan *cdproto.Message)
h.res = make(map[int64]chan *cdproto.Message)
h.detached = make(chan *inspector.EventDetached, 1)
h.pageWaitGroup = new(sync.WaitGroup)
h.domWaitGroup = new(sync.WaitGroup)
h.Unlock()
// run
go h.run(ctxt)
// enable domains
for _, a := range []Action{
log.Enable(),
runtime.Enable(),
//network.Enable(),
inspector.Enable(),
page.Enable(),
dom.Enable(),
css.Enable(),
} {
if err := a.Do(ctxt, h); err != nil {
return fmt.Errorf("unable to execute %s: %v", reflect.TypeOf(a), err)
for i := 0; i < n; i++ {
fn := <-t.waitQueue
if !fn(cur) {
// try again later.
t.waitQueue <- fn
}
}
}
}
}
h.Lock()
// get page resources
tree, err := page.GetResourceTree().Do(ctxt, h)
func (t *Target) Execute(ctx context.Context, method string, params json.Marshaler, res json.Unmarshaler) error {
paramsMsg := emptyObj
if params != nil {
var err error
if paramsMsg, err = json.Marshal(params); err != nil {
return err
}
}
innerID := atomic.AddInt64(&t.browser.next, 1)
msg := &cdproto.Message{
ID: innerID,
Method: cdproto.MethodType(method),
Params: paramsMsg,
}
msgJSON, err := json.Marshal(msg)
if err != nil {
return fmt.Errorf("unable to get resource tree: %v", err)
return err
}
sendParams := target.SendMessageToTarget(string(msgJSON)).
WithSessionID(t.sessionID)
sendParamsJSON, _ := json.Marshal(sendParams)
// We want to grab the response from the inner message.
ch := make(chan *cdproto.Message, 1)
t.browser.cmdQueue <- cmdJob{
msg: &cdproto.Message{ID: innerID},
resp: ch,
}
h.frames[tree.Frame.ID] = tree.Frame
h.cur = tree.Frame
for _, c := range tree.ChildFrames {
h.frames[c.Frame.ID] = c.Frame
// The response from the outer message is uninteresting; pass a nil
// resp channel.
outerID := atomic.AddInt64(&t.browser.next, 1)
t.browser.cmdQueue <- cmdJob{
msg: &cdproto.Message{
ID: outerID,
Method: target.CommandSendMessageToTarget,
Params: sendParamsJSON,
},
}
h.Unlock()
h.documentUpdated(ctxt)
select {
case msg := <-ch:
switch {
case msg == nil:
return ErrChannelClosed
case msg.Error != nil:
return msg.Error
case res != nil:
return json.Unmarshal(msg.Result, res)
}
case <-ctx.Done():
return ctx.Err()
}
return nil
}
// run handles the actual message processing to / from the web socket connection.
func (h *TargetHandler) run(ctxt context.Context) {
defer h.conn.Close()
// add cancel to context
ctxt, cancel := context.WithCancel(ctxt)
defer cancel()
go func() {
defer cancel()
for {
select {
default:
msg, err := h.read()
if err != nil {
return
}
switch {
case msg.Method != "":
select {
case h.qevents <- msg:
case <-ctxt.Done():
return
}
case msg.ID != 0:
select {
case h.qres <- msg:
case <-ctxt.Done():
return
}
default:
h.errf("ignoring malformed incoming message (missing id or method): %#v", msg)
}
case <-h.detached:
// FIXME: should log when detached, and reason
return
case <-ctxt.Done():
return
}
}
}()
// process queues
for {
select {
case ev := <-h.qevents:
err := h.processEvent(ctxt, ev)
if err != nil {
h.errf("could not process event %s: %v", ev.Method, err)
}
case res := <-h.qres:
err := h.processResult(res)
if err != nil {
h.errf("could not process result for message %d: %v", res.ID, err)
}
case cmd := <-h.qcmd:
err := h.processCommand(cmd)
if err != nil {
h.errf("could not process command message %d: %v", cmd.ID, err)
}
case <-ctxt.Done():
return
}
}
}
// read reads a message from the client connection.
func (h *TargetHandler) read() (*cdproto.Message, error) {
// read
buf, err := h.conn.Read()
if err != nil {
return nil, err
}
//h.debugf("-> %s", string(buf))
// unmarshal
msg := new(cdproto.Message)
if err := json.Unmarshal(buf, msg); err != nil {
return nil, err
}
return msg, nil
}
// below are the old TargetHandler methods.
// processEvent processes an incoming event.
func (h *TargetHandler) processEvent(ctxt context.Context, msg *cdproto.Message) error {
func (t *Target) processEvent(ctxt context.Context, msg *cdproto.Message) error {
if msg == nil {
return ErrChannelClosed
}
@ -251,46 +154,29 @@ func (h *TargetHandler) processEvent(ctxt context.Context, msg *cdproto.Message)
return err
}
switch e := ev.(type) {
switch ev.(type) {
case *inspector.EventDetached:
h.Lock()
defer h.Unlock()
h.detached <- e
return nil
case *dom.EventDocumentUpdated:
h.domWaitGroup.Wait()
go h.documentUpdated(ctxt)
t.documentUpdated(ctxt)
return nil
}
d := msg.Method.Domain()
if d != "Page" && d != "DOM" {
return nil
}
switch d {
switch msg.Method.Domain() {
case "Page":
h.pageWaitGroup.Add(1)
go h.pageEvent(ctxt, ev)
t.pageEvent(ctxt, ev)
case "DOM":
h.domWaitGroup.Add(1)
go h.domEvent(ctxt, ev)
t.domEvent(ctxt, ev)
}
return nil
}
// documentUpdated handles the document updated event, retrieving the document
// root for the root frame.
func (h *TargetHandler) documentUpdated(ctxt context.Context) {
f, err := h.WaitFrame(ctxt, cdp.EmptyFrameID)
if err != nil {
h.errf("could not get current frame: %v", err)
return
}
func (t *Target) documentUpdated(ctxt context.Context) {
t.curMu.RLock()
f := t.cur
t.curMu.RUnlock()
f.Lock()
defer f.Unlock()
@ -300,242 +186,33 @@ func (h *TargetHandler) documentUpdated(ctxt context.Context) {
}
f.Nodes = make(map[cdp.NodeID]*cdp.Node)
f.Root, err = dom.GetDocument().WithPierce(true).Do(ctxt, h)
var err error
f.Root, err = dom.GetDocument().WithPierce(true).Do(ctxt, t)
if err == context.Canceled {
return // TODO: perhaps not necessary, but useful to keep the tests less noisy
}
if err != nil {
h.errf("could not retrieve document root for %s: %v", f.ID, err)
t.errf("could not retrieve document root for %s: %v", f.ID, err)
return
}
f.Root.Invalidated = make(chan struct{})
walk(f.Nodes, f.Root)
}
// processResult processes an incoming command result.
func (h *TargetHandler) processResult(msg *cdproto.Message) error {
h.resrw.RLock()
defer h.resrw.RUnlock()
ch, ok := h.res[msg.ID]
if !ok {
return fmt.Errorf("id %d not present in res map", msg.ID)
}
defer close(ch)
ch <- msg
return nil
}
// processCommand writes a command to the client connection.
func (h *TargetHandler) processCommand(cmd *cdproto.Message) error {
// marshal
buf, err := json.Marshal(cmd)
if err != nil {
return err
}
//h.debugf("<- %s", string(buf))
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 params, decoding the result of the command to res.
func (h *TargetHandler) Execute(ctxt context.Context, methodType string, params json.Marshaler, res json.Unmarshaler) error {
var paramsBuf easyjson.RawMessage
if params == nil {
paramsBuf = emptyObj
} else {
var err error
paramsBuf, err = json.Marshal(params)
if err != nil {
return err
}
}
id := h.next()
// save channel
ch := make(chan *cdproto.Message, 1)
h.resrw.Lock()
h.res[id] = ch
h.resrw.Unlock()
// queue message
select {
case h.qcmd <- &cdproto.Message{
ID: id,
Method: cdproto.MethodType(methodType),
Params: paramsBuf,
}:
case <- ctxt.Done():
return ctxt.Err()
}
errch := make(chan error, 1)
go func() {
defer close(errch)
select {
case msg := <-ch:
switch {
case msg == nil:
errch <- ErrChannelClosed
case msg.Error != nil:
errch <- msg.Error
case res != nil:
errch <- json.Unmarshal(msg.Result, res)
}
case <-ctxt.Done():
errch <- ctxt.Err()
}
h.resrw.Lock()
defer h.resrw.Unlock()
delete(h.res, id)
}()
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.
func (h *TargetHandler) GetRoot(ctxt context.Context) (*cdp.Node, error) {
var root *cdp.Node
for {
var cur *cdp.Frame
select {
default:
h.RLock()
cur = h.cur
if cur != nil {
cur.RLock()
root = cur.Root
cur.RUnlock()
}
h.RUnlock()
if cur != nil && root != nil {
return root, nil
}
time.Sleep(DefaultCheckDuration)
case <-ctxt.Done():
return nil, ctxt.Err()
}
}
}
// SetActive sets the currently active frame after a successful navigation.
func (h *TargetHandler) SetActive(ctxt context.Context, id cdp.FrameID) error {
// get frame
f, err := h.WaitFrame(ctxt, id)
if err != nil {
return err
}
h.Lock()
defer h.Unlock()
h.cur = f
return nil
}
// WaitFrame waits for a frame to be loaded using the provided context.
func (h *TargetHandler) WaitFrame(ctxt context.Context, id cdp.FrameID) (*cdp.Frame, error) {
// TODO: fix this
timeout := time.After(time.Second)
for {
select {
default:
var f *cdp.Frame
var ok bool
h.RLock()
if id == cdp.EmptyFrameID {
f, ok = h.cur, h.cur != nil
} else {
f, ok = h.frames[id]
}
h.RUnlock()
if ok {
return f, nil
}
time.Sleep(DefaultCheckDuration)
case <-ctxt.Done():
return nil, ctxt.Err()
case <-timeout:
return nil, fmt.Errorf("timeout waiting for frame `%s`", id)
}
}
}
// WaitNode waits for a node to be loaded using the provided context.
func (h *TargetHandler) WaitNode(ctxt context.Context, f *cdp.Frame, id cdp.NodeID) (*cdp.Node, error) {
// TODO: fix this
timeout := time.After(time.Second)
for {
select {
default:
var n *cdp.Node
var ok bool
f.RLock()
n, ok = f.Nodes[id]
f.RUnlock()
if n != nil && ok {
return n, nil
}
time.Sleep(DefaultCheckDuration)
case <-ctxt.Done():
return nil, ctxt.Err()
case <-timeout:
return nil, fmt.Errorf("timeout waiting for node `%d`", id)
}
}
}
// pageEvent handles incoming page events.
func (h *TargetHandler) pageEvent(ctxt context.Context, ev interface{}) {
defer h.pageWaitGroup.Done()
func (t *Target) pageEvent(ctxt context.Context, ev interface{}) {
var id cdp.FrameID
var op frameOp
switch e := ev.(type) {
case *page.EventFrameNavigated:
h.Lock()
h.frames[e.Frame.ID] = e.Frame
if h.cur != nil && h.cur.ID == e.Frame.ID {
h.cur = e.Frame
}
h.Unlock()
t.frames[e.Frame.ID] = e.Frame
t.curMu.Lock()
t.cur = e.Frame
t.curMu.Unlock()
return
case *page.EventFrameAttached:
@ -545,7 +222,10 @@ func (h *TargetHandler) pageEvent(ctxt context.Context, ev interface{}) {
id, op = e.FrameID, frameDetached
case *page.EventFrameStartedLoading:
id, op = e.FrameID, frameStartedLoading
// TODO: this happens before EventFrameNavigated, so the frame
// isn't in t.frames yet.
//id, op = e.FrameID, frameStartedLoading
return
case *page.EventFrameStoppedLoading:
id, op = e.FrameID, frameStoppedLoading
@ -563,18 +243,11 @@ func (h *TargetHandler) pageEvent(ctxt context.Context, ev interface{}) {
return
default:
h.errf("unhandled page event %s", reflect.TypeOf(ev))
t.errf("unhandled page event %T", ev)
return
}
f, err := h.WaitFrame(ctxt, id)
if err != nil {
h.errf("could not get frame %s: %v", id, err)
return
}
h.Lock()
defer h.Unlock()
f := t.frames[id]
f.Lock()
defer f.Unlock()
@ -583,15 +256,10 @@ func (h *TargetHandler) pageEvent(ctxt context.Context, ev interface{}) {
}
// domEvent handles incoming DOM events.
func (h *TargetHandler) domEvent(ctxt context.Context, ev interface{}) {
defer h.domWaitGroup.Done()
// wait current frame
f, err := h.WaitFrame(ctxt, cdp.EmptyFrameID)
if err != nil {
h.errf("could not process DOM event %s: %v", reflect.TypeOf(ev), err)
return
}
func (t *Target) domEvent(ctxt context.Context, ev interface{}) {
t.curMu.RLock()
f := t.cur
t.curMu.RUnlock()
var id cdp.NodeID
var op nodeOp
@ -620,12 +288,6 @@ func (h *TargetHandler) domEvent(ctxt context.Context, ev interface{}) {
id, op = e.NodeID, childNodeCountUpdated(e.ChildNodeCount)
case *dom.EventChildNodeInserted:
if e.PreviousNodeID != cdp.EmptyNodeID {
_, err = h.WaitNode(ctxt, f, e.PreviousNodeID)
if err != nil {
return
}
}
id, op = e.ParentNodeID, childNodeInserted(f.Nodes, e.PreviousNodeID, e.Node)
case *dom.EventChildNodeRemoved:
@ -647,29 +309,20 @@ func (h *TargetHandler) domEvent(ctxt context.Context, ev interface{}) {
id, op = e.InsertionPointID, distributedNodesUpdated(e.DistributedNodes)
default:
h.errf("unhandled node event %s", reflect.TypeOf(ev))
t.errf("unhandled node event %T", ev)
return
}
// retrieve node
n, err := h.WaitNode(ctxt, f, id)
if err != nil {
s := strings.TrimSuffix(goruntime.FuncForPC(reflect.ValueOf(op).Pointer()).Name(), ".func1")
i := strings.LastIndex(s, ".")
if i != -1 {
s = s[i+1:]
}
h.errf("could not perform (%s) operation on node %d (wait node): %v", s, id, err)
n, ok := f.Nodes[id]
if !ok {
// Node ID has been invalidated. Nothing to do.
return
}
h.Lock()
defer h.Unlock()
f.Lock()
defer f.Unlock()
op(n)
}
type TargetHandlerOption func(*TargetHandler)
type TargetOption func(*Target)

13
nav.go
View File

@ -11,17 +11,8 @@ import (
// Navigate navigates the current frame.
func Navigate(urlstr string) Action {
return ActionFunc(func(ctxt context.Context, h cdp.Executor) error {
th, ok := h.(*TargetHandler)
if !ok {
return ErrInvalidHandler
}
frameID, _, _, err := page.Navigate(urlstr).Do(ctxt, th)
if err != nil {
return err
}
return th.SetActive(ctxt, frameID)
_, _, _, err := page.Navigate(urlstr).Do(ctxt, h)
return err
})
}

50
query.go
View File

@ -25,7 +25,7 @@ func Nodes(sel interface{}, nodes *[]*cdp.Node, opts ...QueryOption) Action {
panic("nodes cannot be nil")
}
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, n ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, n ...*cdp.Node) error {
*nodes = n
return nil
}, opts...)
@ -37,7 +37,7 @@ func NodeIDs(sel interface{}, ids *[]cdp.NodeID, opts ...QueryOption) Action {
panic("nodes cannot be nil")
}
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
nodeIDs := make([]cdp.NodeID, len(nodes))
for i, n := range nodes {
nodeIDs[i] = n.NodeID
@ -51,7 +51,7 @@ func NodeIDs(sel interface{}, ids *[]cdp.NodeID, opts ...QueryOption) Action {
// Focus focuses the first node matching the selector.
func Focus(sel interface{}, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -62,7 +62,7 @@ func Focus(sel interface{}, opts ...QueryOption) Action {
// Blur unfocuses (blurs) the first node matching the selector.
func Blur(sel interface{}, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -87,7 +87,7 @@ func Dimensions(sel interface{}, model **dom.BoxModel, opts ...QueryOption) Acti
if model == nil {
panic("model cannot be nil")
}
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -103,7 +103,7 @@ func Text(sel interface{}, text *string, opts ...QueryOption) Action {
panic("text cannot be nil")
}
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -114,7 +114,7 @@ func Text(sel interface{}, text *string, opts ...QueryOption) Action {
// Clear clears the values of any input/textarea nodes matching the selector.
func Clear(sel interface{}, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -190,7 +190,7 @@ func Attributes(sel interface{}, attributes *map[string]string, opts ...QueryOpt
panic("attributes cannot be nil")
}
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -219,7 +219,7 @@ func AttributesAll(sel interface{}, attributes *[]map[string]string, opts ...Que
panic("attributes cannot be nil")
}
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -243,7 +243,7 @@ func AttributesAll(sel interface{}, attributes *[]map[string]string, opts ...Que
// SetAttributes sets the element attributes for the first node matching the
// selector.
func SetAttributes(sel interface{}, attributes map[string]string, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return errors.New("expected at least one element")
}
@ -265,7 +265,7 @@ func AttributeValue(sel interface{}, name string, value *string, ok *bool, opts
panic("value cannot be nil")
}
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return errors.New("expected at least one element")
}
@ -295,7 +295,7 @@ func AttributeValue(sel interface{}, name string, value *string, ok *bool, opts
// SetAttributeValue sets the element attribute with name to value for the
// first node matching the selector.
func SetAttributeValue(sel interface{}, name, value string, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -307,7 +307,7 @@ func SetAttributeValue(sel interface{}, name, value string, opts ...QueryOption)
// RemoveAttribute removes the element attribute with name from the first node
// matching the selector.
func RemoveAttribute(sel interface{}, name string, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -322,7 +322,7 @@ func JavascriptAttribute(sel interface{}, name string, res interface{}, opts ...
if res == nil {
panic("res cannot be nil")
}
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -334,7 +334,7 @@ func JavascriptAttribute(sel interface{}, name string, res interface{}, opts ...
// SetJavascriptAttribute sets the javascript attribute for the first node
// matching the selector.
func SetJavascriptAttribute(sel interface{}, name, value string, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -370,7 +370,7 @@ func InnerHTML(sel interface{}, html *string, opts ...QueryOption) Action {
// Click sends a mouse click event to the first node matching the selector.
func Click(sel interface{}, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -382,7 +382,7 @@ func Click(sel interface{}, opts ...QueryOption) Action {
// DoubleClick sends a mouse double click event to the first node matching the
// selector.
func DoubleClick(sel interface{}, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -397,7 +397,7 @@ func DoubleClick(sel interface{}, opts ...QueryOption) Action {
// Note: when selector matches a input[type="file"] node, then dom.SetFileInputFiles
// is used to set the upload path of the input node to v.
func SendKeys(sel interface{}, v string, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -426,7 +426,7 @@ func SendKeys(sel interface{}, v string, opts ...QueryOption) Action {
// SetUploadFiles sets the files to upload (ie, for a input[type="file"] node)
// for the first node matching the selector.
func SetUploadFiles(sel interface{}, files []string, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -441,7 +441,7 @@ func Screenshot(sel interface{}, picbuf *[]byte, opts ...QueryOption) Action {
panic("picbuf cannot be nil")
}
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -497,7 +497,7 @@ func Screenshot(sel interface{}, picbuf *[]byte, opts ...QueryOption) Action {
// Submit is an action that submits the form of the first node matching the
// selector belongs to.
func Submit(sel interface{}, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -519,7 +519,7 @@ func Submit(sel interface{}, opts ...QueryOption) Action {
// Reset is an action that resets the form of the first node matching the
// selector belongs to.
func Reset(sel interface{}, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -544,7 +544,7 @@ func ComputedStyle(sel interface{}, style *[]*css.ComputedProperty, opts ...Quer
panic("style cannot be nil")
}
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -567,7 +567,7 @@ func MatchedStyle(sel interface{}, style **css.GetMatchedStylesForNodeReturns, o
panic("style cannot be nil")
}
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}
@ -589,7 +589,7 @@ func MatchedStyle(sel interface{}, style **css.GetMatchedStylesForNodeReturns, o
// ScrollIntoView scrolls the window to the first node matching the selector.
func ScrollIntoView(sel interface{}, opts ...QueryOption) Action {
return QueryAfter(sel, func(ctxt context.Context, h *TargetHandler, nodes ...*cdp.Node) error {
return QueryAfter(sel, func(ctxt context.Context, h *Target, nodes ...*cdp.Node) error {
if len(nodes) < 1 {
return fmt.Errorf("selector `%s` did not return any nodes", sel)
}

1
query_test.go
View File

@ -925,6 +925,7 @@ func TestFileUpload(t *testing.T) {
t.Fatal(err)
}
defer os.Remove(tmpfile.Name())
defer tmpfile.Close()
if _, err := tmpfile.WriteString(uploadHTML); err != nil {
t.Fatal(err)
}

139
sel.go
View File

@ -5,7 +5,6 @@ import (
"fmt"
"strings"
"sync"
"time"
"github.com/chromedp/cdproto/cdp"
"github.com/chromedp/cdproto/dom"
@ -26,9 +25,9 @@ tagname
type Selector struct {
sel interface{}
exp int
by func(context.Context, *TargetHandler, *cdp.Node) ([]cdp.NodeID, error)
wait func(context.Context, *TargetHandler, *cdp.Node, ...cdp.NodeID) ([]*cdp.Node, error)
after func(context.Context, *TargetHandler, ...*cdp.Node) error
by func(context.Context, *Target, *cdp.Node) ([]cdp.NodeID, error)
wait func(context.Context, *Target, *cdp.Frame, ...cdp.NodeID) ([]*cdp.Node, error)
after func(context.Context, *Target, ...*cdp.Node) error
}
// Query is an action to query for document nodes match the specified sel and
@ -57,15 +56,11 @@ func Query(sel interface{}, opts ...QueryOption) Action {
// Do satisfies the Action interface.
func (s *Selector) Do(ctxt context.Context, h cdp.Executor) error {
th, ok := h.(*TargetHandler)
th, ok := h.(*Target)
if !ok {
return ErrInvalidHandler
}
// TODO: fix this
ctxt, cancel := context.WithTimeout(ctxt, 100*time.Second)
defer cancel()
var err error
select {
case err = <-s.run(ctxt, th):
@ -79,53 +74,35 @@ func (s *Selector) Do(ctxt context.Context, h cdp.Executor) error {
// run runs the selector action, starting over if the original returned nodes
// are invalidated prior to finishing the selector's by, wait, check, and after
// funcs.
func (s *Selector) run(ctxt context.Context, h *TargetHandler) chan error {
func (s *Selector) run(ctxt context.Context, h *Target) chan error {
ch := make(chan error, 1)
h.waitQueue <- func(cur *cdp.Frame) bool {
cur.RLock()
root := cur.Root
cur.RUnlock()
go func() {
defer close(ch)
if root == nil {
// not ready?
return false
}
for {
root, err := h.GetRoot(ctxt)
if err != nil {
select {
case <-ctxt.Done():
ch <- ctxt.Err()
return
default:
continue
}
}
select {
default:
ids, err := s.by(ctxt, h, root)
if err == nil && len(ids) >= s.exp {
nodes, err := s.wait(ctxt, h, root, ids...)
if err == nil {
if s.after == nil {
return
}
if err := s.after(ctxt, h, nodes...); err != nil {
ch <- err
}
return
}
}
time.Sleep(DefaultCheckDuration)
case <-root.Invalidated:
continue
case <-ctxt.Done():
ch <- ctxt.Err()
return
ids, err := s.by(ctxt, h, root)
if err != nil || len(ids) < s.exp {
return false
}
nodes, err := s.wait(ctxt, h, cur, ids...)
// if nodes==nil, we're not yet ready
if nodes == nil || err != nil {
return false
}
if s.after != nil {
if err := s.after(ctxt, h, nodes...); err != nil {
ch <- err
}
}
}()
close(ch)
return true
}
return ch
}
@ -151,7 +128,7 @@ func (s *Selector) selAsString() string {
// QueryAfter is an action that will match the specified sel using the supplied
// query options, and after the visibility conditions of the query have been
// met, will execute f.
func QueryAfter(sel interface{}, f func(context.Context, *TargetHandler, ...*cdp.Node) error, opts ...QueryOption) Action {
func QueryAfter(sel interface{}, f func(context.Context, *Target, ...*cdp.Node) error, opts ...QueryOption) Action {
return Query(sel, append(opts, After(f))...)
}
@ -159,7 +136,7 @@ func QueryAfter(sel interface{}, f func(context.Context, *TargetHandler, ...*cdp
type QueryOption func(*Selector)
// ByFunc is a query option to set the func used to select elements.
func ByFunc(f func(context.Context, *TargetHandler, *cdp.Node) ([]cdp.NodeID, error)) QueryOption {
func ByFunc(f func(context.Context, *Target, *cdp.Node) ([]cdp.NodeID, error)) QueryOption {
return func(s *Selector) {
s.by = f
}
@ -168,7 +145,7 @@ func ByFunc(f func(context.Context, *TargetHandler, *cdp.Node) ([]cdp.NodeID, er
// ByQuery is a query option to select a single element using
// DOM.querySelector.
func ByQuery(s *Selector) {
ByFunc(func(ctxt context.Context, h *TargetHandler, n *cdp.Node) ([]cdp.NodeID, error) {
ByFunc(func(ctxt context.Context, h *Target, n *cdp.Node) ([]cdp.NodeID, error) {
nodeID, err := dom.QuerySelector(n.NodeID, s.selAsString()).Do(ctxt, h)
if err != nil {
return nil, err
@ -184,7 +161,7 @@ func ByQuery(s *Selector) {
// ByQueryAll is a query option to select elements by DOM.querySelectorAll.
func ByQueryAll(s *Selector) {
ByFunc(func(ctxt context.Context, h *TargetHandler, n *cdp.Node) ([]cdp.NodeID, error) {
ByFunc(func(ctxt context.Context, h *Target, n *cdp.Node) ([]cdp.NodeID, error) {
return dom.QuerySelectorAll(n.NodeID, s.selAsString()).Do(ctxt, h)
})(s)
}
@ -198,7 +175,7 @@ func ByID(s *Selector) {
// BySearch is a query option via DOM.performSearch (works with both CSS and
// XPath queries).
func BySearch(s *Selector) {
ByFunc(func(ctxt context.Context, h *TargetHandler, n *cdp.Node) ([]cdp.NodeID, error) {
ByFunc(func(ctxt context.Context, h *Target, n *cdp.Node) ([]cdp.NodeID, error) {
id, count, err := dom.PerformSearch(s.selAsString()).Do(ctxt, h)
if err != nil {
return nil, err
@ -224,7 +201,7 @@ func ByNodeID(s *Selector) {
panic("ByNodeID can only work on []cdp.NodeID")
}
ByFunc(func(ctxt context.Context, h *TargetHandler, n *cdp.Node) ([]cdp.NodeID, error) {
ByFunc(func(ctxt context.Context, h *Target, n *cdp.Node) ([]cdp.NodeID, error) {
for _, id := range ids {
err := dom.RequestChildNodes(id).WithPierce(true).Do(ctxt, h)
if err != nil {
@ -237,32 +214,22 @@ func ByNodeID(s *Selector) {
}
// waitReady waits for the specified nodes to be ready.
func (s *Selector) waitReady(check func(context.Context, *TargetHandler, *cdp.Node) error) func(context.Context, *TargetHandler, *cdp.Node, ...cdp.NodeID) ([]*cdp.Node, error) {
return func(ctxt context.Context, h *TargetHandler, n *cdp.Node, ids ...cdp.NodeID) ([]*cdp.Node, error) {
f, err := h.WaitFrame(ctxt, cdp.EmptyFrameID)
if err != nil {
return nil, err
}
wg := new(sync.WaitGroup)
func (s *Selector) waitReady(check func(context.Context, *Target, *cdp.Node) error) func(context.Context, *Target, *cdp.Frame, ...cdp.NodeID) ([]*cdp.Node, error) {
return func(ctxt context.Context, h *Target, cur *cdp.Frame, ids ...cdp.NodeID) ([]*cdp.Node, error) {
nodes := make([]*cdp.Node, len(ids))
errs := make([]error, len(ids))
cur.RLock()
for i, id := range ids {
wg.Add(1)
go func(i int, id cdp.NodeID) {
defer wg.Done()
nodes[i], errs[i] = h.WaitNode(ctxt, f, id)
}(i, id)
}
wg.Wait()
for _, err := range errs {
if err != nil {
return nil, err
nodes[i] = cur.Nodes[id]
if nodes[i] == nil {
cur.RUnlock()
// not yet ready
return nil, nil
}
}
cur.RUnlock()
if check != nil {
var wg sync.WaitGroup
errs := make([]error, len(nodes))
for i, n := range nodes {
wg.Add(1)
@ -285,7 +252,7 @@ func (s *Selector) waitReady(check func(context.Context, *TargetHandler, *cdp.No
}
// WaitFunc is a query option to set a custom wait func.
func WaitFunc(wait func(context.Context, *TargetHandler, *cdp.Node, ...cdp.NodeID) ([]*cdp.Node, error)) QueryOption {
func WaitFunc(wait func(context.Context, *Target, *cdp.Frame, ...cdp.NodeID) ([]*cdp.Node, error)) QueryOption {
return func(s *Selector) {
s.wait = wait
}
@ -298,7 +265,7 @@ func NodeReady(s *Selector) {
// NodeVisible is a query option to wait until the element is visible.
func NodeVisible(s *Selector) {
WaitFunc(s.waitReady(func(ctxt context.Context, h *TargetHandler, n *cdp.Node) error {
WaitFunc(s.waitReady(func(ctxt context.Context, h *Target, n *cdp.Node) error {
// check box model
_, err := dom.GetBoxModel().WithNodeID(n.NodeID).Do(ctxt, h)
if err != nil {
@ -324,7 +291,7 @@ func NodeVisible(s *Selector) {
// NodeNotVisible is a query option to wait until the element is not visible.
func NodeNotVisible(s *Selector) {
WaitFunc(s.waitReady(func(ctxt context.Context, h *TargetHandler, n *cdp.Node) error {
WaitFunc(s.waitReady(func(ctxt context.Context, h *Target, n *cdp.Node) error {
// check box model
_, err := dom.GetBoxModel().WithNodeID(n.NodeID).Do(ctxt, h)
if err != nil {
@ -350,7 +317,7 @@ func NodeNotVisible(s *Selector) {
// NodeEnabled is a query option to wait until the element is enabled.
func NodeEnabled(s *Selector) {
WaitFunc(s.waitReady(func(ctxt context.Context, h *TargetHandler, n *cdp.Node) error {
WaitFunc(s.waitReady(func(ctxt context.Context, h *Target, n *cdp.Node) error {
n.RLock()
defer n.RUnlock()
@ -366,7 +333,7 @@ func NodeEnabled(s *Selector) {
// NodeSelected is a query option to wait until the element is selected.
func NodeSelected(s *Selector) {
WaitFunc(s.waitReady(func(ctxt context.Context, h *TargetHandler, n *cdp.Node) error {
WaitFunc(s.waitReady(func(ctxt context.Context, h *Target, n *cdp.Node) error {
n.RLock()
defer n.RUnlock()
@ -380,11 +347,11 @@ func NodeSelected(s *Selector) {
}))(s)
}
// NodeNotPresent is a query option to wait until no elements match are
// present matching the selector.
// NodeNotPresent is a query option to wait until no elements are present
// matching the selector.
func NodeNotPresent(s *Selector) {
s.exp = 0
WaitFunc(func(ctxt context.Context, h *TargetHandler, n *cdp.Node, ids ...cdp.NodeID) ([]*cdp.Node, error) {
WaitFunc(func(ctxt context.Context, h *Target, cur *cdp.Frame, ids ...cdp.NodeID) ([]*cdp.Node, error) {
if len(ids) != 0 {
return nil, ErrHasResults
}
@ -402,7 +369,7 @@ func AtLeast(n int) QueryOption {
// After is a query option to set a func that will be executed after the wait
// has succeeded.
func After(f func(context.Context, *TargetHandler, ...*cdp.Node) error) QueryOption {
func After(f func(context.Context, *Target, ...*cdp.Node) error) QueryOption {
return func(s *Selector) {
s.after = f
}