1decbccd74
That way, we avoid the racy map access via Browser.executorForTarget. If a context is attached to a target, the Target field must be non-nil. The Browser.pages map is still racy, since multiple tabs can be created concurrently; we'll fix this other data race in another commit.
112 lines
2.4 KiB
Go
112 lines
2.4 KiB
Go
package chromedp_test
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import (
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"bytes"
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"context"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/chromedp/chromedp"
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)
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func ExampleTitle() {
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ctx, cancel := chromedp.NewContext(context.Background())
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defer cancel()
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var title string
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if err := chromedp.Run(ctx, chromedp.Tasks{
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chromedp.Navigate("https://github.com/chromedp/chromedp/issues"),
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chromedp.WaitVisible("#start-of-content", chromedp.ByID),
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chromedp.Title(&title),
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}); err != nil {
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panic(err)
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}
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fmt.Println(title)
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// wait for the resources to be cleaned up
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cancel()
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chromedp.FromContext(ctx).Allocator.Wait()
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// no expected output, to not run this test as part of 'go test'; it's
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// too slow, requiring internet access.
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}
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func ExampleExecAllocatorOption() {
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dir, err := ioutil.TempDir("", "chromedp-example")
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if err != nil {
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panic(err)
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}
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defer os.RemoveAll(dir)
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opts := []chromedp.ExecAllocatorOption{
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chromedp.NoFirstRun,
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chromedp.NoDefaultBrowserCheck,
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chromedp.Headless,
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chromedp.DisableGPU,
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chromedp.UserDataDir(dir),
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}
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allocCtx, cancel := chromedp.NewAllocator(context.Background(),
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chromedp.WithExecAllocator(opts...))
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defer cancel()
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taskCtx, cancel := chromedp.NewContext(allocCtx)
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defer cancel()
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// ensure that the browser process is started
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if err := chromedp.Run(taskCtx, chromedp.Tasks{}); err != nil {
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panic(err)
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}
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path := filepath.Join(dir, "DevToolsActivePort")
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bs, err := ioutil.ReadFile(path)
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if err != nil {
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panic(err)
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}
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lines := bytes.Split(bs, []byte("\n"))
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fmt.Printf("DevToolsActivePort has %d lines\n", len(lines))
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// wait for the resources to be cleaned up
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cancel()
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chromedp.FromContext(allocCtx).Allocator.Wait()
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// Output:
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// DevToolsActivePort has 2 lines
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}
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func ExampleManyTabs() {
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// new browser, first tab
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ctx1, cancel := chromedp.NewContext(context.Background())
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defer cancel()
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// ensure the first tab is created
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if err := chromedp.Run(ctx1, chromedp.Tasks{}); err != nil {
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panic(err)
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}
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// same browser, second tab
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ctx2, _ := chromedp.NewContext(ctx1)
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// ensure the second tab is created
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if err := chromedp.Run(ctx2, chromedp.Tasks{}); err != nil {
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panic(err)
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}
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c1 := chromedp.FromContext(ctx1)
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c2 := chromedp.FromContext(ctx2)
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fmt.Printf("Same browser: %t\n", c1.Browser == c2.Browser)
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fmt.Printf("Same tab: %t\n", c1.Target == c2.Target)
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// wait for the resources to be cleaned up
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cancel()
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c1.Allocator.Wait()
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// Output:
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// Same browser: true
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// Same tab: false
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}
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