How to use DialContext method of cdp Package

Best Rod code snippet using cdp.DialContext

devtools_test.go

Source:devtools_test.go

...125func TestDevtools(t *testing.T) {126	ctx, cancel := context.WithTimeout(context.Background(), 200*time.Millisecond)127	defer cancel()128	browserWs := fmt.Sprintf("ws://%s/", srv.Listener.Addr().String())129	browserConn, err := rpcc.DialContext(ctx, browserWs)130	AssertThat(t, err, Is{nil})131	defer browserConn.Close()132	browserClient := cdp.NewClient(browserConn)133	targets, err := browserClient.Target.GetTargets(ctx)134	AssertThat(t, err, Is{nil})135	AssertThat(t, len(targets.TargetInfos), EqualTo{2})136	defaultPageWs := fmt.Sprintf("ws://%s/page", srv.Listener.Addr().String())137	defaultPageConn, err := rpcc.DialContext(ctx, defaultPageWs)138	AssertThat(t, err, Is{nil})139	defer defaultPageConn.Close()140	defaultPageClient := cdp.NewClient(defaultPageConn)141	err = defaultPageClient.Page.Enable(ctx)142	AssertThat(t, err, Is{nil})143	selectedPageWs := fmt.Sprintf("ws://%s/page/%s", srv.Listener.Addr().String(), targets.TargetInfos[1].TargetID)144	selectedPageConn, err := rpcc.DialContext(ctx, selectedPageWs)145	AssertThat(t, err, Is{nil})146	defer selectedPageConn.Close()147	selectedPageClient := cdp.NewClient(selectedPageConn)148	err = selectedPageClient.Page.Enable(ctx)149	AssertThat(t, err, Is{nil})150}151func TestDetectDevtoolsHost(t *testing.T) {152	name, _ := ioutil.TempDir("", "devtools")153	defer os.RemoveAll(name)154	profilePath := filepath.Join(name, ".org.chromium.Chromium.deadbee")155	os.MkdirAll(profilePath, os.ModePerm)156	portFile := filepath.Join(profilePath, "DevToolsActivePort")157	ioutil.WriteFile(portFile, []byte("12345\n/devtools/browser/6f37c7fe-a0a6-4346-a6e2-80c5da0687f0"), 0644)158	AssertThat(t, detectDevtoolsHost(name), EqualTo{"127.0.0.1:12345"})...

headless.go

Source:headless.go

...11// fallbackHeadlessCreateURL tries to create a new target for Headless Chrome12// that does not support the json new endpoint. A rpcc connection is established13// to the "/devtools/browser" endpoint and "Target.createTarget" is issued.14func fallbackHeadlessCreateURL(ctx context.Context, d *DevTools, openURL string) (*Target, error) {15	// Context must be set, rpcc DialContext panics on nil context.16	if ctx == nil {17		ctx = context.Background()18	}19	// Headless Chrome requires a non-empty URL for CreateTarget.20	if openURL == "" {21		openURL = "about:blank"22	}23	wsURL := "ws://" + httpRe.ReplaceAllString(d.url, "") + "/devtools/browser"24	conn, err := rpcc.DialContext(ctx, wsURL)25	if err != nil {26		return nil, err27	}28	defer conn.Close()29	c := cdp.NewClient(conn)30	t, err := c.Target.CreateTarget(ctx, target.NewCreateTargetArgs(openURL))31	if err != nil {32		return nil, err33	}34	// List must be called after CreateTarget (headless bug):35	// https://bugs.chromium.org/p/chromium/issues/detail?id=70450336	list, err := d.List(ctx)37	if err != nil {38		return nil, err...

DialContext

Using AI Code Generation

1import (2func main() {3	ctx, cancel := chromedp.NewContext(context.Background())4	defer cancel()5	ctx, cancel = context.WithTimeout(ctx, 15*time.Second)6	defer cancel()7	err := chromedp.Run(ctx,8		chromedp.WaitVisible(`#main`, chromedp.ByID),9		chromedp.WaitReady(`#main`, chromedp.ByID),10		chromedp.OuterHTML(`html`, &res, chromedp.ByQuery),11	if err != nil {12		log.Fatal(err)13	}14	log.Printf("html: %s", res)15}

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