run chromedp on Linux

[fandazhou123]

What versions are you running?

$ go list -m github.com/chromedp/chromedp
chromedp v0.8.2
$ google-chrome --version
103.0.5060.66
$ go version
go 1.16

What did you do? Include clear steps.

docker pull chromedp/headless-shell:latest
docker run -d -p 9222:9222 --rm --name headless-shell chromedp/headless-shell 

What did you expect to see?

I want to run Chromedp on Linux, so I download the Docker image of Chromedp/Headless-shell, but after installing Chrome, I get an error when running my program: exec: "google-chrome": executable file not found in $PATH.
I think my application did not find Headless-shell Chrome. How can I set my program to find it?

What did you see instead?

[ZekeLu]

Please read the doc to understand the difference between the ExecAllocator and the RemoteAllocator. In this case, you need to use the RemoteAllocator. See this comment for an example: #817 (comment)

[fandazhou123]

	ctx, cancel := chromedp.NewRemoteAllocator(context.Background(), "https://baidu.com")
	ctx, cancel = context.WithTimeout(ctx, 30*time.Second)
	ctx, cancel = chromedp.NewContext(
		ctx,
		chromedp.WithLogf(log.Printf),
	)
	defer cancel()
	var htmlContent string
	var imgBuf []byte
	err := chromedp.Run(ctx,
		chromedp.Navigate(url),
		chromedp.Sleep(5 * time.Second),
		chromedp.FullScreenshot(&imgBuf,100),
	)

I'm not sure that RemoteAllocator is the key of this issue, I try it and get an error: could not dial "https://www.baidu.com": unexpected websocket scheme: "https"

[ZekeLu]

docker run -d -p 9222:9222 --rm --name headless-shell chromedp/headless-shell

RemtoeAllocator connects to the running browser (which is chromedp/headless-shell in your case).

-	ctx, cancel := chromedp.NewRemoteAllocator(context.Background(), "https://baidu.com")
+	ctx, cancel := chromedp.NewRemoteAllocator(context.Background(), "ws://localhost:9222/")
	ctx, cancel = context.WithTimeout(ctx, 30*time.Second)
	ctx, cancel = chromedp.NewContext(
		ctx,
		chromedp.WithLogf(log.Printf),
	)
	defer cancel()
	var htmlContent string
	var imgBuf []byte
	err := chromedp.Run(ctx,
		chromedp.Navigate(url),
		chromedp.Sleep(5 * time.Second),
		chromedp.FullScreenshot(&imgBuf,100),
	)