Package chromedp is a faster, simpler way to drive browsers supporting the Chrome DevTools Protocol in Go without external dependencies (like Selenium or PhantomJS).
Install in the usual Go way:
go get -u github.com/chromedp/chromedp
Refer to the GoDoc page for the documentation and examples. Additionally, the examples repository contains more complex examples.
I can't see any Chrome browser window
By default, Chrome is run in headless mode. See DefaultExecAllocatorOptions, and
an example
to override the default options.
I'm seeing "context canceled" errors
When the connection to the browser is lost, chromedp cancels the context, and
it may result in this error. This occurs, for example, if the browser is closed
manually, or if the browser process has been killed or otherwise terminated.
Chrome exits as soon as my Go program finishes
On Linux, chromedp is configured to avoid leaking resources by force-killing
any started Chrome child processes. If you need to launch a long-running Chrome
instance, manually start Chrome and connect using RemoteAllocator.
Executing an action without
Runresults in "invalid context"
By default, a chromedp context does not have an executor, however one can be
specified manually if necessary; see issue #326
for an example.
I can't use an
ActionwithRunbecause it returns many values
Wrap it with an ActionFunc:
chromedp.Run(ctx, chromedp.ActionFunc(func(ctx context.Context) error {
_, err := domain.SomeAction().Do(ctx)
return err
}))I want to use chromedp on a headless environment
The simplest way is to run the Go program that uses chromedp inside the
chromedp/headless-shell image. That image contains headless-shell, a
smaller headless build of Chrome, which chromedp is able to find out of the
box.
- chromedp: A New Way to Drive the Web - GopherCon SG 2017 talk
- Chrome DevTools Protocol - Chrome DevTools Protocol Domain documentation
- chromedp examples - various
chromedpexamples github.com/chromedp/cdproto- GoDoc listing for the CDP domains used bychromedpgithub.com/chromedp/cdproto-gen- tool used to generatecdprotogithub.com/chromedp/chromedp-proxy- a simple CDP proxy for logging CDP clients and browsers