Scriptable, headless WebKit with a Go API. Like PhantomJS, but for Go. Render static HTML versions of dynamic JavaScript applications, automate browsing, run arbitrary JavaScript in a browser window context, etc., all from Go or the command line.

• Documentation on Sourcegraph

• Go >= 1.2rc1 (due to #3250)
• WebKitGTK+ >= 2.0.0
• go-webkit2

For instructions on installing these dependencies, see the go-webkit2 README.

To install WebLoop, run: go get github.com/sourcegraph/webloop/...

The included command static-reverse-proxy proxies a dynamic JavaScript application and serves an equivalent statically rendered HTML website to clients. Run it with:

$ go install github.com/sourcegraph/webloop/... $ static-reverse-proxy 

For example, to proxy a dynamic application at http://example.com and serve an equivalent statically rendered HTML website on http://localhost:13000, run:

$ static-reverse-proxy -target=http://example.com -http=:13000 

Run with -h to see more information.

StaticRenderer is an HTTP handler that serves a static HTML version of a dynamic web application. Use it like:

staticHandler := &webloop.StaticRenderer{ TargetBaseURL: "http://dynamic-app.example.com", WaitTimeout: time.Second * 3, ReturnUnfinishedPages: true } http.Handle("/", staticHandler)

See the examples/angular-static-seo/ directory for example code. Run the included binary with:

$ go run examples/angular-static-seo/server.go 

Instructions will be printed for accessing the 2 local demo HTTP servers. Run with -h to see more information.

package webloop_test import ( "fmt" "os" "runtime" "github.com/gotk3/gotk3/gtk" "github.com/sourcegraph/webloop" ) func Example() { gtk.Init(nil) go func() { runtime.LockOSThread() gtk.Main()	}() ctx := webloop.New() view := ctx.NewView() defer view.Close() view.Open("http://google.com") err := view.Wait() if err != nil { fmt.Fprintf(os.Stderr, "Failed to load URL: %s", err) os.Exit(1)	} res, err := view.EvaluateJavaScript("document.title") if err != nil { fmt.Fprintf(os.Stderr, "Failed to run JavaScript: %s", err) os.Exit(1)	} fmt.Printf("JavaScript returned: %q\n", res) // output: // JavaScript returned: "Google" }

See webloop_test.go for more examples.

• Set up CI testing. This is difficult because all of the popular CI services run older versions of Ubuntu that make it difficult to install WebKitGTK+ >= 2.0.0.
• Add the ability for JavaScript code to send messages to WebLoop, similar to [PhantomJS's callPhantom] (https://github.com/ariya/phantomjs/wiki/API-Reference-WebPage#oncallback) mechanism.

• WebLoop is used to render static HTML pages on Sourcegraph for search engine crawlers

See the AUTHORS file for a list of contributors.

Submit contributions via GitHub pull request. Patches should include tests and should pass golint.