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Example of using chromedp to prerender a create-react-app frontend using fake SSR via chrome headless
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package main | |
import ( | |
"context" | |
"io/ioutil" | |
"log" | |
"strings" | |
"testing" | |
"github.com/chromedp/cdproto/dom" | |
"github.com/chromedp/chromedp" | |
) | |
func TestSSRofCRA(t *testing.T) { | |
// create context, this would come from client if using HTTP | |
ctx, cancel := chromedp.NewContext(context.Background()) | |
defer cancel() | |
// create-react-app uses port 3000 by default | |
var res string | |
err := chromedp.Run(ctx, scrapIt("http://localhost:3000/", &res)) | |
if err != nil { | |
t.Fatal(err) | |
} | |
ioutil.WriteFile("rendered.html", []byte(res), 0664) | |
log.Println(strings.TrimSpace(res)) | |
} | |
func scrapIt(url string, str *string) chromedp.Tasks { | |
return chromedp.Tasks{ | |
chromedp.Navigate(url), | |
chromedp.ActionFunc(func(ctx context.Context) error { | |
node, err := dom.GetDocument().Do(ctx) | |
if err != nil { | |
return err | |
} | |
*str, err = dom.GetOuterHTML().WithNodeID(node.NodeID).Do(ctx) | |
return err | |
}), | |
} | |
} | |
// Alternative, less-stable fetch using chrome directly | |
// out, err := exec.Command("sh", "-c", "/root/tools/chromium-latest-linux/latest/chrome --headless --no-sandbox --dump-dom "+url).Output() | |
// if err != nil { | |
// log.Fatal(err) | |
// } | |
// fmt.Printf("%s\n", out) |
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