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package wasm
import (
"context"
"errors"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/http/httptest"
"os"
"os/exec"
"regexp"
"strings"
"testing"
"time"
"github.com/chromedp/cdproto/cdp"
"github.com/chromedp/cdproto/runtime"
"github.com/chromedp/chromedp"
)
func run(cmdline string) error {
args := strings.Fields(cmdline)
return runargs(args...)
}
func runargs(args ...string) error {
cmd := exec.Command(args[0], args[1:]...)
b, err := cmd.CombinedOutput()
log.Printf("Command: %s; err=%v; full output:\n%s", strings.Join(args, " "), err, b)
if err != nil {
return err
}
return nil
}
func chromectx(timeout time.Duration) (context.Context, context.CancelFunc) {
var ctx context.Context
// looks for locally installed Chrome
ctx, _ = chromedp.NewContext(context.Background())
ctx, cancel := context.WithTimeout(ctx, timeout)
return ctx, cancel
}
func startServer(t *testing.T) (string, *httptest.Server, func()) {
// In Go 1.15, all this can be replaced by t.TempDir()
tmpDir, err := ioutil.TempDir("", "wasm_test")
if err != nil {
t.Fatalf("unable to create temp dir: %v", err)
}
fsh := http.FileServer(http.Dir(tmpDir))
h := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/wasm_exec.js" {
http.ServeFile(w, r, "../../targets/wasm_exec.js")
return
}
if r.URL.Path == "/run" {
fmt.Fprintf(w, `<!doctype html>
<html>
<head>
<title>Test</title>
<meta charset="utf-8"/>
</head>
<body>
<div id="main"></div>
<pre id="log"></pre>
<script>
window.wasmLogOutput = [];
(function() {
var logdiv = document.getElementById('log');
var cl = console.log;
console.log = function() {
var a = [];
for (var i = 0; i < arguments.length; i++) {
a.push(arguments[i]);
}
var line = a.join(' ') + "\n";
window.wasmLogOutput.push(line);
var ret = cl.apply(console, arguments)
var el = document.createElement('span');
el.innerText = line;
logdiv.appendChild(el);
return ret
}
})()
</script>
<script src="/wasm_exec.js"></script>
<script>
var wasmSupported = (typeof WebAssembly === "object");
if (wasmSupported) {
var mainWasmReq = fetch("/%s").then(function(res) {
if (res.ok) {
const go = new Go();
WebAssembly.instantiateStreaming(res, go.importObject).then((result) => {
go.run(result.instance);
});
} else {
res.text().then(function(txt) {
var el = document.getElementById("main");
el.style = 'font-family: monospace; background: black; color: red; padding: 10px';
el.innerText = txt;
})
}
})
} else {
document.getElementById("main").innerHTML = 'This application requires WebAssembly support. Please upgrade your browser.';
}
</script>
</body>
</html>`, r.FormValue("file"))
return
}
fsh.ServeHTTP(w, r)
})
server := httptest.NewServer(h)
t.Logf("Started server at %q for dir: %s", server.URL, tmpDir)
// In Go 1.14+, this can be replaced by t.Cleanup()
cleanup := func() {
err := os.RemoveAll(tmpDir)
if err != nil {
t.Error(err)
}
server.Close()
}
return tmpDir, server, cleanup
}
// waitLog blocks until the log output equals the text provided (ignoring whitespace before and after)
func waitLog(logText string) chromedp.QueryAction {
return waitInnerTextTrimEq("#log", strings.TrimSpace(logText))
}
// waitLogRe blocks until the log output matches this regular expression
func waitLogRe(restr string) chromedp.QueryAction {
return waitInnerTextMatch("#log", regexp.MustCompile(restr))
}
// waitInnerTextTrimEq will wait for the innerText of the specified element to match a specific text pattern (ignoring whitespace before and after)
func waitInnerTextTrimEq(sel string, innerText string) chromedp.QueryAction {
return waitInnerTextMatch(sel, regexp.MustCompile(`^\s*`+regexp.QuoteMeta(innerText)+`\s*$`))
}
// waitInnerTextMatch will wait for the innerText of the specified element to match a specific regexp pattern
func waitInnerTextMatch(sel string, re *regexp.Regexp) chromedp.QueryAction {
return chromedp.Query(sel, func(s *chromedp.Selector) {
chromedp.WaitFunc(func(ctx context.Context, cur *cdp.Frame, execCtx runtime.ExecutionContextID, ids ...cdp.NodeID) ([]*cdp.Node, error) {
nodes := make([]*cdp.Node, len(ids))
cur.RLock()
for i, id := range ids {
nodes[i] = cur.Nodes[id]
if nodes[i] == nil {
cur.RUnlock()
// not yet ready
return nil, nil
}
}
cur.RUnlock()
var ret string
err := chromedp.EvaluateAsDevTools("document.querySelector('"+sel+"').innerText", &ret).Do(ctx)
if err != nil {
return nodes, err
}
if !re.MatchString(ret) {
// log.Printf("found text: %s", ret)
return nodes, errors.New("unexpected value: " + ret)
}
// log.Printf("NodeValue: %#v", nodes[0])
// return nil, errors.New("not ready yet")
return nodes, nil
})(s)
})
}
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