| 388 | } |
| 389 | |
| 390 | func openFile(url string) (io.ReadCloser, error) { |
| 391 | if Headless() { // Headless would be node.js |
| 392 | return os.Open(url) |
| 393 | } |
| 394 | var err error |
| 395 | var resp js.Value |
| 396 | ch := make(chan struct{}) |
| 397 | req := js.Global().Get("XMLHttpRequest").New() |
| 398 | req.Call("open", "GET", url, true) |
| 399 | req.Set("responseType", "arraybuffer") |
| 400 | loadf := js.FuncOf(func(this js.Value, args []js.Value) interface{} { |
| 401 | defer close(ch) |
| 402 | status := req.Get("status").Int() |
| 403 | if 200 <= status && status < 400 { |
| 404 | resp = req.Get("response") |
| 405 | return nil |
| 406 | } |
| 407 | err = errors.New(fmt.Sprintf("http error: %d", status)) |
| 408 | return nil |
| 409 | }) |
| 410 | defer loadf.Release() |
| 411 | req.Call("addEventListener", "load", loadf) |
| 412 | errorf := js.FuncOf(func(this js.Value, args []js.Value) interface{} { |
| 413 | defer close(ch) |
| 414 | err = errors.New(fmt.Sprintf("XMLHttpRequest error: %s", req.Get("statusText").String())) |
| 415 | return nil |
| 416 | }) |
| 417 | req.Call("addEventListener", "error", errorf) |
| 418 | defer errorf.Release() |
| 419 | req.Call("send") |
| 420 | t := time.NewTicker(time.Duration(int(time.Second) * 10)) |
| 421 | select { |
| 422 | case <-ch: |
| 423 | if err != nil { |
| 424 | return nil, err |
| 425 | } |
| 426 | buf := make([]byte, resp.Get("byteLength").Int()) |
| 427 | js.CopyBytesToGo(buf, js.Global().Get("Uint8Array").New(resp)) |
| 428 | f := &noCloseReadCloser{bytes.NewReader(buf)} |
| 429 | return f, nil |
| 430 | case <-t.C: |
| 431 | return nil, errors.New("Did not recieve a response in 10 seconds.") |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | type noCloseReadCloser struct { |
| 436 | r io.Reader |