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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | |
2 // for details. All rights reserved. Use of this source code is governed by a | |
3 // BSD-style license that can be found in the LICENSE file. | |
4 | |
5 library http.browser_client; | |
6 | |
7 import 'dart:async'; | |
8 import 'dart:html'; | |
9 import 'dart:typed_data'; | |
10 | |
11 import 'package:stack_trace/stack_trace.dart'; | |
12 | |
13 import 'src/base_client.dart'; | |
14 import 'src/base_request.dart'; | |
15 import 'src/byte_stream.dart'; | |
16 import 'src/exception.dart'; | |
17 import 'src/streamed_response.dart'; | |
18 | |
19 // TODO(nweiz): Move this under src/, re-export from lib/http.dart, and use this | |
20 // automatically from [new Client] once we can create an HttpRequest using | |
21 // mirrors on dart2js (issue 18541) and dart2js doesn't crash on pkg/collection | |
22 // (issue 18535). | |
23 | |
24 /// A `dart:html`-based HTTP client that runs in the browser and is backed by | |
25 /// XMLHttpRequests. | |
26 /// | |
27 /// This client inherits some of the limitations of XMLHttpRequest. It ignores | |
28 /// the [BaseRequest.contentLength], [BaseRequest.persistentConnection], | |
29 /// [BaseRequest.followRedirects], and [BaseRequest.maxRedirects] fields. It is | |
30 /// also unable to stream requests or responses; a request will only be sent and | |
31 /// a response will only be returned once all the data is available. | |
32 class BrowserClient extends BaseClient { | |
33 /// The currently active XHRs. | |
34 /// | |
35 /// These are aborted if the client is closed. | |
36 final _xhrs = new Set<HttpRequest>(); | |
37 | |
38 /// Creates a new HTTP client. | |
39 BrowserClient(); | |
40 | |
41 /// Sends an HTTP request and asynchronously returns the response. | |
42 Future<StreamedResponse> send(BaseRequest request) { | |
43 return request.finalize().toBytes().then((bytes) { | |
44 var xhr = new HttpRequest(); | |
45 _xhrs.add(xhr); | |
46 xhr.open(request.method, request.url.toString(), async: true); | |
47 xhr.responseType = 'blob'; | |
48 request.headers.forEach(xhr.setRequestHeader); | |
49 | |
50 var completer = new Completer(); | |
51 xhr.onLoad.first.then((_) { | |
52 // TODO(nweiz): Set the response type to "arraybuffer" when issue 18542 | |
53 // is fixed. | |
54 var blob = xhr.response == null ? new Blob([]) : xhr.response; | |
55 var reader = new FileReader(); | |
56 | |
57 reader.onLoad.first.then((_) { | |
58 var body = reader.result; | |
59 completer.complete(new StreamedResponse( | |
60 new ByteStream.fromBytes(body), | |
61 xhr.status, | |
62 contentLength: body.length, | |
63 request: request, | |
64 headers: xhr.responseHeaders, | |
65 reasonPhrase: xhr.statusText)); | |
66 }); | |
67 | |
68 reader.onError.first.then((error) { | |
69 completer.complete( | |
70 new ClientException(error.toString(), request.url), | |
71 new Chain.current()); | |
72 }); | |
73 | |
74 reader.readAsArrayBuffer(blob); | |
75 }); | |
76 | |
77 xhr.onError.first.then((error) { | |
78 completer.completeError( | |
79 new ClientException("XMLHttpRequest error.", request.url), | |
Bob Nystrom
2014/05/01 18:30:12
Probably want to include the original error here.
nweiz
2014/05/01 19:34:54
There is no original error. The parameter name is
Bob Nystrom
2014/05/01 19:52:14
Oh, heh. In that case, leave a comment explaining
nweiz
2014/05/01 20:54:11
Done.
| |
80 new Chain.current()); | |
81 }); | |
82 | |
83 xhr.send(bytes); | |
84 return completer.future.whenComplete(() => _xhrs.remove(xhr)); | |
85 }); | |
86 } | |
87 | |
88 /// Closes the client. | |
89 /// | |
90 /// This terminates all active requests. | |
91 void close() { | |
Bob Nystrom
2014/05/01 18:30:12
Stream.close() and other close() methods return Fu
nweiz
2014/05/01 19:34:54
The Client interface was created before that conve
Bob Nystrom
2014/05/01 19:52:14
SGTM.
| |
92 for (var xhr in _xhrs) { | |
93 xhr.abort(); | |
94 } | |
95 } | |
96 } | |
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