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Side by Side Diff: mojo/public/js/router.js

Issue 814543006: Move //mojo/{public, edk} underneath //third_party (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase Created 5 years, 11 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 define("mojo/public/js/router", [
6 "mojo/public/js/codec",
7 "mojo/public/js/core",
8 "mojo/public/js/connector",
9 "mojo/public/js/validator",
10 ], function(codec, core, connector, validator) {
11
12 var Connector = connector.Connector;
13 var MessageReader = codec.MessageReader;
14 var Validator = validator.Validator;
15
16 function Router(handle, connectorFactory) {
17 if (!core.isHandle(handle))
18 throw new Error("Router constructor: Not a handle");
19 if (connectorFactory === undefined)
20 connectorFactory = Connector;
21 this.connector_ = new connectorFactory(handle);
22 this.incomingReceiver_ = null;
23 this.nextRequestID_ = 0;
24 this.completers_ = new Map();
25 this.payloadValidators_ = [];
26
27 this.connector_.setIncomingReceiver({
28 accept: this.handleIncomingMessage_.bind(this),
29 });
30 this.connector_.setErrorHandler({
31 onError: this.handleConnectionError_.bind(this),
32 });
33 }
34
35 Router.prototype.close = function() {
36 this.completers_.clear(); // Drop any responders.
37 this.connector_.close();
38 };
39
40 Router.prototype.accept = function(message) {
41 this.connector_.accept(message);
42 };
43
44 Router.prototype.reject = function(message) {
45 // TODO(mpcomplete): no way to trasmit errors over a Connection.
46 };
47
48 Router.prototype.acceptAndExpectResponse = function(message) {
49 // Reserve 0 in case we want it to convey special meaning in the future.
50 var requestID = this.nextRequestID_++;
51 if (requestID == 0)
52 requestID = this.nextRequestID_++;
53
54 message.setRequestID(requestID);
55 var result = this.connector_.accept(message);
56 if (!result)
57 return Promise.reject(Error("Connection error"));
58
59 var completer = {};
60 this.completers_.set(requestID, completer);
61 return new Promise(function(resolve, reject) {
62 completer.resolve = resolve;
63 completer.reject = reject;
64 });
65 };
66
67 Router.prototype.setIncomingReceiver = function(receiver) {
68 this.incomingReceiver_ = receiver;
69 };
70
71 Router.prototype.setPayloadValidators = function(payloadValidators) {
72 this.payloadValidators_ = payloadValidators;
73 };
74
75 Router.prototype.encounteredError = function() {
76 return this.connector_.encounteredError();
77 };
78
79 Router.prototype.handleIncomingMessage_ = function(message) {
80 var noError = validator.validationError.NONE;
81 var messageValidator = new Validator(message);
82 var err = messageValidator.validateMessageHeader();
83 for (var i = 0; err === noError && i < this.payloadValidators_.length; ++i)
84 err = this.payloadValidators_[i](messageValidator);
85
86 if (err == noError)
87 this.handleValidIncomingMessage_(message);
88 else
89 this.handleInvalidIncomingMessage_(message, err);
90 };
91
92 Router.prototype.handleValidIncomingMessage_ = function(message) {
93 if (message.expectsResponse()) {
94 if (this.incomingReceiver_) {
95 this.incomingReceiver_.acceptWithResponder(message, this);
96 } else {
97 // If we receive a request expecting a response when the client is not
98 // listening, then we have no choice but to tear down the pipe.
99 this.close();
100 }
101 } else if (message.isResponse()) {
102 var reader = new MessageReader(message);
103 var requestID = reader.requestID;
104 var completer = this.completers_.get(requestID);
105 this.completers_.delete(requestID);
106 completer.resolve(message);
107 } else {
108 if (this.incomingReceiver_)
109 this.incomingReceiver_.accept(message);
110 }
111 }
112
113 Router.prototype.handleInvalidIncomingMessage_ = function(message, error) {
114 this.close();
115 }
116
117 Router.prototype.handleConnectionError_ = function(result) {
118 this.completers_.forEach(function(value) {
119 value.reject(result);
120 });
121 this.close();
122 };
123
124 // The TestRouter subclass is only intended to be used in unit tests.
125 // It defeats valid message handling and delgates invalid message handling.
126
127 function TestRouter(handle, connectorFactory) {
128 Router.call(this, handle, connectorFactory);
129 }
130
131 TestRouter.prototype = Object.create(Router.prototype);
132
133 TestRouter.prototype.handleValidIncomingMessage_ = function() {
134 };
135
136 TestRouter.prototype.handleInvalidIncomingMessage_ =
137 function(message, error) {
138 this.validationErrorHandler(error);
139 };
140
141 var exports = {};
142 exports.Router = Router;
143 exports.TestRouter = TestRouter;
144 return exports;
145 });
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