| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| define("mojo/public/js/router", [ |
| "mojo/public/js/codec", |
| "mojo/public/js/core", |
| "mojo/public/js/connector", |
| "mojo/public/js/validator", |
| ], function(codec, core, connector, validator) { |
| |
| var Connector = connector.Connector; |
| var MessageReader = codec.MessageReader; |
| var Validator = validator.Validator; |
| |
| function Router(handle, connectorFactory) { |
| if (!core.isHandle(handle)) |
| throw new Error("Router constructor: Not a handle"); |
| if (connectorFactory === undefined) |
| connectorFactory = Connector; |
| this.connector_ = new connectorFactory(handle); |
| this.incomingReceiver_ = null; |
| this.nextRequestID_ = 0; |
| this.completers_ = new Map(); |
| this.payloadValidators_ = []; |
| |
| this.connector_.setIncomingReceiver({ |
| accept: this.handleIncomingMessage_.bind(this), |
| }); |
| this.connector_.setErrorHandler({ |
| onError: this.handleConnectionError_.bind(this), |
| }); |
| } |
| |
| Router.prototype.close = function() { |
| this.completers_.clear(); // Drop any responders. |
| this.connector_.close(); |
| }; |
| |
| Router.prototype.accept = function(message) { |
| this.connector_.accept(message); |
| }; |
| |
| Router.prototype.reject = function(message) { |
| // TODO(mpcomplete): no way to trasmit errors over a Connection. |
| }; |
| |
| Router.prototype.acceptAndExpectResponse = function(message) { |
| // Reserve 0 in case we want it to convey special meaning in the future. |
| var requestID = this.nextRequestID_++; |
| if (requestID == 0) |
| requestID = this.nextRequestID_++; |
| |
| message.setRequestID(requestID); |
| var result = this.connector_.accept(message); |
| if (!result) |
| return Promise.reject(Error("Connection error")); |
| |
| var completer = {}; |
| this.completers_.set(requestID, completer); |
| return new Promise(function(resolve, reject) { |
| completer.resolve = resolve; |
| completer.reject = reject; |
| }); |
| }; |
| |
| Router.prototype.setIncomingReceiver = function(receiver) { |
| this.incomingReceiver_ = receiver; |
| }; |
| |
| Router.prototype.setPayloadValidators = function(payloadValidators) { |
| this.payloadValidators_ = payloadValidators; |
| }; |
| |
| Router.prototype.encounteredError = function() { |
| return this.connector_.encounteredError(); |
| }; |
| |
| Router.prototype.handleIncomingMessage_ = function(message) { |
| var noError = validator.validationError.NONE; |
| var messageValidator = new Validator(message); |
| var err = messageValidator.validateMessageHeader(); |
| for (var i = 0; err === noError && i < this.payloadValidators_.length; ++i) |
| err = this.payloadValidators_[i](messageValidator); |
| |
| if (err == noError) |
| this.handleValidIncomingMessage_(message); |
| else |
| this.handleInvalidIncomingMessage_(message, err); |
| }; |
| |
| Router.prototype.handleValidIncomingMessage_ = function(message) { |
| if (message.expectsResponse()) { |
| if (this.incomingReceiver_) { |
| this.incomingReceiver_.acceptWithResponder(message, this); |
| } else { |
| // If we receive a request expecting a response when the client is not |
| // listening, then we have no choice but to tear down the pipe. |
| this.close(); |
| } |
| } else if (message.isResponse()) { |
| var reader = new MessageReader(message); |
| var requestID = reader.requestID; |
| var completer = this.completers_.get(requestID); |
| this.completers_.delete(requestID); |
| completer.resolve(message); |
| } else { |
| if (this.incomingReceiver_) |
| this.incomingReceiver_.accept(message); |
| } |
| } |
| |
| Router.prototype.handleInvalidIncomingMessage_ = function(message, error) { |
| this.close(); |
| } |
| |
| Router.prototype.handleConnectionError_ = function(result) { |
| this.completers_.forEach(function(value) { |
| value.reject(result); |
| }); |
| this.close(); |
| }; |
| |
| // The TestRouter subclass is only intended to be used in unit tests. |
| // It defeats valid message handling and delgates invalid message handling. |
| |
| function TestRouter(handle, connectorFactory) { |
| Router.call(this, handle, connectorFactory); |
| } |
| |
| TestRouter.prototype = Object.create(Router.prototype); |
| |
| TestRouter.prototype.handleValidIncomingMessage_ = function() { |
| }; |
| |
| TestRouter.prototype.handleInvalidIncomingMessage_ = |
| function(message, error) { |
| this.validationErrorHandler(error); |
| }; |
| |
| var exports = {}; |
| exports.Router = Router; |
| exports.TestRouter = TestRouter; |
| return exports; |
| }); |