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// 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;
});
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