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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", [
"console",
"mojo/public/js/codec",
"mojo/public/js/core",
"mojo/public/js/connector",
"mojo/public/js/lib/control_message_handler",
"mojo/public/js/validator",
], function(console, codec, core, connector, controlMessageHandler, validator) {
var Connector = connector.Connector;
var MessageReader = codec.MessageReader;
var Validator = validator.Validator;
var ControlMessageHandler = controlMessageHandler.ControlMessageHandler;
function Router(handle, interface_version, 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.errorHandler_ = null;
this.nextRequestID_ = 0;
this.completers_ = new Map();
this.payloadValidators_ = [];
this.testingController_ = null;
if (interface_version !== undefined) {
this.controlMessageHandler_ = new
ControlMessageHandler(interface_version);
}
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();
this.testingController_ = null;
};
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.setErrorHandler = function(handler) {
this.errorHandler_ = handler;
};
Router.prototype.encounteredError = function() {
return this.connector_.encounteredError();
};
Router.prototype.enableTestingMode = function() {
this.testingController_ = new RouterTestingController(this.connector_);
return this.testingController_;
};
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 (this.testingController_)
return;
if (message.expectsResponse()) {
if (controlMessageHandler.isControlMessage(message)) {
if (this.controlMessageHandler_) {
this.controlMessageHandler_.acceptWithResponder(message, this);
} else {
this.close();
}
} else 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);
if (completer) {
this.completers_.delete(requestID);
completer.resolve(message);
} else {
console.log("Unexpected response with request ID: " + requestID);
}
} else {
if (controlMessageHandler.isControlMessage(message)) {
if (this.controlMessageHandler_) {
var ok = this.controlMessageHandler_.accept(message);
if (ok) return;
}
this.close();
} else if (this.incomingReceiver_) {
this.incomingReceiver_.accept(message);
}
}
};
Router.prototype.handleInvalidIncomingMessage_ = function(message, error) {
if (!this.testingController_) {
// TODO(yzshen): Consider notifying the embedder.
// TODO(yzshen): This should also trigger connection error handler.
// Consider making accept() return a boolean and let the connector deal
// with this, as the C++ code does.
console.log("Invalid message: " + validator.validationError[error]);
this.close();
return;
}
this.testingController_.onInvalidIncomingMessage(error);
};
Router.prototype.handleConnectionError_ = function(result) {
this.completers_.forEach(function(value) {
value.reject(result);
});
if (this.errorHandler_)
this.errorHandler_();
this.close();
};
// The RouterTestingController is used in unit tests. It defeats valid message
// handling and delgates invalid message handling.
function RouterTestingController(connector) {
this.connector_ = connector;
this.invalidMessageHandler_ = null;
}
RouterTestingController.prototype.waitForNextMessage = function() {
this.connector_.waitForNextMessageForTesting();
};
RouterTestingController.prototype.setInvalidIncomingMessageHandler =
function(callback) {
this.invalidMessageHandler_ = callback;
};
RouterTestingController.prototype.onInvalidIncomingMessage =
function(error) {
if (this.invalidMessageHandler_)
this.invalidMessageHandler_(error);
};
var exports = {};
exports.Router = Router;
return exports;
});
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