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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* jshint esnext:true, globalstrict:true, moz:true, undef:true, unused:true */
/* globals Components, dump */
"use strict";
this.EXPORTED_SYMBOLS = ["ReceiverStateMachine"]; // jshint ignore:line
const { utils: Cu } = Components;
/* globals State, CommandType */
Cu.import("resource://gre/modules/presentation/StateMachineHelper.jsm");
const DEBUG = false;
function debug(str) {
dump("-*- ReceiverStateMachine: " + str + "\n");
}
var handlers = [
function _initHandler(stateMachine, command) {
// shouldn't receive any command at init state
DEBUG && debug("unexpected command: " + JSON.stringify(command)); // jshint ignore:line
},
function _connectingHandler(stateMachine, command) {
switch (command.type) {
case CommandType.CONNECT:
stateMachine._sendCommand({
type: CommandType.CONNECT_ACK
});
stateMachine.state = State.CONNECTED;
stateMachine._notifyDeviceConnected(command.deviceId);
break;
case CommandType.DISCONNECT:
stateMachine.state = State.CLOSED;
stateMachine._notifyDisconnected(command.reason);
break;
default:
debug("unexpected command: " + JSON.stringify(command));
// ignore unexpected command
break;
}
},
function _connectedHandler(stateMachine, command) {
switch (command.type) {
case CommandType.DISCONNECT:
stateMachine.state = State.CLOSED;
stateMachine._notifyDisconnected(command.reason);
break;
case CommandType.LAUNCH:
stateMachine._notifyLaunch(command.presentationId,
command.url);
stateMachine._sendCommand({
type: CommandType.LAUNCH_ACK,
presentationId: command.presentationId
});
break;
case CommandType.TERMINATE:
stateMachine._notifyTerminate(command.presentationId);
break;
case CommandType.TERMINATE_ACK:
stateMachine._notifyTerminate(command.presentationId);
break;
case CommandType.OFFER:
case CommandType.ICE_CANDIDATE:
stateMachine._notifyChannelDescriptor(command);
break;
case CommandType.RECONNECT:
stateMachine._notifyReconnect(command.presentationId,
command.url);
stateMachine._sendCommand({
type: CommandType.RECONNECT_ACK,
presentationId: command.presentationId
});
break;
default:
debug("unexpected command: " + JSON.stringify(command));
// ignore unexpected command
break;
}
},
function _closingHandler(stateMachine, command) {
switch (command.type) {
case CommandType.DISCONNECT:
stateMachine.state = State.CLOSED;
stateMachine._notifyDisconnected(command.reason);
break;
default:
debug("unexpected command: " + JSON.stringify(command));
// ignore unexpected command
break;
}
},
function _closedHandler(stateMachine, command) {
// ignore every command in closed state.
DEBUG && debug("unexpected command: " + JSON.stringify(command)); // jshint ignore:line
},
];
function ReceiverStateMachine(channel) {
this.state = State.INIT;
this._channel = channel;
}
ReceiverStateMachine.prototype = {
launch: function _launch() {
// presentation session can only be launched by controlling UA.
debug("receiver shouldn't trigger launch");
},
terminate: function _terminate(presentationId) {
if (this.state === State.CONNECTED) {
this._sendCommand({
type: CommandType.TERMINATE,
presentationId: presentationId,
});
}
},
terminateAck: function _terminateAck(presentationId) {
if (this.state === State.CONNECTED) {
this._sendCommand({
type: CommandType.TERMINATE_ACK,
presentationId: presentationId,
});
}
},
reconnect: function _reconnect() {
debug("receiver shouldn't trigger reconnect");
},
sendOffer: function _sendOffer() {
// offer can only be sent by controlling UA.
debug("receiver shouldn't generate offer");
},
sendAnswer: function _sendAnswer(answer) {
if (this.state === State.CONNECTED) {
this._sendCommand({
type: CommandType.ANSWER,
answer: answer,
});
}
},
updateIceCandidate: function _updateIceCandidate(candidate) {
if (this.state === State.CONNECTED) {
this._sendCommand({
type: CommandType.ICE_CANDIDATE,
candidate: candidate,
});
}
},
onCommand: function _onCommand(command) {
handlers[this.state](this, command);
},
onChannelReady: function _onChannelReady() {
if (this.state === State.INIT) {
this.state = State.CONNECTING;
}
},
onChannelClosed: function _onChannelClose(reason, isByRemote) {
switch (this.state) {
case State.CONNECTED:
if (isByRemote) {
this.state = State.CLOSED;
this._notifyDisconnected(reason);
} else {
this._sendCommand({
type: CommandType.DISCONNECT,
reason: reason
});
this.state = State.CLOSING;
this._closeReason = reason;
}
break;
case State.CLOSING:
if (isByRemote) {
this.state = State.CLOSED;
if (this._closeReason) {
reason = this._closeReason;
delete this._closeReason;
}
this._notifyDisconnected(reason);
} else {
// do nothing and wait for remote channel closed.
}
break;
default:
DEBUG && debug("unexpected channel close: " + reason + ", " + isByRemote); // jshint ignore:line
break;
}
},
_sendCommand: function _sendCommand(command) {
this._channel.sendCommand(command);
},
_notifyDeviceConnected: function _notifyDeviceConnected(deviceName) {
this._channel.notifyDeviceConnected(deviceName);
},
_notifyDisconnected: function _notifyDisconnected(reason) {
this._channel.notifyDisconnected(reason);
},
_notifyLaunch: function _notifyLaunch(presentationId, url) {
this._channel.notifyLaunch(presentationId, url);
},
_notifyTerminate: function _notifyTerminate(presentationId) {
this._channel.notifyTerminate(presentationId);
},
_notifyReconnect: function _notifyReconnect(presentationId, url) {
this._channel.notifyReconnect(presentationId, url);
},
_notifyChannelDescriptor: function _notifyChannelDescriptor(command) {
switch (command.type) {
case CommandType.OFFER:
this._channel.notifyOffer(command.offer);
break;
case CommandType.ICE_CANDIDATE:
this._channel.notifyIceCandidate(command.candidate);
break;
}
},
};
this.ReceiverStateMachine = ReceiverStateMachine; // jshint ignore:line
|
