1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/* -*- 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/. */
"use strict";
var EXPORTED_SYMBOLS = ["ControllerStateMachine"];
const { CommandType, State } = ChromeUtils.import(
"resource://gre/modules/presentation/StateMachineHelper.jsm"
);
const DEBUG = false;
function debug(str) {
dump("-*- ControllerStateMachine: " + str + "\n");
}
var handlers = [
function _initHandler(stateMachine, command) {
// shouldn't receive any command at init state.
DEBUG && debug("unexpected command: " + JSON.stringify(command));
},
function _connectingHandler(stateMachine, command) {
switch (command.type) {
case CommandType.CONNECT_ACK:
stateMachine.state = State.CONNECTED;
stateMachine._notifyDeviceConnected();
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_ACK:
stateMachine._notifyLaunch(command.presentationId);
break;
case CommandType.TERMINATE:
stateMachine._notifyTerminate(command.presentationId);
break;
case CommandType.TERMINATE_ACK:
stateMachine._notifyTerminate(command.presentationId);
break;
case CommandType.ANSWER:
case CommandType.ICE_CANDIDATE:
stateMachine._notifyChannelDescriptor(command);
break;
case CommandType.RECONNECT_ACK:
stateMachine._notifyReconnect(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));
},
];
function ControllerStateMachine(channel, deviceId) {
this.state = State.INIT;
this._channel = channel;
this._deviceId = deviceId;
}
ControllerStateMachine.prototype = {
launch: function _launch(presentationId, url) {
if (this.state === State.CONNECTED) {
this._sendCommand({
type: CommandType.LAUNCH,
presentationId,
url,
});
}
},
terminate: function _terminate(presentationId) {
if (this.state === State.CONNECTED) {
this._sendCommand({
type: CommandType.TERMINATE,
presentationId,
});
}
},
terminateAck: function _terminateAck(presentationId) {
if (this.state === State.CONNECTED) {
this._sendCommand({
type: CommandType.TERMINATE_ACK,
presentationId,
});
}
},
reconnect: function _reconnect(presentationId, url) {
if (this.state === State.CONNECTED) {
this._sendCommand({
type: CommandType.RECONNECT,
presentationId,
url,
});
}
},
sendOffer: function _sendOffer(offer) {
if (this.state === State.CONNECTED) {
this._sendCommand({
type: CommandType.OFFER,
offer,
});
}
},
sendAnswer: function _sendAnswer() {
// answer can only be sent by presenting UA.
debug("controller shouldn't generate answer");
},
updateIceCandidate: function _updateIceCandidate(candidate) {
if (this.state === State.CONNECTED) {
this._sendCommand({
type: CommandType.ICE_CANDIDATE,
candidate,
});
}
},
onCommand: function _onCommand(command) {
handlers[this.state](this, command);
},
onChannelReady: function _onChannelReady() {
if (this.state === State.INIT) {
this._sendCommand({
type: CommandType.CONNECT,
deviceId: this._deviceId,
});
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,
});
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);
}
break;
default:
DEBUG &&
debug("unexpected channel close: " + reason + ", " + isByRemote);
break;
}
},
_sendCommand: function _sendCommand(command) {
this._channel.sendCommand(command);
},
_notifyDeviceConnected: function _notifyDeviceConnected() {
// XXX trigger following command
this._channel.notifyDeviceConnected();
},
_notifyDisconnected: function _notifyDisconnected(reason) {
this._channel.notifyDisconnected(reason);
},
_notifyLaunch: function _notifyLaunch(presentationId) {
this._channel.notifyLaunch(presentationId);
},
_notifyTerminate: function _notifyTerminate(presentationId) {
this._channel.notifyTerminate(presentationId);
},
_notifyReconnect: function _notifyReconnect(presentationId) {
this._channel.notifyReconnect(presentationId);
},
_notifyChannelDescriptor: function _notifyChannelDescriptor(command) {
switch (command.type) {
case CommandType.ANSWER:
this._channel.notifyAnswer(command.answer);
break;
case CommandType.ICE_CANDIDATE:
this._channel.notifyIceCandidate(command.candidate);
break;
}
},
};
|
