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
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
/*
* Copyright (C) 2020 Yomichan Authors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
class CrossFrameAPIPort extends EventDispatcher {
constructor(otherFrameId, port, messageHandlers) {
super();
this._otherFrameId = otherFrameId;
this._port = port;
this._messageHandlers = messageHandlers;
this._activeInvocations = new Map();
this._invocationId = 0;
this._eventListeners = new EventListenerCollection();
}
get otherFrameId() {
return this._otherFrameId;
}
prepare() {
this._eventListeners.addListener(this._port.onDisconnect, this._onDisconnect.bind(this));
this._eventListeners.addListener(this._port.onMessage, this._onMessage.bind(this));
}
invoke(action, params, ackTimeout, responseTimeout) {
return new Promise((resolve, reject) => {
if (this._port === null) {
reject(new Error('Port is disconnected'));
return;
}
const id = this._invocationId++;
const invocation = {id, resolve, reject, responseTimeout, ack: false, timer: null};
this._activeInvocations.set(id, invocation);
if (ackTimeout !== null) {
try {
invocation.timer = setTimeout(() => this._onError(id, new Error('Timeout (ack)')), ackTimeout);
} catch (e) {
this._onError(id, new Error('Failed to set timeout'));
return;
}
}
try {
this._port.postMessage({type: 'invoke', id, data: {action, params}});
} catch (e) {
this._onError(id, e);
}
});
}
disconnect() {
this._onDisconnect();
}
// Private
_onDisconnect() {
if (this._port === null) { return; }
this._eventListeners.removeAllEventListeners();
this._port = null;
for (const id of this._activeInvocations.keys()) {
this._onError(id, new Error('Disconnected'));
}
this.trigger('disconnect', this);
}
_onMessage({type, id, data}) {
switch (type) {
case 'invoke':
this._onInvoke(id, data);
break;
case 'ack':
this._onAck(id);
break;
case 'result':
this._onResult(id, data);
break;
}
}
// Response handlers
_onAck(id) {
const invocation = this._activeInvocations.get(id);
if (typeof invocation === 'undefined') {
yomichan.logWarning(new Error(`Request ${id} not found for ack`));
return;
}
if (invocation.ack) {
this._onError(id, new Error(`Request ${id} already ack'd`));
return;
}
invocation.ack = true;
if (invocation.timer !== null) {
clearTimeout(invocation.timer);
invocation.timer = null;
}
const responseTimeout = invocation.responseTimeout;
if (responseTimeout !== null) {
try {
invocation.timer = setTimeout(() => this._onError(id, new Error('Timeout (response)')), responseTimeout);
} catch (e) {
this._onError(id, new Error('Failed to set timeout'));
}
}
}
_onResult(id, data) {
const invocation = this._activeInvocations.get(id);
if (typeof invocation === 'undefined') {
yomichan.logWarning(new Error(`Request ${id} not found`));
return;
}
if (!invocation.ack) {
this._onError(id, new Error(`Request ${id} not ack'd`));
return;
}
this._activeInvocations.delete(id);
if (invocation.timer !== null) {
clearTimeout(invocation.timer);
invocation.timer = null;
}
const error = data.error;
if (typeof error !== 'undefined') {
invocation.reject(jsonToError(error));
} else {
invocation.resolve(data.result);
}
}
_onError(id, error) {
const invocation = this._activeInvocations.get(id);
if (typeof invocation === 'undefined') { return; }
this._activeInvocations.delete(id);
if (invocation.timer !== null) {
clearTimeout(invocation.timer);
invocation.timer = null;
}
invocation.reject(error);
}
// Invocation
_onInvoke(id, {action, params}) {
const callback = (response) => this._sendResponse({type: 'result', id, data: response});
const messageHandler = this._messageHandlers.get(action);
if (typeof messageHandler === 'undefined') {
callback({error: new Error(`Unknown action: ${action}`)});
return false;
}
this._sendAck(id);
return yomichan.invokeMessageHandler(messageHandler, params, callback);
}
_sendResponse(data) {
if (this._port === null) { return; }
try {
this._port.postMessage(data);
} catch (e) {
// NOP
}
}
_sendAck(id) {
this._sendResponse({type: 'ack', id});
}
_sendResult(id, result) {
this._sendResponse({type: 'result', id, data: {result}});
}
_sendError(id, error) {
this._sendResponse({type: 'result', id, data: {error: errorToJson(error)}});
}
}
class CrossFrameAPI {
constructor() {
this._ackTimeout = 3000; // 3 seconds
this._responseTimeout = 10000; // 10 seconds
this._commPorts = new Map();
this._messageHandlers = new Map();
this._onDisconnectBind = this._onDisconnect.bind(this);
}
prepare() {
chrome.runtime.onConnect.addListener(this._onConnect.bind(this));
}
async invoke(targetFrameId, action, params={}) {
const commPort = this._getOrCreateCommPort(targetFrameId);
return await commPort.invoke(action, params, this._ackTimeout, this._responseTimeout);
}
registerHandlers(messageHandlers) {
for (const [key, value] of messageHandlers) {
if (this._messageHandlers.has(key)) {
throw new Error(`Handler ${key} is already registered`);
}
this._messageHandlers.set(key, value);
}
}
_onConnect(port) {
const match = /^cross-frame-communication-port-(\d+)$/.exec(`${port.name}`);
if (match === null) { return; }
const otherFrameId = parseInt(match[1], 10);
this._setupCommPort(otherFrameId, port);
}
_onDisconnect(commPort) {
commPort.off('disconnect', this._onDisconnectBind);
this._commPorts.delete(commPort.otherFrameId);
}
_getOrCreateCommPort(otherFrameId) {
const commPort = this._commPorts.get(otherFrameId);
return (typeof commPort !== 'undefined' ? commPort : this._createCommPort(otherFrameId));
}
_createCommPort(otherFrameId) {
const port = yomichan.connect(null, {name: `background-cross-frame-communication-port-${otherFrameId}`});
return this._setupCommPort(otherFrameId, port);
}
_setupCommPort(otherFrameId, port) {
const commPort = new CrossFrameAPIPort(otherFrameId, port, this._messageHandlers);
this._commPorts.set(otherFrameId, commPort);
commPort.prepare();
commPort.on('disconnect', this._onDisconnectBind);
return commPort;
}
}
|