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
|
// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
const MAX_WEBSOCKET_FAILS = 7;
const MIN_WEBSOCKET_RETRY_TIME = 3000; // 3 sec
const MAX_WEBSOCKET_RETRY_TIME = 300000; // 5 mins
export default class WebSocketClient {
constructor() {
this.conn = null;
this.connectionUrl = null;
this.sequence = 1;
this.eventSequence = 0;
this.connectFailCount = 0;
this.eventCallback = null;
this.responseCallbacks = {};
this.firstConnectCallback = null;
this.reconnectCallback = null;
this.missedEventCallback = null;
this.errorCallback = null;
this.closeCallback = null;
}
initialize(connectionUrl = this.connectionUrl, token) {
if (this.conn) {
return;
}
if (connectionUrl == null) {
console.log('websocket must have connection url'); //eslint-disable-line no-console
return;
}
if (this.connectFailCount === 0) {
console.log('websocket connecting to ' + connectionUrl); //eslint-disable-line no-console
}
this.conn = new WebSocket(connectionUrl);
this.connectionUrl = connectionUrl;
this.conn.onopen = () => {
this.eventSequence = 0;
if (token) {
this.sendMessage('authentication_challenge', {token});
}
if (this.connectFailCount > 0) {
console.log('websocket re-established connection'); //eslint-disable-line no-console
if (this.reconnectCallback) {
this.reconnectCallback();
}
} else if (this.firstConnectCallback) {
this.firstConnectCallback();
}
this.connectFailCount = 0;
};
this.conn.onclose = () => {
this.conn = null;
this.sequence = 1;
if (this.connectFailCount === 0) {
console.log('websocket closed'); //eslint-disable-line no-console
}
this.connectFailCount++;
if (this.closeCallback) {
this.closeCallback(this.connectFailCount);
}
let retryTime = MIN_WEBSOCKET_RETRY_TIME;
// If we've failed a bunch of connections then start backing off
if (this.connectFailCount > MAX_WEBSOCKET_FAILS) {
retryTime = MIN_WEBSOCKET_RETRY_TIME * this.connectFailCount * this.connectFailCount;
if (retryTime > MAX_WEBSOCKET_RETRY_TIME) {
retryTime = MAX_WEBSOCKET_RETRY_TIME;
}
}
setTimeout(
() => {
this.initialize(connectionUrl, token);
},
retryTime
);
};
this.conn.onerror = (evt) => {
if (this.connectFailCount <= 1) {
console.log('websocket error'); //eslint-disable-line no-console
console.log(evt); //eslint-disable-line no-console
}
if (this.errorCallback) {
this.errorCallback(evt);
}
};
this.conn.onmessage = (evt) => {
const msg = JSON.parse(evt.data);
if (msg.seq_reply) {
if (msg.error) {
console.log(msg); //eslint-disable-line no-console
}
if (this.responseCallbacks[msg.seq_reply]) {
this.responseCallbacks[msg.seq_reply](msg);
Reflect.deleteProperty(this.responseCallbacks, msg.seq_reply);
}
} else if (this.eventCallback) {
if (msg.seq !== this.eventSequence && this.missedEventCallback) {
console.log('missed websocket event, act_seq=' + msg.seq + ' exp_seq=' + this.eventSequence); //eslint-disable-line no-console
this.missedEventCallback();
}
this.eventSequence = msg.seq + 1;
this.eventCallback(msg);
}
};
}
setEventCallback(callback) {
this.eventCallback = callback;
}
setFirstConnectCallback(callback) {
this.firstConnectCallback = callback;
}
setReconnectCallback(callback) {
this.reconnectCallback = callback;
}
setMissedEventCallback(callback) {
this.missedEventCallback = callback;
}
setErrorCallback(callback) {
this.errorCallback = callback;
}
setCloseCallback(callback) {
this.closeCallback = callback;
}
close() {
this.connectFailCount = 0;
this.sequence = 1;
if (this.conn && this.conn.readyState === WebSocket.OPEN) {
this.conn.onclose = () => {}; //eslint-disable-line no-empty-function
this.conn.close();
this.conn = null;
console.log('websocket closed'); //eslint-disable-line no-console
}
}
sendMessage(action, data, responseCallback) {
const msg = {
action,
seq: this.sequence++,
data
};
if (responseCallback) {
this.responseCallbacks[msg.seq] = responseCallback;
}
if (this.conn && this.conn.readyState === WebSocket.OPEN) {
this.conn.send(JSON.stringify(msg));
} else if (!this.conn || this.conn.readyState === WebSocket.CLOSED) {
this.conn = null;
this.initialize();
}
}
userTyping(channelId, parentId, callback) {
const data = {};
data.channel_id = channelId;
data.parent_id = parentId;
this.sendMessage('user_typing', data, callback);
}
getStatuses(callback) {
this.sendMessage('get_statuses', null, callback);
}
getStatusesByIds(userIds, callback) {
const data = {};
data.user_ids = userIds;
this.sendMessage('get_statuses_by_ids', data, callback);
}
}
|
