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// Copyright (c) 2016-present 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);
}
}
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