/
ws.js
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/
ws.js
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const WebSocket = require('ws');
const Beautifier = require('./beautifier.js');
class BinanceWS {
constructor() {
this._baseUrl = 'wss://stream.binance.com:9443/ws/'
this._sockets = {};
this._beautifier = new Beautifier();
}
_setupWebSocket(eventHandler, path) {
if (this._sockets[path]) {
return this._sockets[path];
}
path = this._baseUrl + path;
const ws = new WebSocket(path);
ws.on('message', (json) => {
const data = JSON.parse(json);
eventHandler(this._beautifier.beautifier(data, data.e + 'Event'));
});
return ws;
}
onDepthUpdate(symbol, eventHandler) {
const path = `${symbol.toLowerCase()}@depth`;
return this._setupWebSocket(eventHandler, path);
}
onKline(symbol, interval, eventHandler) {
const path = `${symbol.toLowerCase()}@kline_${interval}`;
return this._setupWebSocket(eventHandler, path);
}
onAggTrade(symbol, eventHandler) {
const path = `${symbol.toLowerCase()}@aggTrade`;
return this._setupWebSocket(eventHandler, path);
}
onUserData(binanceRest, eventHandler, interval) {
binanceRest.startUserDataStream()
.then((response) => {
return this._setupWebSocket(eventHandler, response.listenKey);
setInterval(() => {
binanceRest.keepAliveUserDataStream(response);
}, interval || 60000);
});
}
}
module.exports = BinanceWS;