44 lines
1.3 KiB
JavaScript
44 lines
1.3 KiB
JavaScript
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function CW(resource) {
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this.conn = new WebSocket('wss://stream.cryptowat.ch/connect?apikey=GPDLXH702E1NAD96OSBO');
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this.conn.binaryType = "arraybuffer";
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this.conn.onopen = () => {
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console.log("CW websocket connected");
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if (this.onconnect) this.onconnect();
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}
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let decoder = new TextDecoder();
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this.conn.onmessage = (msg) => {
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let d = JSON.parse(decoder.decode(msg.data));
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// The server will always send an AUTHENTICATED signal when you establish a valid connection
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// At this point you can subscribe to resources
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if (d.authenticationResult && d.authenticationResult.status === 'AUTHENTICATED') {
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if (this.onauth) this.onauth();
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this.conn.send(JSON.stringify({
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subscribe: {
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subscriptions: [
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{streamSubscription: {resource: resource}},
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],
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}
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}));
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return;
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}
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// Market data comes in a marketUpdate
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// In this case, we're expecting trades so we look for marketUpdate.tradesUpdate
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if (!d.marketUpdate || !d.marketUpdate.tradesUpdate) {
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return;
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}
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let trades = d.marketUpdate.tradesUpdate.trades;
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for (let i in trades) {
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trades[i].price = parseFloat(trades[i].priceStr);
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trades[i].volume = parseFloat(trades[i].amountStr);
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}
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if (this.ontrades) this.ontrades(trades);
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}
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this.close = () => this.conn.close();
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}
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