89 lines
3.1 KiB
JavaScript
89 lines
3.1 KiB
JavaScript
class Comms {
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constructor(ocu, occ, oiu) {
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// Register callbacks
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this.on_candle_update = ocu;
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this.on_candle_close = occ;
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this.on_indctr_update = oiu;
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}
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candle_update(new_candle){
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// Call the callback provided.
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this.on_candle_update(new_candle);
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}
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candle_close(new_candle){
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// Forward a copy of the new candle to the server.
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this.app_con.send( JSON.stringify({ message_type: "candle_data", data :new_candle }));
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// Call the callback provided.
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this.on_candle_close(new_candle);
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}
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indicator_update(data){
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// Call the callback provided.
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this.on_indctr_update(data);
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}
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getPriceHistory(){
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let ph = fetch('http://localhost:5000/history').then((r) => r.json()).then( (data) => { return data; } );
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return ph;
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}
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getIndicatorData(){
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let id = fetch('http://localhost:5000/indicator_init').then((r) => r.json()).then( (data) => { return data; } );
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return id;
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}
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send_to_app(message_type, data){
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console.log( JSON.stringify({ message_type: message_type, data : data }));
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this.app_con.send( JSON.stringify({ message_type: message_type, data : data }));
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}
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set_app_con(){
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// Create a web socket connection to our app.
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this.app_con = new WebSocket('ws://localhost:5000/ws');
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this.app_con.onopen = () => this.app_con.send("Connection OK");
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this.app_con.addEventListener('message', ev => {
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if(ev.data){
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// Get the message received from server
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let msg = JSON.parse(ev.data)
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// Handle a request from the server
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if (msg.request) {
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//handle request
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console.log('Received a request from the server');
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console.log(msg.request);
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}
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// Handle a reply from the server
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if (msg.reply) {
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// Handle indicator updates
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if (msg.reply == 'i_updates'){
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this.indicator_update(msg.data)
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}
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}
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}
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})
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}
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set_exchange_con(interval){
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let ws = "wss://stream.binance.com:9443/ws/btcusdt@kline_" + interval;
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this.exchange_con = new WebSocket(ws);
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// Set the on-message call-back for the socket
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this.exchange_con.onmessage = (event) => {
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// Convert message to json obj
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let message = JSON.parse(event.data);
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// Isolate the candle data from message
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let candlestick = message.k;
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// Reformat data for lightweight charts
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let new_candle={
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time: candlestick.t / 1000,
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open: candlestick.o,
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high: candlestick.h,
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low: candlestick.l,
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close: candlestick.c,
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vol: candlestick.v
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};
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// Update frequently updated objects
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this.candle_update(new_candle);
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// Update less frequently updated objects.
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if (candlestick.x == true) { this.candle_close(new_candle); }
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}
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}
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} |