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docs/ccxt/examples/js/fetch-ohlcv-many-exchanges-continuosly.js

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+import ccxt from '../../js/ccxt.js';
+// AUTO-TRANSPILE //
+// fetch and handle constinuosly
+async function fetchOHLCVContinuously(exchange, symbol) {
+    while (true) {
+        try {
+            const ohlcv = await exchange.fetchOHLCV(symbol);
+            const ohlcvLength = ohlcv.length;
+            console.log('Fetched ', exchange.id, ' - ', symbol, ' candles. last candle: ', ohlcv[ohlcvLength - 1]);
+        }
+        catch (e) {
+            console.log(e);
+            break;
+        }
+    }
+}
+// start exchanges and fetch OHLCV loop
+async function startExchange(exchangeName, symbols) {
+    const ex = new ccxt[exchangeName]({});
+    const promises = [];
+    for (let i = 0; i < symbols.length; i++) {
+        const symbol = symbols[i];
+        promises.push(fetchOHLCVContinuously(ex, symbol));
+    }
+    await Promise.all(promises);
+    await ex.close();
+}
+// main function
+async function example() {
+    const exchanges = ['binance', 'okx', 'kraken'];
+    const symbols = ['BTC/USDT', 'ETH/USDT'];
+    const promises = [];
+    for (let i = 0; i < exchanges.length; i++) {
+        const exchangeName = exchanges[i];
+        promises.push(startExchange(exchangeName, symbols));
+    }
+    await Promise.all(promises);
+}
+await example();