commit

docs/ccxt/examples/ccxt.pro/js/watch-many-exchanges-many-symbols.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const ccxt = require ('../../../ccxt');
+
+console.log ('CCXT Version:', ccxt.version)
+
+
+async function watchTickerLoop (exchange, symbol) {
+    // exchange.verbose = true // uncomment for debugging purposes if necessary
+    while (true) {
+        try {
+            const ticker = await exchange.watchTicker (symbol)
+            console.log (new Date (), exchange.id, symbol, ticker['last'])
+        } catch (e) {
+            console.log (symbol, e)
+            // do nothing and retry on next loop iteration
+            // throw e // uncomment to break all loops in case of an error in any one of them
+            // break // you can also break just this one loop if it fails
+        }
+    }
+}
+
+async function exchangeLoop (exchangeId, symbols) {
+     const exchange = new ccxt.pro[exchangeId]()
+    await exchange.loadMarkets ()
+    const loops = symbols.map (symbol => watchTickerLoop (exchange, symbol))
+    await Promise.all (loops)
+    await exchange.close ()
+}
+
+async function main () {
+    const exchanges = {
+        'binance': [ 'BTC/USDT', 'ETH/USDT' ],
+        'ftx': [ 'BTC/USD', 'ETH/USD' ],
+    }
+    const loops = Object.entries (exchanges).map (([ exchangeId, symbols ]) => exchangeLoop (exchangeId, symbols))
+    await Promise.all (loops)
+}
+
+main ()