commit

docs/ccxt/examples/js/poll-ohlcv.js

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+
+
+import ccxt from '../../js/ccxt.js';
+
+const ohlcvsBySymbol = {}
+
+function handleAllOHLCVs (exchange, ohlcvs, symbol, timeframe) {
+    console.log ('----------------------------------------------------------')
+    console.log ('Last updated:', exchange.iso8601 (exchange.milliseconds ()))
+    const symbols = Object.keys (ohlcvsBySymbol)
+    for (let i = 0; i < symbols.length; i++) {
+        const symbol = symbols[i]
+        const ohlcvs = ohlcvsBySymbol[symbol]
+        const lastCandle = exchange.safeValue (ohlcvs, ohlcvs.length - 1)
+        const lastTimestamp = lastCandle[0]
+        console.log (exchange.iso8601 (lastTimestamp), symbol, timeframe, lastCandle.slice (1))
+    }
+}
+
+async function pollOHLCV (exchange, symbol, timeframe) {
+    while (true) {
+        try {
+            const response = await exchange.fetchOHLCV (symbol, timeframe)
+            ohlcvsBySymbol[symbol] = response
+            handleAllOHLCVs(exchange, response, symbol, timeframe)
+        } catch (e) {
+            console.log (e.constructor.name, e.message)
+        }
+    }
+}
+
+async function main () {
+
+    const exchange = new ccxt.binance()
+    const markets = await exchange.loadMarkets ()
+    const timeframe = '5m'
+
+    const firstOneHundredSymbols = exchange.symbols.slice (0, 100)
+
+    await Promise.all (firstOneHundredSymbols.map (symbol => pollOHLCV (exchange, symbol, timeframe)))
+}
+
+main ()