bitz throw a warning message on 24h ohlcv volumes fix ccxt#3271

js/bitz.js

@@ -123,6 +123,8 @@ module.exports = class bitz extends Exchange {
                 'price': 8,
             },
             'options': {
+                'fetchOHLCVVolume': true,
+                'fetchOHLCVWarning': true,
                 'lastNonceTimestamp': 0,
             },
             'commonCurrencies': {
@@ -286,7 +288,23 @@ module.exports = class bitz extends Exchange {
         return this.parseTrades (trades, market, since, limit);
     }
 
+    parseOHLCV (ohlcv, market = undefined, timeframe = '1m', since = undefined, limit = undefined) {
+        let volume = this.options['fetchOHLCVVolume'] ? ohlcv[5] : undefined;
+        return [
+            ohlcv[0],
+            ohlcv[1],
+            ohlcv[2],
+            ohlcv[3],
+            ohlcv[4],
+            volume,
+        ];
+    }
+
     async fetchOHLCV (symbol, timeframe = '1m', since = undefined, limit = undefined, params = {}) {
+        if (this.options['fetchOHLCVWarning']) {
+            // eslint-disable-next-line quotes
+            throw new ExchangeError (this.id + " will return 24h volumes instead of volumes for " + timeframe + " from their API. Set .options['fetchOHLCVWarning'] = false to suppress this warning message. You can set .options['fetchOHLCVVolume'] = false to fetch candles with volume set to undefined.");
+        }
         await this.loadMarkets ();
         let market = this.market (symbol);
         let response = await this.publicGetKline (this.extend ({