refactor getting sell/current rate for telegram and selling

fix #1658

freqtrade/freqtradebot.py

@@ -579,6 +579,25 @@ class FreqtradeBot(object):
                         f"(from {order_amount} to {real_amount}) from Trades")
         return real_amount
 
+    def get_sell_rate(self, pair: str, refresh: bool) -> float:
+        """
+        Get sell rate - either using get-ticker bid or first bid based on orderbook
+        The orderbook portion is only used for rpc messaging, which would otherwise fail
+        for BitMex (has no bid/ask in get_ticker)
+        or remain static in any other case since it's not updating.
+        :return: Bid rate
+        """
+        config_ask_strategy = self.config.get('ask_strategy', {})
+        if config_ask_strategy.get('use_order_book', False):
+            logger.debug('Using order book to get sell rate')
+
+            order_book = self.exchange.get_order_book(pair, 1)
+            rate = order_book['asks'][0][0]
+
+        else:
+            rate = self.exchange.get_ticker(pair, refresh)['bid']
+        return rate
+
     def handle_trade(self, trade: Trade) -> bool:
         """
         Sells the current pair if the threshold is reached and updates the trade record.
@@ -615,7 +634,7 @@ class FreqtradeBot(object):
 
         else:
             logger.debug('checking sell')
-            sell_rate = self.exchange.get_ticker(trade.pair)['bid']
+            sell_rate = self.get_sell_rate(trade.pair, True)
             if self.check_sell(trade, sell_rate, buy, sell):
                 return True
 
@@ -858,7 +877,8 @@ class FreqtradeBot(object):
         """
         profit_rate = trade.close_rate if trade.close_rate else trade.close_rate_requested
         profit_trade = trade.calc_profit(rate=profit_rate)
-        current_rate = self.exchange.get_ticker(trade.pair)['bid']
+        # Use cached ticker here - it was updated seconds ago.
+        current_rate = self.get_sell_rate(trade.pair, False)
         profit_percent = trade.calc_profit_percent(profit_rate)
         gain = "profit" if profit_percent > 0 else "loss"
 

freqtrade/rpc/rpc.py

@@ -94,7 +94,7 @@ class RPC(object):
                     order = self._freqtrade.exchange.get_order(trade.open_order_id, trade.pair)
                 # calculate profit and send message to user
                 try:
-                    current_rate = self._freqtrade.exchange.get_ticker(trade.pair, False)['bid']
+                    current_rate = self._freqtrade.get_sell_rate(trade.pair, False)
                 except DependencyException:
                     current_rate = NAN
                 current_profit = trade.calc_profit_percent(current_rate)
@@ -125,7 +125,7 @@ class RPC(object):
             for trade in trades:
                 # calculate profit and send message to user
                 try:
-                    current_rate = self._freqtrade.exchange.get_ticker(trade.pair, False)['bid']
+                    current_rate = self._freqtrade.get_sell_rate(trade.pair, False)
                 except DependencyException:
                     current_rate = NAN
                 trade_perc = (100 * trade.calc_profit_percent(current_rate))
@@ -213,7 +213,7 @@ class RPC(object):
             else:
                 # Get current rate
                 try:
-                    current_rate = self._freqtrade.exchange.get_ticker(trade.pair, False)['bid']
+                    current_rate = self._freqtrade.get_sell_rate(trade.pair, False)
                 except DependencyException:
                     current_rate = NAN
                 profit_percent = trade.calc_profit_percent(rate=current_rate)
@@ -280,9 +280,9 @@ class RPC(object):
             else:
                 try:
                     if coin == 'USDT':
-                        rate = 1.0 / self._freqtrade.exchange.get_ticker('BTC/USDT', False)['bid']
+                        rate = 1.0 / self._freqtrade.get_sell_rate('BTC/USDT', False)
                     else:
-                        rate = self._freqtrade.exchange.get_ticker(coin + '/BTC', False)['bid']
+                        rate = self._freqtrade.get_sell_rate(coin + '/BTC', False)
                 except (TemporaryError, DependencyException):
                     continue
             est_btc: float = rate * balance['total']
@@ -356,7 +356,7 @@ class RPC(object):
                     return
 
             # Get current rate and execute sell
-            current_rate = self._freqtrade.exchange.get_ticker(trade.pair, False)['bid']
+            current_rate = self._freqtrade.get_sell_rate(trade.pair, False)
             self._freqtrade.execute_sell(trade, current_rate, SellType.FORCE_SELL)
         # ---- EOF def _exec_forcesell ----