Update confirm_trade_entry to support "side" parameter

freqtrade/strategy/interface.py

@@ -230,9 +230,9 @@ class IStrategy(ABC, HyperStrategyMixin):
         """
         pass
 
-    # TODO-lev: add side
     def confirm_trade_entry(self, pair: str, order_type: str, amount: float, rate: float,
-                            time_in_force: str, current_time: datetime, **kwargs) -> bool:
+                            time_in_force: str, current_time: datetime,
+                            side: str, **kwargs) -> bool:
         """
         Called right before placing a entry order.
         Timing for this function is critical, so avoid doing heavy computations or
@@ -248,6 +248,7 @@ class IStrategy(ABC, HyperStrategyMixin):
         :param rate: Rate that's going to be used when using limit orders
         :param time_in_force: Time in force. Defaults to GTC (Good-til-cancelled).
         :param current_time: datetime object, containing the current datetime
+        :param side: 'long' or 'short' - indicating the direction of the proposed trade
         :param **kwargs: Ensure to keep this here so updates to this won't break your strategy.
         :return bool: When True is returned, then the buy-order is placed on the exchange.
             False aborts the process