[Exchange] fix open position check and set_symbol_position_mode

tmp

octobot_trading/exchanges/connectors/ccxt/ccxt_connector.py

@@ -460,7 +460,7 @@ async def set_symbol_margin_type(self, symbol: str, isolated: bool):
                                                  marginType=self.CCXT_ISOLATED if isolated else self.CCXT_CROSSED)
 
     async def set_symbol_position_mode(self, symbol: str, one_way: bool):
-        return await self.client.set_position_mode(self, hedged=not one_way, symbol=symbol)
+        return await self.client.set_position_mode(hedged=not one_way, symbol=symbol)
 
     async def set_symbol_partial_take_profit_stop_loss(self, symbol: str, inverse: bool,
                                                        tp_sl_mode: enums.TakeProfitStopLossMode):

octobot_trading/exchanges/traders/trader.pxd

@@ -40,4 +40,5 @@ cdef class Trader(util.Initializable):
     cpdef object set_risk(self, object risk)
     cpdef object convert_order_to_trade(self, object order)
 
-    cdef bint _has_open_position(self, str symbol)
+    # any() cant be cythonized
+    # cdef bool _has_open_position(self, str symbol)

octobot_trading/exchanges/traders/trader.py

@@ -671,5 +671,8 @@ def _has_open_position(self, symbol):
         :param symbol: the position symbol
         :return: True if open position for :symbol: exists
         """
-        return len(self.exchange_manager.exchange_personal_data.positions_manager.get_symbol_positions(
-            symbol=symbol)) != 0
+        return any(
+                position.size
+                for position in self.exchange_manager.exchange_personal_data.positions_manager.get_symbol_positions(
+                    symbol=symbol
+                ))