replace get_open_oders() with get_order() and add property for fee

freqtrade/exchange/interface.py

@@ -1,5 +1,5 @@
 from abc import ABC, abstractmethod
-from typing import List, Optional
+from typing import List, Optional, Dict
 
 import arrow
 
@@ -13,6 +13,14 @@ class Exchange(ABC):
         """
         return self.__class__.__name__
 
+    @property
+    def fee(self) -> float:
+        """
+        Fee for placing an order
+        :return: percentage in float
+        """
+        return 0.0
+
     @property
     @abstractmethod
     def sleep_time(self) -> float:
@@ -100,6 +108,22 @@ class Exchange(ABC):
         }
         """
 
+    def get_order(self, order_id: str) -> Dict:
+        """
+        Get order details for the given order_id.
+        :param order_id: ID as str
+        :return: dict, format: {
+            'id': str,
+            'type': str,
+            'pair': str,
+            'opened': str ISO 8601 datetime,
+            'closed': str ISO 8601 datetime,
+            'rate': float,
+            'amount': float,
+            'remaining': int
+        }
+        """
+
     @abstractmethod
     def cancel_order(self, order_id: str) -> None:
         """
@@ -108,24 +132,6 @@ class Exchange(ABC):
         :return: None
         """
 
-    @abstractmethod
-    def get_open_orders(self, pair: str) -> List[dict]:
-        """
-        Gets all open orders for given pair.
-        :param pair: Pair as str, format: BTC_ETC
-        :return: List of dicts, format: [
-            {
-                'id': str,
-                'type': str,
-                'opened': datetime,
-                'rate': float,
-                'amount': float,
-                'remaining': int,
-            },
-            ...
-        ]
-        """
-
     @abstractmethod
     def get_pair_detail_url(self, pair: str) -> str:
         """