Added okex exchange class futures properties

freqtrade/exchange/okex.py

@@ -1,6 +1,7 @@
 import logging
-from typing import Dict
+from typing import Dict, List, Tuple
 
+from freqtrade.enums import Collateral, TradingMode
 from freqtrade.exchange import Exchange
 
 
@@ -16,3 +17,29 @@ class Okex(Exchange):
     _ft_has: Dict = {
         "ohlcv_candle_limit": 100,
     }
+    funding_fee_times: List[int] = [0, 8, 16]  # hours of the day
+
+    _supported_trading_mode_collateral_pairs: List[Tuple[TradingMode, Collateral]] = [
+        # TradingMode.SPOT always supported and not required in this list
+        # (TradingMode.MARGIN, Collateral.CROSS),  # TODO-lev: Uncomment once supported
+        # (TradingMode.FUTURES, Collateral.CROSS),  # TODO-lev: Uncomment once supported
+        # (TradingMode.FUTURES, Collateral.ISOLATED) # TODO-lev: Uncomment once supported
+    ]
+
+    @property
+    def _ccxt_config(self) -> Dict:
+        # Parameters to add directly to ccxt sync/async initialization.
+        if self.trading_mode == TradingMode.MARGIN:
+            return {
+                "options": {
+                    "defaultType": "margin"
+                }
+            }
+        elif self.trading_mode == TradingMode.FUTURES:
+            return {
+                "options": {
+                    "defaultType": "swap"
+                }
+            }
+        else:
+            return {}