Reimplement adjustment of ccxt 'has' with more generic ccxt_config class attribute

freqtrade/exchange/bibox.py

@@ -17,5 +17,6 @@ class Bibox(Exchange):
     may still not work as expected.
     """
 
-    # Adjust ccxt exchange API metadata info
-    _ccxt_has: Dict = {"fetchCurrencies": False}
+    # fetchCurrencies API point requires authentication for Bibox,
+    # so switch it off for Freqtrade load_markets()
+    _ccxt_config: Dict = {"has": {"fetchCurrencies": False}}

freqtrade/exchange/exchange.py

@@ -30,8 +30,8 @@ class Exchange:
 
     _config: Dict = {}
 
-    # Adjustments to ccxt exchange API metadata info (ccxt exchange `has` options)
-    _ccxt_has: Dict = {}
+    # Parameters to add directly to ccxt sync/async initialization.
+    _ccxt_config: Dict = {}
 
     # Parameters to add directly to buy/sell calls (like agreeing to trading agreement)
     _params: Dict = {}
@@ -94,10 +94,17 @@ class Exchange:
         self._trades_pagination_arg = self._ft_has['trades_pagination_arg']
 
         # Initialize ccxt objects
+        ccxt_config = self._ccxt_config.copy()
+        ccxt_config = deep_merge_dicts(exchange_config.get('ccxt_config', {}),
+                                       ccxt_config)
         self._api = self._init_ccxt(
-            exchange_config, ccxt_kwargs=exchange_config.get('ccxt_config'))
+            exchange_config, ccxt_kwargs=ccxt_config)
+
+        ccxt_async_config = self._ccxt_config.copy()
+        ccxt_async_config = deep_merge_dicts(exchange_config.get('ccxt_async_config', {}),
+                                             ccxt_async_config)
         self._api_async = self._init_ccxt(
-            exchange_config, ccxt_async, ccxt_kwargs=exchange_config.get('ccxt_async_config'))
+            exchange_config, ccxt_async, ccxt_kwargs=ccxt_async_config)
 
         logger.info('Using Exchange "%s"', self.name)
 
@@ -155,10 +162,6 @@ class Exchange:
         except ccxt.BaseError as e:
             raise OperationalException(f"Initialization of ccxt failed. Reason: {e}") from e
 
-        # Adjust ccxt API metadata info (`has` options) for the exchange
-        for k, v in self._ccxt_has.items():
-            api.has[k] = v
-
         self.set_sandbox(api, exchange_config, name)
 
         return api