Use proper logging (using the Filter's logger)

freqtrade/pairlist/pairlistmanager.py

@@ -93,7 +93,7 @@ class PairListManager():
 
         # Validation against blacklist happens after the chain of Pairlist Handlers
         # to ensure blacklist is respected.
-        pairlist = self.verify_blacklist(pairlist, True)
+        pairlist = self.verify_blacklist(pairlist, logger.warning)
 
         self._whitelist = pairlist
 
@@ -110,21 +110,19 @@ class PairListManager():
 
         return pairlist
 
-    def verify_blacklist(self, pairlist: List[str], aswarning: bool) -> List[str]:
+    def verify_blacklist(self, pairlist: List[str], logmethod) -> List[str]:
         """
         Verify and remove items from pairlist - returning a filtered pairlist.
         Logs a warning or info depending on `aswarning`.
-        Pairlist Handlers explicitly using this method shall use `aswarning=False`!
+        Pairlist Handlers explicitly using this method shall use
+        `logmethod=logger.info` to avoid spamming with warning messages
         :param pairlist: Pairlist to validate
-        :param aswarning: Log message as Warning or Info
+        :param logmethod: Function that'll be called, `logger.info` or `logger.warning`.
         :return: pairlist - blacklisted pairs
         """
         for pair in deepcopy(pairlist):
             if pair in self._blacklist:
-                if aswarning:
-                    logger.warning(f"Pair {pair} in your blacklist. Removing it from whitelist...")
-                else:
-                    logger.info(f"Pair {pair} in your blacklist. Removing it from whitelist...")
+                logmethod(f"Pair {pair} in your blacklist. Removing it from whitelist...")
                 pairlist.remove(pair)
         return pairlist