Add log_on_refresh - using TTL caching to avoid spamming logs

freqtrade/pairlist/IPairList.py

@@ -9,6 +9,8 @@ from abc import ABC, abstractmethod, abstractproperty
 from copy import deepcopy
 from typing import Any, Dict, List
 
+from cachetools import TTLCache, cached
+
 from freqtrade.exchange import market_is_active
 
 logger = logging.getLogger(__name__)
@@ -31,6 +33,9 @@ class IPairList(ABC):
         self._config = config
         self._pairlistconfig = pairlistconfig
         self._pairlist_pos = pairlist_pos
+        self.refresh_period = self._pairlistconfig.get('refresh_period', 1800)
+        self._last_refresh = 0
+        self._log_cache = TTLCache(maxsize=1024, ttl=self.refresh_period)
 
     @property
     def name(self) -> str:
@@ -40,6 +45,24 @@ class IPairList(ABC):
         """
         return self.__class__.__name__
 
+    def log_on_refresh(self, logmethod, message: str) -> None:
+        """
+        Logs message - not more often than "refresh_period" to avoid log spamming
+        Logs the log-message as debug as well to simplify debugging.
+        :param logmethod: Function that'll be called. Most likely `logger.info`.
+        :param message: String containing the message to be sent to the function.
+        :return: None.
+        """
+
+        @cached(cache=self._log_cache)
+        def _log_on_refresh(logmethod, message: str):
+            logmethod(message)
+
+        # Log as debug first
+        logger.debug(message)
+        # Call hidden function.
+        _log_on_refresh(logmethod, message)
+
     @abstractproperty
     def needstickers(self) -> bool:
         """