minor improvements and pairlist data transmission

freqtrade/plugins/pairlist/ExternalPairList.py

@@ -0,0 +1,59 @@
+"""
+External Pair List provider
+
+Provides pair list from Leader data
+"""
+import logging
+from typing import Any, Dict, List
+
+from freqtrade.plugins.pairlist.IPairList import IPairList
+
+
+logger = logging.getLogger(__name__)
+
+
+class ExternalPairList(IPairList):
+
+    def __init__(self, exchange, pairlistmanager,
+                 config: Dict[str, Any], pairlistconfig: Dict[str, Any],
+                 pairlist_pos: int) -> None:
+        super().__init__(exchange, pairlistmanager, config, pairlistconfig, pairlist_pos)
+
+        self._num_assets = self._pairlistconfig.get('num_assets')
+        self._allow_inactive = self._pairlistconfig.get('allow_inactive', False)
+
+        self._leader_pairs: List[str] = []
+
+    @property
+    def needstickers(self) -> bool:
+        """
+        Boolean property defining if tickers are necessary.
+        If no Pairlist requires tickers, an empty Dict is passed
+        as tickers argument to filter_pairlist
+        """
+        return False
+
+    def short_desc(self) -> str:
+        """
+        Short whitelist method description - used for startup-messages
+        -> Please overwrite in subclasses
+        """
+        return f"{self.name}"
+
+    def gen_pairlist(self, tickers: Dict) -> List[str]:
+        """
+        Generate the pairlist
+        :param tickers: Tickers (from exchange.get_tickers()). May be cached.
+        :return: List of pairs
+        """
+        pass
+
+    def filter_pairlist(self, pairlist: List[str], tickers: Dict) -> List[str]:
+        """
+        Filters and sorts pairlist and returns the whitelist again.
+        Called on each bot iteration - please use internal caching if necessary
+        :param pairlist: pairlist to filter or sort
+        :param tickers: Tickers (from exchange.get_tickers()). May be cached.
+        :return: new whitelist
+        """
+        pass