Refactor static whitelist to module

freqtrade/pairlist/StaticList.py

@@ -0,0 +1,70 @@
+"""
+Static List provider
+
+Provides lists as configured in config.json
+
+ """
+import logging
+from typing import List, Optional
+
+logger = logging.getLogger(__name__)
+
+
+class StaticList(object):
+
+    def __init__(self, freqtrade, config: dict) -> None:
+        self._freqtrade = freqtrade
+        self._config = config
+        self._whitelist = self._config['exchange']['pair_whitelist']
+        self._blacklist = self._config['exchange'].get('pair_blacklist', [])
+        self.refresh_whitelist()
+
+    @property
+    def whitelist(self) -> List[str]:
+        """ Contains the current whitelist """
+        return self._whitelist
+
+    @property
+    def blacklist(self) -> List[str]:
+        return self._blacklist
+
+    def refresh_whitelist(self) -> bool:
+        """
+        Refreshes whitelist.
+        """
+        return self.validate_whitelist(self._config['exchange']['pair_whitelist'])
+
+    def validate_whitelist(self, whitelist: List[str]) -> bool:
+        """
+        Check available markets and remove pair from whitelist if necessary
+        :param whitelist: the sorted list (based on BaseVolume) of pairs the user might want to
+        trade
+        :return: the list of pairs the user wants to trade without the one unavailable or
+        black_listed
+        """
+        sanitized_whitelist = whitelist
+        markets = self._freqtrade.exchange.get_markets()
+
+        # Filter to markets in stake currency
+        markets = [m for m in markets if m['quote'] == self._config['stake_currency']]
+        known_pairs = set()
+
+        for market in markets:
+            pair = market['symbol']
+            # pair is not int the generated dynamic market, or in the blacklist ... ignore it
+            if pair not in whitelist or pair in self.blacklist:
+                continue
+            # else the pair is valid
+            known_pairs.add(pair)
+            # Market is not active
+            if not market['active']:
+                sanitized_whitelist.remove(pair)
+                logger.info(
+                    'Ignoring %s from whitelist. Market is not active.',
+                    pair
+                )
+
+        # We need to remove pairs that are unknown
+        self._whitelist = [x for x in sanitized_whitelist if x in known_pairs]
+
+        return True