""" PairList Handler base class """ import logging from abc import ABC, abstractmethod, abstractproperty from copy import deepcopy from typing import Any, Dict, List, Optional from freqtrade.constants import Config from freqtrade.exceptions import OperationalException from freqtrade.exchange import Exchange, market_is_active from freqtrade.exchange.types import Ticker, Tickers from freqtrade.mixins import LoggingMixin logger = logging.getLogger(__name__) class IPairList(LoggingMixin, ABC): def __init__(self, exchange: Exchange, pairlistmanager, config: Config, pairlistconfig: Dict[str, Any], pairlist_pos: int) -> None: """ :param exchange: Exchange instance :param pairlistmanager: Instantiated Pairlist manager :param config: Global bot configuration :param pairlistconfig: Configuration for this Pairlist Handler - can be empty. :param pairlist_pos: Position of the Pairlist Handler in the chain """ self._enabled = True self._exchange: Exchange = exchange self._pairlistmanager = pairlistmanager self._config = config self._pairlistconfig = pairlistconfig self._pairlist_pos = pairlist_pos self.refresh_period = self._pairlistconfig.get('refresh_period', 1800) LoggingMixin.__init__(self, logger, self.refresh_period) @property def name(self) -> str: """ Gets name of the class -> no need to overwrite in subclasses """ return self.__class__.__name__ @abstractproperty 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 """ @abstractmethod def short_desc(self) -> str: """ Short whitelist method description - used for startup-messages -> Please overwrite in subclasses """ def _validate_pair(self, pair: str, ticker: Optional[Ticker]) -> bool: """ Check one pair against Pairlist Handler's specific conditions. Either implement it in the Pairlist Handler or override the generic filter_pairlist() method. :param pair: Pair that's currently validated :param ticker: ticker dict as returned from ccxt.fetch_ticker :return: True if the pair can stay, false if it should be removed """ raise NotImplementedError() def gen_pairlist(self, tickers: Tickers) -> List[str]: """ Generate the pairlist. This method is called once by the pairlistmanager in the refresh_pairlist() method to supply the starting pairlist for the chain of the Pairlist Handlers. Pairlist Filters (those Pairlist Handlers that cannot be used at the first position in the chain) shall not override this base implementation -- it will raise the exception if a Pairlist Handler is used at the first position in the chain. :param tickers: Tickers (from exchange.get_tickers). May be cached. :return: List of pairs """ raise OperationalException("This Pairlist Handler should not be used " "at the first position in the list of Pairlist Handlers.") def filter_pairlist(self, pairlist: List[str], tickers: Tickers) -> List[str]: """ Filters and sorts pairlist and returns the whitelist again. Called on each bot iteration - please use internal caching if necessary This generic implementation calls self._validate_pair() for each pair in the pairlist. Some Pairlist Handlers override this generic implementation and employ own filtration. :param pairlist: pairlist to filter or sort :param tickers: Tickers (from exchange.get_tickers). May be cached. :return: new whitelist """ if self._enabled: # Copy list since we're modifying this list for p in deepcopy(pairlist): # Filter out assets if not self._validate_pair(p, tickers[p] if p in tickers else None): pairlist.remove(p) return pairlist def verify_blacklist(self, pairlist: List[str], logmethod) -> List[str]: """ Proxy method to verify_blacklist for easy access for child classes. :param pairlist: Pairlist to validate :param logmethod: Function that'll be called, `logger.info` or `logger.warning`. :return: pairlist - blacklisted pairs """ return self._pairlistmanager.verify_blacklist(pairlist, logmethod) def verify_whitelist(self, pairlist: List[str], logmethod, keep_invalid: bool = False) -> List[str]: """ Proxy method to verify_whitelist for easy access for child classes. :param pairlist: Pairlist to validate :param logmethod: Function that'll be called, `logger.info` or `logger.warning` :param keep_invalid: If sets to True, drops invalid pairs silently while expanding regexes. :return: pairlist - whitelisted pairs """ return self._pairlistmanager.verify_whitelist(pairlist, logmethod, keep_invalid) def _whitelist_for_active_markets(self, pairlist: List[str]) -> List[str]: """ Check available markets and remove pair from whitelist if necessary :param pairlist: the sorted list of pairs the user might want to trade :return: the list of pairs the user wants to trade without those unavailable or black_listed """ markets = self._exchange.markets if not markets: raise OperationalException( 'Markets not loaded. Make sure that exchange is initialized correctly.') sanitized_whitelist: List[str] = [] for pair in pairlist: # pair is not in the generated dynamic market or has the wrong stake currency if pair not in markets: self.log_once(f"Pair {pair} is not compatible with exchange " f"{self._exchange.name}. Removing it from whitelist..", logger.warning) continue if not self._exchange.market_is_tradable(markets[pair]): self.log_once(f"Pair {pair} is not tradable with Freqtrade." "Removing it from whitelist..", logger.warning) continue if self._exchange.get_pair_quote_currency(pair) != self._config['stake_currency']: self.log_once(f"Pair {pair} is not compatible with your stake currency " f"{self._config['stake_currency']}. Removing it from whitelist..", logger.warning) continue # Check if market is active market = markets[pair] if not market_is_active(market): self.log_once(f"Ignoring {pair} from whitelist. Market is not active.", logger.info) continue if pair not in sanitized_whitelist: sanitized_whitelist.append(pair) # We need to remove pairs that are unknown return sanitized_whitelist