124 lines
4.7 KiB
Python
124 lines
4.7 KiB
Python
"""
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Volatility pairlist filter
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"""
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import logging
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import sys
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from copy import deepcopy
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from typing import Any, Dict, List, Optional
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import arrow
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import numpy as np
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from cachetools.ttl import TTLCache
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from pandas import DataFrame
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from freqtrade.enums import CandleType
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from freqtrade.exceptions import OperationalException
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from freqtrade.misc import plural
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from freqtrade.plugins.pairlist.IPairList import IPairList
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logger = logging.getLogger(__name__)
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class VolatilityFilter(IPairList):
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"""
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Filters pairs by volatility
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"""
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def __init__(self, exchange, pairlistmanager,
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config: Dict[str, Any], pairlistconfig: Dict[str, Any],
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pairlist_pos: int) -> None:
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super().__init__(exchange, pairlistmanager, config, pairlistconfig, pairlist_pos)
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self._days = pairlistconfig.get('lookback_days', 10)
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self._min_volatility = pairlistconfig.get('min_volatility', 0)
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self._max_volatility = pairlistconfig.get('max_volatility', sys.maxsize)
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self._refresh_period = pairlistconfig.get('refresh_period', 1440)
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self._pair_cache: TTLCache = TTLCache(maxsize=1000, ttl=self._refresh_period)
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if self._days < 1:
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raise OperationalException("VolatilityFilter requires lookback_days to be >= 1")
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if self._days > exchange.ohlcv_candle_limit('1d'):
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raise OperationalException("VolatilityFilter requires lookback_days to not "
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"exceed exchange max request size "
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f"({exchange.ohlcv_candle_limit('1d')})")
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@property
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def needstickers(self) -> bool:
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"""
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Boolean property defining if tickers are necessary.
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If no Pairlist requires tickers, an empty List is passed
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as tickers argument to filter_pairlist
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"""
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return False
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def short_desc(self) -> str:
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"""
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Short whitelist method description - used for startup-messages
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"""
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return (f"{self.name} - Filtering pairs with volatility range "
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f"{self._min_volatility}-{self._max_volatility} "
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f" the last {self._days} {plural(self._days, 'day')}.")
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def filter_pairlist(self, pairlist: List[str], tickers: Dict) -> List[str]:
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"""
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Validate trading range
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:param pairlist: pairlist to filter or sort
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:param tickers: Tickers (from exchange.get_tickers()). May be cached.
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:return: new allowlist
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"""
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needed_pairs = [(p, '1d', CandleType.SPOT_) for p in pairlist if p not in self._pair_cache]
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since_ms = (arrow.utcnow()
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.floor('day')
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.shift(days=-self._days - 1)
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.int_timestamp) * 1000
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# Get all candles
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candles = {}
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if needed_pairs:
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candles = self._exchange.refresh_latest_ohlcv(needed_pairs, since_ms=since_ms,
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cache=False)
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if self._enabled:
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for p in deepcopy(pairlist):
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daily_candles = candles[(p, '1d', CandleType.SPOT_)] if (
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p, '1d', CandleType.SPOT_) in candles else None
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if not self._validate_pair_loc(p, daily_candles):
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pairlist.remove(p)
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return pairlist
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def _validate_pair_loc(self, pair: str, daily_candles: Optional[DataFrame]) -> bool:
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"""
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Validate trading range
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:param pair: Pair that's currently validated
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:param ticker: ticker dict as returned from ccxt.fetch_tickers()
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:return: True if the pair can stay, false if it should be removed
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"""
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# Check symbol in cache
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cached_res = self._pair_cache.get(pair, None)
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if cached_res is not None:
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return cached_res
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result = False
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if daily_candles is not None and not daily_candles.empty:
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returns = (np.log(daily_candles.close / daily_candles.close.shift(-1)))
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returns.fillna(0, inplace=True)
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volatility_series = returns.rolling(window=self._days).std()*np.sqrt(self._days)
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volatility_avg = volatility_series.mean()
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if self._min_volatility <= volatility_avg <= self._max_volatility:
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result = True
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else:
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self.log_once(f"Removed {pair} from whitelist, because volatility "
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f"over {self._days} {plural(self._days, 'day')} "
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f"is: {volatility_avg:.3f} "
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f"which is not in the configured range of "
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f"{self._min_volatility}-{self._max_volatility}.",
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logger.info)
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result = False
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self._pair_cache[pair] = result
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return result
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