71 lines
2.6 KiB
Python
71 lines
2.6 KiB
Python
import logging
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from copy import deepcopy
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from typing import Any, Dict, List
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from freqtrade.pairlist.IPairList import IPairList
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logger = logging.getLogger(__name__)
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class PriceFilter(IPairList):
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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._low_price_ratio = pairlistconfig.get('low_price_ratio', 0)
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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 requries 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 True
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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 priced below {self._low_price_ratio * 100}%."
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def _validate_ticker_lowprice(self, ticker) -> bool:
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"""
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Check if if one price-step (pip) is > than a certain barrier.
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:param ticker: ticker dict as returned from ccxt.load_markets()
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:param precision: Precision
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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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precision = self._exchange.markets[ticker['symbol']]['precision']['price']
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compare = ticker['last'] + 1 / pow(10, precision)
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changeperc = (compare - ticker['last']) / ticker['last']
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if changeperc > self._low_price_ratio:
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logger.info(f"Removed {ticker['symbol']} from whitelist, "
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f"because 1 unit is {changeperc * 100:.3f}%")
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return False
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return True
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def filter_pairlist(self, pairlist: List[str], tickers: Dict) -> List[str]:
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"""
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Filters and sorts pairlist and returns the whitelist again.
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Called on each bot iteration - please use internal caching if necessary
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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 whitelist
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"""
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# Copy list since we're modifying this list
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for p in deepcopy(pairlist):
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ticker = tickers.get(p)
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if not ticker:
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pairlist.remove(p)
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# Filter out assets which would not allow setting a stoploss
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if self._low_price_ratio and not self._validate_ticker_lowprice(ticker):
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pairlist.remove(p)
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return pairlist
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