freqtrade/plugins/pairlist/ShuffleFilter.py
"""
Shuffle pair list filter
"""
import logging
import random
from typing import Any, Dict, List, Literal
from freqtrade.constants import Config
from freqtrade.enums import RunMode
from freqtrade.exchange import timeframe_to_seconds
from freqtrade.exchange.types import Tickers
from freqtrade.plugins.pairlist.IPairList import IPairList, PairlistParameter
from freqtrade.util.periodic_cache import PeriodicCache
logger = logging.getLogger(__name__)
ShuffleValues = Literal['candle', 'iteration']
class ShuffleFilter(IPairList):
def __init__(self, exchange, pairlistmanager,
config: Config, pairlistconfig: Dict[str, Any],
pairlist_pos: int) -> None:
super().__init__(exchange, pairlistmanager, config, pairlistconfig, pairlist_pos)
# Apply seed in backtesting mode to get comparable results,
# but not in live modes to get a non-repeating order of pairs during live modes.
if config.get('runmode') in (RunMode.LIVE, RunMode.DRY_RUN):
self._seed = None
logger.info("Live mode detected, not applying seed.")
else:
self._seed = pairlistconfig.get('seed')
logger.info(f"Backtesting mode detected, applying seed value: {self._seed}")
self._random = random.Random(self._seed)
self._shuffle_freq: ShuffleValues = pairlistconfig.get('shuffle_frequency', 'candle')
self.__pairlist_cache = PeriodicCache(
maxsize=1000, ttl=timeframe_to_seconds(self._config['timeframe']))
@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
"""
return (f"{self.name} - Shuffling pairs every {self._shuffle_freq}" +
(f", seed = {self._seed}." if self._seed is not None else "."))
@staticmethod
def description() -> str:
return "Randomize pairlist order."
@staticmethod
def available_parameters() -> Dict[str, PairlistParameter]:
return {
"shuffle_frequency": {
"type": "option",
"default": "candle",
"options": ["candle", "iteration"],
"description": "Shuffle frequency",
"help": "Shuffle frequency. Can be either 'candle' or 'iteration'.",
},
"seed": {
"type": "number",
"default": None,
"description": "Random Seed",
"help": "Seed for random number generator. Not used in live mode.",
},
}
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
:param pairlist: pairlist to filter or sort
:param tickers: Tickers (from exchange.get_tickers). May be cached.
:return: new whitelist
"""
pairlist_bef = tuple(pairlist)
pairlist_new = self.__pairlist_cache.get(pairlist_bef)
if pairlist_new and self._shuffle_freq == 'candle':
# Use cached pairlist.
return pairlist_new
# Shuffle is done inplace
self._random.shuffle(pairlist)
self.__pairlist_cache[pairlist_bef] = pairlist
return pairlist