stable/freqtrade/pairlist/VolumePairList.py
2019-10-30 15:59:52 +01:00

82 lines
3.0 KiB
Python

"""
Volume PairList provider
Provides lists as configured in config.json
"""
import logging
from typing import List
from cachetools import TTLCache, cached
from freqtrade import OperationalException
from freqtrade.pairlist.IPairList import IPairList
logger = logging.getLogger(__name__)
SORT_VALUES = ['askVolume', 'bidVolume', 'quoteVolume']
class VolumePairList(IPairList):
def __init__(self, freqtrade, config: dict) -> None:
super().__init__(freqtrade, config)
self._whitelistconf = self._config.get('pairlist', {}).get('config')
if 'number_assets' not in self._whitelistconf:
raise OperationalException(
f'`number_assets` not specified. Please check your configuration '
'for "pairlist.config.number_assets"')
self._number_pairs = self._whitelistconf['number_assets']
self._sort_key = self._whitelistconf.get('sort_key', 'quoteVolume')
self._precision_filter = self._whitelistconf.get('precision_filter', True)
if not self._freqtrade.exchange.exchange_has('fetchTickers'):
raise OperationalException(
'Exchange does not support dynamic whitelist.'
'Please edit your config and restart the bot'
)
if not self._validate_keys(self._sort_key):
raise OperationalException(
f'key {self._sort_key} not in {SORT_VALUES}')
def _validate_keys(self, key):
return key in SORT_VALUES
def short_desc(self) -> str:
"""
Short whitelist method description - used for startup-messages
-> Please overwrite in subclasses
"""
return f"{self.name} - top {self._whitelistconf['number_assets']} volume pairs."
def refresh_pairlist(self) -> None:
"""
Refreshes pairlists and assigns them to self._whitelist and self._blacklist respectively
-> Please overwrite in subclasses
"""
# Generate dynamic whitelist
self._whitelist = self._gen_pair_whitelist(
self._config['stake_currency'], self._sort_key)
@cached(TTLCache(maxsize=1, ttl=1800))
def _gen_pair_whitelist(self, base_currency: str, key: str) -> List[str]:
"""
Updates the whitelist with with a dynamically generated list
:param base_currency: base currency as str
:param key: sort key (defaults to 'quoteVolume')
:return: List of pairs
"""
tickers = self._freqtrade.exchange.get_tickers()
# check length so that we make sure that '/' is actually in the string
tickers = [v for k, v in tickers.items()
if (len(k.split('/')) == 2 and k.split('/')[1] == base_currency
and v[key] is not None)]
sorted_tickers = sorted(tickers, reverse=True, key=lambda t: t[key])
# Validate whitelist to only have active market pairs
pairs = self.validate_whitelist([s['symbol'] for s in sorted_tickers], tickers)
logger.info(f"Searching {self._number_pairs} pairs: {pairs[:self._number_pairs]}")
return pairs