147 lines
5.3 KiB
Python
147 lines
5.3 KiB
Python
"""
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Remote PairList provider
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Provides pair list fetched from a remote source
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"""
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import json
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import logging
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from typing import Any, Dict, List
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import requests
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from cachetools import TTLCache
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from freqtrade.constants import Config
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from freqtrade.exceptions import OperationalException
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from freqtrade.exchange.types import Tickers
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from freqtrade.plugins.pairlist.IPairList import IPairList
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logger = logging.getLogger(__name__)
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class RemotePairList(IPairList):
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def __init__(self, exchange, pairlistmanager,
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config: Config, 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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if 'number_assets' not in self._pairlistconfig:
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raise OperationalException(
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'`number_assets` not specified. Please check your configuration '
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'for "pairlist.config.number_assets"')
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if 'pairlist_url' not in self._pairlistconfig:
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raise OperationalException(
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'`pairlist_url` not specified. Please check your configuration '
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'for "pairlist.config.pairlist_url"')
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self._number_pairs = self._pairlistconfig['number_assets']
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self._refresh_period = self._pairlistconfig.get('refresh_period', 1800)
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self._keep_pairlist_on_failure = self._pairlistconfig.get('keep_pairlist_on_failure', True)
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self._pair_cache: TTLCache = TTLCache(maxsize=1, ttl=self._refresh_period)
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self._pairlist_url = self._pairlistconfig.get('pairlist_url', '')
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self._read_timeout = self._pairlistconfig.get('read_timeout', 60)
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self._last_pairlist: List[Any] = list()
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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 Dict 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} - {self._pairlistconfig['number_assets']} pairs from RemotePairlist."
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def gen_pairlist(self, tickers: Tickers) -> List[str]:
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"""
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Generate the pairlist
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:param tickers: Tickers (from exchange.get_tickers). May be cached.
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:return: List of pairs
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"""
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pairlist = self._pair_cache.get('pairlist')
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info = ""
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if pairlist:
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# Item found - no refresh necessary
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return pairlist.copy()
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else:
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# Fetch Pairlist from Remote
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headers = {
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'User-Agent': 'Freqtrade - Remotepairlist',
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}
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try:
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response = requests.get(self._pairlist_url, headers=headers,
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timeout=self._read_timeout)
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content_type = response.headers.get('content-type')
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time_elapsed = response.elapsed.total_seconds()
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rsplit = response.text.split("#")
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if "text/html" in str(content_type):
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if len(rsplit) > 1:
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plist = rsplit[0].strip()
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plist = json.loads(plist)
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info = rsplit[1].strip()
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else:
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plist = json.loads(rsplit[0])
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elif "application/json" in str(content_type):
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jsonp = json.loads(' '.join(rsplit))
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plist = jsonp['pairs']
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info = jsonp['info']
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except requests.exceptions.RequestException:
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self.log_once(f'Was not able to fetch pairlist from:'
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f' {self._pairlist_url}', logger.info)
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if self._keep_pairlist_on_failure:
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plist = str(self._last_pairlist)
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self.log_once('Keeping last fetched pairlist', logger.info)
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else:
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plist = ""
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time_elapsed = 0
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pairlist = []
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for i in plist:
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if i not in pairlist:
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pairlist.append(i)
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else:
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continue
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pairlist = self.filter_pairlist(pairlist, tickers)
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self._pair_cache['pairlist'] = pairlist.copy()
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if(time_elapsed):
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self.log_once(info + " | " + " Fetched in " + str(time_elapsed) +
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" seconds.", logger.info)
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self._last_pairlist = list(pairlist)
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return pairlist
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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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# Validate whitelist to only have active market pairs
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pairlist = self._whitelist_for_active_markets(pairlist)
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pairlist = self.verify_blacklist(pairlist, logger.info)
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# Limit pairlist to the requested number of pairs
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pairlist = pairlist[:self._number_pairs]
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self.log_once(f"Searching {self._number_pairs} pairs: {pairlist}", logger.info)
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return pairlist
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