stable/freqtrade/resolvers/pairlist_resolver.py

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# pragma pylint: disable=attribute-defined-outside-init
"""
This module load custom pairlists
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"""
import logging
from pathlib import Path
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from freqtrade import OperationalException
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from freqtrade.pairlist.IPairList import IPairList
from freqtrade.resolvers import IResolver
logger = logging.getLogger(__name__)
class PairListResolver(IResolver):
"""
This class contains all the logic to load custom PairList class
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"""
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object_type = IPairList
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@staticmethod
def load_pairlist(pairlist_name: str, exchange, pairlistmanager,
config: dict, pairlistconfig: dict, pairlist_pos: int) -> IPairList:
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"""
Load the pairlist with pairlist_name
:param pairlist_name: Classname of the pairlist
:param exchange: Initialized exchange class
:param pairlistmanager: Initialized pairlist manager
:param config: configuration dictionary
:param pairlistconfig: Configuration dedicated to this pairlist
:param pairlist_pos: Position of the pairlist in the list of pairlists
:return: initialized Pairlist class
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"""
return PairListResolver._load_pairlist(pairlist_name, config,
kwargs={'exchange': exchange,
'pairlistmanager': pairlistmanager,
'config': config,
'pairlistconfig': pairlistconfig,
'pairlist_pos': pairlist_pos})
@staticmethod
def _load_pairlist(pairlist_name: str, config: dict, kwargs: dict) -> IPairList:
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"""
Search and loads the specified pairlist.
:param pairlist_name: name of the module to import
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:param config: configuration dictionary
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:param extra_dir: additional directory to search for the given pairlist
:return: PairList instance or None
"""
current_path = Path(__file__).parent.parent.joinpath('pairlist').resolve()
abs_paths = IResolver.build_search_paths(config, current_path=current_path,
user_subdir=None, extra_dir=None)
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pairlist = PairListResolver._load_object(paths=abs_paths,
object_name=pairlist_name,
kwargs=kwargs)
if pairlist:
return pairlist
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raise OperationalException(
f"Impossible to load Pairlist '{pairlist_name}'. This class does not exist "
"or contains Python code errors."
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)