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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"""
__slots__ = ['pairlist']
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def __init__(self, pairlist_name: str, exchange, config: dict, pairlistconfig) -> None:
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"""
Load the custom class from config parameter
:param config: configuration dictionary or None
"""
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self.pairlist = self._load_pairlist(pairlist_name, config,
kwargs={'exchange': exchange,
'config': config,
'pairlistconfig': pairlistconfig})
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def _load_pairlist(
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self, 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 = self.build_search_paths(config, current_path=current_path,
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user_subdir=None, extra_dir=None)
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pairlist = self._load_object(paths=abs_paths, object_type=IPairList,
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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)