stable/freqtrade/resolvers/pairlist_resolver.py
2019-07-28 15:05:17 +02:00

55 lines
1.8 KiB
Python

# pragma pylint: disable=attribute-defined-outside-init
"""
This module load custom hyperopts
"""
import logging
from pathlib import Path
from freqtrade import OperationalException
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 hyperopt class
"""
__slots__ = ['pairlist']
def __init__(self, pairlist_name: str, freqtrade, config: dict) -> None:
"""
Load the custom class from config parameter
:param config: configuration dictionary or None
"""
self.pairlist = self._load_pairlist(pairlist_name, config, kwargs={'freqtrade': freqtrade,
'config': config})
def _load_pairlist(
self, pairlist_name: str, config: dict, kwargs: dict) -> IPairList:
"""
Search and loads the specified pairlist.
:param pairlist_name: name of the module to import
:param config: configuration dictionary
: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 = [
config['user_data_dir'].joinpath('pairlist'),
current_path,
]
pairlist = self._load_object(paths=abs_paths, object_type=IPairList,
object_name=pairlist_name, kwargs=kwargs)
if pairlist:
return pairlist
raise OperationalException(
f"Impossible to load Pairlist '{pairlist_name}'. This class does not exist "
"or contains Python code errors."
)