58 lines
2.0 KiB
Python
58 lines
2.0 KiB
Python
"""
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This module loads custom exchanges
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"""
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import logging
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from pathlib import Path
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from freqtrade.exchange import Exchange
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from freqtrade.resolvers import IResolver
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logger = logging.getLogger(__name__)
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class ExchangeResolver(IResolver):
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"""
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This class contains all the logic to load a custom exchange class
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"""
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__slots__ = ['exchange']
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def __init__(self, exchange_name: str, freqtrade, config: dict) -> None:
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"""
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Load the custom class from config parameter
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:param config: configuration dictionary or None
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"""
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self.exchange = self._load_exchange(exchange_name, kwargs={'freqtrade': freqtrade,
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'config': config})
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def _load_exchange(
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self, exchange_name: str, kwargs: dict) -> Exchange:
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"""
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Search and loads the specified exchange.
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:param exchange_name: name of the module to import
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:param extra_dir: additional directory to search for the given exchange
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:return: Exchange instance or None
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"""
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current_path = Path(__file__).parent.parent.joinpath('exchange').resolve()
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abs_paths = [
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current_path.parent.parent.joinpath('user_data/exchange'),
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current_path,
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]
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for _path in abs_paths:
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try:
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exchange = self._search_object(directory=_path, object_type=Exchange,
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object_name=exchange_name,
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kwargs=kwargs)
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if exchange:
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logger.info('Using resolved exchange %s from \'%s\'', exchange_name, _path)
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return exchange
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except FileNotFoundError:
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logger.warning('Path "%s" does not exist', _path.relative_to(Path.cwd()))
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raise ImportError(
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"Impossible to load Exchange '{}'. This class does not exist"
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" or contains Python code errors".format(exchange_name)
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)
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