72 lines
2.3 KiB
Python
72 lines
2.3 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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import freqtrade.exchange as exchanges
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from freqtrade.constants import Config
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from freqtrade.exchange import MAP_EXCHANGE_CHILDCLASS, 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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object_type = Exchange
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@staticmethod
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def load_exchange(exchange_name: str, config: Config, validate: bool = True,
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load_leverage_tiers: bool = False) -> Exchange:
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"""
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Load the custom class from config parameter
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:param exchange_name: name of the Exchange to load
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:param config: configuration dictionary
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"""
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# Map exchange name to avoid duplicate classes for identical exchanges
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exchange_name = MAP_EXCHANGE_CHILDCLASS.get(exchange_name, exchange_name)
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exchange_name = exchange_name.title()
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exchange = None
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try:
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exchange = ExchangeResolver._load_exchange(
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exchange_name,
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kwargs={
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'config': config,
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'validate': validate,
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'load_leverage_tiers': load_leverage_tiers}
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)
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except ImportError:
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logger.info(
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f"No {exchange_name} specific subclass found. Using the generic class instead.")
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if not exchange:
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exchange = Exchange(config, validate=validate)
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return exchange
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@staticmethod
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def _load_exchange(exchange_name: str, kwargs: dict) -> Exchange:
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"""
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Loads the specified exchange.
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Only checks for exchanges exported in freqtrade.exchanges
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:param exchange_name: name of the module to import
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:return: Exchange instance or None
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"""
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try:
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ex_class = getattr(exchanges, exchange_name)
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exchange = ex_class(**kwargs)
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if exchange:
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logger.info(f"Using resolved exchange '{exchange_name}'...")
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return exchange
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except AttributeError:
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# Pass and raise ImportError instead
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pass
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raise ImportError(
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f"Impossible to load Exchange '{exchange_name}'. This class does not exist "
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"or contains Python code errors."
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)
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