44 lines
1.6 KiB
Python
44 lines
1.6 KiB
Python
import logging
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from collections.abc import Callable
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from copy import deepcopy
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from functools import wraps
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from typing import Any, TypeVar, cast
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from freqtrade.exceptions import StrategyError
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logger = logging.getLogger(__name__)
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F = TypeVar("F", bound=Callable[..., Any])
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def strategy_safe_wrapper(f: F, message: str = "", default_retval=None, supress_error=False) -> F:
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"""
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Wrapper around user-provided methods and functions.
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Caches all exceptions and returns either the default_retval (if it's not None) or raises
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a StrategyError exception, which then needs to be handled by the calling method.
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"""
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@wraps(f)
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def wrapper(*args, **kwargs):
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try:
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if not (getattr(f, "__qualname__", "")).startswith("IStrategy."):
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# Don't deep-copy if the function is not implemented in the user strategy.``
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if "trade" in kwargs:
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# Protect accidental modifications from within the strategy
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kwargs["trade"] = deepcopy(kwargs["trade"])
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return f(*args, **kwargs)
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except ValueError as error:
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logger.warning(f"{message}Strategy caused the following exception: {error}{f}")
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if default_retval is None and not supress_error:
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raise StrategyError(str(error)) from error
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return default_retval
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except Exception as error:
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logger.exception(f"{message}Unexpected error {error} calling {f}")
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if default_retval is None and not supress_error:
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raise StrategyError(str(error)) from error
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return default_retval
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return cast(F, wrapper)
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