56 lines
2.0 KiB
Python
56 lines
2.0 KiB
Python
import logging
|
|
from functools import wraps
|
|
from typing import Any, Callable, TypeVar, cast
|
|
|
|
from freqtrade.exceptions import StrategyError
|
|
from freqtrade.persistence import Trade
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
F = TypeVar('F', bound=Callable[..., Any])
|
|
|
|
|
|
def strategy_safe_wrapper(f: F, message: str = "", default_retval=None, supress_error=False) -> F:
|
|
"""
|
|
Wrapper around user-provided methods and functions.
|
|
Caches all exceptions and returns either the default_retval (if it's not None) or raises
|
|
a StrategyError exception, which then needs to be handled by the calling method.
|
|
"""
|
|
@wraps(f)
|
|
def wrapper(*args, **kwargs):
|
|
try:
|
|
if 'trade' in kwargs:
|
|
# Protect accidental modifications from within the strategy
|
|
trade = kwargs['trade']
|
|
if isinstance(trade, Trade):
|
|
if trade in Trade.query.session.dirty:
|
|
Trade.commit()
|
|
return_vals = f(*args, **kwargs)
|
|
if trade in Trade.query.session.dirty:
|
|
logger.warning(f"The `trade` parameter have changed "
|
|
f"in the function `{f.__name__}`, this may "
|
|
f"lead to unexpected behavior.")
|
|
return return_vals
|
|
return f(*args, **kwargs)
|
|
except ValueError as error:
|
|
logger.warning(
|
|
f"{message}"
|
|
f"Strategy caused the following exception: {error}"
|
|
f"{f}"
|
|
)
|
|
if default_retval is None and not supress_error:
|
|
raise StrategyError(str(error)) from error
|
|
return default_retval
|
|
except Exception as error:
|
|
logger.exception(
|
|
f"{message}"
|
|
f"Unexpected error {error} calling {f}"
|
|
)
|
|
if default_retval is None and not supress_error:
|
|
raise StrategyError(str(error)) from error
|
|
return default_retval
|
|
|
|
return cast(F, wrapper)
|