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from typing import Dict, Iterable, Union
from attr import define, field
from .._utils import get_valid_kwargs
from ..models import RichMixin
from . import ExpirationPattern, ExpirationTime, FilterCallback, KeyCallback
ALL_METHODS = ('GET', 'HEAD', 'OPTIONS', 'POST', 'PUT', 'PATCH', 'DELETE')
DEFAULT_CACHE_NAME = 'http_cache'
DEFAULT_METHODS = ('GET', 'HEAD')
DEFAULT_STATUS_CODES = (200,)
# Default params and/or headers that are excluded from cache keys and redacted from cached responses
DEFAULT_IGNORED_PARAMS = ('Authorization', 'X-API-KEY', 'access_token', 'api_key')
@define(repr=False)
class CacheSettings(RichMixin):
"""Class used internally to store settings that affect caching behavior. This allows settings
to be used across multiple modules, but exposed to the user in a single property
(:py:attr:`.CachedSession.settings`). These values can safely be modified after initialization.
See :py:class:`.CachedSession` and :ref:`user-guide` for usage details.
"""
allowable_codes: Iterable[int] = field(default=DEFAULT_STATUS_CODES)
allowable_methods: Iterable[str] = field(default=DEFAULT_METHODS)
always_revalidate: bool = field(default=None)
cache_control: bool = field(default=False)
disabled: bool = field(default=False)
expire_after: ExpirationTime = field(default=None)
filter_fn: FilterCallback = field(default=None)
ignored_parameters: Iterable[str] = field(default=DEFAULT_IGNORED_PARAMS)
key_fn: KeyCallback = field(default=None)
match_headers: Union[Iterable[str], bool] = field(default=False)
only_if_cached: bool = field(default=False)
stale_if_error: Union[bool, ExpirationTime] = field(default=False)
stale_while_revalidate: Union[bool, ExpirationTime] = field(default=False)
urls_expire_after: Dict[ExpirationPattern, ExpirationTime] = field(factory=dict)
@classmethod
def from_kwargs(cls, **kwargs):
"""Constructor with some additional steps:
* Handle some deprecated argument names
* Ignore invalid settings, for easier initialization from mixed ``**kwargs``
"""
kwargs = cls._rename_kwargs(kwargs)
kwargs = get_valid_kwargs(cls.__init__, kwargs)
return cls(**kwargs)
@staticmethod
def _rename_kwargs(kwargs):
if 'old_data_on_error' in kwargs:
kwargs['stale_if_error'] = kwargs.pop('old_data_on_error')
if 'include_get_headers' in kwargs:
kwargs['match_headers'] = kwargs.pop('include_get_headers')
return kwargs
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