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from __future__ import annotations
import importlib.metadata as importlib_metadata
import os
import warnings
from typing import TYPE_CHECKING, Final, Iterable
if TYPE_CHECKING:
from . import PydanticPluginProtocol
PYDANTIC_ENTRY_POINT_GROUP: Final[str] = 'pydantic'
# cache of plugins
_plugins: dict[str, PydanticPluginProtocol] | None = None
# return no plugins while loading plugins to avoid recursion and errors while import plugins
# this means that if plugins use pydantic
_loading_plugins: bool = False
def get_plugins() -> Iterable[PydanticPluginProtocol]:
"""Load plugins for Pydantic.
Inspired by: https://github.com/pytest-dev/pluggy/blob/1.3.0/src/pluggy/_manager.py#L376-L402
"""
disabled_plugins = os.getenv('PYDANTIC_DISABLE_PLUGINS')
global _plugins, _loading_plugins
if _loading_plugins:
# this happens when plugins themselves use pydantic, we return no plugins
return ()
elif disabled_plugins in ('__all__', '1', 'true'):
return ()
elif _plugins is None:
_plugins = {}
# set _loading_plugins so any plugins that use pydantic don't themselves use plugins
_loading_plugins = True
try:
for dist in importlib_metadata.distributions():
for entry_point in dist.entry_points:
if entry_point.group != PYDANTIC_ENTRY_POINT_GROUP:
continue
if entry_point.value in _plugins:
continue
if disabled_plugins is not None and entry_point.name in disabled_plugins.split(','):
continue
try:
_plugins[entry_point.value] = entry_point.load()
except (ImportError, AttributeError) as e:
warnings.warn(
f'{e.__class__.__name__} while loading the `{entry_point.name}` Pydantic plugin, '
f'this plugin will not be installed.\n\n{e!r}'
)
finally:
_loading_plugins = False
return _plugins.values()