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