692 lines
23 KiB
Python
692 lines
23 KiB
Python
"""
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Internal hook annotation, representation and calling machinery.
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"""
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from __future__ import annotations
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import inspect
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import sys
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import warnings
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from types import ModuleType
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from typing import AbstractSet
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from typing import Any
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from typing import Callable
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from typing import Final
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from typing import final
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from typing import Generator
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from typing import List
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from typing import Mapping
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from typing import Optional
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from typing import overload
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from typing import Sequence
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from typing import Tuple
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from typing import TYPE_CHECKING
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from typing import TypedDict
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from typing import TypeVar
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from typing import Union
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from ._result import Result
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_T = TypeVar("_T")
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_F = TypeVar("_F", bound=Callable[..., object])
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_Namespace = Union[ModuleType, type]
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_Plugin = object
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_HookExec = Callable[
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[str, Sequence["HookImpl"], Mapping[str, object], bool],
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Union[object, List[object]],
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]
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_HookImplFunction = Callable[..., Union[_T, Generator[None, Result[_T], None]]]
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class HookspecOpts(TypedDict):
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"""Options for a hook specification."""
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#: Whether the hook is :ref:`first result only <firstresult>`.
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firstresult: bool
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#: Whether the hook is :ref:`historic <historic>`.
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historic: bool
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#: Whether the hook :ref:`warns when implemented <warn_on_impl>`.
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warn_on_impl: Warning | None
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class HookimplOpts(TypedDict):
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"""Options for a hook implementation."""
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#: Whether the hook implementation is a :ref:`wrapper <hookwrapper>`.
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wrapper: bool
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#: Whether the hook implementation is an :ref:`old-style wrapper
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#: <old_style_hookwrappers>`.
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hookwrapper: bool
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#: Whether validation against a hook specification is :ref:`optional
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#: <optionalhook>`.
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optionalhook: bool
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#: Whether to try to order this hook implementation :ref:`first
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#: <callorder>`.
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tryfirst: bool
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#: Whether to try to order this hook implementation :ref:`last
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#: <callorder>`.
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trylast: bool
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#: The name of the hook specification to match, see :ref:`specname`.
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specname: str | None
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@final
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class HookspecMarker:
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"""Decorator for marking functions as hook specifications.
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Instantiate it with a project_name to get a decorator.
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Calling :meth:`PluginManager.add_hookspecs` later will discover all marked
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functions if the :class:`PluginManager` uses the same project name.
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"""
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__slots__ = ("project_name",)
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def __init__(self, project_name: str) -> None:
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self.project_name: Final = project_name
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@overload
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def __call__(
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self,
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function: _F,
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firstresult: bool = False,
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historic: bool = False,
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warn_on_impl: Warning | None = None,
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) -> _F:
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...
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@overload # noqa: F811
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def __call__( # noqa: F811
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self,
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function: None = ...,
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firstresult: bool = ...,
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historic: bool = ...,
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warn_on_impl: Warning | None = ...,
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) -> Callable[[_F], _F]:
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...
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def __call__( # noqa: F811
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self,
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function: _F | None = None,
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firstresult: bool = False,
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historic: bool = False,
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warn_on_impl: Warning | None = None,
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) -> _F | Callable[[_F], _F]:
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"""If passed a function, directly sets attributes on the function
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which will make it discoverable to :meth:`PluginManager.add_hookspecs`.
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If passed no function, returns a decorator which can be applied to a
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function later using the attributes supplied.
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:param firstresult:
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If ``True``, the 1:N hook call (N being the number of registered
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hook implementation functions) will stop at I<=N when the I'th
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function returns a non-``None`` result. See :ref:`firstresult`.
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:param historic:
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If ``True``, every call to the hook will be memorized and replayed
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on plugins registered after the call was made. See :ref:`historic`.
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:param warn_on_impl:
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If given, every implementation of this hook will trigger the given
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warning. See :ref:`warn_on_impl`.
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"""
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def setattr_hookspec_opts(func: _F) -> _F:
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if historic and firstresult:
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raise ValueError("cannot have a historic firstresult hook")
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opts: HookspecOpts = {
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"firstresult": firstresult,
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"historic": historic,
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"warn_on_impl": warn_on_impl,
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}
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setattr(func, self.project_name + "_spec", opts)
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return func
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if function is not None:
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return setattr_hookspec_opts(function)
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else:
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return setattr_hookspec_opts
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@final
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class HookimplMarker:
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"""Decorator for marking functions as hook implementations.
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Instantiate it with a ``project_name`` to get a decorator.
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Calling :meth:`PluginManager.register` later will discover all marked
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functions if the :class:`PluginManager` uses the same project name.
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"""
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__slots__ = ("project_name",)
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def __init__(self, project_name: str) -> None:
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self.project_name: Final = project_name
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@overload
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def __call__(
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self,
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function: _F,
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hookwrapper: bool = ...,
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optionalhook: bool = ...,
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tryfirst: bool = ...,
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trylast: bool = ...,
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specname: str | None = ...,
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wrapper: bool = ...,
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) -> _F:
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...
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@overload # noqa: F811
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def __call__( # noqa: F811
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self,
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function: None = ...,
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hookwrapper: bool = ...,
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optionalhook: bool = ...,
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tryfirst: bool = ...,
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trylast: bool = ...,
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specname: str | None = ...,
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wrapper: bool = ...,
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) -> Callable[[_F], _F]:
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...
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def __call__( # noqa: F811
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self,
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function: _F | None = None,
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hookwrapper: bool = False,
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optionalhook: bool = False,
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tryfirst: bool = False,
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trylast: bool = False,
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specname: str | None = None,
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wrapper: bool = False,
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) -> _F | Callable[[_F], _F]:
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"""If passed a function, directly sets attributes on the function
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which will make it discoverable to :meth:`PluginManager.register`.
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If passed no function, returns a decorator which can be applied to a
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function later using the attributes supplied.
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:param optionalhook:
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If ``True``, a missing matching hook specification will not result
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in an error (by default it is an error if no matching spec is
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found). See :ref:`optionalhook`.
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:param tryfirst:
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If ``True``, this hook implementation will run as early as possible
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in the chain of N hook implementations for a specification. See
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:ref:`callorder`.
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:param trylast:
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If ``True``, this hook implementation will run as late as possible
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in the chain of N hook implementations for a specification. See
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:ref:`callorder`.
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:param wrapper:
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If ``True`` ("new-style hook wrapper"), the hook implementation
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needs to execute exactly one ``yield``. The code before the
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``yield`` is run early before any non-hook-wrapper function is run.
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The code after the ``yield`` is run after all non-hook-wrapper
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functions have run. The ``yield`` receives the result value of the
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inner calls, or raises the exception of inner calls (including
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earlier hook wrapper calls). The return value of the function
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becomes the return value of the hook, and a raised exception becomes
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the exception of the hook. See :ref:`hookwrapper`.
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:param hookwrapper:
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If ``True`` ("old-style hook wrapper"), the hook implementation
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needs to execute exactly one ``yield``. The code before the
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``yield`` is run early before any non-hook-wrapper function is run.
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The code after the ``yield`` is run after all non-hook-wrapper
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function have run The ``yield`` receives a :class:`Result` object
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representing the exception or result outcome of the inner calls
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(including earlier hook wrapper calls). This option is mutually
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exclusive with ``wrapper``. See :ref:`old_style_hookwrapper`.
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:param specname:
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If provided, the given name will be used instead of the function
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name when matching this hook implementation to a hook specification
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during registration. See :ref:`specname`.
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.. versionadded:: 1.2.0
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The ``wrapper`` parameter.
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"""
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def setattr_hookimpl_opts(func: _F) -> _F:
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opts: HookimplOpts = {
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"wrapper": wrapper,
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"hookwrapper": hookwrapper,
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"optionalhook": optionalhook,
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"tryfirst": tryfirst,
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"trylast": trylast,
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"specname": specname,
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}
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setattr(func, self.project_name + "_impl", opts)
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return func
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if function is None:
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return setattr_hookimpl_opts
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else:
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return setattr_hookimpl_opts(function)
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def normalize_hookimpl_opts(opts: HookimplOpts) -> None:
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opts.setdefault("tryfirst", False)
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opts.setdefault("trylast", False)
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opts.setdefault("wrapper", False)
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opts.setdefault("hookwrapper", False)
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opts.setdefault("optionalhook", False)
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opts.setdefault("specname", None)
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_PYPY = hasattr(sys, "pypy_version_info")
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def varnames(func: object) -> tuple[tuple[str, ...], tuple[str, ...]]:
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"""Return tuple of positional and keywrord argument names for a function,
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method, class or callable.
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In case of a class, its ``__init__`` method is considered.
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For methods the ``self`` parameter is not included.
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"""
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if inspect.isclass(func):
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try:
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func = func.__init__
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except AttributeError:
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return (), ()
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elif not inspect.isroutine(func): # callable object?
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try:
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func = getattr(func, "__call__", func)
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except Exception:
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return (), ()
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try:
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# func MUST be a function or method here or we won't parse any args.
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sig = inspect.signature(
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func.__func__ if inspect.ismethod(func) else func # type:ignore[arg-type]
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)
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except TypeError:
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return (), ()
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_valid_param_kinds = (
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inspect.Parameter.POSITIONAL_ONLY,
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inspect.Parameter.POSITIONAL_OR_KEYWORD,
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)
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_valid_params = {
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name: param
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for name, param in sig.parameters.items()
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if param.kind in _valid_param_kinds
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}
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args = tuple(_valid_params)
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defaults = (
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tuple(
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param.default
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for param in _valid_params.values()
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if param.default is not param.empty
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)
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or None
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)
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if defaults:
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index = -len(defaults)
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args, kwargs = args[:index], tuple(args[index:])
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else:
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kwargs = ()
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# strip any implicit instance arg
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# pypy3 uses "obj" instead of "self" for default dunder methods
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if not _PYPY:
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implicit_names: tuple[str, ...] = ("self",)
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else:
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implicit_names = ("self", "obj")
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if args:
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qualname: str = getattr(func, "__qualname__", "")
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if inspect.ismethod(func) or ("." in qualname and args[0] in implicit_names):
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args = args[1:]
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return args, kwargs
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@final
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class HookRelay:
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"""Hook holder object for performing 1:N hook calls where N is the number
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of registered plugins."""
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__slots__ = ("__dict__",)
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def __init__(self) -> None:
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""":meta private:"""
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if TYPE_CHECKING:
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def __getattr__(self, name: str) -> HookCaller:
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...
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# Historical name (pluggy<=1.2), kept for backward compatibility.
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_HookRelay = HookRelay
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_CallHistory = List[Tuple[Mapping[str, object], Optional[Callable[[Any], None]]]]
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class HookCaller:
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"""A caller of all registered implementations of a hook specification."""
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__slots__ = (
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"name",
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"spec",
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"_hookexec",
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"_hookimpls",
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"_call_history",
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)
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def __init__(
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self,
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name: str,
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hook_execute: _HookExec,
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specmodule_or_class: _Namespace | None = None,
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spec_opts: HookspecOpts | None = None,
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) -> None:
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""":meta private:"""
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#: Name of the hook getting called.
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self.name: Final = name
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self._hookexec: Final = hook_execute
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self._hookimpls: Final[list[HookImpl]] = []
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self._call_history: _CallHistory | None = None
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# TODO: Document, or make private.
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self.spec: HookSpec | None = None
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if specmodule_or_class is not None:
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assert spec_opts is not None
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self.set_specification(specmodule_or_class, spec_opts)
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# TODO: Document, or make private.
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def has_spec(self) -> bool:
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return self.spec is not None
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# TODO: Document, or make private.
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def set_specification(
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self,
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specmodule_or_class: _Namespace,
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spec_opts: HookspecOpts,
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) -> None:
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if self.spec is not None:
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raise ValueError(
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f"Hook {self.spec.name!r} is already registered "
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f"within namespace {self.spec.namespace}"
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)
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self.spec = HookSpec(specmodule_or_class, self.name, spec_opts)
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if spec_opts.get("historic"):
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self._call_history = []
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def is_historic(self) -> bool:
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"""Whether this caller is :ref:`historic <historic>`."""
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return self._call_history is not None
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def _remove_plugin(self, plugin: _Plugin) -> None:
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for i, method in enumerate(self._hookimpls):
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if method.plugin == plugin:
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del self._hookimpls[i]
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return
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raise ValueError(f"plugin {plugin!r} not found")
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def get_hookimpls(self) -> list[HookImpl]:
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"""Get all registered hook implementations for this hook."""
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return self._hookimpls.copy()
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def _add_hookimpl(self, hookimpl: HookImpl) -> None:
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"""Add an implementation to the callback chain."""
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for i, method in enumerate(self._hookimpls):
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if method.hookwrapper or method.wrapper:
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splitpoint = i
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break
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else:
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splitpoint = len(self._hookimpls)
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if hookimpl.hookwrapper or hookimpl.wrapper:
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start, end = splitpoint, len(self._hookimpls)
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else:
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start, end = 0, splitpoint
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if hookimpl.trylast:
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self._hookimpls.insert(start, hookimpl)
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elif hookimpl.tryfirst:
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self._hookimpls.insert(end, hookimpl)
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else:
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# find last non-tryfirst method
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i = end - 1
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while i >= start and self._hookimpls[i].tryfirst:
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i -= 1
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self._hookimpls.insert(i + 1, hookimpl)
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def __repr__(self) -> str:
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return f"<HookCaller {self.name!r}>"
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def _verify_all_args_are_provided(self, kwargs: Mapping[str, object]) -> None:
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# This is written to avoid expensive operations when not needed.
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if self.spec:
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for argname in self.spec.argnames:
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if argname not in kwargs:
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notincall = ", ".join(
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repr(argname)
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for argname in self.spec.argnames
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# Avoid self.spec.argnames - kwargs.keys() - doesn't preserve order.
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if argname not in kwargs.keys()
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)
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warnings.warn(
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"Argument(s) {} which are declared in the hookspec "
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"cannot be found in this hook call".format(notincall),
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stacklevel=2,
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)
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break
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def __call__(self, **kwargs: object) -> Any:
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"""Call the hook.
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Only accepts keyword arguments, which should match the hook
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specification.
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Returns the result(s) of calling all registered plugins, see
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:ref:`calling`.
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"""
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assert (
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not self.is_historic()
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), "Cannot directly call a historic hook - use call_historic instead."
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self._verify_all_args_are_provided(kwargs)
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firstresult = self.spec.opts.get("firstresult", False) if self.spec else False
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return self._hookexec(self.name, self._hookimpls, kwargs, firstresult)
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def call_historic(
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self,
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result_callback: Callable[[Any], None] | None = None,
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kwargs: Mapping[str, object] | None = None,
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) -> None:
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"""Call the hook with given ``kwargs`` for all registered plugins and
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for all plugins which will be registered afterwards, see
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:ref:`historic`.
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:param result_callback:
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If provided, will be called for each non-``None`` result obtained
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from a hook implementation.
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"""
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assert self._call_history is not None
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kwargs = kwargs or {}
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self._verify_all_args_are_provided(kwargs)
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self._call_history.append((kwargs, result_callback))
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# Historizing hooks don't return results.
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# Remember firstresult isn't compatible with historic.
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res = self._hookexec(self.name, self._hookimpls, kwargs, False)
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if result_callback is None:
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return
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if isinstance(res, list):
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for x in res:
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result_callback(x)
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def call_extra(
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self, methods: Sequence[Callable[..., object]], kwargs: Mapping[str, object]
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) -> Any:
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"""Call the hook with some additional temporarily participating
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methods using the specified ``kwargs`` as call parameters, see
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:ref:`call_extra`."""
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assert (
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not self.is_historic()
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), "Cannot directly call a historic hook - use call_historic instead."
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self._verify_all_args_are_provided(kwargs)
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opts: HookimplOpts = {
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"wrapper": False,
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"hookwrapper": False,
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"optionalhook": False,
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"trylast": False,
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"tryfirst": False,
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"specname": None,
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}
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hookimpls = self._hookimpls.copy()
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for method in methods:
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hookimpl = HookImpl(None, "<temp>", method, opts)
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# Find last non-tryfirst nonwrapper method.
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i = len(hookimpls) - 1
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while (
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|
i >= 0
|
|
and hookimpls[i].tryfirst
|
|
and not (hookimpls[i].hookwrapper or hookimpls[i].wrapper)
|
|
):
|
|
i -= 1
|
|
hookimpls.insert(i + 1, hookimpl)
|
|
firstresult = self.spec.opts.get("firstresult", False) if self.spec else False
|
|
return self._hookexec(self.name, hookimpls, kwargs, firstresult)
|
|
|
|
def _maybe_apply_history(self, method: HookImpl) -> None:
|
|
"""Apply call history to a new hookimpl if it is marked as historic."""
|
|
if self.is_historic():
|
|
assert self._call_history is not None
|
|
for kwargs, result_callback in self._call_history:
|
|
res = self._hookexec(self.name, [method], kwargs, False)
|
|
if res and result_callback is not None:
|
|
# XXX: remember firstresult isn't compat with historic
|
|
assert isinstance(res, list)
|
|
result_callback(res[0])
|
|
|
|
|
|
# Historical name (pluggy<=1.2), kept for backward compatibility.
|
|
_HookCaller = HookCaller
|
|
|
|
|
|
class _SubsetHookCaller(HookCaller):
|
|
"""A proxy to another HookCaller which manages calls to all registered
|
|
plugins except the ones from remove_plugins."""
|
|
|
|
# This class is unusual: in inhertits from `HookCaller` so all of
|
|
# the *code* runs in the class, but it delegates all underlying *data*
|
|
# to the original HookCaller.
|
|
# `subset_hook_caller` used to be implemented by creating a full-fledged
|
|
# HookCaller, copying all hookimpls from the original. This had problems
|
|
# with memory leaks (#346) and historic calls (#347), which make a proxy
|
|
# approach better.
|
|
# An alternative implementation is to use a `_getattr__`/`__getattribute__`
|
|
# proxy, however that adds more overhead and is more tricky to implement.
|
|
|
|
__slots__ = (
|
|
"_orig",
|
|
"_remove_plugins",
|
|
)
|
|
|
|
def __init__(self, orig: HookCaller, remove_plugins: AbstractSet[_Plugin]) -> None:
|
|
self._orig = orig
|
|
self._remove_plugins = remove_plugins
|
|
self.name = orig.name # type: ignore[misc]
|
|
self._hookexec = orig._hookexec # type: ignore[misc]
|
|
|
|
@property # type: ignore[misc]
|
|
def _hookimpls(self) -> list[HookImpl]:
|
|
return [
|
|
impl
|
|
for impl in self._orig._hookimpls
|
|
if impl.plugin not in self._remove_plugins
|
|
]
|
|
|
|
@property
|
|
def spec(self) -> HookSpec | None: # type: ignore[override]
|
|
return self._orig.spec
|
|
|
|
@property
|
|
def _call_history(self) -> _CallHistory | None: # type: ignore[override]
|
|
return self._orig._call_history
|
|
|
|
def __repr__(self) -> str:
|
|
return f"<_SubsetHookCaller {self.name!r}>"
|
|
|
|
|
|
@final
|
|
class HookImpl:
|
|
"""A hook implementation in a :class:`HookCaller`."""
|
|
|
|
__slots__ = (
|
|
"function",
|
|
"argnames",
|
|
"kwargnames",
|
|
"plugin",
|
|
"opts",
|
|
"plugin_name",
|
|
"wrapper",
|
|
"hookwrapper",
|
|
"optionalhook",
|
|
"tryfirst",
|
|
"trylast",
|
|
)
|
|
|
|
def __init__(
|
|
self,
|
|
plugin: _Plugin,
|
|
plugin_name: str,
|
|
function: _HookImplFunction[object],
|
|
hook_impl_opts: HookimplOpts,
|
|
) -> None:
|
|
""":meta private:"""
|
|
#: The hook implementation function.
|
|
self.function: Final = function
|
|
argnames, kwargnames = varnames(self.function)
|
|
#: The positional parameter names of ``function```.
|
|
self.argnames: Final = argnames
|
|
#: The keyword parameter names of ``function```.
|
|
self.kwargnames: Final = kwargnames
|
|
#: The plugin which defined this hook implementation.
|
|
self.plugin: Final = plugin
|
|
#: The :class:`HookimplOpts` used to configure this hook implementation.
|
|
self.opts: Final = hook_impl_opts
|
|
#: The name of the plugin which defined this hook implementation.
|
|
self.plugin_name: Final = plugin_name
|
|
#: Whether the hook implementation is a :ref:`wrapper <hookwrapper>`.
|
|
self.wrapper: Final = hook_impl_opts["wrapper"]
|
|
#: Whether the hook implementation is an :ref:`old-style wrapper
|
|
#: <old_style_hookwrappers>`.
|
|
self.hookwrapper: Final = hook_impl_opts["hookwrapper"]
|
|
#: Whether validation against a hook specification is :ref:`optional
|
|
#: <optionalhook>`.
|
|
self.optionalhook: Final = hook_impl_opts["optionalhook"]
|
|
#: Whether to try to order this hook implementation :ref:`first
|
|
#: <callorder>`.
|
|
self.tryfirst: Final = hook_impl_opts["tryfirst"]
|
|
#: Whether to try to order this hook implementation :ref:`last
|
|
#: <callorder>`.
|
|
self.trylast: Final = hook_impl_opts["trylast"]
|
|
|
|
def __repr__(self) -> str:
|
|
return f"<HookImpl plugin_name={self.plugin_name!r}, plugin={self.plugin!r}>"
|
|
|
|
|
|
@final
|
|
class HookSpec:
|
|
__slots__ = (
|
|
"namespace",
|
|
"function",
|
|
"name",
|
|
"argnames",
|
|
"kwargnames",
|
|
"opts",
|
|
"warn_on_impl",
|
|
)
|
|
|
|
def __init__(self, namespace: _Namespace, name: str, opts: HookspecOpts) -> None:
|
|
self.namespace = namespace
|
|
self.function: Callable[..., object] = getattr(namespace, name)
|
|
self.name = name
|
|
self.argnames, self.kwargnames = varnames(self.function)
|
|
self.opts = opts
|
|
self.warn_on_impl = opts.get("warn_on_impl")
|