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_hooks.py
""" Internal hook annotation, representation and calling machinery. """ from __future__ import annotations import inspect import sys import warnings from types import ModuleType from typing import AbstractSet from typing import Any from typing import Callable from typing import Generator from typing import List from typing import Mapping from typing import Optional from typing import overload from typing import Sequence from typing import Tuple from typing import TYPE_CHECKING from typing import TypeVar from typing import Union from ._result import _Result if TYPE_CHECKING: from typing_extensions import TypedDict from typing_extensions import Final _T = TypeVar("_T") _F = TypeVar("_F", bound=Callable[..., object]) _Namespace = Union[ModuleType, type] _Plugin = object _HookExec = Callable[ [str, Sequence["HookImpl"], Mapping[str, object], bool], Union[object, List[object]], ] _HookImplFunction = Callable[..., Union[_T, Generator[None, _Result[_T], None]]] if TYPE_CHECKING: class _HookSpecOpts(TypedDict): firstresult: bool historic: bool warn_on_impl: Warning | None class _HookImplOpts(TypedDict): wrapper: bool hookwrapper: bool optionalhook: bool tryfirst: bool trylast: bool specname: str | None class HookspecMarker: """Decorator for marking functions as hook specifications. Instantiate it with a project_name to get a decorator. Calling :meth:`PluginManager.add_hookspecs` later will discover all marked functions if the :class:`PluginManager` uses the same project_name. """ __slots__ = ("project_name",) def __init__(self, project_name: str) -> None: self.project_name: Final = project_name @overload def __call__( self, function: _F, firstresult: bool = False, historic: bool = False, warn_on_impl: Warning | None = None, ) -> _F: ... @overload # noqa: F811 def __call__( # noqa: F811 self, function: None = ..., firstresult: bool = ..., historic: bool = ..., warn_on_impl: Warning | None = ..., ) -> Callable[[_F], _F]: ... def __call__( # noqa: F811 self, function: _F | None = None, firstresult: bool = False, historic: bool = False, warn_on_impl: Warning | None = None, ) -> _F | Callable[[_F], _F]: """If passed a function, directly sets attributes on the function which will make it discoverable to :meth:`PluginManager.add_hookspecs`. If passed no function, returns a decorator which can be applied to a function later using the attributes supplied. If ``firstresult`` is ``True``, the 1:N hook call (N being the number of registered hook implementation functions) will stop at I<=N when the I'th function returns a non-``None`` result. If ``historic`` is ``True``, every call to the hook will be memorized and replayed on plugins registered after the call was made. """ def setattr_hookspec_opts(func: _F) -> _F: if historic and firstresult: raise ValueError("cannot have a historic firstresult hook") opts: _HookSpecOpts = { "firstresult": firstresult, "historic": historic, "warn_on_impl": warn_on_impl, } setattr(func, self.project_name + "_spec", opts) return func if function is not None: return setattr_hookspec_opts(function) else: return setattr_hookspec_opts class HookimplMarker: """Decorator for marking functions as hook implementations. Instantiate it with a ``project_name`` to get a decorator. Calling :meth:`PluginManager.register` later will discover all marked functions if the :class:`PluginManager` uses the same project_name. """ __slots__ = ("project_name",) def __init__(self, project_name: str) -> None: self.project_name: Final = project_name @overload def __call__( self, function: _F, hookwrapper: bool = ..., optionalhook: bool = ..., tryfirst: bool = ..., trylast: bool = ..., specname: str | None = ..., wrapper: bool = ..., ) -> _F: ... @overload # noqa: F811 def __call__( # noqa: F811 self, function: None = ..., hookwrapper: bool = ..., optionalhook: bool = ..., tryfirst: bool = ..., trylast: bool = ..., specname: str | None = ..., wrapper: bool = ..., ) -> Callable[[_F], _F]: ... def __call__( # noqa: F811 self, function: _F | None = None, hookwrapper: bool = False, optionalhook: bool = False, tryfirst: bool = False, trylast: bool = False, specname: str | None = None, wrapper: bool = False, ) -> _F | Callable[[_F], _F]: """If passed a function, directly sets attributes on the function which will make it discoverable to :meth:`PluginManager.register`. If passed no function, returns a decorator which can be applied to a function later using the attributes supplied. If ``optionalhook`` is ``True``, a missing matching hook specification will not result in an error (by default it is an error if no matching spec is found). If ``tryfirst`` is ``True``, this hook implementation will run as early as possible in the chain of N hook implementations for a specification. If ``trylast`` is ``True``, this hook implementation will run as late as possible in the chain of N hook implementations. If ``wrapper`` is ``True``("new-style hook wrapper"), the hook implementation needs to execute exactly one ``yield``. The code before the ``yield`` is run early before any non-hook-wrapper function is run. The code after the ``yield`` is run after all non-hook-wrapper functions have run. The ``yield`` receives the result value of the inner calls, or raises the exception of inner calls (including earlier hook wrapper calls). The return value of the function becomes the return value of the hook, and a raised exception becomes the exception of the hook. If ``hookwrapper`` is ``True`` ("old-style hook wrapper"), the hook implementation needs to execute exactly one ``yield``. The code before the ``yield`` is run early before any non-hook-wrapper function is run. The code after the ``yield`` is run after all non-hook-wrapper function have run The ``yield`` receives a :class:`_Result` object representing the exception or result outcome of the inner calls (including earlier hook wrapper calls). This option is mutually exclusive with ``wrapper``. If ``specname`` is provided, it will be used instead of the function name when matching this hook implementation to a hook specification during registration. .. versionadded:: 1.2.0 The ``wrapper`` parameter. """ def setattr_hookimpl_opts(func: _F) -> _F: opts: _HookImplOpts = { "wrapper": wrapper, "hookwrapper": hookwrapper, "optionalhook": optionalhook, "tryfirst": tryfirst, "trylast": trylast, "specname": specname, } setattr(func, self.project_name + "_impl", opts) return func if function is None: return setattr_hookimpl_opts else: return setattr_hookimpl_opts(function) def normalize_hookimpl_opts(opts: _HookImplOpts) -> None: opts.setdefault("tryfirst", False) opts.setdefault("trylast", False) opts.setdefault("wrapper", False) opts.setdefault("hookwrapper", False) opts.setdefault("optionalhook", False) opts.setdefault("specname", None) _PYPY = hasattr(sys, "pypy_version_info") def varnames(func: object) -> tuple[tuple[str, ...], tuple[str, ...]]: """Return tuple of positional and keywrord argument names for a function, method, class or callable. In case of a class, its ``__init__`` method is considered. For methods the ``self`` parameter is not included. """ if inspect.isclass(func): try: func = func.__init__ except AttributeError: return (), () elif not inspect.isroutine(func): # callable object? try: func = getattr(func, "__call__", func) except Exception: return (), () try: # func MUST be a function or method here or we won't parse any args. sig = inspect.signature( func.__func__ if inspect.ismethod(func) else func # type:ignore[arg-type] ) except TypeError: return (), () _valid_param_kinds = ( inspect.Parameter.POSITIONAL_ONLY, inspect.Parameter.POSITIONAL_OR_KEYWORD, ) _valid_params = { name: param for name, param in sig.parameters.items() if param.kind in _valid_param_kinds } args = tuple(_valid_params) defaults = ( tuple( param.default for param in _valid_params.values() if param.default is not param.empty ) or None ) if defaults: index = -len(defaults) args, kwargs = args[:index], tuple(args[index:]) else: kwargs = () # strip any implicit instance arg # pypy3 uses "obj" instead of "self" for default dunder methods if not _PYPY: implicit_names: tuple[str, ...] = ("self",) else: implicit_names = ("self", "obj") if args: qualname: str = getattr(func, "__qualname__", "") if inspect.ismethod(func) or ("." in qualname and args[0] in implicit_names): args = args[1:] return args, kwargs class _HookRelay: """Hook holder object for performing 1:N hook calls where N is the number of registered plugins.""" __slots__ = ("__dict__",) if TYPE_CHECKING: def __getattr__(self, name: str) -> _HookCaller: ... _CallHistory = List[Tuple[Mapping[str, object], Optional[Callable[[Any], None]]]] class _HookCaller: __slots__ = ( "name", "spec", "_hookexec", "_hookimpls", "_call_history", ) def __init__( self, name: str, hook_execute: _HookExec, specmodule_or_class: _Namespace | None = None, spec_opts: _HookSpecOpts | None = None, ) -> None: self.name: Final = name self._hookexec: Final = hook_execute self._hookimpls: Final[list[HookImpl]] = [] self._call_history: _CallHistory | None = None self.spec: HookSpec | None = None if specmodule_or_class is not None: assert spec_opts is not None self.set_specification(specmodule_or_class, spec_opts) def has_spec(self) -> bool: return self.spec is not None def set_specification( self, specmodule_or_class: _Namespace, spec_opts: _HookSpecOpts, ) -> None: if self.spec is not None: raise ValueError( f"Hook {self.spec.name!r} is already registered " f"within namespace {self.spec.namespace}" ) self.spec = HookSpec(specmodule_or_class, self.name, spec_opts) if spec_opts.get("historic"): self._call_history = [] def is_historic(self) -> bool: return self._call_history is not None def _remove_plugin(self, plugin: _Plugin) -> None: for i, method in enumerate(self._hookimpls): if method.plugin == plugin: del self._hookimpls[i] return raise ValueError(f"plugin {plugin!r} not found") def get_hookimpls(self) -> list[HookImpl]: return self._hookimpls.copy() def _add_hookimpl(self, hookimpl: HookImpl) -> None: """Add an implementation to the callback chain.""" for i, method in enumerate(self._hookimpls): if method.hookwrapper or method.wrapper: splitpoint = i break else: splitpoint = len(self._hookimpls) if hookimpl.hookwrapper or hookimpl.wrapper: start, end = splitpoint, len(self._hookimpls) else: start, end = 0, splitpoint if hookimpl.trylast: self._hookimpls.insert(start, hookimpl) elif hookimpl.tryfirst: self._hookimpls.insert(end, hookimpl) else: # find last non-tryfirst method i = end - 1 while i >= start and self._hookimpls[i].tryfirst: i -= 1 self._hookimpls.insert(i + 1, hookimpl) def __repr__(self) -> str: return f"<_HookCaller {self.name!r}>" def _verify_all_args_are_provided(self, kwargs: Mapping[str, object]) -> None: # This is written to avoid expensive operations when not needed. if self.spec: for argname in self.spec.argnames: if argname not in kwargs: notincall = ", ".join( repr(argname) for argname in self.spec.argnames # Avoid self.spec.argnames - kwargs.keys() - doesn't preserve order. if argname not in kwargs.keys() ) warnings.warn( "Argument(s) {} which are declared in the hookspec " "cannot be found in this hook call".format(notincall), stacklevel=2, ) break def __call__(self, **kwargs: object) -> Any: assert ( not self.is_historic() ), "Cannot directly call a historic hook - use call_historic instead." self._verify_all_args_are_provided(kwargs) firstresult = self.spec.opts.get("firstresult", False) if self.spec else False return self._hookexec(self.name, self._hookimpls, kwargs, firstresult) def call_historic( self, result_callback: Callable[[Any], None] | None = None, kwargs: Mapping[str, object] | None = None, ) -> None: """Call the hook with given ``kwargs`` for all registered plugins and for all plugins which will be registered afterwards. If ``result_callback`` is provided, it will be called for each non-``None`` result obtained from a hook implementation. """ assert self._call_history is not None kwargs = kwargs or {} self._verify_all_args_are_provided(kwargs) self._call_history.append((kwargs, result_callback)) # Historizing hooks don't return results. # Remember firstresult isn't compatible with historic. res = self._hookexec(self.name, self._hookimpls, kwargs, False) if result_callback is None: return if isinstance(res, list): for x in res: result_callback(x) def call_extra( self, methods: Sequence[Callable[..., object]], kwargs: Mapping[str, object] ) -> Any: """Call the hook with some additional temporarily participating methods using the specified ``kwargs`` as call parameters.""" assert ( not self.is_historic() ), "Cannot directly call a historic hook - use call_historic instead." self._verify_all_args_are_provided(kwargs) opts: _HookImplOpts = { "wrapper": False, "hookwrapper": False, "optionalhook": False, "trylast": False, "tryfirst": False, "specname": None, } hookimpls = self._hookimpls.copy() for method in methods: hookimpl = HookImpl(None, "<temp>", method, opts) # Find last non-tryfirst nonwrapper method. i = len(hookimpls) - 1 while ( 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]) 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}>" class HookImpl: __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: self.function: Final = function self.argnames, self.kwargnames = varnames(self.function) self.plugin = plugin self.opts = hook_impl_opts self.plugin_name = plugin_name self.wrapper = hook_impl_opts["wrapper"] self.hookwrapper = hook_impl_opts["hookwrapper"] self.optionalhook = hook_impl_opts["optionalhook"] self.tryfirst = hook_impl_opts["tryfirst"] self.trylast = hook_impl_opts["trylast"] def __repr__(self) -> str: return f"<HookImpl plugin_name={self.plugin_name!r}, plugin={self.plugin!r}>" 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")
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