forked from bton/matekasse
467 lines
18 KiB
Python
467 lines
18 KiB
Python
|
from __future__ import annotations
|
||
|
|
|
||
|
|
import inspect
|
||
|
|
import sys
|
||
|
|
import types
|
||
|
|
import warnings
|
||
|
|
from typing import Any
|
||
|
|
from typing import Callable
|
||
|
|
from typing import cast
|
||
|
|
from typing import Iterable
|
||
|
|
from typing import Mapping
|
||
|
|
from typing import Sequence
|
||
|
|
from typing import TYPE_CHECKING
|
||
|
|
|
||
|
|
from . import _tracing
|
||
|
|
from ._callers import _multicall
|
||
|
|
from ._hooks import _HookCaller
|
||
|
|
from ._hooks import _HookImplFunction
|
||
|
|
from ._hooks import _HookRelay
|
||
|
|
from ._hooks import _Namespace
|
||
|
|
from ._hooks import _Plugin
|
||
|
|
from ._hooks import _SubsetHookCaller
|
||
|
|
from ._hooks import HookImpl
|
||
|
|
from ._hooks import HookSpec
|
||
|
|
from ._hooks import normalize_hookimpl_opts
|
||
|
|
from ._result import _Result
|
||
|
|
|
||
|
|
if sys.version_info >= (3, 8):
|
||
|
|
from importlib import metadata as importlib_metadata
|
||
|
|
else:
|
||
|
|
import importlib_metadata
|
||
|
|
|
||
|
|
if TYPE_CHECKING:
|
||
|
|
from typing_extensions import Final
|
||
|
|
|
||
|
|
from ._hooks import _HookImplOpts, _HookSpecOpts
|
||
|
|
|
||
|
|
_BeforeTrace = Callable[[str, Sequence[HookImpl], Mapping[str, Any]], None]
|
||
|
|
_AfterTrace = Callable[[_Result[Any], str, Sequence[HookImpl], Mapping[str, Any]], None]
|
||
|
|
|
||
|
|
|
||
|
|
def _warn_for_function(warning: Warning, function: Callable[..., object]) -> None:
|
||
|
|
func = cast(types.FunctionType, function)
|
||
|
|
warnings.warn_explicit(
|
||
|
|
warning,
|
||
|
|
type(warning),
|
||
|
|
lineno=func.__code__.co_firstlineno,
|
||
|
|
filename=func.__code__.co_filename,
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
class PluginValidationError(Exception):
|
||
|
|
"""Plugin failed validation.
|
||
|
|
|
||
|
|
:param plugin: The plugin which failed validation.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, plugin: _Plugin, message: str) -> None:
|
||
|
|
super().__init__(message)
|
||
|
|
self.plugin = plugin
|
||
|
|
|
||
|
|
|
||
|
|
class DistFacade:
|
||
|
|
"""Emulate a pkg_resources Distribution"""
|
||
|
|
|
||
|
|
def __init__(self, dist: importlib_metadata.Distribution) -> None:
|
||
|
|
self._dist = dist
|
||
|
|
|
||
|
|
@property
|
||
|
|
def project_name(self) -> str:
|
||
|
|
name: str = self.metadata["name"]
|
||
|
|
return name
|
||
|
|
|
||
|
|
def __getattr__(self, attr: str, default=None):
|
||
|
|
return getattr(self._dist, attr, default)
|
||
|
|
|
||
|
|
def __dir__(self) -> list[str]:
|
||
|
|
return sorted(dir(self._dist) + ["_dist", "project_name"])
|
||
|
|
|
||
|
|
|
||
|
|
class PluginManager:
|
||
|
|
"""Core class which manages registration of plugin objects and 1:N hook
|
||
|
|
calling.
|
||
|
|
|
||
|
|
You can register new hooks by calling :meth:`add_hookspecs(module_or_class)
|
||
|
|
<PluginManager.add_hookspecs>`.
|
||
|
|
|
||
|
|
You can register plugin objects (which contain hook implementations) by
|
||
|
|
calling :meth:`register(plugin) <PluginManager.register>`.
|
||
|
|
|
||
|
|
For debugging purposes you can call :meth:`PluginManager.enable_tracing`
|
||
|
|
which will subsequently send debug information to the trace helper.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, project_name: str) -> None:
|
||
|
|
self.project_name: Final = project_name
|
||
|
|
self._name2plugin: Final[dict[str, _Plugin]] = {}
|
||
|
|
self._plugin_distinfo: Final[list[tuple[_Plugin, DistFacade]]] = []
|
||
|
|
self.trace: Final = _tracing.TagTracer().get("pluginmanage")
|
||
|
|
self.hook: Final = _HookRelay()
|
||
|
|
self._inner_hookexec = _multicall
|
||
|
|
|
||
|
|
def _hookexec(
|
||
|
|
self,
|
||
|
|
hook_name: str,
|
||
|
|
methods: Sequence[HookImpl],
|
||
|
|
kwargs: Mapping[str, object],
|
||
|
|
firstresult: bool,
|
||
|
|
) -> object | list[object]:
|
||
|
|
# called from all hookcaller instances.
|
||
|
|
# enable_tracing will set its own wrapping function at self._inner_hookexec
|
||
|
|
return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
|
||
|
|
|
||
|
|
def register(self, plugin: _Plugin, name: str | None = None) -> str | None:
|
||
|
|
"""Register a plugin and return its name.
|
||
|
|
|
||
|
|
If a name is not specified, a name is generated using
|
||
|
|
:func:`get_canonical_name`.
|
||
|
|
|
||
|
|
If the name is blocked from registering, returns ``None``.
|
||
|
|
|
||
|
|
If the plugin is already registered, raises a :class:`ValueError`.
|
||
|
|
"""
|
||
|
|
plugin_name = name or self.get_canonical_name(plugin)
|
||
|
|
|
||
|
|
if plugin_name in self._name2plugin:
|
||
|
|
if self._name2plugin.get(plugin_name, -1) is None:
|
||
|
|
return None # blocked plugin, return None to indicate no registration
|
||
|
|
raise ValueError(
|
||
|
|
"Plugin name already registered: %s=%s\n%s"
|
||
|
|
% (plugin_name, plugin, self._name2plugin)
|
||
|
|
)
|
||
|
|
|
||
|
|
if plugin in self._name2plugin.values():
|
||
|
|
raise ValueError(
|
||
|
|
"Plugin already registered under a different name: %s=%s\n%s"
|
||
|
|
% (plugin_name, plugin, self._name2plugin)
|
||
|
|
)
|
||
|
|
|
||
|
|
# XXX if an error happens we should make sure no state has been
|
||
|
|
# changed at point of return
|
||
|
|
self._name2plugin[plugin_name] = plugin
|
||
|
|
|
||
|
|
# register matching hook implementations of the plugin
|
||
|
|
for name in dir(plugin):
|
||
|
|
hookimpl_opts = self.parse_hookimpl_opts(plugin, name)
|
||
|
|
if hookimpl_opts is not None:
|
||
|
|
normalize_hookimpl_opts(hookimpl_opts)
|
||
|
|
method: _HookImplFunction[object] = getattr(plugin, name)
|
||
|
|
hookimpl = HookImpl(plugin, plugin_name, method, hookimpl_opts)
|
||
|
|
name = hookimpl_opts.get("specname") or name
|
||
|
|
hook: _HookCaller | None = getattr(self.hook, name, None)
|
||
|
|
if hook is None:
|
||
|
|
hook = _HookCaller(name, self._hookexec)
|
||
|
|
setattr(self.hook, name, hook)
|
||
|
|
elif hook.has_spec():
|
||
|
|
self._verify_hook(hook, hookimpl)
|
||
|
|
hook._maybe_apply_history(hookimpl)
|
||
|
|
hook._add_hookimpl(hookimpl)
|
||
|
|
return plugin_name
|
||
|
|
|
||
|
|
def parse_hookimpl_opts(self, plugin: _Plugin, name: str) -> _HookImplOpts | None:
|
||
|
|
method: object = getattr(plugin, name)
|
||
|
|
if not inspect.isroutine(method):
|
||
|
|
return None
|
||
|
|
try:
|
||
|
|
res: _HookImplOpts | None = getattr(
|
||
|
|
method, self.project_name + "_impl", None
|
||
|
|
)
|
||
|
|
except Exception:
|
||
|
|
res = {} # type: ignore[assignment]
|
||
|
|
if res is not None and not isinstance(res, dict):
|
||
|
|
# false positive
|
||
|
|
res = None # type:ignore[unreachable]
|
||
|
|
return res
|
||
|
|
|
||
|
|
def unregister(
|
||
|
|
self, plugin: _Plugin | None = None, name: str | None = None
|
||
|
|
) -> _Plugin:
|
||
|
|
"""Unregister a plugin and all of its hook implementations.
|
||
|
|
|
||
|
|
The plugin can be specified either by the plugin object or the plugin
|
||
|
|
name. If both are specified, they must agree.
|
||
|
|
"""
|
||
|
|
if name is None:
|
||
|
|
assert plugin is not None, "one of name or plugin needs to be specified"
|
||
|
|
name = self.get_name(plugin)
|
||
|
|
assert name is not None, "plugin is not registered"
|
||
|
|
|
||
|
|
if plugin is None:
|
||
|
|
plugin = self.get_plugin(name)
|
||
|
|
|
||
|
|
hookcallers = self.get_hookcallers(plugin)
|
||
|
|
if hookcallers:
|
||
|
|
for hookcaller in hookcallers:
|
||
|
|
hookcaller._remove_plugin(plugin)
|
||
|
|
|
||
|
|
# if self._name2plugin[name] == None registration was blocked: ignore
|
||
|
|
if self._name2plugin.get(name):
|
||
|
|
assert name is not None
|
||
|
|
del self._name2plugin[name]
|
||
|
|
|
||
|
|
return plugin
|
||
|
|
|
||
|
|
def set_blocked(self, name: str) -> None:
|
||
|
|
"""Block registrations of the given name, unregister if already registered."""
|
||
|
|
self.unregister(name=name)
|
||
|
|
self._name2plugin[name] = None
|
||
|
|
|
||
|
|
def is_blocked(self, name: str) -> bool:
|
||
|
|
"""Return whether the given plugin name is blocked."""
|
||
|
|
return name in self._name2plugin and self._name2plugin[name] is None
|
||
|
|
|
||
|
|
def add_hookspecs(self, module_or_class: _Namespace) -> None:
|
||
|
|
"""Add new hook specifications defined in the given ``module_or_class``.
|
||
|
|
|
||
|
|
Functions are recognized as hook specifications if they have been
|
||
|
|
decorated with a matching :class:`HookspecMarker`.
|
||
|
|
"""
|
||
|
|
names = []
|
||
|
|
for name in dir(module_or_class):
|
||
|
|
spec_opts = self.parse_hookspec_opts(module_or_class, name)
|
||
|
|
if spec_opts is not None:
|
||
|
|
hc: _HookCaller | None = getattr(self.hook, name, None)
|
||
|
|
if hc is None:
|
||
|
|
hc = _HookCaller(name, self._hookexec, module_or_class, spec_opts)
|
||
|
|
setattr(self.hook, name, hc)
|
||
|
|
else:
|
||
|
|
# Plugins registered this hook without knowing the spec.
|
||
|
|
hc.set_specification(module_or_class, spec_opts)
|
||
|
|
for hookfunction in hc.get_hookimpls():
|
||
|
|
self._verify_hook(hc, hookfunction)
|
||
|
|
names.append(name)
|
||
|
|
|
||
|
|
if not names:
|
||
|
|
raise ValueError(
|
||
|
|
f"did not find any {self.project_name!r} hooks in {module_or_class!r}"
|
||
|
|
)
|
||
|
|
|
||
|
|
def parse_hookspec_opts(
|
||
|
|
self, module_or_class: _Namespace, name: str
|
||
|
|
) -> _HookSpecOpts | None:
|
||
|
|
method: HookSpec = getattr(module_or_class, name)
|
||
|
|
opts: _HookSpecOpts | None = getattr(method, self.project_name + "_spec", None)
|
||
|
|
return opts
|
||
|
|
|
||
|
|
def get_plugins(self) -> set[Any]:
|
||
|
|
"""Return a set of all registered plugin objects."""
|
||
|
|
return set(self._name2plugin.values())
|
||
|
|
|
||
|
|
def is_registered(self, plugin: _Plugin) -> bool:
|
||
|
|
"""Return whether the plugin is already registered."""
|
||
|
|
return any(plugin == val for val in self._name2plugin.values())
|
||
|
|
|
||
|
|
def get_canonical_name(self, plugin: _Plugin) -> str:
|
||
|
|
"""Return a canonical name for a plugin object.
|
||
|
|
|
||
|
|
Note that a plugin may be registered under a different name
|
||
|
|
specified by the caller of :meth:`register(plugin, name) <register>`.
|
||
|
|
To obtain the name of n registered plugin use :meth:`get_name(plugin)
|
||
|
|
<get_name>` instead.
|
||
|
|
"""
|
||
|
|
name: str | None = getattr(plugin, "__name__", None)
|
||
|
|
return name or str(id(plugin))
|
||
|
|
|
||
|
|
def get_plugin(self, name: str) -> Any | None:
|
||
|
|
"""Return the plugin registered under the given name, if any."""
|
||
|
|
return self._name2plugin.get(name)
|
||
|
|
|
||
|
|
def has_plugin(self, name: str) -> bool:
|
||
|
|
"""Return whether a plugin with the given name is registered."""
|
||
|
|
return self.get_plugin(name) is not None
|
||
|
|
|
||
|
|
def get_name(self, plugin: _Plugin) -> str | None:
|
||
|
|
"""Return the name the plugin is registered under, or ``None`` if
|
||
|
|
is isn't."""
|
||
|
|
for name, val in self._name2plugin.items():
|
||
|
|
if plugin == val:
|
||
|
|
return name
|
||
|
|
return None
|
||
|
|
|
||
|
|
def _verify_hook(self, hook: _HookCaller, hookimpl: HookImpl) -> None:
|
||
|
|
if hook.is_historic() and (hookimpl.hookwrapper or hookimpl.wrapper):
|
||
|
|
raise PluginValidationError(
|
||
|
|
hookimpl.plugin,
|
||
|
|
"Plugin %r\nhook %r\nhistoric incompatible with yield/wrapper/hookwrapper"
|
||
|
|
% (hookimpl.plugin_name, hook.name),
|
||
|
|
)
|
||
|
|
|
||
|
|
assert hook.spec is not None
|
||
|
|
if hook.spec.warn_on_impl:
|
||
|
|
_warn_for_function(hook.spec.warn_on_impl, hookimpl.function)
|
||
|
|
|
||
|
|
# positional arg checking
|
||
|
|
notinspec = set(hookimpl.argnames) - set(hook.spec.argnames)
|
||
|
|
if notinspec:
|
||
|
|
raise PluginValidationError(
|
||
|
|
hookimpl.plugin,
|
||
|
|
"Plugin %r for hook %r\nhookimpl definition: %s\n"
|
||
|
|
"Argument(s) %s are declared in the hookimpl but "
|
||
|
|
"can not be found in the hookspec"
|
||
|
|
% (
|
||
|
|
hookimpl.plugin_name,
|
||
|
|
hook.name,
|
||
|
|
_formatdef(hookimpl.function),
|
||
|
|
notinspec,
|
||
|
|
),
|
||
|
|
)
|
||
|
|
|
||
|
|
if (
|
||
|
|
hookimpl.wrapper or hookimpl.hookwrapper
|
||
|
|
) and not inspect.isgeneratorfunction(hookimpl.function):
|
||
|
|
raise PluginValidationError(
|
||
|
|
hookimpl.plugin,
|
||
|
|
"Plugin %r for hook %r\nhookimpl definition: %s\n"
|
||
|
|
"Declared as wrapper=True or hookwrapper=True "
|
||
|
|
"but function is not a generator function"
|
||
|
|
% (hookimpl.plugin_name, hook.name, _formatdef(hookimpl.function)),
|
||
|
|
)
|
||
|
|
|
||
|
|
if hookimpl.wrapper and hookimpl.hookwrapper:
|
||
|
|
raise PluginValidationError(
|
||
|
|
hookimpl.plugin,
|
||
|
|
"Plugin %r for hook %r\nhookimpl definition: %s\n"
|
||
|
|
"The wrapper=True and hookwrapper=True options are mutually exclusive"
|
||
|
|
% (hookimpl.plugin_name, hook.name, _formatdef(hookimpl.function)),
|
||
|
|
)
|
||
|
|
|
||
|
|
def check_pending(self) -> None:
|
||
|
|
"""Verify that all hooks which have not been verified against a
|
||
|
|
hook specification are optional, otherwise raise
|
||
|
|
:class:`PluginValidationError`."""
|
||
|
|
for name in self.hook.__dict__:
|
||
|
|
if name[0] != "_":
|
||
|
|
hook: _HookCaller = getattr(self.hook, name)
|
||
|
|
if not hook.has_spec():
|
||
|
|
for hookimpl in hook.get_hookimpls():
|
||
|
|
if not hookimpl.optionalhook:
|
||
|
|
raise PluginValidationError(
|
||
|
|
hookimpl.plugin,
|
||
|
|
"unknown hook %r in plugin %r"
|
||
|
|
% (name, hookimpl.plugin),
|
||
|
|
)
|
||
|
|
|
||
|
|
def load_setuptools_entrypoints(self, group: str, name: str | None = None) -> int:
|
||
|
|
"""Load modules from querying the specified setuptools ``group``.
|
||
|
|
|
||
|
|
:param str group: Entry point group to load plugins.
|
||
|
|
:param str name: If given, loads only plugins with the given ``name``.
|
||
|
|
:rtype: int
|
||
|
|
:return: The number of plugins loaded by this call.
|
||
|
|
"""
|
||
|
|
count = 0
|
||
|
|
for dist in list(importlib_metadata.distributions()):
|
||
|
|
for ep in dist.entry_points:
|
||
|
|
if (
|
||
|
|
ep.group != group
|
||
|
|
or (name is not None and ep.name != name)
|
||
|
|
# already registered
|
||
|
|
or self.get_plugin(ep.name)
|
||
|
|
or self.is_blocked(ep.name)
|
||
|
|
):
|
||
|
|
continue
|
||
|
|
plugin = ep.load()
|
||
|
|
self.register(plugin, name=ep.name)
|
||
|
|
self._plugin_distinfo.append((plugin, DistFacade(dist)))
|
||
|
|
count += 1
|
||
|
|
return count
|
||
|
|
|
||
|
|
def list_plugin_distinfo(self) -> list[tuple[_Plugin, DistFacade]]:
|
||
|
|
"""Return a list of (plugin, distinfo) pairs for all
|
||
|
|
setuptools-registered plugins."""
|
||
|
|
return list(self._plugin_distinfo)
|
||
|
|
|
||
|
|
def list_name_plugin(self) -> list[tuple[str, _Plugin]]:
|
||
|
|
"""Return a list of (name, plugin) pairs for all registered plugins."""
|
||
|
|
return list(self._name2plugin.items())
|
||
|
|
|
||
|
|
def get_hookcallers(self, plugin: _Plugin) -> list[_HookCaller] | None:
|
||
|
|
"""Get all hook callers for the specified plugin."""
|
||
|
|
if self.get_name(plugin) is None:
|
||
|
|
return None
|
||
|
|
hookcallers = []
|
||
|
|
for hookcaller in self.hook.__dict__.values():
|
||
|
|
for hookimpl in hookcaller.get_hookimpls():
|
||
|
|
if hookimpl.plugin is plugin:
|
||
|
|
hookcallers.append(hookcaller)
|
||
|
|
return hookcallers
|
||
|
|
|
||
|
|
def add_hookcall_monitoring(
|
||
|
|
self, before: _BeforeTrace, after: _AfterTrace
|
||
|
|
) -> Callable[[], None]:
|
||
|
|
"""Add before/after tracing functions for all hooks.
|
||
|
|
|
||
|
|
Returns an undo function which, when called, removes the added tracers.
|
||
|
|
|
||
|
|
``before(hook_name, hook_impls, kwargs)`` will be called ahead
|
||
|
|
of all hook calls and receive a hookcaller instance, a list
|
||
|
|
of HookImpl instances and the keyword arguments for the hook call.
|
||
|
|
|
||
|
|
``after(outcome, hook_name, hook_impls, kwargs)`` receives the
|
||
|
|
same arguments as ``before`` but also a :class:`_Result` object
|
||
|
|
which represents the result of the overall hook call.
|
||
|
|
"""
|
||
|
|
oldcall = self._inner_hookexec
|
||
|
|
|
||
|
|
def traced_hookexec(
|
||
|
|
hook_name: str,
|
||
|
|
hook_impls: Sequence[HookImpl],
|
||
|
|
caller_kwargs: Mapping[str, object],
|
||
|
|
firstresult: bool,
|
||
|
|
) -> object | list[object]:
|
||
|
|
before(hook_name, hook_impls, caller_kwargs)
|
||
|
|
outcome = _Result.from_call(
|
||
|
|
lambda: oldcall(hook_name, hook_impls, caller_kwargs, firstresult)
|
||
|
|
)
|
||
|
|
after(outcome, hook_name, hook_impls, caller_kwargs)
|
||
|
|
return outcome.get_result()
|
||
|
|
|
||
|
|
self._inner_hookexec = traced_hookexec
|
||
|
|
|
||
|
|
def undo() -> None:
|
||
|
|
self._inner_hookexec = oldcall
|
||
|
|
|
||
|
|
return undo
|
||
|
|
|
||
|
|
def enable_tracing(self) -> Callable[[], None]:
|
||
|
|
"""Enable tracing of hook calls.
|
||
|
|
|
||
|
|
Returns an undo function which, when called, removes the added tracing.
|
||
|
|
"""
|
||
|
|
hooktrace = self.trace.root.get("hook")
|
||
|
|
|
||
|
|
def before(
|
||
|
|
hook_name: str, methods: Sequence[HookImpl], kwargs: Mapping[str, object]
|
||
|
|
) -> None:
|
||
|
|
hooktrace.root.indent += 1
|
||
|
|
hooktrace(hook_name, kwargs)
|
||
|
|
|
||
|
|
def after(
|
||
|
|
outcome: _Result[object],
|
||
|
|
hook_name: str,
|
||
|
|
methods: Sequence[HookImpl],
|
||
|
|
kwargs: Mapping[str, object],
|
||
|
|
) -> None:
|
||
|
|
if outcome.exception is None:
|
||
|
|
hooktrace("finish", hook_name, "-->", outcome.get_result())
|
||
|
|
hooktrace.root.indent -= 1
|
||
|
|
|
||
|
|
return self.add_hookcall_monitoring(before, after)
|
||
|
|
|
||
|
|
def subset_hook_caller(
|
||
|
|
self, name: str, remove_plugins: Iterable[_Plugin]
|
||
|
|
) -> _HookCaller:
|
||
|
|
"""Return a proxy :py:class:`._hooks._HookCaller` instance for the named
|
||
|
|
method which manages calls to all registered plugins except the ones
|
||
|
|
from remove_plugins."""
|
||
|
|
orig: _HookCaller = getattr(self.hook, name)
|
||
|
|
plugins_to_remove = {plug for plug in remove_plugins if hasattr(plug, name)}
|
||
|
|
if plugins_to_remove:
|
||
|
|
return _SubsetHookCaller(orig, plugins_to_remove)
|
||
|
|
return orig
|
||
|
|
|
||
|
|
|
||
|
|
def _formatdef(func: Callable[..., object]) -> str:
|
||
|
|
return f"{func.__name__}{inspect.signature(func)}"
|