mirror of
https://github.com/nonebot/nonebot2.git
synced 2024-11-28 04:56:57 +08:00
253 lines
8.3 KiB
Python
253 lines
8.3 KiB
Python
"""本模块实现插件加载流程。
|
|
|
|
参考: [import hooks](https://docs.python.org/3/reference/import.html#import-hooks), [PEP302](https://www.python.org/dev/peps/pep-0302/)
|
|
|
|
FrontMatter:
|
|
sidebar_position: 5
|
|
description: nonebot.plugin.manager 模块
|
|
"""
|
|
import sys
|
|
import pkgutil
|
|
import importlib
|
|
from pathlib import Path
|
|
from itertools import chain
|
|
from types import ModuleType
|
|
from importlib.abc import MetaPathFinder
|
|
from importlib.machinery import PathFinder, SourceFileLoader
|
|
from typing import Set, Dict, List, Union, Iterable, Optional, Sequence
|
|
|
|
from nonebot.log import logger
|
|
from nonebot.utils import escape_tag
|
|
|
|
from .plugin import Plugin, PluginMetadata
|
|
from . import (
|
|
_managers,
|
|
_new_plugin,
|
|
_revert_plugin,
|
|
_current_plugin,
|
|
_module_name_to_plugin_name,
|
|
)
|
|
|
|
|
|
class PluginManager:
|
|
"""插件管理器。
|
|
|
|
参数:
|
|
plugins: 独立插件模块名集合。
|
|
search_path: 插件搜索路径（文件夹）。
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
plugins: Optional[Iterable[str]] = None,
|
|
search_path: Optional[Iterable[str]] = None,
|
|
):
|
|
# simple plugin not in search path
|
|
self.plugins: Set[str] = set(plugins or [])
|
|
self.search_path: Set[str] = set(search_path or [])
|
|
|
|
# cache plugins
|
|
self._third_party_plugin_names: Dict[str, str] = {}
|
|
self._searched_plugin_names: Dict[str, Path] = {}
|
|
self.prepare_plugins()
|
|
|
|
@property
|
|
def third_party_plugins(self) -> Set[str]:
|
|
"""返回所有独立插件名称。"""
|
|
return set(self._third_party_plugin_names.keys())
|
|
|
|
@property
|
|
def searched_plugins(self) -> Set[str]:
|
|
"""返回已搜索到的插件名称。"""
|
|
return set(self._searched_plugin_names.keys())
|
|
|
|
@property
|
|
def available_plugins(self) -> Set[str]:
|
|
"""返回当前插件管理器中可用的插件名称。"""
|
|
return self.third_party_plugins | self.searched_plugins
|
|
|
|
def _path_to_module_name(self, path: Path) -> str:
|
|
rel_path = path.resolve().relative_to(Path(".").resolve())
|
|
if rel_path.stem == "__init__":
|
|
return ".".join(rel_path.parts[:-1])
|
|
else:
|
|
return ".".join(rel_path.parts[:-1] + (rel_path.stem,))
|
|
|
|
def _previous_plugins(self) -> Set[str]:
|
|
_pre_managers: List[PluginManager]
|
|
if self in _managers:
|
|
_pre_managers = _managers[: _managers.index(self)]
|
|
else:
|
|
_pre_managers = _managers[:]
|
|
|
|
return {
|
|
*chain.from_iterable(manager.available_plugins for manager in _pre_managers)
|
|
}
|
|
|
|
def prepare_plugins(self) -> Set[str]:
|
|
"""搜索插件并缓存插件名称。"""
|
|
|
|
# get all previous ready to load plugins
|
|
previous_plugins = self._previous_plugins()
|
|
searched_plugins: Dict[str, Path] = {}
|
|
third_party_plugins: Dict[str, str] = {}
|
|
|
|
# check third party plugins
|
|
for plugin in self.plugins:
|
|
name = _module_name_to_plugin_name(plugin)
|
|
if name in third_party_plugins or name in previous_plugins:
|
|
raise RuntimeError(
|
|
f"Plugin already exists: {name}! Check your plugin name"
|
|
)
|
|
third_party_plugins[name] = plugin
|
|
|
|
self._third_party_plugin_names = third_party_plugins
|
|
|
|
# check plugins in search path
|
|
for module_info in pkgutil.iter_modules(self.search_path):
|
|
# ignore if startswith "_"
|
|
if module_info.name.startswith("_"):
|
|
continue
|
|
|
|
if (
|
|
module_info.name in searched_plugins
|
|
or module_info.name in previous_plugins
|
|
or module_info.name in third_party_plugins
|
|
):
|
|
raise RuntimeError(
|
|
f"Plugin already exists: {module_info.name}! Check your plugin name"
|
|
)
|
|
|
|
module_spec = module_info.module_finder.find_spec(module_info.name, None)
|
|
if not module_spec:
|
|
continue
|
|
module_path = module_spec.origin
|
|
if not module_path:
|
|
continue
|
|
searched_plugins[module_info.name] = Path(module_path).resolve()
|
|
|
|
self._searched_plugin_names = searched_plugins
|
|
|
|
return self.available_plugins
|
|
|
|
def load_plugin(self, name: str) -> Optional[Plugin]:
|
|
"""加载指定插件。
|
|
|
|
对于独立插件，可以使用完整插件模块名或者插件名称。
|
|
|
|
参数:
|
|
name: 插件名称。
|
|
"""
|
|
|
|
try:
|
|
if name in self.plugins:
|
|
module = importlib.import_module(name)
|
|
elif name in self._third_party_plugin_names:
|
|
module = importlib.import_module(self._third_party_plugin_names[name])
|
|
elif name in self._searched_plugin_names:
|
|
module = importlib.import_module(
|
|
self._path_to_module_name(self._searched_plugin_names[name])
|
|
)
|
|
else:
|
|
raise RuntimeError(f"Plugin not found: {name}! Check your plugin name")
|
|
|
|
logger.opt(colors=True).success(
|
|
f'Succeeded to import "<y>{escape_tag(name)}</y>"'
|
|
)
|
|
plugin = getattr(module, "__plugin__", None)
|
|
if plugin is None:
|
|
raise RuntimeError(
|
|
f"Module {module.__name__} is not loaded as a plugin! "
|
|
"Make sure not to import it before loading."
|
|
)
|
|
return plugin
|
|
except Exception as e:
|
|
logger.opt(colors=True, exception=e).error(
|
|
f'<r><bg #f8bbd0>Failed to import "{escape_tag(name)}"</bg #f8bbd0></r>'
|
|
)
|
|
|
|
def load_all_plugins(self) -> Set[Plugin]:
|
|
"""加载所有可用插件。"""
|
|
|
|
return set(
|
|
filter(None, (self.load_plugin(name) for name in self.available_plugins))
|
|
)
|
|
|
|
|
|
class PluginFinder(MetaPathFinder):
|
|
def find_spec(
|
|
self,
|
|
fullname: str,
|
|
path: Optional[Sequence[Union[bytes, str]]],
|
|
target: Optional[ModuleType] = None,
|
|
):
|
|
if _managers:
|
|
module_spec = PathFinder.find_spec(fullname, path, target)
|
|
if not module_spec:
|
|
return
|
|
module_origin = module_spec.origin
|
|
if not module_origin:
|
|
return
|
|
module_path = Path(module_origin).resolve()
|
|
|
|
for manager in reversed(_managers):
|
|
# use path instead of name in case of submodule name conflict
|
|
if (
|
|
fullname in manager.plugins
|
|
or module_path in manager._searched_plugin_names.values()
|
|
):
|
|
module_spec.loader = PluginLoader(manager, fullname, module_origin)
|
|
return module_spec
|
|
return
|
|
|
|
|
|
class PluginLoader(SourceFileLoader):
|
|
def __init__(self, manager: PluginManager, fullname: str, path) -> None:
|
|
self.manager = manager
|
|
self.loaded = False
|
|
super().__init__(fullname, path)
|
|
|
|
def create_module(self, spec) -> Optional[ModuleType]:
|
|
if self.name in sys.modules:
|
|
self.loaded = True
|
|
return sys.modules[self.name]
|
|
# return None to use default module creation
|
|
return super().create_module(spec)
|
|
|
|
def exec_module(self, module: ModuleType) -> None:
|
|
if self.loaded:
|
|
return
|
|
|
|
# create plugin before executing
|
|
plugin = _new_plugin(self.name, module, self.manager)
|
|
setattr(module, "__plugin__", plugin)
|
|
|
|
# detect parent plugin before entering current plugin context
|
|
parent_plugin = _current_plugin.get()
|
|
if parent_plugin and _managers.index(parent_plugin.manager) < _managers.index(
|
|
self.manager
|
|
):
|
|
plugin.parent_plugin = parent_plugin
|
|
parent_plugin.sub_plugins.add(plugin)
|
|
|
|
# enter plugin context
|
|
_plugin_token = _current_plugin.set(plugin)
|
|
|
|
try:
|
|
super().exec_module(module)
|
|
except Exception:
|
|
_revert_plugin(plugin)
|
|
raise
|
|
finally:
|
|
# leave plugin context
|
|
_current_plugin.reset(_plugin_token)
|
|
|
|
# get plugin metadata
|
|
metadata: Optional[PluginMetadata] = getattr(module, "__plugin_meta__", None)
|
|
plugin.metadata = metadata
|
|
|
|
return
|
|
|
|
|
|
sys.meta_path.insert(0, PluginFinder())
|