58 lines
2.0 KiB
Python
58 lines
2.0 KiB
Python
# This file is part of Radicale - CalDAV and CardDAV server
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# Copyright © 2014 Jean-Marc Martins
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# Copyright © 2012-2017 Guillaume Ayoub
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# Copyright © 2017-2018 Unrud <unrud@outlook.com>
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Radicale. If not, see <http://www.gnu.org/licenses/>.
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import sys
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from importlib import import_module
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from typing import Callable, Sequence, Type, TypeVar, Union
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from radicale import config
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from radicale.log import logger
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if sys.version_info < (3, 8):
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import pkg_resources
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else:
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from importlib import metadata
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_T_co = TypeVar("_T_co", covariant=True)
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def load_plugin(internal_types: Sequence[str], module_name: str,
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class_name: str, base_class: Type[_T_co],
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configuration: "config.Configuration") -> _T_co:
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type_: Union[str, Callable] = configuration.get(module_name, "type")
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if callable(type_):
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logger.info("%s type is %r", module_name, type_)
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return type_(configuration)
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if type_ in internal_types:
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module = "radicale.%s.%s" % (module_name, type_)
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else:
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module = type_
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try:
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class_ = getattr(import_module(module), class_name)
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except Exception as e:
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raise RuntimeError("Failed to load %s module %r: %s" %
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(module_name, module, e)) from e
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logger.info("%s type is %r", module_name, module)
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return class_(configuration)
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def package_version(name):
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if sys.version_info < (3, 8):
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return pkg_resources.get_distribution(name).version
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return metadata.version(name)
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