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85 lines
3.5 KiB
Python
85 lines
3.5 KiB
Python
5 years ago
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import logging
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from .extension import ExtensionManager
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LOG = logging.getLogger(__name__)
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class EnabledExtensionManager(ExtensionManager):
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"""Loads only plugins that pass a check function.
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The check_func argument should return a boolean, with ``True``
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indicating that the extension should be loaded and made available
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and ``False`` indicating that the extension should be ignored.
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:param namespace: The namespace for the entry points.
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:type namespace: str
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:param check_func: Function to determine which extensions to load.
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:type check_func: callable, taking an :class:`Extension`
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instance as argument
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:param invoke_on_load: Boolean controlling whether to invoke the
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object returned by the entry point after the driver is loaded.
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:type invoke_on_load: bool
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:param invoke_args: Positional arguments to pass when invoking
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the object returned by the entry point. Only used if invoke_on_load
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is True.
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:type invoke_args: tuple
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:param invoke_kwds: Named arguments to pass when invoking
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the object returned by the entry point. Only used if invoke_on_load
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is True.
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:type invoke_kwds: dict
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:param propagate_map_exceptions: Boolean controlling whether exceptions
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are propagated up through the map call or whether they are logged and
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then ignored
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:type propagate_map_exceptions: bool
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:param on_load_failure_callback: Callback function that will be called when
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a entrypoint can not be loaded. The arguments that will be provided
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when this is called (when an entrypoint fails to load) are
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(manager, entrypoint, exception)
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:type on_load_failure_callback: function
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:param verify_requirements: Use setuptools to enforce the
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dependencies of the plugin(s) being loaded. Defaults to False.
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:type verify_requirements: bool
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"""
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def __init__(self, namespace, check_func, invoke_on_load=False,
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invoke_args=(), invoke_kwds={},
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propagate_map_exceptions=False,
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on_load_failure_callback=None,
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verify_requirements=False,):
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self.check_func = check_func
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super(EnabledExtensionManager, self).__init__(
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namespace,
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invoke_on_load=invoke_on_load,
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invoke_args=invoke_args,
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invoke_kwds=invoke_kwds,
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propagate_map_exceptions=propagate_map_exceptions,
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on_load_failure_callback=on_load_failure_callback,
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verify_requirements=verify_requirements,
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)
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def _load_one_plugin(self, ep, invoke_on_load, invoke_args, invoke_kwds,
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verify_requirements):
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ext = super(EnabledExtensionManager, self)._load_one_plugin(
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ep, invoke_on_load, invoke_args, invoke_kwds,
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verify_requirements,
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)
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if ext and not self.check_func(ext):
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LOG.debug('ignoring extension %r', ep.name)
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return None
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return ext
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