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# Copyright (C) 2009-2017 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""Plugin utilities."""
from lazr.config import as_boolean
from mailman.config import config
from mailman.utilities.modules import find_components
from pkg_resources import resource_isdir
from public import public
@public
def find_pluggable_components(subpackage, interface):
"""Find components which conform to a given interface, in subpackage.
:param subpackage: Mailman subpackage to search. The search is also
done inside the corresponding plugins subpackages.
:type subpackage: string
:param interface: The interface that returned objects must conform to.
:type interface: `Interface`
:return: The sequence of matching components.
:rtype: objects implementing `interface`
"""
yield from find_components('mailman.' + subpackage, interface)
package_roots = [plugin.path
for name, plugin in config.plugin_configs
if as_boolean(plugin.enable) and plugin.path]
for package_root in package_roots:
package = package_root + '.' + subpackage
if resource_isdir(package_root, subpackage):
yield from find_components(package, interface)
@public
def add_pluggable_components(subpackage, interface, mapping):
"""Add components to a given mapping.
Similarly to `find_pluggable_components()` this inspects all modules in a
given mailman and plugin's subpackage looking for objects that conform to
a given interface. All such found objects (unless decorated with
`@abstract_component`) are added to the given mapping, keyed by the
object's `.name` attribute, which is required. It is a fatal error if
that key already exists in the mapping.
:param package: The subpackage path to search.
:type package: string
:param interface: The interface that returned objects must conform to.
Objects found must have a `.name` attribute containing a unique
string.
:type interface: `Interface`
:param mapping: The mapping to add the found components to.
:type mapping: A dict-like mapping. This only needs to support
containment tests (e.g. `in` and `not in`) and `__setitem__()`.
:raises RuntimeError: when a duplicate key is found.
"""
for component in find_pluggable_components(subpackage, interface):
if component.name in mapping:
raise RuntimeError(
'Duplicate key "{}" found in {}; previously {}'.format(
component.name, component, mapping[component.name]))
mapping[component.name] = component
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