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# Copyright 2015-2016 Canonical Ltd.
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# This file is part of the Leadership Layer for Juju.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3, as
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# published by the Free Software Foundation.
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranties of
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# MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
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# PURPOSE. See the GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from charmhelpers.core import hookenv
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from charmhelpers.core import unitdata
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from charms import reactive
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from charms.reactive import not_unless
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__all__ = ['leader_get', 'leader_set']
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@not_unless('leadership.is_leader')
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def leader_set(settings=None, **kw):
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'''Change leadership settings, per charmhelpers.core.hookenv.leader_set.
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The leadership.set.{key} reactive state will be set while the
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leadership hook environment setting remains set.
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Changed leadership settings will set the leadership.changed.{key}
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and leadership.changed states. These states will remain set until
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These state changes take effect immediately on the leader, and
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in future hooks run on non-leaders. In this way both leaders and
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non-leaders can share handlers, waiting on these states.
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settings = settings or {}
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previous = unitdata.kv().getrange('leadership.settings.', strip=True)
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for key, value in settings.items():
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if value != previous.get(key):
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reactive.set_state('leadership.changed.{}'.format(key))
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reactive.set_state('leadership.changed')
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reactive.helpers.toggle_state('leadership.set.{}'.format(key),
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hookenv.leader_set(settings)
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unitdata.kv().update(settings, prefix='leadership.settings.')
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def leader_get(attribute=None):
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'''Return leadership settings, per charmhelpers.core.hookenv.leader_get.'''
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return hookenv.leader_get(attribute)
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lib/charms/leadership.py
