~corey.bryant/+junk/charm-composing

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#!/usr/bin/python

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

# http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

from charms.reactive import RelationBase

from charms.reactive import scopes

from charms.reactive import hook

from charms.reactive import not_unless

class RabbitMQ(RelationBase):

# We expect multiple, separate services to be related, but all units of a

# given service will share the same database name and connection info.

# Thus, we use SERVICE scope and will have one converstaion per service.

scope = scopes.SERVICE

@hook('amqp-relation-joined')

def joined(self):

conversation = self.conversation()

conversation.set_state('{relation_name}.amqp.requested')

@hook('amqp-relation-{broken,departed}')

def departed(self):

conversation = self.conversation()

# if these were requested but not yet fulfilled, cancel the request

conversation.remove_state('{relation_name}.amqp.requested')