71 lines
2.7 KiB
Python
71 lines
2.7 KiB
Python
#!/usr/bin/python
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from charms.reactive import RelationBase
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from charms.reactive import hook
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from charms.reactive import scopes
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class EtcdPeer(RelationBase):
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'''This class handles peer relation communication by setting states that
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the reactive code can respond to. '''
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scope = scopes.UNIT
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@hook('{peers:etcd}-relation-joined')
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def peer_joined(self):
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'''A new peer has joined, set the state on the unit so we can track
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when they are departed. '''
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conv = self.conversation()
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conv.set_state('{relation_name}.joined')
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@hook('{peers:etcd}-relation-departed')
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def peers_going_away(self):
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'''Trigger a state on the unit that it is leaving. We can use this
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state in conjunction with the joined state to determine which unit to
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unregister from the etcd cluster. '''
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conv = self.conversation()
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conv.remove_state('{relation_name}.joined')
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conv.set_state('{relation_name}.departing')
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def dismiss(self):
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'''Remove the departing state from all other units in the conversation,
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and we can resume normal operation.
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'''
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for conv in self.conversations():
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conv.remove_state('{relation_name}.departing')
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def get_peers(self):
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'''Return a list of names for the peers participating in this
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conversation scope. '''
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peers = []
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# Iterate over all the conversations of this type.
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for conversation in self.conversations():
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peers.append(conversation.scope)
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return peers
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def set_db_ingress_address(self, address):
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'''Set the ingress address belonging to the db relation.'''
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for conversation in self.conversations():
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conversation.set_remote('db-ingress-address', address)
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def get_db_ingress_addresses(self):
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'''Return a list of db ingress addresses'''
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addresses = []
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# Iterate over all the conversations of this type.
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for conversation in self.conversations():
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address = conversation.get_remote('db-ingress-address')
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if address:
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addresses.append(address)
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return addresses
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