def relation_factory(relation_name):
"""Get the RelationFactory for the given relation name.
Looks for a RelationFactory in the first file matching:
``$CHARM_DIR/hooks/relations/{interface}/{provides,requires,peer}.py``
"""
role, interface = hookenv.relation_to_role_and_interface(relation_name)
if not (role and interface):
hookenv.log('Unable to determine role and interface for relation '
'{}'.format(relation_name), hookenv.ERROR)
return None
return _find_relation_factory(_relation_module(role, interface))
def from_name(cls, relation_name, conversations=None):
"""
Find relation implementation in the current charm, based on the
name of the relation.
:return: A Relation instance, or None
"""
if relation_name is None:
return None
relation_class = cls._cache.get(relation_name)
if relation_class:
return relation_class(relation_name, conversations)
role, interface = hookenv.relation_to_role_and_interface(relation_name)
if role and interface:
relation_class = cls._find_impl(role, interface)
if relation_class:
cls._cache[relation_name] = relation_class
return relation_class(relation_name, conversations)
return None
def from_name(cls, relation_name, conversations=None):
"""
Find relation implementation in the current charm, based on the
name of the relation.
:return: A Relation instance, or None
"""
if relation_name is None:
return None
relation_class = cls._cache.get(relation_name)
if relation_class:
return relation_class(relation_name, conversations)
role, interface = hookenv.relation_to_role_and_interface(relation_name)
if role and interface:
relation_class = cls._find_impl(role, interface)
if relation_class:
cls._cache[relation_name] = relation_class
return relation_class(relation_name, conversations)
return None
#!/usr/bin/env python3
import json
import os
import sys
from subprocess import check_call
sys.path.append('lib')
from charmhelpers.core import hookenv, unitdata
if __name__ == '__main__':
relname = hookenv.relation_type()
role, _ = hookenv.relation_to_role_and_interface(relname)
local_data = hookenv.relation_get()
env = {}
env.update(os.environ)
env['ETCDCTL_ENDPOINT'] = hookenv.config().get('etcd')
check_call([
'etcdctl', 'set', '/{{ relay_name }}/{{ counterpart }}',
json.dumps(local_data)
],
env=env)
kv = unitdata.kv()
kv.set('relay.local.relation.name', relname)
kv.set('relay.local.relation.role', role)
kv.set('relay.remote.relation.role', '{{ counterpart }}')
kv.flush(save=True)
#!/usr/bin/env python3
import json
import os
import sys
from subprocess import check_call
sys.path.append('lib')
from charmhelpers.core import hookenv, unitdata
if __name__ == '__main__':
relname = hookenv.relation_type()
role, _ = hookenv.relation_to_role_and_interface(relname)
local_data = hookenv.relation_get()
env = {}
env.update(os.environ)
env['ETCDCTL_ENDPOINT'] = hookenv.config().get('etcd')
check_call(['etcdctl', 'set', '/{{ relay_name }}/{{ counterpart }}', json.dumps(local_data)], env=env)
kv = unitdata.kv()
kv.set('relay.local.relation.name', relname)
kv.set('relay.local.relation.role', role)
kv.set('relay.remote.relation.role', '{{ counterpart }}')
kv.flush(save=True)
# Invoke update-status immediately to trigger polling etcd
os.execl(os.path.join(hookenv.charm_dir(), 'hooks/update-status'), 'update-status')
