def tls_certificates_relation_changed():
unitname = local_unit().replace('/', '_')
cert_name = '{0}.server.cert'.format(unitname)
key_name = '{0}.server.key'.format(unitname)
cert = relation_get(cert_name)
key = relation_get(key_name)
ca = relation_get('ca')
if not cert or not key:
log("tls-certificates client's relation data is not fully available")
cert = key = None
tls_changed(cert, key, ca)
def tls_certificates_relation_departed():
tls_changed(None, None, None)