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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 hook | |
| from charms.reactive import scopes | |
| class PostgreSQLClient(RelationBase): | |
| # We only expect a single pgsql server to be related. Additionally, if | |
| # there are multiple units, it would be for replication purposes only, | |
| # so we would expect a leader to provide our connection info, or at least | |
| # for all pgsql units to agree on the connection info. Thus, we use a | |
| # global conversation scope in which all services and units share the | |
| # same conversation. | |
| scope = scopes.GLOBAL | |
| # These remote data fields will be automatically mapped to accessors | |
| # with a basic documentation string provided. | |
| auto_accessors = ['host', 'port', 'database', 'user', 'password', | |
| 'schema_user', 'schema_password'] | |
| @hook('{requires:pgsql}-relation-{joined,changed}') | |
| def changed(self): | |
| self.set_state('{relation_name}.connected') | |
| if self.connection_string(): | |
| self.set_state('{relation_name}.database.available') | |
| def request_roles(self, *roles): | |
| """ | |
| Tell the PostgreSQL server to provide our user with a certain set of roles. | |
| :param list roles: One or more role names to give to this service's user. | |
| """ | |
| self.set_remote('roles', ','.join(roles)) | |
| def change_database_name(self, dbname): | |
| """ | |
| Tell the PostgreSQL server to provide us with a database with a specific name. | |
| :param str dbname: New name for the database to use. | |
| """ | |
| self.set_remote('database', dbname) | |
| def connection_string(self): | |
| """ | |
| Get the connection string, if available, or None. | |
| """ | |
| data = { | |
| 'host': self.host(), | |
| 'port': self.port(), | |
| 'database': self.database(), | |
| 'user': self.user(), | |
| 'password': self.password(), | |
| } | |
| if all(data.values()): | |
| return str.format( | |
| 'host={host} port={port} dbname={database} user={user} password={password}', | |
| **data) | |
| return None |