mediagoblin/gmg_commands/dbupdate.py

   1 # GNU MediaGoblin -- federated, autonomous media hosting
   2 # Copyright (C) 2011 MediaGoblin contributors.  See AUTHORS.
   3 #
   4 # This program is free software: you can redistribute it and/or modify
   5 # it under the terms of the GNU Affero General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU Affero General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU Affero General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 from mediagoblin.db.sql.open import setup_connection_and_db_from_config
  18 from mediagoblin.db.sql.util import (
  19     MigrationManager, assure_migrations_table_setup)
  20 from mediagoblin.init import setup_global_and_app_config
  21 from mediagoblin.tools.common import import_component
  22
  23
  24 class DatabaseData(object):
  25     def __init__(self, name, models, migrations):
  26         self.name = name
  27         self.models = models
  28         self.migrations = migrations
  29
  30     def make_migration_manager(self, db):
  31         return MigrationManager(
  32             self.name, self.models, self.migrations, db)
  33
  34
  35 def gather_database_data(media_types):
  36     """
  37     Gather all database data relevant to the extensions we have
  38     installed so we can do migrations and table initialization.
  39
  40     Returns a list of DatabaseData objects.
  41     """
  42     managed_dbdata = []
  43
  44     # Add main first
  45     from mediagoblin.db.sql.models import MODELS as MAIN_MODELS
  46     from mediagoblin.db.sql.migrations import MIGRATIONS as MAIN_MIGRATIONS
  47
  48     managed_dbdata.append(
  49         DatabaseData(
  50             '__main__', MAIN_MODELS, MAIN_MIGRATIONS))
  51
  52     # Then get all registered media managers (eventually, plugins)
  53     for media_type in media_types:
  54         models = import_component('%s.models:MODELS' % media_type)
  55         migrations = import_component('%s.migrations:MIGRATIONS' % media_type)
  56         managed_dbdata.append(
  57             DatabaseData(media_type, models, migrations))
  58
  59     return managed_dbdata
  60
  61
  62 def dbupdate(args):
  63     """
  64     Initialize or migrate the database as specified by the config file.
  65
  66     Will also initialize or migrate all extensions (media types, and
  67     in the future, plugins)
  68     """
  69     globa_config, app_config = setup_global_and_app_config(args.conf_file)
  70
  71     # Gather information from all media managers / projects
  72     dbdatas = gather_database_data(app_config['media_types'])
  73
  74     # Set up the database
  75     connection, db = setup_connection_and_db_from_config(app_config)
  76
  77     # If migrations table not made, make it!
  78     assure_migrations_table_setup(db)
  79
  80     # Setup media managers for all dbdata, run init/migrate and print info
  81     # For each component, create/migrate tables
  82     for dbdata in dbdatas:
  83         migration_manager = dbdata.make_migration_manager(db)
  84         migration_manager.init_or_migrate()