Merge remote-tracking branch 'cweb/master'

1 files changed, 132 insertions, 0 deletions

diff --git a/mediagoblin/gmg_commands/dbupdate.py b/mediagoblin/gmg_commands/dbupdate.py
new file mode 100644
index 00000000..fa25ecb2
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+++ b/mediagoblin/gmg_commands/dbupdate.py
@@ -0,0 +1,132 @@
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import logging
+
+from sqlalchemy.orm import sessionmaker
+
+from mediagoblin.db.open import setup_connection_and_db_from_config
+from mediagoblin.db.migration_tools import MigrationManager
+from mediagoblin.init import setup_global_and_app_config
+from mediagoblin.tools.common import import_component
+
+_log = logging.getLogger(__name__)
+logging.basicConfig()
+_log.setLevel(logging.DEBUG)
+
+def dbupdate_parse_setup(subparser):
+    pass
+
+
+class DatabaseData(object):
+    def __init__(self, name, models, migrations):
+        self.name = name
+        self.models = models
+        self.migrations = migrations
+
+    def make_migration_manager(self, session):
+        return MigrationManager(
+            self.name, self.models, self.migrations, session)
+
+
+def gather_database_data(media_types, plugins):
+    """
+    Gather all database data relevant to the extensions we have
+    installed so we can do migrations and table initialization.
+
+    Returns a list of DatabaseData objects.
+    """
+    managed_dbdata = []
+
+    # Add main first
+    from mediagoblin.db.models import MODELS as MAIN_MODELS
+    from mediagoblin.db.migrations import MIGRATIONS as MAIN_MIGRATIONS
+
+    managed_dbdata.append(
+        DatabaseData(
+            u'__main__', MAIN_MODELS, MAIN_MIGRATIONS))
+
+    # Then get all registered media managers (eventually, plugins)
+    for media_type in media_types:
+        models = import_component('%s.models:MODELS' % media_type)
+        migrations = import_component('%s.migrations:MIGRATIONS' % media_type)
+        managed_dbdata.append(
+            DatabaseData(media_type, models, migrations))
+
+    for plugin in plugins:
+        try:
+            models = import_component('{0}.models:MODELS'.format(plugin))
+        except ImportError as exc:
+            _log.debug('No models found for {0}: {1}'.format(
+                plugin,
+                exc))
+
+            models = []
+        except AttributeError as exc:
+            _log.warning('Could not find MODELS in {0}.models, have you \
+forgotten to add it? ({1})'.format(plugin, exc))
+            models = []
+
+        try:
+            migrations = import_component('{0}.migrations:MIGRATIONS'.format(
+                plugin))
+        except ImportError as exc:
+            _log.debug('No migrations found for {0}: {1}'.format(
+                plugin,
+                exc))
+
+            migrations = {}
+        except AttributeError as exc:
+            _log.debug('Cloud not find MIGRATIONS in {0}.migrations, have you \
+forgotten to add it? ({1})'.format(plugin, exc))
+            migrations = {}
+
+        if models:
+            managed_dbdata.append(
+                    DatabaseData(plugin, models, migrations))
+
+
+    return managed_dbdata
+
+
+def run_dbupdate(app_config, global_config):
+    """
+    Initialize or migrate the database as specified by the config file.
+
+    Will also initialize or migrate all extensions (media types, and
+    in the future, plugins)
+    """
+
+    # Gather information from all media managers / projects
+    dbdatas = gather_database_data(
+            app_config['media_types'],
+            global_config.get('plugins', {}).keys())
+
+    # Set up the database
+    db = setup_connection_and_db_from_config(app_config, migrations=True)
+
+    Session = sessionmaker(bind=db.engine)
+
+    # Setup media managers for all dbdata, run init/migrate and print info
+    # For each component, create/migrate tables
+    for dbdata in dbdatas:
+        migration_manager = dbdata.make_migration_manager(Session())
+        migration_manager.init_or_migrate()
+
+
+def dbupdate(args):
+    global_config, app_config = setup_global_and_app_config(args.conf_file)
+    run_dbupdate(app_config, global_config)