Factor out most of the database connection into db/open.py

I needed to split the db connection/opening into open.py,
due to an import loop:
- util.py needs db/util.py:ObjectId
- db/util.py would need db/models.py
- db/models.py needs util.py:slugify

mediagoblin/app.py

@@ -21,8 +21,7 @@ from paste.deploy.converters import asbool
 from webob import Request, exc
 
 from mediagoblin import routing, util, storage, staticdirect
-from mediagoblin.db import models
-from mediagoblin.db.util import connect_database_from_config
+from mediagoblin.db.open import setup_connection_and_db_from_config
 from mediagoblin.globals import setup_globals
 from mediagoblin.celery_setup import setup_celery_from_config
 
@@ -35,7 +34,7 @@ class MediaGoblinApp(object):
     """
     Really basic wsgi app using routes and WebOb.
     """
-    def __init__(self, connection, database_path,
+    def __init__(self, connection, db,
                  public_store, queue_store,
                  staticdirector,
                  email_sender_address, email_debug_mode,
@@ -49,8 +48,7 @@ class MediaGoblinApp(object):
 
         # Set up database
         self.connection = connection
-        self.db = connection[database_path]
-        models.register_models(connection)
+        self.db = db
 
         # set up routing
         self.routing = routing.get_mapper()
@@ -118,7 +116,7 @@ class MediaGoblinApp(object):
 
 def paste_app_factory(global_config, **app_config):
     # Get the database connection
-    connection = connect_database_from_config(app_config)
+    connection, db = setup_connection_and_db_from_config(app_config)
 
     # Set up the storage systems.
     public_store = storage.storage_system_from_paste_config(
@@ -143,7 +141,7 @@ def paste_app_factory(global_config, **app_config):
     setup_celery_from_config(app_config, global_config)
 
     mgoblin_app = MediaGoblinApp(
-        connection, app_config.get('db_name', 'mediagoblin'),
+        connection, db,
         public_store=public_store, queue_store=queue_store,
         staticdirector=staticdirector,
         email_sender_address=app_config.get(

mediagoblin/celery_setup/from_celery.py

@@ -20,8 +20,7 @@ from paste.deploy.loadwsgi import NicerConfigParser
 from paste.deploy.converters import asbool
 
 from mediagoblin import storage
-from mediagoblin.db import models
-from mediagoblin.db.util import connect_database_from_config
+from mediagoblin.db.open import setup_connection_and_db_from_config
 from mediagoblin.celery_setup import setup_celery_from_config
 from mediagoblin.globals import setup_globals
 from mediagoblin import globals as mgoblin_globals
@@ -69,10 +68,7 @@ def setup_self(setup_globals_func=setup_globals):
         settings_module=OUR_MODULENAME,
         set_environ=False)
 
-    connection = connect_database_from_config(mgoblin_section)
-
-    db = connection[mgoblin_section.get('db_name', 'mediagoblin')]
-    models.register_models(connection)
+    connection, db = setup_connection_and_db_from_config(mgoblin_section)
 
     # Set up the storage systems.
     public_store = storage.storage_system_from_paste_config(

mediagoblin/db/open.py

@@ -0,0 +1,37 @@
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011 Free Software Foundation, Inc
+#
+# 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 mongokit
+from paste.deploy.converters import asint
+from mediagoblin.db import models
+
+
+def connect_database_from_config(app_config):
+    """Connect to the main database, take config from app_config"""
+    port = app_config.get('db_port')
+    if port:
+        port = asint(port)
+    connection = mongokit.Connection(
+        app_config.get('db_host'), port)
+    return connection
+
+def setup_connection_and_db_from_config(app_config):
+    connection = connect_database_from_config(app_config)
+    database_path = app_config.get('db_name', 'mediagoblin')
+    db = connection[database_path]
+    models.register_models(connection)
+    # Could configure indexes here on db
+    return (connection, db)

mediagoblin/db/util.py

@@ -14,20 +14,7 @@
 # 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 mongokit
-
-from paste.deploy.converters import asint
 
 # Imports that other modules might use
 from pymongo import DESCENDING
 from mongokit import ObjectId
-
-
-def connect_database_from_config(app_config):
-    """Connect to the main database, take config from app_config"""
-    port = app_config.get('db_port')
-    if port:
-        port = asint(port)
-    connection = mongokit.Connection(
-        app_config.get('db_host'), port)
-    return connection