Move db/util.py -> db/mongo/util.py

- Change some reference
- Provide a wrapper db/util.py

1 files changed, 2 insertions, 276 deletions

diff --git a/mediagoblin/db/util.py b/mediagoblin/db/util.py
index e2065693..3fd96a1d 100644
--- a/mediagoblin/db/util.py
+++ b/mediagoblin/db/util.py
@@ -14,279 +14,5 @@
 # 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/>.
 
-"""
-Utilities for database operations.
-
-Some note on migration and indexing tools:
-
-We store information about what the state of the database is in the
-'mediagoblin' document of the 'app_metadata' collection.  Keys in that
-document relevant to here:
-
- - 'migration_number': The integer representing the current state of
-   the migrations
-"""
-
-import copy
-
-# Imports that other modules might use
-from pymongo import ASCENDING, DESCENDING
-from pymongo.errors import InvalidId
-from mongokit import ObjectId
-
-from mediagoblin.db.mongo.indexes import ACTIVE_INDEXES, DEPRECATED_INDEXES
-
-
-################
-# Indexing tools
-################
-
-
-def add_new_indexes(database, active_indexes=ACTIVE_INDEXES):
-    """
-    Add any new indexes to the database.
-
-    Args:
-     - database: pymongo or mongokit database instance.
-     - active_indexes: indexes to possibly add in the pattern of:
-       {'collection_name': {
-            'identifier': {
-                'index': [index_foo_goes_here],
-                'unique': True}}
-       where 'index' is the index to add and all other options are
-       arguments for collection.create_index.
-
-    Returns:
-      A list of indexes added in form ('collection', 'index_name')
-    """
-    indexes_added = []
-
-    for collection_name, indexes in active_indexes.iteritems():
-        collection = database[collection_name]
-        collection_indexes = collection.index_information().keys()
-
-        for index_name, index_data in indexes.iteritems():
-            if not index_name in collection_indexes:
-                # Get a copy actually so we don't modify the actual
-                # structure
-                index_data = copy.copy(index_data)
-                index = index_data.pop('index')
-                collection.create_index(
-                    index, name=index_name, **index_data)
-
-                indexes_added.append((collection_name, index_name))
-
-    return indexes_added
-
-
-def remove_deprecated_indexes(database, deprecated_indexes=DEPRECATED_INDEXES):
-    """
-    Remove any deprecated indexes from the database.
-
-    Args:
-     - database: pymongo or mongokit database instance.
-     - deprecated_indexes: the indexes to deprecate in the pattern of:
-       {'collection_name': {
-            'identifier': {
-                'index': [index_foo_goes_here],
-                'unique': True}}
-
-       (... although we really only need the 'identifier' here, as the
-       rest of the information isn't used in this case.  But it's kept
-       around so we can remember what it was)
-
-    Returns:
-      A list of indexes removed in form ('collection', 'index_name')
-    """
-    indexes_removed = []
-
-    for collection_name, indexes in deprecated_indexes.iteritems():
-        collection = database[collection_name]
-        collection_indexes = collection.index_information().keys()
-
-        for index_name, index_data in indexes.iteritems():
-            if index_name in collection_indexes:
-                collection.drop_index(index_name)
-
-                indexes_removed.append((collection_name, index_name))
-
-    return indexes_removed
-
-
-#################
-# Migration tools
-#################
-
-# The default migration registry...
-#
-# Don't set this yourself!  RegisterMigration will automatically fill
-# this with stuff via decorating methods in migrations.py
-
-class MissingCurrentMigration(Exception):
-    pass
-
-
-MIGRATIONS = {}
-
-
-class RegisterMigration(object):
-    """
-    Tool for registering migrations
-
-    Call like:
-
-    @RegisterMigration(33)
-    def update_dwarves(database):
-        [...]
-
-    This will register your migration with the default migration
-    registry.  Alternately, to specify a very specific
-    migration_registry, you can pass in that as the second argument.
-
-    Note, the number of your migration should NEVER be 0 or less than
-    0.  0 is the default "no migrations" state!
-    """
-    def __init__(self, migration_number, migration_registry=MIGRATIONS):
-        assert migration_number > 0, "Migration number must be > 0!"
-        assert migration_number not in migration_registry, \
-            "Duplicate migration numbers detected!  That's not allowed!"
-
-        self.migration_number = migration_number
-        self.migration_registry = migration_registry
-
-    def __call__(self, migration):
-        self.migration_registry[self.migration_number] = migration
-        return migration
-
-
-class MigrationManager(object):
-    """
-    Migration handling tool.
-
-    Takes information about a database, lets you update the database
-    to the latest migrations, etc.
-    """
-    def __init__(self, database, migration_registry=MIGRATIONS):
-        """
-        Args:
-         - database: database we're going to migrate
-         - migration_registry: where we should find all migrations to
-           run
-        """
-        self.database = database
-        self.migration_registry = migration_registry
-        self._sorted_migrations = None
-
-    def _ensure_current_migration_record(self):
-        """
-        If there isn't a database[u'app_metadata'] mediagoblin entry
-        with the 'current_migration', throw an error.
-        """
-        if self.database_current_migration() is None:
-            raise MissingCurrentMigration(
-                "Tried to call function which requires "
-                "'current_migration' set in database")
-
-    @property
-    def sorted_migrations(self):
-        """
-        Sort migrations if necessary and store in self._sorted_migrations
-        """
-        if not self._sorted_migrations:
-            self._sorted_migrations = sorted(
-                self.migration_registry.items(),
-                # sort on the key... the migration number
-                key=lambda migration_tuple: migration_tuple[0])
-
-        return self._sorted_migrations
-
-    def latest_migration(self):
-        """
-        Return a migration number for the latest migration, or 0 if
-        there are no migrations.
-        """
-        if self.sorted_migrations:
-            return self.sorted_migrations[-1][0]
-        else:
-            # If no migrations have been set, we start at 0.
-            return 0
-
-    def set_current_migration(self, migration_number):
-        """
-        Set the migration in the database to migration_number
-        """
-        # Add the mediagoblin migration if necessary
-        self.database[u'app_metadata'].update(
-            {u'_id': u'mediagoblin'},
-            {u'$set': {u'current_migration': migration_number}},
-            upsert=True)
-
-    def install_migration_version_if_missing(self):
-        """
-        Sets the migration to the latest version if no migration
-        version at all is set.
-        """
-        mgoblin_metadata = self.database[u'app_metadata'].find_one(
-            {u'_id': u'mediagoblin'})
-        if not mgoblin_metadata:
-            latest_migration = self.latest_migration()
-            self.set_current_migration(latest_migration)
-
-    def database_current_migration(self):
-        """
-        Return the current migration in the database.
-        """
-        mgoblin_metadata = self.database[u'app_metadata'].find_one(
-            {u'_id': u'mediagoblin'})
-        if not mgoblin_metadata:
-            return None
-        else:
-            return mgoblin_metadata[u'current_migration']
-
-    def database_at_latest_migration(self):
-        """
-        See if the database is at the latest migration.
-        Returns a boolean.
-        """
-        current_migration = self.database_current_migration()
-        return current_migration == self.latest_migration()
-
-    def migrations_to_run(self):
-        """
-        Get a list of migrations to run still, if any.
-        
-        Note that calling this will set your migration version to the
-        latest version if it isn't installed to anything yet!
-        """
-        self._ensure_current_migration_record()
-
-        db_current_migration = self.database_current_migration()
-
-        return [
-            (migration_number, migration_func)
-            for migration_number, migration_func in self.sorted_migrations
-            if migration_number > db_current_migration]
-
-    def migrate_new(self, pre_callback=None, post_callback=None):
-        """
-        Run all migrations.
-
-        Includes two optional args:
-         - pre_callback: if called, this is a callback on something to
-           run pre-migration.  Takes (migration_number, migration_func)
-           as arguments
-         - pre_callback: if called, this is a callback on something to
-           run post-migration.  Takes (migration_number, migration_func)
-           as arguments
-        """
-        # If we aren't set to any version number, presume we're at the
-        # latest (which means we'll do nothing here...)
-        self.install_migration_version_if_missing()
-
-        for migration_number, migration_func in self.migrations_to_run():
-            if pre_callback:
-                pre_callback(migration_number, migration_func)
-            migration_func(self.database)
-            self.set_current_migration(migration_number)
-            if post_callback:
-                post_callback(migration_number, migration_func)
+from mediagoblin.db.mongo.util import (MigrationManager, ObjectId, InvalidId,
+    DESCENDING)