Disable type registration when buscribe connects to the DB

Because those types don't exist in the buscribe DB.

buscribe/buscribe/main.py

@@ -40,7 +40,7 @@ def main(channel, database="", base_dir=".",
     segments_dir = os.path.join(base_dir, channel, "source")
 
     logging.debug("Grabbing database...")
-    db_manager = DBManager(dsn=database)
+    db_manager = DBManager(dsn=database, register_types=False)
     db_conn = db_manager.get_conn()
     db_cursor = db_conn.cursor()
     logging.debug("Got database cursor.")

common/common/database.py

@@ -41,16 +41,22 @@ class DBManager(object):
 	for easy creation of new connections, and sets some defaults before
 	returning them.
 
+	By default, assumes it is connecting to the main wubloader database
+	and registers known composite types (so they get returned as namedtuples).
+	If you don't want this (eg. you're not connecting to the main database),
+	set register_types=False.
+
 	It has the ability to serve as a primitive connection pool, as getting a
 	new conn will return existing conns it knows about first, but you
 	should use a real conn pool for any non-trivial use.
 
 	Returned conns are set to seralizable isolation level, autocommit, and use
 	NamedTupleCursor cursors."""
-	def __init__(self, connect_timeout=30, **connect_kwargs):
+	def __init__(self, connect_timeout=30, register_types=True, **connect_kwargs):
 		patch_psycopg()
 		self.conns = []
 		self.connect_timeout = connect_timeout
+		self.register_types = register_types
 		self.connect_kwargs = connect_kwargs
 
 	def put_conn(self, conn):
@@ -67,6 +73,7 @@ class DBManager(object):
 		# searches or targetted single-row updates.
 		conn.isolation_level = psycopg2.extensions.ISOLATION_LEVEL_SERIALIZABLE
 		conn.autocommit = True
+		if self.register_types:
 			for composite in COMPOSITE_TYPES:
 				psycopg2.extras.register_composite(composite, conn)
 		return conn