--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/annot-server/utils.py	Wed Oct 08 15:14:58 2014 +0200
@@ -0,0 +1,36 @@
+
+#
+# See LICENCE for detail
+# Copyright (c) 2014 IRI
+#
+
+import psycopg2.extras
+
+from twisted.python import log
+
+from txpostgres.txpostgres import Connection, ConnectionPool
+
+
+PIANOROLL_CHANNEL = 'PIANOROLL'
+ANNOTATION_CHANNEL = 'ANNOT'
+
+class DictConnection(Connection):
+
+    @staticmethod
+    def connectionFactory(*args, **kwargs):
+        kwargs['connection_factory'] = psycopg2.extras.DictConnection
+        return psycopg2.connect(*args, **kwargs)
+
+
+class DictConnectionPool(ConnectionPool):
+    connectionFactory = DictConnection
+
+
+def create_connection_pool(conn_string):
+
+    created_connection_pool = DictConnectionPool(None, conn_string)
+
+    d = created_connection_pool.start()
+    d.addErrback(log.err)
+
+    return created_connection_pool, d