1 files changed, 56 insertions, 0 deletions
diff --git a/synapse/storage/engines/postgres.py b/synapse/storage/engines/postgres.py
new file mode 100644
index 0000000000..a323028546
--- /dev/null
+++ b/synapse/storage/engines/postgres.py
@@ -0,0 +1,56 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from synapse.storage import prepare_database
+
+from ._base import IncorrectDatabaseSetup
+
+
+class PostgresEngine(object):
+    def __init__(self, database_module):
+        self.module = database_module
+        self.module.extensions.register_type(self.module.extensions.UNICODE)
+
+    def check_database(self, txn):
+        txn.execute("SHOW SERVER_ENCODING")
+        rows = txn.fetchall()
+        if rows and rows[0][0] != "UTF8":
+            raise IncorrectDatabaseSetup(
+                "Database has incorrect encoding: '%s' instead of 'UTF8'\n"
+                "See docs/postgres.rst for more information."
+                % (rows[0][0],)
+            )
+
+    def convert_param_style(self, sql):
+        return sql.replace("?", "%s")
+
+    def on_new_connection(self, db_conn):
+        db_conn.set_isolation_level(
+            self.module.extensions.ISOLATION_LEVEL_REPEATABLE_READ
+        )
+
+    def prepare_database(self, db_conn):
+        prepare_database(db_conn, self)
+
+    def is_deadlock(self, error):
+        if isinstance(error, self.module.DatabaseError):
+            return error.pgcode in ["40001", "40P01"]
+        return False
+
+    def is_connection_closed(self, conn):
+        return bool(conn.closed)
+
+    def lock_table(self, txn, table):
+        txn.execute("LOCK TABLE %s in EXCLUSIVE MODE" % (table,))