conditionally import sqlite and postgres in engines/__init__.py

1 files changed, 4 insertions, 2 deletions

diff --git a/synapse/storage/engines/__init__.py b/synapse/storage/engines/__init__.py

index f51b3d228e..6b0024c611 100644
--- a/synapse/storage/engines/__init__.py
+++ b/synapse/storage/engines/__init__.py
@@ -14,17 +14,19 @@
 from typing import Any, Mapping
 
 from ._base import BaseDatabaseEngine, IncorrectDatabaseSetup
-from .postgres import PostgresEngine
-from .sqlite import Sqlite3Engine
 
 
 def create_engine(database_config: Mapping[str, Any]) -> BaseDatabaseEngine:
     name = database_config["name"]
 
     if name == "sqlite3":
+        from .sqlite import Sqlite3Engine
+
         return Sqlite3Engine(database_config)
 
     if name == "psycopg2":
+        from .postgres import PostgresEngine
+
         return PostgresEngine(database_config)
 
     raise RuntimeError("Unsupported database engine '%s'" % (name,))