Use psycopg2 type stubs

changelog.d/12269.misc

@@ -0,0 +1 @@
+Use type stubs for `psycopg2`.

setup.py

@@ -108,6 +108,7 @@ def exec_file(path_segments):
     "types-jsonschema>=3.2.0",
     "types-opentracing>=2.4.2",
     "types-Pillow>=8.3.4",
+    "types-psycopg2>=2.9.9",
     "types-pyOpenSSL>=20.0.7",
     "types-PyYAML>=5.4.10",
     "types-requests>=2.26.0",

synapse/storage/database.py

@@ -305,7 +305,15 @@ def execute_values(self, sql: str, *args: Any, fetch: bool = True) -> List[Tuple
         from psycopg2.extras import execute_values  # type: ignore
 
         return self._do_execute(
-            lambda *x: execute_values(self.txn, *x, fetch=fetch), sql, *args
+            # Type ignore: mypy is unhappy because if `x` is a 5-tuple, then there will
+            # be two values for `fetch`: one given positionally, and another given
+            # as a keyword argument. We might be able to fix this by
+            # - propagating the signature of psycopg2.extras.execute_values to this
+            #   function, or
+            # - changing `*args: Any` to `values: T` for some appropriate T.
+            lambda *x: execute_values(self.txn, *x, fetch=fetch),  # type: ignore[misc]
+            sql,
+            *args,
         )
 
     def execute(self, sql: str, *args: Any) -> None:

synapse/storage/engines/__init__.py

@@ -27,7 +27,7 @@ def create_engine(database_config) -> BaseDatabaseEngine:
 
     if name == "psycopg2":
         # Note that psycopg2cffi-compat provides the psycopg2 module on pypy.
-        import psycopg2  # type: ignore
+        import psycopg2
 
         return PostgresEngine(psycopg2, database_config)