psycopg2: fix cursor execute and executemany signatures (#2331)

* psycopg2: fix cursor execute and executemany signatures

The sql parameter is called query and the parameters are called vars and
vars_list.

* Fix execute test

Author: xrmx

elasticapm/instrumentation/packages/psycopg2.py

@@ -59,6 +59,12 @@ def _bake_sql(self, sql):
     def extract_signature(self, sql):
         return extract_signature(sql)
 
+    def execute(self, query, vars=None):
+        return self._trace_sql(self.__wrapped__.execute, query, vars)
+
+    def executemany(self, query, vars_list):
+        return self._trace_sql(self.__wrapped__.executemany, query, vars_list)
+
     def __enter__(self):
         return PGCursorProxy(self.__wrapped__.__enter__(), destination_info=self._self_destination_info)
 

tests/instrumentation/psycopg2_tests.py

@@ -266,6 +266,27 @@ def test_fully_qualified_table_name():
     assert "SELECT FROM db.schema.mytable" == actual
 
 
+@pytest.mark.integrationtest
+@pytest.mark.skipif(not has_postgres_configured, reason="PostgresSQL not configured")
+def test_cursor_execute_signature(instrument, postgres_connection, elasticapm_client):
+    cursor = postgres_connection.cursor()
+    cursor.execute(query="SELECT 1", vars=None)
+    row = cursor.fetchone()
+
+    assert row
+
+
+@pytest.mark.integrationtest
+@pytest.mark.skipif(not has_postgres_configured, reason="PostgresSQL not configured")
+def test_cursor_executemany_signature(instrument, postgres_connection, elasticapm_client):
+    cursor = postgres_connection.cursor()
+    res = cursor.executemany(
+        query="INSERT INTO test VALUES (%s, %s)",
+        vars_list=((4, "four"),),
+    )
+    assert res is None
+
+
 @pytest.mark.integrationtest
 @pytest.mark.skipif(not has_postgres_configured, reason="PostgresSQL not configured")
 def test_destination(instrument, postgres_connection, elasticapm_client):