SNOW-761669: fix memory leak in c logging (#1479)

Author: sfc-gh-aling

DESCRIPTION.md

@@ -8,6 +8,10 @@ Source code is also available at: https://github.com/snowflakedb/snowflake-conne
 
 # Release Notes
 
+- v3.0.2(Unreleased)
+
+  - Fixed a memory leak in the logging module of the Cython extension
+
 - v3.0.1(February 28, 2023)
 
   - Improved the robustness of OCSP response caching to handle errors in cases of serialization and deserialization.

src/snowflake/connector/cpp/Logging/logging.cpp

@@ -46,11 +46,17 @@ void Logger::log(int level, const char *path_name, const char *func_name, int li
   py::UniqueRef call_log(PyObject_GetAttrString(logger, "log"));
 
   // prepare keyword args for snow_logger
-  PyDict_SetItemString(keywords.get(), "level", Py_BuildValue("i", level));
-  PyDict_SetItemString(keywords.get(), "path_name", Py_BuildValue("s", path_name));
-  PyDict_SetItemString(keywords.get(), "func_name", Py_BuildValue("s", func_name));
-  PyDict_SetItemString(keywords.get(), "line_num", Py_BuildValue("i", line_num));
-  PyDict_SetItemString(keywords.get(), "msg", Py_BuildValue("s", msg));
+  py::UniqueRef level_ref(Py_BuildValue("i", level));
+  py::UniqueRef path_name_ref(Py_BuildValue("s", path_name));
+  py::UniqueRef func_name_ref(Py_BuildValue("s", func_name));
+  py::UniqueRef line_num_ref(Py_BuildValue("i", line_num));
+  py::UniqueRef msg_ref(Py_BuildValue("s", msg));
+
+  PyDict_SetItemString(keywords.get(), "level", level_ref.get());
+  PyDict_SetItemString(keywords.get(), "path_name", path_name_ref.get());
+  PyDict_SetItemString(keywords.get(), "func_name", func_name_ref.get());
+  PyDict_SetItemString(keywords.get(), "line_num", line_num_ref.get());
+  PyDict_SetItemString(keywords.get(), "msg", msg_ref.get());
 
   // call snow_logging.SnowLogger.log()
   PyObject_Call(call_log.get(), Py_BuildValue("()"), keywords.get());

src/snowflake/connector/version.py

@@ -1,3 +1,3 @@
 # Update this for the versions
 # Don't change the forth version number from None
-VERSION = (3, 0, 1, None)
+VERSION = (3, 0, 2, None)