Turned SDK APIs into context manager

CHANGELOG.md

@@ -57,6 +57,7 @@ All notable changes to the Zowe Client Python SDK will be documented in this fil
 - Added method to load profile properties from environment variables [#136](https://github.com/zowe/zowe-client-python-sdk/issues/136)
 - Added validation of zowe.config.json file matching the schema [#192](https://github.com/zowe/zowe-client-python-sdk/issues/192)
 - Added Secrets SDK for storing client secrets in OS keyring [#208](https://github.com/zowe/zowe-client-python-sdk/issues/208)
+- Turned SDK APIs into context manager [#145](https://github.com/zowe/zowe-client-python-sdk/issues/145)
 
 ### Bug Fixes
 

src/core/zowe/core_for_zowe_sdk/request_handler.py

@@ -42,6 +42,7 @@ def __init__(self, session_arguments, logger_name = __name__):
         logger_name
             The logger name of the modules calling request handler
         """
+        self.session = requests.Session()
         self.session_arguments = session_arguments
         self.valid_methods = ["GET", "POST", "PUT", "DELETE"]
         self.__handle_ssl_warnings()
@@ -96,11 +97,15 @@ def __validate_method(self):
 
     def __send_request(self, stream=False):
         """Build a custom session object, prepare it with a custom request and send it."""
-        session = requests.Session()
+        session = self.session
         request_object = requests.Request(method=self.method, **self.request_arguments)
         prepared = session.prepare_request(request_object)
         self.response = session.send(prepared, stream=stream, **self.session_arguments)
 
+    def __del__(self):
+        """Clean up the REST session object once it is no longer needed anymore"""
+        self.session.close()
+
     def __validate_response(self):
         """Validate if request response is acceptable based on expected code list.
 

src/core/zowe/core_for_zowe_sdk/sdk_api.py

@@ -56,6 +56,12 @@
             self.default_headers["Authorization"] = f"Bearer {self.session.tokenValue}"
         elif self.session.type == session_constants.AUTH_TYPE_TOKEN:
             self.default_headers["Cookie"] = f"{self.session.tokenType}={self.session.tokenValue}"
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exception, traceback):
+        del self.request_handler
 
     def _create_custom_request_arguments(self):
         """Create a copy of the default request arguments dictionary.