fix error

Author: hzarka

cadence/connection.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import getpass
 import os
 import socket
 from dataclasses import dataclass
@@ -194,7 +195,7 @@ def default_tchannel_headers():
     @staticmethod
     def default_application_headers():
         return {
-            "user-name": os.environ.get("LOGNAME", os.getlogin()),
+            "user-name": getpass.getuser(),
             "host-name": socket.gethostname(),
             # Copied from Java client
             "cadence-client-library-version": "2.2.0",

cadence/workflow.py

@@ -194,7 +194,7 @@ def exec_workflow(workflow_client, wm: WorkflowMethod, args, workflow_options: W
     start_request = create_start_workflow_request(workflow_client, wm, args)
     start_response, err = workflow_client.service.start_workflow(start_request)
     if err:
-        raise Exception(err)
+        raise Exception(repr(err))
     execution = WorkflowExecution(workflow_id=start_request.workflow_id, run_id=start_response.run_id)
     stub_instance._execution = execution
     return WorkflowExecutionContext(workflow_type=wm._name, workflow_execution=execution)