Logger is destroyed during shutdown when it's still in use

[ellbosch]

We try to use the logger during shutdown but it appears that methods disappear during garbage collection. This issue pops up when shutdown is called in non-interactive mode. Here's a thread discussing the same issue.

Stack trace:

  File "/Users/ellbosch/Repos/mssql-cli/mssqlcli/mssql_cli.py", line 197, in __del__
  File "/Users/ellbosch/Repos/mssql-cli/mssqlcli/sqltoolsclient.py", line 90, in shutdown
  File "/Users/ellbosch/Repos/mssql-cli/mssqlcli/jsonrpc/jsonrpcclient.py", line 184, in shutdown
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1378, in info
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1514, in _log
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1524, in handle
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1586, in callHandlers
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 894, in handle
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1126, in emit
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1116, in _open
NameError: name 'open' is not defined