Commits on Dec 19, 2022

1. Trigger gevent monkeypatching via environment variable …

   Gevent needs to monkeypatch a number of system libraries as soon
   as possible when Python interpreter starts, in order to avoid
   other libraries monkey-patching them before. We should do it before
   any other initialization and it needs to be only run on webserver.
   
   So far it was done by local_settings monkeypatching but that has
   been rather brittle and some changes in Airflow made previous attempts
   to stop working because the "other" packages could be loaded by
   Airflow before - depending on installed providers and configuration
   (for example when you had AWS configured as logger, boto could have
   been loaded before and it could have monkey patch networking before
   gevent had a chance to do so.
   
   This change introduces different mechanism of triggering the
   patching - it could be triggered by setting an environment variable.
   This has the benefit that we do not need to initialize anything
   (including reading settings or setting up logging) before we determine
   if gevent patching should be performed.
   
   It has also the drawback that the user will have to set the environment
   variable in their deployment manually. However this is a small price to
   pay if they will get a stable and future-proof gevent monkeypatching
   built-in in Airflow.
   
   Fixes: apache#8212

   

   potiuk committed Dec 19, 2022
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