Add utility class to support background server #646
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Summary: Rewrite the server to use asyncio and be multithreaded. Allows handling multiple clients. Test Plan: Tests updated. Later test also tests multiple db writes simultaneously.
Summary: Use scoped sessions that is shared between threads to allow async db operations. Test Plan: Tests should pass
Summary: Logging levels were used inconsistently and would cause problems with multithreaded servers. We remove this ability. Test Plan: Tests updated.
Summary: All message handlers will emit a info logging message to support better live tracking of server functions. Test Plan: Tests should pass
Summary: To support multi client server, strategy methods will not act on copies of models to avoid changing tensor gradients between two threads. Test Plan: New test
Summary: A subclass of the aepsych server with methods specifically to run the server in a background process. This will be used to ensured that even within the same main script, the server will run like an actual server and does not do anything sneaky like bypassing the async queue. Test Plan: New test
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Summary: A subclass of the aepsych server with methods specifically to run the server in a background process. This will be used to ensured that even within the same main script, the server will run like an actual server and does not do anything sneaky like bypassing the async queue.
Test Plan: New test
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