Global variables dangerous for multi process / threaded servers

[camallen]

aggregation-for-caesar/panoptes_aggregation/panoptes/userify.py

Line 69 in b6b7ee4

global users

Related to #165 once running behind a multi process / threaded server the global variables won't be safe for cached data like the users and destinations variables. It may be that this works ok in multi process context but i assume the users store changes will fail in a threaded environment.

https://stackoverflow.com/questions/32815451/are-global-variables-thread-safe-in-flask-how-do-i-share-data-between-requests

This cached data should be stored in external cache system (a hosted memcache/redis instance) instead of global vars.

The same can be said for the panoptes client for re-use vs setting it up over and over again, though the client may be smart enough to avoid running the login code multiple times.