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/*
*** WORK IN PROGRESS ***
Zeus mode
A Zeus instance can load all of the available imperial monitor plugins, but instead of spawning
vassals it delegates actions to Emperors connected to it.
The Zeus instance try to distribute vassals evenly between Emperors.
Emperors register to one (ore more, maybe...) Zeus instance, passing various informations (like the maximum number
of vassals it can manage)
to spawn a Zeus:
# unencrypted mode
uwsgi --zeus "192.168.173.17:4040 /etc/uwsgi/vassals"
# crypted mode
uwsgi --zeus "192.168.173.17:4040,foobar.crt,foobar.key /etc/uwsgi/vassals"
# crypted + authentication mode
uwsgi --zeus "192.168.173.17:4040,foobar.crt,foobar.key,clients.pem /etc/uwsgi/vassals"
to connect an Emperor to Zeus
# unencrypted mode
uwsgi --emperor zeus:192.168.173.17:4040
# crypted mode
uwsgi --emperor zeus-ssl:192.168.173.17:4040
# crypted + authentication mode
uwsgi --emperor zeus-ssl:192.168.173.17:4040,myself.key
Protocol
(each message is a basic uwsgi packet: modifier1 pktsize modifier2 payload)
modifier2 identifies the type of the message
0 -> I_AM_ALIVE {node: 'node001', max_vassals: '100', running_vassals: '17'} [ emperor -> zeus ]
1 -> NEW_VASSAL {name: 'foobar.ini'} [ zeus -> the choosen emperor ]
2 -> ACCEPTED_VASSAL {name: 'foobar.ini'} [ emperor -> zeus ]
3 -> CONFIG_CHUNK {name: 'foobar.ini', body: '[uwsgi].....'} [ zeus -> the choosen emperor ]
4 -> CONFIG_END {name: 'foobar.ini'} [ zeus -> the choosen emperor ]
5 -> VASSAL_SPAWNED {name: 'foobar.ini'} [the choosen emperor -> zeus]
6 -> VASSAL_REJECTED {name: 'foobar.ini'} [the choosen emperor -> zeus]
7 -> VASSAL_RELOAD {name: 'foobar.ini'} [ zeus -> the choosen emperor ]
8 -> VASSAL_UPDATE {name: 'foobar.ini'} [ zeus -> the choosen emperor ]
9 -> VASSAL_DESTROY {name: 'foobar.ini'} [ zeus -> the choosen emperor ]
10 -> VASSAL_RELOADED {name: 'foobar.ini'} [the choosen emperor -> zeus]
11 -> VASSAL_DESTROYED {name: 'foobar.ini'} [the choosen emperor -> zeus]
*/
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