4am redis storage

• A command is an JSON serialised object stored in redis, the id of the command is composed by:

'cmd-#{type}:#{entity id}:#{cmd id}'

type : 'group' or 'host' it is the type of the entity where the command need to be executed

entity id : is the id representing the host or group in the database

cmd id : is the id representing the command * to get an available id for the command, we use '#{type}-#{entity id}:max' this key store the max id for each host/group. (dont forget to increment it).

• All commands are emited to '4am-command' channel, it's a publish subscribe redis component
  • when publishing a command, we publish the id of the command