cam event handler

Receives events from GNU motion and loads them into Redis.

The Redis schema contains three key patterns:

• events:enum:<cameraId>:<motionEventNumber>
  • Temporary map of camera:motionEventId to event UUID
  • This handler will simply override any preexisting key
  • A TTL of 1 hour is set for auto-cleanup
• events:time:<cameraId>
  • Sorted set
  • Score is equal to the unix timestamp of the event
  • Value is the event UUID
• events:data:<event-UUID>
  • Hash
  • Stores all the relevant data of the event
    • Timestamp: Unix Timestamp of the event
    • Camera: Camera id (thread number of motion config)
    • ImageFile: Full path of the most significant image
    • VideoFile: Full path of the video recording