New agent logic

[AndWeHaveAPlan]

flowchart TD
  
  subgraph Controller
    direction LR
    CRegEvent(Register tray) --> CReg[register]
    CReg~~~CPingEvent
    CPingEvent(Ping) ---> Check[Check tray]
    Check ~~~ Notification(Agent notification)
    Notification --> reason{reason?}
    reason -->|reason 0,1,3,4| DeleteTray[Delete tray]
    reason -->|reason 2| MR[Mark for restart] --> DeleteTray[Delete tray]
    DeleteTray[Delete tray] --> CleanDb[Clean DB]
  end

  Check -->|result| Ping
  Ping --> CPingEvent
  Note --> Notification

  subgraph Agent
    direction TB

    Start((Start)) --> Reg[Register with controller]
    Reg-->CRegEvent
    Reg --> Listener[Start Listener]
    Listener --> Ping[Ping controller]
    Ping[Ping controller] ----> If{Ok?}
    
    
    Wait[Wait N sec]
    If -- no ---> SL[Stop listener]
    SL -- reason 4 --> SS
    If -->|yes| Wait[Wait N sec]
    Wait --> Ping
    SS[Start shutdown] --> Note[Notify controller]
    
    subgraph Events [Events]
      Term(SIG TERM)
      LF(Listener finish)        
      File(File trigger)
    end

    LF(Listener finish) -- reason 1 --> SS    
    File(File trigger) -- reason 2 --> SS
    Term(SIG TERM) -- reason 3 --> SS
    Note --> Shutdown((Shutdown))
  end

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