go/r3events/marshal_events.go

   1 // (c) Bernhard Tittelbach, 2013
   2
   3 package r3events
   4
   5 import (
   6     "encoding/json"
   7     "fmt"
   8     "errors"
   9     "strings"
  10     )
  11
  12 func NameOfStruct(evi interface{}) (name string) {
  13     etype := fmt.Sprintf("%T", evi)
  14     etype_lastsep := strings.LastIndex(etype,".")
  15     return etype[etype_lastsep+1:] //works in all cases for etype_lastsep in range -1 to len(etype)-1
  16 }
  17
  18 func MarshalEvent2ByteByte(event_interface interface{}) (data [][]byte, err error) {
  19     var msg []byte
  20     //~ fmt.Printf("%T%+v\n", event_interface, event_interface)
  21         msg, err = json.Marshal(event_interface)
  22         if err != nil {
  23                 return
  24         }
  25     data = [][]byte{[]byte(NameOfStruct(event_interface)), msg} //works in all cases for etype_lastsep in range -1 to len(etype)-1
  26     return
  27 }
  28
  29 func UnmarshalByteByte2Event(data [][]byte) (event interface{}, category string, err error) {
  30     if len(data) != 2 {
  31         return nil, "", errors.New("not a r3event message")
  32     }
  33     switch string(data[0]) {
  34         case "DoorLockUpdate":
  35             newevent := new(DoorLockUpdate)
  36             err = json.Unmarshal(data[1],newevent)
  37             category = "door"
  38             event = *newevent
  39         case "DoorAjarUpdate":
  40             newevent := new(DoorAjarUpdate)
  41             err = json.Unmarshal(data[1], newevent)
  42             category = "door"
  43             event = *newevent
  44         case "BackdoorAjarUpdate":
  45             newevent := new(BackdoorAjarUpdate)
  46             err = json.Unmarshal(data[1], newevent)
  47             category = "door"
  48             event = *newevent
  49         case "DoorCommandEvent":
  50             newevent := new(DoorCommandEvent)
  51             err = json.Unmarshal(data[1], newevent)
  52             category = "door"
  53             event = *newevent
  54         case "DoorProblemEvent":
  55             newevent := new(DoorProblemEvent)
  56             err = json.Unmarshal(data[1], newevent)
  57             category = "door"
  58             event = *newevent
  59         case "BoreDoomButtonPressEvent":
  60             newevent := new(BoreDoomButtonPressEvent)
  61             err = json.Unmarshal(data[1], newevent)
  62             category = "buttons"
  63             event = *newevent
  64         case "TempSensorUpdate":
  65             newevent := new(TempSensorUpdate)
  66             err = json.Unmarshal(data[1], newevent)
  67             category = "sensors"
  68             event = *newevent
  69         case "IlluminationSensorUpdate":
  70             newevent := new(IlluminationSensorUpdate)
  71             err = json.Unmarshal(data[1], newevent)
  72             category = "sensors"
  73             event = *newevent
  74         case "DustSensorUpdate":
  75             newevent := new(DustSensorUpdate)
  76             err = json.Unmarshal(data[1], newevent)
  77             category = "sensors"
  78             event = *newevent
  79         case "RelativeHumiditySensorUpdate":
  80             newevent := new(RelativeHumiditySensorUpdate)
  81             err = json.Unmarshal(data[1], newevent)
  82             category = "sensors"
  83             event = *newevent
  84         case "TimeTick":
  85             newevent := new(TimeTick)
  86             err = json.Unmarshal(data[1], newevent)
  87             category = "time"
  88             event = *newevent
  89         case "MovementSensorUpdate":
  90             newevent := new(MovementSensorUpdate)
  91             err = json.Unmarshal(data[1], newevent)
  92             category = "movement"
  93             event = *newevent
  94         case "PresenceUpdate":
  95             newevent := new(PresenceUpdate)
  96             err = json.Unmarshal(data[1], newevent)
  97             category = "presence"
  98             event = *newevent
  99         case "SomethingReallyIsMoving":
 100             newevent := new(SomethingReallyIsMoving)
 101             err = json.Unmarshal(data[1], newevent)
 102             category = "movement"
 103             event = *newevent
 104         case "TempSensorSpike":
 105             newevent := new(TempSensorSpike)
 106             err = json.Unmarshal(data[1], newevent)
 107             category = "sensors"
 108             event = *newevent
 109         case "DustSensorSpike":
 110             newevent := new(DustSensorSpike)
 111             err = json.Unmarshal(data[1], newevent)
 112             category = "sensors"
 113             event = *newevent
 114         case "NetDHCPACK":
 115             newevent := new(NetDHCPACK)
 116             err = json.Unmarshal(data[1], newevent)
 117             category = "network"
 118             event = *newevent
 119         case "NetGWStatUpdate":
 120             newevent := new(NetGWStatUpdate)
 121             err = json.Unmarshal(data[1], newevent)
 122             category = "network"
 123             event = *newevent
 124         default:
 125             event = nil
 126             err = errors.New("cannot unmarshal unknown type")
 127             category = ""
 128     }
 129     return
 130 }