go/door_daemon_zmq/handle_commands.go

   1 // (c) Bernhard Tittelbach, 2013
   2
   3 package main
   4
   5 import (
   6         "errors"
   7         "time"
   8 )
   9
  10 type DoorCmdHandler struct {
  11         Checker      func([][]byte) error
  12         FirmwareChar string
  13 }
  14
  15 var cmdToDoorCmdHandler = map[string]DoorCmdHandler{
  16         "open":   DoorCmdHandler{checkCmdDoorControl, "o"},
  17         "close":  DoorCmdHandler{checkCmdDoorControl, "c"},
  18         "toggle": DoorCmdHandler{checkCmdDoorControl, "t"},
  19         "status": DoorCmdHandler{checkCmdNoArgs, "s"},
  20 }
  21
  22 // ---------- Talk with Firmware directly in response to stuff it sends ------------
  23
  24 func WorkaroundFirmware(serial_wr chan string) (in chan [][]byte) {
  25         in = make(chan [][]byte, 5)
  26         go func() {
  27                 var last_state_time time.Time
  28                 var last_door_state string
  29                 for firmware_output := range in {
  30                         Debug_.Printf("WorkaroundFirmware Input: %s", firmware_output)
  31                         if len(firmware_output) > 1 && string(firmware_output[0]) == "State:" {
  32                                 last_state_time = time.Now()
  33                                 last_door_state = string(firmware_output[1])
  34                         }
  35                         if len(firmware_output) == 5 &&
  36                                 string(firmware_output[0]) == "Info(ajar):" &&
  37                                 string(firmware_output[4]) == "ajar" &&
  38                                 time.Now().Sub(last_state_time) < 30*time.Second &&
  39                                 last_door_state == "timeout_after_open" {
  40                                 //If we were in state "timeout_after_open" and within 30s the door was openend anyway,
  41                                 //we send another "open" command
  42                                 serial_wr <- cmdToDoorCmdHandler["open"].FirmwareChar
  43                                 Syslog_.Print("Telling Firmware to open, since door was ajar'ed after timeout_after_open")
  44                         }
  45                 }
  46         }()
  47         return in
  48 }
  49
  50 // ---------- ZMQ Command Handling Code -------------
  51
  52 func checkCmdDoorControl(tokens [][]byte) error {
  53         doorctrl_usage := "syntax: <open|close|toggle> <method> <nickname>"
  54         if len(tokens) < 2 || len(tokens) > 3 {
  55                 return errors.New(doorctrl_usage)
  56         }
  57         cmd := string(tokens[0])
  58         if !(cmd == "open" || cmd == "close" || cmd == "toggle") {
  59                 return errors.New(doorctrl_usage)
  60         }
  61         method := string(tokens[1])
  62         if !(method == "Button" || method == "ssh" || method == "SSH" || method == "Phone") {
  63                 return errors.New("method must be one either Button, SSH or Phone")
  64         }
  65         if (len(tokens) == 2 || len(tokens[2]) == 0) && method != "Button" {
  66                 return errors.New("Operator nickname must be given")
  67         }
  68         return nil
  69 }
  70
  71 func checkCmdNoArgs(tokens [][]byte) error {
  72         if len(tokens) != 1 {
  73                 return errors.New("command does not accept arguments")
  74         }
  75         return nil
  76 }
  77
  78 func HandleCommand(tokens [][]byte, serial_wr chan string, serial_rd chan [][]byte) error {
  79         if len(tokens) < 1 {
  80                 return errors.New("No Command to handle")
  81         }
  82
  83         dch, present := cmdToDoorCmdHandler[string(tokens[0])]
  84         if !present {
  85                 return errors.New("Unknown Command")
  86         }
  87
  88         if err := dch.Checker(tokens); err != nil {
  89                 return err
  90         }
  91
  92         serial_wr <- dch.FirmwareChar
  93         return nil
  94 }