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lightcontrol.go
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lightcontrol.go
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package main
import (
"fmt"
"net/http"
"os"
"go.bug.st/serial"
)
const portName = "/dev/ttyAMA1"
const initCmd = "0xfa1"
const motionCmd = "0xb6a"
const onCmd = "0xbb9"
const offCmd = "0xbba"
type kkSwitch struct {
name string
state bool
statePath string
}
var lightSwitch = kkSwitch{
name: "light",
state: false,
statePath: "/mnt/mtd/ipc/light.state",
}
var motionSwitch = kkSwitch{
name: "motion",
state: false,
statePath: "/mnt/mtd/ipc/motion.state",
}
var relay serial.Port
func sendCmd(cmd string) error {
n, err := relay.Write([]byte(cmd))
if err != nil {
return err
}
if n != len(cmd) {
return fmt.Errorf("only wrote %d of %d bytes", n, len(cmd))
}
return nil
}
func makeState(isOn bool) string {
if isOn {
return "on"
} else {
return "off"
}
}
func updateRelay() error {
if lightSwitch.state {
return sendCmd(onCmd)
} else if motionSwitch.state {
return sendCmd(motionCmd)
} else {
return sendCmd(offCmd)
}
}
func (s *kkSwitch) writeState() error {
data := []byte(makeState(s.state))
return os.WriteFile(s.statePath, data, 0644)
}
func (s *kkSwitch) initState() {
rawState, err := os.ReadFile(s.statePath)
if os.IsNotExist(err) {
err = s.writeState()
if err != nil {
panic(err)
}
} else {
if string(rawState) == "on" {
s.state = true
} else {
s.state = false
}
}
}
func (s *kkSwitch) handleRequest(w http.ResponseWriter, req *http.Request) {
setValue := req.URL.Query().Get("set")
if len(setValue) > 0 {
s.handleSet(w, setValue)
return
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
w.Write([]byte(fmt.Sprintf("{\"state\":\"%s\"}", makeState(s.state))))
}
func (s *kkSwitch) handleSet(w http.ResponseWriter, value string) {
var newState bool
var err error
switch value {
case "on":
newState = true
case "off":
newState = false
case "toggle":
newState = !s.state
default:
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("I don't know how to do that"))
return
}
if newState != s.state {
s.state = newState
err = updateRelay()
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return
}
err = s.writeState()
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return
}
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
w.Write([]byte(fmt.Sprintf("{\"ok\":true,\"state\":\"%s\"}", makeState(s.state))))
}
func main() {
var err error
mode := &serial.Mode{BaudRate: 9600, Parity: serial.NoParity, StopBits: serial.OneStopBit}
relay, err = serial.Open(portName, mode)
if err != nil {
panic(err)
}
err = sendCmd(initCmd)
if err != nil {
panic(err)
}
lightSwitch.initState()
motionSwitch.initState()
err = updateRelay()
if err != nil {
panic(err)
}
http.HandleFunc("/light", lightSwitch.handleRequest)
http.HandleFunc("/motion", motionSwitch.handleRequest)
err = http.ListenAndServe(":8090", nil)
if err != nil {
panic(err)
}
}