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package main
import (
"encoding/json"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"os/exec"
"strconv"
"strings"
)
type Configuration struct {
Listen string
Vcp string
}
var configuration = Configuration{
Listen: "127.0.0.1:49281",
Vcp: "10"}
type Brightness struct {
Lock bool
Value int
ToggledValue int
}
var currentBrightness Brightness
func update() {
if currentBrightness.Lock == false {
currentBrightness.Lock = true
cmd := exec.Command("ddcutil", "getvcp", "--brief", configuration.Vcp)
log.Println(cmd.String())
out, err := cmd.CombinedOutput()
if err != nil {
log.Println(err)
return
}
outString := strings.Split(strings.Trim(string(out), "\n"), " ")
currentBrightness.Value, err = strconv.Atoi(outString[len(outString)-2])
if err != nil {
log.Println(err)
return
}
log.Println("Current brightness is", currentBrightness.Value)
currentBrightness.Lock = false
} else {
log.Println("Active lock, no operation performed")
return
}
}
func get(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
log.Println("Current brightness cached value is",
currentBrightness.Value)
}
}
func ddcutilSetBrightness(brightness Brightness) {
if currentBrightness.Lock == false {
currentBrightness.Lock = true
cmd := exec.Command("ddcutil", "setvcp", configuration.Vcp,
strconv.Itoa(brightness.Value))
log.Println(cmd.String())
_, err := cmd.CombinedOutput()
if err != nil {
log.Println(err)
return
}
currentBrightness.Value = brightness.Value
currentBrightness.Lock = false
} else {
log.Println("Active lock, no operation performed")
return
}
}
func set(w http.ResponseWriter, r *http.Request) {
if r.Method == "POST" {
body, err := io.ReadAll(r.Body)
if err != nil {
log.Println(err)
return
}
var brightness Brightness
json.Unmarshal([]byte(body), &brightness)
ddcutilSetBrightness(brightness)
}
}
func decrease(w http.ResponseWriter, r *http.Request) {
if r.Method == "POST" {
body, err := io.ReadAll(r.Body)
if err != nil {
log.Println(err)
return
}
var brightness Brightness
json.Unmarshal([]byte(body), &brightness)
newValue := Brightness{Value: currentBrightness.Value - brightness.Value}
if newValue.Value < 0 {
log.Println("Brightness is minimum")
} else {
ddcutilSetBrightness(newValue)
log.Println("Current brightness is", currentBrightness.Value)
}
} else {
log.Println("Active lock, no operation performed")
return
}
}
func increase(w http.ResponseWriter, r *http.Request) {
if r.Method == "POST" {
body, err := io.ReadAll(r.Body)
if err != nil {
log.Println(err)
return
}
var brightness Brightness
json.Unmarshal([]byte(body), &brightness)
newValue := Brightness{Value: currentBrightness.Value + brightness.Value}
if newValue.Value > 100 {
log.Println("Brightness is maximum")
} else {
ddcutilSetBrightness(newValue)
log.Println("Current brightness is", currentBrightness.Value)
}
} else {
log.Println("Active lock, no operation performed")
return
}
}
func toggle(w http.ResponseWriter, r *http.Request) {
if r.Method == "POST" {
if currentBrightness.Value == 0 {
ddcutilSetBrightness(Brightness{Value: currentBrightness.ToggledValue})
log.Println("Current brightness is", currentBrightness.Value)
} else {
currentBrightness.ToggledValue = currentBrightness.Value
ddcutilSetBrightness(Brightness{Value: 0})
log.Println("Current brightness is", currentBrightness.Value)
}
}
}
func main() {
jsonFile, err := os.Open(os.Args[1])
if err != nil {
log.Fatalln(err)
}
byteValue, err := ioutil.ReadAll(jsonFile)
if err != nil {
log.Fatalln(err)
}
var configuration Configuration
json.Unmarshal(byteValue, &configuration)
jsonFile.Close()
currentBrightness.Lock = false
update()
http.HandleFunc("/update", func(w http.ResponseWriter, r *http.Request) {
update()
})
http.HandleFunc("/get", get)
http.HandleFunc("/set", set)
http.HandleFunc("/decrease", decrease)
http.HandleFunc("/increase", increase)
http.HandleFunc("/toggle", toggle)
log.Fatal(http.ListenAndServe(configuration.Listen, nil))
}
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