83 lines
1.5 KiB
Go
83 lines
1.5 KiB
Go
package main
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import (
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"context"
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"fmt"
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"log"
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"net/http"
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"os"
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"os/signal"
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"sync"
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"syscall"
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"time"
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"github.com/warthog618/gpiod"
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"github.com/warthog618/gpiod/device/rpi"
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)
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var ledState = 1
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var ledLine *gpiod.Line
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var ledMutex = &sync.Mutex{}
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func main() {
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chip := setupGpio()
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defer chip.Close()
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defer cleanupLedLine(ledLine)
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startServer()
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}
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func setupGpio() (c *gpiod.Chip) {
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c, err := gpiod.NewChip("gpiochip0")
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if err != nil {
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panic(err)
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}
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led := rpi.J8p7
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ledLine, err = c.RequestLine(led, gpiod.AsOutput(ledState))
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if err != nil {
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panic(err)
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}
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return
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}
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func cleanupLedLine(line *gpiod.Line) {
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log.Println("Reverting pin to input")
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line.Reconfigure(gpiod.AsInput)
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line.Close()
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}
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func startServer() {
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mux := http.NewServeMux()
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mux.HandleFunc("/", toggleLed)
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server := &http.Server{Addr: ":4000", Handler: mux}
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// Setting up signal capturing
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stop := make(chan os.Signal, 1)
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signal.Notify(stop, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
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go func() {
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if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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log.Fatalf("listen: %s\n", err)
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}
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}()
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log.Print("Server Started")
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<-stop
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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if err := server.Shutdown(ctx); err != nil {
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log.Fatalf("Error during shutdown: %+v", err)
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}
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}
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func toggleLed(w http.ResponseWriter, r *http.Request) {
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ledMutex.Lock()
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ledState ^= 1
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ledLine.SetValue(ledState)
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ledMutex.Unlock()
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log.Println("Toggle led")
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w.WriteHeader(200)
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fmt.Fprintln(w, "Toggling led")
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}
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