Can not open input device on Raspberry Pi 3B+ anymore

[peterhellberg]

After b6f418b there was some change that broke the usage of golang-evdev on my Raspberry Pi 3B+ running balenaOS. (With resin/scratch containers built with balenalib/raspberrypi3-alpine-golang)

In the latest version of this package the input device list is empty
([]*evdev.InputDevice{}) and /dev/input/event0 doesn’t exist.

For now my workaround is to lock the version of this package to b6f418b but just wanted to give you a heads up.

(I’m using this package in combination with https://github.com/nathany/bobblehat on a RPi connected to a SenseHAT)

[maitredede]

Hi, can you give a try to : https://github.com/MaitreDede/golang-evdev/tree/err-checks ?

go get -v github.com/MaitreDede/golang-evdev@err-checks

[peterhellberg]

@maitredede Yes, your fork/branch seems to work as it should.

Got my RPi accessible via: https://6ea712a77b3b247831fcc102c606a54a.balena-devices.com/

Currently running code

package main

import (
	"context"
	"encoding/json"
	"flag"
	"fmt"
	"image/png"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"os/signal"
	"time"

	evdev "github.com/MaitreDede/golang-evdev"
	ble "github.com/go-ble/ble"
	dev "github.com/go-ble/ble/examples/lib/dev"
	screen "github.com/nathany/bobblehat/sense/screen"
	color "github.com/nathany/bobblehat/sense/screen/color"
	ruuvitag "github.com/peterhellberg/ruuvitag"
)

var (
	rawData     = map[string]timestampedRAWv1{}
	framebuffer = screen.NewFrameBuffer()
)

type timestampedRAWv1 struct {
	ruuvitag.RAWv1
	Time time.Time
}

func clear() {
	framebuffer = screen.NewFrameBuffer()

	// Clear the Sense HAT screen
	screen.Clear()
}

func main() {
	var path string

	flag.StringVar(&path, "path", "/dev/input/event0", "path to the event device")

	flag.Parse()

	clear()

	// Setup the logger
	logger := log.New(os.Stdout, "", 0)

	handleSignals(logger)

	hs := setup(logger)

	device, err := openInputDevice(path)
	if err != nil {
		logger.Printf("Unable to open input device: %s\nError: %v\n", path, err)
		os.Exit(1)
	}

	logger.Println(device)

	go hs.ListenAndServe()
	go bleScan(context.Background(), logger)

	for {
		events, err := device.Read()
		if err != nil {
			fmt.Printf("device.Read() Error: %v\n", err)
			os.Exit(1)
		}

		for _, ev := range events {
			switch ev.Type {
			case evdev.EV_KEY:
				ke := evdev.NewKeyEvent(&ev)

				if ke.State != evdev.KeyDown {
					continue
				}

				// Create a new framebuffer
				fb := screen.NewFrameBuffer()

				switch ke.Scancode {
				case evdev.KEY_ENTER:
					fmt.Println("⏎ ")
				case evdev.KEY_UP:
					fmt.Println("↑")
					draw(fb, 0, 0, 8, 4, color.New(255, 255, 0))
				case evdev.KEY_DOWN:
					fmt.Println("↓")
					draw(fb, 0, 4, 8, 8, color.New(255, 0, 0))
				case evdev.KEY_LEFT:
					fmt.Println("←")
					draw(fb, 0, 0, 4, 8, color.New(0, 0, 255))
				case evdev.KEY_RIGHT:
					fmt.Println("→")
					draw(fb, 4, 0, 8, 8, color.New(0, 255, 0))
				}

				framebuffer = fb

				screen.Draw(fb)
			}
		}
	}
}

func openInputDevice(path string) (*evdev.InputDevice, error) {
	if !evdev.IsInputDevice(path) {
		return nil, fmt.Errorf("not an input device")
	}

	return evdev.Open(path)
}

func handleSignals(logger *log.Logger) {
	c := make(chan os.Signal, 1)

	signal.Notify(c, os.Interrupt)

	go func() {
		for range c {
			logger.Println("Clearing the screen...")
			clear()
			os.Exit(0)
		}
	}()
}

func bleScan(ctx context.Context, logger *log.Logger) {
	d, err := dev.DefaultDevice()
	if err != nil {
		logger.Printf("DefaultDevice error: %v\n", err)

		return
	}

	ble.SetDefaultDevice(d)

	handler := func(a ble.Advertisement) {
		raw, err := ruuvitag.ParseRAWv1(a.ManufacturerData())
		if err == nil {
			rawData[a.Addr().String()] = timestampedRAWv1{raw, time.Now()}
		}
	}

	ctx = ble.WithSigHandler(context.WithCancel(ctx))

	ble.Scan(ctx, true, handler, func(a ble.Advertisement) bool {
		return ruuvitag.IsRAWv1(a.ManufacturerData())
	})
}

func draw(fb *screen.FrameBuffer, a, b, m, n int, c color.Color) {
	for i := a; i < m; i++ {
		for j := b; j < n; j++ {
			fb.SetPixel(i, j, c)
		}
	}
}

func setup(logger *log.Logger) *http.Server {
	return &http.Server{
		Addr:         getAddr(),
		Handler:      newServer(logWith(logger)),
		ReadTimeout:  5 * time.Second,
		WriteTimeout: 10 * time.Second,
		IdleTimeout:  60 * time.Second,
	}
}

func getAddr() string {
	if port := os.Getenv("PORT"); port != "" {
		return ":" + port
	}

	return ":80"
}

func newServer(options ...Option) *Server {
	s := &Server{logger: log.New(ioutil.Discard, "", 0)}

	for _, o := range options {
		o(s)
	}

	s.mux = http.NewServeMux()
	s.mux.HandleFunc("/", s.index)
	s.mux.HandleFunc("/framebuffer.png", s.framebuffer)
	s.mux.HandleFunc("/favicon.ico", s.favicon)

	return s
}

type Option func(*Server)

func logWith(logger *log.Logger) Option {
	return func(s *Server) {
		s.logger = logger
	}
}

type Server struct {
	mux    *http.ServeMux
	logger *log.Logger
}

func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	if r.Method != "GET" {
		w.WriteHeader(http.StatusMethodNotAllowed)
		return
	}

	s.log("%s %s", r.Method, r.URL.Path)

	s.mux.ServeHTTP(w, r)
}

func (s *Server) log(format string, v ...interface{}) {
	s.logger.Printf(format+"\n", v...)
}

func (s *Server) index(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json; charset=utf-8")

	json.NewEncoder(w).Encode(map[string]interface{}{
		"ruuvitags": rawData,
	})
}

func (s *Server) framebuffer(w http.ResponseWriter, r *http.Request) {
	if framebuffer == nil {
		w.WriteHeader(http.StatusNoContent)
		return
	}

	png.Encode(w, framebuffer)
}

func (s *Server) favicon(w http.ResponseWriter, r *http.Request) {
	w.Write(faviconData)
}

var faviconData = []byte{
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}

[peterhellberg]

@gvalkov Should I close this issue, or do you want to incorporate the changes made in https://github.com/MaitreDede/golang-evdev/tree/err-checks?

[maitredede]

Hi, I made a pull request : #17