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

[peterhellberg]

After b6f418b1fe5af0386c81f387227f36d4801883b0 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 b6f418b1fe5af0386c81f387227f36d4801883b0 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

```go 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{ 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x40, 0x08, 0x03, 0x00, 0x00, 0x00, 0x9d, 0xb7, 0x81, 0xec, 0x00, 0x00, 0x02, 0x2b, 0x50, 0x4c, 0x54, 0x45, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 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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