122 lines
3.3 KiB
Go
122 lines
3.3 KiB
Go
//go:build linux
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package native
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import (
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"context"
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"fmt"
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"slices"
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"strings"
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"sync"
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"github.com/evcc-io/evcc/util"
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"github.com/holoplot/go-evdev"
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)
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type RfIdContainer struct {
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mu sync.Mutex
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rfId string
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}
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func (c *RfIdContainer) Set(rfId string) {
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c.mu.Lock()
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defer c.mu.Unlock()
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c.rfId = rfId
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}
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func (c *RfIdContainer) Get() string {
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c.mu.Lock()
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defer c.mu.Unlock()
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return c.rfId
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}
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// NewRFIDHandler initializes RFID device monitoring.
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// It starts goroutines that monitor RFID devices and update the rfIdContainer.
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// Monitoring stops when the context is cancelled.
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func NewRFIDHandler(rfIdVidPid string, ctx context.Context, rfIdContainer *RfIdContainer, log *util.Logger) error {
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devicePaths, err := evdev.ListDevicePaths()
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if err != nil {
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return fmt.Errorf("cannot list device paths: %w", err)
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}
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var keyboardPaths []string
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for _, d := range devicePaths {
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log.DEBUG.Printf("Device path: %s | Name: %s\n", d.Path, d.Name)
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dev, err := evdev.Open(d.Path)
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if err != nil {
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log.WARN.Printf("Cannot read %s: %v\n", d.Path, err)
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continue
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}
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inputId, err := dev.InputID()
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if err != nil {
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log.WARN.Printf("Cannot get InputID for %s: %s", d.Path, err)
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continue
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}
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if fmt.Sprintf("%x:%x", inputId.Vendor, inputId.Product) == rfIdVidPid {
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log.DEBUG.Printf("found input device which matches VID:PID %s", rfIdVidPid)
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events := dev.CapableEvents(evdev.EV_KEY)
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if slices.Contains(events, evdev.KEY_ENTER) {
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log.DEBUG.Println("detected 'enter' key, device seems to be a keyboard")
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keyboardPaths = append(keyboardPaths, d.Path)
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} else {
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log.DEBUG.Println("no 'enter' key detected, skipping device")
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}
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}
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}
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for _, p := range keyboardPaths {
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go monitorKeyboardRFID(ctx, p, log, rfIdContainer)
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}
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return nil
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}
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// monitorKeyboardRFID listens for RFID input events from the specified device path `p`
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// and sends complete RFID reads to the `rfIdChannel` channel.
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// It stops when the context is cancelled and signals completion via the WaitGroup.
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func monitorKeyboardRFID(ctx context.Context, p string, log *util.Logger, rfIdContainer *RfIdContainer) {
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dev, err := evdev.Open(p)
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if err != nil {
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log.ERROR.Printf("Cannot read %s: %v\n", p, err)
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return
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}
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var builder strings.Builder
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for {
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select {
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case <-ctx.Done():
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return
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default:
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e, err := dev.ReadOne()
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if err != nil {
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log.ERROR.Printf("Error reading from device: %v\n", err)
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continue
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}
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switch e.Type {
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case evdev.EV_KEY:
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if e.Value == 1 {
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log.DEBUG.Printf("Received keystroke \"%s\"", e.CodeName())
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if e.Code == evdev.KEY_ENTER || e.Code == evdev.KEY_KPENTER {
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log.DEBUG.Printf("Received enter key, setting RFID \"%s\"", builder.String())
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rfIdContainer.Set(builder.String())
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builder.Reset()
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} else {
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if val, ok := convertKeyCodeNameToCharacter(e.CodeName()); ok {
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builder.WriteString(val)
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} else {
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log.WARN.Printf("Unknown key code: %v", e.Code)
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}
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}
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}
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}
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}
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}
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}
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func convertKeyCodeNameToCharacter(s string) (string, bool) {
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if after, found := strings.CutPrefix(s, "KEY_KP"); found && len(after) == 1 { // Events from numeric keypad
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return after, true
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} else if after, found := strings.CutPrefix(s, "KEY_"); found && len(after) == 1 { // Events from regular keys
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return after, true
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}
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return "", false // Unknown key
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}
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