Initial commit

.gitignore

@@ -0,0 +1 @@
+/kvmkey

go.mod

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+module gitea.elkins.co/joel/kvmkey
+
+go 1.19
+
+require github.com/gvalkov/golang-evdev v0.0.0-20220815104727-7e27d6ce89b6 // indirect

go.sum

@@ -0,0 +1,2 @@
+github.com/gvalkov/golang-evdev v0.0.0-20220815104727-7e27d6ce89b6 h1:K9b8efT9f1NkITNgNAm2A1LuoamhG4pAhXVjz5Sfa5Q=
+github.com/gvalkov/golang-evdev v0.0.0-20220815104727-7e27d6ce89b6/go.mod h1:SAzVFKCRezozJTGavF3GX8MBUruETCqzivVLYiywouA=

main.go

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+package main
+
+import (
+	"io"
+	"log"
+	"net/http"
+	"time"
+
+	evdev "github.com/gvalkov/golang-evdev"
+)
+
+const devname = "Drop The Key"
+const (
+	B_1 uint16 = 59 + iota
+	B_2
+	B_3
+	B_4
+	B_5
+)
+
+var keyUrl = map[uint16]string{
+	B_1: "http://atreides:5051/fromcur",
+	B_2: "http://atreides:5051/fromcurto/hoke",
+	B_3: "http://atreides:5051/fromcurto/rake",
+	B_4: "http://atreides:5051/to/hoke",
+	B_5: "http://atreides:5051/to/rake",
+}
+
+func getAndGrab() (keydev *evdev.InputDevice) {
+	devices, _ := evdev.ListInputDevices("/dev/input/event*")
+	for _, dev := range devices {
+		if dev.Name == devname {
+			keydev = dev
+		}
+	}
+	if keydev == nil {
+		return
+	}
+	err := keydev.Grab()
+	if err != nil {
+		return nil
+	}
+	log.Println("grabbed the device")
+	return
+}
+
+func handle_event(ev *evdev.InputEvent) {
+	if ev.Type != evdev.EV_KEY || ev.Value != 0 {
+		return
+	}
+	if ev.Code < B_1 || ev.Code > B_5 {
+		log.Print("unknown key", ev.Code)
+		return
+	}
+	resp, err := http.Get(keyUrl[ev.Code])
+	if err != nil {
+		log.Printf("error processing key %d (url %s): %s", ev.Code, keyUrl[ev.Code], err)
+		return
+	}
+	defer resp.Body.Close()
+	body, err := io.ReadAll(resp.Body)
+	log.Print("output:\n", string(body))
+}
+
+func monitorForever(dev *evdev.InputDevice) {
+	for {
+		events, err := dev.Read()
+		if err != nil {
+			return
+		}
+		for i := range events {
+			go handle_event(&events[i])
+		}
+	}
+}
+
+func main() {
+	for {
+		keydev := getAndGrab()
+		if keydev == nil {
+			time.Sleep(5 * time.Second)
+		} else {
+			monitorForever(keydev)
+			log.Println("lost the device")
+		}
+	}
+}