Improve logging

main.go

@@ -26,6 +26,8 @@ var keyUrl = map[uint16]string{
 	B_5: "http://atreides:5051/to/rake",
 }
 
+var showGrabFailMsg = true
+
 func getAndGrab() (keydev *evdev.InputDevice) {
 	devices, _ := evdev.ListInputDevices("/dev/input/event*")
 	for _, dev := range devices {
@@ -38,9 +40,14 @@ func getAndGrab() (keydev *evdev.InputDevice) {
 	}
 	err := keydev.Grab()
 	if err != nil {
+		if showGrabFailMsg {
+			log.Print("found the device but failed to grab it")
+			showGrabFailMsg = false
+		}
 		return nil
 	}
 	log.Println("grabbed the device")
+	showGrabFailMsg = true
 	return
 }
 
@@ -49,9 +56,10 @@ func handle_event(ev *evdev.InputEvent) {
 		return
 	}
 	if ev.Code < B_1 || ev.Code > B_5 {
-		log.Print("unknown key", ev.Code)
+		log.Print("ignoring unknown key", ev.Code)
 		return
 	}
+	log.Printf("received code %d, hitting %s", ev.Code, keyUrl[ev.Code])
 	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)
@@ -59,6 +67,10 @@ func handle_event(ev *evdev.InputEvent) {
 	}
 	defer resp.Body.Close()
 	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		log.Print("error reading response:", err)
+		return
+	}
 	log.Print("output:\n", string(body))
 }