Only allow OnChange() to be called once

pkg/player/player.go

@@ -2,6 +2,7 @@ package player
 
 import (
 	"strings"
+	"sync"
 
 	"github.com/godbus/dbus/v5"
 	"go.arsenm.dev/infinitime/internal/utils"
@@ -10,6 +11,7 @@ import (
 var (
 	method, monitor *dbus.Conn
 	monitorCh       chan *dbus.Message
+	onChangeOnce    sync.Once
 )
 
 // Init makes required connections to DBis and
@@ -130,7 +132,7 @@ func (ct ChangeType) String() string {
 
 // OnChange runs cb when a value changes
 func OnChange(cb func(ChangeType, string)) {
-	go func() {
+	go onChangeOnce.Do(func() {
 		// For every message on channel
 		for msg := range monitorCh {
 			// Parse PropertiesChanged
@@ -175,7 +177,7 @@ func OnChange(cb func(ChangeType, string)) {
 				}
 			}
 		}
-	}()
+	})
 }
 
 // getPlayerNames gets all DBus MPRIS player bus names