Persist volume level on player

src/commands/volume.ts

@@ -31,7 +31,7 @@ export default class implements Command {
     const player = this.playerManager.get(interaction.guild!.id);
 
     if (!player.canControlVolume()) {
-      throw new Error('Ope, sorry but I\'m not configured to allow volume control! You can enable it by starting the bot with env VOLUME_CONTROL=true');
+      throw new Error('sorry but I\'m not configured to allow volume control! You can enable it by starting the bot with env VOLUME_CONTROL=true');
     }
 
     const currentSong = player.getCurrent();

src/services/player.ts

@@ -69,6 +69,7 @@ export default class {
   private queuePosition = 0;
   private audioPlayer: AudioPlayer | null = null;
   private audioResource: AudioResource | null = null;
+  private volume = 100;
   private nowPlaying: QueuedSong | null = null;
   private playPositionInterval: NodeJS.Timeout | undefined;
   private lastSongURL = '';
@@ -406,15 +407,16 @@ export default class {
   setVolume(level: number): void {
     // Level should be a number between 0 and 100 = 0% => 100%
     // Spotify expects a float between 0 and 1 to represent this percentage
-    this.audioResource?.volume?.setVolume(level / 100);
+    this.volume = level;
+    this.audioResource?.volume?.setVolume(this.volume / 100);
   }
 
   getVolume(): number | undefined {
     if (!this.volumeControl || this.audioResource === null || this.audioResource.volume === undefined) {
       return undefined;
     }
 
-    return this.audioResource.volume.volume * 100;
+    return this.volume;
   }
 
   canControlVolume(): boolean {
@@ -626,6 +628,7 @@ export default class {
   private playAudioPlayerResource(resource: AudioResource) {
     if (this.audioPlayer !== null) {
       this.audioResource = resource;
+      this.audioResource?.volume?.setVolume(this.volume / 100);
       this.audioPlayer.play(resource);
     }
   }