Add auto disconnect

src/bot.ts

@@ -2,9 +2,10 @@ import {Client, Message, Collection} from 'discord.js';
 import {inject, injectable} from 'inversify';
 import {TYPES} from './types';
 import {Settings, Shortcut} from './models';
-import handleGuildCreate from './events/guild-create';
 import container from './inversify.config';
 import Command from './commands';
+import handleGuildCreate from './events/guild-create';
+import handleVoiceStateUpdate from './events/voice-state-update';
 
 @injectable()
 export default class {
@@ -87,12 +88,11 @@ export default class {
       console.log(`Ready! Invite the bot with https://discordapp.com/oauth2/authorize?client_id=${this.clientId}&scope=bot`);
     });
 
-    this.client.on('error', error => {
-      console.error(error);
-    });
+    this.client.on('error', console.error);
 
     // Register event handlers
     this.client.on('guildCreate', handleGuildCreate);
+    this.client.on('voiceStateUpdate', handleVoiceStateUpdate);
 
     return this.client.login(this.token);
   }

src/commands/play.ts

@@ -36,6 +36,13 @@ export default class implements Command {
   }
 
   public async execute(msg: Message, args: string []): Promise<void> {
+    const [targetVoiceChannel, nInChannel] = getMostPopularVoiceChannel(msg.guild!);
+
+    if (nInChannel === 0) {
+      await msg.channel.send('error: all voice channels are empty');
+      return;
+    }
+
     const queue = this.queueManager.get(msg.guild!.id);
 
     if (args.length === 0) {
@@ -50,9 +57,7 @@ export default class implements Command {
         return;
       }
 
-      const channel = getMostPopularVoiceChannel(msg.guild!);
-
-      await this.playerManager.get(msg.guild!.id).connect(channel);
+      await this.playerManager.get(msg.guild!.id).connect(targetVoiceChannel);
       await this.playerManager.get(msg.guild!.id).play();
 
       await msg.channel.send('play resuming');
@@ -252,9 +257,7 @@ export default class implements Command {
     await res.stop('song(s) queued');
 
     if (this.playerManager.get(msg.guild!.id).status === STATUS.DISCONNECTED) {
-      const channel = getMostPopularVoiceChannel(msg.guild!);
-
-      await this.playerManager.get(msg.guild!.id).connect(channel);
+      await this.playerManager.get(msg.guild!.id).connect(targetVoiceChannel);
 
       await this.playerManager.get(msg.guild!.id).play();
     }

src/events/voice-state-update.ts

@@ -0,0 +1,17 @@
+import {VoiceState} from 'discord.js';
+import container from '../inversify.config';
+import {TYPES} from '../types';
+import PlayerManager from '../managers/player';
+import {getSizeWithoutBots} from '../utils/channels';
+
+export default (oldState: VoiceState, _: VoiceState): void => {
+  const playerManager = container.get<PlayerManager>(TYPES.Managers.Player);
+
+  const player = playerManager.get(oldState.guild.id);
+
+  if (player.voiceConnection) {
+    if (getSizeWithoutBots(player.voiceConnection.channel) === 0) {
+      player.disconnect();
+    }
+  }
+};

src/services/player.ts

@@ -16,9 +16,9 @@ export enum STATUS {
 
 export default class {
   public status = STATUS.DISCONNECTED;
+  public voiceConnection: VoiceConnection | null = null;
   private readonly queue: Queue;
   private readonly cacheDir: string;
-  private voiceConnection: VoiceConnection | null = null;
   private dispatcher: StreamDispatcher | null = null;
   private playPositionInterval: NodeJS.Timeout | undefined;
 

src/utils/channels.ts

@@ -1,6 +1,14 @@
 import {Guild, VoiceChannel} from 'discord.js';
 
-export const getMostPopularVoiceChannel = (guild: Guild, min = 0): VoiceChannel => {
+export const getSizeWithoutBots = (channel: VoiceChannel): number => channel.members.array().reduce((s, member) => {
+  if (!member.user.bot) {
+    s++;
+  }
+
+  return s;
+}, 0);
+
+export const getMostPopularVoiceChannel = (guild: Guild): [VoiceChannel, number] => {
   interface PopularResult {
     n: number;
     channel: VoiceChannel | null;
@@ -9,18 +17,16 @@ export const getMostPopularVoiceChannel = (guild: Guild, min = 0): VoiceChannel
   const voiceChannels: PopularResult[] = [];
 
   for (const [_, channel] of guild.channels.cache) {
-    if (channel.type === 'voice' && channel.members.size >= min) {
+    if (channel.type === 'voice') {
+      const size = getSizeWithoutBots(channel as VoiceChannel);
+
       voiceChannels.push({
         channel: channel as VoiceChannel,
-        n: channel.members.size
+        n: size
       });
     }
   }
 
-  if (voiceChannels.length === 0) {
-    throw new Error('No voice channels meet minimum size');
-  }
-
   // Find most popular channel
   const popularChannel = voiceChannels.reduce((popular: PopularResult, elem: PopularResult) => {
     if (elem.n > popular.n) {
@@ -31,7 +37,7 @@ export const getMostPopularVoiceChannel = (guild: Guild, min = 0): VoiceChannel
   }, {n: -1, channel: null});
 
   if (popularChannel.channel) {
-    return popularChannel.channel;
+    return [popularChannel.channel, popularChannel.n];
   }
 
   throw new Error();