Add config for song limit per playlist

src/commands/play.ts

@@ -10,6 +10,7 @@ import LoadingMessage from '../utils/loading-message.js';
 import errorMsg from '../utils/error-msg.js';
 import Command from '.';
 import GetSongs from '../services/get-songs.js';
+import Config from '../services/config.js';
 
 @injectable()
 export default class implements Command {
@@ -31,10 +32,16 @@ export default class implements Command {
 
   private readonly playerManager: PlayerManager;
   private readonly getSongs: GetSongs;
+  private readonly playlistLimit: number;
 
-  constructor(@inject(TYPES.Managers.Player) playerManager: PlayerManager, @inject(TYPES.Services.GetSongs) getSongs: GetSongs) {
+  constructor(
+  @inject(TYPES.Managers.Player) playerManager: PlayerManager,
+    @inject(TYPES.Services.GetSongs) getSongs: GetSongs,
+    @inject(TYPES.Config) config: Config,
+  ) {
     this.playerManager = playerManager;
     this.getSongs = getSongs;
+    this.playlistLimit = config.getPlaylistLimit();
   }
 
   public async execute(msg: Message, args: string[]): Promise<void> {
@@ -103,11 +110,11 @@ export default class implements Command {
       } else if (url.protocol === 'spotify:' || url.host === 'open.spotify.com') {
         const [convertedSongs, nSongsNotFound, totalSongs] = await this.getSongs.spotifySource(args[0]);
 
-        if (totalSongs > 50) {
-          extraMsg = 'a random sample of 50 songs was taken';
+        if (totalSongs > this.playlistLimit) {
+          extraMsg = `a random sample of ${this.playlistLimit} songs was taken`;
         }
 
-        if (totalSongs > 50 && nSongsNotFound !== 0) {
+        if (totalSongs > this.playlistLimit && nSongsNotFound !== 0) {
           extraMsg += ' and ';
         }
 

src/services/config.ts

@@ -4,6 +4,7 @@ import path from 'path';
 dotenv.config();
 
 export const DATA_DIR = path.resolve(process.env.DATA_DIR ? process.env.DATA_DIR : './data');
+const DEFAULT_PLAYLIST_LIMIT = 50;
 
 const CONFIG_MAP = {
   DISCORD_TOKEN: process.env.DISCORD_TOKEN,
@@ -12,6 +13,7 @@ const CONFIG_MAP = {
   SPOTIFY_CLIENT_SECRET: process.env.SPOTIFY_CLIENT_SECRET,
   DATA_DIR,
   CACHE_DIR: path.join(DATA_DIR, 'cache'),
+  PLAYLIST_LIMIT: process.env.PLAYLIST_LIMIT,
 } as const;
 
 @injectable()
@@ -22,6 +24,7 @@ export default class Config {
   readonly SPOTIFY_CLIENT_SECRET!: string;
   readonly DATA_DIR!: string;
   readonly CACHE_DIR!: string;
+  readonly PLAYLIST_LIMIT!: string;
 
   constructor() {
     for (const [key, value] of Object.entries(CONFIG_MAP)) {
@@ -33,4 +36,12 @@ export default class Config {
       this[key as keyof typeof CONFIG_MAP] = value;
     }
   }
+
+  getPlaylistLimit() {
+    if (!this.PLAYLIST_LIMIT) {
+      return DEFAULT_PLAYLIST_LIMIT;
+    }
+
+    return Number(this.PLAYLIST_LIMIT) || DEFAULT_PLAYLIST_LIMIT;
+  }
 }

src/services/get-songs.ts

@@ -27,6 +27,7 @@ export default class {
   private readonly youtubeKey: string;
   private readonly spotify: Spotify;
   private readonly cache: CacheProvider;
+  private readonly playlistLimit: number;
 
   private readonly ytsrQueue: PQueue;
 
@@ -38,6 +39,7 @@ export default class {
     this.youtubeKey = config.YOUTUBE_API_KEY;
     this.spotify = thirdParty.spotify;
     this.cache = cache;
+    this.playlistLimit = config.getPlaylistLimit();
 
     this.ytsrQueue = new PQueue({concurrency: 4});
   }
@@ -126,7 +128,7 @@ export default class {
       const {items, nextPageToken} = await this.cache.wrap(
         this.youtube.playlists.items,
         listId,
-        {maxResults: '50', pageToken: nextToken},
+        {maxResults: `${this.playlistLimit}`, pageToken: nextToken},
         {
           expiresIn: ONE_MINUTE_IN_SECONDS,
         },
@@ -199,7 +201,7 @@ export default class {
       case 'album': {
         const uri = parsed as spotifyURI.Album;
 
-        const [{body: album}, {body: {items}}] = await Promise.all([this.spotify.getAlbum(uri.id), this.spotify.getAlbumTracks(uri.id, {limit: 50})]);
+        const [{body: album}, {body: {items}}] = await Promise.all([this.spotify.getAlbum(uri.id), this.spotify.getAlbumTracks(uri.id, {limit: this.playlistLimit})]);
 
         tracks.push(...items);
 
@@ -210,7 +212,7 @@ export default class {
       case 'playlist': {
         const uri = parsed as spotifyURI.Playlist;
 
-        let [{body: playlistResponse}, {body: tracksResponse}] = await Promise.all([this.spotify.getPlaylist(uri.id), this.spotify.getPlaylistTracks(uri.id, {limit: 50})]);
+        let [{body: playlistResponse}, {body: tracksResponse}] = await Promise.all([this.spotify.getPlaylist(uri.id), this.spotify.getPlaylistTracks(uri.id, {limit: this.playlistLimit})]);
 
         playlist = {title: playlistResponse.name, source: playlistResponse.href};
 
@@ -219,7 +221,7 @@ export default class {
         while (tracksResponse.next) {
           // eslint-disable-next-line no-await-in-loop
           ({body: tracksResponse} = await this.spotify.getPlaylistTracks(uri.id, {
-            limit: parseInt(new URL(tracksResponse.next).searchParams.get('limit') ?? '50', 10),
+            limit: parseInt(new URL(tracksResponse.next).searchParams.get('limit') ?? `${this.playlistLimit}`, 10),
             offset: parseInt(new URL(tracksResponse.next).searchParams.get('offset') ?? '0', 10),
           }));
 
@@ -252,13 +254,13 @@ export default class {
       }
     }
 
-    // Get 50 random songs if many
+    // Get random songs if many then limit to playlistLimit (defaults to 50)
     const originalNSongs = tracks.length;
 
-    if (tracks.length > 50) {
+    if (tracks.length > this.playlistLimit) {
       const shuffled = shuffle(tracks);
 
-      tracks = shuffled.slice(0, 50);
+      tracks = shuffled.slice(0, this.playlistLimit);
     }
 
     let songs = await Promise.all(tracks.map(async track => this.spotifyToYouTube(track, playlist)));