Refactor library into separate class, takes care of building track index, and future plans

.gitignore

@@ -1,5 +1,6 @@
 node_modules
 
+cache
 build
 logs
 

@types/MusicPlayer.d.ts

@@ -8,3 +8,11 @@ export type MusicPlayerOptions = {
     library: string,
     guilds: GuildConfig[]
 }
+
+export type MusicIndexEntry = {
+    arist: string,
+    title: string,
+    album?: string,
+    year?: number,
+    file: string,
+}

package.json

@@ -26,6 +26,7 @@
     "dotenv": "^16.4.5",
     "ffmpeg": "^0.0.4",
     "humanize-duration": "^3.31.0",
+    "music-metadata": "^7.14.0",
     "sodium-native": "^4.1.1",
     "typescript": "^5.4.3",
     "utf-8-validate": "^6.0.3",

src/client/DiscordClient.ts

@@ -95,7 +95,7 @@ class DiscordClient extends Client
         this.#built = true;
         this.emit('built');
 
-        await this.#musicPlayer.initialise();
+        this.#musicPlayer.initialise();
         return this;
     }
 

src/client/components/MusicLibrary.ts

@@ -0,0 +1,133 @@
+
+import path from 'node:path';
+import fs from 'node:fs';
+import { LoggerClient } from '@navy.gif/logger';
+import { parseFile } from 'music-metadata';
+import Util from '../../utilities/Util.js';
+import Initialisable from '../../interfaces/Initialisable.js';
+import DiscordClient from '../DiscordClient.js';
+import { Collection } from 'discord.js';
+import { MusicIndexEntry } from '../../../@types/MusicPlayer.js';
+
+
+class MusicLibrary implements Initialisable
+{
+    #path: string;
+    #ready: boolean;
+    #index: Collection<string, MusicIndexEntry>;
+    #logger: LoggerClient;
+    constructor (client: DiscordClient, libraryPath: string)
+    {
+        this.#path = libraryPath;
+        this.#ready = false;
+        this.#index = new Collection();
+        this.#logger = client.createLogger(this);
+    }
+
+    get ready ()
+    {
+        return this.#ready;
+    }
+
+    get size ()
+    {
+        return this.#index.size;
+    }
+
+    async initialise (): Promise<void>
+    {
+        if (this.ready)
+            return;
+        this.#logger.info('Initialising music library');
+        this.loadIndex();
+        await this.scanLibrary();
+        this.#ready = true;
+        this.#logger.info(`Music library initialised with ${this.#index.size} entries`);
+    }
+
+    stop (): void | Promise<void>
+    {
+        throw new Error('Method not implemented.');
+    }
+
+    getRandom ()
+    {
+        return this.#index.random();
+    }
+
+    getShufflePlaylist ()
+    {
+        const entries = [ ...this.#index.values() ];
+        return Util.shuffle(entries);
+    }
+
+    async scanLibrary (full = false)
+    {
+        this.#logger.info('Starting library scan');
+        const start = Date.now();
+        const filePaths = Util.readdirRecursive(this.#path);
+        if (!this.#index.size)
+            this.#logger.info('No index built, performing first time scan. This may take some time depending on the size of your music library');
+
+        const initialSize = this.#index.size;
+        let idx = 0;
+        for (const fp of filePaths)
+        {
+            // Progress reporting
+            idx++;
+            if (idx % 50 === 0 || idx === filePaths.length)
+                this.#logger.info(`Scan progress: ${(idx / filePaths.length * 100).toFixed(2)}%`);
+
+            // Skip already scanned files
+            if (this.#index.has(fp) && !full)
+                continue;
+
+            // Expensive call
+            const metadata = await parseFile(fp, { skipCovers: true });
+            const { common } = metadata;
+            // Fall back to file and folder name if artist or title not available
+            const segmets = fp.replace(this.#path, '').split(path.sep);
+            const artist = segmets[segmets.length - 2];
+            const title = segmets[segmets.length - 1].replace((/\..+$/u), '');
+
+            const entry = {
+                arist: common.artist ?? artist,
+                title: common.title ?? title,
+                album: common.album,
+                year: common.year,
+                file: fp
+            };
+            this.#index.set(fp, entry);
+        }
+        const end = Date.now();
+        const newFiles = this.#index.size - initialSize;
+        this.#logger.info(`Library scan took ${end - start} ms, ${this.#index.size} (new ${newFiles}) files indexed`);
+        this.saveIndex();
+        return newFiles;
+    }
+
+    loadIndex ()
+    {
+        this.#logger.info('Loading index');
+        const indexPath = path.join(process.cwd(), 'cache', 'musicIndex.json');
+        if (!fs.existsSync(indexPath))
+            return this.#logger.info('No index file found');
+        const raw = fs.readFileSync(indexPath, { encoding: 'utf-8' });
+        const parsed = JSON.parse(raw) as MusicIndexEntry[];
+        for (const entry of parsed)
+            this.#index.set(entry.file, entry);
+    }
+
+    saveIndex ()
+    {
+        this.#logger.info('Saving index to file');
+        const cachePath = path.join(process.cwd(), 'cache');
+        if (!fs.existsSync(cachePath))
+            fs.mkdirSync(cachePath);
+        const indexPath = path.join(cachePath, 'musicIndex.json');
+        fs.writeFileSync(indexPath, JSON.stringify([ ...this.#index.values() ]));
+    }
+
+}
+
+export default MusicLibrary;

src/client/components/MusicPlayer.ts

@@ -1,13 +1,11 @@
-import path from 'node:path';
-
-import { ActivityType, ChannelType, Collection, GuildTextBasedChannel } from 'discord.js';
+import { ActivityType, ChannelType, Collection, Guild, GuildTextBasedChannel, VoiceChannel } from 'discord.js';
 import { AudioPlayer, AudioPlayerStatus, AudioResource, PlayerSubscription, VoiceConnection, createAudioPlayer, createAudioResource, joinVoiceChannel } from '@discordjs/voice';
 import { LoggerClient } from '@navy.gif/logger';
 
 import Initialisable from '../../interfaces/Initialisable.js';
 import DiscordClient from '../DiscordClient.js';
-import Util from '../../utilities/Util.js';
-import { MusicPlayerOptions } from '../../../@types/MusicPlayer.js';
+import { MusicIndexEntry, MusicPlayerOptions } from '../../../@types/MusicPlayer.js';
+import MusicLibrary from './MusicLibrary.js';
 
 type ConnectionDetails = {
     subscription: PlayerSubscription,
@@ -24,13 +22,13 @@ class MusicPlayer implements Initialisable
 
     #connections: Collection<string, ConnectionDetails>;
     #player: AudioPlayer;
-
-    #library: string[];
-    #currentIdx: number;
     #currentResource!: AudioResource;
 
     #options: MusicPlayerOptions;
     #volume: number;
+    #library: MusicLibrary;
+    #shuffleIdx: number;
+    #shuffleList: MusicIndexEntry[];
 
     constructor (client: DiscordClient, options: MusicPlayerOptions)
     {
@@ -42,10 +40,12 @@ class MusicPlayer implements Initialisable
         this.#player = createAudioPlayer();
 
         this.#options = options;
-        this.#library = [];
-        this.#currentIdx = 0;
         this.#volume = 0.3;
 
+        this.#library = new MusicLibrary(client, this.#options.library);
+        this.#shuffleList = [];
+        this.#shuffleIdx = 0;
+
         this.#player.on(AudioPlayerStatus.Idle, this.playNext.bind(this));
     }
 
@@ -54,28 +54,33 @@ class MusicPlayer implements Initialisable
         return this.#ready;
     }
 
+    get library ()
+    {
+        return this.#library;
+    }
+
     playNext ()
     {
-        const uri = this.#library[this.#currentIdx];
-        const segmets = uri.replace(this.#options.library, '').split(path.sep);
-        const artist = segmets[segmets.length - 2];
-        const title = segmets[segmets.length - 1].replace((/\..+$/u), '');
-        const display = `[${artist ?? 'Unknown'}] ${title}`;
-        this.#currentResource = createAudioResource(uri, {
+        const info = this.#shuffleList[this.#shuffleIdx];
+
+        this.#currentResource = createAudioResource(info.file, {
             inlineVolume: true,
             metadata: {
-                display
-            } });
+                title: info.title
+            }
+        });
         this.#currentResource.volume?.setVolume(this.#volume);
-        this.#logger.info(`Now playing ${display}`);
+
+        this.#logger.info(`Now playing ${info.arist} - ${info.title}`);
         this.#player.play(this.#currentResource);
-        this.#currentIdx++;
+        this.#shuffleIdx++;
         this.#client.user?.setPresence({
             activities: [{
-                name: display,
+                name: `${info.arist} - ${info.title}`,
                 type: ActivityType.Playing
             }]
         });
+
         const outputChannels = this.#connections.map(obj => obj.textOutput);
         outputChannels.forEach(async channel =>
         {
@@ -84,11 +89,17 @@ class MusicPlayer implements Initialisable
             const messages = await channel.messages.fetch({ limit: 100 });
             const filtered = messages.filter(msg => msg.author.id === this.#client.user?.id);
 
-            await channel.send(`Now playing **${display}**`);
-            // await channel.bulkDelete(filtered);
+            await channel.send({
+                embeds: [{
+                    title: 'Now playing :notes:',
+                    description: `**${info.title}** by ${info.arist}`,
+                    color: 0xffafff
+                }]
+            });
+
             for (const [ , msg ] of filtered)
             {
-                if (msg.deletable && msg.content.startsWith('Now playing'))
+                if (msg.deletable && (msg.embeds.length || msg.content.startsWith('Now playing')))
                     await msg.delete();
             }
         });
@@ -117,10 +128,23 @@ class MusicPlayer implements Initialisable
         }
     }
 
-    initialise ()
+    async initialise ()
     {
         if (this.ready)
             return;
+        this.#logger.info('Initialising music player');
+
+        await this.#library.initialise();
+
+        this.#shuffleList = this.#library.getShufflePlaylist();
+
+        this.initialiseVoiceChannels();
+
+        this.playNext();
+    }
+
+    initialiseVoiceChannels ()
+    {
         for (const config of this.#options.guilds)
         {
             const { id, voiceChannel, textOutput } = config;
@@ -137,6 +161,13 @@ class MusicPlayer implements Initialisable
                 continue;
             }
 
+            if (!this.joinVoiceChannel(guild, channel, textOutput))
+                continue;
+        }
+    }
+
+    joinVoiceChannel (guild: Guild, channel: VoiceChannel, output?: string)
+    {
         const connection = joinVoiceChannel({
             channelId: channel.id,
             guildId: guild.id,
@@ -146,13 +177,13 @@ class MusicPlayer implements Initialisable
         if (!subscription)
         {
             connection.disconnect();
-                continue;
+            return false;
         }
 
         let textChannel = null;
-            if (textOutput)
+        if (output)
         {
-                textChannel = guild.channels.resolve(textOutput);
+            textChannel = guild.channels.resolve(output);
             if (!textChannel?.isTextBased())
             {
                 textChannel = null;
@@ -161,20 +192,7 @@ class MusicPlayer implements Initialisable
         }
         this.#connections.set(guild.id, { connection, subscription, textOutput: textChannel });
         this.#logger.info(`Connected to voice in ${guild.name}`);
-        }
-
-        this.scanLibrary();
-        this.playNext();
-    }
-
-    scanLibrary ()
-    {
-        const current = this.#library.length;
-        const library = Util.readdirRecursive(this.#options.library);
-        this.#logger.info(`Scanned music library, found ${library.length} tracks`);
-        this.#library = Util.shuffle(library);
-        const after = this.#library.length;
-        return [ after, after - current ];
+        return true;
     }
 
 }

src/client/components/commands/Rescan.ts

@@ -13,7 +13,8 @@ class PingCommand extends Command
 
     async execute ()
     {
-        const [ songs, diff ] = this.client.musicPlayer.scanLibrary();
+        const diff = this.client.musicPlayer.library.scanLibrary();
+        const songs = this.client.musicPlayer.library.size;
         return `Found ${songs} tracks with ${diff} new ones`;
     }
 }

src/client/components/observers/CommandHandler.ts

@@ -29,7 +29,7 @@ class CommandHandler extends Observer
             commands: this.client.commands.values(),
             prefix: client.prefix,
             resolver: client.resolver,
-            debug: true
+            debug: false
         });
 
         this.#parser.on('debug', (str: string) => this.logger.debug(str));

src/utilities/Util.ts

@@ -559,6 +559,16 @@ class Util
         return null;
     }
 
+
+    /**
+     * Shuffles array in place
+     * @date 3/25/2024 - 11:25:09 AM
+     *
+     * @static
+     * @template T
+     * @param {T[]} array
+     * @returns {T[]}
+     */
     static shuffle<T> (array: T[]): T[]
     {
         let current = array.length;

yarn.lock

@@ -1749,6 +1749,13 @@ __metadata:
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   linkType: hard
 
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@@ -2999,6 +3024,13 @@ __metadata:
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@@ -3326,6 +3358,13 @@ __metadata:
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@@ -3468,6 +3507,21 @@ __metadata:
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+    debug: "npm:^4.3.4"
+    file-type: "npm:^16.5.4"
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@@ -3508,6 +3562,7 @@ __metadata:
     eslint: "npm:^8.57.0"
     ffmpeg: "npm:^0.0.4"
     humanize-duration: "npm:^3.31.0"
+    music-metadata: "npm:^7.14.0"
     sodium-native: "npm:^4.1.1"
     typescript: "npm:^5.4.3"
     utf-8-validate: "npm:^6.0.3"
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