WIP

raw/worker/app.js

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+const tagger = new Tagger(self),
+    eventHandler = new EventHandler(self);
+
+tagger.init();

raw/worker/database.js

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+class Database {
+    constructor(name, version) {
+        this.isInit = false;
+        this.name = name;
+        this.version = version;
+        this.errored = false;
+        this.db;
+        this.prepareDB();
+    }
+
+    async prepareDB() {
+        if (this.isInit || this.errored) {
+            return;
+        }
+        let req = this.db = indexedDB.open(this.name, this.version);
+        req.onerror = DatabaseHandler.onError.bind(this);
+        req.onsuccess = DatabaseHandler.onSuccess.bind(this);
+        req.onupgradeneeded = DatabaseHandler.onUpgrade.bind(this);
+        req.onblocked = DatabaseHandler.onBlocked.bind(this);
+    }
+
+    async set(key, data, store) {
+        data['key'] = key;
+        return await this.run('put', data, store);
+    }
+
+    async get(key, store) {
+        return await this.run('get', key, store);
+    }
+
+    async remove(key, store) {
+        return await this.run('delete', key, store);
+    }
+
+    check() {
+        return !(!this.isInit || this.errored);
+    }
+
+    async getTX(store) {
+        return await this.db.transaction([store], "readwrite")
+    }
+
+    async getObjectStore(tx, store) {
+        return await tx.objectStore(store)
+    }
+
+    async run(action, key, store) {
+        if (this.check()) {
+            let tx = await this.getTX(store);
+            let obj = await this.getObjectStore(tx, store);
+            let data = await this.request(obj[action](key));
+            await tx.complete
+            return await data;
+        }
+        return null;
+    }
+
+    request(req) {
+        return new Promise((resolve, reject) => {
+            req.onsuccess = () => resolve(req.result);
+            req.onerror = () => reject(req.error);
+        });
+    }
+}
+
+class DatabaseHandler {
+    static onError(e) {
+        this.errored = true;
+        eventHandler.sendData("databaseError", "error", e.message);
+    }
+
+    static onSuccess(e) {
+        this.db = this.db.result;
+        this.isInit = true;
+        eventHandler.sendData("databaseCreated", "success", "");
+        eventHandler.handleEvent({
+            data: {
+                cmd: 'dbReady-' + this.name,
+                data: this.db
+            }
+        });
+    }
+
+    static onUpgrade(e) {
+        eventHandler.sendData("databaseUpgradeNeeded", "info", e.message);
+        eventHandler.handleEvent({
+            data: {
+                cmd: 'dbUpgrade-' + this.name,
+                data: this.db
+            }
+        });
+    }
+
+    static onBlocked(e) {
+        eventHandler.sendData("databaseBlocked", "error", e.message);
+    }
+}

raw/worker/eventHandler.js

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+class EventHandler {
+    constructor(worker) {
+        this.events = {};
+        this.worker = worker;
+        this.worker.addEventListener('message', this.handleEvent.bind(this));
+    }
+
+    addEvent(name, cb) {
+        this.events[name] = cb;
+    }
+
+    sendData(name, status, data) {
+        this.worker.postMessage({
+            cmd: name,
+            status: status,
+            data: data
+        });
+    }
+
+    handleEvent(event) {
+        let data = event.data;
+        if (!data.cmd) {
+            return;
+        }
+
+        if (this.events[data.cmd]) {
+            this.events[data.cmd](data.data);
+        }
+    }
+}

raw/worker/id3.js

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+self.importScripts('jsmediatags.min.js');
+
+class Tagger {
+    constructor(worker) {
+        this.db = new Database("SongLib", 1);
+    }
+
+    static prepareName(data) {
+        let name = data.name || '';
+        return name.replace(/[^\w\s]/gi, '').split(" ").join("")
+    }
+
+    init() {
+        eventHandler.addEvent('getData', this.getData.bind(this));
+        eventHandler.addEvent('removeData', this.getData.bind(this));
+        eventHandler.addEvent('setData', this.getData.bind(this));
+        eventHandler.addEvent('dbReady-SongLib', this.ready.bind(this));
+        eventHandler.addEvent('dbUpgrade-SongLib', this.upgrade.bind(this));
+    }
+
+    async getData(data) {
+        let key = Tagger.prepareName(data),
+            newData = await this.db.get(key, 'songs'),
+            handlerName = data.force ? 'id3-request-force' : 'id3-request';
+        if (newData) {
+            newData['index'] = data['index'];
+            eventHandler.sendData(handlerName, 'success', newData);
+        } else {
+            this.parseData(data, key).then(r => {
+                r['index'] = data['index'];
+                eventHandler.sendData(handlerName, 'success', r);
+            });
+            eventHandler.sendData(handlerName, 'waiting', data);
+        }
+    }
+
+    async removeData(data) {
+        let key = Tagger.prepareName(data),
+            newData = await this.db.remove(key, 'songs');
+        eventHandler.sendData('id3-remove', 'success', newData);
+    }
+
+    async setData(data, key) {
+        let newData = await this.db.set(key, data, 'songs');
+        eventHandler.sendData('id3-set', 'success', newData);
+    }
+
+    ready(data) {
+        console.log("[ID3] > Song Database Ready");
+        eventHandler.sendData('id3-ready', "startup", "");
+    }
+
+    upgrade(data) {
+        let db = data.result,
+            songs = db.createObjectStore("songs", {keyPath: 'key'});
+        songs.createIndex("name", "name", {unique: false});
+    }
+
+    //if not found in key-value storage read it! this take some time so this is async!
+    async parseData(data, key) {
+        let tag = await new Promise((resolve, reject) => {
+            new jsmediatags.Reader(data.file)
+                .read({
+                    onSuccess: (tag) => {
+                        resolve(tag);
+                    },
+                    onError: (error) => {
+                        console.log(`[ID3] > Error Parsing Data!`);
+                        resolve({
+                            tags: {}
+                        });
+                    }
+                });
+        })
+        let tags = tag.tags,
+            values = {
+                title: tags.title || data.name,
+                artist: tags.artist || 'VA',
+                genre: tags.genre || 'Unknown',
+                year: tags.year || 1970,
+                key: key
+            };
+        await this.setData(values, key);
+        return values;
+    }
+}