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88 lines
2.9 KiB
88 lines
2.9 KiB
const EventEmitter = require('events')
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module.exports = class IndexDbController extends EventEmitter {
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constructor (opts) {
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super()
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this.migrations = opts.migrations
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this.key = opts.key
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this.dbObject = global.indexedDB
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this.IDBTransaction = global.IDBTransaction || global.webkitIDBTransaction || global.msIDBTransaction || {READ_WRITE: "readwrite"}; // This line should only be needed if it is needed to support the object's constants for older browsers
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this.IDBKeyRange = global.IDBKeyRange || global.webkitIDBKeyRange || global.msIDBKeyRange;
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this.version = opts.version
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this.logging = opts.logging
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this.initialState = opts.initialState
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if (this.logging) this.on('log', logger)
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}
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// Opens the database connection and returns a promise
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open (version = this.version) {
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return new Promise((resolve, reject) => {
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const dbOpenRequest = this.dbObject.open(this.key, version)
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dbOpenRequest.onerror = (event) => {
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return reject(event)
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}
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dbOpenRequest.onsuccess = (event) => {
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this.db = dbOpenRequest.result
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this.emit('success')
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resolve(this.db)
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}
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dbOpenRequest.onupgradeneeded = (event) => {
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this.db = event.target.result
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this.db.createObjectStore('dataStore')
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}
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})
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.then((openRequest) => {
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return this.get('dataStore')
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})
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.then((data) => {
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if (!data) {
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return this._add('dataStore', this.initialState)
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.then(() => this.get('dataStore'))
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.then((versionedData) => Promise.resolve(versionedData.data))
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}
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return Promise.resolve(data)
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})
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}
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requestObjectStore (key, type = 'readonly') {
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return new Promise((resolve, reject) => {
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const dbReadWrite = this.db.transaction(key, type)
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const dataStore = dbReadWrite.objectStore(key)
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resolve(dataStore)
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})
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}
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get (key = 'dataStore') {
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return this.requestObjectStore(key)
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.then((dataObject)=> {
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return new Promise((resolve, reject) => {
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const getRequest = dataObject.get(key)
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getRequest.onsuccess = (event) => resolve(event.currentTarget.result)
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getRequest.onerror = (event) => reject(event)
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})
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})
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}
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put (state) {
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return this.requestObjectStore('dataStore', 'readwrite')
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.then((dataObject)=> {
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const putRequest = dataObject.put(state, 'dataStore')
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putRequest.onsuccess = (event) => Promise.resolve(event.currentTarget.result)
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putRequest.onerror = (event) => Promise.reject(event)
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})
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}
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_add (key, objStore, cb = logger) {
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return this.requestObjectStore(key, 'readwrite')
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.then((dataObject)=> {
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const addRequest = dataObject.add(objStore, key)
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addRequest.onsuccess = (event) => Promise.resolve(event.currentTarget.result)
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addRequest.onerror = (event) => Promise.reject(event)
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})
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}
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}
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function logger (err, ress) {
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err ? console.error(`Logger says: ${err}`) : console.dir(`Logger says: ${ress}`)
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}
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