const openReqs = {} const databaseCache = {} import { META_STORE, TIMELINE_STORE, STATUSES_STORE } from './constants' export function getDatabase(instanceName) { if (databaseCache[instanceName]) { return Promise.resolve(databaseCache[instanceName]) } databaseCache[instanceName] = new Promise((resolve, reject) => { let req = indexedDB.open(instanceName, 1) openReqs[instanceName] = req req.onerror = reject req.onblocked = () => { console.log('idb blocked') } req.onupgradeneeded = () => { let db = req.result; db.createObjectStore(META_STORE, {keyPath: 'key'}) db.createObjectStore(STATUSES_STORE, {keyPath: 'id'}) let timelineStore = db.createObjectStore(TIMELINE_STORE, {keyPath: 'id'}) timelineStore.createIndex('statusId', 'statusId') } req.onsuccess = () => resolve(req.result) }) return databaseCache[instanceName] } export async function dbPromise(db, storeName, readOnlyOrReadWrite, cb) { return await new Promise((resolve, reject) => { const tx = db.transaction(storeName, readOnlyOrReadWrite) let store = typeof storeName === 'string' ? tx.objectStore(storeName) : storeName.map(name => tx.objectStore(name)) let res cb(store, (result) => { res = result }) tx.oncomplete = () => resolve(res) tx.onerror = () => reject(tx.error.name + ' ' + tx.error.message) }) } export function deleteDatabase(instanceName) { return new Promise((resolve, reject) => { // close any open requests let openReq = openReqs[instanceName]; if (openReq && openReq.result) { openReq.result.close() } delete openReqs[instanceName] delete databaseCache[instanceName] let req = indexedDB.deleteDatabase(instanceName) req.onsuccess = () => resolve() req.onerror = () => reject(req.error.name + ' ' + req.error.message) }) }