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Copy pathstate-store.js
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126 lines (105 loc) · 2.88 KB
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'use strict'
module.exports =
class StateStore {
constructor (databaseName, version) {
this.connected = false
this.databaseName = databaseName
this.version = version
}
get dbPromise () {
if (!this._dbPromise) {
this._dbPromise = new Promise((resolve) => {
const dbOpenRequest = indexedDB.open(this.databaseName, this.version)
dbOpenRequest.onupgradeneeded = (event) => {
let db = event.target.result
db.createObjectStore('states')
}
dbOpenRequest.onsuccess = () => {
this.connected = true
resolve(dbOpenRequest.result)
}
dbOpenRequest.onerror = (error) => {
console.error('Could not connect to indexedDB', error)
this.connected = false
resolve(null)
}
})
}
return this._dbPromise
}
isConnected () {
return this.connected
}
connect () {
return this.dbPromise.then((db) => !!db)
}
save (key, value) {
return new Promise((resolve, reject) => {
this.dbPromise.then((db) => {
if (db == null) return resolve()
var request = db.transaction(['states'], 'readwrite')
.objectStore('states')
.put({value: value, storedAt: new Date().toString()}, key)
request.onsuccess = resolve
request.onerror = reject
})
})
}
load (key) {
return this.dbPromise.then((db) => {
if (!db) return
return new Promise((resolve, reject) => {
var request = db.transaction(['states'])
.objectStore('states')
.get(key)
request.onsuccess = (event) => {
let result = event.target.result
if (result && !result.isJSON) {
resolve(result.value)
} else {
resolve(null)
}
}
request.onerror = (event) => reject(event)
})
})
}
delete (key) {
return new Promise((resolve, reject) => {
this.dbPromise.then((db) => {
if (db == null) return resolve()
var request = db.transaction(['states'], 'readwrite')
.objectStore('states')
.delete(key)
request.onsuccess = resolve
request.onerror = reject
})
})
}
clear () {
return this.dbPromise.then((db) => {
if (!db) return
return new Promise((resolve, reject) => {
var request = db.transaction(['states'], 'readwrite')
.objectStore('states')
.clear()
request.onsuccess = resolve
request.onerror = reject
})
})
}
count () {
return this.dbPromise.then((db) => {
if (!db) return
return new Promise((resolve, reject) => {
var request = db.transaction(['states'])
.objectStore('states')
.count()
request.onsuccess = () => {
resolve(request.result)
}
request.onerror = reject
})
})
}
}