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const extension = require('extensionizer')
const log = require('loglevel')
/**
* A wrapper around the extension's storage local API
*/
module.exports = class ExtensionStore {
/**
* @constructor
*/
constructor() {
this.isSupported = !!(extension.storage.local)
if (!this.isSupported) {
log.error('Storage local API not available.')
}
}
/**
* Returns all of the keys currently saved
* @return {Promise<*>}
*/
async get() {
if (!this.isSupported) return undefined
const result = await this._get()
// extension.storage.local always returns an obj
// if the object is empty, treat it as undefined
if (isEmpty(result)) {
return undefined
} else {
return result
}
}
/**
* Sets the key in local state
* @param {object} state - The state to set
* @return {Promise<void>}
*/
async set(state) {
return this._set(state)
}
/**
* Returns all of the keys currently saved
* @private
* @return {object} the key-value map from local storage
*/
_get() {
const local = extension.storage.local
return new Promise((resolve, reject) => {
local.get(null, (/** @type {any} */ result) => {
const err = extension.runtime.lastError
if (err) {
reject(err)
} else {
resolve(result)
}
})
})
}
/**
* Sets the key in local state
* @param {object} obj - The key to set
* @return {Promise<void>}
* @private
*/
_set(obj) {
const local = extension.storage.local
return new Promise((resolve, reject) => {
local.set(obj, () => {
const err = extension.runtime.lastError
if (err) {
reject(err)
} else {
resolve()
}
})
})
}
}
/**
* Returns whether or not the given object contains no keys
* @param {object} obj - The object to check
* @returns {boolean}
*/
function isEmpty(obj) {
return Object.keys(obj).length === 0
}
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