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persistStore.js
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persistStore.js
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import forEach from 'lodash.foreach'
import constants from './constants'
import createAsyncLocalStorage from './defaults/asyncLocalStorage'
import getStoredState from './getStoredState'
const genericSetImmediate = typeof setImmediate === 'undefined' ? global.setImmediate : setImmediate
export default function persistStore (store, config = {}, onComplete) {
// defaults
const blacklist = config.blacklist || []
const whitelist = config.whitelist || false
const serialize = config.serialize || defaultSerialize
const deserialize = config.deserialize || defaultDeserialize
const transforms = config.transforms || []
const storage = config.storage || createAsyncLocalStorage('local')
const debounce = config.debounce || false
const shouldRestore = !config.skipRestore
// initialize values
let timeIterator = null
let lastState = store.getState()
let purgeMode = false
let storesToProcess = []
// restore
if (shouldRestore) {
genericSetImmediate(() => {
getStoredState({...config, purgeMode}, (err, restoredState) => {
if (err && process.env.NODE_ENV !== 'production') console.warn('Error in getStoredState', err)
store.dispatch(rehydrateAction(restoredState))
onComplete && onComplete(null, restoredState)
})
})
} else onComplete && genericSetImmediate(onComplete)
// store
store.subscribe(() => {
if (timeIterator !== null) clearInterval(timeIterator)
let state = store.getState()
forEach(state, (subState, key) => {
if (whitelistBlacklistCheck(key)) return
if (lastState[key] === state[key]) return
if (storesToProcess.indexOf(key) !== -1) return
storesToProcess.push(key)
})
// time iterator (read: debounce)
timeIterator = setInterval(() => {
if (storesToProcess.length === 0) {
clearInterval(timeIterator)
return
}
let key = createStorageKey(storesToProcess[0])
let endState = transforms.reduce((subState, transformer) => transformer.in(subState), state[storesToProcess[0]])
if (typeof endState !== 'undefined') storage.setItem(key, serialize(endState), warnIfSetError(key))
storesToProcess.shift()
}, debounce)
lastState = state
})
function whitelistBlacklistCheck (key) {
if (whitelist && whitelist.indexOf(key) === -1) return true
if (blacklist.indexOf(key) !== -1) return true
return false
}
function adhocRehydrate (serialized, cb) {
let state = null
try {
let data = deserialize(serialized)
state = transforms.reduceRight((interState, transformer) => {
return transformer.out(interState)
}, data)
} catch (err) {
if (process.env.NODE_ENV !== 'production') console.warn('Error rehydrating data:', serialized, err)
}
store.dispatch(rehydrateAction(state))
cb && cb(null, state)
}
function purge (keys) {
purgeMode = keys
forEach(keys, (key) => {
storage.removeItem(createStorageKey(key), warnIfRemoveError(key))
})
}
function purgeAll () {
purgeMode = '*'
storage.getAllKeys((err, allKeys) => {
if (err && process.env.NODE_ENV !== 'production') { console.warn('Error in storage.getAllKeys') }
purge(allKeys.filter(key => key.indexOf(constants.keyPrefix) === 0).map(key => key.slice(constants.keyPrefix.length)))
})
}
// return `persistor`
return {
rehydrate: adhocRehydrate,
purge,
purgeAll
}
}
function warnIfRemoveError (key) {
return function removeError (err) {
if (err && process.env.NODE_ENV !== 'production') { console.warn('Error storing data for key:', key, err) }
}
}
function warnIfSetError (key) {
return function setError (err) {
if (err && process.env.NODE_ENV !== 'production') { console.warn('Error storing data for key:', key, err) }
}
}
function createStorageKey (key) {
return constants.keyPrefix + key
}
function rehydrateAction (data) {
return {
type: constants.REHYDRATE,
payload: data
}
}
function defaultSerialize (data) {
return JSON.stringify(data)
}
function defaultDeserialize (serial) {
return JSON.parse(serial)
}