redux-offline-queue

This package is a simple solution for handling actions or requests with redux while the app is in an offline state by queueing these, and dispatching them once connectivity is re-established. Works perfect with react-native
Motivation: Provide a better user experience.

• Installation
• Usage
• Compatibility
• Additional Configuration

Installation

yarn add redux-offline-queue
OR (old school)
npm install --save redux-offline-queue

Usage

See example project here: offlineTweet
Get up and running in 4 easy steps:

Step 1: Add the redux-offline-queue reducer to your combine reducers

Either import the { reducer as offline } from redux-offline-queue and add it to the combineReducers or require it like so (whatever floats your boat):

import { combineReducers } from 'redux'

export default combineReducers({
    offline: require('redux-offline-queue').reducer,
    yourOtherReducer: require('~App/yourOtherReducer').reducer,
})

Step 2: Add the offlineMiddleware

import { offlineMiddleware } from 'redux-offline-queue'

const composeStoreWithMiddleware = applyMiddleware(
  offlineMiddleware()
)(createStore)

Note that this queue is not persisted by itself. One should provide a persistence config by using e.g. redux-persist to keep the offline queue persisted.

Step 3: Declare the actions to be queued

With reduxsauce

import { createReducer, createActions } from 'reduxsauce'
import { markActionsOffline } from 'redux-offline-queue'

const { Types, Creators } = createActions({
    requestBlogs: null,
    createBlog: ['blog'],
})

markActionsOffline(Creators, ['createBlog'])
...

Without

import { markActionsOffline } from 'redux-offline-queue'

const Creators = {
  createBlog: blog => ({
    type: 'CREATE_BLOG',
    blog,
  }),
}

markActionsOffline(Creators, ['createBlog'])
...

Last but not least...

Step 4: Monitor the connectivity and let the library know.

import { OFFLINE, ONLINE } from 'redux-offline-queue'

if (appIsConnected) {
    dispatch({ type: ONLINE })
} else {
    dispatch({ type: OFFLINE })
}

Works perfect with React Native's NetInfo

import { put, take, call } from 'redux-saga/effects'
import NetInfo from '@react-native-community/netinfo'
import { OFFLINE, ONLINE } from 'redux-offline-queue'

function* startWatchingNetworkConnectivity() {
  const channel = eventChannel((emitter) => {
    NetInfo.isConnected.addEventListener('connectionChange', emitter)
    return () => NetInfo.isConnected.removeEventListener('connectionChange', emitter)
  })
  try {
    while(true) {
      const isConnected = yield take(channel)
      if (isConnected) {
        yield put({ type: ONLINE })
      } else {
        yield put({ type: OFFLINE })
      }
    }
  } finally {
    channel.close()
  }
}

Android
If react native's NetInfo is intended to be used, for android don't forget to add the following to the AndroidManifest.xml :

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Inspired by redux-queue-offline(mathieudutour)
Developed by Krzysztof Ciombor

Compatibility

with redux-saga

If you are using redux-sagas for http requests and want to fire your redux actions normally, but suspend(queue) sagas, for Step 2, do the following instead:

import { applyMiddleware } from 'redux'
import createSagaMiddleware from 'redux-saga'
import {
  offlineMiddleware,
  suspendSaga,
  consumeActionMiddleware,
} from 'redux-offline-queue'

const middleware = []

middleware.push(offlineMiddleware())
const suspendSagaMiddleware = suspendSaga(createSagaMiddleware())
middleware.push(suspendSagaMiddleware)
middleware.push(consumeActionMiddleware())

applyMiddleware(...middleware)

It is IMPORTANT that the consumeActionMiddleware is placed last, so you can allow the previous middlewares to react first before eventually getting consumed.

Additional Configuration

Additional configuration can be passed with offlineMiddleware(), such as adding additional triggers that will trigger the offline queue to dispatch its actions:

...
import { REHYDRATE } from 'redux-persist'

applyMiddleware(offlineMiddleware({
    additionalTriggers: REHYDRATE,
}))
...

Contributing

Bug reports and pull requests are welcome. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

Original work copyright 2018-2019 Inspire Innovation BV. Continued work copyright 2019 Roberto Pando.
Read LICENSE for details.
The development of this package has been sponsored by Inspire Innovation BV (Utrecht, The Netherlands).