wordpress serverless with docker and AWS

If you are like one of us how want to create own blog site quickly and want to keep the running costs bottom low, this is for you.


  1. spin up a wordpress setup on local machine using docker compose.
  2. create blog post.
  3. generate static pages for all your posts.
    • use WP2Static plugin
  4. use AWS S3 static website hosting to take this content live.
  5. take backup of wordpress and put that in AWS S3 bucket.

All the above (other than creating content) takes less than 1 hour first time and less than 5 minutes every time after that.


  1. super low operational cost.
    • since you are paying only for the storage, it works out really cheap
  2. content is secure
    • given that all your wordpress content is backed up in private bucket, it is secure. only static pages are exposed live which are not vulnerable for hacking unlike non-static websites.
  3. faster website
    • static content pages are served fast by taking all the advantages of AWS CDN and since no processing is required.
  4. less prone to downtime.
    • since all the wordpress work (installing new plugins, playing with themes etc etc) is done offline, you are safe even you mess up. Just start again from the backup and you are good to go.


Please feel free to refer the running example code at my github

React Roadmap 2019

alt text

If you know basic JavaScript and ES6 or using any single page application JS framework and want to learn React JS, this roadmap is for you.

⋅⋅* Concept of Props

⋅⋅* Concept of States

⋅⋅* React life-cycle

⋅⋅* Form Elements in ReactJS

⋅⋅* Higher Order Components eg Pure Component

⋅⋅* axios

⋅⋅* fetch

State Management

⋅⋅* Redux (Majorly used)

⋅⋅* Mobx


⋅⋅* Redux Form (Majorly used)

⋅⋅* Formix (Trending)


⋅⋅* Redux-Saga

⋅⋅* Redux Thunk

React 16 features

⋅⋅* Hooks

React Performance

⋅⋅* How to measure

⋅⋅* Gochas

⋅⋅* Improvements

Unit Test Cases

⋅⋅* Jest

⋅⋅* Enzyme


⋅⋅* react-helmet

⋅⋅* react-aria-live

⋅⋅* react-a11y-announcer

⋅⋅* Focus Management

⋅⋅* eslint-plugin-jsx-a11y


⋅⋅* SCSS

CSS in JS libraries

⋅⋅* Styled Components

⋅⋅* EmotionJS

⋅⋅* Glamour

Server side rendering

⋅⋅* Next JS

⋅⋅* After JS


React Roadmap

alt text
Credit: github.com/adam-golab/react-developer-roadmap

Gatsby with Contentful

React Performance

Accessibility in ReactJS

Spring Boot Ehcache Replication Example

1. Overview

Let’s look at an example of using Ehcache replication with Spring Boot having ActiveMQ as JMS support.

The example is a simple REST service that saves and query Person details.

Assumption here is the you have ActiveMQ running on localhost on default tcp port (61616).

This example is tested on Mac on ActiveMQ version 5.14.3

2. Dependencies


3. Example

Let’s create a simple REST controller :

@RequestMapping(value = "/person")
public class PersonController {

    private PersonService personService;
    public Person queryById(Long id) {
        Person person = personService.queryById(id);
        return person;
    public Person savePerson() {
        Person person = new Person();
        person = personService.savePerson(person);
        return person;

Now let’s create the service.

public class PersonServiceImpl implements PersonService {
    private PersonRepository personRepository;
    @Cacheable(key = "#id", value = "person")
    public Person queryById(Long id) {
        return personRepository.findById(id).get();
    @Cacheable(key = "#person.id", value = "person")
    public Person savePerson(Person person) {
        return personRepository.save(person);

Finally, let’s create our main Spring Boot application:

public class CacheApplication {
public static void main(String[] args) {
        SpringApplication.run(CacheApplication.class, args);

4. Cache Configuration

public class CacheConfig {

entries in application.properties



<?xml version="1.0" encoding="UTF-8"?>
  <diskStore path="java.io.tmpdir"/>
        propertySeparator="," />
  <cache name="person" maxElementsInMemory="10" eternal="false"
       timeToIdleSeconds="20" timeToLiveSeconds="20" overflowToDisk="false">
            propertySeparator="," />
                        timeoutMillis=10000" />

we need to provide implementation for TestActiveMQInitialContextFactory

public class TestActiveMQInitialContextFactory extends ActiveMQInitialContextFactory {
   public Context getInitialContext(Hashtable environment) throws NamingException {
      Map<String, Object> data = new ConcurrentHashMap<String, Object>();
      String replicationTopicConnectionFactoryBindingName = (String) environment.get(JMSUtil.TOPIC_CONNECTION_FACTORY_BINDING_NAME);
        if (replicationTopicConnectionFactoryBindingName != null) {
            try {
                data.put(replicationTopicConnectionFactoryBindingName, createConnectionFactory(environment));
            } catch (URISyntaxException e) {
                throw new NamingException("Error initialisating TopicConnectionFactory with message " + e.getMessage());
      String getQueueConnectionfactoryBindingName = (String) environment.get(JMSUtil.GET_QUEUE_CONNECTION_FACTORY_BINDING_NAME);
      try {
            data.put(getQueueConnectionfactoryBindingName, createConnectionFactory(environment));
        } catch (URISyntaxException e) {
            throw new NamingException("Error initialisating TopicConnectionFactory with message " + e.getMessage());
      String replicationTopicBindingName = (String) environment.get(JMSUtil.REPLICATION_TOPIC_BINDING_NAME);
        String getQueueBindingName = (String) environment.get(JMSUtil.GET_QUEUE_BINDING_NAME);
        if (replicationTopicBindingName != null) {
            data.put(replicationTopicBindingName, createTopic(replicationTopicBindingName));
      data.put(getQueueBindingName, createQueue(getQueueBindingName));
        return createContext(environment, data);

5. In Action

We can use Maven to start this app by running mvn spring-boot:run.

Then open up a browser and access the REST service on port 8080.

Start with hitting http://localhost:8080/person/savePerson to populate the data in the database as well as in cache.

now hit http://localhost:8080/person/queryById?id=1 to get the data served from cache.

You can run the same app again on localhost (on different port) along with the first one to simulate the cache replication.

The full source code can be found at :


Render HTML tree from flat array structure

First step is to convert flat array into Hierarchy

const hierarchy = products.reduceRight((child, obj) => {
 if (child) {
  return [Object.assign({}, obj, { child })];
 return [obj];
 }, null);

This will return

const renderHierarchy = child => child.map(hierarchy => (
 <Node node={hierarchy}>


import React from ‘react’;
import PropTypes from ‘prop-types’;
const propTypes = {
 children: PropTypes.array,
 node: PropTypes.object,
const defaultProps = {
 children: null,
 node: <div />,
export default function Node({ children, node }) {
 let childnodes = null;
// the Node component calls itself if there are children
 if (children) {
 childnodes = children.map(childnode => (
 <Node node={childnode} >
// return our list element
 // display children if there are any
 return (
 <li key={node.id}>
 { childnodes ?
 : null }
Node.propTypes = propTypes;
Node.defaultProps = defaultProps;

Test your output

Note: This article was earlier published here


After.js + Styled components, The really simple guide


I recently started using After.js and quite honestly, I have to say, After.js is an awesome tool. It gives you many out of the box features. Overall it is one of the perfect solutions for server-side rendering.

Styled component is a full, scoped and component-friendly CSS support for JSX (rendered on the server or the client), and while this is great, I rather use styled components, it’s just my preference.

After.js bundle has a basic example of server-side rendering but that does not include implementation of Styled components.

This guide will explain step by step implementation of styled component on top of the example given in After.js bundle.

Step 1: Run example of After.js

yarn global add create-razzle-app
create-razzle-app --example with-afterjs myapp
cd myapp
yarn start

Step 2: Add Styled components in the package.json dependency list

yarn add styled-components --save

Step 3: Create the custom Documents.js file

// ./src/Document.js
import React from 'react';
import { ServerStyleSheet } from 'styled-components'
import { AfterRoot, AfterData } from '@jaredpalmer/after';
export default class Document extends React.Component {
  static async getInitialProps({ assets, data, renderPage }) {
    const sheet = new ServerStyleSheet()
    const page = await renderPage(App => props => sheet.collectStyles(<App {...props} />))
    const styleTags = sheet.getStyleElement()
    return { assets, data, ...page, styleTags};
render() {
    const { helmet, assets, data, styleTags } = this.props;
    // get attributes from React Helmet
    const htmlAttrs = helmet.htmlAttributes.toComponent();
    const bodyAttrs = helmet.bodyAttributes.toComponent();
return (
      <html {...htmlAttrs}>
          <meta httpEquiv="X-UA-Compatible" content="IE=edge" />
          <meta charSet="utf-8" />
          <title>Hi, Welcome to the Afterparty</title>
          <meta name="viewport" content="width=device-width, initial-scale=1" />
          {/** here is where we put our Styled Components styleTags... */}
        <body {...bodyAttrs}>
          <AfterRoot />
          <AfterData data={data}/>

Step 4: Edit src/server.js

// ./src/server.js
import express from 'express';
import { render } from '@jaredpalmer/after';
import routes from './routes';
import MyDocument from './Document';
const assets = require(process.env.RAZZLE_ASSETS_MANIFEST);
const server = express();
  .get('/*', async (req, res) => {
    try {
      const html = await render({
        document: MyDocument,
        // Anything else you add here will be made available
        // within getInitialProps(ctx)
        // e.g a redux store...
        customThing: 'thing',
    } catch (error) {
      res.json({ message: error.message, stack: error.stack });
export default server;

Step 5: Let’s edit examples/basic/src/home.js

// ./src/home.js
import React, { Component } from 'react';
import logo from './react.svg';
import { Link } from 'react-router-dom';
import styled from 'styled-components';
class Home extends Component {
  static async getInitialProps({ req, res, match, history, location, ...ctx }) {
    return { stuff: 'whatevs' };
  render() {
    return (
        <SampleStyledComponent className="Home">
          <div className="Home-header">
            <img src={logo} className="Home-logo" alt="logo" />
            <div>Welcomse to After.js</div>
          <p className="Home-intro">
            To get started, edit
            <code>src/Home.js</code> or <code>src/About.js</code>and save to
          <Link to="/about">About -></Link>
export default Home;
const SampleStyledComponent = styled.div`
  color: red;

Result: Test new CSS in http://localhost:3000/

Feel free to question in the comment section in case of an issue.



Note: This article was previously published here