KnowYourZone

KnowYourZone is a progressive web application to visualize the COVID-19 zone classification of each state and district in Malaysia.

This repository contains the full-stack source files for the website that is available at knowyourzone.xyz. The front-end is built with Bootstrap while the backend is built with Express.js.

Motivation

As the COVID-19 pandemic continues to rage in Malaysia, staying vigilant is a must, especially in hotspots. KnowYourZone is therefore designed to enable you to quickly lookup for your zone's COVID-19 severity, in terms of active cases.

Unlike other dashboards, KnowYourZone focuses on presenting the zone classification of your area in an intuitive and interactive manner, without the clutters of figures and graphs that you might not even care about, enabling you to know your zone within split seconds, if you know your geography well :)

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

Installation

To get started, you will need Git and Node.js (which comes with npm) installed on your machine.

# Clone the repository
git clone https://github.com/kphilemon/knowyourzone.git

# Go into the repository
cd knowyourzone

# Install dependencies
npm install

Configuration

Next, you will need to configure the application. The detailed usage of each environment variable is documented in the .env.example file.

# make a copy of the .env.example file
cp .env.example .env

# edit the variables using a text editor and save
nano .env

Starting the Server

Once the server starts listening, you should be able to view the website at localhost:3000 or any alternative port number that you have configured previously.

npm start

# console output
info: Data update started
info: Data update successful
info: Server is listening on port 3000

Testing

Make sure all the dependencies are installed before running the test suite.

npm install
npm test

Important Note

You might encounter Failed to launch chrome error while starting the server or running tests on Ubuntu machines. This is due to missing dependencies as mentioned in this puppeteer installation guide. To fix this, simply install them by running:

sudo apt-get install gconf-service libasound2 libatk1.0-0 libatk-bridge2.0-0 libc6 libcairo2 libcups2 libdbus-1-3 libexpat1 libfontconfig1 libgcc1 libgconf-2-4 libgdk-pixbuf2.0-0 libglib2.0-0 libgtk-3-0 libnspr4 libpango-1.0-0 libpangocairo-1.0-0 libstdc++6 libx11-6 libx11-xcb1 libxcb1 libxcomposite1 libxcursor1 libxdamage1 libxext6 libxfixes3 libxi6 libxrandr2 libxrender1 libxss1 libxtst6 ca-certificates fonts-liberation libappindicator1 libnss3 lsb-release xdg-utils wget libgbm-dev

How Does It Work?

The application flow diagram below illustrates the flow of data retrieval and update for this project. The entire process is automated using node-cron and is scheduled during the app start. For knowyourzone.xyz, the cron job is scheduled to be run twice daily on 10AM and 10PM.

1. Data scraping - The server launches a headless browser using Puppeteer to scrape data from the data source. Puppeteer is needed as the data is dynamically rendered at the source website.

2. Rendering index.html - Once the retrieved data is validated, the main page of the website is re-rendered with fresh data using Handlebars.js and it is then stored under the web root. (index.html is git-ignored for this reason)

3. Updating the cache - The data is then cached in memory-cache for data API clients to consume.

4. Notifying the admin - A copy of the data is sent to the admin via email using nodemailer for validation.

When a user visits the website, the fully-rendered static index.html with up-to-date data will be served. This reduces the server load and improves the page loading speed significantly as we have eliminated the need to perform API calls and client-side rendering for every page loads.

What if the data scraping fails?

One of the challenges of web scraping is the dynamic nature of the internet as a result of active development. A small tweak on the site's structure affecting our targeted HTML element could potentially render our data scraping script useless.

In the event of failed data scraping, the data scraping script will trigger an alert to be sent to the admin's email. The rendering of index.html and data caching will be aborted on the spot to prevent bad data from reaching the public, thus preventing the spread of misinformation.

While the project maintainer fixes the data scraping script, the data of the application could be outdated, if the data source updates the data. Well, fret not as this project comes with a handy admin API that allows you to keep the data up-to-date by manually updating the data. Tedious, but it works ;)

The admin API is basically a "forced update" trigger secured with API key authentication and rate limiting. Be sure to configure a secure ADMIN_API_KEY in the .env file to prevent the API from being misused.

API Reference

For detailed API documentation (both admin and data APIs), please refer the Github Wiki.

FAQ

I found a bug / have a cool idea. How can I contribute?

Feel free to file an issue with a respective title and description using the issue tracker and thank you for your passion!

Why does it only show data for Malaysia?

Each country has its own zoning system and probably more states/districts than Malaysia. I am incapable of studying and validating all the data, unfortunately.

Can I use this project for other visualization? (COVID-19 in other countries/other data)

Feel free to do so if it fits your requirement. Please refer the license section for more details.

I still have questions. Where do I ask?

Shoot me an email at [email protected].

License

This project is licensed under the MIT License. While you are free to use and/or redeploy the codes as a service/website, it must not:

• identify itself as being part of knowyourzone.xyz
• use the brand name and logo of KnowYourZone

All the associating image assets under the public/img directory and the brand name, KnowYourZone are copyrighted and therefore excluded from the MIT License. You should not include/use them as part of your service as you might confuse or mislead people if you do.

Author

Connect with me on LinkedIn or follow me on Github.

Data source

The data is sourced from the awesome Malaysiakini COVID-19 Tracker.

Disclaimer: knowyourzone.xyz is not affiliated, associated, maintained by, or in any way officially connected with malaysiakini.com.