LinuxFoundationX LFW111x - Introduction to Node.js

Link

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash

/1-mock-static-server
  /static
    /app.js
    /index.html

npm install -g serve

cd 1-mock-static-server/
serve -p 5050 static

/2-mock-zero-dependency
  /server.js
  /static
    /app.js
    /index.html

cd 2-mock-zero-dependency/
node server.js

The frontend application starting with serve

cd 2-mock-zero-dependency/
serve -p 5050 static

Fastify

/3-mock-fastify
  /mock-srv
    (scaffolding create with `npm init fastify`)
  /static
    /app.js
    /index.html

cd 3-mock-fastify/mock-srv
npm install

cd 3-mock-fastify/mock-srv
npm start

The frontend application starting with serve

cd 3-mock-fastify/
serve -p 5050 static

the key concept is Web Socket

• WebSockets API
• WebSocket Fastify

/4-realtime
  /mock-srv
    (scaffolding create with `npm init fastify`)
  /static
    /app.js
    /index.html

cd 4-realtime/mock-srv
npm install

cd 4-realtime/mock-srv
npm start

The frontend application starting with serve

cd 4-realtime/
serve -p 5050 static

testing from terminal

node -e "http.request('http://localhost:3000/orders/A1', { method: 'POST', headers: {'content-type': 'application/json'}}, (res) => res.pipe(process.stdout)).end(JSON.stringify({amount: 10}))"

the frontend application retrieve the updated data for the order A1

Create a CLI tool to send request to the server and update the order

/5-cli-tool
  /mock-srv
    (scaffolding create with `npm init fastify`)
  /static
    /app.js
    /index.html

cd 5-cli
npm link

To use the CLI you need started the server and the frontend application as described in the previous sections. Next you can try the cli to automate the update of the order.

5-cli <id> <amount>

# Example
5-cli A1 10