Create Websocket server locally

calendar Sep 7, 2022 · 1 min read · Cloud Demo GCP AWS  ·
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Install the ws package

1npm i ws

Create a server.js file and add the following contents

 1import { WebSocketServer } from "ws";
 2
 3const wss = new WebSocketServer({ port: 8099 })
 4wss.on('connection', client => {
 5    console.log(`Connected New Client : Total size ${wss.clients.size}`);
 6    wss.clients.forEach(c => {
 7        c.send(`{"connected_devices": ${wss.clients.size}}`)
 8    })
 9
10    client.on('message', (data, isBinary) => {
11        [...wss.clients]
12            .filter(c => c != client)
13            .forEach(c => {
14                c.send(`{"data": "${data}"}`)
15            })
16    })
17
18    client.on('close', () => {
19        console.log(`Devices Disconnected. Total size ${wss.clients.size}`);
20        [...wss.clients]
21            .filter(c => c != client)
22            .forEach(c => {
23                c.send(`{"connected_devices": ${wss.clients.size}}`)
24            })
25    })
26})

Run server locally

1node server.js

For containerized app

Create a dockerignore file

1node_modules
2npm-debug.log

Create a docker file Dockerfile

1FROM node:16-alpine
2WORKDIR /usr/src/app
3COPY package*.json ./
4RUN npm ci --only=production
5COPY . .
6EXPOSE 8099
7CMD [ "node", "server.js" ]

Build image

1docker build -t datavedam-websocket:latest .

Run container locally

1docker run -p 8099:8099 datavedam-websocket:latest

Deploy a container to Cloud run

To deploy container to cloud run, Follow the docs