Server Emit to Specific Socket
Video Lecture
Description
Emit a message to a specific socket id
./src/server/luckyNumbersGame.ts
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15 | export default class LuckyNumbersGame {
public LuckyNumbers: { [id: string]: number } = {}
constructor() {}
public GetWinners(number: number): string[] {
let ret: string[] = []
for (let key in this.LuckyNumbers) {
if (number === this.LuckyNumbers[key]) {
ret.push(key)
}
}
return ret
}
}
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./src/server/server.ts
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68 | import express from 'express'
import path from 'path'
import http from 'http'
import socketIO from 'socket.io'
import LuckyNumbersGame from './luckyNumbersGame'
const port: number = 3000
class App {
private server: http.Server
private port: number
private io: socketIO.Server
private game: LuckyNumbersGame
constructor(port: number) {
this.port = port
const app = express()
app.use(express.static(path.join(__dirname, '../client')))
this.server = new http.Server(app)
this.io = new socketIO.Server(this.server)
this.game = new LuckyNumbersGame()
this.io.on('connection', (socket: socketIO.Socket) => {
console.log('a user connected : ' + socket.id)
this.game.LuckyNumbers[socket.id] = Math.floor(Math.random() * 10)
socket.emit(
'message',
'Hello ' +
socket.id +
', your lucky number is ' +
this.game.LuckyNumbers[socket.id]
)
socket.broadcast.emit(
'message',
'Everybody, say hello to ' + socket.id
)
socket.on('disconnect', function () {
console.log('socket disconnected : ' + socket.id)
})
})
setInterval(() => {
let randomNumber: number = Math.floor(Math.random() * 10)
let winners: string[] = this.game.GetWinners(randomNumber)
if (winners.length) {
winners.forEach((w) => {
this.io.to(w).emit('message', '*** You are the winner ***')
})
}
this.io.emit('random', randomNumber)
}, 1000)
}
public Start() {
this.server.listen(this.port)
console.log(`Server listening on port ${this.port}.`)
}
}
new App(port).Start()
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./src/client/client.ts
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19 | class Client {
private socket: SocketIOClient.Socket
constructor() {
this.socket = io()
this.socket.on('message', function (message: any) {
console.log(message)
document.body.innerHTML += message + '<br/>'
})
this.socket.on('random', function (message: any) {
console.log(message)
document.body.innerHTML += 'Winning number is ' + message + '<br/>'
})
}
}
const client = new Client()
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