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latency_client.js

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latency_client.js

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const io = require('socket.io-client')

const port = process.env.PORT || 5000;

const socket = io('http://localhost:' + port);

let last;

function send () {

last = new Date();

socket.emit('ping_from_client');

}

socket.on('connect', () => {

console.log(`connect ${socket.id}`);

send();

});

socket.on('disconnect', () => {

console.log(`disconnect ${socket.id}`);

});

socket.on('pong_from_server', () => {

const latency = new Date() - last;

console.log('latency is ' + latency + ' ms');

setTimeout(send, 1000);

});