07_tcp_tls_session_client.js

const host = '127.0.0.1'
const tcpPort = 3002

const oneSecond = 1000
const wait = ms => new Promise(f => setTimeout(f, ms))

const fs = require('fs')
const usingCerts = n => { return {
	key: fs.readFileSync(`${n}_key.pem`), 
	cert: fs.readFileSync(`${n}_cert.pem`), 
}}

const sessionId = s => s.slice(0, 2).toString('hex') + '...' + s.slice(46, 48).toString('hex')

const tls = require('tls')
var session
const connect = (p, h, o = {}) => {
	let socket = tls.connect(p, h, { ...o, session: session })
	.on('secureConnect', () => {
		console.log(`agreed TLS protocol ${socket.getProtocol()}`)
		if (socket.isSessionReused()) console.log(`reusing session ${sessionId(session)}`)

		if (socket.authorized) console.log("authorized by CA")
		else console.log(`not authorized: ${socket.authorizationError}`)

		console.log('connected to server')
		socket.write('hello server')
	})
	.once('session', s => session = s)
	.on('data', d => console.log(`server says: ${d}`))
	.on('close', () => {
		console.log('connection interrupted')
		wait(oneSecond).then(() => connect(p, h, o))
	})
}
connect(tcpPort, host, usingCerts("client"))