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server.js
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server.js
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require('dotenv').config()
const debugSocket = require('debug')('server:socket')
const debugInterval1 = require('debug')('server:interval1')
const WebSocket = require('ws')
const express = require('express')
const http = require('http')
const uuid = require('uuid/v1')
const config = require('./config')
const Action = require('./module/Action')
const Payload = require('./module/Payload')
const Connected = require('./module/Connected')
const util = require('./static/util')
const port = config.port
const eventKey = config.eventKey
const readyStateKey = config.readyStateKey
const oneSec = 1000
/** @type {string[]} */
let userIds = []
/** @type {string[]} */
let payloads = []
const maxPayloads = 40
// ================================================================ Function
/**
* @param {Object} ws
* @param {string} key
* @param {string} data
* @param {function} successCb
* @param {function} errorCb
*/
function send (ws, key, data, successCb, errorCb) {
if (ws.readyState !== readyStateKey.open) return false
const action = new Action(key, data)
const actionStr = JSON.stringify(action)
ws.send(actionStr, (e) => {
if (e) {
debugSocket(e)
if (errorCb) errorCb()
} else {
if (successCb) successCb()
}
})
}
/**
* Generate unique playerId based on timestamp
*
* @returns {string}
*/
function getRandomUserId () {
let isExisting = true
let newId
while (isExisting) {
newId = uuid()
if (userIds.indexOf(newId) < 0) {
isExisting = false
}
}
return newId
}
/**
* @param {string} userId
*/
function removeUser (userId) {
const index = userIds.indexOf(userId)
if (index > -1) userIds.splice(index, 1)
}
/**
* @param {function} func
*/
function forEachClient (func) {
wss.clients.forEach((ws) => {
if (ws.readyState === readyStateKey.open) {
func(ws)
}
})
}
/**
* @param {Payload} payload
*/
function savePayload (payload) {
payloads.push(payload)
if (payloads.length > maxPayloads) {
payloads.shift()
}
}
// ================================================================ App
const app = express()
app.use(express.static('public'))
app.get('/', (req, res) => {
// response something
})
// Create a server by combining express and ws library via http:
const server = http.createServer(app)
const wss = new WebSocket.Server({ server })
server.listen(port, () => {
debugSocket('Server start on port', port)
})
/**
* @todo refactor
*/
wss.on('connection', (ws) => {
ws.on('message', (actionStr) => {
try {
const action = JSON.parse(actionStr)
switch (action.key) {
case eventKey.message:
const message = action.data
// save into payloads
const payload = new Payload(ws.id, message)
savePayload(payload)
// broadcast
forEachClient((ws) => {
send(ws, eventKey.newMessage, payload)
})
// log
debugSocket(`${util.short(ws.id)}: ${message}`)
break
default:
debugSocket('Invalid action', action)
break
}
} catch (e) {
debugSocket('Handle websocket event error', e)
}
})
ws.on('close', (e) => {
// remove
removeUser(ws.id)
// log
debugSocket(`userId: ${ws.id} is disconnected`)
})
ws.on('error', (e) => {
console.log(e)
console.log(e.stack)
})
// create new
const newUserId = getRandomUserId()
userIds.push(newUserId)
ws.id = newUserId
// send userId to user
send(
ws,
eventKey.userConnect,
new Connected(newUserId, payloads)
)
})
// ================================================================ setInterval
setInterval(() => {
// log
debugInterval1(`n users: ${userIds.length}, payloads.length: ${payloads.length}`)
}, oneSec)