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replace socket.io usage with WebSockets

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This commit is contained in:
Nick Krecklow 2020-05-05 16:49:01 -05:00
parent 2ee9c8b919
commit ca9e127e3e
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GPG Key ID: 5F149FDE156FFA94
10 changed files with 240 additions and 169 deletions
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3
assets/js/app.js
View File

@ -81,9 +81,6 @@ export class App {
document.getElementById('stat_totalPlayers').innerText = 0
document.getElementById('stat_networks').innerText = 0
// Modify page state to display loading overlay
this.caption.set('Lost connection!')
this.setPageReady(false)
}

159
assets/js/main.js
View File

@ -1,34 +1,107 @@
import { App } from './app'
import io from 'socket.io-client'
const app = new App()
document.addEventListener('DOMContentLoaded', function () {
const socket = io.connect({
reconnect: true,
reconnectDelay: 1000,
reconnectionAttempts: 10
})
const webSocket = new WebSocket('ws://' + location.host)
// The backend will automatically push data once connected
socket.on('connect', function () {
webSocket.onopen = () => {
app.caption.set('Loading...')
})
}
socket.on('disconnect', function () {
webSocket.onclose = (event) => {
app.handleDisconnect()
// Modify page state to display loading overlay
// Code 1006 denotes "Abnormal closure", most likely from the server or client losing connection
// See https://developer.mozilla.org/en-US/docs/Web/API/CloseEvent
// Treat other codes as active errors (besides connectivity errors) when displaying the message
if (event.code === 1006) {
app.caption.set('Lost connection!')
} else {
app.caption.set('Disconnected due to error.')
}
// Reset modified DOM structures
document.getElementById('big-graph-mobile-load-request').style.display = 'none'
})
socket.on('historyGraph', function (data) {
// TODO: Reconnect behavior
}
webSocket.onmessage = (message) => {
const payload = JSON.parse(message.data)
switch (payload.message) {
case 'init':
app.setPublicConfig(payload.config)
// Display the main page component
// Called here instead of syncComplete so the DOM can be drawn prior to the graphs being drawn
// Otherwise flot.js will cause visual alignment bugs
app.setPageReady(true)
// Allow the graphDisplayManager to control whether or not the historical graph is loaded
// Defer to isGraphVisible from the publicConfig to understand if the frontend will ever receive a graph payload
if (app.publicConfig.isGraphVisible) {
if (app.graphDisplayManager.isVisible) {
// Send request as a plain text string to avoid the server needing to parse JSON
// This is mostly to simplify the backend server's need for error handling
webSocket.send('requestHistoryGraph')
} else {
document.getElementById('big-graph-mobile-load-request').style.display = 'block'
}
}
payload.servers.forEach(app.addServer)
if (payload.mojangServices) {
app.mojangUpdater.updateStatus(payload.mojangServices)
}
// Init payload contains all data needed to render the page
// Alert the app it is ready
app.handleSyncComplete()
break
case 'updateServer': {
// The backend may send "update" events prior to receiving all "add" events
// A server has only been added once it's ServerRegistration is defined
// Checking undefined protects from this race condition
const serverRegistration = app.serverRegistry.getServerRegistration(payload.serverId)
if (serverRegistration) {
serverRegistration.updateServerStatus(payload, false, app.publicConfig.minecraftVersions)
}
// Use update payloads to conditionally append data to graph
// Skip any incoming updates if the graph is disabled
if (payload.updateHistoryGraph && app.graphDisplayManager.isVisible) {
// Update may not be successful, safely append 0 points
const playerCount = payload.result ? payload.result.players.online : 0
app.graphDisplayManager.addGraphPoint(serverRegistration.serverId, payload.timestamp, playerCount)
// Only redraw the graph if not mutating hidden data
if (serverRegistration.isVisible) {
app.graphDisplayManager.requestRedraw()
}
}
break
}
case 'updateMojangServices': {
app.mojangUpdater.updateStatus(payload)
break
}
case 'historyGraph': {
// Consider the graph visible since a payload has been received
// This is used for the manual graph load request behavior
app.graphDisplayManager.isVisible = true
app.graphDisplayManager.buildPlotInstance(data)
app.graphDisplayManager.buildPlotInstance(payload.graphData)
// Build checkbox elements for graph controls
let lastRowCounter = 0
@ -60,64 +133,10 @@ document.addEventListener('DOMContentLoaded', function () {
// Bind click event for updating graph data
app.graphDisplayManager.initEventListeners()
})
socket.on('add', function (data) {
data.forEach(app.addServer)
})
socket.on('update', function (data) {
// The backend may send "update" events prior to receiving all "add" events
// A server has only been added once it's ServerRegistration is defined
// Checking undefined protects from this race condition
const serverRegistration = app.serverRegistry.getServerRegistration(data.serverId)
if (serverRegistration) {
serverRegistration.updateServerStatus(data, false, app.publicConfig.minecraftVersions)
}
// Use update payloads to conditionally append data to graph
// Skip any incoming updates if the graph is disabled
if (data.updateHistoryGraph && app.graphDisplayManager.isVisible) {
// Update may not be successful, safely append 0 points
const playerCount = data.result ? data.result.players.online : 0
app.graphDisplayManager.addGraphPoint(serverRegistration.serverId, data.timestamp, playerCount)
// Only redraw the graph if not mutating hidden data
if (serverRegistration.isVisible) {
app.graphDisplayManager.requestRedraw()
break
}
}
})
socket.on('updateMojangServices', function (data) {
app.mojangUpdater.updateStatus(data)
})
socket.on('setPublicConfig', function (data) {
app.setPublicConfig(data)
// Display the main page component
// Called here instead of syncComplete so the DOM can be drawn prior to the graphs being drawn
// Otherwise flot.js will cause visual alignment bugs
app.setPageReady(true)
// Allow the graphDisplayManager to control whether or not the historical graph is loaded
// Defer to isGraphVisible from the publicConfig to understand if the frontend will ever receive a graph payload
if (data.isGraphVisible) {
if (app.graphDisplayManager.isVisible) {
socket.emit('requestHistoryGraph')
} else {
document.getElementById('big-graph-mobile-load-request').style.display = 'block'
}
}
})
// Fired once the backend has sent all requested data
socket.on('syncComplete', function () {
app.handleSyncComplete()
})
window.addEventListener('resize', function () {
app.percentageBar.redraw()
@ -128,7 +147,9 @@ document.addEventListener('DOMContentLoaded', function () {
document.getElementById('big-graph-mobile-load-request-button').addEventListener('click', function () {
// Send a graph data request to the backend
socket.emit('requestHistoryGraph')
// Send request as a plain text string to avoid the server needing to parse JSON
// This is mostly to simplify the backend server's need for error handling
webSocket.send('requestHistoryGraph')
// Hide the activation link to avoid multiple requests
document.getElementById('big-graph-mobile-load-request').style.display = 'none'

2
config.json
View File

@ -9,6 +9,6 @@
"pingAll": 3000,
"connectTimeout": 2500
},
"logToDatabase": false,
"logToDatabase": true,
"graphDuration": 86400000
}

30
lib/app.js
View File

@ -2,6 +2,7 @@ const Database = require('./database')
const MojangUpdater = require('./mojang')
const PingController = require('./ping')
const Server = require('./server')
const MessageOf = require('./message')
const config = require('../config')
const minecraftVersions = require('../minecraft_versions')
@ -36,7 +37,8 @@ class App {
handleClientConnection = (client) => {
if (config.logToDatabase) {
client.on('requestHistoryGraph', () => {
client.on('message', (message) => {
if (message === 'requestHistoryGraph') {
// Send historical graphData built from all serverRegistrations
const graphData = {}
@ -44,11 +46,18 @@ class App {
graphData[serverRegistration.serverId] = serverRegistration.graphData
})
client.emit('historyGraph', graphData)
// Send graphData in object wrapper to avoid needing to explicity filter
// any header data being appended by #MessageOf since the graph data is fed
// directly into the flot.js graphing system
client.send(MessageOf('historyGraph', {
graphData: graphData
}))
}
})
}
client.emit('setPublicConfig', (() => {
const initMessage = {
config: (() => {
// Remap minecraftVersion entries into name values
const minecraftVersionNames = {}
Object.keys(minecraftVersions).forEach(function (key) {
@ -62,17 +71,12 @@ class App {
minecraftVersions: minecraftVersionNames,
isGraphVisible: config.logToDatabase
}
})())
})(),
mojangServices: this.mojangUpdater.getLastUpdate(),
servers: this.serverRegistrations.map(serverRegistration => serverRegistration.getPingHistory())
}
// Send last Mojang update, if any
this.mojangUpdater.sendLastUpdate(client)
// Send pingHistory of all ServerRegistrations
client.emit('add', this.serverRegistrations.map(serverRegistration => serverRegistration.getPingHistory()))
// Always send last
// This tells the frontend to do final processing and render
client.emit('syncComplete')
client.send(MessageOf('init', initMessage))
}
}

6
lib/message.js Normal file
View File

@ -0,0 +1,6 @@
module.exports = function MessageOf (name, data) {
return JSON.stringify({
message: name,
...data
})
}

9
lib/mojang.js
View File

@ -1,6 +1,7 @@
const request = require('request')
const logger = require('./logger')
const MessageOf = require('./message')
const config = require('../config')
@ -65,14 +66,12 @@ class MojangUpdater {
if (this._hasUpdated) {
this._hasUpdated = false
this._app.server.broadcast('updateMojangServices', this._services)
this._app.server.broadcast(MessageOf('updateMojangServices', this._services))
}
}
sendLastUpdate (client) {
if (this._services) {
client.emit('updateMojangServices', this._services)
}
getLastUpdate () {
return this._services
}
handleServiceUpdate (url, color) {

5
lib/ping.js
View File

@ -4,6 +4,7 @@ const minecraftJavaPing = require('mc-ping-updated')
const minecraftBedrockPing = require('mcpe-ping-fixed')
const logger = require('./logger')
const MessageOf = require('./message')
const config = require('../config')
@ -125,7 +126,9 @@ class PingController {
// Generate a combined update payload
// This includes any modified fields and flags used by the frontend
// This will not be cached and can contain live metadata
this._app.server.broadcast('update', serverRegistration.getUpdate(timestamp, resp, err, version, updateHistoryGraph))
const updateMessage = serverRegistration.getUpdate(timestamp, resp, err, version, updateHistoryGraph)
this._app.server.broadcast(MessageOf('updateServer', updateMessage))
}
}

77
lib/server.js
View File

@ -1,8 +1,8 @@
const http = require('http')
const WebSocket = require('ws')
const finalHttpHandler = require('finalhandler')
const serveStatic = require('serve-static')
const io = require('socket.io')
const logger = require('./logger')
@ -12,52 +12,65 @@ function getRemoteAddr (req) {
class Server {
constructor (clientSocketHandler) {
this._clientSocketHandler = clientSocketHandler
this._connectedSockets = 0
this.createHttpServer()
this.createWebSocketServer(clientSocketHandler)
}
this._http = http.createServer(this.handleHttpRequest)
createHttpServer () {
const distServeStatic = serveStatic('dist/')
const faviconsServeStatic = serveStatic('favicons/')
this._distServeStatic = serveStatic('dist/')
this._faviconsServeStatic = serveStatic('favicons/')
this._http = http.createServer((req, res) => {
logger.log('info', '%s requested: %s', getRemoteAddr(req), req.url)
// Attempt to handle req using distServeStatic, otherwise fail over to faviconServeStatic
// If faviconServeStatic fails, pass to finalHttpHandler to terminate
distServeStatic(req, res, () => {
faviconsServeStatic(req, res, finalHttpHandler(req, res))
})
})
}
createWebSocketServer (proxyClientSocketHandler) {
this._wss = new WebSocket.Server({
server: this._http
})
this._wss.on('connection', (client, req) => {
logger.log('info', '%s connected, total clients: %d', getRemoteAddr(req), this.getConnectedClients())
// Bind disconnect event for logging
client.on('close', () => {
logger.log('info', '%s disconnected, total clients: %d', getRemoteAddr(req), this.getConnectedClients())
})
// Pass client off to proxy handler
proxyClientSocketHandler(client)
})
}
listen (host, port) {
this._http.listen(port, host)
this._io = io.listen(this._http)
this._io.on('connect', this.handleClientSocket)
logger.log('info', 'Started on %s:%d', host, port)
}
broadcast (event, payload) {
this._io.sockets.emit(event, payload)
broadcast (payload) {
this._wss.clients.forEach(client => {
if (client.readyState === WebSocket.OPEN) {
client.send(payload)
}
handleHttpRequest = (req, res) => {
logger.log('info', '%s requested: %s', getRemoteAddr(req), req.url)
// Attempt to handle req using distServeStatic, otherwise fail over to faviconServeStatic
// If faviconServeStatic fails, pass to finalHttpHandler to terminate
this._distServeStatic(req, res, () => {
this._faviconsServeStatic(req, res, finalHttpHandler(req, res))
})
}
handleClientSocket = (client) => {
this._connectedSockets++
logger.log('info', '%s connected, total clients: %d', getRemoteAddr(client.request), this._connectedSockets)
// Bind disconnect event for logging
client.on('disconnect', () => {
this._connectedSockets--
logger.log('info', '%s disconnected, total clients: %d', getRemoteAddr(client.request), this._connectedSockets)
getConnectedClients () {
let count = 0
this._wss.clients.forEach(client => {
if (client.readyState === WebSocket.OPEN) {
count++
}
})
// Pass client off to proxy handler
this._clientSocketHandler(client)
return count
}
}

30
package-lock.json generated
View File

@ -1836,6 +1836,15 @@
"integrity": "sha1-JuYe0UIvtw3ULm42cp7VHYVf6Nk=",
"dev": true
},
"bufferutil": {
"version": "4.0.1",
"resolved": "https://registry.npmjs.org/bufferutil/-/bufferutil-4.0.1.tgz",
"integrity": "sha512-xowrxvpxojqkagPcWRQVXZl0YXhRhAtBEIq3VoER1NH5Mw1n1o0ojdspp+GS2J//2gCVyrzQDApQ4unGF+QOoA==",
"optional": true,
"requires": {
"node-gyp-build": "~3.7.0"
}
},
"bufferview": {
"version": "1.0.1",
"resolved": "https://registry.npmjs.org/bufferview/-/bufferview-1.0.1.tgz",
@ -5876,6 +5885,12 @@
"integrity": "sha512-sol30LUpz1jQFBjOKwbjxijiE3b6pjd74YwfD0fJOKPjF+fONKb2Yg8rYgS6+bK6VDl+/wfr4IYpC7jDzLUIfw==",
"dev": true
},
"node-gyp-build": {
"version": "3.7.0",
"resolved": "https://registry.npmjs.org/node-gyp-build/-/node-gyp-build-3.7.0.tgz",
"integrity": "sha512-L/Eg02Epx6Si2NXmedx+Okg+4UHqmaf3TNcxd50SF9NQGcJaON3AtU++kax69XV7YWz4tUspqZSAsVofhFKG2w==",
"optional": true
},
"node-libs-browser": {
"version": "2.2.1",
"resolved": "https://registry.npmjs.org/node-libs-browser/-/node-libs-browser-2.2.1.tgz",
@ -8782,6 +8797,15 @@
"integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
"dev": true
},
"utf-8-validate": {
"version": "5.0.2",
"resolved": "https://registry.npmjs.org/utf-8-validate/-/utf-8-validate-5.0.2.tgz",
"integrity": "sha512-SwV++i2gTD5qh2XqaPzBnNX88N6HdyhQrNNRykvcS0QKvItV9u3vPEJr+X5Hhfb1JC0r0e1alL0iB09rY8+nmw==",
"optional": true,
"requires": {
"node-gyp-build": "~3.7.0"
}
},
"util": {
"version": "0.11.1",
"resolved": "https://registry.npmjs.org/util/-/util-0.11.1.tgz",
@ -9041,9 +9065,9 @@
}
},
"ws": {
"version": "7.2.3",
"resolved": "https://registry.npmjs.org/ws/-/ws-7.2.3.tgz",
"integrity": "sha512-HTDl9G9hbkNDk98naoR/cHDws7+EyYMOdL1BmjsZXRUjf7d+MficC4B7HLUPlSiho0vg+CWKrGIt/VJBd1xunQ=="
"version": "7.2.5",
"resolved": "https://registry.npmjs.org/ws/-/ws-7.2.5.tgz",
"integrity": "sha512-C34cIU4+DB2vMyAbmEKossWq2ZQDr6QEyuuCzWrM9zfw1sGc0mYiJ0UnG9zzNykt49C2Fi34hvr2vssFQRS6EA=="
},
"xml-name-validator": {
"version": "3.0.0",

8
package.json
View File

@ -9,9 +9,9 @@
"mcpe-ping-fixed": "0.0.3",
"request": "2.88.2",
"serve-static": "^1.14.1",
"socket.io": "2.3.0",
"sqlite3": "4.1.1",
"winston": "^2.0.0"
"winston": "^2.0.0",
"ws": "^7.2.5"
},
"repository": {
"type": "git",
@ -44,5 +44,9 @@
"scripts": {
"build": "eslint assets/js/*.js && parcel build assets/html/index.html",
"dev": "parcel build assets/html/index.html --no-minify"
},
"optionalDependencies": {
"bufferutil": "^4.0.1",
"utf-8-validate": "^5.0.2"
}
}