Minetrack/lib/ping.js

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const dns = require('dns')
const minecraftJavaPing = require('mc-ping-updated')
const minecraftBedrockPing = require('mcpe-ping-fixed')
const logger = require('./logger')
const MessageOf = require('./message')
const config = require('../config')
function ping (host, port, type, timeout, callback, version) {
switch (type) {
case 'PC':
unfurlSrv(host, port, (host, port) => {
minecraftJavaPing(host, port || 25565, (err, res) => {
if (err) {
callback(err)
} else {
const payload = {
players: {
online: capPlayerCount(host, parseInt(res.players.online))
},
version: parseInt(res.version.protocol)
}
// Ensure the returned favicon is a data URI
if (res.favicon && res.favicon.startsWith('data:image/')) {
payload.favicon = res.favicon
}
callback(null, payload)
}
}, timeout, version)
})
break
case 'PE':
minecraftBedrockPing(host, port || 19132, (err, res) => {
if (err) {
callback(err)
} else {
callback(null, {
players: {
online: capPlayerCount(host, parseInt(res.currentPlayers))
}
})
}
}, timeout)
break
default:
throw new Error('Unsupported type: ' + type)
}
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}
function unfurlSrv (hostname, port, callback) {
dns.resolveSrv('_minecraft._tcp.' + hostname, (_, records) => {
if (!records || records.length < 1) {
callback(hostname, port)
} else {
callback(records[0].name, records[0].port)
}
})
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}
// player count can be up to 1^32-1, which is a massive scale and destroys browser performance when rendering graphs
// Artificially cap and warn to prevent propogating garbage
function capPlayerCount (host, playerCount) {
const maxPlayerCount = 250000
if (playerCount !== Math.min(playerCount, maxPlayerCount)) {
logger.log('warn', '%s returned a player count of %d, Minetrack has capped it to %d to prevent browser performance issues with graph rendering. If this is in error, please edit maxPlayerCount in ping.js!', host, playerCount, maxPlayerCount)
return maxPlayerCount
} else if (playerCount !== Math.max(playerCount, 0)) {
logger.log('warn', '%s returned an invalid player count of %d, setting to 0.', host, playerCount)
return 0
}
return playerCount
}
class PingController {
constructor (app) {
this._app = app
}
schedule () {
setInterval(this.pingAll, config.rates.pingAll)
this.pingAll()
}
pingAll = () => {
for (const serverRegistration of this._app.serverRegistrations) {
const version = serverRegistration.getNextProtocolVersion()
ping(serverRegistration.data.ip, serverRegistration.data.port, serverRegistration.data.type, config.rates.connectTimeout, (err, resp) => {
if (err) {
logger.log('error', 'Failed to ping %s: %s', serverRegistration.data.ip, err.message)
}
this.handlePing(serverRegistration, resp, err, version)
}, version.protocolId)
}
}
handlePing (serverRegistration, resp, err, version) {
const timestamp = new Date().getTime()
serverRegistration.addPing(timestamp, resp)
let updateHistoryGraph = false
if (config.logToDatabase) {
const playerCount = resp ? resp.players.online : 0
// Log to database
this._app.database.insertPing(serverRegistration.data.ip, timestamp, playerCount)
if (serverRegistration.addGraphPoint(resp !== undefined, playerCount, timestamp)) {
updateHistoryGraph = true
}
}
// 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
const updateMessage = serverRegistration.getUpdate(timestamp, resp, err, version, updateHistoryGraph)
this._app.server.broadcast(MessageOf('updateServer', updateMessage))
}
}
module.exports = PingController