Minetrack/lib/servers.js

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const config = require('../config')
const minecraftVersions = require('../minecraft_versions')
class ServerRegistration {
lastFavicon
versions = []
recordData
graphData = []
constructor (data) {
this.data = data
this._pingHistory = []
}
getUpdate (timestamp, resp, err, version) {
const update = {
info: {
name: this.data.name,
timestamp: timestamp
}
}
if (resp) {
if (resp.version && this.updateProtocolVersionCompat(resp.version, version.protocolId, version.protocolIndex)) {
// Append an updated version listing
update.versions = this.versions
}
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if (config.logToDatabase && (!this.recordData || resp.players.online > this.recordData.playerCount)) {
this.recordData = {
playerCount: resp.players.online,
timestamp: timestamp
}
// Append an updated recordData
update.recordData = this.recordData
}
// Compare against this.data.favicon to support favicon overrides
const newFavicon = resp.favicon || this.data.favicon
if (this.updateFavicon(newFavicon)) {
// Append an updated favicon
update.favicon = newFavicon
}
// Append a result object
// This filters out unwanted data from resp
update.result = {
players: resp.players
}
} else if (err) {
// Append a filtered copy of err
// This ensures any unintended data is not leaked
update.error = this.filterError(err)
}
return update
}
addPing (timestamp, resp) {
const ping = {
timestamp: timestamp
}
if (resp) {
// Append a result object
// This filters out unwanted data from resp
ping.result = {
players: {
online: resp.players.online
}
}
}
this._pingHistory.push(ping)
// Trim pingHistory to avoid memory leaks
if (this._pingHistory.length > 72) {
this._pingHistory.shift()
}
}
getPingHistory () {
if (this._pingHistory.length > 0) {
const pingHistory = []
for (let i = 0; i < this._pingHistory.length - 1; i++) {
pingHistory[i] = this._pingHistory[i]
}
// Insert the latest update manually into the array
// This is a mutated copy of the last update to contain live metadata
// The metadata is used by the frontend for rendering
const lastPing = this._pingHistory[this._pingHistory.length - 1]
const payload = {
info: {
name: this.data.name
},
timestamp: lastPing.timestamp,
versions: this.versions,
recordData: this.recordData,
favicon: this.lastFavicon
}
// Conditionally append to avoid defining fields with undefined values
if (lastPing.result) {
payload.result = lastPing.result
} else if (lastPing.error) {
payload.error = lastPing.error
}
// Insert the reconstructed update as the last entry
// pingHistory is already sorted during its copy from _pingHistory
pingHistory.push(payload)
return pingHistory
}
return [{
error: {
message: 'Waiting...',
placeholder: true
},
timestamp: new Date().getTime(),
info: {
name: this.data.name
},
recordData: this.recordData
}]
}
loadGraphPoints (points) {
// Filter pings so each result is a minute apart
const minutePoints = []
let lastTimestamp = 0
for (const point of points) {
// 0 is the index of the timestamp
if (point[0] - lastTimestamp >= 60 * 1000) {
// This check tries to smooth out randomly dropped pings
// By default only filter pings that are online (playerCount > 0)
// This will keep looking forward until it finds a ping that is online
// If it can't find one within a reasonable timeframe, it will select a failed ping
if (point[0] - lastTimestamp >= 120 * 1000 || point[1] > 0) {
minutePoints.push(point)
lastTimestamp = point[0]
}
}
}
if (minutePoints.length > 0) {
this.graphData = minutePoints
// Select the last entry to use for lastGraphDataPush
this._lastGraphDataPush = minutePoints[minutePoints.length - 1][0]
}
}
addGraphPoint (isSuccess, playerCount, timestamp) {
// If the ping failed, then to avoid destroying the graph, ignore it
// However if it's been too long since the last successful ping, push it anyways
if (this._lastGraphDataPush) {
const timeSince = timestamp - this._lastGraphDataPush
if ((isSuccess && timeSince < 60 * 1000) || (!isSuccess && timeSince < 70 * 1000)) {
return false
}
}
this.graphData.push([timestamp, playerCount])
this._lastGraphDataPush = timestamp
// Trim old graphPoints according to graphDuration
const filterTimestamp = new Date().getTime() - config.graphDuration
this.graphData = this.graphData.filter(point => point[0] >= filterTimestamp)
return true
}
findNewGraphPeak () {
let index = -1
for (let i = 0; i < this.graphData.length; i++) {
const point = this.graphData[i]
if (index === -1 || point[1] > this.graphData[index][1]) {
index = i
}
}
if (index >= 0) {
const lastGraphPeakIndex = this._graphPeakIndex
this._graphPeakIndex = index
return index !== lastGraphPeakIndex
} else {
this._graphPeakIndex = undefined
return false
}
}
getGraphPeak () {
if (this._graphPeakIndex === undefined) {
return
}
const graphPeak = this.graphData[this._graphPeakIndex]
return {
playerCount: graphPeak[1],
timestamp: graphPeak[0]
}
}
updateFavicon (favicon) {
if (favicon && favicon !== this.lastFavicon) {
this.lastFavicon = favicon
return true
}
return false
}
updateProtocolVersionCompat (incomingId, outgoingId, protocolIndex) {
// If the result version matches the attempted version, the version is supported
const isSuccess = incomingId === outgoingId
const indexOf = this.versions.indexOf(protocolIndex)
// Test indexOf to avoid inserting previously recorded protocolIndex values
if (isSuccess && indexOf < 0) {
this.versions.push(protocolIndex)
// Sort versions in ascending order
// This matches protocol ids to Minecraft versions release order
this.versions.sort((a, b) => a - b)
return true
} else if (!isSuccess && indexOf >= 0) {
this.versions.splice(indexOf, 1)
return true
}
return false
}
getNextProtocolVersion () {
// Minecraft Bedrock Edition does not have protocol versions
if (this.data.type === 'PE') {
return {
protocolId: 0,
protocolIndex: 0
}
}
const protocolVersions = minecraftVersions[this.data.type]
if (typeof this._nextProtocolIndex === 'undefined' || this._nextProtocolIndex + 1 >= protocolVersions.length) {
this._nextProtocolIndex = 0
} else {
this._nextProtocolIndex++
}
return {
protocolId: protocolVersions[this._nextProtocolIndex].protocolId,
protocolIndex: this._nextProtocolIndex
}
}
filterError (err) {
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let message = 'Unknown error'
// Attempt to match to the first possible value
for (const key of ['message', 'description', 'errno']) {
if (err[key]) {
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message = err[key]
break
}
}
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// Trim the message if too long
if (message.length > 28) {
message = message.substring(0, 28) + '...'
}
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return {
message: message
}
}
}
module.exports = ServerRegistration