Add API to get server status information.

package-lock.json

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+              "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+              "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+              "dev": true,
+              "requires": {
+                "p-limit": "^2.0.0"
+              }
+            },
+            "path-exists": {
+              "version": "3.0.0",
+              "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+              "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+              "dev": true
             }
           }
         },

package.json

@@ -57,7 +57,7 @@
     "@types/lodash": "^4.14.160",
     "@types/mocha": "^8.0.3",
     "@types/node": "^12.12.54",
-    "@types/react": "^16.9.46",
+    "@types/react": "^16.9.48",
     "@types/react-dom": "^16.9.8",
     "@types/react-redux": "^7.1.9",
     "@types/react-transition-group": "^4.4.0",
@@ -65,8 +65,8 @@
     "@types/tar-fs": "^2.0.0",
     "@types/triple-beam": "^1.3.2",
     "@types/winreg": "^1.2.30",
-    "@typescript-eslint/eslint-plugin": "^3.10.0",
-    "@typescript-eslint/parser": "^3.10.0",
+    "@typescript-eslint/eslint-plugin": "^3.10.1",
+    "@typescript-eslint/parser": "^3.10.1",
     "chai": "^4.2.0",
     "cross-env": "^7.0.2",
     "electron": "^9.2.1",
@@ -77,7 +77,7 @@
     "eslint": "^7.7.0",
     "eslint-plugin-react": "^7.20.6",
     "helios-distribution-types": "1.0.0-pre.1",
-    "mocha": "^8.1.1",
+    "mocha": "^8.1.2",
     "nock": "^13.0.4",
     "react": "^16.13.0",
     "react-dom": "^16.13.0",

src/common/util/ServerStatusUtil.ts

@@ -0,0 +1,262 @@
+/* eslint-disable no-control-regex */
+import { connect } from 'net'
+import { LoggerUtil } from 'common/logging/loggerutil'
+
+const logger = LoggerUtil.getLogger('ServerStatusUtil')
+
+export interface ServerStatus {
+    version: {
+        name: string
+        protocol: number
+    }
+    players: {
+        max: number
+        online: number
+        sample: {
+            name: string
+            id: string
+        }[]
+    }
+    description: {
+        text: string
+    }
+    favicon: string
+    modinfo?: {             // Only for modded servers
+        type: string        // Ex. FML
+        modList: {
+            modid: string
+            version: string
+        }[]
+    }
+}
+
+/**
+ * Utility Class to construct a packet conforming to Minecraft's
+ * protocol. All data types are BE except VarInt and VarLong.
+ * 
+ * @see https://wiki.vg/Protocol
+ */
+class ServerBoundPacket {
+
+    private buffer: number[]
+
+    protected constructor() {
+        this.buffer = []
+    }
+
+    public static build(): ServerBoundPacket {
+        return new ServerBoundPacket()
+    }
+
+    /**
+     * Packet is prefixed with its data length as a VarInt.
+     * 
+     * @see https://wiki.vg/Protocol#Packet_format
+     */
+    public toBuffer(): Buffer {
+        const finalizedPacket = new ServerBoundPacket()
+        finalizedPacket.writeVarInt(this.buffer.length)
+        finalizedPacket.writeBytes(...this.buffer)
+
+        return Buffer.from(finalizedPacket.buffer)
+    }
+
+    public writeBytes(...bytes: number[]): ServerBoundPacket {
+        this.buffer.push(...bytes)
+        return this
+    }
+
+    /**
+     * @see https://wiki.vg/Protocol#VarInt_and_VarLong
+     */
+    public writeVarInt(value: number): ServerBoundPacket {
+        do {
+            let temp = value & 0b01111111
+
+            value >>>= 7
+
+            if (value != 0) {
+                temp |= 0b10000000
+            }
+
+            this.writeBytes(temp)
+        } while (value != 0)
+
+        return this
+    }
+
+    /**
+     * Strings are prefixed with their length as a VarInt.
+     * 
+     * @see https://wiki.vg/Protocol#Data_types
+     */
+    public writeString(string: string): ServerBoundPacket {
+        this.writeVarInt(string.length)
+        for (let i=0; i<string.length; i++) {
+            this.writeBytes(string.codePointAt(i)!)
+        }
+
+        return this
+    }
+
+    public writeUnsignedShort(short: number): ServerBoundPacket {
+        const buf = Buffer.alloc(2)
+        buf.writeUInt16BE(short, 0)
+        this.writeBytes(...buf)
+
+        return this
+    }
+ 
+}
+
+/**
+ * Utility Class to read a client-bound packet conforming to
+ * Minecraft's protocol. All data types are BE except VarInt
+ * and VarLong.
+ * 
+ * @see https://wiki.vg/Protocol
+ */
+class ClientBoundPacket {
+
+    private buffer: number[]
+
+    constructor(buffer: Buffer) {
+        this.buffer = [...buffer]
+    }
+
+    public readByte(): number {
+        return this.buffer.shift()!
+    }
+
+    public readBytes(length: number): number[] {
+        const value = this.buffer.slice(0, length)
+        this.buffer.splice(0, length)
+        return value
+    }
+
+    public readVarInt(): number {
+
+        let numRead = 0
+        let result = 0
+        let read
+
+        do {
+            read = this.readByte()
+            const value = (read & 0b01111111)
+            result |= (value << (7 * numRead))
+
+            numRead++
+            if (numRead > 5) {
+                throw new Error('VarInt is too big')
+            }
+        } while ((read & 0b10000000) != 0)
+
+        return result
+    }
+
+    public readString(): string {
+        const length = this.readVarInt()
+        const data = this.readBytes(length)
+
+        let value = ''
+
+        for (let i=0; i<data.length; i++) {
+            value += String.fromCharCode(data[i])
+        }
+
+        return value
+    }
+
+}
+
+/**
+ * Get the handshake packet.
+ * 
+ * @param protocol The client's protocol version.
+ * @param address The server address.
+ * @param port The server port.
+ * 
+ * @see https://wiki.vg/Server_List_Ping#Handshake
+ */
+function getHandshakePacket(protocol: number, address: string, port: number): Buffer {
+
+    return ServerBoundPacket.build()
+        .writeVarInt(0x00)         // Packet Id 
+        .writeVarInt(protocol)
+        .writeString(address)
+        .writeUnsignedShort(port)
+        .writeVarInt(1)            // State, 1 = status
+        .toBuffer()
+}
+
+/**
+ * Get the request packet.
+ * 
+ * @see https://wiki.vg/Server_List_Ping#Request
+ */
+function getRequestPacket(): Buffer {
+
+    return ServerBoundPacket.build()
+        .writeVarInt(0x00)
+        .toBuffer()
+}
+
+export function getServerStatus(protocol: number, address: string, port = 25565): Promise<ServerStatus | null> {
+
+    return new Promise((resolve, reject) => {
+
+        const socket = connect(port, address, () => {
+            socket.write(getHandshakePacket(protocol, address, port))
+            socket.write(getRequestPacket())
+        })
+
+        socket.setTimeout(2500, () => {
+            socket.destroy()
+            logger.error(`Server Status Socket timed out (${address}:${port})`)
+            reject(new Error(`Server Status Socket timed out (${address}:${port})`))
+        })
+
+        socket.on('data', (data) => {
+
+            const inboundPacket = new ClientBoundPacket(data)
+
+            // eslint-disable-next-line @typescript-eslint/no-unused-vars
+            const packetLength = inboundPacket.readVarInt() // First VarInt is packet length.
+            const packetType = inboundPacket.readVarInt()   // Second VarInt is packet type.
+
+            if(packetType !== 0x00) {
+                // TODO
+                socket.destroy()
+                reject(new Error(`Invalid response. Expected packet type ${0x00}, received ${packetType}!`))
+                return
+            }
+
+            const res = inboundPacket.readString() // Remainder of Buffer is the server status json.
+
+            socket.end()
+            resolve(JSON.parse(res))
+        })
+
+        socket.on('error', (err: NodeJS.ErrnoException) => {
+            socket.destroy()
+
+            if(err.code === 'ENOTFOUND') {
+                // ENOTFOUND = Unable to resolve.
+                logger.error(`Server ${address}:${port} not found!`)
+                resolve(null)
+                return
+            } else if(err.code === 'ECONNREFUSED') {
+                // ECONNREFUSED = Unable to connect to port.
+                logger.error(`Server ${address}:${port} refused to connect, is the port correct?`)
+                resolve(null)
+                return
+            } else {
+                logger.error(`Error trying to pull server status (${address}:${port}})`, err)
+                resolve(null)
+                return
+            }
+        })
+
+    })
+
+}

src/renderer/components/Application.tsx

@@ -18,6 +18,7 @@ import Overlay from './overlay/Overlay'
 import { OverlayPushAction, OverlayActionDispatch } from '../redux/actions/overlayActions'
 
 import { DistributionAPI } from 'common/distribution/distribution'
+import { getServerStatus } from 'common/util/ServerStatusUtil'
 
 import './Application.css'
 
@@ -129,6 +130,8 @@ class Application extends React.Component<ApplicationProps & typeof mapDispatch,
                             const distro = new DistributionAPI('C:\\Users\\user\\AppData\\Roaming\\Helios Launcher')
                             const x = await distro.testLoad()
                             console.log(x)
+                            const serverStatus = await getServerStatus(47, 'mc.westeroscraft.com', 25565)
+                            console.log(serverStatus)
                         }
                     })
                     this.props.pushGenericOverlay({

src/renderer/components/overlay/generic-overlay/GenericOverlay.tsx

@@ -2,6 +2,8 @@ import * as React from 'react'
 import { connect } from 'react-redux'
 import { OverlayActionDispatch } from '../../../redux/actions/overlayActions'
 
+import { LoggerUtil } from 'common/logging/loggerutil'
+
 import './GenericOverlay.css'
 
 export interface GenericOverlayProps {
@@ -22,6 +24,8 @@ type InternalGenericOverlayProps = GenericOverlayProps & typeof mapDispatch
 
 class GenericOverlay extends React.Component<InternalGenericOverlayProps> {
 
+    private readonly logger = LoggerUtil.getLogger('GenericOverlay')
+
     private getAcknowledgeText = (): string => {
         return this.props.acknowledgeText || 'OK'
     }
@@ -32,14 +36,22 @@ class GenericOverlay extends React.Component<InternalGenericOverlayProps> {
 
     private onAcknowledgeClick = async (event: React.MouseEvent<HTMLButtonElement, MouseEvent>): Promise<void> => {
         if(this.props.acknowledgeCallback) {
-            await this.props.acknowledgeCallback(event)
+            try {
+                await this.props.acknowledgeCallback(event)
+            } catch(err) {
+                this.logger.error('Uncaught error in acknowledgement', err)
+            }
         }
         this.props.popOverlayContent()
     }
 
     private onDismissClick = async (event: React.MouseEvent<HTMLButtonElement, MouseEvent>): Promise<void> => {
         if(this.props.dismissCallback) {
-            await this.props.dismissCallback(event)
+            try {
+                await this.props.dismissCallback(event)
+            } catch(err) {
+                this.logger.error('Uncaught error in dismission', err)
+            }
         }
         this.props.popOverlayContent()
     }