@xmcl/client/dist/index.mjs.map

Minecraft socket pipeline utilities. Support Minecraft lan server discovery.

{
  "version": 3,
  "sources": ["../coders.ts", "../packet.ts", "../channel.ts", "../status.ts", "../lan.ts"],
  "sourcesContent": ["import { deserializeSync, serializeSync } from '@xmcl/nbt'\nimport { ByteBuffer } from '@xmcl/bytebuffer'\nimport '@xmcl/bytebuffer/varint32'\nimport '@xmcl/bytebuffer/varint64'\nimport type { PacketRegistry } from './channel'\n\nexport interface SlotData {\n  blockId: number\n  itemCount?: number\n  itemDamage?: number\n  nbt?: any\n}\n\n/**\n * The packet encode/decode algorithm\n */\nexport interface Coder<T> {\n  readonly encode: (buffer: ByteBuffer, data: T, context?: PacketRegistry) => void\n  readonly decode: (buffer: ByteBuffer, context?: PacketRegistry) => T\n}\n\nexport const VarInt: Coder<number> = {\n  decode: (buffer, inst) => buffer.readVarint32(),\n  encode: (buffer, inst) => { buffer.writeVarint32(inst) },\n}\n\nexport const Int: Coder<number> = {\n  decode: (buffer, inst) => buffer.readInt(),\n  encode: (buffer, inst) => { buffer.writeInt(inst) },\n}\n\nexport const Byte: Coder<number> = {\n  decode: (buffer, inst) => buffer.readByte(),\n  encode: (buffer, inst) => { buffer.writeByte(inst) },\n}\n\nexport const UByte: Coder<number> = {\n  decode: (buffer, inst) => buffer.readUint8(),\n  encode: (buffer, inst) => { buffer.writeUint8(inst) },\n}\n\nexport const Bool: Coder<boolean> = {\n  decode: (buffer, inst) => buffer.readByte() === 1,\n  encode: (buffer, inst) => { buffer.writeByte(inst ? 1 : 0) },\n}\n\nexport const Float: Coder<number> = {\n  decode: (buffer, inst) => buffer.readFloat(),\n  encode: (buffer, inst) => { buffer.writeFloat(inst) },\n}\n\nexport const Double: Coder<number> = {\n  decode: (buffer, inst) => buffer.readDouble(),\n  encode: (buffer, inst) => { buffer.writeDouble(inst) },\n}\n\nexport const UUID: Coder<string> = {\n  decode: (buffer, inst) => {\n    const makeDigit = (hex: string, digit: number) => {\n      if (hex.length < digit) {\n        let d = ''\n        for (let i = 0; i < digit - hex.length; i += 1) {\n          d += '0'\n        }\n        return `${d}${hex}`\n      }\n      return hex\n    }\n    const hi = buffer.readUint64()\n    const lo = buffer.readUint64()\n\n    let a = makeDigit(Number(hi >> 32n).toString(16), 8)\n    const b = makeDigit(((hi >> 16n) & 0xFFFFn).toString(16), 4)\n    const c = makeDigit((hi & 0xFFFFn).toString(16), 4)\n    const d = makeDigit(((lo >> 48n) & 0xFFFFn).toString(16), 4)\n    const e = makeDigit((lo & 0xFFFFFFFFFFFFn).toString(16), 12)\n\n    if (a.length === 16) {\n      a = a.substring(8, 16)\n    }\n\n    return `${a}-${b}-${c}-${d}-${e}`\n  },\n  encode: (buffer, inst) => {\n    const components = inst.split('-')\n    if (components.length !== 5) { throw new Error('Invalid UUID') }\n    let hi = BigInt(`0x${components[0]}`)\n    hi = hi << (16n)\n    hi = hi | (BigInt(`0x${components[1]}`))\n    hi = hi << (16n)\n    hi = hi | (BigInt(`0x${components[2]}`))\n\n    let lo = BigInt(`0x${components[3]}`)\n    lo = lo << 48n\n    lo = lo | (BigInt(`0x${components[4]}`))\n\n    buffer.writeUint64(hi)\n    buffer.writeUint64(lo)\n  },\n}\n\nexport const Short: Coder<number> = {\n  decode: (buffer, inst) => buffer.readShort(),\n  encode: (buffer, inst) => { buffer.writeShort(inst) },\n}\n\nexport const UShort: Coder<number> = {\n  decode: (buffer, inst) => buffer.readUint16(),\n  encode: (buffer, inst) => { buffer.writeUint16(inst) },\n}\n\nexport const Long: Coder<bigint> = {\n  decode: (buffer, inst) => buffer.readLong(),\n  encode: (buffer, inst) => { buffer.writeInt64(inst) },\n}\n\nexport const VarLong: Coder<bigint> = {\n  decode: (buffer, inst) => buffer.readVarint64(),\n  encode: (buffer, inst) => { buffer.writeVarint64(inst) },\n}\n\n// eslint-disable-next-line @typescript-eslint/no-redeclare\nexport const String: Coder<string> = {\n  decode: (buffer) => {\n    const length = buffer.readVarint32()\n    return Buffer.from(buffer.readBytes(length).toBuffer()).toString('utf-8')\n  },\n  encode: (buffer, inst) => {\n    const byte = Buffer.from(inst)\n    buffer.writeVarint32(byte.byteLength)\n    buffer.writeBytes(Buffer.from(inst))\n  },\n}\n\nexport const Json: Coder<any> = {\n  decode: (buffer, inst) => {\n    return JSON.parse(String.decode(buffer, inst))\n  },\n  encode: (buffer, inst, ctx) => {\n    String.encode(buffer, JSON.stringify(inst), ctx)\n  },\n}\n\nexport const Slot: Coder<SlotData> = {\n  decode: (buffer, ctx) => {\n    const blockId = Short.decode(buffer, ctx)\n    if (blockId === -1) { return { blockId } }\n    const itemCount = Byte.decode(buffer) || undefined\n    const itemDamage = Short.decode(buffer) || undefined\n    if (Byte.decode(buffer, ctx) === 0) {\n      return {\n        blockId,\n        itemCount,\n        itemDamage,\n      }\n    }\n    return {\n      blockId,\n      itemCount,\n      itemDamage,\n      nbt: deserializeSync(Buffer.from(buffer.buffer)),\n    }\n  },\n  encode: (buffer, inst) => {\n    Short.encode(buffer, inst.blockId)\n    Byte.encode(buffer, inst.itemCount || 0)\n    Byte.encode(buffer, inst.itemDamage || 0)\n    if (inst.nbt) {\n      Byte.encode(buffer, 1)\n      buffer.writeBytes(serializeSync(inst.nbt))\n    } else {\n      Byte.encode(buffer, 0)\n    }\n  },\n}\n\nexport const ByteArray: Coder<Int8Array> = {\n  decode: (buffer, inst) => {\n    const len = buffer.readVarint32()\n    const arr = new Int8Array(len)\n    for (let i = 0; i < len; i += 1) {\n      arr[i] = buffer.readByte()\n    }\n    return arr\n  },\n  encode: (buffer, inst) => {\n    const len = inst.length\n    buffer.writeVarint32(len)\n    for (let i = 0; i < len; i += 1) {\n      buffer.writeByte(inst[i])\n    }\n  },\n}\n", "import type { State } from './channel'\nimport { Coder } from './coders'\n\ninterface FieldRecord { name: string; type: Coder<any> }\n\nexport type Side = 'server' | 'client'\n\nexport interface PacketRegistryEntry {\n  readonly id: number\n  readonly name: string\n  readonly state: State\n  readonly side: Side\n  readonly coder: Coder<any>\n}\n\nexport type FieldType<T> = (type: Coder<T>) => (target: any, key: string) => void\nexport type PacketType = (side: Side, id: number, state: State) => (constructor: (...args: any[]) => any) => void\n\nexport const PacketMetadata = Symbol('PacketMetadata')\nexport const PacketFieldsMetadata = Symbol('PacketFieldsMetadata')\n\n/**\n * Get a packet registry entry for a class\n * @param clazz The class object\n */\nexport function getPacketRegistryEntry(clazz: new (...args: any) => any): PacketRegistryEntry {\n  return clazz.prototype[PacketMetadata]\n}\n\n/**\n * Annotate the field type in your packet. Assign a coder for serialization/deserialization.\n * This will generate a list of `FieldType` in your class prototype.\n *\n * @param type The coder to serialize/deserialize the field.\n * @see \"coders.ts\"\n */\nexport function Field<T>(type: Coder<T>) {\n  return (target: any, key: string) => {\n    const container = target\n    if (!container[PacketFieldsMetadata]) {\n      container[PacketFieldsMetadata] = []\n    }\n    container[PacketFieldsMetadata].push({ name: key, type })\n  }\n}\n/**\n * Decoarte for you packet class.\n * This will generate a `PacketRegistryEntry` in your class prototype.\n *\n * @param side The side of your packet\n * @param id The id of your packet\n * @param state The state of you packet should be\n */\nexport function Packet(side: Side, id: number, state: State, name = '') {\n  return (constructor: new (...args: any[]) => any) => {\n    const container = constructor.prototype\n    const fields: FieldRecord[] = container[PacketFieldsMetadata] || []\n    container[PacketMetadata] = {\n      id,\n      name: name || constructor.name,\n      side,\n      state,\n      coder: {\n        encode(buffer, value) {\n          fields.forEach((cod) => {\n            cod.type.encode(buffer, value[cod.name])\n          })\n        },\n        decode(buffer) {\n          const value = newCall(constructor)\n          fields.forEach((cod) => {\n            try {\n              value[cod.name] = cod.type.decode(buffer)\n            } catch (e) {\n              console.error(new Error(`Exception during reciving packet [${id}]${constructor.name}`))\n              console.error(e)\n            }\n          })\n          return value\n        },\n      },\n    } as PacketRegistryEntry\n  }\n}\n\n// https://stackoverflow.com/questions/1606797/use-of-apply-with-new-operator-is-this-possible\nfunction newCall(Cls: any) {\n  // tslint:disable-next-line: new-parens\n  // eslint-disable-next-line prefer-rest-params\n  return new (Function.prototype.bind.apply(Cls, arguments as any))()\n}\n", "import { ByteBuffer } from '@xmcl/bytebuffer'\nimport { EventEmitter } from 'events'\nimport { NetConnectOpts, Socket } from 'net'\nimport { Transform, TransformCallback, TransformOptions, Writable } from 'stream'\nimport { unzip } from 'zlib'\nimport { Coder } from './coders'\nimport { PacketRegistryEntry, Side, PacketMetadata } from './packet'\n\nexport type State = keyof States\ninterface States {\n  handshake: PacketCoders\n  login: PacketCoders\n  status: PacketCoders\n  play: PacketCoders\n}\n\n/**\n * The channel for send and listen the Minecraft packet.\n */\nexport class Channel extends EventEmitter {\n  state: State = 'handshake'\n\n  private readonly states = {\n    client: {\n      handshake: new PacketCoders(),\n      login: new PacketCoders(),\n      status: new PacketCoders(),\n      play: new PacketCoders(),\n    },\n    server: {\n      handshake: new PacketCoders(),\n      login: new PacketCoders(),\n      status: new PacketCoders(),\n      play: new PacketCoders(),\n    },\n  }\n\n  private connection: Socket = new Socket({ allowHalfOpen: false })\n\n  private outbound: Writable\n  private inbound: Writable\n  private listened = false\n\n  private enableCompression = false\n  private compressionThreshold = -1\n\n  constructor() {\n    super()\n    this.outbound = new MinecraftPacketEncoder(this)\n    this.outbound.pipe(new MinecraftPacketOutbound()).pipe(this.connection)\n\n    this.inbound = new MinecraftPacketInBound()\n    this.inbound\n      .pipe(new PacketDecompress({\n        get enableCompression() {\n          return false\n        },\n        get compressionThreshold() {\n          return -1\n        },\n      }))\n      .pipe(new MinecraftPacketDecoder(this))\n      .pipe(new PacketEmitter(this))\n\n    this.connection.pipe(this.inbound)\n  }\n\n  /**\n   * Is the connection ready to read and write\n   */\n  get ready() {\n    return this.connection.readable && this.connection.writable && this.listened\n  }\n\n  findCoderById(packetId: number, side: Side): Coder<any> {\n    const all = this.states[side][this.state]\n    return all.packetIdCoders[packetId]\n  }\n\n  getPacketId(packetInst: any, side: Side): number {\n    const packetName = Object.getPrototypeOf(packetInst).constructor.name\n    const all = this.states[side][this.state]\n    return all.packetNameToId[packetName]\n  }\n\n  registerPacketType(clazz: new (...args: any) => any) {\n    const entry: PacketRegistryEntry = clazz.prototype[PacketMetadata]\n    const { state, side, id, name, coder } = entry\n    const coders = this.states[side][state]\n    coders.packetIdCoders[id] = coder\n    coders.packetNameToId[name] = id\n  }\n\n  registerPacket(entry: PacketRegistryEntry) {\n    const { state, side, id, name, coder } = entry\n    const coders = this.states[side][state]\n    coders.packetIdCoders[id] = coder\n    coders.packetNameToId[name] = id\n  }\n\n  /**\n     * Open the connection and start to listen the port.\n     */\n  async listen(option: NetConnectOpts & { keepalive?: boolean | number }) {\n    await new Promise<void>((resolve, reject) => {\n      this.connection.connect(option, () => {\n        resolve()\n      })\n      if (option.timeout) {\n        this.connection.setTimeout(option.timeout)\n      }\n      if (option.keepalive) {\n        this.connection.setKeepAlive(true, typeof option.keepalive === 'boolean' ? 3500 : option.keepalive)\n      }\n      this.connection.once('error', (e) => { reject(e) })\n      this.connection.once('timeout', () => { reject(new Error('Connection timeout.')) })\n    })\n    this.connection.on('error', (e) => { this.emit('error', e) })\n\n    this.emit('listen')\n    this.listened = true\n  }\n\n  disconnect() {\n    if (!this.listened || !this.ready) {\n      return Promise.resolve()\n    }\n    this.listened = false\n    return new Promise<void>((resolve, reject) => {\n      this.connection.once('close', (err) => {\n        if (err) {\n          reject(err)\n        } else {\n          resolve()\n        }\n      })\n      this.connection.end()\n    })\n  }\n\n  /**\n     * Sent a packet to server.\n     */\n  send<T>(message: T, skeleton?: Partial<T>) {\n    if (!this.connection.writable) { throw new Error(\"Cannot write if the connection isn't writable!\") }\n    if (skeleton) { Object.assign((message as any), skeleton) }\n    return new Promise<void>((resolve, reject) => {\n      this.outbound.write(message, (err) => {\n        if (err) {\n          reject(err)\n        } else {\n          this.emit('send', message)\n          resolve()\n        }\n      })\n    })\n  }\n\n  /**\n     * Listen for sepcific packet by its class name.\n     */\n  onPacket<T>(packet: new (...args: any[]) => T, listener: (event: T) => void): this {\n    return this.on(`packet:${packet.name}`, listener)\n  }\n\n  oncePacket<T>(packet: new (...args: any[]) => T, listener: (event: T) => void): this {\n    return this.once(`packet:${packet.name}`, listener)\n  }\n}\n\nexport interface Channel extends EventEmitter {\n  on<T>(channel: string, listener: (event: T) => void): this\n  once<T>(channel: string, listener: (event: T) => void): this\n}\n\nexport abstract class PacketInBound extends Transform {\n  private buffer: ByteBuffer = ByteBuffer.allocate(1024)\n\n  protected abstract readPacketLength(bb: ByteBuffer): number\n\n  _transform(chunk: Buffer, encoding: string, callback: TransformCallback) {\n    this.buffer.ensureCapacity(chunk.length + this.buffer.offset)\n    this.buffer.append(chunk)\n    this.buffer.flip()\n\n    let unresolvedBytes\n    do {\n      const packetLength = this.readPacketLength(this.buffer)\n      unresolvedBytes = this.buffer.remaining()\n\n      if (packetLength <= unresolvedBytes) {\n        const result = Buffer.alloc(packetLength)\n        // TODO: check if this src refactor is correct\n        const src = Buffer.from(this.buffer.buffer)\n        src.copy(result, 0, this.buffer.offset, this.buffer.offset + packetLength)\n        this.push(result)\n\n        src.copyWithin(0, packetLength) // clear emitted bytes\n        this.buffer.offset = 0 // reset read offset to the front\n        this.buffer.limit -= packetLength // reduce the limit by emitted bytes\n\n        unresolvedBytes -= packetLength\n      } else {\n        this.buffer.offset = this.buffer.limit\n        this.buffer.limit = this.buffer.capacity()\n        break\n      }\n    } while (unresolvedBytes > 0)\n    callback()\n  }\n}\n\nclass MinecraftPacketInBound extends PacketInBound {\n  protected readPacketLength(bb: ByteBuffer): number {\n    return bb.readVarint32()\n  }\n}\n\nclass PacketDecompress extends Transform {\n  constructor(private option: { readonly enableCompression: boolean; readonly compressionThreshold: number }) {\n    super()\n  }\n\n  _transform(chunk: Buffer, encoding: string, callback: TransformCallback) {\n    if (!this.option.enableCompression) {\n      this.push(chunk)\n      callback()\n      return\n    }\n    const message = ByteBuffer.wrap(chunk)\n    const dataLength = message.readVarint32()\n    if (dataLength === 0 || dataLength < this.option.compressionThreshold) {\n      this.push(message.buffer.slice(message.offset))\n      callback()\n    } else {\n      const compressedContent = message.buffer.slice(message.offset)\n      unzip(compressedContent, (err, result) => {\n        if (err) {\n          callback(err)\n        } else {\n          this.push(result)\n          callback()\n        }\n      })\n    }\n  }\n}\n\nexport interface PacketRegistry {\n  findCoderById(packetId: number, side: 'client' | 'server'): Coder<any>\n  getPacketId(message: any, side: 'client' | 'server'): number\n}\n\nexport abstract class PacketDecoder extends Transform {\n  constructor(private client: PacketRegistry) {\n    super({ writableObjectMode: true, readableObjectMode: true })\n  }\n\n  abstract readPacketId(message: ByteBuffer): number\n\n  _transform(chunk: Buffer, encoding: string, callback: TransformCallback) {\n    const message = ByteBuffer.wrap(chunk)\n    const packetId = this.readPacketId(message)\n    const packetContent = message.slice()\n    const coder = this.client.findCoderById(packetId, 'server')\n    if (coder) {\n      this.push(coder.decode(packetContent))\n    } else {\n      console.error(`Unknown packet ${packetId} : ${packetContent.buffer}.`)\n    }\n    callback()\n  }\n}\n\nclass MinecraftPacketDecoder extends PacketDecoder {\n  readPacketId(message: ByteBuffer): number {\n    return message.readVarint32()\n  }\n}\n\nexport class PacketEmitter extends Writable {\n  constructor(private eventBus: EventEmitter) {\n    super({ objectMode: true })\n  }\n\n  _write(inst: any, encoding: string, callback: (error?: Error | null) => void): void {\n    this.eventBus.emit(`packet:${Object.getPrototypeOf(inst).constructor.name}`, inst)\n    callback()\n  }\n}\n\nexport abstract class PacketEncoder extends Transform {\n  constructor(private client: PacketRegistry) {\n    super({ writableObjectMode: true, readableObjectMode: true })\n  }\n\n  protected abstract writePacketId(bb: ByteBuffer, id: number): void\n\n  _transform(message: any, encoding: string, callback: TransformCallback) {\n    const id = this.client.getPacketId(message, 'client')\n    const coder = this.client.findCoderById(id, 'client')\n    if (coder && coder.encode) {\n      const buf = new ByteBuffer()\n      this.writePacketId(buf, id)\n      coder.encode(buf, message, this.client)\n      buf.flip()\n      const arr = buf.buffer.slice(0, buf.limit)\n      this.push(Buffer.from(arr))\n      callback()\n    } else {\n      callback(new Error(`Cannot find coder for message. ${JSON.stringify(message)}`))\n    }\n  }\n}\n\nclass MinecraftPacketEncoder extends PacketEncoder {\n  protected writePacketId(bb: ByteBuffer, id: number): void {\n    bb.writeByte(id)\n  }\n}\n\nexport abstract class PacketOutbound extends Transform {\n  protected abstract writePacketLength(bb: ByteBuffer, len: number): void\n\n  constructor(private channelWidth = Number.MAX_SAFE_INTEGER, opts?: TransformOptions) {\n    super(opts)\n  }\n\n  _transform(packet: Buffer, encoding: string, callback: TransformCallback) {\n    const buffer = new ByteBuffer()\n\n    this.writePacketLength(buffer, packet.length)\n    buffer.append(packet)\n    buffer.flip()\n\n    let bytesToSend = buffer.remaining()\n    while (bytesToSend > 0) {\n      const toSend = Math.min(bytesToSend, this.channelWidth)\n      const chunk = buffer.readBytes(toSend)\n      this.push(Buffer.from(chunk.toBuffer()))\n      bytesToSend -= toSend\n    }\n\n    callback()\n  }\n}\n\nclass MinecraftPacketOutbound extends PacketOutbound {\n  protected writePacketLength(bb: ByteBuffer, len: number): void {\n    bb.writeVarint32(len)\n  }\n}\n\nclass PacketCoders {\n  packetIdCoders: { [packetId: number]: Coder<any> } = {}\n  packetNameToId: { [name: string]: number } = {}\n}\n", "/* eslint-disable @typescript-eslint/no-redeclare */\nimport { TextComponent } from '@xmcl/text-component'\nimport { Channel } from './channel'\nimport { VarInt, String, Long as CLong, Short, Json } from './coders'\nimport { Packet, Field } from './packet'\n\n@Packet('client', 0x00, 'handshake')\nexport class Handshake {\n  @Field(VarInt) protocolVersion!: number\n\n  @Field(String) serverAddress!: string\n\n  @Field(Short) serverPort!: number\n\n  @Field(VarInt) nextState!: number\n}\n\n@Packet('client', 0x00, 'status')\nexport class ServerQuery { }\n\n@Packet('server', 0x00, 'status')\nexport class ServerStatus { @Field(Json) status!: Status }\n\n@Packet('client', 0x01, 'status')\nexport class Ping { @Field(CLong) time = BigInt(Date.now()) }\n\n@Packet('server', 0x01, 'status')\nexport class Pong { @Field(CLong) ping!: bigint }\n\n/**\n * The json format for Minecraft server handshake status query response\n */\nexport interface Status {\n  /**\n     * The version info of the server\n     */\n  version: {\n    /**\n     * The name of the version, might be standard version, like 1.14.4.\n     * Or it can be modified content, just be any string the server hoster like.\n     */\n    name: string\n    /**\n     * The protocol version\n     */\n    protocol: number\n  }\n  /**\n     * The player info in server\n     */\n  players: {\n    /**\n         * The server max player capacity\n         */\n    max: number\n    /**\n         * The current online player number\n         */\n    online: number\n    /**\n         * The online player info\n         */\n    sample?: Array<GameProfile>\n  }\n  /**\n     * The motd of server, which might be the raw TextComponent string or structurelized TextComponent JSON\n     */\n  description: TextComponent | string\n  /**\n     * The base 64 favicon data\n     */\n  favicon: string | ''\n  modinfo?: {\n    type: string | 'FML'\n    modList: Array<ForgeModIdentity>\n  }\n  /**\n     * The ping from server\n     */\n  ping: number\n}\ninterface GameProfile {\n  name: string\n  id: string\n}\ninterface ForgeModIdentity {\n  readonly modid: string\n  readonly version: string\n}\n\nexport interface QueryOptions {\n  /**\n     * see http://wiki.vg/Protocol_version_numbers\n     */\n  protocol?: number\n  /**\n     * timeout milliseconds\n     */\n  timeout?: number\n  retryTimes?: number\n}\n\n/**\n * Create a channel with Handleshake, ServerQuery, ServerStatus, Ping, Pong packets are registered.\n *\n * This is a lower level function for the case that you want to use channel directly\n *\n * @see {@link Channel}\n */\nexport function createChannel() {\n  const channel: Channel = new Channel()\n  channel.registerPacketType(Handshake)\n  channel.registerPacketType(ServerQuery)\n  channel.registerPacketType(ServerStatus)\n  channel.registerPacketType(Ping)\n  channel.registerPacketType(Pong)\n  return channel\n}\n\n/**\n * Query the server status in raw JSON format in one shot.\n *\n * @param server The server information\n * @param options The query options\n */\nexport async function queryStatus(server: { host: string; port?: number }, options: QueryOptions = {}): Promise<Status> {\n  const host = server.host\n  const port = server.port || 25565\n  const timeout = options.timeout || 4000\n  const protocol = options.protocol || 498\n  const retry = typeof options.retryTimes === 'number' ? options.retryTimes : 0\n\n  let result: Status | undefined\n  let error: Error | undefined\n\n  const channel: Channel = createChannel()\n\n  for (let retryTimes = retry + 1; retryTimes > 0; retryTimes--) {\n    try {\n      result = await query(channel, host, port, timeout, protocol)\n      break\n    } catch (e) {\n      error = e as Error\n    }\n  }\n  if (result) {\n    return result\n  }\n  throw error\n}\n\n/**\n * Create a query client for certain protocol and timeout setting.\n * @param protocol The protocol number\n * @param timeout The timeout millisecond\n */\nexport function createClient(protocol: number, timeout?: number) {\n  const channel: Channel = createChannel()\n  return {\n    get channel() { return channel },\n    set protocol(v: number) { protocol = v },\n    get protocol() { return protocol },\n    query(host: string, port = 25565) {\n      return query(channel, host, port, timeout || 4000, protocol)\n    },\n  }\n}\n\nasync function query(channel: Channel, host: string, port: number, timeout: number, protocol: number) {\n  await channel.listen({\n    host,\n    port,\n    timeout,\n  })\n  const { status } = await new Promise<ServerStatus>((resolve, reject) => {\n    channel.oncePacket(ServerStatus, (e) => {\n      resolve(e)\n    })\n    channel.once('error', reject)\n    try {\n      channel.send(new Handshake(), {\n        protocolVersion: protocol,\n        serverAddress: host,\n        serverPort: port,\n        nextState: 1,\n      })\n      channel.state = 'status'\n      channel.send(new ServerQuery())\n      setTimeout(() => {\n        reject(new Error('Timeout'))\n      }, timeout * 10)\n    } catch (e) {\n      reject(e)\n    }\n  })\n\n  const { ping } = await new Promise<Pong>((resolve, reject) => {\n    channel.once<Pong>('packet:Pong', (e) => {\n      resolve(e)\n    })\n    channel.once('error', reject)\n    try {\n      channel.send(new Ping())\n    } catch (e) {\n      reject(e)\n    }\n  })\n  status.ping = Number(BigInt(Date.now()) - ping)\n\n  await channel.disconnect()\n\n  return status\n}\n", "import { Socket, createSocket, RemoteInfo } from 'dgram'\nimport { EventEmitter } from 'events'\n\nexport const LAN_MULTICAST_ADDR = '224.0.2.60'\nexport const LAN_MULTICAST_ADDR_V6 = 'FF75:230::60'\nexport const LAN_MULTICAST_PORT = 4445\n\nexport interface MinecraftLanDiscover {\n  on(channel: 'discover', listener: (event: LanServerInfo & { remote: RemoteInfo }) => void): this\n  once(channel: 'discover', listener: (event: LanServerInfo & { remote: RemoteInfo }) => void): this\n  addListener(channel: 'discover', listener: (event: LanServerInfo & { remote: RemoteInfo }) => void): this\n  removeListener(channel: 'discover', listener: (event: LanServerInfo & { remote: RemoteInfo }) => void): this\n}\n\nexport class MinecraftLanDiscover extends EventEmitter {\n  readonly socket: Socket\n\n  #ready = false\n  #group: string\n\n  get isReady() {\n    return this.#ready\n  }\n\n  constructor(type: 'udp4' | 'udp6' = 'udp4') {\n    super()\n    const sock = createSocket({ type, reuseAddr: true })\n\n    this.#group = type === 'udp4' ? LAN_MULTICAST_ADDR : LAN_MULTICAST_ADDR_V6\n\n    sock.on('listening', () => {\n      const address = sock.address()\n      sock.addMembership(this.#group, type === 'udp4' ? address.address : undefined)\n      sock.setMulticastTTL(128)\n      sock.setBroadcast(true)\n      this.#ready = true\n    })\n\n    sock.on('message', (buf, remote) => {\n      const content = buf.toString('utf-8')\n\n      const motdRegx = /\\[MOTD\\](.+)\\[\\/MOTD\\]/g\n      const portRegx = /\\[AD\\](.+)\\[\\/AD\\]/g\n\n      const portResult = portRegx.exec(content)\n      if (!portResult || !portResult[1]) {\n        // emit error\n      } else {\n        const motd = motdRegx.exec(content)?.[1] ?? ''\n        const port = Number.parseInt(portResult[1])\n        this.emit('discover', { motd, port, remote })\n      }\n    })\n\n    this.socket = sock\n  }\n\n  broadcast(inf: LanServerInfo) {\n    return new Promise<number>((resolve, reject) => {\n      this.socket.send(`[MOTD]${inf.motd}[/MOTD][AD]${inf.port}[/AD]`, LAN_MULTICAST_PORT, this.#group, (err, bytes) => {\n        if (err) reject(err)\n        else resolve(bytes)\n      })\n    })\n  }\n\n  bind(): Promise<void> {\n    return new Promise((resolve, reject) => {\n      this.socket.bind(LAN_MULTICAST_PORT, () => {\n        resolve()\n      }).once('error', (e) => {\n        reject(e)\n      })\n    })\n  }\n\n  destroy(): Promise<void> {\n    return new Promise((resolve) => {\n      this.socket.close(resolve)\n    })\n  }\n}\n\nexport interface LanServerInfo {\n  motd: string\n  port: number\n}\n"],
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}