@hazae41/kcp/dist/esm/mods/kcp/reader.mjs.map

Zero-copy KCP protocol for the web

{"version":3,"file":"reader.mjs","sources":["../../../../src/mods/kcp/reader.ts"],"sourcesContent":["import { Empty, Opaque, Readable } from \"@hazae41/binary\";\nimport { Cursor } from \"@hazae41/cursor\";\nimport { Console } from \"mods/console/index.js\";\nimport { KcpSegment } from \"./segment.js\";\nimport { SecretKcpDuplex } from \"./stream.js\";\n\nexport type KcpReadError =\n  | ExpectedKcpSegmentError\n  | UnknownKcpCommandError\n\nexport class ExpectedKcpSegmentError extends Error {\n  readonly #class = ExpectedKcpSegmentError\n  readonly name = this.#class.name\n\n  constructor() {\n    super(`Expected a KCP segment`)\n  }\n\n}\n\nexport class UnknownKcpCommandError extends Error {\n  readonly #class = UnknownKcpCommandError\n  readonly name = this.#class.name\n\n  constructor() {\n    super(`Unknown KCP command`)\n  }\n\n}\n\nexport type SecretKcpReaderEvents = {\n  ack: (segment: KcpSegment<Opaque>) => void\n}\n\nexport class SecretKcpReader {\n\n  readonly #buffer = new Map<number, KcpSegment<Opaque>>()\n\n  constructor(\n    readonly parent: SecretKcpDuplex\n  ) { }\n\n  async onWrite(chunk: Opaque) {\n    const cursor = new Cursor(chunk.bytes)\n\n    while (cursor.remaining)\n      await this.#onSegment(Readable.readOrRollbackAndThrow(KcpSegment, cursor))\n\n    return\n  }\n\n  async #onSegment(segment: KcpSegment<Opaque>) {\n    if (segment.conversation !== this.parent.conversation)\n      return\n\n    if (segment.command === KcpSegment.commands.push)\n      return await this.#onPushSegment(segment)\n    if (segment.command === KcpSegment.commands.ack)\n      return await this.#onAckSegment(segment)\n    if (segment.command === KcpSegment.commands.wask)\n      return await this.#onWaskSegment(segment)\n\n    throw new UnknownKcpCommandError()\n  }\n\n  async #onPushSegment(segment: KcpSegment<Opaque>) {\n    const conversation = this.parent.conversation\n    const command = KcpSegment.commands.ack\n    const timestamp = segment.timestamp\n    const serial = segment.serial\n    const unackSerial = this.parent.recvCounter\n    const fragment = new Empty()\n\n    const ack = KcpSegment.empty({ conversation, command, timestamp, serial, unackSerial, fragment })\n\n    this.parent.output.enqueue(ack)\n\n    if (segment.serial < this.parent.recvCounter) {\n      Console.debug(`Received previous KCP segment`)\n      return\n    }\n\n    if (segment.serial > this.parent.recvCounter) {\n      Console.debug(`Received next KCP segment`)\n      this.#buffer.set(segment.serial, segment)\n      return\n    }\n\n    this.parent.input.enqueue(segment.fragment)\n\n    this.parent.recvCounter++\n\n    let next: KcpSegment<Opaque> | undefined\n\n    while (next = this.#buffer.get(this.parent.recvCounter)) {\n      Console.debug(`Unblocked next KCP segment`)\n\n      this.parent.input.enqueue(next.fragment)\n      this.#buffer.delete(this.parent.recvCounter)\n\n      this.parent.recvCounter++\n    }\n  }\n\n  async #onAckSegment(segment: KcpSegment<Opaque>) {\n    const future = this.parent.resolveOnAckBySerial.get(segment.serial)\n\n    if (future == null)\n      return\n    this.parent.resolveOnAckBySerial.delete(segment.serial)\n\n    future.resolve()\n  }\n\n  async #onWaskSegment(segment: KcpSegment<Opaque>) {\n    const conversation = this.parent.conversation\n    const command = KcpSegment.commands.wins\n    const serial = 0\n    const unackSerial = this.parent.recvCounter\n    const fragment = new Empty()\n\n    const wins = KcpSegment.empty({ conversation, command, serial, unackSerial, fragment })\n\n    this.parent.output.enqueue(wins)\n  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