@slippi/slippi-js/dist/console/communication.esm.js

Official Project Slippi Javascript SDK

import { decode, encode } from '@shelacek/ubjson';

var CommunicationType;
(function (CommunicationType) {
  CommunicationType[CommunicationType["HANDSHAKE"] = 1] = "HANDSHAKE";
  CommunicationType[CommunicationType["REPLAY"] = 2] = "REPLAY";
  CommunicationType[CommunicationType["KEEP_ALIVE"] = 3] = "KEEP_ALIVE";
})(CommunicationType || (CommunicationType = {}));
// This class is responsible for handling the communication protocol between the Wii and the
// desktop app
class ConsoleCommunication {
  constructor() {
    this.receiveBuf = Buffer.from([]);
    this.messages = new Array();
  }
  receive(data) {
    this.receiveBuf = Buffer.concat([this.receiveBuf, data]);
    while (this.receiveBuf.length >= 4) {
      // First get the size of the message we are expecting
      const msgSize = this.receiveBuf.readUInt32BE(0);
      if (this.receiveBuf.length < msgSize + 4) {
        // If we haven't received all the data yet, let's wait for more
        return;
      }
      // Here we have received all the data, so let's decode it
      const ubjsonData = this.receiveBuf.slice(4, msgSize + 4);
      this.messages.push(decode(ubjsonData.buffer));
      // Remove the processed data from receiveBuf
      this.receiveBuf = this.receiveBuf.slice(msgSize + 4);
    }
  }
  getReceiveBuffer() {
    return this.receiveBuf;
  }
  getMessages() {
    const toReturn = this.messages;
    this.messages = [];
    return toReturn;
  }
  genHandshakeOut(cursor, clientToken, isRealtime = false) {
    const clientTokenBuf = Buffer.from([0, 0, 0, 0]);
    clientTokenBuf.writeUInt32BE(clientToken, 0);
    const message = {
      type: CommunicationType.HANDSHAKE,
      payload: {
        cursor: cursor,
        clientToken: Uint8Array.from(clientTokenBuf),
        // TODO: Use real instance token
        isRealtime: isRealtime
      }
    };
    const buf = encode(message, {
      optimizeArrays: true
    });
    const msg = Buffer.concat([Buffer.from([0, 0, 0, 0]), Buffer.from(buf)]);
    msg.writeUInt32BE(buf.byteLength, 0);
    return msg;
  }
}

export { CommunicationType, ConsoleCommunication };
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