Method send

lib/sender.js:351–414

* Sends a data message to the other peer. * * @param {*} data The message to send * @param {Object} options Options object * @param {Boolean} [options.binary=false] Specifies whether `data` is binary * or text * @param {Boolean} [options.compress=false] Specifies whether or not

(data, options, cb)

   * @public
   */
  send(data, options, cb) {
    const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName];
    let opcode = options.binary ? 2 : 1;
    let rsv1 = options.compress;

    let byteLength;
    let readOnly;

    if (typeof data === 'string') {
      byteLength = Buffer.byteLength(data);
      readOnly = false;
    } else if (isBlob(data)) {
      byteLength = data.size;
      readOnly = false;
    } else {
      data = toBuffer(data);
      byteLength = data.length;
      readOnly = toBuffer.readOnly;
    }

    if (this._firstFragment) {
      this._firstFragment = false;
      if (
        rsv1 &&
        perMessageDeflate &&
        perMessageDeflate.params[
          perMessageDeflate._isServer
            ? 'server_no_context_takeover'
            : 'client_no_context_takeover'
        ]
      ) {
        rsv1 = byteLength >= perMessageDeflate._threshold;
      }
      this._compress = rsv1;
    } else {
      rsv1 = false;
      opcode = 0;
    }

    if (options.fin) this._firstFragment = true;

    const opts = {
      [kByteLength]: byteLength,
      fin: options.fin,
      generateMask: this._generateMask,
      mask: options.mask,
      maskBuffer: this._maskBuffer,
      opcode,
      readOnly,
      rsv1
    };

    if (isBlob(data)) {
      if (this._state !== DEFAULT) {
        this.enqueue([this.getBlobData, data, this._compress, opts, cb]);
      } else {
        this.getBlobData(data, this._compress, opts, cb);
      }