Method _onPacket

packages/engine.io-client/lib/socket.ts:594–634

* Handles a packet. * * @private

(packet: Packet)

   * @private
   */
  private _onPacket(packet: Packet) {
    if (
      "opening" === this.readyState ||
      "open" === this.readyState ||
      "closing" === this.readyState
    ) {
      debug('socket receive: type "%s", data "%s"', packet.type, packet.data);

      this.emitReserved("packet", packet);

      // Socket is live - any packet counts
      this.emitReserved("heartbeat");

      switch (packet.type) {
        case "open":
          this.onHandshake(JSON.parse(packet.data));
          break;

        case "ping":
          this._sendPacket("pong");
          this.emitReserved("ping");
          this.emitReserved("pong");
          this._resetPingTimeout();
          break;

        case "error":
          const err = new Error("server error");
          // @ts-ignore
          err.code = packet.data;
          this._onError(err);
          break;

        case "message":
          this.emitReserved("data", packet.data);
          this.emitReserved("message", packet.data);
          break;
      }
    } else {
      debug('packet received with socket readyState "%s"', this.readyState);
    }
  }

  /**
   * Called upon handshake completion.