Function _applyMiddlewares

packages/engine.io/lib/server.ts:372–398

* Apply the middlewares to the request. * * @param req * @param res * @param callback * @protected

(
    req: IncomingMessage,
    res: ServerResponse,
    callback: (err?: any) => void,
  )

   * @protected
   */
  protected _applyMiddlewares(
    req: IncomingMessage,
    res: ServerResponse,
    callback: (err?: any) => void,
  ) {
    if (this.middlewares.length === 0) {
      debug("no middleware to apply, skipping");
      return callback();
    }

    const apply = (i) => {
      debug("applying middleware n°%d", i + 1);
      this.middlewares[i](req, res, (err?: any) => {
        if (err) {
          return callback(err);
        }

        if (i + 1 < this.middlewares.length) {
          apply(i + 1);
        } else {
          callback();
        }
      });
    };

    apply(0);
  }

  /**
   * Closes all clients.