text: import sys
  import typing as t
  import logging
  
  from .router import Router
  from .wrappers import Request, Response
  from .errors import HttpError, InternalServerError
  
  
  logging.basicConfig(
      format='[%(asctime)s] [%(levelname)s %(module)s] [%(lineno)s] %(message)s',
      level=logging.ERROR,
      stream=sys.stderr
  )
  logger = logging.getLogger(__name__)
  
  
  class YAWF:
      def __init__(self, request_class=Request):
          self.router = Router()
          self._request_class = request_class
  
      def make_request(self, environment) -> Request:
          environment['app'] = self
          return self._request_class(environment)
  
      def find_handler(self, request: Request) -> t.Callable:
          return self.router.search_route(path=request.path, method=request.method)
  
      def before_response(self, request: Request) -> Request:
          return request
  
      def after_response(self, response: Response) -> Response:
          return response
  
      def make_response(self, environment) -> Response:
          logger.debug('Creating request from wsgi environment')
          request = self.make_request(environment)
  
          logger.debug('Preprocessing request with before_response method')
          request = self.before_response(request)
  
          handler, args = self.find_handler(request)
          response = handler(request, **args)
  
          logger.debug('Postprocessing response with after_response method')
          response = self.after_response(response)
  
          return response
  
      def __call__(self, environment, start_response):
          try:
              response = self.make_response(environment)
          except HttpError as error:
              response = error
          except Exception:
              logger.exception('Unknown error', exc_info=True)
              response = InternalServerError()
          finally:
              return response(environment, start_response)
  