wsgi_server.py 文件源码

def _start_all_fixed_port(self, host_ports):
    """Starts a server for each specified address with a fixed port.

    Does the work of actually trying to create a _SingleAddressWsgiServer for
    each specified address.

    Args:
      host_ports: An iterable of host, port tuples.

    Raises:
      BindError: The address could not be bound.
    """
    for host, port in host_ports:
      assert port != 0
      server = _SingleAddressWsgiServer((host, port), self._app)
      try:
        server.start()
      except BindError as bind_error:
        # TODO: I'm not sure about the behavior of quietly ignoring an
        # EADDRINUSE as long as the bind succeeds on at least one interface. I
        # think we should either:
        # - Fail (just like we do now when bind fails on every interface).
        # - Retry on next highest port.
        logging.debug('Failed to bind "%s:%s": %s', host, port, bind_error)
        continue
      else:
        self._servers.append(server)

    if not self._servers:
      raise BindError('Unable to bind %s:%s' % self.bind_addr)