wsgi_server.py 文件源码

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

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

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

    Returns:
      The list of all servers (also saved as self._servers). A non empty list
      indicates success while an empty list indicates failure.
    """
    port = 0
    for host, _ in host_ports:
      server = _SingleAddressWsgiServer((host, port), self._app)
      try:
        server.start()
        if port == 0:
          port = server.port
      except BindError as bind_error:
        if bind_error[1][0] == errno.EADDRINUSE:
          # The port picked at random for first interface was not available
          # on one of the other interfaces. Forget them and try again.
          for server in self._servers:
            server.quit()
          self._servers = []
          break
        else:
          # Ignore the interface if we get an error other than EADDRINUSE.
          logging.debug('Failed to bind "%s:%s": %s', host, port, bind_error)
          continue
      else:
        self._servers.append(server)
    return self._servers