code: def run_forever(self):
          
          server_coroutine = self.loop.create_server(
              self._protocol,
              self.addr[0],
              self.addr[1],
              ssl=self.ssl,
              backlog=self.backlog
          )
          try:
              self.rpc_server = self.loop.run_until_complete(server_coroutine)
          except BaseException:
              logger.exception("Unable to start server")
              return
          _singals = (SIGINT, SIGTERM)
          for _signal in _singals:
              try:
                  self.loop.add_signal_handler(_signal, self.loop.stop)
              except NotImplementedError as ni:
                  logger.warning('tried to use loop.add_signal_handler '
                                 'but it is not implemented on this platform.')
          self.pid = os.getpid()
          logger.info(
              "Server @{host}:{port}".format(
                  host=self.addr[0],
                  port=self.addr[1]
              )
          )
          logger.info(
              """Starting worker [{pid}]
    _ __ ___  _ __  _ __ _ __   ___ 
   | '_ ` _ \| '_ \| '__| '_ \ / __|
   | | | | | | |_) | |  | |_) | (__ 
   |_| |_| |_| .__/|_|  | .__/ \___|
             |_|        |_|                 
  """.format(pid=self.pid))
          self.running = True
          self.loop.run_forever()
docs: 执行服务器.