def start()

in skywalking/agent/__init__.py [0:0]

• 20 lines of code
• 12 McCabe index (conditional complexity)

    def start(self) -> None:
        loggings.init()

        if sys.version_info < (3, 7):
            # agent may or may not work for Python 3.6 and below
            # since 3.6 is EOL, we will not officially support it
            logger.warning('SkyWalking Python agent does not support Python 3.6 and below, '
                           'please upgrade to Python 3.7 or above.')

        if not self.__started:
            # if not already started, start the agent
            config.finalize()  # Must be finalized exactly once

            self.__started = True
            logger.info(f'SkyWalking async agent instance {config.agent_instance_name} starting in pid-{os.getpid()}.')

            # Here we install all other lib plugins on first time start (parent process)
            plugins.install()

        elif self.__started and os.getpid() == self.started_pid:
            # if already started, and this is the same process, raise an error
            raise RuntimeError('SkyWalking Python agent has already been started in this process, '
                               'did you call start more than once in your code + sw-python CLI? '
                               'If you already use sw-python CLI, you should remove the manual start(), vice versa.')

        self.started_pid = os.getpid()
        atexit.register(self.__fini)

        # still init profile here, since it is using threading rather than asyncio
        if config.agent_profile_active:
            profile.init()

        self.event_loop_thread = Thread(name='event_loop_thread', target=self.__start_event_loop, daemon=True)
        self.event_loop_thread.start()