def start_profiling()

in skywalking/profile/profile_context.py [0:0]

• 27 lines of code
• 8 McCabe index (conditional complexity)

    def start_profiling(self, context: ProfileTaskExecutionContext):
        logger.debug('GreenletProfiler::start_profiling')
        self._task_execution_context = context
        try:
            curr = self._profiling_thread

            def callback(event, args):
                origin, target = args
                if origin == curr or target == curr:
                    try:
                        snapshot = self.build_snapshot()
                        if snapshot is not None:
                            agent.add_profiling_snapshot(snapshot)
                        else:
                            # tell execution context current tracing thread dump failed, stop it
                            # todo test it
                            self._profile_context.stop_tracing_profile(self.trace_context)
                    except BlockingSwitchOutError:
                        self._profile_context.stop_tracing_profile(self.trace_context)
                    except Exception as e:
                        logger.error(f'build and add snapshot failed. error: {e}')
                        self._profile_context.stop_tracing_profile(self.trace_context)
                        raise e


            self.profile_status.update_status(ProfileStatus.PROFILING)
            self._old_trace = curr.settrace(callback)

        except Exception as e:
            logger.error('profiling task fail. task_id:[%s] error:[%s]', self._profile_context.task.task_id, e)
            # todo test this can current stop profile task or not
            self._task_execution_service.stop_current_profile_task(
                self._task_execution_context
            )