def build_snapshot()

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

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

    def build_snapshot(self) -> Optional[TracingThreadSnapshot]:
        if not self._profiling_thread.is_alive():
            return None

        current_time = current_milli_time()

        stack_list = []

        # get thread stack of target thread
        stack = sys._current_frames().get(int(self._profiling_thread.ident))
        if not stack:
            return None

        extracted = traceback.extract_stack(stack)
        for idx, item in enumerate(extracted):
            if idx > config.agent_profile_dump_max_stack_depth:
                break

            code_sig = f'{item.filename}.{item.name}: {item.lineno}'
            stack_list.append(code_sig)

        # if is first dump, check is can start profiling
        if self.dump_sequence == 0 and not self._profile_context.is_start_profileable():
            return None

        t = TracingThreadSnapshot(self._profile_context.task.task_id,
                                  self._segment_id,
                                  self.dump_sequence,
                                  current_time,
                                  stack_list)
        self.dump_sequence += 1
        return t