skywalking/agent/protocol/grpc.py [195:216]:
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    def report_meter(self, queue: Queue, block: bool = True):
        start = None

        def generator():
            nonlocal start

            while True:
                try:
                    timeout = config.agent_queue_timeout  # type: int
                    if not start:  # make sure first time through queue is always checked
                        start = time()
                    else:
                        timeout -= int(time() - start)
                        if timeout <= 0:  # this is to make sure we exit eventually instead of being fed continuously
                            return
                    meter_data = queue.get(block=block, timeout=timeout)  # type: MeterData
                except Empty:
                    return

                queue.task_done()

                yield meter_data
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skywalking/agent/protocol/kafka.py [140:160]:
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    def report_meter(self, queue: Queue, block: bool = True):
        start = None

        def generator():
            nonlocal start

            while True:
                try:
                    timeout = config.agent_queue_timeout  # type: int
                    if not start:  # make sure first time through queue is always checked
                        start = time()
                    else:
                        timeout -= int(time() - start)
                        if timeout <= 0:  # this is to make sure we exit eventually instead of being fed continuously
                            return
                    meter_data = queue.get(block=block, timeout=timeout)  # type: MeterData
                except Empty:
                    return
                queue.task_done()

                yield meter_data
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