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- Update apps, consumers, and serializers - Add scheduler and tasks modules Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
33 lines
1.1 KiB
Python
33 lines
1.1 KiB
Python
import time
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import logging
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from django.core.cache import cache
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logger = logging.getLogger(__name__)
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# 超时阈值：3分钟（设备每2分钟上报一次，留1分钟容差）
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DEVICE_OFFLINE_TIMEOUT = 180
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def check_device_online_status():
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"""
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检查所有状态为 connected 的设备，如果超过3分钟没有上报数据，标记为离线。
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由定时任务每60秒调用一次。
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"""
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from device_interaction.models import Device
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connected_devices = Device.objects.filter(status='connected')
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now = time.time()
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offline_count = 0
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for device in connected_devices:
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last_seen = cache.get(f"device:last_seen:{device.mac_address}")
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if last_seen is None or (now - float(last_seen)) > DEVICE_OFFLINE_TIMEOUT:
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device.status = 'disconnected'
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device.save(update_fields=['status'])
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cache.delete(f"device:last_seen:{device.mac_address}")
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offline_count += 1
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logger.info(f"Device {device.mac_address} marked offline (timeout)")
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if offline_count > 0:
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logger.info(f"check_device_online_status: {offline_count} device(s) marked offline")
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