47 lines
1.7 KiB
Python
47 lines
1.7 KiB
Python
from typing import Dict, Optional, List
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from platypush.backend.sensor import SensorBackend
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from platypush.message.event.linode import LinodeInstanceStatusChanged
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class LinodeBackend(SensorBackend):
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"""
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This backend monitors the state of one or more Linode instances.
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Triggers:
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* :class:`platypush.message.event.linode.LinodeInstanceStatusChanged` when the status of an instance changes.
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Requires:
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* The :class:`platypush.plugins.linode.LinodePlugin` plugin configured.
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"""
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def __init__(self, instances: Optional[List[str]] = None, poll_seconds: float = 30.0, **kwargs):
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"""
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:param instances: List of instances to monitor, by label (default: monitor all the instances).
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"""
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super().__init__(plugin='linode', poll_seconds=poll_seconds, **kwargs)
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self.instances = set(instances or [])
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def process_data(self, data: Dict[str, dict], new_data: Optional[Dict[str, dict]] = None, **kwargs):
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instances = data.get('instances', {})
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old_instances = (self.data or {}).get('instances', {})
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if self.instances:
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instances = {label: instances[label] for label in self.instances if label in instances}
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if not instances:
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return
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for label, instance in instances.items():
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old_instance = old_instances.get(label, {})
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if 'status' in old_instance and old_instance['status'] != instance['status']:
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self.bus.post(LinodeInstanceStatusChanged(instance=label,
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status=instance['status'],
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old_status=old_instance['status']))
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# vim:sw=4:ts=4:et:
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