108 lines
3.3 KiB
Python
Executable File
108 lines
3.3 KiB
Python
Executable File
# Copyright (c) 2016 Mirantis, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from kuryr_kubernetes.handlers import dispatch
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from kuryr_kubernetes.handlers import health
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def object_kind(event):
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try:
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return event['object']['kind']
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except KeyError:
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return None
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def object_uid(event):
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try:
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return event['object']['metadata']['uid']
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except KeyError:
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return None
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class ResourceEventHandler(dispatch.EventConsumer, health.HealthHandler):
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"""Base class for K8s event handlers.
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Implementing classes should override both `OBJECT_KIND` and
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'OBJECT_WATCH_PATH' attributes.
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The `OBJECT_KIND` should be set to a valid Kubernetes object type
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name (e.g. 'Pod' or 'Namespace'; see [1] for more details).
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The `OBJECT_WATCH_PATH` should point to object's watched path,
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(e.g. for the 'Pod' case the OBJECT_WATCH_PATH should be '/api/v1/pods').
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Implementing classes are expected to override any or all of the
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`on_added`, `on_present`, `on_modified`, `on_deleted` methods that would
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be called depending on the type of the event (with K8s object as a single
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argument).
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[1] https://github.com/kubernetes/kubernetes/blob/release-1.4/docs/devel\
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/api-conventions.md#types-kinds
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"""
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OBJECT_KIND = None
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OBJECT_WATCH_PATH = None
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def __init__(self):
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super(ResourceEventHandler, self).__init__()
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def get_watch_path(self):
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return self.OBJECT_WATCH_PATH
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@property
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def consumes(self):
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return {object_kind: self.OBJECT_KIND}
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def _check_finalize(self, obj):
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deletion_timestamp = None
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try:
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deletion_timestamp = obj['metadata']['deletionTimestamp']
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except (KeyError, TypeError):
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pass
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return deletion_timestamp
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def __call__(self, event, *args, **kwargs):
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event_type = event.get('type')
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obj = event.get('object')
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if 'MODIFIED' == event_type:
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if self._check_finalize(obj):
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self.on_finalize(obj, *args, **kwargs)
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return
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self.on_modified(obj, *args, **kwargs)
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self.on_present(obj, *args, **kwargs)
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elif 'ADDED' == event_type:
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if self._check_finalize(obj):
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self.on_finalize(obj, *args, **kwargs)
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return
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self.on_added(obj, *args, **kwargs)
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self.on_present(obj, *args, **kwargs)
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elif 'DELETED' == event_type:
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self.on_deleted(obj, *args, **kwargs)
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def on_added(self, obj, *args, **kwargs):
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pass
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def on_present(self, obj, *args, **kwargs):
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pass
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def on_modified(self, obj, *args, **kwargs):
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pass
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def on_deleted(self, obj, *args, **kwargs):
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pass
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def on_finalize(self, obj, *args, **kwargs):
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pass
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