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