f0e1c206a9
This patch introduces ControllerPipeline which is an entry point handler for the Kuryr-Kubernetes controller. ControllerPipeline allows registering ResourceEventHandlers and ensures the proper handler is called for each event that is passed to the ControllerPipeline. Also it ensures the following behavior: - multiple ResourceEventHandlers can be registered for the same resource type (OBJECT_KIND) - failing handlers (i.e. ones that raise Exceptions) are retried until either the handler succeeds or a finite amount of time passes, in which case the most recent exception is logged - in case there are multiple handlers registered for the same resource type, all such handlers are considered independent (i.e. if one handler fails, other handlers will still be called regardless; and the order in which such handlers are called is not determined) - events for different Kubernetes objects can be handled concurrently - events for the same Kubernetes object are handled sequentially in the order of arrival Change-Id: Ib17e0c7a2790cdbc31be4f59d50972b43c272480 Partially-Implements: blueprint kuryr-k8s-integration
106 lines
3.7 KiB
Python
106 lines
3.7 KiB
Python
# 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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import sys
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from kuryr.lib._i18n import _LI, _LE
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from oslo_log import log as logging
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from oslo_service import service
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from kuryr_kubernetes import clients
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from kuryr_kubernetes import config
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from kuryr_kubernetes import constants
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from kuryr_kubernetes.controller.handlers import pipeline as h_pipeline
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from kuryr_kubernetes.handlers import k8s_base as h_k8s
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from kuryr_kubernetes import watcher
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LOG = logging.getLogger(__name__)
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class KuryrK8sService(service.Service):
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"""Kuryr-Kubernetes controller Service."""
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def __init__(self):
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super(KuryrK8sService, self).__init__()
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class DummyHandler(h_k8s.ResourceEventHandler):
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# TODO(ivc): remove once real handlers are ready
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def __init__(self):
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self.event_seq = 0
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def __call__(self, event):
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self.event_seq += 1
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if self.event_seq % 4:
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raise Exception(_LE("Dummy exception %s") % self.event_seq)
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super(DummyHandler, self).__call__(event)
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def on_added(self, event):
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LOG.debug("added: %s",
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event['object']['metadata']['selfLink'])
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def on_deleted(self, event):
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LOG.debug("deleted: %s",
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event['object']['metadata']['selfLink'])
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def on_modified(self, event):
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LOG.debug("modified: %s",
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event['object']['metadata']['selfLink'])
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def on_present(self, event):
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LOG.debug("present: %s",
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event['object']['metadata']['selfLink'])
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class DummyPodHandler(DummyHandler):
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OBJECT_KIND = constants.K8S_OBJ_POD
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class DummyServiceHandler(DummyHandler):
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OBJECT_KIND = constants.K8S_OBJ_SERVICE
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class DummyEndpointsHandler(DummyHandler):
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OBJECT_KIND = constants.K8S_OBJ_ENDPOINTS
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pipeline = h_pipeline.ControllerPipeline(self.tg)
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self.watcher = watcher.Watcher(pipeline, self.tg)
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# TODO(ivc): pluggable resource/handler registration
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for resource in ["pods", "services", "endpoints"]:
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self.watcher.add("%s/%s" % (constants.K8S_API_BASE, resource))
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pipeline.register(DummyPodHandler())
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pipeline.register(DummyServiceHandler())
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pipeline.register(DummyEndpointsHandler())
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def start(self):
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LOG.info(_LI("Service '%s' starting"), self.__class__.__name__)
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super(KuryrK8sService, self).start()
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self.watcher.start()
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LOG.info(_LI("Service '%s' started"), self.__class__.__name__)
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def wait(self):
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super(KuryrK8sService, self).wait()
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LOG.info(_LI("Service '%s' stopped"), self.__class__.__name__)
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def stop(self, graceful=False):
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LOG.info(_LI("Service '%s' stopping"), self.__class__.__name__)
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self.watcher.stop()
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super(KuryrK8sService, self).stop(graceful)
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def start():
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config.init(sys.argv[1:])
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config.setup_logging()
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clients.setup_clients()
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kuryrk8s_launcher = service.launch(config.CONF, KuryrK8sService())
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kuryrk8s_launcher.wait()
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