167 lines
6.8 KiB
Python
167 lines
6.8 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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from os_vif import objects as obj_vif
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from oslo_log import log as logging
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from oslo_serialization import jsonutils
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from kuryr_kubernetes import clients
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from kuryr_kubernetes import constants
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from kuryr_kubernetes.controller.drivers import base as drivers
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from kuryr_kubernetes import exceptions as k_exc
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from kuryr_kubernetes.handlers import k8s_base
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LOG = logging.getLogger(__name__)
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class VIFHandler(k8s_base.ResourceEventHandler):
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"""Controller side of VIF binding process for Kubernetes pods.
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`VIFHandler` runs on the Kuryr-Kubernetes controller and together with
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the CNI driver (that runs on 'kubelet' nodes) is responsible for providing
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networking to Kubernetes pods. `VIFHandler` relies on a set of drivers
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(which are responsible for managing Neutron resources) to define the VIF
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objects and pass them to the CNI driver in form of the Kubernetes pod
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annotation.
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"""
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OBJECT_KIND = constants.K8S_OBJ_POD
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OBJECT_WATCH_PATH = "%s/%s" % (constants.K8S_API_BASE, "pods")
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def __init__(self):
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super(VIFHandler, self).__init__()
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self._drv_project = drivers.PodProjectDriver.get_instance()
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self._drv_subnets = drivers.PodSubnetsDriver.get_instance()
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self._drv_sg = drivers.PodSecurityGroupsDriver.get_instance()
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# REVISIT(ltomasbo): The VIF Handler should not be aware of the pool
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# directly. Due to the lack of a mechanism to load and set the
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# VIFHandler driver, for now it is aware of the pool driver, but this
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# will be reverted as soon as a mechanism is in place.
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self._drv_vif_pool = drivers.VIFPoolDriver.get_instance(
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driver_alias='multi_pool')
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self._drv_vif_pool.set_vif_driver()
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self._drv_multi_vif = drivers.MultiVIFDriver.get_enabled_drivers()
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def on_present(self, pod):
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if self._is_host_network(pod) or not self._is_pending_node(pod):
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# REVISIT(ivc): consider an additional configurable check that
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# would allow skipping pods to enable heterogeneous environments
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# where certain pods/namespaces/nodes can be managed by other
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# networking solutions/CNI drivers.
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return
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vifs = self._get_vifs(pod)
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if not vifs:
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vifs = {}
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project_id = self._drv_project.get_project(pod)
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security_groups = self._drv_sg.get_security_groups(pod, project_id)
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subnets = self._drv_subnets.get_subnets(pod, project_id)
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# Request the default interface of pod
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main_vif = self._drv_vif_pool.request_vif(
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pod, project_id, subnets, security_groups)
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vifs[constants.DEFAULT_IFNAME] = main_vif
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# Request the additional interfaces from multiple dirvers
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additional_vifs = []
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for driver in self._drv_multi_vif:
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additional_vifs.extend(
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driver.request_additional_vifs(
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pod, project_id, security_groups))
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if additional_vifs:
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for i, vif in enumerate(additional_vifs, start=1):
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vifs[constants.ADDITIONAL_IFNAME_PREFIX + str(i)] = vif
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try:
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self._set_vifs(pod, vifs)
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except k_exc.K8sClientException as ex:
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LOG.debug("Failed to set annotation: %s", ex)
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# FIXME(ivc): improve granularity of K8sClient exceptions:
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# only resourceVersion conflict should be ignored
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for ifname, vif in vifs.items():
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self._drv_for_vif(vif).release_vif(pod, vif, project_id,
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security_groups)
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else:
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changed = False
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for ifname, vif in vifs.items():
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if not vif.active:
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self._drv_for_vif(vif).activate_vif(pod, vif)
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changed = True
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if changed:
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self._set_vifs(pod, vifs)
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def on_deleted(self, pod):
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if self._is_host_network(pod):
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return
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project_id = self._drv_project.get_project(pod)
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security_groups = self._drv_sg.get_security_groups(pod, project_id)
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vifs = self._get_vifs(pod)
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for ifname, vif in vifs.items():
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self._drv_for_vif(vif).release_vif(pod, vif, project_id,
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security_groups)
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def _drv_for_vif(self, vif):
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# TODO(danil): a better polymorphism is required here
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return self._drv_vif_pool
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@staticmethod
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def _is_host_network(pod):
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return pod['spec'].get('hostNetwork', False)
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@staticmethod
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def _is_pending_node(pod):
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"""Checks if Pod is in PENDGING status and has node assigned."""
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try:
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return (pod['spec']['nodeName'] and
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pod['status']['phase'] == constants.K8S_POD_STATUS_PENDING)
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except KeyError:
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return False
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def _set_vifs(self, pod, vifs):
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# TODO(ivc): extract annotation interactions
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if not vifs:
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LOG.debug("Removing VIFs annotation: %r", vifs)
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annotation = None
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else:
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vifs_dict = {}
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for ifname, vif in vifs.items():
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vif.obj_reset_changes(recursive=True)
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vifs_dict[ifname] = vif.obj_to_primitive()
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annotation = jsonutils.dumps(vifs_dict,
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sort_keys=True)
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LOG.debug("Setting VIFs annotation: %r", annotation)
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k8s = clients.get_kubernetes_client()
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k8s.annotate(pod['metadata']['selfLink'],
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{constants.K8S_ANNOTATION_VIF: annotation},
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resource_version=pod['metadata']['resourceVersion'])
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def _get_vifs(self, pod):
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# TODO(ivc): same as '_set_vif'
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try:
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annotations = pod['metadata']['annotations']
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vif_annotation = annotations[constants.K8S_ANNOTATION_VIF]
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except KeyError:
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return {}
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vif_annotation = jsonutils.loads(vif_annotation)
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vifs = {
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ifname: obj_vif.vif.VIFBase.obj_from_primitive(vif_obj) for
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ifname, vif_obj in vif_annotation.items()
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}
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LOG.debug("Got VIFs from annotation: %r", vifs)
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return vifs
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