96 lines
3.6 KiB
Go
96 lines
3.6 KiB
Go
/*
|
|
Copyright 2016 The Kubernetes Authors.
|
|
|
|
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.
|
|
*/
|
|
|
|
package util
|
|
|
|
import (
|
|
"k8s.io/kubernetes/pkg/api"
|
|
"k8s.io/kubernetes/pkg/api/unversioned"
|
|
"k8s.io/kubernetes/pkg/labels"
|
|
"k8s.io/kubernetes/pkg/util/sets"
|
|
)
|
|
|
|
// FilterPodsByNameSpaces filters the pods based the given list of namespaces,
|
|
// empty set of namespaces means all namespaces.
|
|
func FilterPodsByNameSpaces(names sets.String, pods []*api.Pod) []*api.Pod {
|
|
if len(pods) == 0 || len(names) == 0 {
|
|
return pods
|
|
}
|
|
result := []*api.Pod{}
|
|
for _, pod := range pods {
|
|
if names.Has(pod.Namespace) {
|
|
result = append(result, pod)
|
|
}
|
|
}
|
|
return result
|
|
}
|
|
|
|
// GetNamespacesFromPodAffinityTerm returns a set of names
|
|
// according to the namespaces indicated in podAffinityTerm.
|
|
// if the NameSpaces is nil considers the given pod's namespace
|
|
// if the Namespaces is empty list then considers all the namespaces
|
|
func GetNamespacesFromPodAffinityTerm(pod *api.Pod, podAffinityTerm api.PodAffinityTerm) sets.String {
|
|
names := sets.String{}
|
|
if podAffinityTerm.Namespaces == nil {
|
|
names.Insert(pod.Namespace)
|
|
} else if len(podAffinityTerm.Namespaces) != 0 {
|
|
names.Insert(podAffinityTerm.Namespaces...)
|
|
}
|
|
return names
|
|
}
|
|
|
|
// nodesHaveSameTopologyKeyInternal checks if nodeA and nodeB have same label value with given topologyKey as label key.
|
|
func nodesHaveSameTopologyKeyInternal(nodeA, nodeB *api.Node, topologyKey string) bool {
|
|
return nodeA.Labels != nil && nodeB.Labels != nil && len(nodeA.Labels[topologyKey]) > 0 && nodeA.Labels[topologyKey] == nodeB.Labels[topologyKey]
|
|
}
|
|
|
|
type Topologies struct {
|
|
DefaultKeys []string
|
|
}
|
|
|
|
// NodesHaveSameTopologyKey checks if nodeA and nodeB have same label value with given topologyKey as label key.
|
|
// If the topologyKey is nil/empty, check if the two nodes have any of the default topologyKeys, and have same corresponding label value.
|
|
func (tps *Topologies) NodesHaveSameTopologyKey(nodeA, nodeB *api.Node, topologyKey string) bool {
|
|
if len(topologyKey) == 0 {
|
|
// assumes this is allowed only for PreferredDuringScheduling pod anti-affinity (ensured by api/validation)
|
|
for _, defaultKey := range tps.DefaultKeys {
|
|
if nodesHaveSameTopologyKeyInternal(nodeA, nodeB, defaultKey) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
} else {
|
|
return nodesHaveSameTopologyKeyInternal(nodeA, nodeB, topologyKey)
|
|
}
|
|
}
|
|
|
|
// CheckIfPodMatchPodAffinityTerm checks if podB's affinity request is compatible with podA
|
|
// TODO: Get rid this method. We should avoid computing Namespaces and selectors multiple times
|
|
// and check them on higher levels and then use NodesHaveSameTopologyKey method.
|
|
func (tps *Topologies) CheckIfPodMatchPodAffinityTerm(podA *api.Pod, nodeA, nodeB *api.Node, podB *api.Pod, podBAffinityTerm api.PodAffinityTerm) (bool, error) {
|
|
names := GetNamespacesFromPodAffinityTerm(podB, podBAffinityTerm)
|
|
if len(names) != 0 && !names.Has(podA.Namespace) {
|
|
return false, nil
|
|
}
|
|
|
|
labelSelector, err := unversioned.LabelSelectorAsSelector(podBAffinityTerm.LabelSelector)
|
|
if err != nil || !labelSelector.Matches(labels.Set(podA.Labels)) {
|
|
return false, err
|
|
}
|
|
|
|
return tps.NodesHaveSameTopologyKey(nodeA, nodeB, podBAffinityTerm.TopologyKey), nil
|
|
}
|