mirror of https://github.com/k3s-io/k3s
64 lines
2.5 KiB
Go
64 lines
2.5 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package polymorphichelpers
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import (
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"fmt"
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"k8s.io/apimachinery/pkg/runtime"
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api "k8s.io/kubernetes/pkg/apis/core"
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"k8s.io/kubernetes/pkg/apis/extensions"
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"k8s.io/kubernetes/pkg/kubectl"
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)
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// mapBasedSelectorForObject returns the map-based selector associated with the provided object. If a
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// new set-based selector is provided, an error is returned if the selector cannot be converted to a
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// map-based selector
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func mapBasedSelectorForObject(object runtime.Object) (string, error) {
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// TODO: replace with a swagger schema based approach (identify pod selector via schema introspection)
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switch t := object.(type) {
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case *api.ReplicationController:
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return kubectl.MakeLabels(t.Spec.Selector), nil
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case *api.Pod:
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if len(t.Labels) == 0 {
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return "", fmt.Errorf("the pod has no labels and cannot be exposed")
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}
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return kubectl.MakeLabels(t.Labels), nil
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case *api.Service:
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if t.Spec.Selector == nil {
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return "", fmt.Errorf("the service has no pod selector set")
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}
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return kubectl.MakeLabels(t.Spec.Selector), nil
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case *extensions.Deployment:
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// TODO(madhusudancs): Make this smarter by admitting MatchExpressions with Equals
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// operator, DoubleEquals operator and In operator with only one element in the set.
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if len(t.Spec.Selector.MatchExpressions) > 0 {
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return "", fmt.Errorf("couldn't convert expressions - \"%+v\" to map-based selector format", t.Spec.Selector.MatchExpressions)
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}
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return kubectl.MakeLabels(t.Spec.Selector.MatchLabels), nil
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case *extensions.ReplicaSet:
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// TODO(madhusudancs): Make this smarter by admitting MatchExpressions with Equals
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// operator, DoubleEquals operator and In operator with only one element in the set.
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if len(t.Spec.Selector.MatchExpressions) > 0 {
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return "", fmt.Errorf("couldn't convert expressions - \"%+v\" to map-based selector format", t.Spec.Selector.MatchExpressions)
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}
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return kubectl.MakeLabels(t.Spec.Selector.MatchLabels), nil
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default:
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return "", fmt.Errorf("cannot extract pod selector from %T", object)
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}
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}
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