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node.go
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node.go
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// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 kubernetes
import (
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/labels"
)
// NodeSource is a function that produces a slice of Nodes or an error.
type NodeSource func() ([]*corev1.Node, error)
// NodeLister is a lister of Nodes.
type NodeLister interface {
// List lists all Nodes that match the given selector.
List(selector labels.Selector) ([]*corev1.Node, error)
}
type nodeLister struct {
source NodeSource
}
// NewNodeLister creates a new NodeLister from the given NodeSource.
func NewNodeLister(source NodeSource) NodeLister {
return &nodeLister{source: source}
}
func filterNodes(source NodeSource, filter func(*corev1.Node) bool) ([]*corev1.Node, error) {
nodes, err := source()
if err != nil {
return nil, err
}
var out []*corev1.Node
for _, node := range nodes {
if filter(node) {
out = append(out, node)
}
}
return out, nil
}
func (d *nodeLister) List(selector labels.Selector) ([]*corev1.Node, error) {
return filterNodes(d.source, func(node *corev1.Node) bool {
return selector.Matches(labels.Set(node.Labels))
})
}