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108 lines
2.8 KiB
Go
108 lines
2.8 KiB
Go
/*
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Copyright 2016 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 cmd
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import (
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"errors"
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"io"
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cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
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"k8s.io/kubernetes/pkg/kubectl/metricsutil"
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"github.com/renstrom/dedent"
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"github.com/spf13/cobra"
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)
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// TopNodeOptions contains all the options for running the top-node cli command.
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type TopNodeOptions struct {
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ResourceName string
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Selector string
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Client *metricsutil.HeapsterMetricsClient
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Printer *metricsutil.TopCmdPrinter
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}
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var (
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topNodeLong = dedent.Dedent(`
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Display Resource (CPU/Memory/Storage) usage of nodes.
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The top-node command allows you to see the resource consumption of nodes.`)
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topNodeExample = dedent.Dedent(`
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# Show metrics for all nodes
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kubectl top node
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# Show metrics for a given node
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kubectl top node NODE_NAME`)
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)
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func NewCmdTopNode(f *cmdutil.Factory, out io.Writer) *cobra.Command {
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options := &TopNodeOptions{}
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cmd := &cobra.Command{
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Use: "node [NAME | -l label]",
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Short: "Display Resource (CPU/Memory/Storage) usage of nodes",
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Long: topNodeLong,
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Example: topNodeExample,
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Run: func(cmd *cobra.Command, args []string) {
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if err := options.Complete(f, cmd, args, out); err != nil {
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cmdutil.CheckErr(err)
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}
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if err := options.Validate(); err != nil {
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cmdutil.CheckErr(cmdutil.UsageError(cmd, err.Error()))
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}
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if err := options.RunTopNode(); err != nil {
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cmdutil.CheckErr(err)
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}
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},
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Aliases: []string{"nodes"},
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}
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cmd.Flags().StringVarP(&options.Selector, "selector", "l", "", "Selector (label query) to filter on")
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return cmd
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}
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func (o *TopNodeOptions) Complete(f *cmdutil.Factory, cmd *cobra.Command, args []string, out io.Writer) error {
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var err error
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if len(args) == 1 {
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o.ResourceName = args[0]
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} else if len(args) > 1 {
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return cmdutil.UsageError(cmd, cmd.Use)
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}
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cli, err := f.Client()
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if err != nil {
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return err
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}
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o.Client = metricsutil.DefaultHeapsterMetricsClient(cli)
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o.Printer = metricsutil.NewTopCmdPrinter(out)
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return nil
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}
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func (o *TopNodeOptions) Validate() error {
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if len(o.ResourceName) > 0 && len(o.Selector) > 0 {
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return errors.New("only one of NAME or --selector can be provided")
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}
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return nil
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}
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func (o TopNodeOptions) RunTopNode() error {
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metrics, err := o.Client.GetNodeMetrics(o.ResourceName, o.Selector)
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if err != nil {
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return err
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}
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return o.Printer.PrintNodeMetrics(metrics)
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}
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