mirror of https://github.com/k3s-io/k3s
122 lines
3.6 KiB
Go
122 lines
3.6 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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// TopPodOptions contains all the options for running the top-pod cli command.
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type TopPodOptions struct {
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ResourceName string
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AllNamespaces bool
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PrintContainers bool
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Selector string
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Namespace 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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topPodLong = dedent.Dedent(`
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Display Resource (CPU/Memory/Storage) usage of pods.
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The 'top pod' command allows you to see the resource consumption of pods.`)
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topPodExample = dedent.Dedent(`
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# Show metrics for all pods in the default namespace
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kubectl top pod
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# Show metrics for all pods in the given namespace
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kubectl top pod --namespace=NAMESPACE
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# Show metrics for a given pod and its containers
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kubectl top pod POD_NAME --containers
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# Show metrics for the pods defined by label name=myLabel
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kubectl top pod -l name=myLabel`)
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)
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func NewCmdTopPod(f *cmdutil.Factory, out io.Writer) *cobra.Command {
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options := &TopPodOptions{}
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cmd := &cobra.Command{
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Use: "pod [NAME | -l label]",
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Short: "Display Resource (CPU/Memory/Storage) usage of pods",
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Long: topPodLong,
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Example: topPodExample,
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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.RunTopPod(); err != nil {
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cmdutil.CheckErr(err)
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}
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},
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Aliases: []string{"pods"},
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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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cmd.Flags().BoolVar(&options.PrintContainers, "containers", false, "If present, print usage of containers within a pod.")
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cmd.Flags().BoolVar(&options.AllNamespaces, "all-namespaces", false, "If present, list the requested object(s) across all namespaces. Namespace in current context is ignored even if specified with --namespace.")
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return cmd
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}
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// Complete completes all the required options for top.
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func (o *TopPodOptions) 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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o.Namespace, _, err = f.DefaultNamespace()
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if err != nil {
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return err
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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 *TopPodOptions) 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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// RunTop implements all the necessary functionality for top.
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func (o TopPodOptions) RunTopPod() error {
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metrics, err := o.Client.GetPodMetrics(o.Namespace, o.ResourceName, o.AllNamespaces, 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.PrintPodMetrics(metrics, o.PrintContainers, o.AllNamespaces)
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}
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