302 lines
8.0 KiB
Go
302 lines
8.0 KiB
Go
package main
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import (
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"fmt"
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"html/template"
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"os"
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"reflect"
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"strings"
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"text/tabwriter"
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"time"
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tm "github.com/buger/goterm"
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"github.com/containers/buildah/pkg/formats"
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"github.com/containers/libpod/cmd/podman/cliconfig"
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"github.com/containers/libpod/libpod"
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"github.com/containers/libpod/libpod/define"
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"github.com/containers/libpod/pkg/adapter"
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"github.com/pkg/errors"
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"github.com/spf13/cobra"
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)
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var (
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podStatsCommand cliconfig.PodStatsValues
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podStatsDescription = `For each specified pod this command will display percentage of CPU, memory, network I/O, block I/O and PIDs for containers in one the pods.`
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_podStatsCommand = &cobra.Command{
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Use: "stats [flags] [POD...]",
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Short: "Display a live stream of resource usage statistics for the containers in one or more pods",
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Long: podStatsDescription,
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RunE: func(cmd *cobra.Command, args []string) error {
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podStatsCommand.InputArgs = args
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podStatsCommand.GlobalFlags = MainGlobalOpts
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podStatsCommand.Remote = remoteclient
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return podStatsCmd(&podStatsCommand)
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},
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Example: `podman stats -a --no-stream
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podman stats --no-reset ctrID
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podman stats --no-stream --format "table {{.ID}} {{.Name}} {{.MemUsage}}" ctrID`,
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}
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)
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func init() {
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podStatsCommand.Command = _podStatsCommand
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podStatsCommand.SetHelpTemplate(HelpTemplate())
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podStatsCommand.SetUsageTemplate(UsageTemplate())
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flags := podStatsCommand.Flags()
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flags.BoolVarP(&podStatsCommand.All, "all", "a", false, "Provide stats for all running pods")
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flags.StringVar(&podStatsCommand.Format, "format", "", "Pretty-print container statistics to JSON or using a Go template")
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flags.BoolVarP(&podStatsCommand.Latest, "latest", "l", false, "Provide stats on the latest pod podman is aware of")
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flags.BoolVar(&podStatsCommand.NoStream, "no-stream", false, "Disable streaming stats and only pull the first result, default setting is false")
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flags.BoolVar(&podStatsCommand.NoReset, "no-reset", false, "Disable resetting the screen between intervals")
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markFlagHiddenForRemoteClient("latest", flags)
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}
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func podStatsCmd(c *cliconfig.PodStatsValues) error {
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if os.Geteuid() != 0 {
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return errors.New("stats is not supported in rootless mode")
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}
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format := c.Format
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all := c.All
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latest := c.Latest
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ctr := 0
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if all {
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ctr += 1
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}
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if latest {
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ctr += 1
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}
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if len(c.InputArgs) > 0 {
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ctr += 1
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}
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if ctr > 1 {
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return errors.Errorf("--all, --latest and containers cannot be used together")
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}
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runtime, err := adapter.GetRuntime(getContext(), &c.PodmanCommand)
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if err != nil {
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return errors.Wrapf(err, "could not get runtime")
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}
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defer runtime.DeferredShutdown(false)
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times := -1
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if c.NoStream {
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times = 1
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}
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pods, err := runtime.GetStatPods(c)
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if err != nil {
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return errors.Wrapf(err, "unable to get a list of pods")
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}
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// First we need to get an initial pass of pod/ctr stats (these are not printed)
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var podStats []*adapter.PodContainerStats
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for _, p := range pods {
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cons, err := p.AllContainersByID()
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if err != nil {
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return err
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}
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emptyStats := make(map[string]*libpod.ContainerStats)
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// Iterate the pods container ids and make blank stats for them
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for _, c := range cons {
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emptyStats[c] = &libpod.ContainerStats{}
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}
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ps := adapter.PodContainerStats{
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Pod: p,
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ContainerStats: emptyStats,
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}
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podStats = append(podStats, &ps)
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}
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// Create empty container stat results for our first pass
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var previousPodStats []*adapter.PodContainerStats
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for _, p := range pods {
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cs := make(map[string]*libpod.ContainerStats)
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pcs := adapter.PodContainerStats{
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Pod: p,
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ContainerStats: cs,
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}
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previousPodStats = append(previousPodStats, &pcs)
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}
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step := 1
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if times == -1 {
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times = 1
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step = 0
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}
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headerNames := make(map[string]string)
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if c.Format != "" {
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// Make a map of the field names for the headers
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v := reflect.ValueOf(podStatOut{})
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t := v.Type()
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for i := 0; i < t.NumField(); i++ {
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value := strings.ToUpper(splitCamelCase(t.Field(i).Name))
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switch value {
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case "CPU":
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value = value + " %"
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case "MEM":
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value = value + " %"
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case "MEM USAGE":
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value = "MEM USAGE / LIMIT"
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}
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headerNames[t.Field(i).Name] = value
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}
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}
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for i := 0; i < times; i += step {
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var newStats []*adapter.PodContainerStats
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for _, p := range pods {
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prevStat := getPreviousPodContainerStats(p.ID(), previousPodStats)
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newPodStats, err := p.GetPodStats(prevStat)
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if errors.Cause(err) == define.ErrNoSuchPod {
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continue
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}
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if err != nil {
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return err
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}
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newPod := adapter.PodContainerStats{
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Pod: p,
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ContainerStats: newPodStats,
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}
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newStats = append(newStats, &newPod)
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}
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//Output
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if strings.ToLower(format) != formats.JSONString && !c.NoReset {
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tm.Clear()
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tm.MoveCursor(1, 1)
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tm.Flush()
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}
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if strings.ToLower(format) == formats.JSONString {
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if err := outputJson(newStats); err != nil {
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return err
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}
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} else {
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results := podContainerStatsToPodStatOut(newStats)
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if len(format) == 0 {
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outputToStdOut(results)
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} else {
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if err := printPSFormat(c.Format, results, headerNames); err != nil {
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return err
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}
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}
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}
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time.Sleep(time.Second)
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previousPodStats := new([]*libpod.PodContainerStats)
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if err := libpod.JSONDeepCopy(newStats, previousPodStats); err != nil {
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return err
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}
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pods, err = runtime.GetStatPods(c)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func podContainerStatsToPodStatOut(stats []*adapter.PodContainerStats) []*podStatOut {
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var out []*podStatOut
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for _, p := range stats {
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for _, c := range p.ContainerStats {
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o := podStatOut{
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CPU: floatToPercentString(c.CPU),
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MemUsage: combineHumanValues(c.MemUsage, c.MemLimit),
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Mem: floatToPercentString(c.MemPerc),
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NetIO: combineHumanValues(c.NetInput, c.NetOutput),
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BlockIO: combineHumanValues(c.BlockInput, c.BlockOutput),
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PIDS: pidsToString(c.PIDs),
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CID: c.ContainerID[:12],
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Name: c.Name,
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Pod: p.Pod.ID()[:12],
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}
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out = append(out, &o)
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}
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}
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return out
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}
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type podStatOut struct {
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CPU string
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MemUsage string
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Mem string
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NetIO string
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BlockIO string
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PIDS string
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Pod string
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CID string
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Name string
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}
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func printPSFormat(format string, stats []*podStatOut, headerNames map[string]string) error {
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if len(stats) == 0 {
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return nil
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}
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// Use a tabwriter to align column format
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w := tabwriter.NewWriter(os.Stdout, 0, 0, 3, ' ', 0)
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// Spit out the header if "table" is present in the format
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if strings.HasPrefix(format, "table") {
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hformat := strings.Replace(strings.TrimSpace(format[5:]), " ", "\t", -1)
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format = hformat
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headerTmpl, err := template.New("header").Parse(hformat)
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if err != nil {
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return err
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}
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if err := headerTmpl.Execute(w, headerNames); err != nil {
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return err
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}
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fmt.Fprintln(w, "")
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}
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// Spit out the data rows now
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dataTmpl, err := template.New("data").Parse(format)
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if err != nil {
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return err
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}
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for _, container := range stats {
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if err := dataTmpl.Execute(w, container); err != nil {
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return err
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}
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fmt.Fprintln(w, "")
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}
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// Flush the writer
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return w.Flush()
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}
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func outputToStdOut(stats []*podStatOut) {
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w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
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outFormat := "%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\n"
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fmt.Fprintf(w, outFormat, "POD", "CID", "NAME", "CPU %", "MEM USAGE/ LIMIT", "MEM %", "NET IO", "BLOCK IO", "PIDS")
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for _, i := range stats {
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if len(stats) == 0 {
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fmt.Fprintf(w, outFormat, i.Pod, "--", "--", "--", "--", "--", "--", "--", "--")
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} else {
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fmt.Fprintf(w, outFormat, i.Pod, i.CID, i.Name, i.CPU, i.MemUsage, i.Mem, i.NetIO, i.BlockIO, i.PIDS)
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}
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}
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w.Flush()
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}
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func getPreviousPodContainerStats(podID string, prev []*adapter.PodContainerStats) map[string]*libpod.ContainerStats {
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for _, p := range prev {
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if podID == p.Pod.ID() {
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return p.ContainerStats
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}
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}
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return map[string]*libpod.ContainerStats{}
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}
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func outputJson(stats []*adapter.PodContainerStats) error {
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b, err := json.MarshalIndent(&stats, "", " ")
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if err != nil {
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return err
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}
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fmt.Println(string(b))
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return nil
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}
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