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package main
import (
"fmt"
"strings"
"time"
"encoding/json"
tm "github.com/buger/goterm"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/cmd/podman/formats"
"github.com/containers/libpod/cmd/podman/libpodruntime"
"github.com/containers/libpod/libpod"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"github.com/ulule/deepcopier"
)
var (
podStatsCommand cliconfig.PodStatsValues
podStatsDescription = "Display a live stream of resource usage statistics for the containers in or more pods"
_podStatsCommand = &cobra.Command{
Use: "stats",
Short: "Display percentage of CPU, memory, network I/O, block I/O and PIDs for containers in one or more pods",
Long: podStatsDescription,
RunE: func(cmd *cobra.Command, args []string) error {
podStatsCommand.InputArgs = args
podStatsCommand.GlobalFlags = MainGlobalOpts
return podStatsCmd(&podStatsCommand)
},
Example: "[POD_NAME_OR_ID]",
}
)
func init() {
podStatsCommand.Command = _podStatsCommand
flags := podStatsCommand.Flags()
flags.BoolVarP(&podStatsCommand.All, "all", "a", false, "Provide stats for all running pods")
flags.StringVar(&podStatsCommand.Format, "format", "", "Pretty-print container statistics to JSON or using a Go template")
flags.BoolVarP(&podStatsCommand.Latest, "latest", "l", false, "Provide stats on the latest pod podman is aware of")
flags.BoolVar(&podStatsCommand.NoStream, "no-stream", false, "Disable streaming stats and only pull the first result, default setting is false")
flags.BoolVar(&podStatsCommand.NoReset, "no-reset", false, "Disable resetting the screen between intervals")
}
func podStatsCmd(c *cliconfig.PodStatsValues) error {
var (
podFunc func() ([]*libpod.Pod, error)
)
format := c.Format
all := c.All
latest := c.Latest
ctr := 0
if all {
ctr += 1
}
if latest {
ctr += 1
}
if len(c.InputArgs) > 0 {
ctr += 1
}
if ctr > 1 {
return errors.Errorf("--all, --latest and containers cannot be used together")
} else if ctr == 0 {
// If user didn't specify, imply --all
all = true
}
runtime, err := libpodruntime.GetRuntime(&c.PodmanCommand)
if err != nil {
return errors.Wrapf(err, "could not get runtime")
}
defer runtime.Shutdown(false)
times := -1
if c.NoStream {
times = 1
}
if len(c.InputArgs) > 0 {
podFunc = func() ([]*libpod.Pod, error) { return getPodsByList(c.InputArgs, runtime) }
} else if latest {
podFunc = func() ([]*libpod.Pod, error) {
latestPod, err := runtime.GetLatestPod()
if err != nil {
return nil, err
}
return []*libpod.Pod{latestPod}, err
}
} else if all {
podFunc = runtime.GetAllPods
} else {
podFunc = runtime.GetRunningPods
}
pods, err := podFunc()
if err != nil {
return errors.Wrapf(err, "unable to get a list of pods")
}
// First we need to get an initial pass of pod/ctr stats (these are not printed)
var podStats []*libpod.PodContainerStats
for _, p := range pods {
cons, err := p.AllContainersByID()
if err != nil {
return err
}
emptyStats := make(map[string]*libpod.ContainerStats)
// Iterate the pods container ids and make blank stats for them
for _, c := range cons {
emptyStats[c] = &libpod.ContainerStats{}
}
ps := libpod.PodContainerStats{
Pod: p,
ContainerStats: emptyStats,
}
podStats = append(podStats, &ps)
}
// Create empty container stat results for our first pass
var previousPodStats []*libpod.PodContainerStats
for _, p := range pods {
cs := make(map[string]*libpod.ContainerStats)
pcs := libpod.PodContainerStats{
Pod: p,
ContainerStats: cs,
}
previousPodStats = append(previousPodStats, &pcs)
}
step := 1
if times == -1 {
times = 1
step = 0
}
for i := 0; i < times; i += step {
var newStats []*libpod.PodContainerStats
for _, p := range pods {
prevStat := getPreviousPodContainerStats(p.ID(), previousPodStats)
newPodStats, err := p.GetPodStats(prevStat)
if errors.Cause(err) == libpod.ErrNoSuchPod {
continue
}
if err != nil {
return err
}
newPod := libpod.PodContainerStats{
Pod: p,
ContainerStats: newPodStats,
}
newStats = append(newStats, &newPod)
}
//Output
if strings.ToLower(format) != formats.JSONString && !c.NoReset {
tm.Clear()
tm.MoveCursor(1, 1)
tm.Flush()
}
if strings.ToLower(format) == formats.JSONString {
outputJson(newStats)
} else {
outputToStdOut(newStats)
}
time.Sleep(time.Second)
previousPodStats := new([]*libpod.PodContainerStats)
deepcopier.Copy(newStats).To(previousPodStats)
pods, err = podFunc()
if err != nil {
return err
}
}
return nil
}
func outputToStdOut(stats []*libpod.PodContainerStats) {
outFormat := ("%-14s %-14s %-12s %-6s %-19s %-6s %-19s %-19s %-4s\n")
fmt.Printf(outFormat, "POD", "CID", "NAME", "CPU %", "MEM USAGE/ LIMIT", "MEM %", "NET IO", "BLOCK IO", "PIDS")
for _, i := range stats {
if len(i.ContainerStats) == 0 {
fmt.Printf(outFormat, i.Pod.ID()[:12], "--", "--", "--", "--", "--", "--", "--", "--")
}
for _, c := range i.ContainerStats {
cpu := floatToPercentString(c.CPU)
memUsage := combineHumanValues(c.MemUsage, c.MemLimit)
memPerc := floatToPercentString(c.MemPerc)
netIO := combineHumanValues(c.NetInput, c.NetOutput)
blockIO := combineHumanValues(c.BlockInput, c.BlockOutput)
pids := pidsToString(c.PIDs)
containerName := c.Name
if len(c.Name) > 10 {
containerName = containerName[:10]
}
fmt.Printf(outFormat, i.Pod.ID()[:12], c.ContainerID[:12], containerName, cpu, memUsage, memPerc, netIO, blockIO, pids)
}
}
fmt.Println()
}
func getPreviousPodContainerStats(podID string, prev []*libpod.PodContainerStats) map[string]*libpod.ContainerStats {
for _, p := range prev {
if podID == p.Pod.ID() {
return p.ContainerStats
}
}
return map[string]*libpod.ContainerStats{}
}
func outputJson(stats []*libpod.PodContainerStats) error {
b, err := json.MarshalIndent(&stats, "", " ")
if err != nil {
return err
}
fmt.Println(string(b))
return nil
}
func getPodsByList(podList []string, r *libpod.Runtime) ([]*libpod.Pod, error) {
var (
pods []*libpod.Pod
)
for _, p := range podList {
pod, err := r.LookupPod(p)
if err != nil {
return nil, err
}
pods = append(pods, pod)
}
return pods, nil
}
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