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package main
import (
"encoding/json"
"fmt"
"os"
"strings"
"text/template"
"time"
"github.com/docker/go-units"
tm "github.com/buger/goterm"
"github.com/projectatomic/libpod/libkpod"
"github.com/projectatomic/libpod/oci"
"github.com/pkg/errors"
"github.com/urfave/cli"
)
var printf func(format string, a ...interface{}) (n int, err error)
var println func(a ...interface{}) (n int, err error)
type statsOutputParams struct {
Container string
ID string
CPUPerc string
MemUsage string
MemPerc string
NetIO string
BlockIO string
PIDs uint64
}
var (
statsFlags = []cli.Flag{
cli.BoolFlag{
Name: "all, a",
Usage: "show all containers. Only running containers are shown by default. The default is false",
},
cli.BoolFlag{
Name: "no-stream",
Usage: "disable streaming stats and only pull the first result, default setting is false",
},
cli.StringFlag{
Name: "format",
Usage: "pretty-print container statistics using a Go template",
},
cli.BoolFlag{
Name: "json",
Usage: "output container statistics in json format",
},
}
statsDescription = "display a live stream of one or more containers' resource usage statistics"
statsCommand = cli.Command{
Name: "stats",
Usage: "Display percentage of CPU, memory, network I/O, block I/O and PIDs for one or more containers",
Description: statsDescription,
Flags: statsFlags,
Action: statsCmd,
ArgsUsage: "",
}
)
func statsCmd(c *cli.Context) error {
if err := validateFlags(c, statsFlags); err != nil {
return err
}
config, err := getConfig(c)
if err != nil {
return errors.Wrapf(err, "could not read config")
}
containerServer, err := libkpod.New(config)
if err != nil {
return errors.Wrapf(err, "could not create container server")
}
defer containerServer.Shutdown()
err = containerServer.Update()
if err != nil {
return errors.Wrapf(err, "could not update list of containers")
}
times := -1
if c.Bool("no-stream") {
times = 1
}
statsChan := make(chan []*libkpod.ContainerStats)
// iterate over the channel until it is closed
go func() {
// print using goterm
printf = tm.Printf
println = tm.Println
for stats := range statsChan {
// Continually refresh statistics
tm.Clear()
tm.MoveCursor(1, 1)
outputStats(stats, c.String("format"), c.Bool("json"))
tm.Flush()
time.Sleep(time.Second)
}
}()
return getStats(containerServer, c.Args(), c.Bool("all"), statsChan, times)
}
func getStats(server *libkpod.ContainerServer, args []string, all bool, statsChan chan []*libkpod.ContainerStats, times int) error {
ctrs, err := server.ListContainers(isRunning, ctrInList(args))
if err != nil {
return err
}
containerStats := map[string]*libkpod.ContainerStats{}
for _, ctr := range ctrs {
initialStats, err := server.GetContainerStats(ctr, &libkpod.ContainerStats{})
if err != nil {
return err
}
containerStats[ctr.ID()] = initialStats
}
step := 1
if times == -1 {
times = 1
step = 0
}
for i := 0; i < times; i += step {
reportStats := []*libkpod.ContainerStats{}
for _, ctr := range ctrs {
id := ctr.ID()
if _, ok := containerStats[ctr.ID()]; !ok {
initialStats, err := server.GetContainerStats(ctr, &libkpod.ContainerStats{})
if err != nil {
return err
}
containerStats[id] = initialStats
}
stats, err := server.GetContainerStats(ctr, containerStats[id])
if err != nil {
return err
}
// replace the previous measurement with the current one
containerStats[id] = stats
reportStats = append(reportStats, stats)
}
statsChan <- reportStats
err := server.Update()
if err != nil {
return err
}
ctrs, err = server.ListContainers(isRunning, ctrInList(args))
if err != nil {
return err
}
}
return nil
}
func outputStats(stats []*libkpod.ContainerStats, format string, json bool) error {
if format == "" {
outputStatsHeader()
}
if json {
return outputStatsAsJSON(stats)
}
var err error
for _, s := range stats {
if format == "" {
outputStatsUsingFormatString(s)
} else {
params := getStatsOutputParams(s)
err2 := outputStatsUsingTemplate(format, params)
if err2 != nil {
err = errors.Wrapf(err, err2.Error())
}
}
}
return err
}
func outputStatsHeader() {
printf("%-64s %-16s %-32s %-16s %-24s %-24s %s\n", "CONTAINER", "CPU %", "MEM USAGE / MEM LIMIT", "MEM %", "NET I/O", "BLOCK I/O", "PIDS")
}
func outputStatsUsingFormatString(stats *libkpod.ContainerStats) {
printf("%-64s %-16s %-32s %-16s %-24s %-24s %d\n", stats.Container, floatToPercentString(stats.CPU), combineHumanValues(stats.MemUsage, stats.MemLimit), floatToPercentString(stats.MemPerc), combineHumanValues(stats.NetInput, stats.NetOutput), combineHumanValues(stats.BlockInput, stats.BlockOutput), stats.PIDs)
}
func combineHumanValues(a, b uint64) string {
return fmt.Sprintf("%s / %s", units.HumanSize(float64(a)), units.HumanSize(float64(b)))
}
func floatToPercentString(f float64) string {
return fmt.Sprintf("%.2f %s", f, "%")
}
func getStatsOutputParams(stats *libkpod.ContainerStats) statsOutputParams {
return statsOutputParams{
Container: stats.Container,
ID: stats.Container,
CPUPerc: floatToPercentString(stats.CPU),
MemUsage: combineHumanValues(stats.MemUsage, stats.MemLimit),
MemPerc: floatToPercentString(stats.MemPerc),
NetIO: combineHumanValues(stats.NetInput, stats.NetOutput),
BlockIO: combineHumanValues(stats.BlockInput, stats.BlockOutput),
PIDs: stats.PIDs,
}
}
func outputStatsUsingTemplate(format string, params statsOutputParams) error {
tmpl, err := template.New("stats").Parse(format)
if err != nil {
return errors.Wrapf(err, "template parsing error")
}
err = tmpl.Execute(os.Stdout, params)
if err != nil {
return err
}
println()
return nil
}
func outputStatsAsJSON(stats []*libkpod.ContainerStats) error {
s, err := json.Marshal(stats)
if err != nil {
return err
}
println(s)
return nil
}
func isRunning(ctr *oci.Container) bool {
return ctr.State().Status == "running"
}
func ctrInList(idsOrNames []string) func(ctr *oci.Container) bool {
if len(idsOrNames) == 0 {
return func(*oci.Container) bool { return true }
}
return func(ctr *oci.Container) bool {
for _, idOrName := range idsOrNames {
if strings.HasPrefix(ctr.ID(), idOrName) || strings.HasSuffix(ctr.Name(), idOrName) {
return true
}
}
return false
}
}
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