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package pods
import (
"context"
"fmt"
"os"
"reflect"
"strings"
"text/tabwriter"
"text/template"
"time"
"github.com/buger/goterm"
"github.com/containers/buildah/pkg/formats"
"github.com/containers/libpod/cmd/podman/registry"
"github.com/containers/libpod/pkg/domain/entities"
"github.com/containers/libpod/pkg/util/camelcase"
"github.com/spf13/cobra"
)
type podStatsOptionsWrapper struct {
entities.PodStatsOptions
// Format - pretty-print to JSON or a go template.
Format string
// NoReset - do not reset the screen when streaming.
NoReset bool
// NoStream - do not stream stats but write them once.
NoStream bool
}
var (
statsOptions = podStatsOptionsWrapper{}
statsDescription = `Display the containers' resource-usage statistics of one or more running pod`
// Command: podman pod _pod_
statsCmd = &cobra.Command{
Use: "stats [flags] [POD...]",
Short: "Display a live stream of resource usage statistics for the containers in one or more pods",
Long: statsDescription,
RunE: stats,
Example: `podman pod stats
podman pod stats a69b23034235 named-pod
podman pod stats --latest
podman pod stats --all`,
}
)
func init() {
registry.Commands = append(registry.Commands, registry.CliCommand{
Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
Command: statsCmd,
Parent: podCmd,
})
flags := statsCmd.Flags()
flags.BoolVarP(&statsOptions.All, "all", "a", false, "Provide stats for all pods")
flags.StringVar(&statsOptions.Format, "format", "", "Pretty-print container statistics to JSON or using a Go template")
flags.BoolVarP(&statsOptions.Latest, "latest", "l", false, "Provide stats on the latest pod Podman is aware of")
flags.BoolVar(&statsOptions.NoReset, "no-reset", false, "Disable resetting the screen when streaming")
flags.BoolVar(&statsOptions.NoStream, "no-stream", false, "Disable streaming stats and only pull the first result")
if registry.IsRemote() {
_ = flags.MarkHidden("latest")
}
}
func stats(cmd *cobra.Command, args []string) error {
// Validate input.
if err := entities.ValidatePodStatsOptions(args, &statsOptions.PodStatsOptions); err != nil {
return err
}
format := statsOptions.Format
doJSON := strings.ToLower(format) == formats.JSONString
header := getPodStatsHeader(format)
for {
reports, err := registry.ContainerEngine().PodStats(context.Background(), args, statsOptions.PodStatsOptions)
if err != nil {
return err
}
// Print the stats in the requested format and configuration.
if doJSON {
if err := printJSONPodStats(reports); err != nil {
return err
}
} else {
if !statsOptions.NoReset {
goterm.Clear()
goterm.MoveCursor(1, 1)
goterm.Flush()
}
if len(format) == 0 {
printPodStatsLines(reports)
} else if err := printFormattedPodStatsLines(format, reports, header); err != nil {
return err
}
}
if statsOptions.NoStream {
break
}
time.Sleep(time.Second)
}
return nil
}
func printJSONPodStats(stats []*entities.PodStatsReport) error {
b, err := json.MarshalIndent(&stats, "", " ")
if err != nil {
return err
}
fmt.Fprintf(os.Stdout, "%s\n", string(b))
return nil
}
func printPodStatsLines(stats []*entities.PodStatsReport) {
w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
outFormat := "%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\n"
fmt.Fprintf(w, outFormat, "POD", "CID", "NAME", "CPU %", "MEM USAGE/ LIMIT", "MEM %", "NET IO", "BLOCK IO", "PIDS")
for _, i := range stats {
if len(stats) == 0 {
fmt.Fprintf(w, outFormat, i.Pod, "--", "--", "--", "--", "--", "--", "--", "--")
} else {
fmt.Fprintf(w, outFormat, i.Pod, i.CID, i.Name, i.CPU, i.MemUsage, i.Mem, i.NetIO, i.BlockIO, i.PIDS)
}
}
w.Flush()
}
func printFormattedPodStatsLines(format string, stats []*entities.PodStatsReport, headerNames map[string]string) error {
if len(stats) == 0 {
return nil
}
// Use a tabwriter to align column format
w := tabwriter.NewWriter(os.Stdout, 0, 0, 3, ' ', 0)
// Spit out the header if "table" is present in the format
if strings.HasPrefix(format, "table") {
hformat := strings.Replace(strings.TrimSpace(format[5:]), " ", "\t", -1)
format = hformat
headerTmpl, err := template.New("header").Parse(hformat)
if err != nil {
return err
}
if err := headerTmpl.Execute(w, headerNames); err != nil {
return err
}
fmt.Fprintln(w, "")
}
// Spit out the data rows now
dataTmpl, err := template.New("data").Parse(format)
if err != nil {
return err
}
for _, s := range stats {
if err := dataTmpl.Execute(w, s); err != nil {
return err
}
fmt.Fprintln(w, "")
}
// Flush the writer
return w.Flush()
}
// getPodStatsHeader returns the stats header for the specified options.
func getPodStatsHeader(format string) map[string]string {
headerNames := make(map[string]string)
if format == "" {
return headerNames
}
// Make a map of the field names for the headers
v := reflect.ValueOf(entities.PodStatsReport{})
t := v.Type()
for i := 0; i < t.NumField(); i++ {
split := camelcase.Split(t.Field(i).Name)
value := strings.ToUpper(strings.Join(split, " "))
switch value {
case "CPU", "MEM":
value += " %"
case "MEM USAGE":
value = "MEM USAGE / LIMIT"
}
headerNames[t.Field(i).Name] = value
}
return headerNames
}
|
