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package pods
import (
"context"
"fmt"
"os"
"text/tabwriter"
"text/template"
"time"
"github.com/buger/goterm"
"github.com/containers/common/pkg/report"
"github.com/containers/podman/v2/cmd/podman/registry"
"github.com/containers/podman/v2/cmd/podman/validate"
"github.com/containers/podman/v2/pkg/domain/entities"
"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.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")
validate.AddLatestFlag(statsCmd, &statsOptions.Latest)
}
func stats(cmd *cobra.Command, args []string) error {
// Validate input.
if err := entities.ValidatePodStatsOptions(args, &statsOptions.PodStatsOptions); err != nil {
return err
}
row := report.NormalizeFormat(statsOptions.Format)
doJSON := report.IsJSON(row)
headers := report.Headers(entities.PodStatsReport{}, map[string]string{
"CPU": "CPU %",
"MemUsage": "MEM USAGE/ LIMIT",
"MEM": "MEM %",
"NET IO": "NET IO",
"BlockIO": "BLOCK IO",
})
for ; ; time.Sleep(time.Second) {
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 cmd.Flags().Changed("format") {
if err := printFormattedPodStatsLines(headers, row, reports); err != nil {
return err
}
} else {
printPodStatsLines(reports)
}
}
if statsOptions.NoStream {
break
}
}
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")
if len(stats) == 0 {
fmt.Fprintf(w, outFormat, "--", "--", "--", "--", "--", "--", "--", "--", "--")
} else {
for _, i := range stats {
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(headerNames []map[string]string, row string, stats []*entities.PodStatsReport) error {
if len(stats) == 0 {
return nil
}
row = "{{range .}}" + row + "{{end}}"
tmpl, err := template.New("pod stats").Parse(row)
if err != nil {
return err
}
w := tabwriter.NewWriter(os.Stdout, 0, 0, 3, ' ', 0)
defer w.Flush()
if err := tmpl.Execute(w, headerNames); err != nil {
return err
}
return tmpl.Execute(w, stats)
}
|
