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package main
import (
"encoding/json"
"fmt"
"strings"
"github.com/pkg/errors"
"github.com/projectatomic/libpod/cmd/kpod/formats"
"github.com/projectatomic/libpod/libpod"
"github.com/urfave/cli"
)
var (
topFlags = []cli.Flag{
cli.StringFlag{
Name: "format",
Usage: "Change the output to JSON",
},
}
topDescription = `
kpod top
Display the running processes of the container.
`
topCommand = cli.Command{
Name: "top",
Usage: "Display the running processes of a container",
Description: topDescription,
Flags: topFlags,
Action: topCmd,
ArgsUsage: "CONTAINER-NAME",
SkipArgReorder: true,
}
)
func topCmd(c *cli.Context) error {
doJSON := false
if c.IsSet("format") {
if strings.ToUpper(c.String("format")) == "JSON" {
doJSON = true
} else {
return errors.Errorf("only 'json' is supported for a format option")
}
}
args := c.Args()
var psArgs []string
psOpts := []string{"-o", "uid,pid,ppid,c,stime,tname,time,cmd"}
if len(args) < 1 {
return errors.Errorf("you must provide the name or id of a running container")
}
if err := validateFlags(c, topFlags); err != nil {
return err
}
runtime, err := getRuntime(c)
if err != nil {
return errors.Wrapf(err, "error creating libpod runtime")
}
defer runtime.Shutdown(false)
if len(args) > 1 {
psOpts = args[1:]
}
container, err := runtime.LookupContainer(args[0])
if err != nil {
return errors.Wrapf(err, "unable to lookup %s", args[0])
}
conStat, err := container.State()
if err != nil {
return errors.Wrapf(err, "unable to look up state for %s", args[0])
}
if conStat != libpod.ContainerStateRunning {
return errors.Errorf("top can only be used on running containers")
}
psArgs = append(psArgs, psOpts...)
results, err := container.GetContainerPidInformation(psArgs)
if err != nil {
return err
}
headers := getHeaders(results[0])
format := genTopFormat(headers)
var out formats.Writer
psParams, err := psDataToPSParams(results[1:], headers)
if err != nil {
return errors.Wrap(err, "unable to convert ps data to proper structure")
}
if doJSON {
out = formats.JSONStructArray{Output: topToGeneric(psParams)}
} else {
out = formats.StdoutTemplateArray{Output: topToGeneric(psParams), Template: format, Fields: createTopHeaderMap(headers)}
}
formats.Writer(out).Out()
return nil
}
func getHeaders(s string) []string {
var headers []string
tmpHeaders := strings.Fields(s)
for _, header := range tmpHeaders {
headers = append(headers, strings.Replace(header, "%", "", -1))
}
return headers
}
func genTopFormat(headers []string) string {
format := "table "
for _, header := range headers {
format = fmt.Sprintf("%s{{.%s}}\t", format, header)
}
return format
}
// imagesToGeneric creates an empty array of interfaces for output
func topToGeneric(templParams []PSParams) (genericParams []interface{}) {
for _, v := range templParams {
genericParams = append(genericParams, interface{}(v))
}
return
}
// generate the header based on the template provided
func createTopHeaderMap(v []string) map[string]string {
values := make(map[string]string)
for _, key := range v {
value := key
if value == "CPU" {
value = "%CPU"
} else if value == "MEM" {
value = "%MEM"
}
values[key] = strings.ToUpper(splitCamelCase(value))
}
return values
}
// PSDataToParams converts a string array of data and its headers to an
// arra if PSParams
func psDataToPSParams(data []string, headers []string) ([]PSParams, error) {
var params []PSParams
for _, line := range data {
tmpMap := make(map[string]string)
tmpArray := strings.Fields(line)
if len(tmpArray) == 0 {
continue
}
for index, v := range tmpArray {
header := headers[index]
tmpMap[header] = v
}
jsonData, _ := json.Marshal(tmpMap)
var r PSParams
err := json.Unmarshal(jsonData, &r)
if err != nil {
return []PSParams{}, err
}
params = append(params, r)
}
return params, nil
}
//PSParams is a list of options that the command line ps recognizes
type PSParams struct {
CPU string `json: "%CPU"`
MEM string `json: "%MEM"`
COMMAND string
BLOCKED string
START string
TIME string
C string
CAUGHT string
CGROUP string
CLSCLS string
CLS string
CMD string
CP string
DRS string
EGID string
EGROUP string
EIP string
ESP string
ELAPSED string
EUIDE string
USER string
F string
FGID string
FGROUP string
FUID string
FUSER string
GID string
GROUP string
IGNORED string
IPCNS string
LABEL string
STARTED string
SESSION string
LWP string
MACHINE string
MAJFLT string
MINFLT string
MNTNS string
NETNS string
NI string
NLWP string
OWNER string
PENDING string
PGID string
PGRP string
PID string
PIDNS string
POL string
PPID string
PRI string
PSR string
RGID string
RGROUP string
RSS string
RSZ string
RTPRIO string
RUID string
RUSER string
S string
SCH string
SEAT string
SESS string
P string
SGID string
SGROUP string
SID string
SIZE string
SLICE string
SPID string
STACKP string
STIME string
SUID string
SUPGID string
SUPGRP string
SUSER string
SVGID string
SZ string
TGID string
THCNT string
TID string
TTY string
TPGID string
TRS string
TT string
UID string
UNIT string
USERNS string
UTSNS string
UUNIT string
VSZ string
WCHAN string
}
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