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moby--moby/api/client/top.go

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package client
import (
"encoding/json"
"fmt"
"net/url"
"strings"
"text/tabwriter"
"github.com/docker/docker/api/types"
Cli "github.com/docker/docker/cli"
flag "github.com/docker/docker/pkg/mflag"
)
// CmdTop displays the running processes of a container.
//
// Usage: docker top CONTAINER
func (cli *DockerCli) CmdTop(args ...string) error {
cmd := Cli.Subcmd("top", []string{"CONTAINER [ps OPTIONS]"}, "Display the running processes of a container", true)
cmd.Require(flag.Min, 1)
cmd.ParseFlags(args, true)
val := url.Values{}
if cmd.NArg() > 1 {
val.Set("ps_args", strings.Join(cmd.Args()[1:], " "))
}
serverResp, err := cli.call("GET", "/containers/"+cmd.Arg(0)+"/top?"+val.Encode(), nil, nil)
if err != nil {
return err
}
defer serverResp.body.Close()
procList := types.ContainerProcessList{}
if err := json.NewDecoder(serverResp.body).Decode(&procList); err != nil {
return err
}
w := tabwriter.NewWriter(cli.out, 20, 1, 3, ' ', 0)
fmt.Fprintln(w, strings.Join(procList.Titles, "\t"))
for _, proc := range procList.Processes {
fmt.Fprintln(w, strings.Join(proc, "\t"))
}
w.Flush()
return nil
}