package container import ( "fmt" "strings" "text/tabwriter" "github.com/docker/cli/cli" "github.com/docker/cli/cli/command" "github.com/spf13/cobra" "golang.org/x/net/context" ) type topOptions struct { container string args []string } // NewTopCommand creates a new cobra.Command for `docker top` func NewTopCommand(dockerCli command.Cli) *cobra.Command { var opts topOptions cmd := &cobra.Command{ Use: "top CONTAINER [ps OPTIONS]", Short: "Display the running processes of a container", Args: cli.RequiresMinArgs(1), RunE: func(cmd *cobra.Command, args []string) error { opts.container = args[0] opts.args = args[1:] return runTop(dockerCli, &opts) }, } flags := cmd.Flags() flags.SetInterspersed(false) return cmd } func runTop(dockerCli command.Cli, opts *topOptions) error { ctx := context.Background() procList, err := dockerCli.Client().ContainerTop(ctx, opts.container, opts.args) if err != nil { return err } w := tabwriter.NewWriter(dockerCli.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 }