package node import ( "fmt" "io" "text/tabwriter" "golang.org/x/net/context" "github.com/docker/docker/api/types" "github.com/docker/docker/api/types/swarm" "github.com/docker/docker/cli" "github.com/docker/docker/cli/command" "github.com/docker/docker/opts" "github.com/spf13/cobra" ) const ( listItemFmt = "%s\t%s\t%s\t%s\t%s\n" ) type listOptions struct { quiet bool filter opts.FilterOpt } func newListCommand(dockerCli command.Cli) *cobra.Command { opts := listOptions{filter: opts.NewFilterOpt()} cmd := &cobra.Command{ Use: "ls [OPTIONS]", Aliases: []string{"list"}, Short: "List nodes in the swarm", Args: cli.NoArgs, RunE: func(cmd *cobra.Command, args []string) error { return runList(dockerCli, opts) }, } flags := cmd.Flags() flags.BoolVarP(&opts.quiet, "quiet", "q", false, "Only display IDs") flags.VarP(&opts.filter, "filter", "f", "Filter output based on conditions provided") return cmd } func runList(dockerCli command.Cli, opts listOptions) error { client := dockerCli.Client() out := dockerCli.Out() ctx := context.Background() nodes, err := client.NodeList( ctx, types.NodeListOptions{Filters: opts.filter.Value()}) if err != nil { return err } if len(nodes) > 0 && !opts.quiet { // only non-empty nodes and not quiet, should we call /info api info, err := client.Info(ctx) if err != nil { return err } printTable(out, nodes, info) } else if !opts.quiet { // no nodes and not quiet, print only one line with columns ID, HOSTNAME, ... printTable(out, nodes, types.Info{}) } else { printQuiet(out, nodes) } return nil } func printTable(out io.Writer, nodes []swarm.Node, info types.Info) { writer := tabwriter.NewWriter(out, 0, 4, 2, ' ', 0) // Ignore flushing errors defer writer.Flush() fmt.Fprintf(writer, listItemFmt, "ID", "HOSTNAME", "STATUS", "AVAILABILITY", "MANAGER STATUS") for _, node := range nodes { name := node.Description.Hostname availability := string(node.Spec.Availability) reachability := "" if node.ManagerStatus != nil { if node.ManagerStatus.Leader { reachability = "Leader" } else { reachability = string(node.ManagerStatus.Reachability) } } ID := node.ID if node.ID == info.Swarm.NodeID { ID = ID + " *" } fmt.Fprintf( writer, listItemFmt, ID, name, command.PrettyPrint(string(node.Status.State)), command.PrettyPrint(availability), command.PrettyPrint(reachability)) } } func printQuiet(out io.Writer, nodes []swarm.Node) { for _, node := range nodes { fmt.Fprintln(out, node.ID) } }