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moby--moby/cli/command/service/list.go

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package service
import (
"fmt"
"io"
"strings"
"text/tabwriter"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/filters"
"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/docker/docker/pkg/stringid"
"github.com/spf13/cobra"
"golang.org/x/net/context"
)
const (
listItemFmt = "%s\t%s\t%s\t%s\t%s\n"
)
type listOptions struct {
quiet bool
filter opts.FilterOpt
}
func newListCommand(dockerCli *command.DockerCli) *cobra.Command {
opts := listOptions{filter: opts.NewFilterOpt()}
cmd := &cobra.Command{
Use: "ls [OPTIONS]",
Aliases: []string{"list"},
Short: "List services",
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.DockerCli, opts listOptions) error {
ctx := context.Background()
client := dockerCli.Client()
out := dockerCli.Out()
services, err := client.ServiceList(ctx, types.ServiceListOptions{Filter: opts.filter.Value()})
if err != nil {
return err
}
if len(services) > 0 && !opts.quiet {
// only non-empty services and not quiet, should we call TaskList and NodeList api
taskFilter := filters.NewArgs()
for _, service := range services {
taskFilter.Add("service", service.ID)
}
tasks, err := client.TaskList(ctx, types.TaskListOptions{Filter: taskFilter})
if err != nil {
return err
}
nodes, err := client.NodeList(ctx, types.NodeListOptions{})
if err != nil {
return err
}
PrintNotQuiet(out, services, nodes, tasks)
} else if !opts.quiet {
// no services and not quiet, print only one line with columns ID, NAME, REPLICAS...
PrintNotQuiet(out, services, []swarm.Node{}, []swarm.Task{})
} else {
PrintQuiet(out, services)
}
return nil
}
// PrintNotQuiet shows service list in a non-quiet way.
// Besides this, command `docker stack services xxx` will call this, too.
func PrintNotQuiet(out io.Writer, services []swarm.Service, nodes []swarm.Node, tasks []swarm.Task) {
activeNodes := make(map[string]struct{})
for _, n := range nodes {
if n.Status.State != swarm.NodeStateDown {
activeNodes[n.ID] = struct{}{}
}
}
running := map[string]int{}
for _, task := range tasks {
if _, nodeActive := activeNodes[task.NodeID]; nodeActive && task.Status.State == "running" {
running[task.ServiceID]++
}
}
printTable(out, services, running)
}
func printTable(out io.Writer, services []swarm.Service, running map[string]int) {
writer := tabwriter.NewWriter(out, 0, 4, 2, ' ', 0)
// Ignore flushing errors
defer writer.Flush()
fmt.Fprintf(writer, listItemFmt, "ID", "NAME", "REPLICAS", "IMAGE", "COMMAND")
for _, service := range services {
replicas := ""
if service.Spec.Mode.Replicated != nil && service.Spec.Mode.Replicated.Replicas != nil {
replicas = fmt.Sprintf("%d/%d", running[service.ID], *service.Spec.Mode.Replicated.Replicas)
} else if service.Spec.Mode.Global != nil {
replicas = "global"
}
fmt.Fprintf(
writer,
listItemFmt,
stringid.TruncateID(service.ID),
service.Spec.Name,
replicas,
service.Spec.TaskTemplate.ContainerSpec.Image,
strings.Join(service.Spec.TaskTemplate.ContainerSpec.Args, " "))
}
}
// PrintQuiet shows service list in a quiet way.
// Besides this, command `docker stack services xxx` will call this, too.
func PrintQuiet(out io.Writer, services []swarm.Service) {
for _, service := range services {
fmt.Fprintln(out, service.ID)
}
}