DockerCLI/command/task/print.go

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package task
import (
"fmt"
"io"
"sort"
"strings"
"text/tabwriter"
"time"
"golang.org/x/net/context"
"github.com/docker/docker/api/types/swarm"
"github.com/docker/docker/cli/command"
"github.com/docker/docker/cli/command/idresolver"
"github.com/docker/go-units"
)
const (
psTaskItemFmt = "%s\t%s\t%s\t%s\t%s %s ago\t%s\n"
maxErrLength = 30
)
type tasksBySlot []swarm.Task
func (t tasksBySlot) Len() int {
return len(t)
}
func (t tasksBySlot) Swap(i, j int) {
t[i], t[j] = t[j], t[i]
}
func (t tasksBySlot) Less(i, j int) bool {
// Sort by slot.
if t[i].Slot != t[j].Slot {
return t[i].Slot < t[j].Slot
}
// If same slot, sort by most recent.
return t[j].Meta.CreatedAt.Before(t[i].CreatedAt)
}
// Print task information in a table format.
// Besides this, command `docker node ps <node>`
// and `docker stack ps` will call this, too.
func Print(dockerCli *command.DockerCli, ctx context.Context, tasks []swarm.Task, resolver *idresolver.IDResolver, noTrunc bool) error {
sort.Stable(tasksBySlot(tasks))
writer := tabwriter.NewWriter(dockerCli.Out(), 0, 4, 2, ' ', 0)
// Ignore flushing errors
defer writer.Flush()
fmt.Fprintln(writer, strings.Join([]string{"NAME", "IMAGE", "NODE", "DESIRED STATE", "CURRENT STATE", "ERROR"}, "\t"))
if err := print(writer, ctx, tasks, resolver, noTrunc); err != nil {
return err
}
return nil
}
// PrintQuiet shows task list in a quiet way.
func PrintQuiet(dockerCli *command.DockerCli, tasks []swarm.Task) error {
sort.Stable(tasksBySlot(tasks))
out := dockerCli.Out()
for _, task := range tasks {
fmt.Fprintln(out, task.ID)
}
return nil
}
func print(out io.Writer, ctx context.Context, tasks []swarm.Task, resolver *idresolver.IDResolver, noTrunc bool) error {
prevServiceName := ""
prevSlot := 0
for _, task := range tasks {
serviceName, err := resolver.Resolve(ctx, swarm.Service{}, task.ServiceID)
if err != nil {
return err
}
nodeValue, err := resolver.Resolve(ctx, swarm.Node{}, task.NodeID)
if err != nil {
return err
}
name := task.Annotations.Name
// TODO: This is the fallback <ServiceName>.<Slot>.<taskID> in case task name is not present in
// Annotations (upgraded from 1.12).
// We may be able to remove the following in the future.
if name == "" {
if task.Slot != 0 {
name = fmt.Sprintf("%v.%v.%v", serviceName, task.Slot, task.ID)
} else {
name = fmt.Sprintf("%v.%v.%v", serviceName, task.NodeID, task.ID)
}
}
// Indent the name if necessary
indentedName := name
// Since the new format of the task name is <ServiceName>.<Slot>.<taskID>, we should only compare
// <ServiceName> and <Slot> here.
if prevServiceName == serviceName && prevSlot == task.Slot {
indentedName = fmt.Sprintf(" \\_ %s", indentedName)
}
prevServiceName = serviceName
prevSlot = task.Slot
// Trim and quote the error message.
taskErr := task.Status.Err
if !noTrunc && len(taskErr) > maxErrLength {
taskErr = fmt.Sprintf("%s…", taskErr[:maxErrLength-1])
}
if len(taskErr) > 0 {
taskErr = fmt.Sprintf("\"%s\"", taskErr)
}
fmt.Fprintf(
out,
psTaskItemFmt,
indentedName,
task.Spec.ContainerSpec.Image,
nodeValue,
command.PrettyPrint(task.DesiredState),
command.PrettyPrint(task.Status.State),
strings.ToLower(units.HumanDuration(time.Since(task.Status.Timestamp))),
taskErr,
)
}
return nil
}