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service logs: Improve formatting 

- Align output. Previously, output would end up unaligned because of
longer task names (e.g. web.1 vs web.10)
- Truncate task IDs and add a --no-trunc option
- Added a --no-ids option to remove IDs altogether
- Got rid of the generic ID Resolver as we need more customization.

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
This commit is contained in:
Andrea Luzzardi 2016-12-06 18:57:22 -08:00 committed by Drew Erny
parent 889f0259c2
commit 1d379b9691
2 changed files with 107 additions and 45 deletions
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22
command/idresolver/idresolver.go
View File

@ -7,7 +7,6 @@ import (
"github.com/docker/docker/api/types/swarm"
"github.com/docker/docker/client"
"github.com/docker/docker/pkg/stringid"
)
// IDResolver provides ID to Name resolution.
@ -27,7 +26,7 @@ func New(client client.APIClient, noResolve bool) *IDResolver {
}
func (r *IDResolver) get(ctx context.Context, t interface{}, id string) (string, error) {
switch t := t.(type) {
switch t.(type) {
case swarm.Node:
node, _, err := r.client.NodeInspectWithRaw(ctx, id)
if err != nil {
@ -46,25 +45,6 @@ func (r *IDResolver) get(ctx context.Context, t interface{}, id string) (string,
return id, nil
}
return service.Spec.Annotations.Name, nil
case swarm.Task:
// If the caller passes the full task there's no need to do a lookup.
if t.ID == "" {
var err error
t, _, err = r.client.TaskInspectWithRaw(ctx, id)
if err != nil {
return id, nil
}
}
taskID := stringid.TruncateID(t.ID)
if t.ServiceID == "" {
return taskID, nil
}
service, err := r.Resolve(ctx, swarm.Service{}, t.ServiceID)
if err != nil {
return "", err
}
return fmt.Sprintf("%s.%d.%s", service, t.Slot, taskID), nil
default:
return "", fmt.Errorf("unsupported type")
}

130
command/service/logs.go
View File

@ -4,6 +4,7 @@ import (
"bytes"
"fmt"
"io"
"strconv"
"strings"
"golang.org/x/net/context"
@ -13,12 +14,16 @@ import (
"github.com/docker/docker/cli"
"github.com/docker/docker/cli/command"
"github.com/docker/docker/cli/command/idresolver"
"github.com/docker/docker/client"
"github.com/docker/docker/pkg/stdcopy"
"github.com/docker/docker/pkg/stringid"
"github.com/spf13/cobra"
)
type logsOptions struct {
noResolve bool
noTrunc bool
noIDs bool
follow bool
since string
timestamps bool
@ -44,6 +49,8 @@ func newLogsCommand(dockerCli *command.DockerCli) *cobra.Command {
flags := cmd.Flags()
flags.BoolVar(&opts.noResolve, "no-resolve", false, "Do not map IDs to Names")
flags.BoolVar(&opts.noTrunc, "no-trunc", false, "Do not truncate output")
flags.BoolVar(&opts.noIDs, "no-ids", false, "Do not include task IDs")
flags.BoolVarP(&opts.follow, "follow", "f", false, "Follow log output")
flags.StringVar(&opts.since, "since", "", "Show logs since timestamp")
flags.BoolVarP(&opts.timestamps, "timestamps", "t", false, "Show timestamps")
@ -66,26 +73,91 @@ func runLogs(dockerCli *command.DockerCli, opts *logsOptions) error {
}
client := dockerCli.Client()
service, _, err := client.ServiceInspectWithRaw(ctx, opts.service)
if err != nil {
return err
}
responseBody, err := client.ServiceLogs(ctx, opts.service, options)
if err != nil {
return err
}
defer responseBody.Close()
resolver := idresolver.New(client, opts.noResolve)
var replicas uint64
if service.Spec.Mode.Replicated != nil && service.Spec.Mode.Replicated.Replicas != nil {
replicas = *service.Spec.Mode.Replicated.Replicas
}
padding := len(strconv.FormatUint(replicas, 10))
stdout := &logWriter{ctx: ctx, opts: opts, r: resolver, w: dockerCli.Out()}
stderr := &logWriter{ctx: ctx, opts: opts, r: resolver, w: dockerCli.Err()}
taskFormatter := newTaskFormatter(client, opts, padding)
stdout := &logWriter{ctx: ctx, opts: opts, f: taskFormatter, w: dockerCli.Out()}
stderr := &logWriter{ctx: ctx, opts: opts, f: taskFormatter, w: dockerCli.Err()}
// TODO(aluzzardi): Do an io.Copy for services with TTY enabled.
_, err = stdcopy.StdCopy(stdout, stderr, responseBody)
return err
}
type taskFormatter struct {
client client.APIClient
opts *logsOptions
padding int
r *idresolver.IDResolver
cache map[logContext]string
}
func newTaskFormatter(client client.APIClient, opts *logsOptions, padding int) *taskFormatter {
return &taskFormatter{
client: client,
opts: opts,
padding: padding,
r: idresolver.New(client, opts.noResolve),
cache: make(map[logContext]string),
}
}
func (f *taskFormatter) format(ctx context.Context, logCtx logContext) (string, error) {
if cached, ok := f.cache[logCtx]; ok {
return cached, nil
}
nodeName, err := f.r.Resolve(ctx, swarm.Node{}, logCtx.nodeID)
if err != nil {
return "", err
}
serviceName, err := f.r.Resolve(ctx, swarm.Service{}, logCtx.serviceID)
if err != nil {
return "", err
}
task, _, err := f.client.TaskInspectWithRaw(ctx, logCtx.taskID)
if err != nil {
return "", err
}
taskName := fmt.Sprintf("%s.%d", serviceName, task.Slot)
if !f.opts.noIDs {
if f.opts.noTrunc {
taskName += fmt.Sprintf(".%s", task.ID)
} else {
taskName += fmt.Sprintf(".%s", stringid.TruncateID(task.ID))
}
}
padding := strings.Repeat(" ", f.padding-len(strconv.FormatInt(int64(task.Slot), 10)))
formatted := fmt.Sprintf("%s@%s%s", taskName, nodeName, padding)
f.cache[logCtx] = formatted
return formatted, nil
}
type logWriter struct {
ctx context.Context
opts *logsOptions
r *idresolver.IDResolver
f *taskFormatter
w io.Writer
}
@ -102,7 +174,7 @@ func (lw *logWriter) Write(buf []byte) (int, error) {
return 0, fmt.Errorf("invalid context in log message: %v", string(buf))
}
taskName, nodeName, err := lw.parseContext(string(parts[contextIndex]))
logCtx, err := lw.parseContext(string(parts[contextIndex]))
if err != nil {
return 0, err
}
@ -115,8 +187,11 @@ func (lw *logWriter) Write(buf []byte) (int, error) {
}
if i == contextIndex {
// TODO(aluzzardi): Consider constant padding.
output = append(output, []byte(fmt.Sprintf("%s@%s |", taskName, nodeName))...)
formatted, err := lw.f.format(lw.ctx, logCtx)
if err != nil {
return 0, err
}
output = append(output, []byte(fmt.Sprintf("%s |", formatted))...)
} else {
output = append(output, part...)
}
@ -129,35 +204,42 @@ func (lw *logWriter) Write(buf []byte) (int, error) {
return len(buf), nil
}
func (lw *logWriter) parseContext(input string) (string, string, error) {
func (lw *logWriter) parseContext(input string) (logContext, error) {
context := make(map[string]string)
components := strings.Split(input, ",")
for _, component := range components {
parts := strings.SplitN(component, "=", 2)
if len(parts) != 2 {
return "", "", fmt.Errorf("invalid context: %s", input)
return logContext{}, fmt.Errorf("invalid context: %s", input)
}
context[parts[0]] = parts[1]
}
taskID, ok := context["com.docker.swarm.task.id"]
if !ok {
return "", "", fmt.Errorf("missing task id in context: %s", input)
}
taskName, err := lw.r.Resolve(lw.ctx, swarm.Task{}, taskID)
if err != nil {
return "", "", err
}
nodeID, ok := context["com.docker.swarm.node.id"]
if !ok {
return "", "", fmt.Errorf("missing node id in context: %s", input)
}
nodeName, err := lw.r.Resolve(lw.ctx, swarm.Node{}, nodeID)
if err != nil {
return "", "", err
return logContext{}, fmt.Errorf("missing node id in context: %s", input)
}
return taskName, nodeName, nil
serviceID, ok := context["com.docker.swarm.service.id"]
if !ok {
return logContext{}, fmt.Errorf("missing service id in context: %s", input)
}
taskID, ok := context["com.docker.swarm.task.id"]
if !ok {
return logContext{}, fmt.Errorf("missing task id in context: %s", input)
}
return logContext{
nodeID: nodeID,
serviceID: serviceID,
taskID: taskID,
}, nil
}
type logContext struct {
nodeID string
serviceID string
taskID string
}