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moby--moby/daemon/logs.go
Antonio Murdaca 91bfed6049 Remove job from logs
Signed-off-by: Antonio Murdaca <me@runcom.ninja>
2015-04-13 08:25:31 +02:00

162 lines
3.7 KiB
Go

package daemon
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"strconv"
"sync"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/jsonlog"
"github.com/docker/docker/pkg/stdcopy"
"github.com/docker/docker/pkg/tailfile"
"github.com/docker/docker/pkg/timeutils"
)
type ContainerLogsConfig struct {
Follow, Timestamps bool
Tail string
UseStdout, UseStderr bool
OutStream io.Writer
}
func (daemon *Daemon) ContainerLogs(name string, config *ContainerLogsConfig) error {
var (
lines = -1
format string
)
if !(config.UseStdout || config.UseStderr) {
return fmt.Errorf("You must choose at least one stream")
}
if config.Timestamps {
format = timeutils.RFC3339NanoFixed
}
if config.Tail == "" {
config.Tail = "all"
}
container, err := daemon.Get(name)
if err != nil {
return err
}
var (
outStream = config.OutStream
errStream io.Writer
)
if !container.Config.Tty {
errStream = stdcopy.NewStdWriter(outStream, stdcopy.Stderr)
outStream = stdcopy.NewStdWriter(outStream, stdcopy.Stdout)
} else {
errStream = outStream
}
if container.LogDriverType() != "json-file" {
return fmt.Errorf("\"logs\" endpoint is supported only for \"json-file\" logging driver")
}
cLog, err := container.ReadLog("json")
if err != nil && os.IsNotExist(err) {
// Legacy logs
logrus.Debugf("Old logs format")
if config.UseStdout {
cLog, err := container.ReadLog("stdout")
if err != nil {
logrus.Errorf("Error reading logs (stdout): %s", err)
} else if _, err := io.Copy(outStream, cLog); err != nil {
logrus.Errorf("Error streaming logs (stdout): %s", err)
}
}
if config.UseStderr {
cLog, err := container.ReadLog("stderr")
if err != nil {
logrus.Errorf("Error reading logs (stderr): %s", err)
} else if _, err := io.Copy(errStream, cLog); err != nil {
logrus.Errorf("Error streaming logs (stderr): %s", err)
}
}
} else if err != nil {
logrus.Errorf("Error reading logs (json): %s", err)
} else {
if config.Tail != "all" {
var err error
lines, err = strconv.Atoi(config.Tail)
if err != nil {
logrus.Errorf("Failed to parse tail %s, error: %v, show all logs", config.Tail, err)
lines = -1
}
}
if lines != 0 {
if lines > 0 {
f := cLog.(*os.File)
ls, err := tailfile.TailFile(f, lines)
if err != nil {
return err
}
tmp := bytes.NewBuffer([]byte{})
for _, l := range ls {
fmt.Fprintf(tmp, "%s\n", l)
}
cLog = tmp
}
dec := json.NewDecoder(cLog)
l := &jsonlog.JSONLog{}
for {
if err := dec.Decode(l); err == io.EOF {
break
} else if err != nil {
logrus.Errorf("Error streaming logs: %s", err)
break
}
logLine := l.Log
if config.Timestamps {
// format can be "" or time format, so here can't be error
logLine, _ = l.Format(format)
}
if l.Stream == "stdout" && config.UseStdout {
io.WriteString(outStream, logLine)
}
if l.Stream == "stderr" && config.UseStderr {
io.WriteString(errStream, logLine)
}
l.Reset()
}
}
}
if config.Follow && container.IsRunning() {
errors := make(chan error, 2)
wg := sync.WaitGroup{}
if config.UseStdout {
wg.Add(1)
stdoutPipe := container.StdoutLogPipe()
defer stdoutPipe.Close()
go func() {
errors <- jsonlog.WriteLog(stdoutPipe, outStream, format)
wg.Done()
}()
}
if config.UseStderr {
wg.Add(1)
stderrPipe := container.StderrLogPipe()
defer stderrPipe.Close()
go func() {
errors <- jsonlog.WriteLog(stderrPipe, errStream, format)
wg.Done()
}()
}
wg.Wait()
close(errors)
for err := range errors {
if err != nil {
logrus.Errorf("%s", err)
}
}
}
return nil
}