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moby--moby/daemon/logs.go

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package daemon
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"strconv"
"time"
"github.com/docker/docker/pkg/log"
"github.com/docker/docker/pkg/tailfile"
"github.com/docker/docker/engine"
"github.com/docker/docker/pkg/jsonlog"
)
func (daemon *Daemon) ContainerLogs(job *engine.Job) engine.Status {
if len(job.Args) != 1 {
return job.Errorf("Usage: %s CONTAINER\n", job.Name)
}
var (
name = job.Args[0]
stdout = job.GetenvBool("stdout")
stderr = job.GetenvBool("stderr")
tail = job.Getenv("tail")
follow = job.GetenvBool("follow")
times = job.GetenvBool("timestamps")
lines = -1
format string
)
if !(stdout || stderr) {
return job.Errorf("You must choose at least one stream")
}
if times {
format = time.RFC3339Nano
}
if tail == "" {
tail = "all"
}
container := daemon.Get(name)
if container == nil {
return job.Errorf("No such container: %s", name)
}
cLog, err := container.ReadLog("json")
if err != nil && os.IsNotExist(err) {
// Legacy logs
log.Debugf("Old logs format")
if stdout {
cLog, err := container.ReadLog("stdout")
if err != nil {
log.Errorf("Error reading logs (stdout): %s", err)
} else if _, err := io.Copy(job.Stdout, cLog); err != nil {
log.Errorf("Error streaming logs (stdout): %s", err)
}
}
if stderr {
cLog, err := container.ReadLog("stderr")
if err != nil {
log.Errorf("Error reading logs (stderr): %s", err)
} else if _, err := io.Copy(job.Stderr, cLog); err != nil {
log.Errorf("Error streaming logs (stderr): %s", err)
}
}
} else if err != nil {
log.Errorf("Error reading logs (json): %s", err)
} else {
if tail != "all" {
var err error
lines, err = strconv.Atoi(tail)
if err != nil {
log.Errorf("Failed to parse tail %s, error: %v, show all logs", tail, err)
lines = -1
}
}
if lines != 0 {
if lines > 0 {
f := cLog.(*os.File)
ls, err := tailfile.TailFile(f, lines)
if err != nil {
return job.Error(err)
}
tmp := bytes.NewBuffer([]byte{})
for _, l := range ls {
fmt.Fprintf(tmp, "%s\n", l)
}
cLog = tmp
}
dec := json.NewDecoder(cLog)
for {
l := &jsonlog.JSONLog{}
if err := dec.Decode(l); err == io.EOF {
break
} else if err != nil {
log.Errorf("Error streaming logs: %s", err)
break
}
logLine := l.Log
if times {
logLine = fmt.Sprintf("%s %s", l.Created.Format(format), logLine)
}
if l.Stream == "stdout" && stdout {
fmt.Fprintf(job.Stdout, "%s", logLine)
}
if l.Stream == "stderr" && stderr {
fmt.Fprintf(job.Stderr, "%s", logLine)
}
}
}
}
if follow && container.IsRunning() {
errors := make(chan error, 2)
if stdout {
stdoutPipe := container.StdoutLogPipe()
go func() {
errors <- jsonlog.WriteLog(stdoutPipe, job.Stdout, format)
}()
}
if stderr {
stderrPipe := container.StderrLogPipe()
go func() {
errors <- jsonlog.WriteLog(stderrPipe, job.Stderr, format)
}()
}
err := <-errors
if err != nil {
log.Errorf("%s", err)
}
}
return engine.StatusOK
}