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