| package daemon |
| |
| import ( |
| "fmt" |
| "io" |
| "time" |
| |
| "github.com/Sirupsen/logrus" |
| "github.com/docker/docker/api/errors" |
| "github.com/docker/docker/api/types/backend" |
| "github.com/docker/docker/container" |
| "github.com/docker/docker/daemon/logger" |
| "github.com/docker/docker/pkg/stdcopy" |
| "github.com/docker/docker/pkg/term" |
| ) |
| |
| // ContainerAttach attaches to logs according to the config passed in. See ContainerAttachConfig. |
| func (daemon *Daemon) ContainerAttach(prefixOrName string, c *backend.ContainerAttachConfig) error { |
| keys := []byte{} |
| var err error |
| if c.DetachKeys != "" { |
| keys, err = term.ToBytes(c.DetachKeys) |
| if err != nil { |
| return fmt.Errorf("Invalid escape keys (%s) provided", c.DetachKeys) |
| } |
| } |
| |
| container, err := daemon.GetContainer(prefixOrName) |
| if err != nil { |
| return err |
| } |
| if container.IsPaused() { |
| err := fmt.Errorf("Container %s is paused. Unpause the container before attach", prefixOrName) |
| return errors.NewRequestConflictError(err) |
| } |
| |
| inStream, outStream, errStream, err := c.GetStreams() |
| if err != nil { |
| return err |
| } |
| defer inStream.Close() |
| |
| if !container.Config.Tty && c.MuxStreams { |
| errStream = stdcopy.NewStdWriter(errStream, stdcopy.Stderr) |
| outStream = stdcopy.NewStdWriter(outStream, stdcopy.Stdout) |
| } |
| |
| var stdin io.ReadCloser |
| var stdout, stderr io.Writer |
| |
| if c.UseStdin { |
| stdin = inStream |
| } |
| if c.UseStdout { |
| stdout = outStream |
| } |
| if c.UseStderr { |
| stderr = errStream |
| } |
| |
| if err := daemon.containerAttach(container, stdin, stdout, stderr, c.Logs, c.Stream, keys); err != nil { |
| fmt.Fprintf(outStream, "Error attaching: %s\n", err) |
| } |
| return nil |
| } |
| |
| // ContainerAttachRaw attaches the provided streams to the container's stdio |
| func (daemon *Daemon) ContainerAttachRaw(prefixOrName string, stdin io.ReadCloser, stdout, stderr io.Writer, stream bool) error { |
| container, err := daemon.GetContainer(prefixOrName) |
| if err != nil { |
| return err |
| } |
| return daemon.containerAttach(container, stdin, stdout, stderr, false, stream, nil) |
| } |
| |
| func (daemon *Daemon) containerAttach(c *container.Container, stdin io.ReadCloser, stdout, stderr io.Writer, logs, stream bool, keys []byte) error { |
| if logs { |
| logDriver, err := daemon.getLogger(c) |
| if err != nil { |
| return err |
| } |
| cLog, ok := logDriver.(logger.LogReader) |
| if !ok { |
| return logger.ErrReadLogsNotSupported |
| } |
| logs := cLog.ReadLogs(logger.ReadConfig{Tail: -1}) |
| |
| LogLoop: |
| for { |
| select { |
| case msg, ok := <-logs.Msg: |
| if !ok { |
| break LogLoop |
| } |
| if msg.Source == "stdout" && stdout != nil { |
| stdout.Write(msg.Line) |
| } |
| if msg.Source == "stderr" && stderr != nil { |
| stderr.Write(msg.Line) |
| } |
| case err := <-logs.Err: |
| logrus.Errorf("Error streaming logs: %v", err) |
| break LogLoop |
| } |
| } |
| } |
| |
| daemon.LogContainerEvent(c, "attach") |
| |
| //stream |
| if stream { |
| var stdinPipe io.ReadCloser |
| if stdin != nil { |
| r, w := io.Pipe() |
| go func() { |
| defer w.Close() |
| defer logrus.Debug("Closing buffered stdin pipe") |
| io.Copy(w, stdin) |
| }() |
| stdinPipe = r |
| } |
| |
| waitChan := make(chan struct{}) |
| if c.Config.StdinOnce && !c.Config.Tty { |
| go func() { |
| c.WaitStop(-1 * time.Second) |
| close(waitChan) |
| }() |
| } |
| |
| err := <-c.Attach(stdinPipe, stdout, stderr, keys) |
| if err != nil { |
| if _, ok := err.(container.DetachError); ok { |
| daemon.LogContainerEvent(c, "detach") |
| } else { |
| logrus.Errorf("attach failed with error: %v", err) |
| } |
| } |
| |
| // If we are in stdinonce mode, wait for the process to end |
| // otherwise, simply return |
| if c.Config.StdinOnce && !c.Config.Tty { |
| <-waitChan |
| } |
| } |
| return nil |
| } |