273 lines
6.7 KiB
Go
273 lines
6.7 KiB
Go
package daemon
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import (
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"encoding/json"
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"io"
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"os"
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"time"
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"github.com/docker/docker/engine"
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"github.com/docker/docker/pkg/ioutils"
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"github.com/docker/docker/pkg/jsonlog"
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"github.com/docker/docker/pkg/log"
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"github.com/docker/docker/pkg/promise"
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"github.com/docker/docker/utils"
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)
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func (daemon *Daemon) ContainerAttach(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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logs = job.GetenvBool("logs")
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stream = job.GetenvBool("stream")
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stdin = job.GetenvBool("stdin")
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stdout = job.GetenvBool("stdout")
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stderr = job.GetenvBool("stderr")
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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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//logs
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if logs {
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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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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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if l.Stream == "stdout" && stdout {
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io.WriteString(job.Stdout, l.Log)
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}
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if l.Stream == "stderr" && stderr {
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io.WriteString(job.Stderr, l.Log)
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}
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}
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}
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}
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//stream
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if stream {
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var (
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cStdin io.ReadCloser
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cStdout, cStderr io.Writer
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cStdinCloser io.Closer
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)
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if stdin {
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r, w := io.Pipe()
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go func() {
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defer w.Close()
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defer log.Debugf("Closing buffered stdin pipe")
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io.Copy(w, job.Stdin)
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}()
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cStdin = r
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cStdinCloser = job.Stdin
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}
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if stdout {
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cStdout = job.Stdout
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}
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if stderr {
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cStderr = job.Stderr
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}
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<-daemon.Attach(&container.StreamConfig, container.Config.OpenStdin, container.Config.StdinOnce, container.Config.Tty, cStdin, cStdinCloser, cStdout, cStderr)
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// If we are in stdinonce mode, wait for the process to end
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// otherwise, simply return
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if container.Config.StdinOnce && !container.Config.Tty {
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container.WaitStop(-1 * time.Second)
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}
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}
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return engine.StatusOK
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}
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// FIXME: this should be private, and every outside subsystem
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// should go through the "container_attach" job. But that would require
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// that job to be properly documented, as well as the relationship between
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// Attach and ContainerAttach.
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//
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// This method is in use by builder/builder.go.
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func (daemon *Daemon) Attach(streamConfig *StreamConfig, openStdin, stdinOnce, tty bool, stdin io.ReadCloser, stdinCloser io.Closer, stdout io.Writer, stderr io.Writer) chan error {
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var (
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cStdout, cStderr io.ReadCloser
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nJobs int
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errors = make(chan error, 3)
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)
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// Connect stdin of container to the http conn.
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if stdin != nil && openStdin {
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nJobs++
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// Get the stdin pipe.
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if cStdin, err := streamConfig.StdinPipe(); err != nil {
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errors <- err
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} else {
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go func() {
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log.Debugf("attach: stdin: begin")
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defer log.Debugf("attach: stdin: end")
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// No matter what, when stdin is closed (io.Copy unblock), close stdout and stderr
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if stdinOnce && !tty {
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defer cStdin.Close()
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} else {
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defer func() {
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if cStdout != nil {
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cStdout.Close()
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}
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if cStderr != nil {
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cStderr.Close()
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}
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}()
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}
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if tty {
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_, err = utils.CopyEscapable(cStdin, stdin)
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} else {
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_, err = io.Copy(cStdin, stdin)
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}
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if err == io.ErrClosedPipe {
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err = nil
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}
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if err != nil {
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log.Errorf("attach: stdin: %s", err)
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}
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errors <- err
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}()
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}
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}
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if stdout != nil {
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nJobs++
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// Get a reader end of a pipe that is attached as stdout to the container.
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if p, err := streamConfig.StdoutPipe(); err != nil {
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errors <- err
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} else {
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cStdout = p
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go func() {
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log.Debugf("attach: stdout: begin")
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defer log.Debugf("attach: stdout: end")
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// If we are in StdinOnce mode, then close stdin
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if stdinOnce && stdin != nil {
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defer stdin.Close()
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}
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if stdinCloser != nil {
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defer stdinCloser.Close()
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}
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_, err := io.Copy(stdout, cStdout)
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if err == io.ErrClosedPipe {
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err = nil
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}
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if err != nil {
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log.Errorf("attach: stdout: %s", err)
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}
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errors <- err
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}()
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}
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} else {
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// Point stdout of container to a no-op writer.
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go func() {
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if stdinCloser != nil {
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defer stdinCloser.Close()
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}
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if cStdout, err := streamConfig.StdoutPipe(); err != nil {
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log.Errorf("attach: stdout pipe: %s", err)
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} else {
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io.Copy(&ioutils.NopWriter{}, cStdout)
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}
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}()
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}
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if stderr != nil {
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nJobs++
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if p, err := streamConfig.StderrPipe(); err != nil {
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errors <- err
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} else {
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cStderr = p
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go func() {
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log.Debugf("attach: stderr: begin")
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defer log.Debugf("attach: stderr: end")
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// If we are in StdinOnce mode, then close stdin
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// Why are we closing stdin here and above while handling stdout?
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if stdinOnce && stdin != nil {
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defer stdin.Close()
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}
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if stdinCloser != nil {
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defer stdinCloser.Close()
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}
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_, err := io.Copy(stderr, cStderr)
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if err == io.ErrClosedPipe {
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err = nil
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}
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if err != nil {
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log.Errorf("attach: stderr: %s", err)
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}
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errors <- err
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}()
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}
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} else {
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// Point stderr at a no-op writer.
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go func() {
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if stdinCloser != nil {
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defer stdinCloser.Close()
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}
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if cStderr, err := streamConfig.StderrPipe(); err != nil {
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log.Errorf("attach: stdout pipe: %s", err)
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} else {
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io.Copy(&ioutils.NopWriter{}, cStderr)
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}
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}()
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}
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return promise.Go(func() error {
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defer func() {
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if cStdout != nil {
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cStdout.Close()
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}
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if cStderr != nil {
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cStderr.Close()
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}
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}()
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// FIXME: how to clean up the stdin goroutine without the unwanted side effect
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// of closing the passed stdin? Add an intermediary io.Pipe?
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for i := 0; i < nJobs; i++ {
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log.Debugf("attach: waiting for job %d/%d", i+1, nJobs)
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if err := <-errors; err != nil {
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log.Errorf("attach: job %d returned error %s, aborting all jobs", i+1, err)
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return err
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}
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log.Debugf("attach: job %d completed successfully", i+1)
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}
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log.Debugf("attach: all jobs completed successfully")
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return nil
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})
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}
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