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moby--moby/daemon/attach.go

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package daemon
import (
"encoding/json"
"io"
"os"
"sync"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/jsonlog"
"github.com/docker/docker/pkg/promise"
)
func (c *Container) AttachWithLogs(stdin io.ReadCloser, stdout, stderr io.Writer, logs, stream bool) error {
if logs {
cLog, err := c.ReadLog("json")
if err != nil && os.IsNotExist(err) {
// Legacy logs
logrus.Debugf("Old logs format")
if stdout != nil {
cLog, err := c.ReadLog("stdout")
if err != nil {
logrus.Errorf("Error reading logs (stdout): %s", err)
} else if _, err := io.Copy(stdout, cLog); err != nil {
logrus.Errorf("Error streaming logs (stdout): %s", err)
}
}
if stderr != nil {
cLog, err := c.ReadLog("stderr")
if err != nil {
logrus.Errorf("Error reading logs (stderr): %s", err)
} else if _, err := io.Copy(stderr, cLog); err != nil {
logrus.Errorf("Error streaming logs (stderr): %s", err)
}
}
} else if err != nil {
logrus.Errorf("Error reading logs (json): %s", err)
} else {
dec := json.NewDecoder(cLog)
for {
l := &jsonlog.JSONLog{}
if err := dec.Decode(l); err == io.EOF {
break
} else if err != nil {
logrus.Errorf("Error streaming logs: %s", err)
break
}
if l.Stream == "stdout" && stdout != nil {
io.WriteString(stdout, l.Log)
}
if l.Stream == "stderr" && stderr != nil {
io.WriteString(stderr, l.Log)
}
}
}
}
//stream
if stream {
var stdinPipe io.ReadCloser
if stdin != nil {
r, w := io.Pipe()
go func() {
defer w.Close()
defer logrus.Debugf("Closing buffered stdin pipe")
io.Copy(w, stdin)
}()
stdinPipe = r
}
<-c.Attach(stdinPipe, stdout, stderr)
// If we are in stdinonce mode, wait for the process to end
// otherwise, simply return
if c.Config.StdinOnce && !c.Config.Tty {
c.WaitStop(-1 * time.Second)
}
}
return nil
}
func (c *Container) Attach(stdin io.ReadCloser, stdout io.Writer, stderr io.Writer) chan error {
return attach(&c.StreamConfig, c.Config.OpenStdin, c.Config.StdinOnce, c.Config.Tty, stdin, stdout, stderr)
}
func attach(streamConfig *StreamConfig, openStdin, stdinOnce, tty bool, stdin io.ReadCloser, stdout io.Writer, stderr io.Writer) chan error {
var (
cStdout, cStderr io.ReadCloser
cStdin io.WriteCloser
wg sync.WaitGroup
errors = make(chan error, 3)
)
if stdin != nil && openStdin {
cStdin = streamConfig.StdinPipe()
wg.Add(1)
}
if stdout != nil {
cStdout = streamConfig.StdoutPipe()
wg.Add(1)
}
if stderr != nil {
cStderr = streamConfig.StderrPipe()
wg.Add(1)
}
// Connect stdin of container to the http conn.
go func() {
if stdin == nil || !openStdin {
return
}
logrus.Debugf("attach: stdin: begin")
defer func() {
if stdinOnce && !tty {
cStdin.Close()
} else {
// No matter what, when stdin is closed (io.Copy unblock), close stdout and stderr
if cStdout != nil {
cStdout.Close()
}
if cStderr != nil {
cStderr.Close()
}
}
wg.Done()
logrus.Debugf("attach: stdin: end")
}()
var err error
if tty {
_, err = copyEscapable(cStdin, stdin)
} else {
_, err = io.Copy(cStdin, stdin)
}
if err == io.ErrClosedPipe {
err = nil
}
if err != nil {
logrus.Errorf("attach: stdin: %s", err)
errors <- err
return
}
}()
attachStream := func(name string, stream io.Writer, streamPipe io.ReadCloser) {
if stream == nil {
return
}
defer func() {
// Make sure stdin gets closed
if stdin != nil {
stdin.Close()
}
streamPipe.Close()
wg.Done()
logrus.Debugf("attach: %s: end", name)
}()
logrus.Debugf("attach: %s: begin", name)
_, err := io.Copy(stream, streamPipe)
if err == io.ErrClosedPipe {
err = nil
}
if err != nil {
logrus.Errorf("attach: %s: %v", name, err)
errors <- err
}
}
go attachStream("stdout", stdout, cStdout)
go attachStream("stderr", stderr, cStderr)
return promise.Go(func() error {
wg.Wait()
close(errors)
for err := range errors {
if err != nil {
return err
}
}
return nil
})
}
// Code c/c from io.Copy() modified to handle escape sequence
func copyEscapable(dst io.Writer, src io.ReadCloser) (written int64, err error) {
buf := make([]byte, 32*1024)
for {
nr, er := src.Read(buf)
if nr > 0 {
// ---- Docker addition
// char 16 is C-p
if nr == 1 && buf[0] == 16 {
nr, er = src.Read(buf)
// char 17 is C-q
if nr == 1 && buf[0] == 17 {
if err := src.Close(); err != nil {
return 0, err
}
return 0, nil
}
}
// ---- End of docker
nw, ew := dst.Write(buf[0:nr])
if nw > 0 {
written += int64(nw)
}
if ew != nil {
err = ew
break
}
if nr != nw {
err = io.ErrShortWrite
break
}
}
if er == io.EOF {
break
}
if er != nil {
err = er
break
}
}
return written, err
}