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package remote // import "github.com/docker/docker/libcontainerd/remote"
import (
"io"
"net"
"sync"
winio "github.com/Microsoft/go-winio"
"github.com/containerd/containerd/cio"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
type delayedConnection struct {
l net.Listener
con net.Conn
wg sync.WaitGroup
once sync.Once
}
func (dc *delayedConnection) Write(p []byte) (int, error) {
dc.wg.Wait()
if dc.con != nil {
return dc.con.Write(p)
}
return 0, errors.New("use of closed network connection")
}
func (dc *delayedConnection) Read(p []byte) (int, error) {
dc.wg.Wait()
if dc.con != nil {
return dc.con.Read(p)
}
return 0, errors.New("use of closed network connection")
}
func (dc *delayedConnection) unblockConnectionWaiters() {
defer dc.once.Do(func() {
dc.wg.Done()
})
}
func (dc *delayedConnection) Close() error {
dc.l.Close()
if dc.con != nil {
return dc.con.Close()
}
dc.unblockConnectionWaiters()
return nil
}
type stdioPipes struct {
stdin io.WriteCloser
stdout io.ReadCloser
stderr io.ReadCloser
}
// newStdioPipes creates actual fifos for stdio.
func (c *client) newStdioPipes(fifos *cio.FIFOSet) (_ *stdioPipes, err error) {
p := &stdioPipes{}
if fifos.Stdin != "" {
c.logger.WithFields(logrus.Fields{"stdin": fifos.Stdin}).Debug("listen")
l, err := winio.ListenPipe(fifos.Stdin, nil)
if err != nil {
return nil, errors.Wrapf(err, "failed to create stdin pipe %s", fifos.Stdin)
}
dc := &delayedConnection{
l: l,
}
dc.wg.Add(1)
defer func() {
if err != nil {
dc.Close()
}
}()
p.stdin = dc
go func() {
c.logger.WithFields(logrus.Fields{"stdin": fifos.Stdin}).Debug("accept")
conn, err := l.Accept()
if err != nil {
dc.Close()
if err != winio.ErrPipeListenerClosed {
c.logger.WithError(err).Errorf("failed to accept stdin connection on %s", fifos.Stdin)
}
return
}
c.logger.WithFields(logrus.Fields{"stdin": fifos.Stdin}).Debug("connected")
dc.con = conn
dc.unblockConnectionWaiters()
}()
}
if fifos.Stdout != "" {
c.logger.WithFields(logrus.Fields{"stdout": fifos.Stdout}).Debug("listen")
l, err := winio.ListenPipe(fifos.Stdout, nil)
if err != nil {
return nil, errors.Wrapf(err, "failed to create stdout pipe %s", fifos.Stdout)
}
dc := &delayedConnection{
l: l,
}
dc.wg.Add(1)
defer func() {
if err != nil {
dc.Close()
}
}()
p.stdout = dc
go func() {
c.logger.WithFields(logrus.Fields{"stdout": fifos.Stdout}).Debug("accept")
conn, err := l.Accept()
if err != nil {
dc.Close()
if err != winio.ErrPipeListenerClosed {
c.logger.WithError(err).Errorf("failed to accept stdout connection on %s", fifos.Stdout)
}
return
}
c.logger.WithFields(logrus.Fields{"stdout": fifos.Stdout}).Debug("connected")
dc.con = conn
dc.unblockConnectionWaiters()
}()
}
if fifos.Stderr != "" {
c.logger.WithFields(logrus.Fields{"stderr": fifos.Stderr}).Debug("listen")
l, err := winio.ListenPipe(fifos.Stderr, nil)
if err != nil {
return nil, errors.Wrapf(err, "failed to create stderr pipe %s", fifos.Stderr)
}
dc := &delayedConnection{
l: l,
}
dc.wg.Add(1)
defer func() {
if err != nil {
dc.Close()
}
}()
p.stderr = dc
go func() {
c.logger.WithFields(logrus.Fields{"stderr": fifos.Stderr}).Debug("accept")
conn, err := l.Accept()
if err != nil {
dc.Close()
if err != winio.ErrPipeListenerClosed {
c.logger.WithError(err).Errorf("failed to accept stderr connection on %s", fifos.Stderr)
}
return
}
c.logger.WithFields(logrus.Fields{"stderr": fifos.Stderr}).Debug("connected")
dc.con = conn
dc.unblockConnectionWaiters()
}()
}
return p, nil
}
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