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176 lines
4.3 KiB
Go
176 lines
4.3 KiB
Go
package stream // import "github.com/docker/docker/container/stream"
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import (
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"context"
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"io"
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"github.com/docker/docker/pkg/pools"
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"github.com/docker/docker/pkg/term"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"golang.org/x/sync/errgroup"
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)
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var defaultEscapeSequence = []byte{16, 17} // ctrl-p, ctrl-q
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// AttachConfig is the config struct used to attach a client to a stream's stdio
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type AttachConfig struct {
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// Tells the attach copier that the stream's stdin is a TTY and to look for
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// escape sequences in stdin to detach from the stream.
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// When true the escape sequence is not passed to the underlying stream
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TTY bool
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// Specifies the detach keys the client will be using
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// Only useful when `TTY` is true
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DetachKeys []byte
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// CloseStdin signals that once done, stdin for the attached stream should be closed
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// For example, this would close the attached container's stdin.
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CloseStdin bool
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// UseStd* indicate whether the client has requested to be connected to the
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// given stream or not. These flags are used instead of checking Std* != nil
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// at points before the client streams Std* are wired up.
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UseStdin, UseStdout, UseStderr bool
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// CStd* are the streams directly connected to the container
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CStdin io.WriteCloser
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CStdout, CStderr io.ReadCloser
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// Provide client streams to wire up to
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Stdin io.ReadCloser
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Stdout, Stderr io.Writer
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}
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// AttachStreams attaches the container's streams to the AttachConfig
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func (c *Config) AttachStreams(cfg *AttachConfig) {
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if cfg.UseStdin {
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cfg.CStdin = c.StdinPipe()
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}
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if cfg.UseStdout {
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cfg.CStdout = c.StdoutPipe()
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}
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if cfg.UseStderr {
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cfg.CStderr = c.StderrPipe()
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}
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}
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// CopyStreams starts goroutines to copy data in and out to/from the container
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func (c *Config) CopyStreams(ctx context.Context, cfg *AttachConfig) <-chan error {
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var group errgroup.Group
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// Connect stdin of container to the attach stdin stream.
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if cfg.Stdin != nil {
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group.Go(func() error {
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logrus.Debug("attach: stdin: begin")
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defer logrus.Debug("attach: stdin: end")
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defer func() {
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if cfg.CloseStdin && !cfg.TTY {
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cfg.CStdin.Close()
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} else {
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// No matter what, when stdin is closed (io.Copy unblock), close stdout and stderr
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if cfg.CStdout != nil {
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cfg.CStdout.Close()
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}
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if cfg.CStderr != nil {
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cfg.CStderr.Close()
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}
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}
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}()
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var err error
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if cfg.TTY {
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_, err = copyEscapable(cfg.CStdin, cfg.Stdin, cfg.DetachKeys)
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} else {
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_, err = pools.Copy(cfg.CStdin, cfg.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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logrus.WithError(err).Debug("error on attach stdin")
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return errors.Wrap(err, "error on attach stdin")
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}
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return nil
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})
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}
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attachStream := func(name string, stream io.Writer, streamPipe io.ReadCloser) error {
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logrus.Debugf("attach: %s: begin", name)
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defer logrus.Debugf("attach: %s: end", name)
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defer func() {
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// Make sure stdin gets closed
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if cfg.Stdin != nil {
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cfg.Stdin.Close()
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}
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streamPipe.Close()
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}()
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_, err := pools.Copy(stream, streamPipe)
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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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logrus.WithError(err).Debugf("attach: %s", name)
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return errors.Wrapf(err, "error attaching %s stream", name)
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}
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return nil
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}
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if cfg.Stdout != nil {
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group.Go(func() error {
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return attachStream("stdout", cfg.Stdout, cfg.CStdout)
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})
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}
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if cfg.Stderr != nil {
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group.Go(func() error {
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return attachStream("stderr", cfg.Stderr, cfg.CStderr)
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})
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}
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errs := make(chan error, 1)
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go func() {
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defer logrus.Debug("attach done")
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groupErr := make(chan error, 1)
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go func() {
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groupErr <- group.Wait()
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}()
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select {
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case <-ctx.Done():
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// close all pipes
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if cfg.CStdin != nil {
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cfg.CStdin.Close()
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}
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if cfg.CStdout != nil {
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cfg.CStdout.Close()
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}
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if cfg.CStderr != nil {
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cfg.CStderr.Close()
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}
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// Now with these closed, wait should return.
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if err := group.Wait(); err != nil {
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errs <- err
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return
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}
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errs <- ctx.Err()
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case err := <-groupErr:
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errs <- err
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}
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}()
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return errs
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}
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func copyEscapable(dst io.Writer, src io.ReadCloser, keys []byte) (written int64, err error) {
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if len(keys) == 0 {
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keys = defaultEscapeSequence
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}
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pr := term.NewEscapeProxy(src, keys)
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defer src.Close()
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return pools.Copy(dst, pr)
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}
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