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package daemon
import (
"context"
"fmt"
"io"
"github.com/docker/docker/api/types/backend"
"github.com/docker/docker/container"
"github.com/docker/docker/container/stream"
"github.com/docker/docker/daemon/logger"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/pkg/stdcopy"
"github.com/docker/docker/pkg/term"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// 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 errdefs.InvalidParameter(errors.Errorf("Invalid detach 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 errdefs.Conflict(err)
}
if container.IsRestarting() {
err := fmt.Errorf("container %s is restarting, wait until the container is running", prefixOrName)
return errdefs.Conflict(err)
}
cfg := stream.AttachConfig{
UseStdin: c.UseStdin,
UseStdout: c.UseStdout,
UseStderr: c.UseStderr,
TTY: container.Config.Tty,
CloseStdin: container.Config.StdinOnce,
DetachKeys: keys,
}
container.StreamConfig.AttachStreams(&cfg)
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)
}
if cfg.UseStdin {
cfg.Stdin = inStream
}
if cfg.UseStdout {
cfg.Stdout = outStream
}
if cfg.UseStderr {
cfg.Stderr = errStream
}
if err := daemon.containerAttach(container, &cfg, c.Logs, c.Stream); 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, doStream bool, attached chan struct{}) error {
container, err := daemon.GetContainer(prefixOrName)
if err != nil {
return err
}
cfg := stream.AttachConfig{
UseStdin: stdin != nil,
UseStdout: stdout != nil,
UseStderr: stderr != nil,
TTY: container.Config.Tty,
CloseStdin: container.Config.StdinOnce,
}
container.StreamConfig.AttachStreams(&cfg)
close(attached)
if cfg.UseStdin {
cfg.Stdin = stdin
}
if cfg.UseStdout {
cfg.Stdout = stdout
}
if cfg.UseStderr {
cfg.Stderr = stderr
}
return daemon.containerAttach(container, &cfg, false, doStream)
}
func (daemon *Daemon) containerAttach(c *container.Container, cfg *stream.AttachConfig, logs, doStream bool) error {
if logs {
logDriver, logCreated, err := daemon.getLogger(c)
if err != nil {
return err
}
if logCreated {
defer func() {
if err = logDriver.Close(); err != nil {
logrus.Errorf("Error closing logger: %v", err)
}
}()
}
cLog, ok := logDriver.(logger.LogReader)
if !ok {
return logger.ErrReadLogsNotSupported{}
}
logs := cLog.ReadLogs(logger.ReadConfig{Tail: -1})
defer logs.Close()
LogLoop:
for {
select {
case msg, ok := <-logs.Msg:
if !ok {
break LogLoop
}
if msg.Source == "stdout" && cfg.Stdout != nil {
cfg.Stdout.Write(msg.Line)
}
if msg.Source == "stderr" && cfg.Stderr != nil {
cfg.Stderr.Write(msg.Line)
}
case err := <-logs.Err:
logrus.Errorf("Error streaming logs: %v", err)
break LogLoop
}
}
}
daemon.LogContainerEvent(c, "attach")
if !doStream {
return nil
}
if cfg.Stdin != nil {
r, w := io.Pipe()
go func(stdin io.ReadCloser) {
defer w.Close()
defer logrus.Debug("Closing buffered stdin pipe")
io.Copy(w, stdin)
}(cfg.Stdin)
cfg.Stdin = r
}
if !c.Config.OpenStdin {
cfg.Stdin = nil
}
if c.Config.StdinOnce && !c.Config.Tty {
// Wait for the container to stop before returning.
waitChan := c.Wait(context.Background(), container.WaitConditionNotRunning)
defer func() {
<-waitChan // Ignore returned exit code.
}()
}
ctx := c.InitAttachContext()
err := <-c.StreamConfig.CopyStreams(ctx, cfg)
if err != nil {
if _, ok := err.(term.EscapeError); ok {
daemon.LogContainerEvent(c, "detach")
} else {
logrus.Errorf("attach failed with error: %v", err)
}
}
return nil
}
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