Golang DockerCli.HoldHijackedConnection方法代码示例

func runAttach(dockerCli *client.DockerCli, opts *attachOptions) error {
	ctx := context.Background()

	c, err := dockerCli.Client().ContainerInspect(ctx, opts.container)
	if err != nil {
		return err
	}

	if !c.State.Running {
		return fmt.Errorf("You cannot attach to a stopped container, start it first")
	}

	if c.State.Paused {
		return fmt.Errorf("You cannot attach to a paused container, unpause it first")
	}

	if err := dockerCli.CheckTtyInput(!opts.noStdin, c.Config.Tty); err != nil {
		return err
	}

	if opts.detachKeys != "" {
		dockerCli.ConfigFile().DetachKeys = opts.detachKeys
	}

	options := types.ContainerAttachOptions{
		Stream:     true,
		Stdin:      !opts.noStdin && c.Config.OpenStdin,
		Stdout:     true,
		Stderr:     true,
		DetachKeys: dockerCli.ConfigFile().DetachKeys,
	}

	var in io.ReadCloser
	if options.Stdin {
		in = dockerCli.In()
	}

	if opts.proxy && !c.Config.Tty {
		sigc := dockerCli.ForwardAllSignals(ctx, opts.container)
		defer signal.StopCatch(sigc)
	}

	resp, errAttach := dockerCli.Client().ContainerAttach(ctx, opts.container, options)
	if errAttach != nil && errAttach != httputil.ErrPersistEOF {
		// ContainerAttach returns an ErrPersistEOF (connection closed)
		// means server met an error and put it in Hijacked connection
		// keep the error and read detailed error message from hijacked connection later
		return errAttach
	}
	defer resp.Close()

	if c.Config.Tty && dockerCli.IsTerminalOut() {
		height, width := dockerCli.GetTtySize()
		// To handle the case where a user repeatedly attaches/detaches without resizing their
		// terminal, the only way to get the shell prompt to display for attaches 2+ is to artificially
		// resize it, then go back to normal. Without this, every attach after the first will
		// require the user to manually resize or hit enter.
		dockerCli.ResizeTtyTo(ctx, opts.container, height+1, width+1, false)

		// After the above resizing occurs, the call to MonitorTtySize below will handle resetting back
		// to the actual size.
		if err := dockerCli.MonitorTtySize(ctx, opts.container, false); err != nil {
			logrus.Debugf("Error monitoring TTY size: %s", err)
		}
	}
	if err := dockerCli.HoldHijackedConnection(ctx, c.Config.Tty, in, dockerCli.Out(), dockerCli.Err(), resp); err != nil {
		return err
	}

	if errAttach != nil {
		return errAttach
	}

	_, status, err := getExitCode(dockerCli, ctx, opts.container)
	if err != nil {
		return err
	}
	if status != 0 {
		return cli.StatusError{StatusCode: status}
	}

	return nil
}

//.........这里部分代码省略.........
		if config.AttachStdout {
			out = stdout
		}
		if config.AttachStderr {
			if config.Tty {
				cerr = stdout
			} else {
				cerr = stderr
			}
		}

		if opts.detachKeys != "" {
			dockerCli.ConfigFile().DetachKeys = opts.detachKeys
		}

		options := types.ContainerAttachOptions{
			Stream:     true,
			Stdin:      config.AttachStdin,
			Stdout:     config.AttachStdout,
			Stderr:     config.AttachStderr,
			DetachKeys: dockerCli.ConfigFile().DetachKeys,
		}

		resp, errAttach := client.ContainerAttach(ctx, createResponse.ID, options)
		if errAttach != nil && errAttach != httputil.ErrPersistEOF {
			// ContainerAttach returns an ErrPersistEOF (connection closed)
			// means server met an error and put it in Hijacked connection
			// keep the error and read detailed error message from hijacked connection later
			return errAttach
		}
		defer resp.Close()

		errCh = promise.Go(func() error {
			errHijack := dockerCli.HoldHijackedConnection(ctx, config.Tty, in, out, cerr, resp)
			if errHijack == nil {
				return errAttach
			}
			return errHijack
		})
	}

	if opts.autoRemove {
		defer func() {
			// Explicitly not sharing the context as it could be "Done" (by calling cancelFun)
			// and thus the container would not be removed.
			if err := removeContainer(dockerCli, context.Background(), createResponse.ID, true, false, true); err != nil {
				fmt.Fprintf(stderr, "%v\n", err)
			}
		}()
	}

	//start the container
	if err := client.ContainerStart(ctx, createResponse.ID, types.ContainerStartOptions{}); err != nil {
		// If we have holdHijackedConnection, we should notify
		// holdHijackedConnection we are going to exit and wait
		// to avoid the terminal are not restored.
		if attach {
			cancelFun()
			<-errCh
		}

		reportError(stderr, cmdPath, err.Error(), false)
		return runStartContainerErr(err)
	}

	if (config.AttachStdin || config.AttachStdout || config.AttachStderr) && config.Tty && dockerCli.IsTerminalOut() {

func runStart(dockerCli *client.DockerCli, opts *startOptions) error {
	ctx, cancelFun := context.WithCancel(context.Background())

	if opts.attach || opts.openStdin {
		// We're going to attach to a container.
		// 1. Ensure we only have one container.
		if len(opts.containers) > 1 {
			return fmt.Errorf("You cannot start and attach multiple containers at once.")
		}

		// 2. Attach to the container.
		container := opts.containers[0]
		c, err := dockerCli.Client().ContainerInspect(ctx, container)
		if err != nil {
			return err
		}

		// We always use c.ID instead of container to maintain consistency during `docker start`
		if !c.Config.Tty {
			sigc := dockerCli.ForwardAllSignals(ctx, c.ID)
			defer signal.StopCatch(sigc)
		}

		if opts.detachKeys != "" {
			dockerCli.ConfigFile().DetachKeys = opts.detachKeys
		}

		options := types.ContainerAttachOptions{
			Stream:     true,
			Stdin:      opts.openStdin && c.Config.OpenStdin,
			Stdout:     true,
			Stderr:     true,
			DetachKeys: dockerCli.ConfigFile().DetachKeys,
		}

		var in io.ReadCloser

		if options.Stdin {
			in = dockerCli.In()
		}

		resp, errAttach := dockerCli.Client().ContainerAttach(ctx, c.ID, options)
		if errAttach != nil && errAttach != httputil.ErrPersistEOF {
			// ContainerAttach return an ErrPersistEOF (connection closed)
			// means server met an error and put it in Hijacked connection
			// keep the error and read detailed error message from hijacked connection
			return errAttach
		}
		defer resp.Close()
		cErr := promise.Go(func() error {
			errHijack := dockerCli.HoldHijackedConnection(ctx, c.Config.Tty, in, dockerCli.Out(), dockerCli.Err(), resp)
			if errHijack == nil {
				return errAttach
			}
			return errHijack
		})

		// 3. Start the container.
		if err := dockerCli.Client().ContainerStart(ctx, c.ID, types.ContainerStartOptions{}); err != nil {
			cancelFun()
			<-cErr
			return err
		}

		// 4. Wait for attachment to break.
		if c.Config.Tty && dockerCli.IsTerminalOut() {
			if err := dockerCli.MonitorTtySize(ctx, c.ID, false); err != nil {
				fmt.Fprintf(dockerCli.Err(), "Error monitoring TTY size: %s\n", err)
			}
		}
		if attchErr := <-cErr; attchErr != nil {
			return attchErr
		}
		_, status, err := getExitCode(dockerCli, ctx, c.ID)
		if err != nil {
			return err
		}
		if status != 0 {
			return cli.StatusError{StatusCode: status}
		}
	} else {
		// We're not going to attach to anything.
		// Start as many containers as we want.
		return startContainersWithoutAttachments(dockerCli, ctx, opts.containers)
	}

	return nil
}

func runExec(dockerCli *client.DockerCli, opts *execOptions, container string, execCmd []string) error {
	execConfig, err := parseExec(opts, container, execCmd)
	// just in case the ParseExec does not exit
	if container == "" || err != nil {
		return cli.StatusError{StatusCode: 1}
	}

	if opts.detachKeys != "" {
		dockerCli.ConfigFile().DetachKeys = opts.detachKeys
	}

	// Send client escape keys
	execConfig.DetachKeys = dockerCli.ConfigFile().DetachKeys

	ctx := context.Background()

	response, err := dockerCli.Client().ContainerExecCreate(ctx, container, *execConfig)
	if err != nil {
		return err
	}

	execID := response.ID
	if execID == "" {
		fmt.Fprintf(dockerCli.Out(), "exec ID empty")
		return nil
	}

	//Temp struct for execStart so that we don't need to transfer all the execConfig
	if !execConfig.Detach {
		if err := dockerCli.CheckTtyInput(execConfig.AttachStdin, execConfig.Tty); err != nil {
			return err
		}
	} else {
		execStartCheck := types.ExecStartCheck{
			Detach: execConfig.Detach,
			Tty:    execConfig.Tty,
		}

		if err := dockerCli.Client().ContainerExecStart(ctx, execID, execStartCheck); err != nil {
			return err
		}
		// For now don't print this - wait for when we support exec wait()
		// fmt.Fprintf(dockerCli.Out(), "%s\n", execID)
		return nil
	}

	// Interactive exec requested.
	var (
		out, stderr io.Writer
		in          io.ReadCloser
		errCh       chan error
	)

	if execConfig.AttachStdin {
		in = dockerCli.In()
	}
	if execConfig.AttachStdout {
		out = dockerCli.Out()
	}
	if execConfig.AttachStderr {
		if execConfig.Tty {
			stderr = dockerCli.Out()
		} else {
			stderr = dockerCli.Err()
		}
	}

	resp, err := dockerCli.Client().ContainerExecAttach(ctx, execID, *execConfig)
	if err != nil {
		return err
	}
	defer resp.Close()
	errCh = promise.Go(func() error {
		return dockerCli.HoldHijackedConnection(ctx, execConfig.Tty, in, out, stderr, resp)
	})

	if execConfig.Tty && dockerCli.IsTerminalIn() {
		if err := dockerCli.MonitorTtySize(ctx, execID, true); err != nil {
			fmt.Fprintf(dockerCli.Err(), "Error monitoring TTY size: %s\n", err)
		}
	}

	if err := <-errCh; err != nil {
		logrus.Debugf("Error hijack: %s", err)
		return err
	}

	var status int
	if _, status, err = dockerCli.GetExecExitCode(ctx, execID); err != nil {
		return err
	}

	if status != 0 {
		return cli.StatusError{StatusCode: status}
	}

	return nil
}