153 lines
3.7 KiB
Go
153 lines
3.7 KiB
Go
package server
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import (
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"fmt"
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"io"
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"net"
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"os"
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"path/filepath"
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"time"
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"github.com/kubernetes-incubator/cri-o/oci"
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"github.com/kubernetes-incubator/cri-o/utils"
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"github.com/sirupsen/logrus"
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"golang.org/x/net/context"
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"golang.org/x/sys/unix"
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"k8s.io/client-go/tools/remotecommand"
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pb "k8s.io/kubernetes/pkg/kubelet/apis/cri/v1alpha1/runtime"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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)
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/* Sync with stdpipe_t in conmon.c */
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const (
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AttachPipeStdin = 1
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AttachPipeStdout = 2
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AttachPipeStderr = 3
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)
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// Attach prepares a streaming endpoint to attach to a running container.
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func (s *Server) Attach(ctx context.Context, req *pb.AttachRequest) (resp *pb.AttachResponse, err error) {
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const operation = "attach"
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defer func() {
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recordOperation(operation, time.Now())
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recordError(operation, err)
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}()
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logrus.Debugf("AttachRequest %+v", req)
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resp, err = s.GetAttach(req)
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if err != nil {
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return nil, fmt.Errorf("unable to prepare attach endpoint")
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}
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return resp, nil
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}
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// Attach endpoint for streaming.Runtime
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func (ss streamService) Attach(containerID string, inputStream io.Reader, outputStream, errorStream io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize) error {
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c := ss.runtimeServer.GetContainer(containerID)
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if c == nil {
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return fmt.Errorf("could not find container %q", containerID)
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}
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if err := ss.runtimeServer.Runtime().UpdateStatus(c); err != nil {
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return err
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}
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cState := ss.runtimeServer.Runtime().ContainerStatus(c)
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if !(cState.Status == oci.ContainerStateRunning || cState.Status == oci.ContainerStateCreated) {
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return fmt.Errorf("container is not created or running")
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}
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controlPath := filepath.Join(c.BundlePath(), "ctl")
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controlFile, err := os.OpenFile(controlPath, unix.O_WRONLY, 0)
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if err != nil {
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return fmt.Errorf("failed to open container ctl file: %v", err)
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}
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kubecontainer.HandleResizing(resize, func(size remotecommand.TerminalSize) {
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logrus.Infof("Got a resize event: %+v", size)
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_, err := fmt.Fprintf(controlFile, "%d %d %d\n", 1, size.Height, size.Width)
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if err != nil {
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logrus.Infof("Failed to write to control file to resize terminal: %v", err)
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}
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})
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attachSocketPath := filepath.Join(oci.ContainerAttachSocketDir, c.ID(), "attach")
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conn, err := net.DialUnix("unixpacket", nil, &net.UnixAddr{Name: attachSocketPath, Net: "unixpacket"})
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if err != nil {
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return fmt.Errorf("failed to connect to container %s attach socket: %v", c.ID(), err)
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}
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defer conn.Close()
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receiveStdout := make(chan error)
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if outputStream != nil || errorStream != nil {
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go func() {
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receiveStdout <- redirectResponseToOutputStreams(outputStream, errorStream, conn)
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}()
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}
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stdinDone := make(chan error)
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go func() {
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var err error
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if inputStream != nil {
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_, err = utils.CopyDetachable(conn, inputStream, nil)
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conn.CloseWrite()
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}
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stdinDone <- err
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}()
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select {
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case err := <-receiveStdout:
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return err
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case err := <-stdinDone:
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if _, ok := err.(utils.DetachError); ok {
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return nil
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}
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if outputStream != nil || errorStream != nil {
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return <-receiveStdout
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}
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}
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return nil
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}
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func redirectResponseToOutputStreams(outputStream, errorStream io.Writer, conn io.Reader) error {
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var err error
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buf := make([]byte, 8192+1) /* Sync with conmon STDIO_BUF_SIZE */
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for {
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nr, er := conn.Read(buf)
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if nr > 0 {
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var dst io.Writer
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if buf[0] == AttachPipeStdout {
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dst = outputStream
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} else if buf[0] == AttachPipeStderr {
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dst = errorStream
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} else {
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logrus.Infof("Got unexpected attach type %+d", buf[0])
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}
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if dst != nil {
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nw, ew := dst.Write(buf[1:nr])
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if ew != nil {
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err = ew
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break
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}
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if nr != nw+1 {
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err = io.ErrShortWrite
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break
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}
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}
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}
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if er == io.EOF {
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break
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}
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if er != nil {
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err = er
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break
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}
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}
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return err
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}
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