/
saveVm.go
375 lines (342 loc) · 9.08 KB
/
saveVm.go
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package main
import (
"archive/tar"
"bytes"
"compress/gzip"
"fmt"
"io"
"net"
"net/url"
"os"
"path/filepath"
"strings"
"time"
"github.com/Cloud-Foundations/Dominator/lib/errors"
"github.com/Cloud-Foundations/Dominator/lib/format"
"github.com/Cloud-Foundations/Dominator/lib/fsutil"
"github.com/Cloud-Foundations/Dominator/lib/json"
"github.com/Cloud-Foundations/Dominator/lib/log"
"github.com/Cloud-Foundations/Dominator/lib/rsync"
"github.com/Cloud-Foundations/Dominator/lib/srpc"
proto "github.com/Cloud-Foundations/Dominator/proto/hypervisor"
)
type directorySaver struct {
dirname string
filename string // If != "", lock all files to this filename.
}
type gzipCompressor struct{}
type tarSaver struct {
closer io.Closer
header tar.Header
writer *tar.Writer
}
type tarWriter struct {
writer *tar.Writer
}
type wrappedWriteCloser struct {
real io.Closer
wrap io.WriteCloser
}
type writerMaker interface {
MakeWriter(w io.WriteCloser) io.WriteCloser
}
type writeSeekCloser interface {
io.Closer
io.WriteSeeker
}
type vmSaver interface {
Close() error
CopyToFile(filename string, reader io.Reader, length uint64) error
OpenReader(filename string) (io.ReadCloser, uint64, error)
OpenWriter(filename string, length uint64) (writeSeekCloser, error)
}
func copyVolumeToVmSaver(saver vmSaver, client *srpc.Client, ipAddr net.IP,
volIndex uint, size uint64, logger log.DebugLogger) error {
var filename string
if volIndex == 0 {
filename = "root"
} else {
filename = fmt.Sprintf("secondary-volume.%d", volIndex-1)
}
if reader, initialFileSize, err := saver.OpenReader(filename); err != nil {
return err
} else {
if reader != nil {
defer reader.Close()
} else {
if initialFileSize > size {
return errors.New("file larger than volume")
}
}
if writer, err := saver.OpenWriter(filename, size); err != nil {
return err
} else {
err := copyVmVolumeToWriter(writer, reader, initialFileSize,
client, ipAddr, volIndex, size, logger)
if err != nil {
writer.Close()
return err
}
return writer.Close()
}
}
}
func copyVmVolumeToWriter(writer io.WriteSeeker, reader io.Reader,
initialFileSize uint64, client *srpc.Client, ipAddr net.IP, volIndex uint,
size uint64, logger log.DebugLogger) error {
request := proto.GetVmVolumeRequest{
IpAddress: ipAddr,
VolumeIndex: volIndex,
}
conn, err := client.Call("Hypervisor.GetVmVolume")
if err != nil {
return err
}
defer conn.Close()
if err := conn.Encode(request); err != nil {
return fmt.Errorf("error encoding request: %s", err)
}
if err := conn.Flush(); err != nil {
return err
}
var response proto.GetVmVolumeResponse
if err := conn.Decode(&response); err != nil {
return err
}
if err := errors.New(response.Error); err != nil {
return err
}
startTime := time.Now()
stats, err := rsync.GetBlocks(conn, conn, conn, reader, writer,
size, initialFileSize)
if err != nil {
return err
}
duration := time.Since(startTime)
speed := uint64(float64(stats.NumRead) / duration.Seconds())
logger.Debugf(0, "sent %s B, received %s/%s B (%.0f * speedup, %s/s)\n",
format.FormatBytes(stats.NumWritten), format.FormatBytes(stats.NumRead),
format.FormatBytes(size),
float64(size)/float64(stats.NumRead+stats.NumWritten),
format.FormatBytes(speed))
return nil
}
func encodeJsonToVmSaver(saver vmSaver, filename string,
data interface{}) error {
buffer := &bytes.Buffer{}
if err := json.WriteWithIndent(buffer, " ", data); err != nil {
return err
}
return saver.CopyToFile(filename, buffer, uint64(buffer.Len()))
}
func saveVmSubcommand(args []string, logger log.DebugLogger) error {
if err := saveVm(args[0], args[1], logger); err != nil {
return fmt.Errorf("error saving VM: %s", err)
}
return nil
}
func saveVm(vmHostname, destination string, logger log.DebugLogger) error {
if vmIP, hypervisor, err := lookupVmAndHypervisor(vmHostname); err != nil {
return err
} else {
return saveVmOnHypervisor(hypervisor, vmIP, destination, logger)
}
}
func saveVmOnHypervisor(hypervisor string, ipAddr net.IP, destination string,
logger log.DebugLogger) error {
client, err := dialHypervisor(hypervisor)
if err != nil {
return err
}
defer client.Close()
vmInfo, err := getVmInfoClient(client, ipAddr)
if err != nil {
return err
}
u, err := url.Parse(destination)
if err != nil {
return err
}
var saver vmSaver
if u.Scheme == "dir" {
if realSaver, err := newDirectorySaver(u.Path); err != nil {
return err
} else {
saver = realSaver
}
} else if u.Scheme == "file" {
if strings.HasSuffix(u.Path, ".tar") {
if saver, err = newTarSaver(u.Path, nil); err != nil {
return err
}
} else if strings.HasSuffix(u.Path, ".tar.gz") ||
strings.HasSuffix(u.Path, ".tgz") {
if saver, err = newTarSaver(u.Path, gzipCompressor{}); err != nil {
return err
}
} else {
return fmt.Errorf("unknown extension: %s", u.Path)
}
} else {
return fmt.Errorf("unknown scheme: %s", u.Scheme)
}
logger.Debugln(0, "saving metadata")
if err := encodeJsonToVmSaver(saver, "info.json", vmInfo); err != nil {
return err
}
conn, length, err := callGetVmUserData(client, ipAddr)
if err != nil {
return err
}
if length > 0 {
logger.Debugln(0, "saving user data")
err = saver.CopyToFile("user-data.raw", conn, length)
}
conn.Close()
if err != nil {
return err
}
for index, volume := range vmInfo.Volumes {
err := copyVolumeToVmSaver(saver, client, ipAddr, uint(index),
volume.Size, logger)
if err != nil {
return err
}
}
return saver.Close()
}
func newDirectorySaver(dirname string) (*directorySaver, error) {
if dirname != "" {
if err := os.MkdirAll(dirname, fsutil.DirPerms); err != nil {
return nil, err
}
}
return &directorySaver{dirname: dirname}, nil
}
func (saver *directorySaver) Close() error {
return nil
}
func (saver *directorySaver) CopyToFile(filename string, reader io.Reader,
length uint64) error {
file, err := os.OpenFile(saver.Filename(filename), os.O_WRONLY|os.O_CREATE,
fsutil.PrivateFilePerms)
if err != nil {
return err
}
if _, err := io.CopyN(file, reader, int64(length)); err != nil {
file.Close()
return err
}
return file.Close()
}
func (saver *directorySaver) Filename(filename string) string {
if saver.filename != "" {
return saver.filename
}
return filepath.Join(saver.dirname, filename)
}
func (saver *directorySaver) OpenReader(filename string) (
io.ReadCloser, uint64, error) {
file, err := os.OpenFile(saver.Filename(filename), os.O_RDONLY, 0)
if err != nil {
if os.IsNotExist(err) {
return nil, 0, nil
}
return nil, 0, err
} else if fi, err := file.Stat(); err != nil {
file.Close()
return nil, 0, err
} else {
return file, uint64(fi.Size()), nil
}
}
func (saver *directorySaver) OpenWriter(filename string, length uint64) (
writeSeekCloser, error) {
return os.OpenFile(saver.Filename(filename),
os.O_WRONLY|os.O_CREATE, fsutil.PrivateFilePerms)
}
func (gzipCompressor) MakeWriter(w io.WriteCloser) io.WriteCloser {
return &wrappedWriteCloser{real: w, wrap: gzip.NewWriter(w)}
}
func newTarSaver(filename string, compressor writerMaker) (*tarSaver, error) {
file, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE,
fsutil.PrivateFilePerms)
if err != nil {
return nil, err
}
writeCloser := io.WriteCloser(file)
if compressor != nil {
writeCloser = compressor.MakeWriter(writeCloser)
}
return &tarSaver{
closer: writeCloser,
header: tar.Header{
Uid: os.Getuid(),
Gid: os.Getgid(),
Format: tar.FormatPAX,
},
writer: tar.NewWriter(writeCloser),
}, nil
}
func (saver *tarSaver) Close() error {
if err := saver.writer.Close(); err != nil {
saver.closer.Close()
return err
}
return saver.closer.Close()
}
func (saver *tarSaver) CopyToFile(filename string, reader io.Reader,
length uint64) error {
if writer, err := saver.OpenWriter(filename, length); err != nil {
return err
} else if _, err := io.CopyN(writer, reader, int64(length)); err != nil {
writer.Close()
return err
} else {
return writer.Close()
}
}
func (saver *tarSaver) OpenReader(filename string) (
io.ReadCloser, uint64, error) {
return nil, 0, nil
}
func (saver *tarSaver) OpenWriter(filename string, length uint64) (
writeSeekCloser, error) {
header := saver.header
header.Typeflag = tar.TypeReg
header.Name = filename
header.Size = int64(length)
header.Mode = 0400
header.ModTime = time.Now()
header.AccessTime = header.ModTime
header.ChangeTime = header.ModTime
if err := saver.writer.WriteHeader(&header); err != nil {
return nil, err
}
return &tarWriter{saver.writer}, nil
}
func (w tarWriter) Close() error {
return w.writer.Flush()
}
func (w tarWriter) Seek(offset int64, whence int) (int64, error) {
if offset == 0 && whence == io.SeekStart {
return 0, nil
}
if offset == 0 && whence == io.SeekCurrent {
return 0, nil
}
return 0, errors.New("cannot seek")
}
func (w tarWriter) Write(p []byte) (n int, err error) {
return w.writer.Write(p)
}
func (w *wrappedWriteCloser) Close() error {
if err := w.wrap.Close(); err != nil {
w.real.Close()
return err
}
return w.real.Close()
}
func (w *wrappedWriteCloser) Write(p []byte) (n int, err error) {
return w.wrap.Write(p)
}