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imdb.go
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imdb.go
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package scanner
import (
"bufio"
"encoding/gob"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"syscall"
"time"
"github.com/Symantec/Dominator/lib/fsutil"
"github.com/Symantec/Dominator/lib/hash"
"github.com/Symantec/Dominator/lib/image"
"github.com/Symantec/Dominator/lib/log"
"github.com/Symantec/Dominator/lib/srpc"
)
const (
dirPerms = syscall.S_IRWXU | syscall.S_IRGRP | syscall.S_IXGRP |
syscall.S_IROTH | syscall.S_IXOTH
filePerms = syscall.S_IRUSR | syscall.S_IWUSR | syscall.S_IRGRP |
syscall.S_IROTH
)
var (
errNoAccess = errors.New("no access to image")
errNoAuthInfo = errors.New("no authentication information")
)
func (imdb *ImageDataBase) addImage(image *image.Image, name string,
authInfo *srpc.AuthInformation) error {
if err := image.Verify(); err != nil {
return err
}
if imageIsExpired(image) {
imdb.logger.Printf("Ignoring already expired image: %s\n", name)
return nil
}
imdb.deduperLock.Lock()
image.ReplaceStrings(imdb.deduper.DeDuplicate)
imdb.deduperLock.Unlock()
imdb.Lock()
defer imdb.Unlock()
if _, ok := imdb.imageMap[name]; ok {
return errors.New("image: " + name + " already exists")
} else {
if err := imdb.checkPermissions(name, authInfo); err != nil {
return err
}
filename := filepath.Join(imdb.baseDir, name)
flags := os.O_CREATE | os.O_RDWR
if imdb.replicationMaster != "" {
flags |= os.O_EXCL
} else {
flags |= os.O_TRUNC
}
file, err := os.OpenFile(filename, flags, filePerms)
if err != nil {
if os.IsExist(err) {
return errors.New("cannot add previously deleted image: " +
name)
}
return err
}
defer file.Close()
w := bufio.NewWriter(file)
defer w.Flush()
writer := fsutil.NewChecksumWriter(w)
defer writer.WriteChecksum()
encoder := gob.NewEncoder(writer)
if err := encoder.Encode(image); err != nil {
os.Remove(filename)
return err
}
if err := w.Flush(); err != nil {
os.Remove(filename)
return err
}
imdb.scheduleExpiration(image, name)
imdb.imageMap[name] = image
imdb.addNotifiers.sendPlain(name, "add", imdb.logger)
imdb.removeFromUnreferencedObjectsListAndSave(image)
return nil
}
}
func (imdb *ImageDataBase) changeImageExpiration(name string,
expiresAt time.Time, authInfo *srpc.AuthInformation) (bool, error) {
imdb.Lock()
defer imdb.Unlock()
if img, ok := imdb.imageMap[name]; !ok {
return false, errors.New("image not found")
} else if err := imdb.checkPermissions(name, authInfo); err != nil {
return false, err
} else if img.ExpiresAt.IsZero() {
return false, errors.New("image does not expire")
} else if expiresAt.IsZero() {
if err := imdb.writeNewExpiration(name, img, expiresAt); err != nil {
return false, err
}
img.ExpiresAt = expiresAt
imdb.addNotifiers.sendPlain(name, "add", imdb.logger)
return true, nil
} else if expiresAt.Before(img.ExpiresAt) {
return false, errors.New("cannot shorten expiration time")
} else if expiresAt.After(img.ExpiresAt) {
if err := imdb.writeNewExpiration(name, img, expiresAt); err != nil {
return false, err
}
img.ExpiresAt = expiresAt
imdb.addNotifiers.sendPlain(name, "add", imdb.logger)
return true, nil
} else {
return false, nil
}
}
// This must be called with the lock held.
func (imdb *ImageDataBase) checkChown(dirname, ownerGroup string,
authInfo *srpc.AuthInformation) error {
if authInfo == nil {
return errNoAuthInfo
}
if authInfo.HaveMethodAccess {
return nil
}
// If owner of parent, any group can be set.
parentDirname := filepath.Dir(dirname)
if directoryMetadata, ok := imdb.directoryMap[parentDirname]; ok {
if directoryMetadata.OwnerGroup != "" {
if _, ok := authInfo.GroupList[directoryMetadata.OwnerGroup]; ok {
return nil
}
}
}
if _, ok := authInfo.GroupList[ownerGroup]; !ok {
return fmt.Errorf("no membership of %s group", ownerGroup)
}
if directoryMetadata, ok := imdb.directoryMap[dirname]; !ok {
return fmt.Errorf("no metadata for: \"%s\"", dirname)
} else if directoryMetadata.OwnerGroup != "" {
if _, ok := authInfo.GroupList[directoryMetadata.OwnerGroup]; ok {
return nil
}
}
return errNoAccess
}
func (imdb *ImageDataBase) checkDirectory(name string) bool {
imdb.RLock()
defer imdb.RUnlock()
_, ok := imdb.directoryMap[name]
return ok
}
func (imdb *ImageDataBase) checkImage(name string) bool {
imdb.RLock()
defer imdb.RUnlock()
_, ok := imdb.imageMap[name]
return ok
}
// This must be called with the lock held.
func (imdb *ImageDataBase) checkPermissions(imageName string,
authInfo *srpc.AuthInformation) error {
if authInfo == nil {
return errNoAuthInfo
}
if authInfo.HaveMethodAccess {
return nil
}
dirname := filepath.Dir(imageName)
if directoryMetadata, ok := imdb.directoryMap[dirname]; !ok {
return fmt.Errorf("no metadata for: \"%s\"", dirname)
} else if directoryMetadata.OwnerGroup != "" {
if _, ok := authInfo.GroupList[directoryMetadata.OwnerGroup]; ok {
return nil
}
}
return errNoAccess
}
func (imdb *ImageDataBase) chownDirectory(dirname, ownerGroup string,
authInfo *srpc.AuthInformation) error {
dirname = filepath.Clean(dirname)
imdb.Lock()
defer imdb.Unlock()
directoryMetadata, ok := imdb.directoryMap[dirname]
if !ok {
return fmt.Errorf("no metadata for: \"%s\"", dirname)
}
if err := imdb.checkChown(dirname, ownerGroup, authInfo); err != nil {
return err
}
directoryMetadata.OwnerGroup = ownerGroup
return imdb.updateDirectoryMetadata(
image.Directory{Name: dirname, Metadata: directoryMetadata})
}
// This must be called with the lock held.
func (imdb *ImageDataBase) updateDirectoryMetadata(
directory image.Directory) error {
oldDirectoryMetadata, ok := imdb.directoryMap[directory.Name]
if ok && directory.Metadata == oldDirectoryMetadata {
return nil
}
if err := imdb.updateDirectoryMetadataFile(directory); err != nil {
return err
}
imdb.directoryMap[directory.Name] = directory.Metadata
imdb.mkdirNotifiers.sendMakeDirectory(directory, imdb.logger)
return nil
}
func (imdb *ImageDataBase) updateDirectoryMetadataFile(
directory image.Directory) error {
filename := filepath.Join(imdb.baseDir, directory.Name, metadataFile)
_, ok := imdb.directoryMap[directory.Name]
if directory.Metadata == (image.DirectoryMetadata{}) {
if !ok {
return nil
}
return os.Remove(filename)
}
file, err := os.OpenFile(filename, os.O_CREATE|os.O_RDWR, filePerms)
if err != nil {
return err
}
if err := writeDirectoryMetadata(file, directory.Metadata); err != nil {
file.Close()
return err
}
return file.Close()
}
func writeDirectoryMetadata(file io.Writer,
directoryMetadata image.DirectoryMetadata) error {
w := bufio.NewWriter(file)
writer := fsutil.NewChecksumWriter(w)
if err := gob.NewEncoder(writer).Encode(directoryMetadata); err != nil {
return err
}
if err := writer.WriteChecksum(); err != nil {
return err
}
return w.Flush()
}
func (imdb *ImageDataBase) countDirectories() uint {
imdb.RLock()
defer imdb.RUnlock()
return uint(len(imdb.directoryMap))
}
func (imdb *ImageDataBase) countImages() uint {
imdb.RLock()
defer imdb.RUnlock()
return uint(len(imdb.imageMap))
}
func (imdb *ImageDataBase) deleteImage(name string,
authInfo *srpc.AuthInformation) error {
imdb.Lock()
defer imdb.Unlock()
if _, ok := imdb.imageMap[name]; ok {
if err := imdb.checkPermissions(name, authInfo); err != nil {
return err
}
filename := filepath.Join(imdb.baseDir, name)
if err := os.Truncate(filename, 0); err != nil {
return err
}
imdb.deleteImageAndUpdateUnreferencedObjectsList(name)
imdb.deleteNotifiers.sendPlain(name, "delete", imdb.logger)
return nil
} else {
return errors.New("image: " + name + " does not exist")
}
}
func (imdb *ImageDataBase) deleteImageAndUpdateUnreferencedObjectsList(
name string) {
img := imdb.imageMap[name]
if img == nil { // May be nil if expiring an already deleted image.
return
}
delete(imdb.imageMap, name)
imdb.rebuildDeDuper()
imdb.maybeAddToUnreferencedObjectsList(img.FileSystem)
}
func (imdb *ImageDataBase) deleteUnreferencedObjects(percentage uint8,
bytesThreshold uint64) error {
objects := imdb.listUnreferencedObjects()
objectsThreshold := uint64(percentage) * uint64(len(objects)) / 100
var objectsCount, bytesCount uint64
for hashVal, size := range objects {
if !(objectsCount < objectsThreshold || bytesCount < bytesThreshold) {
break
}
if err := imdb.objectServer.DeleteObject(hashVal); err != nil {
imdb.logger.Printf("Error cleaning up: %x: %s\n", hashVal, err)
return fmt.Errorf("error cleaning up: %x: %s\n", hashVal, err)
}
objectsCount++
bytesCount += size
}
return nil
}
func (imdb *ImageDataBase) doWithPendingImage(image *image.Image,
doFunc func() error) error {
imdb.pendingImageLock.Lock()
defer imdb.pendingImageLock.Unlock()
imdb.Lock()
changed := imdb.removeFromUnreferencedObjectsList(image)
imdb.Unlock()
err := doFunc()
imdb.Lock()
defer imdb.Unlock()
for _, img := range imdb.imageMap {
if img == image { // image was added, save if change happened above.
if changed {
imdb.saveUnreferencedObjectsList(false)
}
return err
}
}
// image was not added: "delete" it by maybe adding to unreferenced list.
imdb.maybeAddToUnreferencedObjectsList(image.FileSystem)
return err
}
func (imdb *ImageDataBase) findLatestImage(dirname string,
ignoreExpiring bool) (string, error) {
imdb.RLock()
defer imdb.RUnlock()
if _, ok := imdb.directoryMap[dirname]; !ok {
return "", errors.New("unknown directory: " + dirname)
}
var previousCreateTime time.Time
var imageName string
for name, img := range imdb.imageMap {
if ignoreExpiring && !img.ExpiresAt.IsZero() {
continue
}
if filepath.Dir(name) != dirname {
continue
}
if img.CreatedOn.After(previousCreateTime) {
imageName = name
previousCreateTime = img.CreatedOn
}
}
return imageName, nil
}
func (imdb *ImageDataBase) getImage(name string) *image.Image {
imdb.RLock()
defer imdb.RUnlock()
return imdb.imageMap[name]
}
func (imdb *ImageDataBase) getUnreferencedObjectsStatistics() (uint64, uint64) {
imdb.maybeRegenerateUnreferencedObjectsList()
imdb.RLock()
defer imdb.RUnlock()
return uint64(len(imdb.unreferencedObjects.hashToEntry)),
imdb.unreferencedObjects.totalBytes
}
func (imdb *ImageDataBase) listDirectories() []image.Directory {
imdb.RLock()
defer imdb.RUnlock()
directories := make([]image.Directory, 0, len(imdb.directoryMap))
for name, metadata := range imdb.directoryMap {
directories = append(directories,
image.Directory{Name: name, Metadata: metadata})
}
return directories
}
func (imdb *ImageDataBase) listImages() []string {
imdb.RLock()
defer imdb.RUnlock()
names := make([]string, 0)
for name := range imdb.imageMap {
names = append(names, name)
}
return names
}
func (imdb *ImageDataBase) listUnreferencedObjects() map[hash.Hash]uint64 {
imdb.maybeRegenerateUnreferencedObjectsList()
imdb.RLock()
defer imdb.RUnlock()
return imdb.unreferencedObjects.list()
}
func (imdb *ImageDataBase) makeDirectory(directory image.Directory,
authInfo *srpc.AuthInformation, userRpc bool) error {
directory.Name = filepath.Clean(directory.Name)
pathname := filepath.Join(imdb.baseDir, directory.Name)
imdb.Lock()
defer imdb.Unlock()
oldDirectoryMetadata, ok := imdb.directoryMap[directory.Name]
if userRpc {
if authInfo == nil {
return errNoAuthInfo
}
if ok {
return fmt.Errorf("directory: %s already exists", directory.Name)
}
directory.Metadata = oldDirectoryMetadata
parentMetadata, ok := imdb.directoryMap[filepath.Dir(directory.Name)]
if !ok {
return fmt.Errorf("no metadata for: %s",
filepath.Dir(directory.Name))
}
if !authInfo.HaveMethodAccess {
if parentMetadata.OwnerGroup == "" {
return errNoAccess
}
if _, ok := authInfo.GroupList[parentMetadata.OwnerGroup]; !ok {
return fmt.Errorf("no membership of %s group",
parentMetadata.OwnerGroup)
}
}
directory.Metadata.OwnerGroup = parentMetadata.OwnerGroup
}
if err := os.Mkdir(pathname, dirPerms); err != nil && !os.IsExist(err) {
return err
}
return imdb.updateDirectoryMetadata(directory)
}
// This must be called with the main lock held.
func (imdb *ImageDataBase) rebuildDeDuper() {
imdb.deduperLock.Lock()
defer imdb.deduperLock.Unlock()
startTime := time.Now()
imdb.deduper.Clear()
for _, image := range imdb.imageMap {
image.ReplaceStrings(imdb.deduper.DeDuplicate)
}
imdb.logger.Debugf(0, "Rebuilding de-duper state took %s\n",
time.Since(startTime))
}
func (imdb *ImageDataBase) registerAddNotifier() <-chan string {
channel := make(chan string, 1)
imdb.Lock()
defer imdb.Unlock()
imdb.addNotifiers[channel] = channel
return channel
}
func (imdb *ImageDataBase) registerDeleteNotifier() <-chan string {
channel := make(chan string, 1)
imdb.Lock()
defer imdb.Unlock()
imdb.deleteNotifiers[channel] = channel
return channel
}
func (imdb *ImageDataBase) registerMakeDirectoryNotifier() <-chan image.Directory {
channel := make(chan image.Directory, 1)
imdb.Lock()
defer imdb.Unlock()
imdb.mkdirNotifiers[channel] = channel
return channel
}
func (imdb *ImageDataBase) unregisterAddNotifier(channel <-chan string) {
imdb.Lock()
defer imdb.Unlock()
delete(imdb.addNotifiers, channel)
}
func (imdb *ImageDataBase) unregisterDeleteNotifier(channel <-chan string) {
imdb.Lock()
defer imdb.Unlock()
delete(imdb.deleteNotifiers, channel)
}
func (imdb *ImageDataBase) unregisterMakeDirectoryNotifier(
channel <-chan image.Directory) {
imdb.Lock()
defer imdb.Unlock()
delete(imdb.mkdirNotifiers, channel)
}
// This must be called with the lock held.
func (imdb *ImageDataBase) writeNewExpiration(name string,
oldImage *image.Image, expiresAt time.Time) error {
img := *oldImage
img.ExpiresAt = expiresAt
filename := filepath.Join(imdb.baseDir, name)
tmpFilename := filename + "~"
file, err := os.OpenFile(tmpFilename, os.O_CREATE|os.O_RDWR|os.O_EXCL,
filePerms)
if err != nil {
return err
}
defer file.Close()
defer os.Remove(tmpFilename)
w := bufio.NewWriter(file)
defer w.Flush()
writer := fsutil.NewChecksumWriter(w)
encoder := gob.NewEncoder(writer)
if err := encoder.Encode(img); err != nil {
return err
}
if err := writer.WriteChecksum(); err != nil {
return err
}
if err := w.Flush(); err != nil {
return err
}
fsutil.FsyncFile(file)
return os.Rename(tmpFilename, filename)
}
func (n notifiers) sendPlain(name string, operation string,
logger log.Logger) {
if len(n) < 1 {
return
} else {
plural := "s"
if len(n) < 2 {
plural = ""
}
logger.Printf("Sending %s notification to: %d listener%s\n",
operation, len(n), plural)
}
for _, sendChannel := range n {
go func(channel chan<- string) {
channel <- name
}(sendChannel)
}
}
func (n makeDirectoryNotifiers) sendMakeDirectory(dir image.Directory,
logger log.Logger) {
if len(n) < 1 {
return
} else {
plural := "s"
if len(n) < 2 {
plural = ""
}
logger.Printf("Sending mkdir notification to: %d listener%s\n",
len(n), plural)
}
for _, sendChannel := range n {
go func(channel chan<- image.Directory) {
channel <- dir
}(sendChannel)
}
}