/
load.go
218 lines (211 loc) · 6.35 KB
/
load.go
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package scanner
import (
"encoding/gob"
"errors"
"fmt"
"io"
"os"
"path"
"strings"
"syscall"
"time"
"github.com/Cloud-Foundations/Dominator/lib/concurrent"
"github.com/Cloud-Foundations/Dominator/lib/fsutil"
"github.com/Cloud-Foundations/Dominator/lib/image"
"github.com/Cloud-Foundations/Dominator/lib/log"
"github.com/Cloud-Foundations/Dominator/lib/log/logutil"
"github.com/Cloud-Foundations/Dominator/lib/log/prefixlogger"
"github.com/Cloud-Foundations/Dominator/lib/objectserver"
objectclient "github.com/Cloud-Foundations/Dominator/lib/objectserver/client"
"github.com/Cloud-Foundations/Dominator/lib/srpc"
"github.com/Cloud-Foundations/Dominator/lib/stringutil"
)
func loadImageDataBase(baseDir string, objSrv objectserver.FullObjectServer,
replicationMaster string, logger log.DebugLogger) (*ImageDataBase, error) {
fi, err := os.Stat(baseDir)
if err != nil {
return nil, fmt.Errorf("cannot stat: %s: %s\n", baseDir, err)
}
if !fi.IsDir() {
return nil, fmt.Errorf("%s is not a directory\n", baseDir)
}
imdb := &ImageDataBase{
baseDir: baseDir,
directoryMap: make(map[string]image.DirectoryMetadata),
imageMap: make(map[string]*image.Image),
addNotifiers: make(notifiers),
deleteNotifiers: make(notifiers),
mkdirNotifiers: make(makeDirectoryNotifiers),
deduper: stringutil.NewStringDeduplicator(false),
objectServer: objSrv,
replicationMaster: replicationMaster,
logger: logger,
}
imdb.unreferencedObjects, err = loadUnreferencedObjects(
path.Join(baseDir, unreferencedObjectsFile))
if err != nil {
return nil, errors.New("error loading unreferenced objects list: " +
err.Error())
}
state := concurrent.NewState(0)
startTime := time.Now()
var rusageStart, rusageStop syscall.Rusage
syscall.Getrusage(syscall.RUSAGE_SELF, &rusageStart)
if err := imdb.scanDirectory(".", state, logger); err != nil {
return nil, err
}
if err := state.Reap(); err != nil {
return nil, err
}
if logger != nil {
plural := ""
if imdb.CountImages() != 1 {
plural = "s"
}
syscall.Getrusage(syscall.RUSAGE_SELF, &rusageStop)
userTime := time.Duration(rusageStop.Utime.Sec)*time.Second +
time.Duration(rusageStop.Utime.Usec)*time.Microsecond -
time.Duration(rusageStart.Utime.Sec)*time.Second -
time.Duration(rusageStart.Utime.Usec)*time.Microsecond
logger.Printf("Loaded %d image%s in %s (%s user CPUtime)\n",
imdb.CountImages(), plural, time.Since(startTime), userTime)
logutil.LogMemory(logger, 0, "after loading")
}
imdb.regenerateUnreferencedObjectsList()
if ads, ok := objSrv.(objectserver.AddCallbackSetter); ok {
ads.SetAddCallback(imdb.garbageCollectorAddCallback)
}
if gcs, ok := objSrv.(objectserver.GarbageCollectorSetter); ok {
gcs.SetGarbageCollector(imdb.garbageCollector)
}
go imdb.periodicGarbageCollector()
return imdb, nil
}
func (imdb *ImageDataBase) scanDirectory(dirname string,
state *concurrent.State, logger log.DebugLogger) error {
directoryMetadata, err := imdb.readDirectoryMetadata(dirname)
if err != nil {
return err
}
imdb.directoryMap[dirname] = directoryMetadata
file, err := os.Open(path.Join(imdb.baseDir, dirname))
if err != nil {
return err
}
names, err := file.Readdirnames(-1)
file.Close()
if err != nil {
return err
}
for _, name := range names {
if len(name) > 0 && name[0] == '.' {
continue // Skip hidden paths.
}
filename := path.Join(dirname, name)
var stat syscall.Stat_t
err := syscall.Lstat(path.Join(imdb.baseDir, filename), &stat)
if err != nil {
if err == syscall.ENOENT {
continue
}
return err
}
if stat.Mode&syscall.S_IFMT == syscall.S_IFDIR {
err = imdb.scanDirectory(filename, state, logger)
} else if stat.Mode&syscall.S_IFMT == syscall.S_IFREG && stat.Size > 0 {
err = state.GoRun(func() error {
return imdb.loadFile(filename, logger)
})
}
if err != nil {
if err == syscall.ENOENT {
continue
}
return err
}
}
return nil
}
func (imdb *ImageDataBase) readDirectoryMetadata(dirname string) (
image.DirectoryMetadata, error) {
file, err := os.Open(path.Join(imdb.baseDir, dirname, metadataFile))
if err != nil {
if os.IsNotExist(err) {
return image.DirectoryMetadata{}, nil
}
return image.DirectoryMetadata{}, err
}
defer file.Close()
reader := fsutil.NewChecksumReader(file)
decoder := gob.NewDecoder(reader)
metadata := image.DirectoryMetadata{}
if err := decoder.Decode(&metadata); err != nil {
return image.DirectoryMetadata{}, fmt.Errorf(
"unable to read directory metadata for \"%s\": %s", dirname, err)
}
return metadata, reader.VerifyChecksum()
}
func (imdb *ImageDataBase) loadFile(filename string,
logger log.DebugLogger) error {
pathname := path.Join(imdb.baseDir, filename)
file, err := os.Open(pathname)
if err != nil {
return err
}
defer file.Close()
reader := fsutil.NewChecksumReader(file)
decoder := gob.NewDecoder(reader)
var img image.Image
if err := decoder.Decode(&img); err != nil {
return err
}
if err := reader.VerifyChecksum(); err != nil {
if err == fsutil.ErrorChecksumMismatch {
logger.Printf("Checksum mismatch for image: %s\n", filename)
return nil
}
if err != io.EOF {
return err
}
}
if imageIsExpired(&img) {
imdb.logger.Printf("Deleting already expired image: %s\n", filename)
return os.Remove(pathname)
}
if err := img.VerifyObjects(imdb.objectServer); err != nil {
if imdb.replicationMaster == "" ||
!strings.Contains(err.Error(), "not available") {
return fmt.Errorf("error verifying: %s: %s", filename, err)
}
err = imdb.fetchMissingObjects(&img,
prefixlogger.New(filename+": ", logger))
if err != nil {
return err
}
}
img.FileSystem.RebuildInodePointers()
imdb.deduperLock.Lock()
img.ReplaceStrings(imdb.deduper.DeDuplicate)
imdb.deduperLock.Unlock()
if err := img.Verify(); err != nil {
return err
}
imdb.scheduleExpiration(&img, filename)
imdb.Lock()
defer imdb.Unlock()
imdb.imageMap[filename] = &img
return nil
}
func (imdb *ImageDataBase) fetchMissingObjects(img *image.Image,
logger log.DebugLogger) error {
imdb.objectFetchLock.Lock()
defer imdb.objectFetchLock.Unlock()
client, err := srpc.DialHTTP("tcp", imdb.replicationMaster, time.Minute)
if err != nil {
return err
}
defer client.Close()
objClient := objectclient.AttachObjectClient(client)
defer objClient.Close()
return img.GetMissingObjects(imdb.objectServer, objClient, logger)
}