1 files changed, 375 insertions, 0 deletions
diff --git a/weed/filer/leveldb3/leveldb3_store.go b/weed/filer/leveldb3/leveldb3_store.go
new file mode 100644
index 000000000..24e00edc7
--- /dev/null
+++ b/weed/filer/leveldb3/leveldb3_store.go
@@ -0,0 +1,375 @@
+package leveldb
+
+import (
+	"bytes"
+	"context"
+	"crypto/md5"
+	"fmt"
+	"github.com/syndtr/goleveldb/leveldb"
+	leveldb_errors "github.com/syndtr/goleveldb/leveldb/errors"
+	"github.com/syndtr/goleveldb/leveldb/opt"
+	leveldb_util "github.com/syndtr/goleveldb/leveldb/util"
+	"io"
+	"os"
+	"strings"
+	"sync"
+
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	weed_util "github.com/chrislusf/seaweedfs/weed/util"
+)
+
+const (
+	DEFAULT = "_main"
+)
+
+func init() {
+	filer.Stores = append(filer.Stores, &LevelDB3Store{})
+}
+
+type LevelDB3Store struct {
+	dir     string
+	dbs     map[string]*leveldb.DB
+	dbsLock sync.RWMutex
+}
+
+func (store *LevelDB3Store) GetName() string {
+	return "leveldb3"
+}
+
+func (store *LevelDB3Store) Initialize(configuration weed_util.Configuration, prefix string) (err error) {
+	dir := configuration.GetString(prefix + "dir")
+	return store.initialize(dir)
+}
+
+func (store *LevelDB3Store) initialize(dir string) (err error) {
+	glog.Infof("filer store leveldb3 dir: %s", dir)
+	if err := weed_util.TestFolderWritable(dir); err != nil {
+		return fmt.Errorf("Check Level Folder %s Writable: %s", dir, err)
+	}
+	store.dir = dir
+
+	db, loadDbErr := store.loadDB(DEFAULT)
+	if loadDbErr != nil {
+		return loadDbErr
+	}
+	store.dbs = make(map[string]*leveldb.DB)
+	store.dbs[DEFAULT] = db
+
+	return
+}
+
+func (store *LevelDB3Store) loadDB(name string) (*leveldb.DB, error) {
+
+	opts := &opt.Options{
+		BlockCacheCapacity:            32 * 1024 * 1024, // default value is 8MiB
+		WriteBuffer:                   16 * 1024 * 1024, // default value is 4MiB
+		CompactionTableSizeMultiplier: 4,
+	}
+	if name != DEFAULT {
+		opts = &opt.Options{
+			BlockCacheCapacity:            4 * 1024 * 1024, // default value is 8MiB
+			WriteBuffer:                   2 * 1024 * 1024, // default value is 4MiB
+			CompactionTableSizeMultiplier: 4,
+		}
+	}
+
+	dbFolder := fmt.Sprintf("%s/%s", store.dir, name)
+	os.MkdirAll(dbFolder, 0755)
+	db, dbErr := leveldb.OpenFile(dbFolder, opts)
+	if leveldb_errors.IsCorrupted(dbErr) {
+		db, dbErr = leveldb.RecoverFile(dbFolder, opts)
+	}
+	if dbErr != nil {
+		glog.Errorf("filer store open dir %s: %v", dbFolder, dbErr)
+		return nil, dbErr
+	}
+	return db, nil
+}
+
+func (store *LevelDB3Store) findDB(fullpath weed_util.FullPath, isForChildren bool) (*leveldb.DB, string, weed_util.FullPath, error) {
+
+	store.dbsLock.RLock()
+
+	defaultDB := store.dbs[DEFAULT]
+	if !strings.HasPrefix(string(fullpath), "/buckets/") {
+		store.dbsLock.RUnlock()
+		return defaultDB, DEFAULT, fullpath, nil
+	}
+
+	// detect bucket
+	bucketAndObjectKey := string(fullpath)[len("/buckets/"):]
+	t := strings.Index(bucketAndObjectKey, "/")
+	if t < 0 && !isForChildren {
+		store.dbsLock.RUnlock()
+		return defaultDB, DEFAULT, fullpath, nil
+	}
+	bucket := bucketAndObjectKey
+	shortPath := weed_util.FullPath("/")
+	if t > 0 {
+		bucket = bucketAndObjectKey[:t]
+		shortPath = weed_util.FullPath(bucketAndObjectKey[t:])
+	}
+
+	if db, found := store.dbs[bucket]; found {
+		store.dbsLock.RUnlock()
+		return db, bucket, shortPath, nil
+	}
+
+	store.dbsLock.RUnlock()
+	// upgrade to write lock
+	store.dbsLock.Lock()
+	defer store.dbsLock.Unlock()
+
+	// double check after getting the write lock
+	if db, found := store.dbs[bucket]; found {
+		return db, bucket, shortPath, nil
+	}
+
+	// create db
+	db, err := store.loadDB(bucket)
+	if err != nil {
+		return nil, bucket, shortPath, err
+	}
+	store.dbs[bucket] = db
+
+	return db, bucket, shortPath, nil
+}
+
+func (store *LevelDB3Store) closeDB(bucket string) {
+
+	store.dbsLock.Lock()
+	defer store.dbsLock.Unlock()
+
+	if db, found := store.dbs[bucket]; found {
+		db.Close()
+		delete(store.dbs, bucket)
+	}
+
+}
+
+func (store *LevelDB3Store) BeginTransaction(ctx context.Context) (context.Context, error) {
+	return ctx, nil
+}
+func (store *LevelDB3Store) CommitTransaction(ctx context.Context) error {
+	return nil
+}
+func (store *LevelDB3Store) RollbackTransaction(ctx context.Context) error {
+	return nil
+}
+
+func (store *LevelDB3Store) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
+
+	db, _, shortPath, err := store.findDB(entry.FullPath, false)
+	if err != nil {
+		return fmt.Errorf("findDB %s : %v", entry.FullPath, err)
+	}
+
+	dir, name := shortPath.DirAndName()
+	key := genKey(dir, name)
+
+	value, err := entry.EncodeAttributesAndChunks()
+	if err != nil {
+		return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
+	}
+
+	if len(entry.Chunks) > 50 {
+		value = weed_util.MaybeGzipData(value)
+	}
+
+	err = db.Put(key, value, nil)
+
+	if err != nil {
+		return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
+	}
+
+	// println("saved", entry.FullPath, "chunks", len(entry.Chunks))
+
+	return nil
+}
+
+func (store *LevelDB3Store) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
+
+	return store.InsertEntry(ctx, entry)
+}
+
+func (store *LevelDB3Store) FindEntry(ctx context.Context, fullpath weed_util.FullPath) (entry *filer.Entry, err error) {
+
+	db, _, shortPath, err := store.findDB(fullpath, false)
+	if err != nil {
+		return nil, fmt.Errorf("findDB %s : %v", fullpath, err)
+	}
+
+	dir, name := shortPath.DirAndName()
+	key := genKey(dir, name)
+
+	data, err := db.Get(key, nil)
+
+	if err == leveldb.ErrNotFound {
+		return nil, filer_pb.ErrNotFound
+	}
+	if err != nil {
+		return nil, fmt.Errorf("get %s : %v", fullpath, err)
+	}
+
+	entry = &filer.Entry{
+		FullPath: fullpath,
+	}
+	err = entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(data))
+	if err != nil {
+		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
+	}
+
+	// println("read", entry.FullPath, "chunks", len(entry.Chunks), "data", len(data), string(data))
+
+	return entry, nil
+}
+
+func (store *LevelDB3Store) DeleteEntry(ctx context.Context, fullpath weed_util.FullPath) (err error) {
+
+	db, _, shortPath, err := store.findDB(fullpath, false)
+	if err != nil {
+		return fmt.Errorf("findDB %s : %v", fullpath, err)
+	}
+
+	dir, name := shortPath.DirAndName()
+	key := genKey(dir, name)
+
+	err = db.Delete(key, nil)
+	if err != nil {
+		return fmt.Errorf("delete %s : %v", fullpath, err)
+	}
+
+	return nil
+}
+
+func (store *LevelDB3Store) DeleteFolderChildren(ctx context.Context, fullpath weed_util.FullPath) (err error) {
+
+	db, bucket, shortPath, err := store.findDB(fullpath, true)
+	if err != nil {
+		return fmt.Errorf("findDB %s : %v", fullpath, err)
+	}
+
+	if bucket != DEFAULT && shortPath == "/" {
+		store.closeDB(bucket)
+		if bucket != "" { // just to make sure
+			os.RemoveAll(store.dir + "/" + bucket)
+		}
+		return nil
+	}
+
+	directoryPrefix := genDirectoryKeyPrefix(shortPath, "")
+
+	batch := new(leveldb.Batch)
+
+	iter := db.NewIterator(&leveldb_util.Range{Start: directoryPrefix}, nil)
+	for iter.Next() {
+		key := iter.Key()
+		if !bytes.HasPrefix(key, directoryPrefix) {
+			break
+		}
+		fileName := getNameFromKey(key)
+		if fileName == "" {
+			continue
+		}
+		batch.Delete(append(directoryPrefix, []byte(fileName)...))
+	}
+	iter.Release()
+
+	err = db.Write(batch, nil)
+
+	if err != nil {
+		return fmt.Errorf("delete %s : %v", fullpath, err)
+	}
+
+	return nil
+}
+
+func (store *LevelDB3Store) ListDirectoryEntries(ctx context.Context, dirPath weed_util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
+	return store.ListDirectoryPrefixedEntries(ctx, dirPath, startFileName, includeStartFile, limit, "", eachEntryFunc)
+}
+
+func (store *LevelDB3Store) ListDirectoryPrefixedEntries(ctx context.Context, dirPath weed_util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
+
+	db, _, shortPath, err := store.findDB(dirPath, true)
+	if err != nil {
+		return lastFileName, fmt.Errorf("findDB %s : %v", dirPath, err)
+	}
+
+	directoryPrefix := genDirectoryKeyPrefix(shortPath, prefix)
+	lastFileStart := directoryPrefix
+	if startFileName != "" {
+		lastFileStart = genDirectoryKeyPrefix(shortPath, startFileName)
+	}
+
+	iter := db.NewIterator(&leveldb_util.Range{Start: lastFileStart}, nil)
+	for iter.Next() {
+		key := iter.Key()
+		if !bytes.HasPrefix(key, directoryPrefix) {
+			break
+		}
+		fileName := getNameFromKey(key)
+		if fileName == "" {
+			continue
+		}
+		if fileName == startFileName && !includeStartFile {
+			continue
+		}
+		lastFileName = fileName
+		limit--
+		if limit < 0 {
+			break
+		}
+		entry := &filer.Entry{
+			FullPath: weed_util.NewFullPath(string(dirPath), fileName),
+		}
+
+		// println("list", entry.FullPath, "chunks", len(entry.Chunks))
+		if decodeErr := entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(iter.Value())); decodeErr != nil {
+			err = decodeErr
+			glog.V(0).Infof("list %s : %v", entry.FullPath, err)
+			break
+		}
+		if !eachEntryFunc(entry) {
+			break
+		}
+	}
+	iter.Release()
+
+	return lastFileName, err
+}
+
+func genKey(dirPath, fileName string) (key []byte) {
+	key = hashToBytes(dirPath)
+	key = append(key, []byte(fileName)...)
+	return key
+}
+
+func genDirectoryKeyPrefix(fullpath weed_util.FullPath, startFileName string) (keyPrefix []byte) {
+	keyPrefix = hashToBytes(string(fullpath))
+	if len(startFileName) > 0 {
+		keyPrefix = append(keyPrefix, []byte(startFileName)...)
+	}
+	return keyPrefix
+}
+
+func getNameFromKey(key []byte) string {
+
+	return string(key[md5.Size:])
+
+}
+
+// hash directory
+func hashToBytes(dir string) []byte {
+	h := md5.New()
+	io.WriteString(h, dir)
+	b := h.Sum(nil)
+	return b
+}
+
+func (store *LevelDB3Store) Shutdown() {
+	for _, db := range store.dbs {
+		db.Close()
+	}
+}