package leveldb import ( "bytes" "context" "crypto/md5" "fmt" "io" "github.com/chrislusf/seaweedfs/weed/filer2" "github.com/chrislusf/seaweedfs/weed/glog" weed_util "github.com/chrislusf/seaweedfs/weed/util" "github.com/syndtr/goleveldb/leveldb" "github.com/syndtr/goleveldb/leveldb/opt" leveldb_util "github.com/syndtr/goleveldb/leveldb/util" ) func init() { filer2.Stores = append(filer2.Stores, &LevelDB2Store{}) } // known theoretically 128 bit MD5 collision of 2 directories. // (but really? please show some real examples) type LevelDB2Store struct { db *leveldb.DB } func (store *LevelDB2Store) GetName() string { return "leveldb2" } func (store *LevelDB2Store) Initialize(configuration weed_util.Configuration) (err error) { dir := configuration.GetString("dir") return store.initialize(dir) } func (store *LevelDB2Store) initialize(dir string) (err error) { glog.Infof("filer store leveldb2 dir: %s", dir) if err := weed_util.TestFolderWritable(dir); err != nil { return fmt.Errorf("Check Level Folder %s Writable: %s", dir, err) } opts := &opt.Options{ BlockCacheCapacity: 32 * 1024 * 1024, // default value is 8MiB WriteBuffer: 16 * 1024 * 1024, // default value is 4MiB CompactionTableSizeMultiplier: 10, } if store.db, err = leveldb.OpenFile(dir, opts); err != nil { glog.Infof("filer store open dir %s: %v", dir, err) return } return } func (store *LevelDB2Store) BeginTransaction(ctx context.Context) (context.Context, error) { return ctx, nil } func (store *LevelDB2Store) CommitTransaction(ctx context.Context) error { return nil } func (store *LevelDB2Store) RollbackTransaction(ctx context.Context) error { return nil } func (store *LevelDB2Store) InsertEntry(ctx context.Context, entry *filer2.Entry) (err error) { key := genKey(entry.DirAndName()) value, err := entry.EncodeAttributesAndChunks() if err != nil { return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err) } err = store.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 *LevelDB2Store) UpdateEntry(ctx context.Context, entry *filer2.Entry) (err error) { return store.InsertEntry(ctx, entry) } func (store *LevelDB2Store) FindEntry(ctx context.Context, fullpath filer2.FullPath) (entry *filer2.Entry, err error) { key := genKey(fullpath.DirAndName()) data, err := store.db.Get(key, nil) if err == leveldb.ErrNotFound { return nil, filer2.ErrNotFound } if err != nil { return nil, fmt.Errorf("get %s : %v", entry.FullPath, err) } entry = &filer2.Entry{ FullPath: fullpath, } err = entry.DecodeAttributesAndChunks(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 *LevelDB2Store) DeleteEntry(ctx context.Context, fullpath filer2.FullPath) (err error) { key := genKey(fullpath.DirAndName()) err = store.db.Delete(key, nil) if err != nil { return fmt.Errorf("delete %s : %v", fullpath, err) } return nil } func (store *LevelDB2Store) ListDirectoryEntries(ctx context.Context, fullpath filer2.FullPath, startFileName string, inclusive bool, limit int) (entries []*filer2.Entry, err error) { directoryPrefix := genDirectoryKeyPrefix(fullpath, "") iter := store.db.NewIterator(&leveldb_util.Range{Start: genDirectoryKeyPrefix(fullpath, startFileName)}, nil) for iter.Next() { key := iter.Key() if !bytes.HasPrefix(key, directoryPrefix) { break } fileName := getNameFromKey(key) if fileName == "" { continue } if fileName == startFileName && !inclusive { continue } limit-- if limit < 0 { break } entry := &filer2.Entry{ FullPath: filer2.NewFullPath(string(fullpath), fileName), } if decodeErr := entry.DecodeAttributesAndChunks(iter.Value()); decodeErr != nil { err = decodeErr glog.V(0).Infof("list %s : %v", entry.FullPath, err) break } entries = append(entries, entry) } iter.Release() return entries, err } func genKey(dirPath, fileName string) (key []byte) { key = hashToBytes(dirPath) key = append(key, []byte(fileName)...) return key } func genDirectoryKeyPrefix(fullpath filer2.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[8:]) } func hashToBytes(dir string) []byte { h := md5.New() io.WriteString(h, dir) b := h.Sum(nil) return b }