package leveldb import ( "bytes" "context" "crypto/md5" "fmt" "io" "os" "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{}) } type LevelDB2Store struct { dbs []*leveldb.DB dbCount int } 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, 8) } func (store *LevelDB2Store) initialize(dir string, dbCount int) (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: 4, } for d := 0 ; d < dbCount; d++ { dbFolder := fmt.Sprintf("%s/%02d", dir, d) os.MkdirAll(dbFolder, 0755) db, dbErr := leveldb.OpenFile(dbFolder, opts) if dbErr != nil { glog.Errorf("filer store open dir %s: %v", dbFolder, dbErr) return } store.dbs = append(store.dbs, db) } store.dbCount = dbCount 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) { dir, name := entry.DirAndName() key, partitionId := genKey(dir, name, store.dbCount) value, err := entry.EncodeAttributesAndChunks() if err != nil { return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err) } err = store.dbs[partitionId].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) { dir, name := fullpath.DirAndName() key, partitionId := genKey(dir, name, store.dbCount) data, err := store.dbs[partitionId].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) { dir, name := fullpath.DirAndName() key, partitionId := genKey(dir, name, store.dbCount) err = store.dbs[partitionId].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, partitionId := genDirectoryKeyPrefix(fullpath, "", store.dbCount) lastFileStart, _ := genDirectoryKeyPrefix(fullpath, startFileName, store.dbCount) iter := store.dbs[partitionId].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 && !inclusive { continue } limit-- if limit < 0 { break } entry := &filer2.Entry{ FullPath: filer2.NewFullPath(string(fullpath), fileName), } // println("list", entry.FullPath, "chunks", len(entry.Chunks)) 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, dbCount int) (key []byte, partitionId int) { key, partitionId = hashToBytes(dirPath, dbCount) key = append(key, []byte(fileName)...) return key, partitionId } func genDirectoryKeyPrefix(fullpath filer2.FullPath, startFileName string, dbCount int) (keyPrefix []byte, partitionId int) { keyPrefix, partitionId = hashToBytes(string(fullpath), dbCount) if len(startFileName) > 0 { keyPrefix = append(keyPrefix, []byte(startFileName)...) } return keyPrefix, partitionId } func getNameFromKey(key []byte) string { return string(key[md5.Size:]) } // hash directory, and use last byte for partitioning func hashToBytes(dir string, dbCount int) ([]byte, int) { h := md5.New() io.WriteString(h, dir) b := h.Sum(nil) x := b[len(b)-1] return b, int(x)%dbCount }