package leveldb import ( "bytes" "context" "fmt" "github.com/syndtr/goleveldb/leveldb" leveldb_errors "github.com/syndtr/goleveldb/leveldb/errors" "github.com/syndtr/goleveldb/leveldb/filter" "github.com/syndtr/goleveldb/leveldb/opt" leveldb_util "github.com/syndtr/goleveldb/leveldb/util" "io" "os" "github.com/seaweedfs/seaweedfs/weed/filer" "github.com/seaweedfs/seaweedfs/weed/glog" "github.com/seaweedfs/seaweedfs/weed/pb/filer_pb" weed_util "github.com/seaweedfs/seaweedfs/weed/util" ) const ( DIR_FILE_SEPARATOR = byte(0x00) ) var ( _ = filer.Debuggable(&LevelDBStore{}) ) func init() { filer.Stores = append(filer.Stores, &LevelDBStore{}) } type LevelDBStore struct { db *leveldb.DB } func (store *LevelDBStore) GetName() string { return "leveldb" } func (store *LevelDBStore) Initialize(configuration weed_util.Configuration, prefix string) (err error) { dir := configuration.GetString(prefix + "dir") return store.initialize(dir) } func (store *LevelDBStore) initialize(dir string) (err error) { glog.V(0).Infof("filer store dir: %s", dir) os.MkdirAll(dir, 0755) 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 Filter: filter.NewBloomFilter(8), // false positive rate 0.02 } if store.db, err = leveldb.OpenFile(dir, opts); err != nil { if leveldb_errors.IsCorrupted(err) { store.db, err = leveldb.RecoverFile(dir, opts) } if err != nil { glog.Infof("filer store open dir %s: %v", dir, err) return } } return } func (store *LevelDBStore) BeginTransaction(ctx context.Context) (context.Context, error) { return ctx, nil } func (store *LevelDBStore) CommitTransaction(ctx context.Context) error { return nil } func (store *LevelDBStore) RollbackTransaction(ctx context.Context) error { return nil } func (store *LevelDBStore) InsertEntry(ctx context.Context, entry *filer.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) } if len(entry.GetChunks()) > filer.CountEntryChunksForGzip { value = weed_util.MaybeGzipData(value) } 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.GetChunks())) return nil } func (store *LevelDBStore) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) { return store.InsertEntry(ctx, entry) } func (store *LevelDBStore) FindEntry(ctx context.Context, fullpath weed_util.FullPath) (entry *filer.Entry, err error) { key := genKey(fullpath.DirAndName()) data, err := store.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.GetChunks()), "data", len(data), string(data)) return entry, nil } func (store *LevelDBStore) DeleteEntry(ctx context.Context, fullpath weed_util.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 *LevelDBStore) DeleteFolderChildren(ctx context.Context, fullpath weed_util.FullPath) (err error) { batch := new(leveldb.Batch) directoryPrefix := genDirectoryKeyPrefix(fullpath, "") iter := store.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([]byte(genKey(string(fullpath), fileName))) } iter.Release() err = store.db.Write(batch, nil) if err != nil { return fmt.Errorf("delete %s : %v", fullpath, err) } return nil } func (store *LevelDBStore) 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 *LevelDBStore) ListDirectoryPrefixedEntries(ctx context.Context, dirPath weed_util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) { directoryPrefix := genDirectoryKeyPrefix(dirPath, prefix) lastFileStart := directoryPrefix if startFileName != "" { lastFileStart = genDirectoryKeyPrefix(dirPath, startFileName) } iter := store.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 } limit-- if limit < 0 { break } lastFileName = fileName entry := &filer.Entry{ FullPath: weed_util.NewFullPath(string(dirPath), fileName), } 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 = []byte(dirPath) key = append(key, DIR_FILE_SEPARATOR) key = append(key, []byte(fileName)...) return key } func genDirectoryKeyPrefix(fullpath weed_util.FullPath, startFileName string) (keyPrefix []byte) { keyPrefix = []byte(string(fullpath)) keyPrefix = append(keyPrefix, DIR_FILE_SEPARATOR) if len(startFileName) > 0 { keyPrefix = append(keyPrefix, []byte(startFileName)...) } return keyPrefix } func getNameFromKey(key []byte) string { sepIndex := len(key) - 1 for sepIndex >= 0 && key[sepIndex] != DIR_FILE_SEPARATOR { sepIndex-- } return string(key[sepIndex+1:]) } func (store *LevelDBStore) Shutdown() { store.db.Close() } func (store *LevelDBStore) Debug(writer io.Writer) { iter := store.db.NewIterator(&leveldb_util.Range{}, nil) for iter.Next() { key := iter.Key() fullName := bytes.Replace(key, []byte{DIR_FILE_SEPARATOR}, []byte{' '}, 1) fmt.Fprintf(writer, "%v\n", string(fullName)) } iter.Release() }