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package leveldb
import ( "bytes" "context" "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"
"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 ( DIR_FILE_SEPARATOR = byte(0x00) )
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.Infof("filer store 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 { 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.Chunks) > 50 { 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.Chunks))
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", entry.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 *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, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int) (entries []*filer.Entry, err error) { return store.ListDirectoryPrefixedEntries(ctx, fullpath, startFileName, inclusive, limit, "") }
func (store *LevelDBStore) ListDirectoryPrefixedEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer.Entry, err error) {
directoryPrefix := genDirectoryKeyPrefix(fullpath, prefix) lastFileStart := directoryPrefix if startFileName != "" { lastFileStart = genDirectoryKeyPrefix(fullpath, 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 && !inclusive { continue } limit-- if limit < 0 { break } entry := &filer.Entry{ FullPath: weed_util.NewFullPath(string(fullpath), 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 } entries = append(entries, entry) } iter.Release()
return entries, 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() }
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