mirror of
https://github.com/seaweedfs/seaweedfs.git
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280 lines
7.2 KiB
Go
280 lines
7.2 KiB
Go
package leveldb
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import (
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"bytes"
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"context"
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"crypto/md5"
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"fmt"
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"io"
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"os"
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"strings"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/errors"
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"github.com/syndtr/goleveldb/leveldb/opt"
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leveldb_util "github.com/syndtr/goleveldb/leveldb/util"
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"github.com/chrislusf/seaweedfs/weed/filer2"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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weed_util "github.com/chrislusf/seaweedfs/weed/util"
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)
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func init() {
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filer2.Stores = append(filer2.Stores, &LevelDB2Store{})
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}
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type LevelDB2Store struct {
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dbs []*leveldb.DB
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dbCount int
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}
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func (store *LevelDB2Store) GetName() string {
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return "leveldb2"
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}
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func (store *LevelDB2Store) Initialize(configuration weed_util.Configuration, prefix string) (err error) {
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dir := configuration.GetString(prefix + "dir")
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return store.initialize(dir, 8)
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}
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func (store *LevelDB2Store) initialize(dir string, dbCount int) (err error) {
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glog.Infof("filer store leveldb2 dir: %s", dir)
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if err := weed_util.TestFolderWritable(dir); err != nil {
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return fmt.Errorf("Check Level Folder %s Writable: %s", dir, err)
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}
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opts := &opt.Options{
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BlockCacheCapacity: 32 * 1024 * 1024, // default value is 8MiB
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WriteBuffer: 16 * 1024 * 1024, // default value is 4MiB
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CompactionTableSizeMultiplier: 4,
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}
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for d := 0; d < dbCount; d++ {
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dbFolder := fmt.Sprintf("%s/%02d", dir, d)
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os.MkdirAll(dbFolder, 0755)
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db, dbErr := leveldb.OpenFile(dbFolder, opts)
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if errors.IsCorrupted(dbErr) {
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db, dbErr = leveldb.RecoverFile(dbFolder, opts)
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}
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if dbErr != nil {
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glog.Errorf("filer store open dir %s: %v", dbFolder, dbErr)
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return dbErr
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}
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store.dbs = append(store.dbs, db)
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}
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store.dbCount = dbCount
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return
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}
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func (store *LevelDB2Store) BeginTransaction(ctx context.Context) (context.Context, error) {
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return ctx, nil
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}
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func (store *LevelDB2Store) CommitTransaction(ctx context.Context) error {
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return nil
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}
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func (store *LevelDB2Store) RollbackTransaction(ctx context.Context) error {
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return nil
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}
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func (store *LevelDB2Store) InsertEntry(ctx context.Context, entry *filer2.Entry) (err error) {
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dir, name := entry.DirAndName()
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key, partitionId := genKey(dir, name, store.dbCount)
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value, err := entry.EncodeAttributesAndChunks()
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if err != nil {
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return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
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}
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err = store.dbs[partitionId].Put(key, value, nil)
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if err != nil {
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return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
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}
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// println("saved", entry.FullPath, "chunks", len(entry.Chunks))
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return nil
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}
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func (store *LevelDB2Store) UpdateEntry(ctx context.Context, entry *filer2.Entry) (err error) {
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return store.InsertEntry(ctx, entry)
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}
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func (store *LevelDB2Store) FindEntry(ctx context.Context, fullpath weed_util.FullPath) (entry *filer2.Entry, err error) {
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dir, name := fullpath.DirAndName()
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key, partitionId := genKey(dir, name, store.dbCount)
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data, err := store.dbs[partitionId].Get(key, nil)
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if err == leveldb.ErrNotFound {
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return nil, filer_pb.ErrNotFound
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}
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if err != nil {
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return nil, fmt.Errorf("get %s : %v", entry.FullPath, err)
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}
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entry = &filer2.Entry{
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FullPath: fullpath,
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}
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err = entry.DecodeAttributesAndChunks(data)
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if err != nil {
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return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
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}
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// println("read", entry.FullPath, "chunks", len(entry.Chunks), "data", len(data), string(data))
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return entry, nil
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}
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func (store *LevelDB2Store) DeleteEntry(ctx context.Context, fullpath weed_util.FullPath) (err error) {
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dir, name := fullpath.DirAndName()
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key, partitionId := genKey(dir, name, store.dbCount)
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err = store.dbs[partitionId].Delete(key, nil)
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if err != nil {
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return fmt.Errorf("delete %s : %v", fullpath, err)
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}
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return nil
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}
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func (store *LevelDB2Store) DeleteFolderChildren(ctx context.Context, fullpath weed_util.FullPath) (err error) {
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directoryPrefix, partitionId := genDirectoryKeyPrefix(fullpath, "", store.dbCount)
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batch := new(leveldb.Batch)
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iter := store.dbs[partitionId].NewIterator(&leveldb_util.Range{Start: directoryPrefix}, nil)
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for iter.Next() {
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key := iter.Key()
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if !bytes.HasPrefix(key, directoryPrefix) {
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break
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}
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fileName := getNameFromKey(key)
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if fileName == "" {
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continue
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}
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batch.Delete(append(directoryPrefix, []byte(fileName)...))
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}
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iter.Release()
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err = store.dbs[partitionId].Write(batch, nil)
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if err != nil {
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return fmt.Errorf("delete %s : %v", fullpath, err)
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}
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return nil
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}
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func (store *LevelDB2Store) ListDirectoryPrefixedEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer2.Entry, err error) {
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count := 0
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notPrefixed, err := store.ListDirectoryEntries(ctx, fullpath, startFileName, inclusive, limit)
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if err != nil {
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return nil, err
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}
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if prefix == "" {
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return notPrefixed, nil
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}
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for count < limit {
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for _, entry := range notPrefixed {
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if strings.HasPrefix(entry.Name(), prefix) {
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count++
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entries = append(entries, entry)
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}
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}
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if count >= limit {
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break
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}
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notPrefixed, err = store.ListDirectoryEntries(ctx, fullpath, startFileName, inclusive, limit)
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if err != nil {
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return nil, err
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}
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}
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return entries, nil
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}
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func (store *LevelDB2Store) ListDirectoryEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool,
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limit int) (entries []*filer2.Entry, err error) {
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directoryPrefix, partitionId := genDirectoryKeyPrefix(fullpath, "", store.dbCount)
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lastFileStart, _ := genDirectoryKeyPrefix(fullpath, startFileName, store.dbCount)
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iter := store.dbs[partitionId].NewIterator(&leveldb_util.Range{Start: lastFileStart}, nil)
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for iter.Next() {
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key := iter.Key()
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if !bytes.HasPrefix(key, directoryPrefix) {
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break
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}
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fileName := getNameFromKey(key)
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if fileName == "" {
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continue
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}
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if fileName == startFileName && !inclusive {
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continue
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}
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limit--
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if limit < 0 {
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break
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}
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entry := &filer2.Entry{
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FullPath: weed_util.NewFullPath(string(fullpath), fileName),
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}
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// println("list", entry.FullPath, "chunks", len(entry.Chunks))
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if decodeErr := entry.DecodeAttributesAndChunks(iter.Value()); decodeErr != nil {
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err = decodeErr
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glog.V(0).Infof("list %s : %v", entry.FullPath, err)
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break
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}
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entries = append(entries, entry)
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}
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iter.Release()
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return entries, err
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}
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func genKey(dirPath, fileName string, dbCount int) (key []byte, partitionId int) {
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key, partitionId = hashToBytes(dirPath, dbCount)
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key = append(key, []byte(fileName)...)
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return key, partitionId
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}
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func genDirectoryKeyPrefix(fullpath weed_util.FullPath, startFileName string, dbCount int) (keyPrefix []byte, partitionId int) {
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keyPrefix, partitionId = hashToBytes(string(fullpath), dbCount)
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if len(startFileName) > 0 {
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keyPrefix = append(keyPrefix, []byte(startFileName)...)
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}
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return keyPrefix, partitionId
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}
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func getNameFromKey(key []byte) string {
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return string(key[md5.Size:])
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}
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// hash directory, and use last byte for partitioning
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func hashToBytes(dir string, dbCount int) ([]byte, int) {
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h := md5.New()
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io.WriteString(h, dir)
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b := h.Sum(nil)
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x := b[len(b)-1]
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return b, int(x) % dbCount
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}
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func (store *LevelDB2Store) Shutdown() {
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for d := 0; d < store.dbCount; d++ {
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store.dbs[d].Close()
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}
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}
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