mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-05-13 23:11:54 +02:00
387 lines
9.4 KiB
Go
387 lines
9.4 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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"sync"
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"github.com/syndtr/goleveldb/leveldb"
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leveldb_errors "github.com/syndtr/goleveldb/leveldb/errors"
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"github.com/syndtr/goleveldb/leveldb/filter"
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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/seaweedfs/seaweedfs/weed/filer"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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weed_util "github.com/seaweedfs/seaweedfs/weed/util"
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)
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const (
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DEFAULT = "_main"
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)
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func init() {
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filer.Stores = append(filer.Stores, &LevelDB3Store{})
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}
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type LevelDB3Store struct {
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dir string
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dbs map[string]*leveldb.DB
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dbsLock sync.RWMutex
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}
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func (store *LevelDB3Store) GetName() string {
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return "leveldb3"
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}
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func (store *LevelDB3Store) 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)
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}
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func (store *LevelDB3Store) initialize(dir string) (err error) {
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glog.Infof("filer store leveldb3 dir: %s", dir)
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os.MkdirAll(dir, 0755)
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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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store.dir = dir
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db, loadDbErr := store.loadDB(DEFAULT)
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if loadDbErr != nil {
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return loadDbErr
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}
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store.dbs = make(map[string]*leveldb.DB)
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store.dbs[DEFAULT] = db
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return
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}
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func (store *LevelDB3Store) loadDB(name string) (*leveldb.DB, error) {
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bloom := filter.NewBloomFilter(8) // false positive rate 0.02
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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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Filter: bloom,
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}
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if name != DEFAULT {
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opts = &opt.Options{
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BlockCacheCapacity: 16 * 1024 * 1024, // default value is 8MiB
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WriteBuffer: 8 * 1024 * 1024, // default value is 4MiB
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Filter: bloom,
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}
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}
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dbFolder := fmt.Sprintf("%s/%s", store.dir, name)
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os.MkdirAll(dbFolder, 0755)
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db, dbErr := leveldb.OpenFile(dbFolder, opts)
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if leveldb_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 nil, dbErr
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}
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return db, nil
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}
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func (store *LevelDB3Store) findDB(fullpath weed_util.FullPath, isForChildren bool) (*leveldb.DB, string, weed_util.FullPath, error) {
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store.dbsLock.RLock()
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defaultDB := store.dbs[DEFAULT]
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if !strings.HasPrefix(string(fullpath), "/buckets/") {
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store.dbsLock.RUnlock()
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return defaultDB, DEFAULT, fullpath, nil
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}
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// detect bucket
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bucketAndObjectKey := string(fullpath)[len("/buckets/"):]
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t := strings.Index(bucketAndObjectKey, "/")
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if t < 0 && !isForChildren {
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store.dbsLock.RUnlock()
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return defaultDB, DEFAULT, fullpath, nil
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}
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bucket := bucketAndObjectKey
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shortPath := weed_util.FullPath("/")
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if t > 0 {
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bucket = bucketAndObjectKey[:t]
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shortPath = weed_util.FullPath(bucketAndObjectKey[t:])
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}
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if db, found := store.dbs[bucket]; found {
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store.dbsLock.RUnlock()
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return db, bucket, shortPath, nil
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}
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store.dbsLock.RUnlock()
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db, err := store.createDB(bucket)
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return db, bucket, shortPath, err
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}
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func (store *LevelDB3Store) createDB(bucket string) (*leveldb.DB, error) {
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store.dbsLock.Lock()
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defer store.dbsLock.Unlock()
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// double check after getting the write lock
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if db, found := store.dbs[bucket]; found {
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return db, nil
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}
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// create db
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db, err := store.loadDB(bucket)
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if err != nil {
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return nil, err
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}
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store.dbs[bucket] = db
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return db, nil
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}
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func (store *LevelDB3Store) closeDB(bucket string) {
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store.dbsLock.Lock()
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defer store.dbsLock.Unlock()
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if db, found := store.dbs[bucket]; found {
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db.Close()
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delete(store.dbs, bucket)
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}
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}
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func (store *LevelDB3Store) BeginTransaction(ctx context.Context) (context.Context, error) {
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return ctx, nil
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}
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func (store *LevelDB3Store) CommitTransaction(ctx context.Context) error {
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return nil
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}
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func (store *LevelDB3Store) RollbackTransaction(ctx context.Context) error {
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return nil
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}
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func (store *LevelDB3Store) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
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db, _, shortPath, err := store.findDB(entry.FullPath, false)
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if err != nil {
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return fmt.Errorf("findDB %s : %v", entry.FullPath, err)
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}
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dir, name := shortPath.DirAndName()
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key := genKey(dir, name)
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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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if len(entry.GetChunks()) > filer.CountEntryChunksForGzip {
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value = weed_util.MaybeGzipData(value)
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}
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err = db.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.GetChunks()))
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return nil
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}
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func (store *LevelDB3Store) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
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return store.InsertEntry(ctx, entry)
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}
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func (store *LevelDB3Store) FindEntry(ctx context.Context, fullpath weed_util.FullPath) (entry *filer.Entry, err error) {
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db, _, shortPath, err := store.findDB(fullpath, false)
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if err != nil {
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return nil, fmt.Errorf("findDB %s : %v", fullpath, err)
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}
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dir, name := shortPath.DirAndName()
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key := genKey(dir, name)
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data, err := db.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", fullpath, err)
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}
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entry = &filer.Entry{
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FullPath: fullpath,
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}
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err = entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(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.GetChunks()), "data", len(data), string(data))
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return entry, nil
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}
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func (store *LevelDB3Store) DeleteEntry(ctx context.Context, fullpath weed_util.FullPath) (err error) {
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db, _, shortPath, err := store.findDB(fullpath, false)
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if err != nil {
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return fmt.Errorf("findDB %s : %v", fullpath, err)
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}
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dir, name := shortPath.DirAndName()
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key := genKey(dir, name)
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err = db.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 *LevelDB3Store) DeleteFolderChildren(ctx context.Context, fullpath weed_util.FullPath) (err error) {
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db, bucket, shortPath, err := store.findDB(fullpath, true)
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if err != nil {
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return fmt.Errorf("findDB %s : %v", fullpath, err)
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}
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if bucket != DEFAULT && shortPath == "/" {
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store.closeDB(bucket)
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if bucket != "" { // just to make sure
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os.RemoveAll(store.dir + "/" + bucket)
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}
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return nil
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}
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directoryPrefix := genDirectoryKeyPrefix(shortPath, "")
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batch := new(leveldb.Batch)
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iter := db.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 = db.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 *LevelDB3Store) ListDirectoryEntries(ctx context.Context, dirPath weed_util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
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return store.ListDirectoryPrefixedEntries(ctx, dirPath, startFileName, includeStartFile, limit, "", eachEntryFunc)
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}
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func (store *LevelDB3Store) ListDirectoryPrefixedEntries(ctx context.Context, dirPath weed_util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
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db, _, shortPath, err := store.findDB(dirPath, true)
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if err != nil {
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return lastFileName, fmt.Errorf("findDB %s : %v", dirPath, err)
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}
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directoryPrefix := genDirectoryKeyPrefix(shortPath, prefix)
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lastFileStart := directoryPrefix
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if startFileName != "" {
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lastFileStart = genDirectoryKeyPrefix(shortPath, startFileName)
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}
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iter := db.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 && !includeStartFile {
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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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lastFileName = fileName
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entry := &filer.Entry{
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FullPath: weed_util.NewFullPath(string(dirPath), fileName),
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}
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// println("list", entry.FullPath, "chunks", len(entry.GetChunks()))
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if decodeErr := entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(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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if !eachEntryFunc(entry) {
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break
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}
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}
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iter.Release()
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return lastFileName, err
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}
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func genKey(dirPath, fileName string) (key []byte) {
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key = hashToBytes(dirPath)
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key = append(key, []byte(fileName)...)
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return key
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}
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func genDirectoryKeyPrefix(fullpath weed_util.FullPath, startFileName string) (keyPrefix []byte) {
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keyPrefix = hashToBytes(string(fullpath))
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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
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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
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func hashToBytes(dir string) []byte {
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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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return b
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}
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func (store *LevelDB3Store) Shutdown() {
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for _, db := range store.dbs {
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db.Close()
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}
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}
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