seaweedfs/weed/filer/leveldb3/leveldb3_store.go

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package leveldb
import (
"bytes"
"context"
"crypto/md5"
"fmt"
"io"
"os"
"strings"
"sync"
"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"
"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 (
DEFAULT = "_main"
)
func init() {
filer.Stores = append(filer.Stores, &LevelDB3Store{})
}
type LevelDB3Store struct {
dir string
dbs map[string]*leveldb.DB
dbsLock sync.RWMutex
}
func (store *LevelDB3Store) GetName() string {
return "leveldb3"
}
func (store *LevelDB3Store) Initialize(configuration weed_util.Configuration, prefix string) (err error) {
dir := configuration.GetString(prefix + "dir")
return store.initialize(dir)
}
func (store *LevelDB3Store) initialize(dir string) (err error) {
glog.Infof("filer store leveldb3 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)
}
store.dir = dir
db, loadDbErr := store.loadDB(DEFAULT)
if loadDbErr != nil {
return loadDbErr
}
store.dbs = make(map[string]*leveldb.DB)
store.dbs[DEFAULT] = db
return
}
func (store *LevelDB3Store) loadDB(name string) (*leveldb.DB, error) {
bloom := filter.NewBloomFilter(8) // false positive rate 0.02
opts := &opt.Options{
BlockCacheCapacity: 32 * 1024 * 1024, // default value is 8MiB
WriteBuffer: 16 * 1024 * 1024, // default value is 4MiB
Filter: bloom,
}
if name != DEFAULT {
opts = &opt.Options{
BlockCacheCapacity: 16 * 1024 * 1024, // default value is 8MiB
WriteBuffer: 8 * 1024 * 1024, // default value is 4MiB
Filter: bloom,
}
}
dbFolder := fmt.Sprintf("%s/%s", store.dir, name)
os.MkdirAll(dbFolder, 0755)
db, dbErr := leveldb.OpenFile(dbFolder, opts)
if leveldb_errors.IsCorrupted(dbErr) {
db, dbErr = leveldb.RecoverFile(dbFolder, opts)
}
if dbErr != nil {
glog.Errorf("filer store open dir %s: %v", dbFolder, dbErr)
return nil, dbErr
}
return db, nil
}
func (store *LevelDB3Store) findDB(fullpath weed_util.FullPath, isForChildren bool) (*leveldb.DB, string, weed_util.FullPath, error) {
store.dbsLock.RLock()
defaultDB := store.dbs[DEFAULT]
if !strings.HasPrefix(string(fullpath), "/buckets/") {
store.dbsLock.RUnlock()
return defaultDB, DEFAULT, fullpath, nil
}
// detect bucket
bucketAndObjectKey := string(fullpath)[len("/buckets/"):]
t := strings.Index(bucketAndObjectKey, "/")
if t < 0 && !isForChildren {
store.dbsLock.RUnlock()
return defaultDB, DEFAULT, fullpath, nil
}
bucket := bucketAndObjectKey
shortPath := weed_util.FullPath("/")
if t > 0 {
bucket = bucketAndObjectKey[:t]
shortPath = weed_util.FullPath(bucketAndObjectKey[t:])
}
if db, found := store.dbs[bucket]; found {
store.dbsLock.RUnlock()
return db, bucket, shortPath, nil
}
store.dbsLock.RUnlock()
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db, err := store.createDB(bucket)
return db, bucket, shortPath, err
}
func (store *LevelDB3Store) createDB(bucket string) (*leveldb.DB, error) {
store.dbsLock.Lock()
defer store.dbsLock.Unlock()
// double check after getting the write lock
if db, found := store.dbs[bucket]; found {
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return db, nil
}
// create db
db, err := store.loadDB(bucket)
if err != nil {
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return nil, err
}
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store.dbs[bucket] = db
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return db, nil
}
func (store *LevelDB3Store) closeDB(bucket string) {
store.dbsLock.Lock()
defer store.dbsLock.Unlock()
if db, found := store.dbs[bucket]; found {
db.Close()
delete(store.dbs, bucket)
}
}
func (store *LevelDB3Store) BeginTransaction(ctx context.Context) (context.Context, error) {
return ctx, nil
}
func (store *LevelDB3Store) CommitTransaction(ctx context.Context) error {
return nil
}
func (store *LevelDB3Store) RollbackTransaction(ctx context.Context) error {
return nil
}
func (store *LevelDB3Store) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
db, _, shortPath, err := store.findDB(entry.FullPath, false)
if err != nil {
return fmt.Errorf("findDB %s : %v", entry.FullPath, err)
}
dir, name := shortPath.DirAndName()
key := genKey(dir, name)
value, err := entry.EncodeAttributesAndChunks()
if err != nil {
return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
}
if len(entry.Chunks) > filer.CountEntryChunksForGzip {
value = weed_util.MaybeGzipData(value)
}
err = 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 *LevelDB3Store) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
return store.InsertEntry(ctx, entry)
}
func (store *LevelDB3Store) FindEntry(ctx context.Context, fullpath weed_util.FullPath) (entry *filer.Entry, err error) {
db, _, shortPath, err := store.findDB(fullpath, false)
if err != nil {
return nil, fmt.Errorf("findDB %s : %v", fullpath, err)
}
dir, name := shortPath.DirAndName()
key := genKey(dir, name)
data, err := 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.Chunks), "data", len(data), string(data))
return entry, nil
}
func (store *LevelDB3Store) DeleteEntry(ctx context.Context, fullpath weed_util.FullPath) (err error) {
db, _, shortPath, err := store.findDB(fullpath, false)
if err != nil {
return fmt.Errorf("findDB %s : %v", fullpath, err)
}
dir, name := shortPath.DirAndName()
key := genKey(dir, name)
err = db.Delete(key, nil)
if err != nil {
return fmt.Errorf("delete %s : %v", fullpath, err)
}
return nil
}
func (store *LevelDB3Store) DeleteFolderChildren(ctx context.Context, fullpath weed_util.FullPath) (err error) {
db, bucket, shortPath, err := store.findDB(fullpath, true)
if err != nil {
return fmt.Errorf("findDB %s : %v", fullpath, err)
}
if bucket != DEFAULT && shortPath == "/" {
store.closeDB(bucket)
if bucket != "" { // just to make sure
os.RemoveAll(store.dir + "/" + bucket)
}
return nil
}
directoryPrefix := genDirectoryKeyPrefix(shortPath, "")
batch := new(leveldb.Batch)
iter := 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(append(directoryPrefix, []byte(fileName)...))
}
iter.Release()
err = db.Write(batch, nil)
if err != nil {
return fmt.Errorf("delete %s : %v", fullpath, err)
}
return nil
}
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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) {
return store.ListDirectoryPrefixedEntries(ctx, dirPath, startFileName, includeStartFile, limit, "", eachEntryFunc)
}
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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)
if err != nil {
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return lastFileName, fmt.Errorf("findDB %s : %v", dirPath, err)
}
directoryPrefix := genDirectoryKeyPrefix(shortPath, prefix)
lastFileStart := directoryPrefix
if startFileName != "" {
lastFileStart = genDirectoryKeyPrefix(shortPath, startFileName)
}
iter := 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
}
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if fileName == startFileName && !includeStartFile {
continue
}
limit--
if limit < 0 {
break
}
lastFileName = fileName
entry := &filer.Entry{
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FullPath: weed_util.NewFullPath(string(dirPath), fileName),
}
// println("list", entry.FullPath, "chunks", len(entry.Chunks))
if decodeErr := entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(iter.Value())); decodeErr != nil {
err = decodeErr
glog.V(0).Infof("list %s : %v", entry.FullPath, err)
break
}
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if !eachEntryFunc(entry) {
break
}
}
iter.Release()
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return lastFileName, err
}
func genKey(dirPath, fileName string) (key []byte) {
key = hashToBytes(dirPath)
key = append(key, []byte(fileName)...)
return key
}
func genDirectoryKeyPrefix(fullpath weed_util.FullPath, startFileName string) (keyPrefix []byte) {
keyPrefix = hashToBytes(string(fullpath))
if len(startFileName) > 0 {
keyPrefix = append(keyPrefix, []byte(startFileName)...)
}
return keyPrefix
}
func getNameFromKey(key []byte) string {
return string(key[md5.Size:])
}
// hash directory
func hashToBytes(dir string) []byte {
h := md5.New()
io.WriteString(h, dir)
b := h.Sum(nil)
return b
}
func (store *LevelDB3Store) Shutdown() {
for _, db := range store.dbs {
db.Close()
}
}