filer: add tikv support

weed/command/scaffold.go

@@ -150,6 +150,11 @@ enabled = false
 servers = "localhost:2379"
 timeout = "3s"
 
+[tikv]
+enabled = false
+pdAddress = "192.168.199.113:2379"
+
+
 `
 
 	NOTIFICATION_TOML_EXAMPLE = `

weed/filer2/tikv/tikv_store.go

@@ -0,0 +1,216 @@
+package tikv
+
+import (
+	"bytes"
+	"context"
+	"crypto/md5"
+	"fmt"
+	"io"
+
+	"github.com/chrislusf/seaweedfs/weed/filer2"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	weed_util "github.com/chrislusf/seaweedfs/weed/util"
+
+	"github.com/pingcap/tidb/kv"
+	"github.com/pingcap/tidb/store/tikv"
+)
+
+func init() {
+	filer2.Stores = append(filer2.Stores, &TikvStore{})
+}
+
+type TikvStore struct {
+	store  kv.Storage
+}
+
+func (store *TikvStore) GetName() string {
+	return "tikv"
+}
+
+func (store *TikvStore) Initialize(configuration weed_util.Configuration) (err error) {
+	pdAddr := configuration.GetString("pdAddress")
+	return store.initialize(pdAddr)
+}
+
+func (store *TikvStore) initialize(pdAddr string) (err error) {
+	glog.Infof("filer store tikv pd address: %s", pdAddr)
+
+	driver := tikv.Driver{}
+
+	store.store, err = driver.Open(fmt.Sprintf("tikv://%s", pdAddr))
+
+	if err != nil {
+		return fmt.Errorf("open tikv %s : %v", pdAddr, err)
+	}
+
+	return
+}
+
+func (store *TikvStore) BeginTransaction(ctx context.Context) (context.Context, error) {
+	tx, err := store.store.Begin()
+	if err != nil {
+		return ctx, err
+	}
+	return context.WithValue(ctx, "tx", tx), nil
+}
+func (store *TikvStore) CommitTransaction(ctx context.Context) error {
+	tx, ok := ctx.Value("tx").(kv.Transaction)
+	if ok {
+		return tx.Commit(ctx)
+	}
+	return nil
+}
+func (store *TikvStore) RollbackTransaction(ctx context.Context) error {
+	tx, ok := ctx.Value("tx").(kv.Transaction)
+	if ok {
+		return tx.Rollback()
+	}
+	return nil
+}
+
+func (store *TikvStore) getTx(ctx context.Context) kv.Transaction {
+	if tx, ok := ctx.Value("tx").(kv.Transaction); ok {
+		return tx
+	}
+	return nil
+}
+
+func (store *TikvStore) InsertEntry(ctx context.Context, entry *filer2.Entry) (err error) {
+	dir, name := entry.DirAndName()
+	key := genKey(dir, name)
+
+	value, err := entry.EncodeAttributesAndChunks()
+	if err != nil {
+		return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
+	}
+
+	err = store.getTx(ctx).Set(key, value)
+
+	if err != nil {
+		return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
+	}
+
+	// println("saved", entry.FullPath, "chunks", len(entry.Chunks))
+
+	return nil
+}
+
+func (store *TikvStore) UpdateEntry(ctx context.Context, entry *filer2.Entry) (err error) {
+
+	return store.InsertEntry(ctx, entry)
+}
+
+func (store *TikvStore) FindEntry(ctx context.Context, fullpath filer2.FullPath) (entry *filer2.Entry, err error) {
+	dir, name := fullpath.DirAndName()
+	key := genKey(dir, name)
+
+	data, err := store.getTx(ctx).Get(key)
+
+	if err == kv.ErrNotExist {
+		return nil, filer2.ErrNotFound
+	}
+	if err != nil {
+		return nil, fmt.Errorf("get %s : %v", entry.FullPath, err)
+	}
+
+	entry = &filer2.Entry{
+		FullPath: fullpath,
+	}
+	err = entry.DecodeAttributesAndChunks(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 *TikvStore) DeleteEntry(ctx context.Context, fullpath filer2.FullPath) (err error) {
+	dir, name := fullpath.DirAndName()
+	key := genKey(dir, name)
+
+	err = store.getTx(ctx).Delete(key)
+	if err != nil {
+		return fmt.Errorf("delete %s : %v", fullpath, err)
+	}
+
+	return nil
+}
+
+func (store *TikvStore) ListDirectoryEntries(ctx context.Context, fullpath filer2.FullPath, startFileName string, inclusive bool,
+	limit int) (entries []*filer2.Entry, err error) {
+
+	directoryPrefix := genDirectoryKeyPrefix(fullpath, "")
+	lastFileStart := genDirectoryKeyPrefix(fullpath, startFileName)
+
+	iter, err := store.getTx(ctx).Iter(lastFileStart, nil)
+	if err != nil {
+		return nil, fmt.Errorf("list %s: %v", fullpath, err)
+	}
+	defer iter.Close()
+	for iter.Valid() {
+		key := iter.Key()
+		if !bytes.HasPrefix(key, directoryPrefix) {
+			break
+		}
+		fileName := getNameFromKey(key)
+		if fileName == "" {
+			iter.Next()
+			continue
+		}
+		if fileName == startFileName && !inclusive {
+			iter.Next()
+			continue
+		}
+		limit--
+		if limit < 0 {
+			break
+		}
+		entry := &filer2.Entry{
+			FullPath: filer2.NewFullPath(string(fullpath), fileName),
+		}
+
+		// println("list", entry.FullPath, "chunks", len(entry.Chunks))
+
+		if decodeErr := entry.DecodeAttributesAndChunks(iter.Value()); decodeErr != nil {
+			err = decodeErr
+			glog.V(0).Infof("list %s : %v", entry.FullPath, err)
+			break
+		}
+		entries = append(entries, entry)
+		iter.Next()
+	}
+
+	return entries, err
+}
+
+func genKey(dirPath, fileName string) (key []byte) {
+	key = hashToBytes(dirPath)
+	key = append(key, []byte(fileName)...)
+	return key
+}
+
+func genDirectoryKeyPrefix(fullpath filer2.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
+}

weed/server/filer_server.go

@@ -22,6 +22,7 @@ import (
 	_ "github.com/chrislusf/seaweedfs/weed/filer2/mysql"
 	_ "github.com/chrislusf/seaweedfs/weed/filer2/postgres"
 	_ "github.com/chrislusf/seaweedfs/weed/filer2/redis"
+	_ "github.com/chrislusf/seaweedfs/weed/filer2/tikv"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/notification"
 	_ "github.com/chrislusf/seaweedfs/weed/notification/aws_sqs"