1 files changed, 256 insertions, 0 deletions
diff --git a/weed/filer/ydb/ydb_store.go b/weed/filer/ydb/ydb_store.go
new file mode 100644
index 000000000..7278c6301
--- /dev/null
+++ b/weed/filer/ydb/ydb_store.go
@@ -0,0 +1,256 @@
+package ydb
+
+import (
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/yandex-cloud/ydb-go-sdk/v2"
+	"github.com/yandex-cloud/ydb-go-sdk/v2/connect"
+	"github.com/yandex-cloud/ydb-go-sdk/v2/table"
+	"strings"
+	"time"
+)
+
+var (
+	roTX = table.TxControl(
+		table.BeginTx(table.WithOnlineReadOnly()),
+		table.CommitTx(),
+	)
+	rwTX = table.TxControl(
+		table.BeginTx(table.WithSerializableReadWrite()),
+		table.CommitTx(),
+	)
+)
+
+const (
+	createQuery = `
+		PRAGMA TablePathPrefix("%s");
+		CREATE TABLE file_meta (
+			dir_hash int64,
+			name Utf8,
+			directory Utf8,
+			meta String,
+			PRIMARY KEY (dir_hash, name)
+		);`
+	insertQuery = `
+		DECLARE $dir_hash int64;
+		DECLARE $name AS Utf8;
+		DECLARE $directory AS Utf8;
+		DECLARE $meta AS String;
+
+		UPSERT INTO file_meta
+			(dir_hash, name, directory, meta)
+		VALUES
+			($dir_hash, $name, $directory, $meta);`
+	updateQuery = `
+		DECLARE $dir_hash int64;
+		DECLARE $name AS Utf8;
+		DECLARE $directory AS Utf8;
+		DECLARE $meta AS String;
+
+		REPLACE INTO file_meta
+			(dir_hash, name, directory, meta)
+		VALUES
+			($dir_hash, $name, $directory, $meta)
+		COMMIT;`
+	deleteQuery = `
+		DECLARE $dir_hash int64;
+		DECLARE $name AS Utf8;
+
+		DELETE FROM file_meta 
+		WHERE dir_hash == $dir_hash AND name == $name;
+		COMMIT;`
+	findQuery = `
+		DECLARE $dir_hash int64;
+		DECLARE $name AS Utf8;
+		
+		SELECT meta
+		FROM file_meta
+		WHERE dir_hash == $dir_hash AND name == $name;`
+)
+
+type YdbStore struct {
+	SupportBucketTable bool
+	DB                 *connect.Connection
+	connParams         connect.ConnectParams
+	connCtx            context.Context
+	dirBuckets         string
+	tablePathPrefix    string
+}
+
+func init() {
+	filer.Stores = append(filer.Stores, &YdbStore{})
+}
+
+func (store *YdbStore) GetName() string {
+	return "ydb"
+}
+
+func (store *YdbStore) Initialize(configuration util.Configuration, prefix string) (err error) {
+	return store.initialize(configuration.GetString(prefix + "coonectionUrl"))
+}
+
+func (store *YdbStore) initialize(sqlUrl string) (err error) {
+	store.SupportBucketTable = false
+	var cancel context.CancelFunc
+	store.connCtx, cancel = context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	store.connParams = connect.MustConnectionString(sqlUrl)
+	store.DB, err = connect.New(store.connCtx, store.connParams)
+	if err != nil {
+		store.DB.Close()
+		store.DB = nil
+		return fmt.Errorf("can not connect to %s error:%v", sqlUrl, err)
+	}
+	defer store.DB.Close()
+
+	if err = store.DB.EnsurePathExists(store.connCtx, store.connParams.Database()); err != nil {
+		return fmt.Errorf("connect to %s error:%v", sqlUrl, err)
+	}
+	return nil
+}
+
+func (store *YdbStore) insertOrUpdateEntry(ctx context.Context, entry *filer.Entry, query string) (err error) {
+	dir, name := entry.FullPath.DirAndName()
+	meta, err := entry.EncodeAttributesAndChunks()
+	if err != nil {
+		return fmt.Errorf("encode %s: %s", entry.FullPath, err)
+	}
+	fileMeta := FileMeta{util.HashStringToLong(dir), name, dir, meta}
+	return table.Retry(ctx, store.DB.Table().Pool(),
+		table.OperationFunc(func(ctx context.Context, s *table.Session) (err error) {
+			stmt, err := s.Prepare(ctx, store.withPragma(store.getPrefix(dir), query))
+			if err != nil {
+				return err
+			}
+			_, _, err = stmt.Execute(ctx, rwTX, fileMeta.QueryParameters())
+			return err
+		}),
+	)
+}
+
+func (store *YdbStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
+	return store.insertOrUpdateEntry(ctx, entry, insertQuery)
+}
+
+func (store *YdbStore) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
+	return store.insertOrUpdateEntry(ctx, entry, updateQuery)
+}
+
+func (store *YdbStore) FindEntry(ctx context.Context, fullpath util.FullPath) (entry *filer.Entry, err error) {
+	dir, name := fullpath.DirAndName()
+	var res *table.Result
+	err = table.Retry(ctx, store.DB.Table().Pool(),
+		table.OperationFunc(func(ctx context.Context, s *table.Session) (err error) {
+			stmt, err := s.Prepare(ctx, store.withPragma(store.getPrefix(dir), findQuery))
+			if err != nil {
+				return err
+			}
+			_, res, err = stmt.Execute(ctx, rwTX, table.NewQueryParameters(
+				table.ValueParam("$dir_hash", ydb.Int64Value(util.HashStringToLong(dir))),
+				table.ValueParam("$name", ydb.UTF8Value(name))))
+			return err
+		}),
+	)
+	if err != nil {
+		return nil, err
+	}
+	for res.NextSet() {
+		for res.NextRow() {
+			res.SeekItem("meta")
+			entry.FullPath = fullpath
+			if err := entry.DecodeAttributesAndChunks(util.MaybeDecompressData(res.String())); err != nil {
+				return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
+			}
+			return entry, nil
+		}
+	}
+
+	return nil, filer_pb.ErrNotFound
+}
+
+func (store *YdbStore) DeleteEntry(ctx context.Context, fullpath util.FullPath) (err error) {
+	dir, name := fullpath.DirAndName()
+	return table.Retry(ctx, store.DB.Table().Pool(),
+		table.OperationFunc(func(ctx context.Context, s *table.Session) (err error) {
+			stmt, err := s.Prepare(ctx, store.withPragma(store.getPrefix(dir), deleteQuery))
+			if err != nil {
+				return err
+			}
+			_, _, err = stmt.Execute(ctx, rwTX, table.NewQueryParameters(
+				table.ValueParam("$dir_hash", ydb.Int64Value(util.HashStringToLong(dir))),
+				table.ValueParam("$name", ydb.UTF8Value(name))))
+			return err
+		}),
+	)
+}
+
+func (store *YdbStore) DeleteFolderChildren(ctx context.Context, fullpath util.FullPath) (err error) {
+	return nil
+}
+
+func (store *YdbStore) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (store *YdbStore) ListDirectoryPrefixedEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (store *YdbStore) BeginTransaction(ctx context.Context) (context.Context, error) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (store *YdbStore) CommitTransaction(ctx context.Context) error {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (store *YdbStore) RollbackTransaction(ctx context.Context) error {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (store *YdbStore) KvPut(ctx context.Context, key []byte, value []byte) (err error) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (store *YdbStore) KvGet(ctx context.Context, key []byte) (value []byte, err error) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (store *YdbStore) KvDelete(ctx context.Context, key []byte) (err error) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (store *YdbStore) Shutdown() {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (store *YdbStore) getPrefix(dir string) string {
+	prefixBuckets := store.dirBuckets + "/"
+	if strings.HasPrefix(dir, prefixBuckets) {
+		// detect bucket
+		bucketAndDir := dir[len(prefixBuckets):]
+		if t := strings.Index(bucketAndDir, "/"); t > 0 {
+			return bucketAndDir[:t]
+		}
+	}
+	return ""
+}
+
+func (store *YdbStore) withPragma(prefix, query string) string {
+	if store.tablePathPrefix != "" && store.tablePathPrefix != "/" {
+		prefix = store.tablePathPrefix + "/" + prefix
+	}
+	return `PRAGMA TablePathPrefix("` + prefix + `");` + query
+}