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207 lines
6 KiB
Go
207 lines
6 KiB
Go
package abstract_sql
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import (
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"context"
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"database/sql"
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"fmt"
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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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"github.com/chrislusf/seaweedfs/weed/util"
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)
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type AbstractSqlStore struct {
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DB *sql.DB
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SqlInsert string
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SqlUpdate string
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SqlFind string
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SqlDelete string
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SqlDeleteFolderChildren string
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SqlListExclusive string
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SqlListInclusive string
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}
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type TxOrDB interface {
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ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
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QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row
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QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
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}
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func (store *AbstractSqlStore) BeginTransaction(ctx context.Context) (context.Context, error) {
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tx, err := store.DB.BeginTx(ctx, &sql.TxOptions{
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Isolation: sql.LevelReadCommitted,
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ReadOnly: false,
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})
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if err != nil {
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return ctx, err
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}
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return context.WithValue(ctx, "tx", tx), nil
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}
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func (store *AbstractSqlStore) CommitTransaction(ctx context.Context) error {
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if tx, ok := ctx.Value("tx").(*sql.Tx); ok {
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return tx.Commit()
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}
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return nil
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}
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func (store *AbstractSqlStore) RollbackTransaction(ctx context.Context) error {
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if tx, ok := ctx.Value("tx").(*sql.Tx); ok {
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return tx.Rollback()
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}
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return nil
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}
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func (store *AbstractSqlStore) getTxOrDB(ctx context.Context) TxOrDB {
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if tx, ok := ctx.Value("tx").(*sql.Tx); ok {
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return tx
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}
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return store.DB
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}
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func (store *AbstractSqlStore) InsertEntry(ctx context.Context, entry *filer2.Entry) (err error) {
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dir, name := entry.FullPath.DirAndName()
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meta, err := entry.EncodeAttributesAndChunks()
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if err != nil {
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return fmt.Errorf("encode %s: %s", entry.FullPath, err)
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}
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res, err := store.getTxOrDB(ctx).ExecContext(ctx, store.SqlInsert, util.HashStringToLong(dir), name, dir, meta)
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if err != nil {
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return fmt.Errorf("insert %s: %s", entry.FullPath, err)
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}
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affectedRows, err := res.RowsAffected()
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if err == nil && affectedRows > 0 {
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return nil
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}
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// now the insert failed possibly due to duplication constraints
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glog.V(1).Infof("insert %s falls back to update: %s", entry.FullPath, err)
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res, err = store.getTxOrDB(ctx).ExecContext(ctx, store.SqlUpdate, meta, util.HashStringToLong(dir), name, dir)
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if err != nil {
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return fmt.Errorf("upsert %s: %s", entry.FullPath, err)
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}
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_, err = res.RowsAffected()
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if err != nil {
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return fmt.Errorf("upsert %s but no rows affected: %s", entry.FullPath, err)
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}
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return nil
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}
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func (store *AbstractSqlStore) UpdateEntry(ctx context.Context, entry *filer2.Entry) (err error) {
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dir, name := entry.FullPath.DirAndName()
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meta, err := entry.EncodeAttributesAndChunks()
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if err != nil {
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return fmt.Errorf("encode %s: %s", entry.FullPath, err)
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}
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res, err := store.getTxOrDB(ctx).ExecContext(ctx, store.SqlUpdate, meta, util.HashStringToLong(dir), name, dir)
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if err != nil {
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return fmt.Errorf("update %s: %s", entry.FullPath, err)
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}
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_, err = res.RowsAffected()
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if err != nil {
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return fmt.Errorf("update %s but no rows affected: %s", entry.FullPath, err)
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}
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return nil
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}
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func (store *AbstractSqlStore) FindEntry(ctx context.Context, fullpath util.FullPath) (*filer2.Entry, error) {
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dir, name := fullpath.DirAndName()
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row := store.getTxOrDB(ctx).QueryRowContext(ctx, store.SqlFind, util.HashStringToLong(dir), name, dir)
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var data []byte
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if err := row.Scan(&data); err != nil {
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return nil, filer_pb.ErrNotFound
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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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if err := entry.DecodeAttributesAndChunks(data); err != nil {
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return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
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}
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return entry, nil
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}
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func (store *AbstractSqlStore) DeleteEntry(ctx context.Context, fullpath util.FullPath) error {
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dir, name := fullpath.DirAndName()
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res, err := store.getTxOrDB(ctx).ExecContext(ctx, store.SqlDelete, util.HashStringToLong(dir), name, dir)
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if err != nil {
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return fmt.Errorf("delete %s: %s", fullpath, err)
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}
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_, err = res.RowsAffected()
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if err != nil {
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return fmt.Errorf("delete %s but no rows affected: %s", fullpath, err)
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}
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return nil
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}
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func (store *AbstractSqlStore) DeleteFolderChildren(ctx context.Context, fullpath util.FullPath) error {
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res, err := store.getTxOrDB(ctx).ExecContext(ctx, store.SqlDeleteFolderChildren, util.HashStringToLong(string(fullpath)), fullpath)
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if err != nil {
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return fmt.Errorf("deleteFolderChildren %s: %s", fullpath, err)
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}
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_, err = res.RowsAffected()
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if err != nil {
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return fmt.Errorf("deleteFolderChildren %s but no rows affected: %s", fullpath, err)
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}
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return nil
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}
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func (store *AbstractSqlStore) ListDirectoryPrefixedEntries(ctx context.Context, fullpath util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer2.Entry, err error) {
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sqlText := store.SqlListExclusive
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if inclusive {
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sqlText = store.SqlListInclusive
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}
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rows, err := store.getTxOrDB(ctx).QueryContext(ctx, sqlText, util.HashStringToLong(string(fullpath)), startFileName, string(fullpath), prefix, limit)
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if err != nil {
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return nil, fmt.Errorf("list %s : %v", fullpath, err)
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}
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defer rows.Close()
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for rows.Next() {
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var name string
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var data []byte
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if err = rows.Scan(&name, &data); err != nil {
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glog.V(0).Infof("scan %s : %v", fullpath, err)
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return nil, fmt.Errorf("scan %s: %v", fullpath, err)
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}
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entry := &filer2.Entry{
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FullPath: util.NewFullPath(string(fullpath), name),
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}
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if err = entry.DecodeAttributesAndChunks(data); err != nil {
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glog.V(0).Infof("scan decode %s : %v", entry.FullPath, err)
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return nil, fmt.Errorf("scan decode %s : %v", entry.FullPath, err)
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}
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entries = append(entries, entry)
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}
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return entries, nil
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}
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func (store *AbstractSqlStore) ListDirectoryEntries(ctx context.Context, fullpath util.FullPath, startFileName string, inclusive bool, limit int) (entries []*filer2.Entry, err error) {
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return store.ListDirectoryPrefixedEntries(ctx, fullpath, startFileName, inclusive, limit, "")
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}
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func (store *AbstractSqlStore) Shutdown() {
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store.DB.Close()
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}
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