package abstract_sql import ( "context" "database/sql" "fmt" "github.com/chrislusf/seaweedfs/weed/filer" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/util" "strings" "sync" ) type SqlGenerator interface { GetSqlInsert(bucket string) string GetSqlUpdate(bucket string) string GetSqlFind(bucket string) string GetSqlDelete(bucket string) string GetSqlDeleteFolderChildren(bucket string) string GetSqlListExclusive(bucket string) string GetSqlListInclusive(bucket string) string GetSqlCreateTable(bucket string) string GetSqlDropTable(bucket string) string } type AbstractSqlStore struct { SqlGenerator DB *sql.DB SupportBucketTable bool dbs map[string]bool dbsLock sync.Mutex } const ( DEFAULT_TABLE = "filemeta" ) type TxOrDB interface { ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error) QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error) } func (store *AbstractSqlStore) BeginTransaction(ctx context.Context) (context.Context, error) { tx, err := store.DB.BeginTx(ctx, &sql.TxOptions{ Isolation: sql.LevelReadCommitted, ReadOnly: false, }) if err != nil { return ctx, err } return context.WithValue(ctx, "tx", tx), nil } func (store *AbstractSqlStore) CommitTransaction(ctx context.Context) error { if tx, ok := ctx.Value("tx").(*sql.Tx); ok { return tx.Commit() } return nil } func (store *AbstractSqlStore) RollbackTransaction(ctx context.Context) error { if tx, ok := ctx.Value("tx").(*sql.Tx); ok { return tx.Rollback() } return nil } func (store *AbstractSqlStore) getTxOrDB(ctx context.Context, fullpath util.FullPath, isForChildren bool) (txOrDB TxOrDB, bucket string, shortPath util.FullPath, err error) { shortPath = fullpath bucket = DEFAULT_TABLE if tx, ok := ctx.Value("tx").(*sql.Tx); ok { txOrDB = tx } else { txOrDB = store.DB } if !store.SupportBucketTable { return } if !strings.HasPrefix(string(fullpath), "/buckets/") { return } // detect bucket bucketAndObjectKey := string(fullpath)[len("/buckets/"):] t := strings.Index(bucketAndObjectKey, "/") if t < 0 && !isForChildren { return } bucket = bucketAndObjectKey shortPath = "/" if t > 0 { bucket = bucketAndObjectKey[:t] shortPath = util.FullPath(bucketAndObjectKey[t:]) } if isValidBucket(bucket) { store.dbsLock.Lock() defer store.dbsLock.Unlock() if store.dbs == nil { store.dbs = make(map[string]bool) } if _, found := store.dbs[bucket]; !found { if err = store.CreateTable(ctx, bucket); err == nil { store.dbs[bucket] = true } } } return } func (store *AbstractSqlStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) { db, bucket, shortPath, err := store.getTxOrDB(ctx, entry.FullPath, false) if err != nil { return fmt.Errorf("findDB %s : %v", entry.FullPath, err) } dir, name := shortPath.DirAndName() meta, err := entry.EncodeAttributesAndChunks() if err != nil { return fmt.Errorf("encode %s: %s", entry.FullPath, err) } if len(entry.Chunks) > 50 { meta = util.MaybeGzipData(meta) } res, err := db.ExecContext(ctx, store.GetSqlInsert(bucket), util.HashStringToLong(dir), name, dir, meta) if err == nil { return } if !strings.Contains(strings.ToLower(err.Error()), "duplicate") { // return fmt.Errorf("insert: %s", err) // skip this since the error can be in a different language } // now the insert failed possibly due to duplication constraints glog.V(1).Infof("insert %s falls back to update: %v", entry.FullPath, err) res, err = db.ExecContext(ctx, store.GetSqlUpdate(bucket), meta, util.HashStringToLong(dir), name, dir) if err != nil { return fmt.Errorf("upsert %s: %s", entry.FullPath, err) } _, err = res.RowsAffected() if err != nil { return fmt.Errorf("upsert %s but no rows affected: %s", entry.FullPath, err) } return nil } func (store *AbstractSqlStore) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) { db, bucket, shortPath, err := store.getTxOrDB(ctx, entry.FullPath, false) if err != nil { return fmt.Errorf("findDB %s : %v", entry.FullPath, err) } dir, name := shortPath.DirAndName() meta, err := entry.EncodeAttributesAndChunks() if err != nil { return fmt.Errorf("encode %s: %s", entry.FullPath, err) } res, err := db.ExecContext(ctx, store.GetSqlUpdate(bucket), meta, util.HashStringToLong(dir), name, dir) if err != nil { return fmt.Errorf("update %s: %s", entry.FullPath, err) } _, err = res.RowsAffected() if err != nil { return fmt.Errorf("update %s but no rows affected: %s", entry.FullPath, err) } return nil } func (store *AbstractSqlStore) FindEntry(ctx context.Context, fullpath util.FullPath) (*filer.Entry, error) { db, bucket, shortPath, err := store.getTxOrDB(ctx, fullpath, false) if err != nil { return nil, fmt.Errorf("findDB %s : %v", fullpath, err) } dir, name := shortPath.DirAndName() row := db.QueryRowContext(ctx, store.GetSqlFind(bucket), util.HashStringToLong(dir), name, dir) var data []byte if err := row.Scan(&data); err != nil { if err == sql.ErrNoRows { return nil, filer_pb.ErrNotFound } return nil, fmt.Errorf("find %s: %v", fullpath, err) } entry := &filer.Entry{ FullPath: fullpath, } if err := entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); err != nil { return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err) } return entry, nil } func (store *AbstractSqlStore) DeleteEntry(ctx context.Context, fullpath util.FullPath) error { db, bucket, shortPath, err := store.getTxOrDB(ctx, fullpath, false) if err != nil { return fmt.Errorf("findDB %s : %v", fullpath, err) } dir, name := shortPath.DirAndName() res, err := db.ExecContext(ctx, store.GetSqlDelete(bucket), util.HashStringToLong(dir), name, dir) if err != nil { return fmt.Errorf("delete %s: %s", fullpath, err) } _, err = res.RowsAffected() if err != nil { return fmt.Errorf("delete %s but no rows affected: %s", fullpath, err) } return nil } func (store *AbstractSqlStore) DeleteFolderChildren(ctx context.Context, fullpath util.FullPath) error { db, bucket, shortPath, err := store.getTxOrDB(ctx, fullpath, true) if err != nil { return fmt.Errorf("findDB %s : %v", fullpath, err) } if isValidBucket(bucket) && shortPath == "/" { if err = store.deleteTable(ctx, bucket); err == nil { store.dbsLock.Lock() delete(store.dbs, bucket) store.dbsLock.Unlock() return nil } else { return err } } res, err := db.ExecContext(ctx, store.GetSqlDeleteFolderChildren(bucket), util.HashStringToLong(string(shortPath)), fullpath) if err != nil { return fmt.Errorf("deleteFolderChildren %s: %s", fullpath, err) } _, err = res.RowsAffected() if err != nil { return fmt.Errorf("deleteFolderChildren %s but no rows affected: %s", fullpath, err) } return nil } func (store *AbstractSqlStore) ListDirectoryPrefixedEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) { db, bucket, shortPath, err := store.getTxOrDB(ctx, dirPath, true) if err != nil { return lastFileName, fmt.Errorf("findDB %s : %v", dirPath, err) } sqlText := store.GetSqlListExclusive(bucket) if includeStartFile { sqlText = store.GetSqlListInclusive(bucket) } rows, err := db.QueryContext(ctx, sqlText, util.HashStringToLong(string(shortPath)), startFileName, string(shortPath), prefix+"%", limit+1) if err != nil { return lastFileName, fmt.Errorf("list %s : %v", dirPath, err) } defer rows.Close() for rows.Next() { var name string var data []byte if err = rows.Scan(&name, &data); err != nil { glog.V(0).Infof("scan %s : %v", dirPath, err) return lastFileName, fmt.Errorf("scan %s: %v", dirPath, err) } lastFileName = name entry := &filer.Entry{ FullPath: util.NewFullPath(string(dirPath), name), } if err = entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); err != nil { glog.V(0).Infof("scan decode %s : %v", entry.FullPath, err) return lastFileName, fmt.Errorf("scan decode %s : %v", entry.FullPath, err) } if !eachEntryFunc(entry) { break } } return lastFileName, nil } func (store *AbstractSqlStore) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) { return store.ListDirectoryPrefixedEntries(ctx, dirPath, startFileName, includeStartFile, limit, "", nil) } func (store *AbstractSqlStore) Shutdown() { store.DB.Close() } func isValidBucket(bucket string) bool { return bucket != DEFAULT_TABLE && bucket != "" } func (store *AbstractSqlStore) CreateTable(ctx context.Context, bucket string) error { if !store.SupportBucketTable { return nil } _, err := store.DB.ExecContext(ctx, store.SqlGenerator.GetSqlCreateTable(bucket)) return err } func (store *AbstractSqlStore) deleteTable(ctx context.Context, bucket string) error { if !store.SupportBucketTable { return nil } _, err := store.DB.ExecContext(ctx, store.SqlGenerator.GetSqlDropTable(bucket)) return err }