mirror of
https://github.com/seaweedfs/seaweedfs.git
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368 lines
10 KiB
Go
368 lines
10 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/seaweedfs/seaweedfs/weed/filer"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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"github.com/seaweedfs/seaweedfs/weed/util"
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"strings"
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"sync"
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)
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type SqlGenerator interface {
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GetSqlInsert(tableName string) string
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GetSqlUpdate(tableName string) string
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GetSqlFind(tableName string) string
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GetSqlDelete(tableName string) string
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GetSqlDeleteFolderChildren(tableName string) string
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GetSqlListExclusive(tableName string) string
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GetSqlListInclusive(tableName string) string
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GetSqlCreateTable(tableName string) string
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GetSqlDropTable(tableName string) string
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}
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type AbstractSqlStore struct {
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SqlGenerator
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DB *sql.DB
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SupportBucketTable bool
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dbs map[string]bool
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dbsLock sync.Mutex
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}
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var _ filer.BucketAware = (*AbstractSqlStore)(nil)
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func (store *AbstractSqlStore) CanDropWholeBucket() bool {
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return store.SupportBucketTable
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}
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func (store *AbstractSqlStore) OnBucketCreation(bucket string) {
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store.dbsLock.Lock()
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defer store.dbsLock.Unlock()
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store.CreateTable(context.Background(), bucket)
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if store.dbs == nil {
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return
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}
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store.dbs[bucket] = true
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}
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func (store *AbstractSqlStore) OnBucketDeletion(bucket string) {
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store.dbsLock.Lock()
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defer store.dbsLock.Unlock()
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store.deleteTable(context.Background(), bucket)
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if store.dbs == nil {
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return
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}
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delete(store.dbs, bucket)
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}
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const (
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DEFAULT_TABLE = "filemeta"
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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, fullpath util.FullPath, isForChildren bool) (txOrDB TxOrDB, bucket string, shortPath util.FullPath, err error) {
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shortPath = fullpath
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bucket = DEFAULT_TABLE
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if tx, ok := ctx.Value("tx").(*sql.Tx); ok {
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txOrDB = tx
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} else {
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txOrDB = store.DB
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}
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if !store.SupportBucketTable {
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return
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}
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if !strings.HasPrefix(string(fullpath), "/buckets/") {
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return
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}
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// detect bucket
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bucketAndObjectKey := string(fullpath)[len("/buckets/"):]
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t := strings.Index(bucketAndObjectKey, "/")
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if t < 0 && !isForChildren {
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return
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}
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bucket = bucketAndObjectKey
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shortPath = "/"
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if t > 0 {
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bucket = bucketAndObjectKey[:t]
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shortPath = util.FullPath(bucketAndObjectKey[t:])
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}
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if isValidBucket(bucket) {
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store.dbsLock.Lock()
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defer store.dbsLock.Unlock()
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if store.dbs == nil {
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store.dbs = make(map[string]bool)
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}
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if _, found := store.dbs[bucket]; !found {
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if err = store.CreateTable(ctx, bucket); err == nil {
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store.dbs[bucket] = true
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}
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}
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}
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return
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}
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func (store *AbstractSqlStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
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db, bucket, shortPath, err := store.getTxOrDB(ctx, entry.FullPath, false)
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if err != nil {
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return fmt.Errorf("findDB %s : %v", entry.FullPath, err)
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}
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dir, name := shortPath.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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if len(entry.GetChunks()) > filer.CountEntryChunksForGzip {
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meta = util.MaybeGzipData(meta)
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}
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res, err := db.ExecContext(ctx, store.GetSqlInsert(bucket), util.HashStringToLong(dir), name, dir, meta)
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if err == nil {
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return
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}
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if !strings.Contains(strings.ToLower(err.Error()), "duplicate") {
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// return fmt.Errorf("insert: %s", err)
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// skip this since the error can be in a different language
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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: %v", entry.FullPath, err)
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res, err = db.ExecContext(ctx, store.GetSqlUpdate(bucket), 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 *filer.Entry) (err error) {
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db, bucket, shortPath, err := store.getTxOrDB(ctx, entry.FullPath, false)
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if err != nil {
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return fmt.Errorf("findDB %s : %v", entry.FullPath, err)
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}
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dir, name := shortPath.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 := db.ExecContext(ctx, store.GetSqlUpdate(bucket), 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) (*filer.Entry, error) {
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db, bucket, shortPath, err := store.getTxOrDB(ctx, fullpath, false)
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if err != nil {
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return nil, fmt.Errorf("findDB %s : %v", fullpath, err)
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}
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dir, name := shortPath.DirAndName()
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row := db.QueryRowContext(ctx, store.GetSqlFind(bucket), 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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if err == sql.ErrNoRows {
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return nil, filer_pb.ErrNotFound
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}
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return nil, fmt.Errorf("find %s: %v", fullpath, err)
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}
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entry := &filer.Entry{
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FullPath: fullpath,
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}
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if err := entry.DecodeAttributesAndChunks(util.MaybeDecompressData(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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db, bucket, shortPath, err := store.getTxOrDB(ctx, fullpath, false)
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if err != nil {
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return fmt.Errorf("findDB %s : %v", fullpath, err)
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}
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dir, name := shortPath.DirAndName()
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res, err := db.ExecContext(ctx, store.GetSqlDelete(bucket), 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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db, bucket, shortPath, err := store.getTxOrDB(ctx, fullpath, true)
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if err != nil {
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return fmt.Errorf("findDB %s : %v", fullpath, err)
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}
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if isValidBucket(bucket) && shortPath == "/" {
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if err = store.deleteTable(ctx, bucket); err == nil {
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store.dbsLock.Lock()
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delete(store.dbs, bucket)
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store.dbsLock.Unlock()
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return nil
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} else {
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return err
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}
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}
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glog.V(4).Infof("delete %s SQL %s %d", string(shortPath), store.GetSqlDeleteFolderChildren(bucket), util.HashStringToLong(string(shortPath)))
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res, err := db.ExecContext(ctx, store.GetSqlDeleteFolderChildren(bucket), util.HashStringToLong(string(shortPath)), string(shortPath))
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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, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
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db, bucket, shortPath, err := store.getTxOrDB(ctx, dirPath, true)
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if err != nil {
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return lastFileName, fmt.Errorf("findDB %s : %v", dirPath, err)
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}
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sqlText := store.GetSqlListExclusive(bucket)
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if includeStartFile {
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sqlText = store.GetSqlListInclusive(bucket)
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}
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rows, err := db.QueryContext(ctx, sqlText, util.HashStringToLong(string(shortPath)), startFileName, string(shortPath), prefix+"%", limit+1)
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if err != nil {
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return lastFileName, fmt.Errorf("list %s : %v", dirPath, 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", dirPath, err)
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return lastFileName, fmt.Errorf("scan %s: %v", dirPath, err)
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}
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lastFileName = name
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entry := &filer.Entry{
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FullPath: util.NewFullPath(string(dirPath), name),
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}
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if err = entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); err != nil {
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glog.V(0).Infof("scan decode %s : %v", entry.FullPath, err)
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return lastFileName, fmt.Errorf("scan decode %s : %v", entry.FullPath, err)
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}
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if !eachEntryFunc(entry) {
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break
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}
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}
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return lastFileName, nil
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}
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func (store *AbstractSqlStore) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
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return store.ListDirectoryPrefixedEntries(ctx, dirPath, startFileName, includeStartFile, limit, "", nil)
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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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func isValidBucket(bucket string) bool {
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return bucket != DEFAULT_TABLE && bucket != ""
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}
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func (store *AbstractSqlStore) CreateTable(ctx context.Context, bucket string) error {
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if !store.SupportBucketTable {
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return nil
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}
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_, err := store.DB.ExecContext(ctx, store.SqlGenerator.GetSqlCreateTable(bucket))
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return err
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}
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func (store *AbstractSqlStore) deleteTable(ctx context.Context, bucket string) error {
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if !store.SupportBucketTable {
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return nil
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}
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_, err := store.DB.ExecContext(ctx, store.SqlGenerator.GetSqlDropTable(bucket))
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return err
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}
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