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package abstract_sql
import (
"context"
"database/sql"
"fmt"
"github.com/chrislusf/seaweedfs/weed/filer"
"github.com/chrislusf/seaweedfs/weed/util/log"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
"strings"
)
type AbstractSqlStore struct {
DB *sql.DB
SqlInsert string
SqlUpdate string
SqlFind string
SqlDelete string
SqlDeleteFolderChildren string
SqlListExclusive string
SqlListInclusive string
}
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) TxOrDB {
if tx, ok := ctx.Value("tx").(*sql.Tx); ok {
return tx
}
return store.DB
}
func (store *AbstractSqlStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
dir, name := entry.FullPath.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 := store.getTxOrDB(ctx).ExecContext(ctx, store.SqlInsert, util.HashStringToLong(dir), name, dir, meta)
if err == nil {
return
}
if !strings.Contains(strings.ToLower(err.Error()), "duplicate") {
return fmt.Errorf("kv insert: %s", err)
}
// now the insert failed possibly due to duplication constraints
log.Debugf("insert %s falls back to update: %v", entry.FullPath, err)
res, err = store.getTxOrDB(ctx).ExecContext(ctx, store.SqlUpdate, 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) {
dir, name := entry.FullPath.DirAndName()
meta, err := entry.EncodeAttributesAndChunks()
if err != nil {
return fmt.Errorf("encode %s: %s", entry.FullPath, err)
}
res, err := store.getTxOrDB(ctx).ExecContext(ctx, store.SqlUpdate, 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) {
dir, name := fullpath.DirAndName()
row := store.getTxOrDB(ctx).QueryRowContext(ctx, store.SqlFind, 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 {
dir, name := fullpath.DirAndName()
res, err := store.getTxOrDB(ctx).ExecContext(ctx, store.SqlDelete, 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 {
res, err := store.getTxOrDB(ctx).ExecContext(ctx, store.SqlDeleteFolderChildren, util.HashStringToLong(string(fullpath)), 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, fullpath util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer.Entry, err error) {
sqlText := store.SqlListExclusive
if inclusive {
sqlText = store.SqlListInclusive
}
rows, err := store.getTxOrDB(ctx).QueryContext(ctx, sqlText, util.HashStringToLong(string(fullpath)), startFileName, string(fullpath), prefix+"%", limit)
if err != nil {
return nil, fmt.Errorf("list %s : %v", fullpath, err)
}
defer rows.Close()
for rows.Next() {
var name string
var data []byte
if err = rows.Scan(&name, &data); err != nil {
log.Infof("scan %s : %v", fullpath, err)
return nil, fmt.Errorf("scan %s: %v", fullpath, err)
}
entry := &filer.Entry{
FullPath: util.NewFullPath(string(fullpath), name),
}
if err = entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); err != nil {
log.Infof("scan decode %s : %v", entry.FullPath, err)
return nil, fmt.Errorf("scan decode %s : %v", entry.FullPath, err)
}
entries = append(entries, entry)
}
return entries, nil
}
func (store *AbstractSqlStore) ListDirectoryEntries(ctx context.Context, fullpath util.FullPath, startFileName string, inclusive bool, limit int) (entries []*filer.Entry, err error) {
return store.ListDirectoryPrefixedEntries(ctx, fullpath, startFileName, inclusive, limit, "")
}
func (store *AbstractSqlStore) Shutdown() {
store.DB.Close()
}
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