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txn.go
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txn.go
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// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package localstore
import (
"fmt"
log "github.com/Sirupsen/logrus"
"github.com/juju/errors"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/terror"
)
var (
_ kv.Transaction = (*dbTxn)(nil)
)
// dbTxn is not thread safe
type dbTxn struct {
us kv.UnionStore
store *dbStore // for commit
tid uint64
valid bool
version kv.Version // commit version
lockedKeys map[string]struct{} // origin version in snapshot
dirty bool
}
func newTxn(s *dbStore, ver kv.Version) *dbTxn {
txn := &dbTxn{
us: kv.NewUnionStore(newSnapshot(s, ver)),
store: s,
tid: ver.Ver,
valid: true,
version: kv.MinVersion,
lockedKeys: make(map[string]struct{}),
}
log.Debugf("[kv] Begin txn:%d", txn.tid)
return txn
}
// Implement transaction interface
func (txn *dbTxn) Get(k kv.Key) ([]byte, error) {
return txn.us.Get(k)
}
func (txn *dbTxn) Set(k kv.Key, data []byte) error {
txn.dirty = true
return txn.us.Set(k, data)
}
func (txn *dbTxn) String() string {
return fmt.Sprintf("%d", txn.tid)
}
func (txn *dbTxn) Seek(k kv.Key) (kv.Iterator, error) {
return txn.us.Seek(k)
}
func (txn *dbTxn) SeekReverse(k kv.Key) (kv.Iterator, error) {
return txn.us.SeekReverse(k)
}
func (txn *dbTxn) Delete(k kv.Key) error {
txn.dirty = true
return txn.us.Delete(k)
}
func (txn *dbTxn) SetOption(opt kv.Option, val interface{}) {
txn.us.SetOption(opt, val)
}
func (txn *dbTxn) DelOption(opt kv.Option) {
txn.us.DelOption(opt)
}
func (txn *dbTxn) doCommit() error {
// Check schema lease.
checker, ok := txn.us.GetOption(kv.SchemaLeaseChecker).(schemaLeaseChecker)
if ok {
// DDL job doesn't set this option.
currVer, err := txn.store.CurrentVersion()
if err != nil {
return errors.Trace(err)
}
if err := checker.Check(currVer.Ver); err != nil {
return errors.Trace(err)
}
}
// check lazy condition pairs
if err := txn.us.CheckLazyConditionPairs(); err != nil {
return errors.Trace(err)
}
err := txn.us.WalkBuffer(func(k kv.Key, v []byte) error {
e := txn.LockKeys(k)
return errors.Trace(e)
})
if err != nil {
return errors.Trace(err)
}
return txn.store.CommitTxn(txn)
}
func (txn *dbTxn) Commit() error {
if !txn.valid {
return errors.Trace(kv.ErrInvalidTxn)
}
log.Debugf("[kv] commit txn %d", txn.tid)
defer terror.Call(txn.close)
return errors.Trace(txn.doCommit())
}
func (txn *dbTxn) GetSnapshot() kv.Snapshot {
return newSnapshot(txn.store, kv.Version{Ver: txn.tid})
}
type schemaLeaseChecker interface {
Check(txnTS uint64) error
}
func (txn *dbTxn) close() error {
txn.lockedKeys = nil
txn.valid = false
return nil
}
func (txn *dbTxn) Rollback() error {
if !txn.valid {
return errors.Trace(kv.ErrInvalidTxn)
}
log.Infof("[kv] Rollback txn %d", txn.tid)
return txn.close()
}
func (txn *dbTxn) LockKeys(keys ...kv.Key) error {
for _, key := range keys {
txn.lockedKeys[string(key)] = struct{}{}
}
return nil
}
func (txn *dbTxn) IsReadOnly() bool {
return !txn.dirty
}
func (txn *dbTxn) StartTS() uint64 {
return txn.tid
}
func (txn *dbTxn) Valid() bool {
return txn.valid
}
func (txn *dbTxn) Size() int {
return txn.us.Size()
}
func (txn *dbTxn) Len() int {
return txn.us.Len()
}