gitea/vendor/github.com/pingcap/tidb/store/hbase/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 hbasekv
import (
"fmt"
"github.com/juju/errors"
"github.com/ngaut/log"
"github.com/pingcap/go-hbase"
"github.com/pingcap/go-themis"
"github.com/pingcap/tidb/kv"
)
var (
_ kv.Transaction = (*hbaseTxn)(nil)
)
// dbTxn implements kv.Transacton. It is not thread safe.
type hbaseTxn struct {
us kv.UnionStore
txn themis.Txn
store *hbaseStore // for commit
storeName string
tid uint64
valid bool
version kv.Version // commit version
dirty bool
}
func newHbaseTxn(t themis.Txn, storeName string) *hbaseTxn {
return &hbaseTxn{
txn: t,
valid: true,
storeName: storeName,
tid: t.GetStartTS(),
us: kv.NewUnionStore(newHbaseSnapshot(t, storeName)),
}
}
// Implement transaction interface
func (txn *hbaseTxn) Get(k kv.Key) ([]byte, error) {
log.Debugf("[kv] get key:%q, txn:%d", k, txn.tid)
return txn.us.Get(k)
}
func (txn *hbaseTxn) Set(k kv.Key, v []byte) error {
log.Debugf("[kv] set %q txn:%d", k, txn.tid)
txn.dirty = true
return txn.us.Set(k, v)
}
func (txn *hbaseTxn) String() string {
return fmt.Sprintf("%d", txn.tid)
}
func (txn *hbaseTxn) Seek(k kv.Key) (kv.Iterator, error) {
log.Debugf("[kv] seek %q txn:%d", k, txn.tid)
return txn.us.Seek(k)
}
func (txn *hbaseTxn) Delete(k kv.Key) error {
log.Debugf("[kv] delete %q txn:%d", k, txn.tid)
txn.dirty = true
return txn.us.Delete(k)
}
func (txn *hbaseTxn) SetOption(opt kv.Option, val interface{}) {
txn.us.SetOption(opt, val)
}
func (txn *hbaseTxn) DelOption(opt kv.Option) {
txn.us.DelOption(opt)
}
func (txn *hbaseTxn) doCommit() error {
if err := txn.us.CheckLazyConditionPairs(); err != nil {
return errors.Trace(err)
}
err := txn.us.WalkBuffer(func(k kv.Key, v []byte) error {
row := append([]byte(nil), k...)
if len(v) == 0 { // Deleted marker
d := hbase.NewDelete(row)
d.AddStringColumn(hbaseColFamily, hbaseQualifier)
err := txn.txn.Delete(txn.storeName, d)
if err != nil {
return errors.Trace(err)
}
} else {
val := append([]byte(nil), v...)
p := hbase.NewPut(row)
p.AddValue(hbaseColFamilyBytes, hbaseQualifierBytes, val)
txn.txn.Put(txn.storeName, p)
}
return nil
})
if err != nil {
return errors.Trace(err)
}
err = txn.txn.Commit()
if err != nil {
log.Error(err)
return errors.Trace(err)
}
txn.version = kv.NewVersion(txn.txn.GetCommitTS())
log.Debugf("[kv] commit successfully, txn.version:%d", txn.version.Ver)
return nil
}
func (txn *hbaseTxn) Commit() error {
if !txn.valid {
return kv.ErrInvalidTxn
}
log.Debugf("[kv] start to commit txn %d", txn.tid)
defer func() {
txn.close()
}()
return txn.doCommit()
}
func (txn *hbaseTxn) close() error {
txn.us.Release()
txn.valid = false
return nil
}
//if fail, themis auto rollback
func (txn *hbaseTxn) Rollback() error {
if !txn.valid {
return kv.ErrInvalidTxn
}
log.Warnf("[kv] Rollback txn %d", txn.tid)
return txn.close()
}
func (txn *hbaseTxn) LockKeys(keys ...kv.Key) error {
for _, key := range keys {
if err := txn.txn.LockRow(txn.storeName, key); err != nil {
return errors.Trace(err)
}
}
return nil
}
func (txn *hbaseTxn) IsReadOnly() bool {
return !txn.dirty
}
func (txn *hbaseTxn) StartTS() int64 {
return int64(txn.tid)
}
func (txn *hbaseTxn) GetClient() kv.Client {
return nil
}
type hbaseClient struct {
}
func (c *hbaseClient) SupportRequestType(reqType, subType int64) bool {
return false
}
func (c *hbaseClient) Send(req *kv.Request) kv.Response {
return nil
}