148 lines
3.7 KiB
Go
148 lines
3.7 KiB
Go
// Copyright 2022 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package session
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import (
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"context"
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/kv"
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"github.com/pingcap/tidb/parser/terror"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/sessionctx/variable"
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"github.com/pingcap/tidb/sessiontxn"
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"github.com/pingcap/tidb/util/chunk"
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"github.com/pingcap/tidb/util/sqlexec"
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)
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// Session is used to execute queries for TTL case
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type Session interface {
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sessionctx.Context
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// SessionInfoSchema returns information schema of current session
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SessionInfoSchema() infoschema.InfoSchema
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// ExecuteSQL executes the sql
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ExecuteSQL(ctx context.Context, sql string, args ...interface{}) ([]chunk.Row, error)
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// RunInTxn executes the specified function in a txn
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RunInTxn(ctx context.Context, fn func() error) (err error)
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// ResetWithGlobalTimeZone resets the session time zone to global time zone
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ResetWithGlobalTimeZone(ctx context.Context) error
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// Close closes the session
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Close()
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}
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type session struct {
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sessionctx.Context
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sqlExec sqlexec.SQLExecutor
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closeFn func()
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}
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// NewSession creates a new Session
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func NewSession(sctx sessionctx.Context, sqlExec sqlexec.SQLExecutor, closeFn func()) Session {
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return &session{
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Context: sctx,
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sqlExec: sqlExec,
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closeFn: closeFn,
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}
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}
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// SessionInfoSchema returns information schema of current session
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func (s *session) SessionInfoSchema() infoschema.InfoSchema {
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if s.Context == nil {
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return nil
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}
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return sessiontxn.GetTxnManager(s.Context).GetTxnInfoSchema()
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}
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// ExecuteSQL executes the sql
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func (s *session) ExecuteSQL(ctx context.Context, sql string, args ...interface{}) ([]chunk.Row, error) {
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if s.sqlExec == nil {
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return nil, errors.New("session is closed")
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}
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ctx = kv.WithInternalSourceType(ctx, kv.InternalTxnTTL)
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rs, err := s.sqlExec.ExecuteInternal(ctx, sql, args...)
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if err != nil {
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return nil, err
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}
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if rs == nil {
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return nil, nil
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}
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defer func() {
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terror.Log(rs.Close())
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}()
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return sqlexec.DrainRecordSet(ctx, rs, 8)
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}
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// RunInTxn executes the specified function in a txn
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func (s *session) RunInTxn(ctx context.Context, fn func() error) (err error) {
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if _, err = s.ExecuteSQL(ctx, "BEGIN"); err != nil {
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return err
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}
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success := false
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defer func() {
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if !success {
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_, err = s.ExecuteSQL(ctx, "ROLLBACK")
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terror.Log(err)
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}
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}()
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if err = fn(); err != nil {
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return err
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}
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if _, err = s.ExecuteSQL(ctx, "COMMIT"); err != nil {
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return err
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}
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success = true
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return err
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}
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// ResetWithGlobalTimeZone resets the session time zone to global time zone
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func (s *session) ResetWithGlobalTimeZone(ctx context.Context) error {
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sessVar := s.GetSessionVars()
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globalTZ, err := sessVar.GetGlobalSystemVar(ctx, variable.TimeZone)
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if err != nil {
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return err
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}
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tz, err := sessVar.GetSessionOrGlobalSystemVar(ctx, variable.TimeZone)
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if err != nil {
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return err
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}
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if globalTZ == tz {
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return nil
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}
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_, err = s.ExecuteSQL(ctx, "SET @@time_zone=@@global.time_zone")
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return err
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}
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// Close closes the session
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func (s *session) Close() {
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if s.closeFn != nil {
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s.closeFn()
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s.Context = nil
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s.sqlExec = nil
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s.closeFn = nil
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}
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}
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