102 lines
2.9 KiB
Go
102 lines
2.9 KiB
Go
// Copyright 2023 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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"fmt"
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"sync"
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"github.com/ngaut/pools"
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"github.com/pingcap/errors"
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"github.com/pingcap/kvproto/pkg/kvrpcpb"
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"github.com/pingcap/tidb/pkg/ddl/logutil"
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"github.com/pingcap/tidb/pkg/domain/infosync"
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"github.com/pingcap/tidb/pkg/parser/mysql"
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"github.com/pingcap/tidb/pkg/sessionctx"
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"github.com/pingcap/tidb/pkg/util"
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"github.com/pingcap/tidb/pkg/util/intest"
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)
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// Pool is used to new Session.
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type Pool struct {
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mu struct {
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sync.Mutex
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closed bool
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}
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resPool util.SessionPool
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}
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// NewSessionPool creates a new Session pool.
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func NewSessionPool(resPool util.SessionPool) *Pool {
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intest.AssertNotNil(resPool)
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return &Pool{resPool: resPool}
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}
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// Get gets sessionCtx from context resource pool.
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// Please remember to call Put after you finished using sessionCtx.
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func (sg *Pool) Get() (sessionctx.Context, error) {
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sg.mu.Lock()
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if sg.mu.closed {
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sg.mu.Unlock()
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return nil, errors.Errorf("session pool is closed")
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}
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sg.mu.Unlock()
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// no need to protect sg.resPool
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resource, err := sg.resPool.Get()
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if err != nil {
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return nil, errors.Trace(err)
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}
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ctx, ok := resource.(sessionctx.Context)
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if !ok {
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return nil, errors.Trace(fmt.Errorf("need sessionctx.Context, but got %T", ctx))
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}
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ctx.GetSessionVars().SetStatusFlag(mysql.ServerStatusAutocommit, true)
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ctx.GetSessionVars().InRestrictedSQL = true
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ctx.GetSessionVars().StmtCtx.SetTimeZone(ctx.GetSessionVars().Location())
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ctx.GetSessionVars().SetDiskFullOpt(kvrpcpb.DiskFullOpt_AllowedOnAlmostFull)
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infosync.StoreInternalSession(ctx)
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return ctx, nil
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}
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// Put returns sessionCtx to context resource pool.
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func (sg *Pool) Put(ctx sessionctx.Context) {
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// no need to protect sg.resPool, even the sg.resPool is closed, the ctx still need to
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// Put into resPool, because when resPool is closing, it will wait all the ctx returns, then resPool finish closing.
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intest.AssertFunc(func() bool {
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txn, _ := ctx.Txn(false)
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return txn == nil || !txn.Valid()
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})
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ctx.RollbackTxn(context.Background())
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ctx.GetSessionVars().ClearDiskFullOpt()
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sg.resPool.Put(ctx.(pools.Resource))
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infosync.DeleteInternalSession(ctx)
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}
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// Close clean up the Pool.
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func (sg *Pool) Close() {
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sg.mu.Lock()
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defer sg.mu.Unlock()
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// prevent closing resPool twice.
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if sg.mu.closed {
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return
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}
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logutil.DDLLogger().Info("closing session pool")
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sg.resPool.Close()
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sg.mu.closed = true
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}
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