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in sharding mode, support local transaction (#255)
* in sharding mode, support local transaction
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| /* | ||
| * Copyright 2022 CECTC, 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, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package group | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/pkg/errors" | ||
| "github.com/uber-go/atomic" | ||
| "go.opentelemetry.io/otel/attribute" | ||
| "golang.org/x/sync/errgroup" | ||
|
|
||
| err2 "github.com/cectc/dbpack/pkg/errors" | ||
| "github.com/cectc/dbpack/pkg/log" | ||
| "github.com/cectc/dbpack/pkg/mysql" | ||
| "github.com/cectc/dbpack/pkg/proto" | ||
| "github.com/cectc/dbpack/pkg/tracing" | ||
| "github.com/cectc/dbpack/third_party/parser/ast" | ||
| ) | ||
|
|
||
| var ( | ||
| txID = atomic.NewUint32(0) | ||
| ) | ||
|
|
||
| type ComplexTx struct { | ||
| closed *atomic.Bool | ||
| id uint32 | ||
| txs map[string]proto.Tx | ||
| optimizer proto.Optimizer | ||
| } | ||
|
|
||
| func NewComplexTx(optimizer proto.Optimizer) proto.DBGroupTx { | ||
| txID.Inc() | ||
| return &ComplexTx{ | ||
| closed: atomic.NewBool(false), | ||
| id: txID.Load(), | ||
| txs: make(map[string]proto.Tx), | ||
| optimizer: optimizer, | ||
| } | ||
| } | ||
|
|
||
| func (tx *ComplexTx) Query(ctx context.Context, query string) (proto.Result, uint16, error) { | ||
| spanCtx, span := tracing.GetTraceSpan(ctx, tracing.GroupQuery) | ||
| defer span.End() | ||
|
|
||
| queryStmt := proto.QueryStmt(spanCtx) | ||
| if queryStmt == nil { | ||
| return nil, 0, errors.New("query stmt should not be nil") | ||
| } | ||
| plan, err := tx.optimizer.Optimize(spanCtx, queryStmt) | ||
| if err != nil { | ||
| return nil, 0, err | ||
| } | ||
| txCtx := proto.WithDBGroupTx(spanCtx, tx) | ||
| return plan.Execute(txCtx) | ||
| } | ||
|
|
||
| func (tx *ComplexTx) Execute(ctx context.Context, stmt ast.StmtNode, args ...interface{}) (proto.Result, uint16, error) { | ||
| spanCtx, span := tracing.GetTraceSpan(ctx, tracing.GroupExecute) | ||
| defer span.End() | ||
|
|
||
| plan, err := tx.optimizer.Optimize(spanCtx, stmt, args...) | ||
| if err != nil { | ||
| return nil, 0, err | ||
| } | ||
| txCtx := proto.WithDBGroupTx(spanCtx, tx) | ||
| return plan.Execute(txCtx) | ||
| } | ||
|
|
||
| func (tx *ComplexTx) Begin(ctx context.Context, executor proto.DBGroupExecutor) (proto.Tx, error) { | ||
| spanCtx, span := tracing.GetTraceSpan(ctx, tracing.GroupTransactionBegin) | ||
| span.SetAttributes(attribute.KeyValue{Key: "group", Value: attribute.StringValue(executor.GroupName())}) | ||
| defer span.End() | ||
|
|
||
| if childTx, ok := tx.txs[executor.GroupName()]; ok { | ||
| return childTx, nil | ||
| } | ||
| masterCtx := proto.WithMaster(spanCtx) | ||
| childTx, _, err := executor.Begin(masterCtx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| log.Debugf("DBGroup %s has begun local transaction!", executor.GroupName()) | ||
| tx.txs[executor.GroupName()] = childTx | ||
| return childTx, nil | ||
| } | ||
|
|
||
| func (tx *ComplexTx) Commit(ctx context.Context) (result proto.Result, err error) { | ||
| spanCtx, span := tracing.GetTraceSpan(ctx, tracing.GroupTxCommit) | ||
| defer span.End() | ||
|
|
||
| if tx.closed.Load() { | ||
| return nil, err2.ErrTransactionClosed | ||
| } | ||
| defer tx.Close() | ||
|
|
||
| var g errgroup.Group | ||
| for group, child := range tx.txs { | ||
| // https://golang.org/doc/faq#closures_and_goroutines | ||
| group, child := group, child | ||
| g.Go(func() error { | ||
| _, err := child.Commit(spanCtx) | ||
| if err != nil { | ||
| log.Errorf("commit failed, db group: %s, err: %v", group, err) | ||
| return err | ||
| } | ||
| log.Debugf("DBGroup %s has committed local transaction!", group) | ||
| return nil | ||
| }) | ||
| } | ||
|
|
||
| if err := g.Wait(); err != nil { | ||
| return nil, err | ||
| } | ||
| return &mysql.Result{ | ||
| AffectedRows: 0, | ||
| InsertId: 0, | ||
| }, nil | ||
| } | ||
|
|
||
| func (tx *ComplexTx) Rollback(ctx context.Context) (result proto.Result, err error) { | ||
| spanCtx, span := tracing.GetTraceSpan(ctx, tracing.GroupTxCommit) | ||
| defer span.End() | ||
|
|
||
| if tx.closed.Load() { | ||
| return nil, err2.ErrTransactionClosed | ||
| } | ||
| defer tx.Close() | ||
|
|
||
| var g errgroup.Group | ||
| for group, child := range tx.txs { | ||
| group, child := group, child | ||
| g.Go(func() error { | ||
| _, err := child.Rollback(spanCtx, nil) | ||
| if err != nil { | ||
| log.Errorf("rollback failed, db group: %s, err: %v", group, err) | ||
| return err | ||
| } | ||
| log.Debugf("DBGroup %s has rollbacked local transaction!", group) | ||
| return nil | ||
| }) | ||
| } | ||
|
|
||
| if err := g.Wait(); err != nil { | ||
| return nil, err | ||
| } | ||
| return &mysql.Result{ | ||
| AffectedRows: 0, | ||
| InsertId: 0, | ||
| }, nil | ||
| } | ||
|
|
||
| func (tx *ComplexTx) Close() { | ||
| tx.closed.Swap(true) | ||
| tx.txs = nil | ||
| } |
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