go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/gae/filter/txnBuf/race_test.go (about)

     1  // Copyright 2015 The LUCI Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package txnBuf
    16  
    17  import (
    18  	"context"
    19  	"fmt"
    20  	"sync"
    21  	"testing"
    22  
    23  	"go.chromium.org/luci/gae/impl/memory"
    24  	ds "go.chromium.org/luci/gae/service/datastore"
    25  )
    26  
    27  type Counter struct {
    28  	ID int64 `gae:"$id"`
    29  
    30  	Value int64
    31  }
    32  
    33  func TestRace(t *testing.T) {
    34  	t.Parallel()
    35  
    36  	c := FilterRDS(memory.Use(context.Background()))
    37  
    38  	wg := sync.WaitGroup{}
    39  	for i := 0; i < 100; i++ {
    40  		id := int64(i + 1)
    41  
    42  		wg.Add(1)
    43  		go func() {
    44  			defer wg.Done()
    45  			err := ds.RunInTransaction(c, func(c context.Context) error {
    46  				for i := 0; i < 100; i++ {
    47  					err := ds.RunInTransaction(c, func(c context.Context) error {
    48  						ctr := &Counter{ID: id}
    49  						if err := ds.Get(c, ctr); err != nil && err != ds.ErrNoSuchEntity {
    50  							panic(fmt.Sprintf("bad Get: %s", err))
    51  						}
    52  						ctr.Value++
    53  						return ds.Put(c, ctr)
    54  					}, nil)
    55  					if err != nil {
    56  						panic(fmt.Sprintf("bad inner RIT: %s", err))
    57  					}
    58  				}
    59  
    60  				return nil
    61  			}, nil)
    62  			if err != nil {
    63  				panic(fmt.Sprintf("bad outer RIT: %s", err))
    64  			}
    65  		}()
    66  	}
    67  	wg.Wait()
    68  }