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forgejo/modules/queue/queue_disk_channel_test.go
zeripath a85e75b2b1
Prevent deadlock in TestPersistableChannelQueue (#17717)
* Prevent deadlock in TestPersistableChannelQueue

There is a potential deadlock in TestPersistableChannelQueue due to attempting to
shutdown the test queue before it is ready.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* prevent npe

Signed-off-by: Andrew Thornton <art27@cantab.net>
2021-11-19 01:13:25 +00:00

192 lines
4.2 KiB
Go

// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package queue
import (
"os"
"sync"
"testing"
"code.gitea.io/gitea/modules/util"
"github.com/stretchr/testify/assert"
)
func TestPersistableChannelQueue(t *testing.T) {
handleChan := make(chan *testData)
handle := func(data ...Data) {
for _, datum := range data {
if datum == nil {
continue
}
testDatum := datum.(*testData)
handleChan <- testDatum
}
}
lock := sync.Mutex{}
queueShutdown := []func(){}
queueTerminate := []func(){}
tmpDir, err := os.MkdirTemp("", "persistable-channel-queue-test-data")
assert.NoError(t, err)
defer util.RemoveAll(tmpDir)
queue, err := NewPersistableChannelQueue(handle, PersistableChannelQueueConfiguration{
DataDir: tmpDir,
BatchLength: 2,
QueueLength: 20,
Workers: 1,
BoostWorkers: 0,
MaxWorkers: 10,
Name: "first",
}, &testData{})
assert.NoError(t, err)
readyForShutdown := make(chan struct{})
readyForTerminate := make(chan struct{})
go queue.Run(func(shutdown func()) {
lock.Lock()
defer lock.Unlock()
select {
case <-readyForShutdown:
default:
close(readyForShutdown)
}
queueShutdown = append(queueShutdown, shutdown)
}, func(terminate func()) {
lock.Lock()
defer lock.Unlock()
select {
case <-readyForTerminate:
default:
close(readyForTerminate)
}
queueTerminate = append(queueTerminate, terminate)
})
test1 := testData{"A", 1}
test2 := testData{"B", 2}
err = queue.Push(&test1)
assert.NoError(t, err)
go func() {
err := queue.Push(&test2)
assert.NoError(t, err)
}()
result1 := <-handleChan
assert.Equal(t, test1.TestString, result1.TestString)
assert.Equal(t, test1.TestInt, result1.TestInt)
result2 := <-handleChan
assert.Equal(t, test2.TestString, result2.TestString)
assert.Equal(t, test2.TestInt, result2.TestInt)
// test1 is a testData not a *testData so will be rejected
err = queue.Push(test1)
assert.Error(t, err)
<-readyForShutdown
// Now shutdown the queue
lock.Lock()
callbacks := make([]func(), len(queueShutdown))
copy(callbacks, queueShutdown)
lock.Unlock()
for _, callback := range callbacks {
callback()
}
// Wait til it is closed
<-queue.(*PersistableChannelQueue).closed
err = queue.Push(&test1)
assert.NoError(t, err)
err = queue.Push(&test2)
assert.NoError(t, err)
select {
case <-handleChan:
assert.Fail(t, "Handler processing should have stopped")
default:
}
// terminate the queue
<-readyForTerminate
lock.Lock()
callbacks = make([]func(), len(queueTerminate))
copy(callbacks, queueTerminate)
lock.Unlock()
for _, callback := range callbacks {
callback()
}
select {
case <-handleChan:
assert.Fail(t, "Handler processing should have stopped")
default:
}
// Reopen queue
queue, err = NewPersistableChannelQueue(handle, PersistableChannelQueueConfiguration{
DataDir: tmpDir,
BatchLength: 2,
QueueLength: 20,
Workers: 1,
BoostWorkers: 0,
MaxWorkers: 10,
Name: "second",
}, &testData{})
assert.NoError(t, err)
readyForShutdown = make(chan struct{})
readyForTerminate = make(chan struct{})
go queue.Run(func(shutdown func()) {
lock.Lock()
defer lock.Unlock()
select {
case <-readyForShutdown:
default:
close(readyForShutdown)
}
queueShutdown = append(queueShutdown, shutdown)
}, func(terminate func()) {
lock.Lock()
defer lock.Unlock()
select {
case <-readyForTerminate:
default:
close(readyForTerminate)
}
queueTerminate = append(queueTerminate, terminate)
})
result3 := <-handleChan
assert.Equal(t, test1.TestString, result3.TestString)
assert.Equal(t, test1.TestInt, result3.TestInt)
result4 := <-handleChan
assert.Equal(t, test2.TestString, result4.TestString)
assert.Equal(t, test2.TestInt, result4.TestInt)
<-readyForShutdown
lock.Lock()
callbacks = make([]func(), len(queueShutdown))
copy(callbacks, queueShutdown)
lock.Unlock()
for _, callback := range callbacks {
callback()
}
<-readyForTerminate
lock.Lock()
callbacks = make([]func(), len(queueTerminate))
copy(callbacks, queueTerminate)
lock.Unlock()
for _, callback := range callbacks {
callback()
}
}