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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>
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@ -18,6 +18,9 @@ func TestPersistableChannelQueue(t *testing.T) {
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handleChan := make(chan *testData)
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handle := func(data ...Data) {
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for _, datum := range data {
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if datum == nil {
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continue
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}
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testDatum := datum.(*testData)
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handleChan <- testDatum
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}
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@ -42,13 +45,26 @@ func TestPersistableChannelQueue(t *testing.T) {
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}, &testData{})
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assert.NoError(t, err)
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readyForShutdown := make(chan struct{})
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readyForTerminate := make(chan struct{})
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go queue.Run(func(shutdown func()) {
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lock.Lock()
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defer lock.Unlock()
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select {
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case <-readyForShutdown:
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default:
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close(readyForShutdown)
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}
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queueShutdown = append(queueShutdown, shutdown)
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}, func(terminate func()) {
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lock.Lock()
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defer lock.Unlock()
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select {
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case <-readyForTerminate:
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default:
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close(readyForTerminate)
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}
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queueTerminate = append(queueTerminate, terminate)
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})
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@ -74,6 +90,7 @@ func TestPersistableChannelQueue(t *testing.T) {
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err = queue.Push(test1)
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assert.Error(t, err)
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<-readyForShutdown
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// Now shutdown the queue
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lock.Lock()
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callbacks := make([]func(), len(queueShutdown))
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@ -97,6 +114,7 @@ func TestPersistableChannelQueue(t *testing.T) {
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}
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// terminate the queue
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<-readyForTerminate
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lock.Lock()
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callbacks = make([]func(), len(queueTerminate))
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copy(callbacks, queueTerminate)
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@ -123,13 +141,26 @@ func TestPersistableChannelQueue(t *testing.T) {
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}, &testData{})
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assert.NoError(t, err)
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readyForShutdown = make(chan struct{})
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readyForTerminate = make(chan struct{})
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go queue.Run(func(shutdown func()) {
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lock.Lock()
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defer lock.Unlock()
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select {
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case <-readyForShutdown:
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default:
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close(readyForShutdown)
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}
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queueShutdown = append(queueShutdown, shutdown)
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}, func(terminate func()) {
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lock.Lock()
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defer lock.Unlock()
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select {
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case <-readyForTerminate:
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default:
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close(readyForTerminate)
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}
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queueTerminate = append(queueTerminate, terminate)
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})
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@ -141,6 +172,7 @@ func TestPersistableChannelQueue(t *testing.T) {
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assert.Equal(t, test2.TestString, result4.TestString)
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assert.Equal(t, test2.TestInt, result4.TestInt)
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<-readyForShutdown
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lock.Lock()
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callbacks = make([]func(), len(queueShutdown))
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copy(callbacks, queueShutdown)
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@ -148,6 +180,7 @@ func TestPersistableChannelQueue(t *testing.T) {
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for _, callback := range callbacks {
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callback()
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}
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<-readyForTerminate
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lock.Lock()
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callbacks = make([]func(), len(queueTerminate))
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copy(callbacks, queueTerminate)
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