func TestHammerController(t *testing.T) {
// This test executes a bunch of requests through the fake source and
// controller framework to make sure there's no locking/threading
// errors. If an error happens, it should hang forever or trigger the
// race detector.
// source simulates an apiserver object endpoint.
source := fcache.NewFakeControllerSource()
// Let's do threadsafe output to get predictable test results.
outputSetLock := sync.Mutex{}
// map of key to operations done on the key
outputSet := map[string][]string{}
recordFunc := func(eventType string, obj interface{}) {
key, err := DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
t.Errorf("something wrong with key: %v", err)
key = "oops something went wrong with the key"
}
// Record some output when items are deleted.
outputSetLock.Lock()
defer outputSetLock.Unlock()
outputSet[key] = append(outputSet[key], eventType)
}
// Make a controller which just logs all the changes it gets.
_, controller := NewInformer(
source,
&v1.Pod{},
time.Millisecond*100,
ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) { recordFunc("add", obj) },
UpdateFunc: func(oldObj, newObj interface{}) { recordFunc("update", newObj) },
DeleteFunc: func(obj interface{}) { recordFunc("delete", obj) },
},
)
if controller.HasSynced() {
t.Errorf("Expected HasSynced() to return false before we started the controller")
}
// Run the controller and run it until we close stop.
stop := make(chan struct{})
go controller.Run(stop)
// Let's wait for the controller to do its initial sync
wait.Poll(100*time.Millisecond, wait.ForeverTestTimeout, func() (bool, error) {
return controller.HasSynced(), nil
})
if !controller.HasSynced() {
t.Errorf("Expected HasSynced() to return true after the initial sync")
}
wg := sync.WaitGroup{}
const threads = 3
wg.Add(threads)
for i := 0; i < threads; i++ {
go func() {
defer wg.Done()
// Let's add a few objects to the source.
currentNames := sets.String{}
rs := rand.NewSource(rand.Int63())
f := fuzz.New().NilChance(.5).NumElements(0, 2).RandSource(rs)
r := rand.New(rs) // Mustn't use r and f concurrently!
for i := 0; i < 100; i++ {
var name string
var isNew bool
if currentNames.Len() == 0 || r.Intn(3) == 1 {
f.Fuzz(&name)
isNew = true
} else {
l := currentNames.List()
name = l[r.Intn(len(l))]
}
pod := &v1.Pod{}
f.Fuzz(pod)
pod.ObjectMeta.Name = name
pod.ObjectMeta.Namespace = "default"
// Add, update, or delete randomly.
// Note that these pods are not valid-- the fake source doesn't
// call validation or perform any other checking.
if isNew {
currentNames.Insert(name)
source.Add(pod)
continue
}
switch r.Intn(2) {
case 0:
currentNames.Insert(name)
source.Modify(pod)
case 1:
currentNames.Delete(name)
source.Delete(pod)
}
}
}()
}
wg.Wait()
// Let's wait for the controller to finish processing the things we just added.
// TODO: look in the queue to see how many items need to be processed.
time.Sleep(100 * time.Millisecond)
close(stop)
// TODO: Verify that no goroutines were leaked here and that everything shut
// down cleanly.
outputSetLock.Lock()
t.Logf("got: %#v", outputSet)
}