Move hasSynced interface and its implementations to *_test.go files.

Signed-off-by: Yecheng Fu <cofyc.jackson@gmail.com>

discovery/kubernetes/kubernetes.go

@@ -256,27 +256,6 @@ func New(l log.Logger, conf *SDConfig) (*Discovery, error) {
 
 const resyncPeriod = 10 * time.Minute
 
-type hasSynced interface {
-	// hasSynced returns true if all informers' store has synced.
-	// This is only used in testing to determine when the cache stores have synced.
-	hasSynced() bool
-}
-
-var _ hasSynced = &Discovery{}
-
-func (d *Discovery) hasSynced() bool {
-	d.RLock()
-	defer d.RUnlock()
-	for _, discoverer := range d.discoverers {
-		if hasSynceddiscoverer, ok := discoverer.(hasSynced); ok {
-			if !hasSynceddiscoverer.hasSynced() {
-				return false
-			}
-		}
-	}
-	return true
-}
-
 // Run implements the discoverer interface.
 func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 	d.Lock()

discovery/kubernetes/kubernetes_test.go

@@ -119,12 +119,15 @@ func (d k8sDiscoveryTest) Run(t *testing.T) {
 	resChan := make(chan map[string]*targetgroup.Group)
 	go readResultWithoutTimeout(t, ch, d.expectedMaxItems, time.Second, resChan)
 
-	if dd, ok := d.discovery.(hasSynced); ok {
+	dd, ok := d.discovery.(hasSynced)
+	if !ok {
+		t.Errorf("discoverer does not implement hasSynced interface")
+		return
+	}
 	if !cache.WaitForCacheSync(ctx.Done(), dd.hasSynced) {
 		t.Errorf("discoverer failed to sync: %v", dd)
 		return
 	}
-	}
 
 	if d.afterStart != nil {
 		d.afterStart()
@@ -184,3 +187,49 @@ func requireTargetGroups(t *testing.T, expected, res map[string]*targetgroup.Gro
 
 	require.JSONEq(t, string(b1), string(b2))
 }
+
+type hasSynced interface {
+	// hasSynced returns true if all informers' store has synced.
+	// This is only used in testing to determine when the cache stores have synced.
+	hasSynced() bool
+}
+
+var _ hasSynced = &Discovery{}
+var _ hasSynced = &Node{}
+var _ hasSynced = &Endpoints{}
+var _ hasSynced = &Ingress{}
+var _ hasSynced = &Pod{}
+var _ hasSynced = &Service{}
+
+func (d *Discovery) hasSynced() bool {
+	d.RLock()
+	defer d.RUnlock()
+	for _, discoverer := range d.discoverers {
+		if hasSynceddiscoverer, ok := discoverer.(hasSynced); ok {
+			if !hasSynceddiscoverer.hasSynced() {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+func (n *Node) hasSynced() bool {
+	return n.informer.HasSynced()
+}
+
+func (e *Endpoints) hasSynced() bool {
+	return e.endpointsInf.HasSynced() && e.serviceInf.HasSynced() && e.podInf.HasSynced()
+}
+
+func (i *Ingress) hasSynced() bool {
+	return i.informer.HasSynced()
+}
+
+func (p *Pod) hasSynced() bool {
+	return p.informer.HasSynced()
+}
+
+func (s *Service) hasSynced() bool {
+	return s.informer.HasSynced()
+}

discovery/kubernetes/node.go

@@ -39,7 +39,6 @@ type Node struct {
 }
 
 var _ discoverer = &Node{}
-var _ hasSynced = &Node{}
 
 // NewNode returns a new node discovery.
 func NewNode(l log.Logger, inf cache.SharedInformer) *Node {
@@ -73,10 +72,6 @@ func (e *Node) enqueue(obj interface{}) {
 	e.queue.Add(key)
 }
 
-func (n *Node) hasSynced() bool {
-	return n.informer.HasSynced()
-}
-
 // Run implements the Discoverer interface.
 func (n *Node) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 	defer n.queue.ShutDown()