fix aeraki memory leak when node info update

internal/controller/istio/controller.go

@@ -84,10 +84,6 @@ func (c *Controller) Run(stop <-chan struct{}) {
 	go c.configCache.Run(stop)
 	go func() {
 		c.connectIstio()
-		for {
-			time.Sleep(30 * time.Minute)
-			c.reconnectIstio()
-		}
 	}()
 }
 
@@ -125,9 +121,10 @@ func (c *Controller) connectIstio() {
 			sm, err := c.newSecretManager()
 			if err != nil {
 				controllerLog.Errorf("failed to create SecretManager %s %v", c.options.IstiodAddr, err)
-			} else {
-				config.SecretManager = sm
+				time.Sleep(5 * time.Second)
+				continue
 			}
+			config.SecretManager = sm
 		}
 		c.xdsMCP, err = adsc.New(c.options.IstiodAddr, &config)
 		if err != nil {
@@ -139,6 +136,7 @@ func (c *Controller) connectIstio() {
 		c.xdsMCP.Store = configController
 		if err = c.xdsMCP.Run(); err != nil {
 			controllerLog.Errorf("adsc: failed running %v", err)
+			c.closeConnection()
 			time.Sleep(5 * time.Second)
 			continue
 		}

internal/xds/cache_mgr.go

@@ -455,6 +455,10 @@ func (c *CacheMgr) initNode(_ string) {
 	c.pushChannel <- istiomodel.EventUpdate
 }
 
+func (c *CacheMgr) clearNode(node string) {
+	c.routeCache.ClearSnapshot(node)
+}
+
 func (c *CacheMgr) hasNode(node string) bool {
 	if _, err := c.routeCache.GetSnapshot(node); err != nil {
 		return false

internal/xds/callbacks.go

@@ -47,6 +47,7 @@ func (cb *callbacks) OnStreamOpen(_ context.Context, id int64, typ string) error
 }
 func (cb *callbacks) OnStreamClosed(id int64, node *core.Node) {
 	xdsLog.Infof("node %s stream %d closed\n", node.Id, id)
+	cb.cacheMgr.clearNode(node.Id)
 }
 
 func (cb *callbacks) OnDeltaStreamOpen(_ context.Context, id int64, typ string) error {

internal/xds/server.go

@@ -35,6 +35,7 @@ type cacheMgr interface {
 	initNode(node string)
 	hasNode(node string) bool
 	cache() cachev3.SnapshotCache
+	clearNode(node string)
 }
 
 // Server serves xDS resources to Envoy sidecars