Update tap targets over ws (#901)

Update tappers via websocket instead of by env var. This way the DaemonSet doesn't have to be applied just to notify the tappers that the tap targets changed. The number of tapper restarts is reduced. The DaemonSet still gets applied when there is a need to add/remove a tapper from a node.

agent/pkg/providers/tappedPods/tapped_pods_provider.go

@@ -14,9 +14,10 @@ import (
 const FilePath = shared.DataDirPath + "tapped-pods.json"
 
 var (
-	lock       = &sync.Mutex{}
-	syncOnce   sync.Once
-	tappedPods []*shared.PodInfo
+	lock                    = &sync.Mutex{}
+	syncOnce                sync.Once
+	tappedPods              []*shared.PodInfo
+	nodeHostToTappedPodsMap shared.NodeToPodsMap
 )
 
 func Get() []*shared.PodInfo {
@@ -55,3 +56,14 @@ func GetTappedPodsStatus() []shared.TappedPodStatus {
 
 	return tappedPodsStatus
 }
+
+func SetNodeToTappedPodMap(nodeToTappedPodsMap shared.NodeToPodsMap) {
+	summary := nodeToTappedPodsMap.Summary()
+	logger.Log.Infof("Setting node to tapped pods map to %v", summary)
+
+	nodeHostToTappedPodsMap = nodeToTappedPodsMap
+}
+
+func GetNodeToTappedPodMap() shared.NodeToPodsMap {
+	return nodeHostToTappedPodsMap
+}