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/controllers/status_controller.go

@@ -2,6 +2,7 @@ package controllers
 
 import (
 	"net/http"
+	core "k8s.io/api/core/v1"
 
 	"github.com/gin-gonic/gin"
 	"github.com/up9inc/mizu/agent/pkg/api"
@@ -12,6 +13,7 @@ import (
 	"github.com/up9inc/mizu/agent/pkg/up9"
 	"github.com/up9inc/mizu/agent/pkg/validation"
 	"github.com/up9inc/mizu/shared"
+	"github.com/up9inc/mizu/shared/kubernetes"
 	"github.com/up9inc/mizu/shared/logger"
 )
 
@@ -30,15 +32,21 @@ func HealthCheck(c *gin.Context) {
 }
 
 func PostTappedPods(c *gin.Context) {
-	var requestTappedPods []*shared.PodInfo
+	var requestTappedPods []core.Pod
 	if err := c.Bind(&requestTappedPods); err != nil {
 		c.JSON(http.StatusBadRequest, err)
 		return
 	}
 
+	podInfos := kubernetes.GetPodInfosForPods(requestTappedPods)
+
 	logger.Log.Infof("[Status] POST request: %d tapped pods", len(requestTappedPods))
-	tappedPods.Set(requestTappedPods)
+	tappedPods.Set(podInfos)
 	api.BroadcastTappedPodsStatus()
+
+	nodeToTappedPodMap := kubernetes.GetNodeHostToTappedPodsMap(requestTappedPods)
+	tappedPods.SetNodeToTappedPodMap(nodeToTappedPodMap)
+	api.BroadcastTappedPodsToTappers(nodeToTappedPodMap)
 }
 
 func PostTapperStatus(c *gin.Context) {