Added Error field in Payload and Subscriber restart on connection failure (#1958)

This PR has the following commits:
- Added Error check for graphql cluster-connect errors
- Restart Subscriber on Connection Failure

Signed-off-by: Soumya Ghosh Dastidar <gdsoumya@gmail.com>

litmus-portal/backend/graphql-server/graph/schema.resolvers.go

@@ -100,6 +100,7 @@ func (r *subscriptionResolver) ClusterConnect(ctx context.Context, clusterInfo m
 	clusterAction := make(chan *model.ClusterAction, 1)
 	verifiedCluster, err := cluster.VerifyCluster(clusterInfo)
 	if err != nil {
+		log.Print("VALIDATION FAILED : ", clusterInfo.ClusterID)
 		return clusterAction, err
 	}
 
@@ -110,7 +111,6 @@ func (r *subscriptionResolver) ClusterConnect(ctx context.Context, clusterInfo m
 	}
 	store.ConnectedCluster[clusterInfo.ClusterID] = clusterAction
 	store.Mutex.Unlock()
-
 	go func() {
 		<-ctx.Done()
 		verifiedCluster.IsActive = false

litmus-portal/backend/subscriber/pkg/gql/subscriptions.go

@@ -55,8 +55,7 @@ func ClusterConnect(clusterData map[string]string) {
 	for {
 		_, message, err := c.ReadMessage()
 		if err != nil {
-			log.Println("read:", err)
-			return
+			log.Fatal("SUBSCRIPTION ERROR : ", err)
 		}
 		var r types.RawData
 		err = json.Unmarshal(message, &r)
@@ -69,6 +68,10 @@ func ClusterConnect(clusterData map[string]string) {
 		if r.Type != "data" {
 			continue
 		}
+		if r.Payload.Errors != nil {
+			log.Fatal("ERROR: ", string(message))
+		}
+
 		if strings.ToLower(r.Payload.Data.ClusterConnect.Action.RequestType) == "logs" {
 			podRequest := types.PodLogRequest{
 				RequestID: r.Payload.Data.ClusterConnect.ProjectID,
@@ -80,7 +83,7 @@ func ClusterConnect(clusterData map[string]string) {
 			// send pod logs
 			logrus.Print("LOG REQUEST ", podRequest)
 			SendPodLogs(clusterData, podRequest)
-		} else {
+		} else if strings.Index("create update delete get", strings.ToLower(r.Payload.Data.ClusterConnect.Action.RequestType)) >= 0 {
 			logrus.Print("WORKFLOW REQUEST ", r.Payload.Data.ClusterConnect.Action)
 			_, err = operations.ClusterOperations(r.Payload.Data.ClusterConnect.Action.K8SManifest, r.Payload.Data.ClusterConnect.Action.RequestType)
 			if err != nil {

litmus-portal/backend/subscriber/pkg/types/connect.go

@@ -14,7 +14,8 @@ type RawData struct {
 }
 
 type Payload struct {
-	Data Data `json:"data"`
+	Errors interface{} `json:"errors"`
+	Data   Data        `json:"data"`
 }
 
 type Data struct {