[ws-manager-bridge] improve error handling for workspace cluster registration and update

Prevent duplicate workspace cluster registration & improve error message for update when workspace cluster doesn't exist

Author: kylos101

components/ws-manager-bridge/src/cluster-service-server.ts

@@ -70,21 +70,22 @@ export class ClusterService implements IClusterServiceServer {
             try {
                 // check if the name or URL are already registered/in use
                 const req = call.request.toObject();
-                await Promise.all([
-                    async () => {
-                        const oldCluster = await this.clusterDB.findByName(req.name);
-                        if (!oldCluster) {
-                            throw new GRPCError(grpc.status.ALREADY_EXISTS, `a WorkspaceCluster with name ${req.name} already exists in the DB`);
-                        }
-                    },
-                    async () => {
-                        const oldCluster = await this.clusterDB.findFiltered({ url: req.url });
-                        if (!oldCluster) {
-                            throw new GRPCError(grpc.status.ALREADY_EXISTS, `a WorkspaceCluster with url ${req.url} already exists in the DB`);
-                        }
-                    }
+
+                const clusterByNamePromise = this.clusterDB.findByName(req.name);
+                const clusterByUrlPromise = this.clusterDB.findFiltered({ url: req.url })
+
+                const [clusterByName, clusterByUrl] = await Promise.all([
+                    clusterByNamePromise,
+                    clusterByUrlPromise
                 ]);
 
+                if (!!clusterByName) {
+                    throw new GRPCError(grpc.status.ALREADY_EXISTS, `a WorkspaceCluster with name ${req.name} already exists in the DB`);
+                }
+                if (Array.isArray(clusterByUrl) && clusterByUrl.length > 0) {
+                    throw new GRPCError(grpc.status.ALREADY_EXISTS, `a WorkspaceCluster with url ${req.url} already exists in the DB`);
+                }
+
                 // store the ws-manager into the database
                 let perfereability = Preferability.NONE;
                 let govern = false;
@@ -154,7 +155,7 @@ export class ClusterService implements IClusterServiceServer {
                 const req = call.request.toObject();
                 const cluster = await this.clusterDB.findByName(req.name);
                 if (!cluster) {
-                    throw new GRPCError(grpc.status.ALREADY_EXISTS, `a WorkspaceCluster with name ${req.name} already exists in the DB!`);
+                    throw new GRPCError(grpc.status.NOT_FOUND, `a WorkspaceCluster with name ${req.name} does not exist in the DB!`);
                 }
 
                 if (call.request.hasMaxScore()) {