Use endpoints from Broker while validating overlapping CIDRs

As part of the following PR[1], we no longer sync an endpoint
from the Broker if the endpoint has any overlapping CIDRs with the
local cluster. This was done to avoid issues on the Gateway node.
Consequently, the subctl diagnose code should ideally examine
the endpoints on Broker when validating overlapping CIDRs instead
of inspecting the endpoints on the local cluster. This PR addresses
this issue.

[1] submariner-io/submariner#2263

Signed-off-by: Sridhar Gaddam <[email protected]>

pkg/diagnose/deployments.go

@@ -20,10 +20,11 @@ package diagnose
 
 import (
 	"context"
-
 	"github.com/submariner-io/admiral/pkg/reporter"
 	"github.com/submariner-io/subctl/internal/constants"
+	"github.com/submariner-io/subctl/internal/restconfig"
 	"github.com/submariner-io/subctl/pkg/cluster"
+	"github.com/submariner-io/submariner-operator/pkg/client"
 	"github.com/submariner-io/submariner/pkg/cidr"
 	"github.com/submariner-io/submariner/pkg/cni"
 	v1 "k8s.io/api/core/v1"
@@ -45,7 +46,19 @@ func checkOverlappingCIDRs(clusterInfo *cluster.Info, status reporter.Interface)
 
 	defer status.End()
 
-	endpointList, err := clusterInfo.ClientProducer.ForSubmariner().SubmarinerV1().Endpoints(clusterInfo.Submariner.Namespace).List(
+	brokerRestConfig, brokerNamespace, err := restconfig.ForBroker(clusterInfo.Submariner, nil)
+	if err != nil {
+		status.Failure("Error getting the Broker's REST config: %v", err)
+		return false
+	}
+
+	clientProducer, err := client.NewProducerFromRestConfig(brokerRestConfig)
+	if err != nil {
+		status.Failure("Error creating broker client Producer: %v", err)
+		return false
+	}
+
+	endpointList, err := clientProducer.ForSubmariner().SubmarinerV1().Endpoints(brokerNamespace).List(
 		context.TODO(), metav1.ListOptions{})
 	if err != nil {
 		status.Failure("Error listing the Submariner endpoints: %v", err)