Add caches for cross node resource groups and unmanaged nodes.

pkg/cloudprovider/providers/azure/azure.go

@@ -58,6 +58,9 @@ const (
 
 	loadBalancerSkuBasic    = "basic"
 	loadBalancerSkuStandard = "standard"
+
+	externalResourceGroupLabel = "kubernetes.azure.com/resource-group"
+	managedByAzureLabel        = "kubernetes.azure.com/managed"
 )
 
 var (
@@ -156,11 +159,16 @@ type Cloud struct {
 	metadata                *InstanceMetadata
 	vmSet                   VMSet
 
-	// Lock for access to nodeZones
-	nodeZonesLock sync.Mutex
+	// Lock for access to node caches
+	nodeCachesLock sync.Mutex
 	// nodeZones is a mapping from Zone to a sets.String of Node's names in the Zone
 	// it is updated by the nodeInformer
-	nodeZones          map[string]sets.String
+	nodeZones map[string]sets.String
+	// nodeResourceGroups holds nodes external resource groups
+	nodeResourceGroups map[string]string
+	// unmanagedNodes holds a list of nodes not managed by Azure cloud provider.
+	unmanagedNodes sets.String
+	// nodeInformerSynced is for determining if the informer has synced.
 	nodeInformerSynced cache.InformerSynced
 
 	// Clients for vmss.
@@ -254,9 +262,11 @@ func NewCloud(configReader io.Reader) (cloudprovider.Interface, error) {
 		rateLimiterWriter:       operationPollRateLimiterWrite,
 	}
 	az := Cloud{
-		Config:      *config,
-		Environment: *env,
-		nodeZones:   map[string]sets.String{},
+		Config:             *config,
+		Environment:        *env,
+		nodeZones:          map[string]sets.String{},
+		nodeResourceGroups: map[string]string{},
+		unmanagedNodes:     sets.NewString(),
 
 		DisksClient:                     newAzDisksClient(azClientConfig),
 		RoutesClient:                    newAzRoutesClient(azClientConfig),
@@ -294,7 +304,7 @@ func NewCloud(configReader io.Reader) (cloudprovider.Interface, error) {
 			Duration: time.Duration(az.CloudProviderBackoffDuration) * time.Second,
 			Jitter:   az.CloudProviderBackoffJitter,
 		}
-		glog.V(2).Infof("Azure cloudprovider using retry backoff: retries=%d, exponent=%f, duration=%d, jitter=%f",
+		glog.V(2).Infof("Azure cloudprovider using try backoff: retries=%d, exponent=%f, duration=%d, jitter=%f",
 			az.CloudProviderBackoffRetries,
 			az.CloudProviderBackoffExponent,
 			az.CloudProviderBackoffDuration,
@@ -449,7 +459,7 @@ func (az *Cloud) SetInformers(informerFactory informers.SharedInformerFactory) {
 	nodeInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
 		AddFunc: func(obj interface{}) {
 			node := obj.(*v1.Node)
-			az.updateNodeZones(nil, node)
+			az.updateNodeCaches(nil, node)
 		},
 		UpdateFunc: func(prev, obj interface{}) {
 			prevNode := prev.(*v1.Node)
@@ -458,7 +468,7 @@ func (az *Cloud) SetInformers(informerFactory informers.SharedInformerFactory) {
 				prevNode.Labels[kubeletapis.LabelZoneFailureDomain] {
 				return
 			}
-			az.updateNodeZones(prevNode, newNode)
+			az.updateNodeCaches(prevNode, newNode)
 		},
 		DeleteFunc: func(obj interface{}) {
 			node, isNode := obj.(*v1.Node)
@@ -476,16 +486,19 @@ func (az *Cloud) SetInformers(informerFactory informers.SharedInformerFactory) {
 					return
 				}
 			}
-			az.updateNodeZones(node, nil)
+			az.updateNodeCaches(node, nil)
 		},
 	})
 	az.nodeInformerSynced = nodeInformer.HasSynced
 }
 
-func (az *Cloud) updateNodeZones(prevNode, newNode *v1.Node) {
-	az.nodeZonesLock.Lock()
-	defer az.nodeZonesLock.Unlock()
+// updateNodeCaches updates local cache for node's zones and external resource groups.
+func (az *Cloud) updateNodeCaches(prevNode, newNode *v1.Node) {
+	az.nodeCachesLock.Lock()
+	defer az.nodeCachesLock.Unlock()
+
 	if prevNode != nil {
+		// Remove from nodeZones cache.
 		prevZone, ok := prevNode.ObjectMeta.Labels[kubeletapis.LabelZoneFailureDomain]
 		if ok && az.isAvailabilityZone(prevZone) {
 			az.nodeZones[prevZone].Delete(prevNode.ObjectMeta.Name)
@@ -493,8 +506,22 @@ func (az *Cloud) updateNodeZones(prevNode, newNode *v1.Node) {
 				az.nodeZones[prevZone] = nil
 			}
 		}
+
+		// Remove from nodeResourceGroups cache.
+		_, ok = prevNode.ObjectMeta.Labels[externalResourceGroupLabel]
+		if ok {
+			delete(az.nodeResourceGroups, prevNode.ObjectMeta.Name)
+		}
+
+		// Remove from unmanagedNodes cache.
+		managed, ok := prevNode.ObjectMeta.Labels[managedByAzureLabel]
+		if ok && managed == "false" {
+			az.unmanagedNodes.Delete(prevNode.ObjectMeta.Name)
+		}
 	}
+
 	if newNode != nil {
+		// Add to nodeZones cache.
 		newZone, ok := newNode.ObjectMeta.Labels[kubeletapis.LabelZoneFailureDomain]
 		if ok && az.isAvailabilityZone(newZone) {
 			if az.nodeZones[newZone] == nil {
@@ -502,6 +529,18 @@ func (az *Cloud) updateNodeZones(prevNode, newNode *v1.Node) {
 			}
 			az.nodeZones[newZone].Insert(newNode.ObjectMeta.Name)
 		}
+
+		// Add to nodeResourceGroups cache.
+		newRG, ok := newNode.ObjectMeta.Labels[externalResourceGroupLabel]
+		if ok && len(newRG) > 0 {
+			az.nodeResourceGroups[newNode.ObjectMeta.Name] = newRG
+		}
+
+		// Add to unmanagedNodes cache.
+		managed, ok := newNode.ObjectMeta.Labels[managedByAzureLabel]
+		if ok && managed == "false" {
+			az.unmanagedNodes.Insert(newNode.ObjectMeta.Name)
+		}
 	}
 }
 
@@ -511,8 +550,8 @@ func (az *Cloud) GetActiveZones() (sets.String, error) {
 		return nil, fmt.Errorf("Azure cloud provider doesn't have informers set")
 	}
 
-	az.nodeZonesLock.Lock()
-	defer az.nodeZonesLock.Unlock()
+	az.nodeCachesLock.Lock()
+	defer az.nodeCachesLock.Unlock()
 	if !az.nodeInformerSynced() {
 		return nil, fmt.Errorf("node informer is not synced when trying to GetActiveZones")
 	}
@@ -530,3 +569,76 @@ func (az *Cloud) GetActiveZones() (sets.String, error) {
 func (az *Cloud) GetLocation() string {
 	return az.Location
 }
+
+// GetNodeResourceGroup gets resource group for given node.
+func (az *Cloud) GetNodeResourceGroup(nodeName string) (string, error) {
+	// Kubelet won't set az.nodeInformerSynced, always return configured resourceGroup.
+	if az.nodeInformerSynced == nil {
+		return az.ResourceGroup, nil
+	}
+
+	az.nodeCachesLock.Lock()
+	defer az.nodeCachesLock.Unlock()
+	if !az.nodeInformerSynced() {
+		return "", fmt.Errorf("node informer is not synced when trying to GetNodeResourceGroup")
+	}
+
+	// Return external resource group if it has been cached.
+	if cachedRG, ok := az.nodeResourceGroups[nodeName]; ok {
+		return cachedRG, nil
+	}
+
+	// Return resource group from cloud provider options.
+	return az.ResourceGroup, nil
+}
+
+// GetResourceGroups returns a set of resource groups that all nodes are running on.
+func (az *Cloud) GetResourceGroups() (sets.String, error) {
+	// Kubelet won't set az.nodeInformerSynced, always return configured resourceGroup.
+	if az.nodeInformerSynced == nil {
+		return sets.NewString(az.ResourceGroup), nil
+	}
+
+	az.nodeCachesLock.Lock()
+	defer az.nodeCachesLock.Unlock()
+	if !az.nodeInformerSynced() {
+		return nil, fmt.Errorf("node informer is not synced when trying to GetResourceGroups")
+	}
+
+	resourceGroups := sets.NewString(az.ResourceGroup)
+	for _, rg := range az.nodeResourceGroups {
+		resourceGroups.Insert(rg)
+	}
+
+	return resourceGroups, nil
+}
+
+// GetUnmanagedNodes returns a list of nodes not managed by Azure cloud provider (e.g. on-prem nodes).
+func (az *Cloud) GetUnmanagedNodes() (sets.String, error) {
+	// Kubelet won't set az.nodeInformerSynced, always return nil.
+	if az.nodeInformerSynced == nil {
+		return nil, nil
+	}
+
+	az.nodeCachesLock.Lock()
+	defer az.nodeCachesLock.Unlock()
+	if !az.nodeInformerSynced() {
+		return nil, fmt.Errorf("node informer is not synced when trying to GetUnmanagedNodes")
+	}
+
+	return sets.NewString(az.unmanagedNodes.List()...), nil
+}
+
+// ShouldNodeExcludedFromLoadBalancer returns true if node is unmanaged or in external resource group.
+func (az *Cloud) ShouldNodeExcludedFromLoadBalancer(node *v1.Node) bool {
+	labels := node.ObjectMeta.Labels
+	if rg, ok := labels[externalResourceGroupLabel]; ok && rg != az.ResourceGroup {
+		return true
+	}
+
+	if managed, ok := labels[managedByAzureLabel]; ok && managed == "false" {
+		return true
+	}
+
+	return false
+}