GKE NodePool support for NAP - get NP/Migs via api - part 1

cluster-autoscaler/cloudprovider/builder/cloud_provider_builder.go

@@ -37,13 +37,15 @@ import (
 type CloudProviderBuilder struct {
 	cloudProviderFlag string
 	cloudConfig       string
+	clusterName       string
 }
 
 // NewCloudProviderBuilder builds a new builder from static settings
-func NewCloudProviderBuilder(cloudProviderFlag string, cloudConfig string) CloudProviderBuilder {
+func NewCloudProviderBuilder(cloudProviderFlag string, cloudConfig string, clusterName string) CloudProviderBuilder {
 	return CloudProviderBuilder{
 		cloudProviderFlag: cloudProviderFlag,
 		cloudConfig:       cloudConfig,
+		clusterName:       clusterName,
 	}
 }
 
@@ -54,19 +56,24 @@ func (b CloudProviderBuilder) Build(discoveryOpts cloudprovider.NodeGroupDiscove
 
 	nodeGroupsFlag := discoveryOpts.NodeGroupSpecs
 
-	if b.cloudProviderFlag == "gce" {
+	if b.cloudProviderFlag == "gce" || b.cloudProviderFlag == "gke" {
 		// GCE Manager
 		var gceManager *gce.GceManager
 		var gceError error
+		mode := gce.ModeGCE
+		if b.cloudProviderFlag == "gke" {
+			mode = gce.ModeGKE
+		}
+
 		if b.cloudConfig != "" {
 			config, fileErr := os.Open(b.cloudConfig)
 			if fileErr != nil {
 				glog.Fatalf("Couldn't open cloud provider configuration %s: %#v", b.cloudConfig, err)
 			}
 			defer config.Close()
-			gceManager, gceError = gce.CreateGceManager(config)
+			gceManager, gceError = gce.CreateGceManager(config, mode, b.clusterName)
 		} else {
-			gceManager, gceError = gce.CreateGceManager(nil)
+			gceManager, gceError = gce.CreateGceManager(nil, mode, b.clusterName)
 		}
 		if gceError != nil {
 			glog.Fatalf("Failed to create GCE Manager: %v", err)

cluster-autoscaler/cloudprovider/gce/gce_cloud_provider.go

@@ -168,6 +168,7 @@ type Mig struct {
 	maxSize         int
 	autoprovisioned bool
 	exist           bool
+	nodePoolName    string
 	spec            *autoprovisioningSpec
 }
 

cluster-autoscaler/cloudprovider/gce/gce_manager.go

@@ -30,13 +30,26 @@ import (
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"
 	gce "google.golang.org/api/compute/v1"
+	gke "google.golang.org/api/container/v1"
 	"k8s.io/apimachinery/pkg/util/wait"
 	provider_gce "k8s.io/kubernetes/pkg/cloudprovider/providers/gce"
 )
 
+// GcpCloudProviderMode allows to pass information whether the cluster is GCE or GKE.
+type GcpCloudProviderMode string
+
+const (
+	// ModeGCE means that the cluster is running on gce (or using the legacy gke setup).
+	ModeGCE GcpCloudProviderMode = "gce"
+
+	// ModeGKE means that the cluster is running
+	ModeGKE GcpCloudProviderMode = "gke"
+)
+
 const (
 	operationWaitTimeout       = 5 * time.Second
 	operationPollInterval      = 100 * time.Millisecond
+	nodeAutoprovisioningPrefix = "nodeautoprovisioning"
 )
 
 type migInformation struct {
@@ -49,15 +62,19 @@ type GceManager struct {
 	migs     []*migInformation
 	migCache map[GceRef]*Mig
 
-	service    *gce.Service
+	gceService *gce.Service
+	gkeService *gke.Service
+
 	cacheMutex  sync.Mutex
 	zone        string
 	projectId   string
+	clusterName string
+	mode        GcpCloudProviderMode
 	templates   *templateBuilder
 }
 
 // CreateGceManager constructs gceManager object.
-func CreateGceManager(configReader io.Reader) (*GceManager, error) {
+func CreateGceManager(configReader io.Reader, mode GcpCloudProviderMode, clusterName string) (*GceManager, error) {
 	// Create Google Compute Engine token.
 	tokenSource := google.ComputeTokenSource("")
 	if configReader != nil {
@@ -89,16 +106,31 @@ func CreateGceManager(configReader io.Reader) (*GceManager, error) {
 	}
 	manager := &GceManager{
 		migs:        make([]*migInformation, 0),
-		service:   gceService,
+		gceService:  gceService,
 		migCache:    make(map[GceRef]*Mig),
 		zone:        zone,
 		projectId:   projectId,
+		clusterName: clusterName,
+		mode:        mode,
 		templates: &templateBuilder{
 			projectId: projectId,
 			zone:      zone,
 			service:   gceService,
 		},
 	}
+
+	if mode == ModeGKE {
+		gkeService, err := gke.New(client)
+		if err != nil {
+			return nil, err
+		}
+		manager.gkeService = gkeService
+		err = manager.fetchAllNodePools()
+		if err != nil {
+			glog.Errorf("Failed to fech node pools: %v", err)
+		}
+	}
+
 	go wait.Forever(func() {
 		manager.cacheMutex.Lock()
 		defer manager.cacheMutex.Unlock()
@@ -106,33 +138,97 @@ func CreateGceManager(configReader io.Reader) (*GceManager, error) {
 			glog.Errorf("Error while regenerating Mig cache: %v", err)
 		}
 	}, time.Hour)
+
 	return manager, nil
 }
 
-// RegisterMig registers mig in Gce Manager.
+func (m *GceManager) assertGKE() {
-func (m *GceManager) RegisterMig(mig *Mig) {
+	if m.mode != ModeGKE {
+		panic(fmt.Errorf("This should run only in GKE mode"))
+	}
+}
+
+// Gets all registered node pools
+func (m *GceManager) fetchAllNodePools() error {
+	m.assertGKE()
+
+	nodePoolsResponse, err := m.gkeService.Projects.Zones.Clusters.NodePools.List(m.projectId, m.zone, m.clusterName).Do()
+	if err != nil {
+		return err
+	}
+	for _, nodePool := range nodePoolsResponse.NodePools {
+		autoprovisioned := strings.Contains("name", nodeAutoprovisioningPrefix)
+		autoscaled := nodePool.Autoscaling != nil && nodePool.Autoscaling.Enabled
+		if !autoprovisioned && !autoscaled {
+			continue
+		}
+		// format is
+		// "https://www.googleapis.com/compute/v1/projects/mwielgus-proj/zones/europe-west1-b/instanceGroupManagers/gke-cluster-1-default-pool-ba78a787-grp"
+		for _, igurl := range nodePool.InstanceGroupUrls {
+			project, zone, name, err := parseGceUrl(igurl, "instanceGroupManagers")
+			if err != nil {
+				return err
+			}
+			mig := &Mig{
+				GceRef: GceRef{
+					Name:    name,
+					Zone:    zone,
+					Project: project,
+				},
+				gceManager:      m,
+				exist:           true,
+				autoprovisioned: autoprovisioned,
+			}
+			if autoscaled {
+				mig.minSize = int(nodePool.Autoscaling.MinNodeCount)
+				mig.maxSize = int(nodePool.Autoscaling.MaxNodeCount)
+			} else if autoprovisioned {
+				mig.minSize = minAutoprovisionedSize
+				mig.maxSize = maxAutoprovisionedSize
+			}
+			m.RegisterMig(mig)
+		}
+		// TODO - unregister migs
+	}
+	return nil
+}
+
+// RegisterMig registers mig in Gce Manager. Returns true if the node group didn't exist before.
+func (m *GceManager) RegisterMig(mig *Mig) bool {
 	m.cacheMutex.Lock()
 	defer m.cacheMutex.Unlock()
 
+	updated := false
+	for i := range m.migs {
+		if m.migs[i].config.GceRef == mig.GceRef {
+			m.migs[i].config = mig
+			glog.V(8).Infof("Updated Mig %s/%s/%s", mig.GceRef.Project, mig.GceRef.Zone, mig.GceRef.Name)
+			updated = true
+		}
+	}
+
+	if !updated {
+		glog.V(1).Infof("Registering %s/%s/%s", mig.GceRef.Project, mig.GceRef.Zone, mig.GceRef.Name)
 		m.migs = append(m.migs, &migInformation{
 			config: mig,
 		})
+	}
 
 	template, err := m.templates.getMigTemplate(mig)
 	if err != nil {
 		glog.Errorf("Failed to build template for %s", mig.Name)
 	}
 
-	node, err := m.templates.buildNodeFromTemplate(mig, template)
+	_, err = m.templates.buildNodeFromTemplate(mig, template)
 	if err != nil {
 		glog.Errorf("Failed to build template for %s", mig.Name)
 	}
-	glog.V(4).Infof("Node template for mig %s - %#v", mig.Name, node)
+	return !updated
 }
 
 // GetMigSize gets MIG size.
 func (m *GceManager) GetMigSize(mig *Mig) (int64, error) {
-	igm, err := m.service.InstanceGroupManagers.Get(mig.Project, mig.Zone, mig.Name).Do()
+	igm, err := m.gceService.InstanceGroupManagers.Get(mig.Project, mig.Zone, mig.Name).Do()
 	if err != nil {
 		return -1, err
 	}
@@ -142,7 +238,7 @@ func (m *GceManager) GetMigSize(mig *Mig) (int64, error) {
 // SetMigSize sets MIG size.
 func (m *GceManager) SetMigSize(mig *Mig, size int64) error {
 	glog.V(0).Infof("Setting mig size %s to %d", mig.Id(), size)
-	op, err := m.service.InstanceGroupManagers.Resize(mig.Project, mig.Zone, mig.Name, size).Do()
+	op, err := m.gceService.InstanceGroupManagers.Resize(mig.Project, mig.Zone, mig.Name, size).Do()
 	if err != nil {
 		return err
 	}
@@ -155,7 +251,7 @@ func (m *GceManager) SetMigSize(mig *Mig, size int64) error {
 func (m *GceManager) waitForOp(operation *gce.Operation, project string, zone string) error {
 	for start := time.Now(); time.Since(start) < operationWaitTimeout; time.Sleep(operationPollInterval) {
 		glog.V(4).Infof("Waiting for operation %s %s %s", project, zone, operation.Name)
-		if op, err := m.service.ZoneOperations.Get(project, zone, operation.Name).Do(); err == nil {
+		if op, err := m.gceService.ZoneOperations.Get(project, zone, operation.Name).Do(); err == nil {
 			glog.V(4).Infof("Operation %s %s %s status: %s", project, zone, operation.Name, op.Status)
 			if op.Status == "DONE" {
 				return nil
@@ -193,7 +289,7 @@ func (m *GceManager) DeleteInstances(instances []*GceRef) error {
 		req.Instances = append(req.Instances, GenerateInstanceUrl(instance.Project, instance.Zone, instance.Name))
 	}
 
-	op, err := m.service.InstanceGroupManagers.DeleteInstances(commonMig.Project, commonMig.Zone, commonMig.Name, &req).Do()
+	op, err := m.gceService.InstanceGroupManagers.DeleteInstances(commonMig.Project, commonMig.Zone, commonMig.Name, &req).Do()
 	if err != nil {
 		return err
 	}
@@ -235,13 +331,13 @@ func (m *GceManager) regenerateCache() error {
 		mig := migInfo.config
 		glog.V(4).Infof("Regenerating MIG information for %s %s %s", mig.Project, mig.Zone, mig.Name)
 
-		instanceGroupManager, err := m.service.InstanceGroupManagers.Get(mig.Project, mig.Zone, mig.Name).Do()
+		instanceGroupManager, err := m.gceService.InstanceGroupManagers.Get(mig.Project, mig.Zone, mig.Name).Do()
 		if err != nil {
 			return err
 		}
 		migInfo.basename = instanceGroupManager.BaseInstanceName
 
-		instances, err := m.service.InstanceGroupManagers.ListManagedInstances(mig.Project, mig.Zone, mig.Name).Do()
+		instances, err := m.gceService.InstanceGroupManagers.ListManagedInstances(mig.Project, mig.Zone, mig.Name).Do()
 		if err != nil {
 			glog.V(4).Infof("Failed MIG info request for %s %s %s: %v", mig.Project, mig.Zone, mig.Name, err)
 			return err
@@ -261,7 +357,7 @@ func (m *GceManager) regenerateCache() error {
 
 // GetMigNodes returns mig nodes.
 func (m *GceManager) GetMigNodes(mig *Mig) ([]string, error) {
-	instances, err := m.service.InstanceGroupManagers.ListManagedInstances(mig.Project, mig.Zone, mig.Name).Do()
+	instances, err := m.gceService.InstanceGroupManagers.ListManagedInstances(mig.Project, mig.Zone, mig.Name).Do()
 	if err != nil {
 		return []string{}, err
 	}

cluster-autoscaler/core/autoscaling_context.go

@@ -102,6 +102,8 @@ type AutoscalingOptions struct {
 	BalanceSimilarNodeGroups bool
 	// ConfigNamespace is the namesapce cluster-autoscaler is running in and all related configmaps live in
 	ConfigNamespace string
+	// ClusterName if available
+	ClusterName string
 }
 
 // NewAutoscalingContext returns an autoscaling context from all the necessary parameters passed via arguments
@@ -109,7 +111,7 @@ func NewAutoscalingContext(options AutoscalingOptions, predicateChecker *simulat
 	kubeClient kube_client.Interface, kubeEventRecorder kube_record.EventRecorder,
 	logEventRecorder *utils.LogEventRecorder, listerRegistry kube_util.ListerRegistry) (*AutoscalingContext, errors.AutoscalerError) {
 
-	cloudProviderBuilder := builder.NewCloudProviderBuilder(options.CloudProviderName, options.CloudConfig)
+	cloudProviderBuilder := builder.NewCloudProviderBuilder(options.CloudProviderName, options.CloudConfig, options.ClusterName)
 	cloudProvider := cloudProviderBuilder.Build(cloudprovider.NodeGroupDiscoveryOptions{
 		NodeGroupSpecs:             options.NodeGroups,
 		NodeGroupAutoDiscoverySpec: options.NodeGroupAutoDiscovery,

cluster-autoscaler/main.go

@@ -63,6 +63,7 @@ func (flag *MultiStringFlag) Set(value string) error {
 
 var (
 	nodeGroupsFlag         MultiStringFlag
+	clusterName            = flag.String("clusterName", "", "Autoscaled cluster name, if available")
 	address                = flag.String("address", ":8085", "The address to expose prometheus metrics.")
 	kubernetes             = flag.String("kubernetes", "", "Kubernetes master location. Leave blank for default")
 	cloudConfig            = flag.String("cloud-config", "", "The path to the cloud provider configuration file.  Empty string for no configuration file.")
@@ -126,6 +127,7 @@ func createAutoscalerOptions() core.AutoscalerOptions {
 		WriteStatusConfigMap:          *writeStatusConfigMapFlag,
 		BalanceSimilarNodeGroups:      *balanceSimilarNodeGroupsFlag,
 		ConfigNamespace:               *namespace,
+		ClusterName:                   *clusterName,
 	}
 
 	configFetcherOpts := dynamic.ConfigFetcherOptions{