add topology awareness for node plugin

src/csi/driver/driver.go

@@ -1,17 +1,27 @@
 package driver
 
+import (
+	"strings"
+	"utils/k8sutils"
+)
+
 type Driver struct {
 	name            string
 	version         string
 	useMultiPath    bool
 	isNeedMultiPath bool
+	k8sUtils        k8sutils.Interface
+	nodeName        string
 }
 
-func NewDriver(name, version string, useMultiPath, isNeedMultiPath bool) *Driver {
+func NewDriver(name, version string, useMultiPath, isNeedMultiPath bool,
+	k8sUtils k8sutils.Interface, nodeName string) *Driver {
 	return &Driver{
 		name:            name,
 		version:         version,
 		useMultiPath:    useMultiPath,
 		isNeedMultiPath: isNeedMultiPath,
+		k8sUtils:        k8sUtils,
+		nodeName:        strings.TrimSpace(nodeName),
 	}
 }

src/csi/driver/identity.go

@@ -27,6 +27,13 @@ func (d *Driver) GetPluginCapabilities(ctx context.Context, req *csi.GetPluginCa
 					},
 				},
 			},
+			&csi.PluginCapability{
+				Type: &csi.PluginCapability_Service_{
+					Service: &csi.PluginCapability_Service{
+						Type: csi.PluginCapability_Service_VOLUME_ACCESSIBILITY_CONSTRAINTS,
+					},
+				},
+			},
 		},
 	}, nil
 }

src/csi/driver/node.go

@@ -171,10 +171,26 @@ func (d *Driver) NodeGetInfo(ctx context.Context, req *csi.NodeGetInfoRequest) (
 		log.Errorf("Marshal node info of %s error: %v", nodeBytes, err)
 		return nil, status.Error(codes.Internal, err.Error())
 	}
-
 	log.Infof("Get NodeId %s", nodeBytes)
+
+	if d.nodeName == "" {
+		return &csi.NodeGetInfoResponse{
+			NodeId: string(nodeBytes),
+		}, nil
+	}
+
+	// Get topology info from Node labels
+	topology, err := d.k8sUtils.GetNodeTopology(d.nodeName)
+	if err != nil {
+		log.Errorln(err)
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+
 	return &csi.NodeGetInfoResponse{
 		NodeId: string(nodeBytes),
+		AccessibleTopology: &csi.Topology{
+			Segments: topology,
+		},
 	}, nil
 }
 

src/csi/main.go

@@ -14,6 +14,7 @@ import (
 	"runtime/debug"
 	"time"
 	"utils"
+	"utils/k8sutils"
 	"utils/log"
 
 	"github.com/container-storage-interface/spec/lib/go/csi"
@@ -30,6 +31,8 @@ const (
 
 	csiVersion        = "2.2.13"
 	defaultDriverName = "csi.huawei.com"
+
+	nodeNameEnv = "CSI_NODENAME"
 )
 
 var (
@@ -54,6 +57,12 @@ var (
 	volumeUseMultiPath = flag.Bool("volume-use-multipath",
 		true,
 		"Whether to use multipath when attach block volume")
+	kubeconfig = flag.String("kubeconfig",
+		"",
+		"absolute path to the kubeconfig file")
+	nodeName = flag.String("nodename",
+		os.Getenv(nodeNameEnv),
+		"absolute path to the kubeconfig file")
 
 	config CSIConfig
 	secret CSISecret
@@ -64,7 +73,7 @@ type CSIConfig struct {
 }
 
 type CSISecret struct {
-	Secrets map[string]interface{}  `json:"secrets"`
+	Secrets map[string]interface{} `json:"secrets"`
 }
 
 func init() {
@@ -97,6 +106,10 @@ func init() {
 
 	_ = mergeData(config, secret)
 
+	if "" == *nodeName {
+		logrus.Warning("Node name is empty. Topology aware volume provisioning feature may not behave normal")
+	}
+
 	if *containerized {
 		*controllerFlagFile = ""
 	}
@@ -199,10 +212,15 @@ func main() {
 		log.Fatalf("Listen on %s error: %v", *endpoint, err)
 	}
 
+	k8sUtils, err := k8sutils.NewK8SUtils(*kubeconfig)
+	if err != nil {
+		log.Fatalf("Kubernetes client initialization failed  %v", err)
+	}
+
 	isNeedMultiPath := utils.NeedMultiPath(config.Backends)
-	d := driver.NewDriver(*driverName, csiVersion, *volumeUseMultiPath, isNeedMultiPath)
-	server := grpc.NewServer()
+	d := driver.NewDriver(*driverName, csiVersion, *volumeUseMultiPath, isNeedMultiPath, k8sUtils, *nodeName)
 
+	server := grpc.NewServer()
 	csi.RegisterIdentityServer(server, d)
 	csi.RegisterControllerServer(server, d)
 	csi.RegisterNodeServer(server, d)

src/utils/k8sutils/k8sutils.go

@@ -0,0 +1,75 @@
+package k8sutils
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+)
+
+const (
+	topologyRegx = "topology.kubernetes.io/*"
+)
+
+type Interface interface {
+	GetNodeTopology(nodeName string) (map[string]string, error)
+}
+
+type KubeClient struct {
+	clientSet *kubernetes.Clientset
+}
+
+func NewK8SUtils(kubeConfig string) (Interface, error) {
+	var clientset *kubernetes.Clientset
+
+	if kubeConfig != "" {
+		config, err := clientcmd.BuildConfigFromFlags("", kubeConfig)
+		if err != nil {
+			return nil, err
+		}
+
+		clientset, err = kubernetes.NewForConfig(config)
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		config, err := rest.InClusterConfig()
+		if err != nil {
+			return nil, err
+		}
+
+		clientset, err = kubernetes.NewForConfig(config)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return &KubeClient{
+		clientSet: clientset,
+	}, nil
+}
+
+func (k *KubeClient) GetNodeTopology(nodeName string) (map[string]string, error) {
+	k8sNode, err := k.getNode(nodeName)
+	if err != nil {
+		return nil, errors.New(fmt.Sprintf("Failed to get node topology with error: %v", err))
+	}
+
+	topology := make(map[string]string)
+	for key, value := range k8sNode.Labels {
+		if match, err := regexp.MatchString(topologyRegx, key); err == nil && match {
+			topology[key] = value
+		}
+	}
+
+	return topology, nil
+}
+
+func (k *KubeClient) getNode(nodeName string) (*corev1.Node, error) {
+	return k.clientSet.CoreV1().Nodes().Get(nodeName, metav1.GetOptions{})
+}

yamls/deploy/huawei-csi-controller.yaml

@@ -52,6 +52,11 @@ spec:
           env:
             - name: CSI_ENDPOINT
               value: /var/lib/csi/sockets/pluginproxy/csi.sock
+            - name: CSI_NODENAME
+              valueFrom:
+                fieldRef:
+                  apiVersion: v1
+                  fieldPath: spec.nodeName
           imagePullPolicy: "IfNotPresent"
           volumeMounts:
             - name: socket-dir

yamls/deploy/huawei-csi-multi-controller.yaml

@@ -55,6 +55,11 @@ spec:
           env:
             - name: CSI_ENDPOINT
               value: /var/lib/csi/sockets/pluginproxy/csi.sock
+            - name: CSI_NODENAME
+                valueFrom:
+                  fieldRef:
+                    apiVersion: v1
+                    fieldPath: spec.nodeName
           imagePullPolicy: "IfNotPresent"
           volumeMounts:
             - name: socket-dir

yamls/deploy/huawei-csi-node.yaml

@@ -36,6 +36,12 @@ spec:
             - "--containerized"
             - "--driver-name=csi.huawei.com"
             - "--volume-use-multipath=true"
+          env:
+            - name: CSI_NODENAME
+              valueFrom:
+                fieldRef:
+                  apiVersion: v1
+                  fieldPath: spec.nodeName
           securityContext:
             privileged: true
             capabilities:

yamls/deploy/huawei-csi-rbac.yaml

@@ -100,6 +100,9 @@ rules:
   - apiGroups: [""]
     resources: ["events"]
     verbs: ["get", "list", "watch", "create", "update", "patch"]
+  - apiGroups: [""]
+    resources: ["nodes"]
+    verbs: ["get"]
 
 ---
 kind: ClusterRoleBinding

yamls/deploy/huawei-csi-resize-controller.yaml

@@ -65,6 +65,11 @@ spec:
           env:
             - name: CSI_ENDPOINT
               value: /var/lib/csi/sockets/pluginproxy/csi.sock
+            - name: CSI_NODENAME
+              valueFrom:
+                fieldRef:
+                  apiVersion: v1
+                  fieldPath: spec.nodeName
           imagePullPolicy: "IfNotPresent"
           volumeMounts:
             - name: socket-dir

yamls/deploy/huawei-csi-resize-rbac.yaml

@@ -164,6 +164,9 @@ rules:
   - apiGroups: [""]
     resources: ["events"]
     verbs: ["get", "list", "watch", "create", "update", "patch"]
+  - apiGroups: [""]
+    resources: ["nodes"]
+    verbs: ["get"]
 
 ---
 kind: ClusterRoleBinding

yamls/deploy/huawei-csi-resize-snapshot-controller.yaml

@@ -88,6 +88,11 @@ spec:
           env:
             - name: CSI_ENDPOINT
               value: /var/lib/csi/sockets/pluginproxy/csi.sock
+            - name: CSI_NODENAME
+              valueFrom:
+                fieldRef:
+                  apiVersion: v1
+                  fieldPath: spec.nodeName
           imagePullPolicy: "IfNotPresent"
           volumeMounts:
             - name: socket-dir

yamls/deploy/huawei-csi-resize-snapshot-rbac.yaml

@@ -298,6 +298,9 @@ rules:
   - apiGroups: [""]
     resources: ["events"]
     verbs: ["get", "list", "watch", "create", "update", "patch"]
+  - apiGroups: [""]
+    resources: ["nodes"]
+    verbs: ["get"]
 
 ---
 kind: ClusterRoleBinding