refactor code logic for cloud-controller manager

cmd/cloud-controller-manager/app/controllermanager.go

@@ -19,10 +19,8 @@ package app
 import (
 	"context"
 	"fmt"
-	"net"
 	"net/http"
 	"os"
-	"strings"
 	"time"
 
 	"github.com/spf13/cobra"
@@ -34,7 +32,6 @@ import (
 	"k8s.io/apiserver/pkg/server/healthz"
 	apiserverflag "k8s.io/apiserver/pkg/util/flag"
 	"k8s.io/apiserver/pkg/util/globalflag"
-	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/tools/leaderelection"
 	"k8s.io/client-go/tools/leaderelection/resourcelock"
 	cloudprovider "k8s.io/cloud-provider"
@@ -43,9 +40,6 @@ import (
 	"k8s.io/kubernetes/cmd/cloud-controller-manager/app/options"
 	genericcontrollermanager "k8s.io/kubernetes/cmd/controller-manager/app"
 	cmoptions "k8s.io/kubernetes/cmd/controller-manager/app/options"
-	cloudcontrollers "k8s.io/kubernetes/pkg/controller/cloud"
-	routecontroller "k8s.io/kubernetes/pkg/controller/route"
-	servicecontroller "k8s.io/kubernetes/pkg/controller/service"
 	"k8s.io/kubernetes/pkg/util/configz"
 	utilflag "k8s.io/kubernetes/pkg/util/flag"
 	"k8s.io/kubernetes/pkg/version"
@@ -165,7 +159,7 @@ func Run(c *cloudcontrollerconfig.CompletedConfig, stopCh <-chan struct{}) error
 	}
 
 	run := func(ctx context.Context) {
-		if err := startControllers(c, ctx.Done(), cloud); err != nil {
+		if err := startControllers(c, ctx.Done(), cloud, newControllerInitializers()); err != nil {
 			klog.Fatalf("error running controllers: %v", err)
 		}
 	}
@@ -215,87 +209,40 @@ func Run(c *cloudcontrollerconfig.CompletedConfig, stopCh <-chan struct{}) error
 }
 
 // startControllers starts the cloud specific controller loops.
-func startControllers(c *cloudcontrollerconfig.CompletedConfig, stop <-chan struct{}, cloud cloudprovider.Interface) error {
-	// Function to build the kube client object
-	client := func(serviceAccountName string) kubernetes.Interface {
-		return c.ClientBuilder.ClientOrDie(serviceAccountName)
-	}
+func startControllers(c *cloudcontrollerconfig.CompletedConfig, stopCh <-chan struct{}, cloud cloudprovider.Interface, controllers map[string]initFunc) error {
 	if cloud != nil {
 		// Initialize the cloud provider with a reference to the clientBuilder
-		cloud.Initialize(c.ClientBuilder, stop)
-	}
-	// Start the CloudNodeController
-	nodeController := cloudcontrollers.NewCloudNodeController(
-		c.SharedInformers.Core().V1().Nodes(),
-		// cloud node controller uses existing cluster role from node-controller
-		client("node-controller"), cloud,
-		c.ComponentConfig.NodeStatusUpdateFrequency.Duration)
-
-	go nodeController.Run(stop)
-	time.Sleep(wait.Jitter(c.ComponentConfig.Generic.ControllerStartInterval.Duration, ControllerStartJitter))
-
-	cloudNodeLifecycleController, err := cloudcontrollers.NewCloudNodeLifecycleController(
-		c.SharedInformers.Core().V1().Nodes(),
-		// cloud node lifecycle controller uses existing cluster role from node-controller
-		client("node-controller"), cloud,
-		c.ComponentConfig.KubeCloudShared.NodeMonitorPeriod.Duration,
-	)
-	if err != nil {
-		klog.Errorf("failed to start cloud node lifecycle controller: %s", err)
-	} else {
-		go cloudNodeLifecycleController.Run(stop)
-		time.Sleep(wait.Jitter(c.ComponentConfig.Generic.ControllerStartInterval.Duration, ControllerStartJitter))
-	}
-
-	// Start the PersistentVolumeLabelController
-	pvlController := cloudcontrollers.NewPersistentVolumeLabelController(client("pvl-controller"), cloud)
-	go pvlController.Run(5, stop)
-	time.Sleep(wait.Jitter(c.ComponentConfig.Generic.ControllerStartInterval.Duration, ControllerStartJitter))
-
-	// Start the service controller
-	serviceController, err := servicecontroller.New(
-		cloud,
-		client("service-controller"),
-		c.SharedInformers.Core().V1().Services(),
-		c.SharedInformers.Core().V1().Nodes(),
-		c.ComponentConfig.KubeCloudShared.ClusterName,
-	)
-	if err != nil {
-		klog.Errorf("Failed to start service controller: %v", err)
-	} else {
-		go serviceController.Run(stop, int(c.ComponentConfig.ServiceController.ConcurrentServiceSyncs))
-		time.Sleep(wait.Jitter(c.ComponentConfig.Generic.ControllerStartInterval.Duration, ControllerStartJitter))
+		cloud.Initialize(c.ClientBuilder, stopCh)
 	}
 
-	// If CIDRs should be allocated for pods and set on the CloudProvider, then start the route controller
-	if c.ComponentConfig.KubeCloudShared.AllocateNodeCIDRs && c.ComponentConfig.KubeCloudShared.ConfigureCloudRoutes {
-		if routes, ok := cloud.Routes(); !ok {
-			klog.Warning("configure-cloud-routes is set, but cloud provider does not support routes. Will not configure cloud provider routes.")
-		} else {
-			var clusterCIDR *net.IPNet
-			if len(strings.TrimSpace(c.ComponentConfig.KubeCloudShared.ClusterCIDR)) != 0 {
-				_, clusterCIDR, err = net.ParseCIDR(c.ComponentConfig.KubeCloudShared.ClusterCIDR)
-				if err != nil {
-					klog.Warningf("Unsuccessful parsing of cluster CIDR %v: %v", c.ComponentConfig.KubeCloudShared.ClusterCIDR, err)
-				}
-			}
+	for controllerName, initFn := range controllers {
+		if !genericcontrollermanager.IsControllerEnabled(controllerName, ControllersDisabledByDefault, c.ComponentConfig.Generic.Controllers) {
+			klog.Warningf("%q is disabled", controllerName)
+			continue
+		}
 
-			routeController := routecontroller.New(routes, client("route-controller"), c.SharedInformers.Core().V1().Nodes(), c.ComponentConfig.KubeCloudShared.ClusterName, clusterCIDR)
-			go routeController.Run(stop, c.ComponentConfig.KubeCloudShared.RouteReconciliationPeriod.Duration)
-			time.Sleep(wait.Jitter(c.ComponentConfig.Generic.ControllerStartInterval.Duration, ControllerStartJitter))
+		klog.V(1).Infof("Starting %q", controllerName)
+		_, started, err := initFn(c, cloud, stopCh)
+		if err != nil {
+			klog.Errorf("Error starting %q", controllerName)
+			return err
 		}
-	} else {
-		klog.Infof("Will not configure cloud provider routes for allocate-node-cidrs: %v, configure-cloud-routes: %v.", c.ComponentConfig.KubeCloudShared.AllocateNodeCIDRs, c.ComponentConfig.KubeCloudShared.ConfigureCloudRoutes)
+		if !started {
+			klog.Warningf("Skipping %q", controllerName)
+			continue
+		}
+		klog.Infof("Started %q", controllerName)
+
+		time.Sleep(wait.Jitter(c.ComponentConfig.Generic.ControllerStartInterval.Duration, ControllerStartJitter))
 	}
 
 	// If apiserver is not running we should wait for some time and fail only then. This is particularly
 	// important when we start apiserver and controller manager at the same time.
-	err = genericcontrollermanager.WaitForAPIServer(c.VersionedClient, 10*time.Second)
-	if err != nil {
+	if err := genericcontrollermanager.WaitForAPIServer(c.VersionedClient, 10*time.Second); err != nil {
 		klog.Fatalf("Failed to wait for apiserver being healthy: %v", err)
 	}
 
-	c.SharedInformers.Start(stop)
+	c.SharedInformers.Start(stopCh)
 
 	select {}
 }

cmd/cloud-controller-manager/app/core.go

+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package app implements a server that runs a set of active
+// components.  This includes node controllers, service and
+// route controller, and so on.
+//
+package app
+
+import (
+	"net"
+	"net/http"
+	"strings"
+
+	cloudprovider "k8s.io/cloud-provider"
+	"k8s.io/klog"
+	cloudcontrollerconfig "k8s.io/kubernetes/cmd/cloud-controller-manager/app/config"
+	cloudcontrollers "k8s.io/kubernetes/pkg/controller/cloud"
+	routecontroller "k8s.io/kubernetes/pkg/controller/route"
+	servicecontroller "k8s.io/kubernetes/pkg/controller/service"
+)
+
+func startCloudNodeController(ctx *cloudcontrollerconfig.CompletedConfig, cloud cloudprovider.Interface, stopCh <-chan struct{}) (http.Handler, bool, error) {
+	// Start the CloudNodeController
+	nodeController := cloudcontrollers.NewCloudNodeController(
+		ctx.SharedInformers.Core().V1().Nodes(),
+		// cloud node controller uses existing cluster role from node-controller
+		ctx.ClientBuilder.ClientOrDie("node-controller"),
+		cloud,
+		ctx.ComponentConfig.NodeStatusUpdateFrequency.Duration)
+
+	go nodeController.Run(stopCh)
+
+	return nil, true, nil
+}
+
+func startCloudNodeLifecycleController(ctx *cloudcontrollerconfig.CompletedConfig, cloud cloudprovider.Interface, stopCh <-chan struct{}) (http.Handler, bool, error) {
+	// Start the cloudNodeLifecycleController
+	cloudNodeLifecycleController, err := cloudcontrollers.NewCloudNodeLifecycleController(
+		ctx.SharedInformers.Core().V1().Nodes(),
+		// cloud node lifecycle controller uses existing cluster role from node-controller
+		ctx.ClientBuilder.ClientOrDie("node-controller"),
+		cloud,
+		ctx.ComponentConfig.KubeCloudShared.NodeMonitorPeriod.Duration,
+	)
+	if err != nil {
+		klog.Warningf("failed to start cloud node lifecycle controller: %s", err)
+		return nil, false, nil
+	}
+
+	go cloudNodeLifecycleController.Run(stopCh)
+
+	return nil, true, nil
+}
+
+func startPersistentVolumeLabelController(ctx *cloudcontrollerconfig.CompletedConfig, cloud cloudprovider.Interface, stopCh <-chan struct{}) (http.Handler, bool, error) {
+	// Start the PersistentVolumeLabelController
+	pvlController := cloudcontrollers.NewPersistentVolumeLabelController(
+		ctx.ClientBuilder.ClientOrDie("pvl-controller"),
+		cloud,
+	)
+	go pvlController.Run(5, stopCh)
+
+	return nil, true, nil
+}
+
+func startServiceController(ctx *cloudcontrollerconfig.CompletedConfig, cloud cloudprovider.Interface, stopCh <-chan struct{}) (http.Handler, bool, error) {
+	// Start the service controller
+	serviceController, err := servicecontroller.New(
+		cloud,
+		ctx.ClientBuilder.ClientOrDie("service-controller"),
+		ctx.SharedInformers.Core().V1().Services(),
+		ctx.SharedInformers.Core().V1().Nodes(),
+		ctx.ComponentConfig.KubeCloudShared.ClusterName,
+	)
+	if err != nil {
+		// This error shouldn't fail. It lives like this as a legacy.
+		klog.Errorf("Failed to start service controller: %v", err)
+		return nil, false, nil
+	}
+
+	go serviceController.Run(stopCh, int(ctx.ComponentConfig.ServiceController.ConcurrentServiceSyncs))
+
+	return nil, true, nil
+}
+
+func startRouteController(ctx *cloudcontrollerconfig.CompletedConfig, cloud cloudprovider.Interface, stopCh <-chan struct{}) (http.Handler, bool, error) {
+	if !ctx.ComponentConfig.KubeCloudShared.AllocateNodeCIDRs || !ctx.ComponentConfig.KubeCloudShared.ConfigureCloudRoutes {
+		klog.Infof("Will not configure cloud provider routes for allocate-node-cidrs: %v, configure-cloud-routes: %v.", ctx.ComponentConfig.KubeCloudShared.AllocateNodeCIDRs, ctx.ComponentConfig.KubeCloudShared.ConfigureCloudRoutes)
+		return nil, false, nil
+	}
+
+	// If CIDRs should be allocated for pods and set on the CloudProvider, then start the route controller
+	routes, ok := cloud.Routes()
+	if !ok {
+		klog.Warning("configure-cloud-routes is set, but cloud provider does not support routes. Will not configure cloud provider routes.")
+		return nil, false, nil
+	}
+	var clusterCIDR *net.IPNet
+	var err error
+	if len(strings.TrimSpace(ctx.ComponentConfig.KubeCloudShared.ClusterCIDR)) != 0 {
+		_, clusterCIDR, err = net.ParseCIDR(ctx.ComponentConfig.KubeCloudShared.ClusterCIDR)
+		if err != nil {
+			klog.Warningf("Unsuccessful parsing of cluster CIDR %v: %v", ctx.ComponentConfig.KubeCloudShared.ClusterCIDR, err)
+		}
+	}
+
+	routeController := routecontroller.New(
+		routes,
+		ctx.ClientBuilder.ClientOrDie("route-controller"),
+		ctx.SharedInformers.Core().V1().Nodes(),
+		ctx.ComponentConfig.KubeCloudShared.ClusterName,
+		clusterCIDR,
+	)
+	go routeController.Run(stopCh, ctx.ComponentConfig.KubeCloudShared.RouteReconciliationPeriod.Duration)
+
+	return nil, true, nil
+}

cmd/controller-manager/app/helper.go

@@ -21,6 +21,7 @@ import (
 	"net/http"
 	"time"
 
+	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/apimachinery/pkg/util/wait"
 	clientset "k8s.io/client-go/kubernetes"
 	"k8s.io/klog"
@@ -53,3 +54,26 @@ func WaitForAPIServer(client clientset.Interface, timeout time.Duration) error {
 
 	return nil
 }
+
+// IsControllerEnabled check if a specified controller enabled or not.
+func IsControllerEnabled(name string, disabledByDefaultControllers sets.String, controllers []string) bool {
+	hasStar := false
+	for _, ctrl := range controllers {
+		if ctrl == name {
+			return true
+		}
+		if ctrl == "-"+name {
+			return false
+		}
+		if ctrl == "*" {
+			hasStar = true
+		}
+	}
+	// if we get here, there was no explicit choice
+	if !hasStar {
+		// nothing on by default
+		return false
+	}
+
+	return !disabledByDefaultControllers.Has(name)
+}

cmd/kube-controller-manager/app/controller_manager_test.go → cmd/controller-manager/app/helper_test.go

@@ -14,10 +14,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// Package app implements a server that runs a set of active
-// components.  This includes replication controllers, service endpoints and
-// nodes.
-//
 package app
 
 import (
@@ -74,7 +70,7 @@ func TestIsControllerEnabled(t *testing.T) {
 	}
 
 	for _, tc := range tcs {
-		actual := IsControllerEnabled(tc.controllerName, sets.NewString(tc.disabledByDefaultControllers...), tc.controllers...)
+		actual := IsControllerEnabled(tc.controllerName, sets.NewString(tc.disabledByDefaultControllers...), tc.controllers)
 		assert.Equal(t, tc.expected, actual, "%v: expected %v, got %v", tc.name, tc.expected, actual)
 	}
 

cmd/kube-controller-manager/app/controllermanager.go

@@ -301,32 +301,7 @@ type ControllerContext struct {
 }
 
 func (c ControllerContext) IsControllerEnabled(name string) bool {
-	return IsControllerEnabled(name, ControllersDisabledByDefault, c.ComponentConfig.Generic.Controllers...)
-}
-
-func IsControllerEnabled(name string, disabledByDefaultControllers sets.String, controllers ...string) bool {
-	hasStar := false
-	for _, ctrl := range controllers {
-		if ctrl == name {
-			return true
-		}
-		if ctrl == "-"+name {
-			return false
-		}
-		if ctrl == "*" {
-			hasStar = true
-		}
-	}
-	// if we get here, there was no explicit choice
-	if !hasStar {
-		// nothing on by default
-		return false
-	}
-	if disabledByDefaultControllers.Has(name) {
-		return false
-	}
-
-	return true
+	return genericcontrollermanager.IsControllerEnabled(name, ControllersDisabledByDefault, c.ComponentConfig.Generic.Controllers)
 }
 
 // InitFunc is used to launch a particular controller.  It may run additional "should I activate checks".