compile check to ensure cloud providers implement cloud interfaces

pkg/cloudprovider/providers/aws/aws.go

@@ -261,9 +261,6 @@ const DefaultVolumeType = "gp2"
 // Used to call recognizeWellKnownRegions just once
 var once sync.Once
 
-// AWS implements PVLabeler.
-var _ cloudprovider.PVLabeler = (*Cloud)(nil)
-
 // Services is an abstraction over AWS, to allow mocking/other implementations
 type Services interface {
 	Compute(region string) (EC2, error)
@@ -480,6 +477,13 @@ type InstanceGroupInfo interface {
 	CurrentSize() (int, error)
 }
 
+var _ cloudprovider.Interface = (*Cloud)(nil)
+var _ cloudprovider.Instances = (*Cloud)(nil)
+var _ cloudprovider.LoadBalancer = (*Cloud)(nil)
+var _ cloudprovider.Routes = (*Cloud)(nil)
+var _ cloudprovider.Zones = (*Cloud)(nil)
+var _ cloudprovider.PVLabeler = (*Cloud)(nil)
+
 // Cloud is an implementation of Interface, LoadBalancer and Instances for Amazon Web Services.
 type Cloud struct {
 	ec2      EC2

pkg/cloudprovider/providers/azure/azure.go

@@ -71,9 +71,6 @@ var (
 	defaultExcludeMasterFromStandardLB = true
 )
 
-// Azure implements PVLabeler.
-var _ cloudprovider.PVLabeler = (*Cloud)(nil)
-
 // Config holds the configuration parsed from the --cloud-config flag
 // All fields are required unless otherwise specified
 type Config struct {
@@ -143,6 +140,13 @@ type Config struct {
 	MaximumLoadBalancerRuleCount int `json:"maximumLoadBalancerRuleCount" yaml:"maximumLoadBalancerRuleCount"`
 }
 
+var _ cloudprovider.Interface = (*Cloud)(nil)
+var _ cloudprovider.Instances = (*Cloud)(nil)
+var _ cloudprovider.LoadBalancer = (*Cloud)(nil)
+var _ cloudprovider.Routes = (*Cloud)(nil)
+var _ cloudprovider.Zones = (*Cloud)(nil)
+var _ cloudprovider.PVLabeler = (*Cloud)(nil)
+
 // Cloud holds the config and clients
 type Cloud struct {
 	Config

pkg/cloudprovider/providers/cloudstack/cloudstack.go

@@ -120,6 +120,11 @@ func newCSCloud(cfg *CSConfig) (*CSCloud, error) {
 	return cs, nil
 }
 
+var _ cloudprovider.Interface = (*CSCloud)(nil)
+var _ cloudprovider.Instances = (*CSCloud)(nil)
+var _ cloudprovider.LoadBalancer = (*CSCloud)(nil)
+var _ cloudprovider.Zones = (*CSCloud)(nil)
+
 // Initialize passes a Kubernetes clientBuilder interface to the cloud provider
 func (cs *CSCloud) Initialize(clientBuilder cloudprovider.ControllerClientBuilder, stop <-chan struct{}) {
 }

pkg/cloudprovider/providers/cloudstack/metadata.go

@@ -31,6 +31,9 @@ import (
 	"k8s.io/klog"
 )
 
+var _ cloudprovider.Instances = (*metadata)(nil)
+var _ cloudprovider.Zones = (*metadata)(nil)
+
 type metadata struct {
 	dhcpServer string
 	zone       string

pkg/cloudprovider/providers/fake/fake.go

@@ -45,6 +45,14 @@ type FakeUpdateBalancerCall struct {
 	Hosts   []*v1.Node
 }
 
+var _ cloudprovider.Interface = (*FakeCloud)(nil)
+var _ cloudprovider.Instances = (*FakeCloud)(nil)
+var _ cloudprovider.LoadBalancer = (*FakeCloud)(nil)
+var _ cloudprovider.Routes = (*FakeCloud)(nil)
+var _ cloudprovider.Zones = (*FakeCloud)(nil)
+var _ cloudprovider.PVLabeler = (*FakeCloud)(nil)
+var _ cloudprovider.Clusters = (*FakeCloud)(nil)
+
 // FakeCloud is a test-double implementation of Interface, LoadBalancer, Instances, and Routes. It is useful for testing.
 type FakeCloud struct {
 	Exists bool

pkg/cloudprovider/providers/gce/gce.go

@@ -98,6 +98,14 @@ type gceObject interface {
 	MarshalJSON() ([]byte, error)
 }
 
+var _ cloudprovider.Interface = (*Cloud)(nil)
+var _ cloudprovider.Instances = (*Cloud)(nil)
+var _ cloudprovider.LoadBalancer = (*Cloud)(nil)
+var _ cloudprovider.Routes = (*Cloud)(nil)
+var _ cloudprovider.Zones = (*Cloud)(nil)
+var _ cloudprovider.PVLabeler = (*Cloud)(nil)
+var _ cloudprovider.Clusters = (*Cloud)(nil)
+
 // Cloud is an implementation of Interface, LoadBalancer and Instances for Google Compute Engine.
 type Cloud struct {
 	// ClusterID contains functionality for getting (and initializing) the ingress-uid. Call Cloud.Initialize()
@@ -765,9 +773,6 @@ func isProjectNumber(idOrNumber string) bool {
 	return err == nil
 }
 
-// Cloud implements cloudprovider.Interface.
-var _ cloudprovider.Interface = (*Cloud)(nil)
-
 func gceNetworkURL(apiEndpoint, project, network string) string {
 	if apiEndpoint == "" {
 		apiEndpoint = gceComputeAPIEndpoint

pkg/cloudprovider/providers/openstack/openstack.go

@@ -126,6 +126,9 @@ type MetadataOpts struct {
 	RequestTimeout MyDuration `gcfg:"request-timeout"`
 }
 
+var _ cloudprovider.Interface = (*OpenStack)(nil)
+var _ cloudprovider.Zones = (*OpenStack)(nil)
+
 // OpenStack is an implementation of cloud provider Interface for OpenStack.
 type OpenStack struct {
 	provider     *gophercloud.ProviderClient

pkg/cloudprovider/providers/openstack/openstack_instances.go

@@ -30,6 +30,8 @@ import (
 	cloudprovider "k8s.io/cloud-provider"
 )
 
+var _ cloudprovider.Instances = (*Instances)(nil)
+
 // Instances encapsulates an implementation of Instances for OpenStack.
 type Instances struct {
 	compute *gophercloud.ServiceClient

pkg/cloudprovider/providers/openstack/openstack_loadbalancer.go

@@ -78,6 +78,8 @@ const (
 	ServiceAnnotationLoadBalancerInternal = "service.beta.kubernetes.io/openstack-internal-load-balancer"
 )
 
+var _ cloudprovider.LoadBalancer = (*LbaasV2)(nil)
+
 // LbaasV2 is a LoadBalancer implementation for Neutron LBaaS v2 API
 type LbaasV2 struct {
 	LoadBalancer

pkg/cloudprovider/providers/openstack/openstack_routes.go

@@ -33,6 +33,8 @@ import (
 
 var errNoRouterID = errors.New("router-id not set in cloud provider config")
 
+var _ cloudprovider.Routes = (*Routes)(nil)
+
 // Routes implements the cloudprovider.Routes for OpenStack clouds
 type Routes struct {
 	compute *gophercloud.ServiceClient

pkg/cloudprovider/providers/ovirt/ovirt.go

@@ -49,6 +49,9 @@ type Instance struct {
 // InstanceMap provides the map of Ovirt instances.
 type InstanceMap map[string]Instance
 
+var _ cloudprovider.Interface = (*Cloud)(nil)
+var _ cloudprovider.Instances = (*Cloud)(nil)
+
 // Cloud is an implementation of the cloud provider interface for Ovirt.
 type Cloud struct {
 	VmsRequest   *url.URL

pkg/cloudprovider/providers/photon/photon.go

@@ -55,6 +55,10 @@ const (
 // overrideIP = true in cloud config file. Default value is false.
 var overrideIP bool = false
 
+var _ cloudprovider.Interface = (*PCCloud)(nil)
+var _ cloudprovider.Instances = (*PCCloud)(nil)
+var _ cloudprovider.Zones = (*PCCloud)(nil)
+
 // Photon is an implementation of the cloud provider interface for Photon Controller.
 type PCCloud struct {
 	cfg *PCConfig

pkg/cloudprovider/providers/vsphere/vsphere.go

@@ -76,6 +76,10 @@ var (
 	ErrPasswordMissing = errors.New(MissingPasswordErrMsg)
 )
 
+var _ cloudprovider.Interface = (*VSphere)(nil)
+var _ cloudprovider.Instances = (*VSphere)(nil)
+var _ cloudprovider.Zones = (*VSphere)(nil)
+
 // VSphere is an implementation of cloud provider Interface for VSphere.
 type VSphere struct {
 	cfg      *VSphereConfig