Add a clusters interface and GCE implementation.

pkg/cloudprovider/aws/aws.go

@@ -101,6 +101,10 @@ func newAWSCloud(config io.Reader, authFunc AuthFunc) (*AWSCloud, error) {
 	}, nil
 }
 
+func (aws *AWSCloud) Clusters() (cloudprovider.Clusters, bool) {
+	return nil, false
+}
+
 // TCPLoadBalancer returns an implementation of TCPLoadBalancer for Amazon Web Services.
 func (aws *AWSCloud) TCPLoadBalancer() (cloudprovider.TCPLoadBalancer, bool) {
 	return nil, false

pkg/cloudprovider/cloud.go

@@ -30,6 +30,16 @@ type Interface interface {
 	Instances() (Instances, bool)
 	// Zones returns a zones interface. Also returns true if the interface is supported, false otherwise.
 	Zones() (Zones, bool)
+	// Clusters returns a clusters interface.  Also returns true if the interface is supported, false otherwise.
+	Clusters() (Clusters, bool)
+}
+
+// Clusters is an abstract, pluggable interface for clusters of containers.
+type Clusters interface {
+	// List lists the names of the available clusters.
+	ListClusters() ([]string, error)
+	// Master gets back the address (either DNS name or IP address) of the master node for the cluster.
+	Master(clusterName string) (string, error)
 }
 
 // TCPLoadBalancer is an abstract, pluggable interface for TCP load balancers.

pkg/cloudprovider/fake/fake.go

@@ -45,8 +45,11 @@ func (f *FakeCloud) ClearCalls() {
 	f.Calls = []string{}
 }
 
+func (f *FakeCloud) Clusters() (cloudprovider.Clusters, bool) {
+	return f, true
+}
+
 // TCPLoadBalancer returns a fake implementation of TCPLoadBalancer.
-//
 // Actually it just returns f itself.
 func (f *FakeCloud) TCPLoadBalancer() (cloudprovider.TCPLoadBalancer, bool) {
 	return f, true

pkg/cloudprovider/gce/gce.go

@@ -30,6 +30,7 @@ import (
 
 	"code.google.com/p/goauth2/compute/serviceaccount"
 	compute "code.google.com/p/google-api-go-client/compute/v1"
+	container "code.google.com/p/google-api-go-client/container/v1beta1"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/cloudprovider"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/resources"
@@ -40,6 +41,7 @@ import (
 // GCECloud is an implementation of Interface, TCPLoadBalancer and Instances for Google Compute Engine.
 type GCECloud struct {
 	service          *compute.Service
+	containerService *container.Service
 	projectID        string
 	zone             string
 	instanceID       string
@@ -115,14 +117,23 @@ func newGCECloud() (*GCECloud, error) {
 	if err != nil {
 		return nil, err
 	}
+	containerSvc, err := container.New(client)
+	if err != nil {
+		return nil, err
+	}
 	return &GCECloud{
 		service:          svc,
+		containerService: containerSvc,
 		projectID:        projectID,
 		zone:             zone,
 		instanceID:       instanceID,
 	}, nil
 }
 
+func (gce *GCECloud) Clusters() (cloudprovider.Clusters, bool) {
+	return gce, true
+}
+
 // TCPLoadBalancer returns an implementation of TCPLoadBalancer for Google Compute Engine.
 func (gce *GCECloud) TCPLoadBalancer() (cloudprovider.TCPLoadBalancer, bool) {
 	return gce, true
@@ -385,3 +396,19 @@ func (gce *GCECloud) convertDiskToAttachedDisk(disk *compute.Disk, readWrite str
 		Type:       "PERSISTENT",
 	}
 }
+
+func (gce *GCECloud) ListClusters() ([]string, error) {
+	list, err := gce.containerService.Projects.Clusters.List(gce.projectID).Do()
+	if err != nil {
+		return nil, err
+	}
+	result := []string{}
+	for _, cluster := range list.Clusters {
+		result = append(result, cluster.Name)
+	}
+	return result, nil
+}
+
+func (gce *GCECloud) Master(clusterName string) (string, error) {
+	return "k8s-" + clusterName + "-master.internal", nil
+}

pkg/cloudprovider/openstack/openstack.go

@@ -208,6 +208,10 @@ func (i *Instances) GetNodeResources(name string) (*api.NodeResources, error) {
 	return rsrc, nil
 }
 
+func (aws *OpenStack) Clusters() (cloudprovider.Clusters, bool) {
+	return nil, false
+}
+
 func (os *OpenStack) TCPLoadBalancer() (cloudprovider.TCPLoadBalancer, bool) {
 	return nil, false
 }

pkg/cloudprovider/ovirt/ovirt.go

@@ -95,6 +95,10 @@ func newOVirtCloud(config io.Reader) (*OVirtCloud, error) {
 	return &OVirtCloud{VmsRequest: request}, nil
 }
 
+func (aws *OVirtCloud) Clusters() (cloudprovider.Clusters, bool) {
+	return nil, false
+}
+
 // TCPLoadBalancer returns an implementation of TCPLoadBalancer for oVirt cloud
 func (v *OVirtCloud) TCPLoadBalancer() (cloudprovider.TCPLoadBalancer, bool) {
 	return nil, false

pkg/cloudprovider/vagrant/vagrant.go

@@ -80,6 +80,10 @@ func newVagrantCloud() (*VagrantCloud, error) {
 	}, nil
 }
 
+func (aws *VagrantCloud) Clusters() (cloudprovider.Clusters, bool) {
+	return nil, false
+}
+
 // TCPLoadBalancer returns an implementation of TCPLoadBalancer for Vagrant cloud.
 func (v *VagrantCloud) TCPLoadBalancer() (cloudprovider.TCPLoadBalancer, bool) {
 	return nil, false