Implement GetZoneByProviderID & GetZoneByNodeName

Adding an implementation of GetZoneByProviderID & GetZoneByNodeName for
GCE.
This is related to ticket 50926.
This was tested as part of the ongoing separate GCE cloud provider work.

Added unit test.
Fix for wojtek-t (borrowed from FengyunPan)

pkg/cloudprovider/providers/gce/gce_test.go

@@ -27,6 +27,7 @@ import (
 	computealpha "google.golang.org/api/compute/v0.alpha"
 	computebeta "google.golang.org/api/compute/v0.beta"
 	computev1 "google.golang.org/api/compute/v1"
+	"k8s.io/kubernetes/pkg/cloudprovider"
 )
 
 func TestReadConfigFile(t *testing.T) {
@@ -281,7 +282,7 @@ func TestSplitProviderID(t *testing.T) {
 	for _, test := range providers {
 		project, zone, instance, err := splitProviderID(test.providerID)
 		if (err != nil) != test.fail {
-			t.Errorf("Expected to failt=%t, with pattern %v", test.fail, test)
+			t.Errorf("Expected to fail=%t, with pattern %v", test.fail, test)
 		}
 
 		if test.fail {
@@ -300,6 +301,61 @@ func TestSplitProviderID(t *testing.T) {
 	}
 }
 
+func TestGetZoneByProviderID(t *testing.T) {
+	tests := []struct {
+		providerID string
+
+		expectedZone cloudprovider.Zone
+
+		fail        bool
+		description string
+	}{
+		{
+			providerID:   ProviderName + "://project-example-164317/us-central1-f/kubernetes-node-fhx1",
+			expectedZone: cloudprovider.Zone{FailureDomain: "us-central1-f", Region: "us-central1"},
+			fail:         false,
+			description:  "standard gce providerID",
+		},
+		{
+			providerID:   ProviderName + "://project-example-164317/us-central1-f/kubernetes-node-fhx1/",
+			expectedZone: cloudprovider.Zone{},
+			fail:         true,
+			description:  "too many slashes('/') trailing",
+		},
+		{
+			providerID:   ProviderName + "://project-example.164317//kubernetes-node-fhx1",
+			expectedZone: cloudprovider.Zone{},
+			fail:         true,
+			description:  "too many slashes('/') embedded",
+		},
+		{
+			providerID:   ProviderName + "://project-example-164317/uscentral1f/kubernetes-node-fhx1",
+			expectedZone: cloudprovider.Zone{},
+			fail:         true,
+			description:  "invalid name of the GCE zone",
+		},
+	}
+
+	gce := &GCECloud{
+		localZone: "us-central1-f",
+		region:    "us-central1",
+	}
+	for _, test := range tests {
+		zone, err := gce.GetZoneByProviderID(test.providerID)
+		if (err != nil) != test.fail {
+			t.Errorf("Expected to fail=%t, provider ID %v, tests %s", test.fail, test, test.description)
+		}
+
+		if test.fail {
+			continue
+		}
+
+		if zone != test.expectedZone {
+			t.Errorf("Expected %v, but got %v", test.expectedZone, zone)
+		}
+	}
+}
+
 func TestGenerateCloudConfigs(t *testing.T) {
 	configBoilerplate := ConfigGlobal{
 		TokenURL:           "",

pkg/cloudprovider/providers/gce/gce_zones.go

@@ -17,7 +17,6 @@ limitations under the License.
 package gce
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 
@@ -43,14 +42,31 @@ func (gce *GCECloud) GetZone() (cloudprovider.Zone, error) {
 // This is particularly useful in external cloud providers where the kubelet
 // does not initialize node data.
 func (gce *GCECloud) GetZoneByProviderID(providerID string) (cloudprovider.Zone, error) {
-	return cloudprovider.Zone{}, errors.New("GetZoneByProviderID not implemented")
+	_, zone, _, err := splitProviderID(providerID)
+	if err != nil {
+		return cloudprovider.Zone{}, err
+	}
+	region, err := GetGCERegion(zone)
+	if err != nil {
+		return cloudprovider.Zone{}, err
+	}
+	return cloudprovider.Zone{FailureDomain: zone, Region: region}, nil
 }
 
 // GetZoneByNodeName implements Zones.GetZoneByNodeName
 // This is particularly useful in external cloud providers where the kubelet
 // does not initialize node data.
 func (gce *GCECloud) GetZoneByNodeName(nodeName types.NodeName) (cloudprovider.Zone, error) {
-	return cloudprovider.Zone{}, errors.New("GetZoneByNodeName not imeplemented")
+	instanceName := mapNodeNameToInstanceName(nodeName)
+	instance, err := gce.getInstanceByName(instanceName)
+	if err != nil {
+		return cloudprovider.Zone{}, err
+	}
+	region, err := GetGCERegion(instance.Zone)
+	if err != nil {
+		return cloudprovider.Zone{}, err
+	}
+	return cloudprovider.Zone{FailureDomain: instance.Zone, Region: region}, nil
 }
 
 // ListZonesInRegion returns all zones in a GCP region