| /* |
| Copyright 2016 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 azure |
| |
| import ( |
| "context" |
| "fmt" |
| "strconv" |
| "strings" |
| |
| "k8s.io/apimachinery/pkg/types" |
| cloudprovider "k8s.io/cloud-provider" |
| "k8s.io/klog" |
| ) |
| |
| // makeZone returns the zone value in format of <region>-<zone-id>. |
| func (az *Cloud) makeZone(zoneID int) string { |
| return fmt.Sprintf("%s-%d", strings.ToLower(az.Location), zoneID) |
| } |
| |
| // isAvailabilityZone returns true if the zone is in format of <region>-<zone-id>. |
| func (az *Cloud) isAvailabilityZone(zone string) bool { |
| return strings.HasPrefix(zone, fmt.Sprintf("%s-", az.Location)) |
| } |
| |
| // GetZoneID returns the ID of zone from node's zone label. |
| func (az *Cloud) GetZoneID(zoneLabel string) string { |
| if !az.isAvailabilityZone(zoneLabel) { |
| return "" |
| } |
| |
| return strings.TrimPrefix(zoneLabel, fmt.Sprintf("%s-", az.Location)) |
| } |
| |
| // GetZone returns the Zone containing the current availability zone and locality region that the program is running in. |
| // If the node is not running with availability zones, then it will fall back to fault domain. |
| func (az *Cloud) GetZone(ctx context.Context) (cloudprovider.Zone, error) { |
| metadata, err := az.metadata.GetMetadata() |
| if err != nil { |
| return cloudprovider.Zone{}, err |
| } |
| |
| if metadata.Compute == nil { |
| return cloudprovider.Zone{}, fmt.Errorf("failure of getting compute information from instance metadata") |
| } |
| |
| zone := "" |
| if metadata.Compute.Zone != "" { |
| zoneID, err := strconv.Atoi(metadata.Compute.Zone) |
| if err != nil { |
| return cloudprovider.Zone{}, fmt.Errorf("failed to parse zone ID %q: %v", metadata.Compute.Zone, err) |
| } |
| zone = az.makeZone(zoneID) |
| } else { |
| klog.V(3).Infof("Availability zone is not enabled for the node, falling back to fault domain") |
| zone = metadata.Compute.FaultDomain |
| } |
| |
| return cloudprovider.Zone{ |
| FailureDomain: zone, |
| Region: az.Location, |
| }, nil |
| } |
| |
| // GetZoneByProviderID implements Zones.GetZoneByProviderID |
| // This is particularly useful in external cloud providers where the kubelet |
| // does not initialize node data. |
| func (az *Cloud) GetZoneByProviderID(ctx context.Context, providerID string) (cloudprovider.Zone, error) { |
| // Returns nil for unmanaged nodes because azure cloud provider couldn't fetch information for them. |
| if az.IsNodeUnmanagedByProviderID(providerID) { |
| klog.V(2).Infof("GetZoneByProviderID: omitting unmanaged node %q", providerID) |
| return cloudprovider.Zone{}, nil |
| } |
| |
| nodeName, err := az.vmSet.GetNodeNameByProviderID(providerID) |
| if err != nil { |
| return cloudprovider.Zone{}, err |
| } |
| |
| return az.GetZoneByNodeName(ctx, nodeName) |
| } |
| |
| // GetZoneByNodeName implements Zones.GetZoneByNodeName |
| // This is particularly useful in external cloud providers where the kubelet |
| // does not initialize node data. |
| func (az *Cloud) GetZoneByNodeName(ctx context.Context, nodeName types.NodeName) (cloudprovider.Zone, error) { |
| // Returns "" for unmanaged nodes because azure cloud provider couldn't fetch information for them. |
| unmanaged, err := az.IsNodeUnmanaged(string(nodeName)) |
| if err != nil { |
| return cloudprovider.Zone{}, err |
| } |
| if unmanaged { |
| klog.V(2).Infof("GetZoneByNodeName: omitting unmanaged node %q", nodeName) |
| return cloudprovider.Zone{}, nil |
| } |
| |
| return az.vmSet.GetZoneByNodeName(string(nodeName)) |
| } |