e18e8ec3c0
This adds context to all the relevant cloud provider interface signatures. Callers of those APIs are currently satisfied using context.TODO(). There will be follow on PRs to push the context through the stack. For an idea of the full scope of this change please look at PR #58532.
105 lines
2.8 KiB
Go
105 lines
2.8 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package azure
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import (
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"context"
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"encoding/json"
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"io"
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"io/ioutil"
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"net/http"
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"sync"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/kubernetes/pkg/cloudprovider"
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)
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const instanceInfoURL = "http://169.254.169.254/metadata/v1/InstanceInfo"
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var faultMutex = &sync.Mutex{}
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var faultDomain *string
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type instanceInfo struct {
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ID string `json:"ID"`
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UpdateDomain string `json:"UD"`
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FaultDomain string `json:"FD"`
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}
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// GetZone returns the Zone containing the current failure zone and locality region that the program is running in
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func (az *Cloud) GetZone(ctx context.Context) (cloudprovider.Zone, error) {
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return az.getZoneFromURL(instanceInfoURL)
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}
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// This is injectable for testing.
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func (az *Cloud) getZoneFromURL(url string) (cloudprovider.Zone, error) {
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faultMutex.Lock()
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defer faultMutex.Unlock()
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if faultDomain == nil {
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var err error
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faultDomain, err = fetchFaultDomain(url)
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if err != nil {
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return cloudprovider.Zone{}, err
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}
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}
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zone := cloudprovider.Zone{
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FailureDomain: *faultDomain,
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Region: az.Location,
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}
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return zone, nil
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}
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// GetZoneByProviderID implements Zones.GetZoneByProviderID
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// This is particularly useful in external cloud providers where the kubelet
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// does not initialize node data.
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func (az *Cloud) GetZoneByProviderID(ctx context.Context, providerID string) (cloudprovider.Zone, error) {
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nodeName, err := az.vmSet.GetNodeNameByProviderID(providerID)
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if err != nil {
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return cloudprovider.Zone{}, err
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}
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return az.GetZoneByNodeName(ctx, nodeName)
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}
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// GetZoneByNodeName implements Zones.GetZoneByNodeName
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// This is particularly useful in external cloud providers where the kubelet
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// does not initialize node data.
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func (az *Cloud) GetZoneByNodeName(ctx context.Context, nodeName types.NodeName) (cloudprovider.Zone, error) {
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return az.vmSet.GetZoneByNodeName(string(nodeName))
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}
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func fetchFaultDomain(url string) (*string, error) {
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resp, err := http.Get(url)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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return readFaultDomain(resp.Body)
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}
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func readFaultDomain(reader io.Reader) (*string, error) {
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var instanceInfo instanceInfo
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body, err := ioutil.ReadAll(reader)
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if err != nil {
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return nil, err
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}
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err = json.Unmarshal(body, &instanceInfo)
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if err != nil {
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return nil, err
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}
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return &instanceInfo.FaultDomain, nil
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}
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