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a6741ea743
Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Prevent deadlock on azure zone fetch in presence of failure **What this PR does / why we need it**: This fixes a bug in the Zone get function for the Azure cloud provider. **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes # **Special notes for your reviewer**: **Release note**: ```release-note Fix deadlock in azure cloud provider zone fetching ```
114 lines
3.0 KiB
Go
114 lines
3.0 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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"encoding/json"
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"io"
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"io/ioutil"
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"net/http"
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"strconv"
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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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"github.com/Azure/azure-sdk-for-go/arm/compute"
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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() (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()
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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(providerID string) (cloudprovider.Zone, error) {
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nodeName, err := splitProviderID(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(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(nodeName types.NodeName) (cloudprovider.Zone, error) {
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vm, err := az.VirtualMachinesClient.Get(az.ResourceGroup, string(nodeName), compute.InstanceView)
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if err != nil {
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return cloudprovider.Zone{}, err
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}
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failureDomain := strconv.Itoa(int(*vm.VirtualMachineProperties.InstanceView.PlatformFaultDomain))
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zone := cloudprovider.Zone{
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FailureDomain: failureDomain,
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Region: *(vm.Location),
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}
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return zone, nil
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}
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func fetchFaultDomain() (*string, error) {
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resp, err := http.Get(instanceInfoURL)
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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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