mirror of
https://github.com/k3s-io/kubernetes.git
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117 lines
3.8 KiB
Go
117 lines
3.8 KiB
Go
/*
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Copyright 2018 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 kubelet
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import (
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"context"
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"fmt"
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"sync"
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"time"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/kubernetes/pkg/cloudprovider"
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"github.com/golang/glog"
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)
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var nodeAddressesRetryPeriod = 5 * time.Second
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type cloudResourceSyncManager struct {
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// Cloud provider interface.
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cloud cloudprovider.Interface
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// Sync period
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syncPeriod time.Duration
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nodeAddressesMux sync.Mutex
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nodeAddressesErr error
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nodeAddresses []v1.NodeAddress
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nodeName types.NodeName
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}
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// NewCloudResourceSyncManager creates a manager responsible for collecting resources
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// from a cloud provider through requests that are sensitive to timeouts and hanging
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func NewCloudResourceSyncManager(cloud cloudprovider.Interface, nodeName types.NodeName, syncPeriod time.Duration) *cloudResourceSyncManager {
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return &cloudResourceSyncManager{
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cloud: cloud,
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syncPeriod: syncPeriod,
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nodeName: nodeName,
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}
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}
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func (manager *cloudResourceSyncManager) getNodeAddressSafe() ([]v1.NodeAddress, error) {
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manager.nodeAddressesMux.Lock()
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defer manager.nodeAddressesMux.Unlock()
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return manager.nodeAddresses, manager.nodeAddressesErr
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}
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func (manager *cloudResourceSyncManager) setNodeAddressSafe(nodeAddresses []v1.NodeAddress, err error) {
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manager.nodeAddressesMux.Lock()
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defer manager.nodeAddressesMux.Unlock()
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manager.nodeAddresses = nodeAddresses
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manager.nodeAddressesErr = err
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}
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// NodeAddresses does not wait for cloud provider to return a node addresses.
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// It always returns node addresses or an error.
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func (manager *cloudResourceSyncManager) NodeAddresses() ([]v1.NodeAddress, error) {
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// wait until there is something
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for {
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nodeAddresses, err := manager.getNodeAddressSafe()
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if len(nodeAddresses) == 0 && err == nil {
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glog.V(5).Infof("Waiting for %v for cloud provider to provide node addresses", nodeAddressesRetryPeriod)
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time.Sleep(nodeAddressesRetryPeriod)
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continue
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}
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return nodeAddresses, err
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}
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}
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func (manager *cloudResourceSyncManager) collectNodeAddresses(ctx context.Context, nodeName types.NodeName) {
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glog.V(2).Infof("Requesting node addresses from cloud provider for node %q", nodeName)
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instances, ok := manager.cloud.Instances()
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if !ok {
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manager.setNodeAddressSafe(nil, fmt.Errorf("failed to get instances from cloud provider"))
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return
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}
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// TODO(roberthbailey): Can we do this without having credentials to talk
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// to the cloud provider?
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// TODO(justinsb): We can if CurrentNodeName() was actually CurrentNode() and returned an interface
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// TODO: If IP addresses couldn't be fetched from the cloud provider, should kubelet fallback on the other methods for getting the IP below?
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nodeAddresses, err := instances.NodeAddresses(ctx, nodeName)
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if err != nil {
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manager.setNodeAddressSafe(nil, fmt.Errorf("failed to get node address from cloud provider: %v", err))
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glog.V(2).Infof("Node addresses from cloud provider for node %q not collected", nodeName)
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} else {
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manager.setNodeAddressSafe(nodeAddresses, nil)
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glog.V(2).Infof("Node addresses from cloud provider for node %q collected", nodeName)
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}
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}
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func (manager *cloudResourceSyncManager) Run(stopCh <-chan struct{}) {
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wait.Until(func() {
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manager.collectNodeAddresses(context.TODO(), manager.nodeName)
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}, manager.syncPeriod, stopCh)
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}
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