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| 1 | +package linode |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "net/http" |
| 6 | + "time" |
| 7 | + |
| 8 | + "github.com/appscode/go/wait" |
| 9 | + "github.com/linode/linodego" |
| 10 | + v1 "k8s.io/api/core/v1" |
| 11 | + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| 12 | + v1informers "k8s.io/client-go/informers/core/v1" |
| 13 | + "k8s.io/client-go/kubernetes" |
| 14 | + "k8s.io/client-go/tools/cache" |
| 15 | + "k8s.io/client-go/util/workqueue" |
| 16 | + "k8s.io/klog/v2" |
| 17 | +) |
| 18 | + |
| 19 | +type nodeController struct { |
| 20 | + client Client |
| 21 | + instances *instances |
| 22 | + kubeclient kubernetes.Interface |
| 23 | + informer v1informers.NodeInformer |
| 24 | + |
| 25 | + queue workqueue.DelayingInterface |
| 26 | +} |
| 27 | + |
| 28 | +func newNodeController(kubeclient kubernetes.Interface, client Client, informer v1informers.NodeInformer) *nodeController { |
| 29 | + return &nodeController{ |
| 30 | + client: client, |
| 31 | + instances: newInstances(client), |
| 32 | + kubeclient: kubeclient, |
| 33 | + informer: informer, |
| 34 | + queue: workqueue.NewDelayingQueue(), |
| 35 | + } |
| 36 | +} |
| 37 | + |
| 38 | +func (s *nodeController) Run(stopCh <-chan struct{}) { |
| 39 | + s.informer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{ |
| 40 | + AddFunc: func(obj interface{}) { |
| 41 | + node, ok := obj.(*v1.Node) |
| 42 | + if !ok { |
| 43 | + return |
| 44 | + } |
| 45 | + |
| 46 | + klog.Infof("NodeController will handle newly created node (%s) metadata", node.Name) |
| 47 | + s.queue.Add(node) |
| 48 | + }, |
| 49 | + UpdateFunc: func(_, new interface{}) { |
| 50 | + node, ok := new.(*v1.Node) |
| 51 | + if !ok { |
| 52 | + return |
| 53 | + } |
| 54 | + |
| 55 | + klog.Infof("NodeController will handle updated node (%s) metadata", node.Name) |
| 56 | + s.queue.Add(node) |
| 57 | + }, |
| 58 | + }) |
| 59 | + |
| 60 | + go wait.Until(s.worker, time.Second, stopCh) |
| 61 | + s.informer.Informer().Run(stopCh) |
| 62 | +} |
| 63 | + |
| 64 | +// worker runs a worker thread that dequeues new or modified nodes and processes |
| 65 | +// metadata (host UUID) on each of them. |
| 66 | +func (s *nodeController) worker() { |
| 67 | + for s.processNext() { |
| 68 | + } |
| 69 | +} |
| 70 | + |
| 71 | +func (s *nodeController) processNext() bool { |
| 72 | + key, quit := s.queue.Get() |
| 73 | + if quit { |
| 74 | + return false |
| 75 | + } |
| 76 | + defer s.queue.Done(key) |
| 77 | + |
| 78 | + node, ok := key.(*v1.Node) |
| 79 | + if !ok { |
| 80 | + klog.Errorf("expected dequeued key to be of type *v1.Node but got %T", node) |
| 81 | + return true |
| 82 | + } |
| 83 | + |
| 84 | + err := s.handleNodeAdded(context.TODO(), node) |
| 85 | + switch deleteErr := err.(type) { |
| 86 | + case nil: |
| 87 | + break |
| 88 | + |
| 89 | + case *linodego.Error: |
| 90 | + if deleteErr.Code >= http.StatusInternalServerError || deleteErr.Code == http.StatusTooManyRequests { |
| 91 | + klog.Errorf("failed to add metadata for node (%s); retrying in 1 minute: %s", node.Name, err) |
| 92 | + s.queue.AddAfter(node, retryInterval) |
| 93 | + } |
| 94 | + |
| 95 | + default: |
| 96 | + klog.Errorf("failed to add metadata for node (%s); will not retry: %s", node.Name, err) |
| 97 | + } |
| 98 | + return true |
| 99 | +} |
| 100 | + |
| 101 | +func (s *nodeController) handleNodeAdded(ctx context.Context, node *v1.Node) error { |
| 102 | + klog.Infof("NodeController handling node (%s) addition", node.Name) |
| 103 | + |
| 104 | + linode, err := s.instances.lookupLinode(ctx, node) |
| 105 | + if err != nil { |
| 106 | + klog.Infof("instance lookup error: %s", err.Error()) |
| 107 | + return err |
| 108 | + } |
| 109 | + |
| 110 | + uuid, ok := node.Labels[annLinodeHostUUID] |
| 111 | + if ok && uuid == linode.HostUUID { |
| 112 | + return nil |
| 113 | + } |
| 114 | + |
| 115 | + node.Labels[annLinodeHostUUID] = linode.HostUUID |
| 116 | + |
| 117 | + _, err = s.kubeclient.CoreV1().Nodes().Update(ctx, node, metav1.UpdateOptions{}) |
| 118 | + if err != nil { |
| 119 | + klog.Infof("node update error: %s", err.Error()) |
| 120 | + return err |
| 121 | + } |
| 122 | + |
| 123 | + return nil |
| 124 | +} |
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