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Created new Broadcaser which start an informer to watch Nodes for Res…
…ourceOffer generation/update Add logic reacting after node add, update and delete Add ReadResources() function to read safely the cluster resources Added clusterconfig watcher to get scaling percentage. Refactor of resource writing to manage all kind of resources. Added new tests and fixed linting
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| package resourcerequestoperator | ||
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| import ( | ||
| "fmt" | ||
| "sync" | ||
|
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| crdclient "github.com/liqotech/liqo/pkg/crdClient" | ||
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| "k8s.io/client-go/kubernetes/scheme" | ||
| "k8s.io/client-go/rest" | ||
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| configv1alpha1 "github.com/liqotech/liqo/apis/config/v1alpha1" | ||
| "github.com/liqotech/liqo/pkg/utils" | ||
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| corev1 "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/api/resource" | ||
| "k8s.io/client-go/informers" | ||
| "k8s.io/client-go/kubernetes" | ||
| "k8s.io/client-go/tools/cache" | ||
| "k8s.io/klog" | ||
| ) | ||
|
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| // Broadcaster is an object which is used to get resources of the cluster. | ||
| type Broadcaster struct { | ||
| allocatable corev1.ResourceList | ||
| clusterConfig configv1alpha1.ClusterConfig | ||
| offerMutex sync.RWMutex | ||
| configMutex sync.RWMutex | ||
| } | ||
|
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| // SetupBroadcaster create the informer e run it to signal node changes updating Offers. | ||
| func (b *Broadcaster) SetupBroadcaster(clientset *kubernetes.Clientset, config *rest.Config, stopper chan struct{}) error { | ||
| b.allocatable = corev1.ResourceList{} | ||
| factory := informers.NewSharedInformerFactory(clientset, 0) | ||
| informer := factory.Core().V1().Nodes().Informer() | ||
| informer.AddEventHandler(cache.ResourceEventHandlerFuncs{ | ||
| AddFunc: b.onAdd, | ||
| UpdateFunc: b.onUpdate, | ||
| DeleteFunc: b.onDelete, | ||
| }) | ||
|
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| config.ContentConfig.GroupVersion = &configv1alpha1.GroupVersion | ||
| config.NegotiatedSerializer = scheme.Codecs.WithoutConversion() | ||
| config.UserAgent = rest.DefaultKubernetesUserAgent() | ||
| CRDclient, err := crdclient.NewFromConfig(config) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| go utils.WatchConfiguration(b.setConfig, CRDclient, "") | ||
| go informer.Run(stopper) | ||
| return nil | ||
| } | ||
|
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| func (b *Broadcaster) setConfig(configuration *configv1alpha1.ClusterConfig) { | ||
| b.configMutex.Lock() | ||
| defer b.configMutex.Unlock() | ||
| b.clusterConfig = *configuration | ||
| } | ||
|
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| // react to a Node Creation/First informer run. | ||
| func (b *Broadcaster) onAdd(obj interface{}) { | ||
| node := obj.(*corev1.Node) | ||
| toAdd := &node.Status.Allocatable | ||
| currentResources := b.allocatable.DeepCopy() | ||
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| for resourceName, quantity := range *toAdd { | ||
| value := currentResources[resourceName] | ||
| if !quantity.IsZero() { | ||
| value.Add(quantity) | ||
| } | ||
| currentResources[resourceName] = value | ||
| } | ||
|
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| if err := b.writeResources(currentResources); err != nil { | ||
| klog.Errorf("OnAdd error: unable to write allocatable of Node %s: %s", node.Name, err) | ||
| } | ||
| } | ||
|
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| // react to a Node Update. | ||
| func (b *Broadcaster) onUpdate(oldObj, newObj interface{}) { | ||
| oldNode := oldObj.(*corev1.Node) | ||
| newNode := newObj.(*corev1.Node) | ||
| oldNodeResources := oldNode.Status.Allocatable | ||
| newNodeResources := newNode.Status.Allocatable | ||
| currentResources := b.allocatable.DeepCopy() | ||
|
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| for resourceName, quantity := range newNodeResources { | ||
| oldQuantity := oldNodeResources[resourceName] | ||
| value := currentResources[resourceName] | ||
| if quantityToUpdate := resource.NewQuantity(quantity.Value()-oldQuantity.Value(), | ||
| quantity.Format); !quantityToUpdate.IsZero() { | ||
| value.Add(*quantityToUpdate) | ||
| } | ||
| currentResources[resourceName] = value | ||
| } | ||
|
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| if err := b.writeResources(currentResources); err != nil { | ||
| klog.Errorf("OnUpdate error: unable to write allocatable of Node %s: %s", newNode.Name, err) | ||
| } | ||
| } | ||
|
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| // react to a Node Delete. | ||
| func (b *Broadcaster) onDelete(obj interface{}) { | ||
| node := obj.(*corev1.Node) | ||
| toDelete := &node.Status.Allocatable | ||
| currentResources := b.allocatable.DeepCopy() | ||
|
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| for resourceName, quantity := range *toDelete { | ||
| value := currentResources[resourceName] | ||
| if !quantity.IsZero() { | ||
| value.Sub(quantity) | ||
| } | ||
| currentResources[resourceName] = value | ||
| } | ||
|
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| if err := b.writeResources(currentResources); err != nil { | ||
| klog.Errorf("OnAdd error: unable to write allocatable of Node %s: %s", node.Name, err) | ||
| } | ||
| } | ||
|
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| // write cluster resources in thread safe mode. | ||
| func (b *Broadcaster) writeResources(newResources corev1.ResourceList) error { | ||
| b.offerMutex.Lock() | ||
| defer b.offerMutex.Unlock() | ||
| if newResources != nil { | ||
| b.allocatable = newResources | ||
| return nil | ||
| } | ||
|
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| return fmt.Errorf("some error occurred during cluster resources read. Attempting writing nil resources") | ||
| } | ||
|
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| // ReadResources return in thread safe mode a scaled value of the resources. | ||
| func (b *Broadcaster) ReadResources() (corev1.ResourceList, error) { | ||
| b.offerMutex.RLock() | ||
| defer b.offerMutex.RUnlock() | ||
| if b.allocatable == nil { | ||
| return nil, fmt.Errorf("error getting cluster resources") | ||
| } | ||
| toRead := b.allocatable.DeepCopy() | ||
| for resourceName, quantity := range toRead { | ||
| scaled := quantity | ||
| b.scaleResources(&scaled) | ||
| toRead[resourceName] = scaled | ||
| } | ||
| return toRead, nil | ||
| } | ||
|
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| func (b *Broadcaster) scaleResources(quantity *resource.Quantity) { | ||
| b.configMutex.RLock() | ||
| percentage := int64(b.clusterConfig.Spec.AdvertisementConfig.OutgoingConfig.ResourceSharingPercentage) | ||
| b.configMutex.RUnlock() | ||
| if percentage == 0 { | ||
| return | ||
| } | ||
|
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| quantity.Set(quantity.Value() * percentage / 100) | ||
| } |
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