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Merge pull request #153 from wallrj/152-cassandra-pilot-resource
Automatic merge from submit-queue.
Create Cassandra Pilot resources
* For every pod in the nodepool, create a corresponding Pilot resource.
* Delete Pilot resources for which there is no corresponding Pod.
* Ignore Pods that are not owned by the cluster.
* Stop and error if we encounter Pilots with expected name, but not owned by the cluster.
Fixes: #152
**Release note**:
```release-note
NONE
```- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,182 @@ | ||
| package pilot | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "hash/fnv" | ||
| "reflect" | ||
|
|
||
| "github.com/jetstack/navigator/pkg/apis/navigator/v1alpha1" | ||
| navigator "github.com/jetstack/navigator/pkg/client/clientset/versioned" | ||
| navlisters "github.com/jetstack/navigator/pkg/client/listers/navigator/v1alpha1" | ||
| "github.com/jetstack/navigator/pkg/controllers" | ||
| "github.com/jetstack/navigator/pkg/controllers/cassandra/util" | ||
| hashutil "github.com/jetstack/navigator/pkg/util/hash" | ||
| "k8s.io/api/core/v1" | ||
| k8sErrors "k8s.io/apimachinery/pkg/api/errors" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/labels" | ||
| appslisters "k8s.io/client-go/listers/apps/v1beta1" | ||
| corelisters "k8s.io/client-go/listers/core/v1" | ||
| "k8s.io/client-go/tools/record" | ||
| ) | ||
|
|
||
| const ( | ||
| HashAnnotationKey = "navigator.jetstack.io/cassandra-pilot-hash" | ||
| ) | ||
|
|
||
| type Interface interface { | ||
| Sync(*v1alpha1.CassandraCluster) error | ||
| } | ||
|
|
||
| type pilotControl struct { | ||
| naviClient navigator.Interface | ||
| pilots navlisters.PilotLister | ||
| pods corelisters.PodLister | ||
| statefulSets appslisters.StatefulSetLister | ||
| recorder record.EventRecorder | ||
| } | ||
|
|
||
| var _ Interface = &pilotControl{} | ||
|
|
||
| func NewControl( | ||
| naviClient navigator.Interface, | ||
| pilots navlisters.PilotLister, | ||
| pods corelisters.PodLister, | ||
| statefulSets appslisters.StatefulSetLister, | ||
| recorder record.EventRecorder, | ||
| ) *pilotControl { | ||
| return &pilotControl{ | ||
| naviClient: naviClient, | ||
| pilots: pilots, | ||
| pods: pods, | ||
| statefulSets: statefulSets, | ||
| recorder: recorder, | ||
| } | ||
|
|
||
| } | ||
|
|
||
| func (c *pilotControl) clusterPods(cluster *v1alpha1.CassandraCluster) ([]*v1.Pod, error) { | ||
| var clusterPods []*v1.Pod | ||
| allPods, err := c.pods.Pods(cluster.Namespace).List(labels.Everything()) | ||
| if err != nil { | ||
| return clusterPods, err | ||
| } | ||
| for _, pod := range allPods { | ||
| podControlledByCluster, err := controllers.PodControlledByCluster( | ||
| cluster, | ||
| pod, | ||
| c.statefulSets, | ||
| ) | ||
| if err != nil { | ||
| return clusterPods, err | ||
| } | ||
| if !podControlledByCluster { | ||
| continue | ||
| } | ||
| clusterPods = append(clusterPods, pod) | ||
| } | ||
| return clusterPods, nil | ||
| } | ||
|
|
||
| func (c *pilotControl) createOrUpdatePilot(cluster *v1alpha1.CassandraCluster, pod *v1.Pod) error { | ||
| desiredPilot := PilotForCluster(cluster, pod) | ||
| client := c.naviClient.NavigatorV1alpha1().Pilots(desiredPilot.GetNamespace()) | ||
| lister := c.pilots.Pilots(desiredPilot.GetNamespace()) | ||
| existingPilot, err := lister.Get(desiredPilot.GetName()) | ||
| if k8sErrors.IsNotFound(err) { | ||
| _, err = client.Create(desiredPilot) | ||
| return err | ||
| } | ||
| if err != nil { | ||
| return err | ||
| } | ||
| err = util.OwnerCheck(existingPilot, cluster) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| existingPilot = existingPilot.DeepCopy() | ||
| existingPilot.Status = v1alpha1.PilotStatus{} | ||
| desiredPilot = existingPilot.DeepCopy() | ||
| desiredPilot = updatePilotForCluster(cluster, pod, desiredPilot) | ||
| if !reflect.DeepEqual(desiredPilot, existingPilot) { | ||
| _, err = client.Update(desiredPilot) | ||
| } | ||
| return err | ||
| } | ||
|
|
||
| func (c *pilotControl) syncPilots(cluster *v1alpha1.CassandraCluster) error { | ||
| pods, err := c.clusterPods(cluster) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for _, pod := range pods { | ||
| err = c.createOrUpdatePilot(cluster, pod) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return err | ||
| } | ||
|
|
||
| func (c *pilotControl) Sync(cluster *v1alpha1.CassandraCluster) error { | ||
| err := c.syncPilots(cluster) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| // TODO: Housekeeping. Remove pilots that don't have a corresponding pod. | ||
| return nil | ||
| } | ||
|
|
||
| func PilotForCluster(cluster *v1alpha1.CassandraCluster, pod *v1.Pod) *v1alpha1.Pilot { | ||
| pilot := &v1alpha1.Pilot{} | ||
| pilot.SetOwnerReferences( | ||
| []metav1.OwnerReference{ | ||
| util.NewControllerRef(cluster), | ||
| }, | ||
| ) | ||
| return updatePilotForCluster(cluster, pod, pilot) | ||
| } | ||
|
|
||
| func updatePilotForCluster( | ||
| cluster *v1alpha1.CassandraCluster, | ||
| pod *v1.Pod, | ||
| pilot *v1alpha1.Pilot, | ||
| ) *v1alpha1.Pilot { | ||
| pilot.SetName(pod.GetName()) | ||
| pilot.SetNamespace(cluster.GetNamespace()) | ||
| labels := pilot.GetLabels() | ||
| if labels == nil { | ||
| labels = map[string]string{} | ||
| } | ||
| for key, val := range util.ClusterLabels(cluster) { | ||
| labels[key] = val | ||
| } | ||
| pilot.SetLabels(labels) | ||
| ComputeHashAndUpdateAnnotation(pilot) | ||
| return pilot | ||
| } | ||
|
|
||
| func ComputeHash(p *v1alpha1.Pilot) uint32 { | ||
| hashVar := []interface{}{ | ||
| p.Spec, | ||
| p.ObjectMeta, | ||
| p.Labels, | ||
| } | ||
| hasher := fnv.New32() | ||
| hashutil.DeepHashObject(hasher, hashVar) | ||
| return hasher.Sum32() | ||
| } | ||
|
|
||
| func UpdateHashAnnotation(p *v1alpha1.Pilot, hash uint32) { | ||
| annotations := p.GetAnnotations() | ||
| if annotations == nil { | ||
| annotations = map[string]string{} | ||
| } | ||
| annotations[HashAnnotationKey] = fmt.Sprintf("%d", hash) | ||
| p.SetAnnotations(annotations) | ||
| } | ||
|
|
||
| func ComputeHashAndUpdateAnnotation(p *v1alpha1.Pilot) { | ||
| hash := ComputeHash(p) | ||
| UpdateHashAnnotation(p, hash) | ||
| } |
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