// WatchControllers begins watching for new, changed, or deleted controllers.
func (r *Registry) WatchControllers(ctx api.Context, label labels.Selector, field fields.Selector, resourceVersion string) (watch.Interface, error) {
if !field.Empty() {
return nil, fmt.Errorf("field selectors are not supported on replication controllers")
}
version, err := tools.ParseWatchResourceVersion(resourceVersion, "replicationControllers")
if err != nil {
return nil, err
}
key := makeControllerListKey(ctx)
return r.WatchList(key, version, func(obj runtime.Object) bool {
controller, ok := obj.(*api.ReplicationController)
if !ok {
// Must be an error: return true to propagate to upper level.
return true
}
match := label.Matches(labels.Set(controller.Labels))
if match {
pods, err := r.pods.ListPods(ctx, labels.Set(controller.Spec.Selector).AsSelector())
if err != nil {
glog.Warningf("Error listing pods: %v", err)
// No object that's useable so drop it on the floor
return false
}
if pods == nil {
glog.Warningf("Pods list is nil. This should never happen...")
// No object that's useable so drop it on the floor
return false
}
controller.Status.Replicas = len(pods.Items)
}
return match
})
}
// GetPodControllers returns a list of controllers managing a pod. Returns an error only if no matching controllers are found.
func (s *StoreToControllerLister) GetPodControllers(pod *api.Pod) (controllers []api.ReplicationController, err error) {
var selector labels.Selector
var rc api.ReplicationController
if len(pod.Labels) == 0 {
err = fmt.Errorf("No controllers found for pod %v because it has no labels", pod.Name)
return
}
for _, m := range s.Store.List() {
rc = *m.(*api.ReplicationController)
if rc.Namespace != pod.Namespace {
continue
}
labelSet := labels.Set(rc.Spec.Selector)
selector = labels.Set(rc.Spec.Selector).AsSelector()
// If an rc with a nil or empty selector creeps in, it should match nothing, not everything.
if labelSet.AsSelector().Empty() || !selector.Matches(labels.Set(pod.Labels)) {
continue
}
controllers = append(controllers, rc)
}
if len(controllers) == 0 {
err = fmt.Errorf("Could not find controllers for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
}
return
}
// TODO: Move this back to scheduler as a helper function that takes a Store,
// rather than a method of StoreToServiceLister.
func (s *StoreToServiceLister) GetPodServices(pod *api.Pod) (services []api.Service, err error) {
var selector labels.Selector
var service api.Service
for _, m := range s.Store.List() {
service = *m.(*api.Service)
// consider only services that are in the same namespace as the pod
if service.Namespace != pod.Namespace {
continue
}
if service.Spec.Selector == nil {
// services with nil selectors match nothing, not everything.
continue
}
selector = labels.Set(service.Spec.Selector).AsSelector()
if selector.Matches(labels.Set(pod.Labels)) {
services = append(services, service)
}
}
if len(services) == 0 {
err = fmt.Errorf("Could not find service for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
}
return
}
// List returns []*api.Pod matching a query.
func (f FakePodLister) List(s labels.Selector) (selected []*api.Pod, err error) {
for _, pod := range f {
if s.Matches(labels.Set(pod.Labels)) {
selected = append(selected, pod)
}
}
return selected, nil
}
// MatchPodTemplate returns a generic matcher for a given label and field selector.
func MatchPodTemplate(label labels.Selector, field fields.Selector) generic.Matcher {
return generic.MatcherFunc(func(obj runtime.Object) (bool, error) {
podObj, ok := obj.(*api.PodTemplate)
if !ok {
return false, fmt.Errorf("not a pod template")
}
return label.Matches(labels.Set(podObj.Labels)), nil
})
}
// MatchPersistentVolume returns a generic matcher for a given label and field selector.
func MatchPersistentVolumes(label labels.Selector, field fields.Selector) generic.Matcher {
return generic.MatcherFunc(func(obj runtime.Object) (bool, error) {
persistentvolumeObj, ok := obj.(*api.PersistentVolume)
if !ok {
return false, fmt.Errorf("not a persistentvolume")
}
fields := PersistentVolumeToSelectableFields(persistentvolumeObj)
return label.Matches(labels.Set(persistentvolumeObj.Labels)) && field.Matches(fields), nil
})
}
// MatchNamespace returns a generic matcher for a given label and field selector.
func MatchNamespace(label labels.Selector, field fields.Selector) generic.Matcher {
return generic.MatcherFunc(func(obj runtime.Object) (bool, error) {
namespaceObj, ok := obj.(*api.Namespace)
if !ok {
return false, fmt.Errorf("not a namespace")
}
fields := NamespaceToSelectableFields(namespaceObj)
return label.Matches(labels.Set(namespaceObj.Labels)) && field.Matches(fields), nil
})
}
// MatchResourceQuota returns a generic matcher for a given label and field selector.
func MatchResourceQuota(label labels.Selector, field fields.Selector) generic.Matcher {
return generic.MatcherFunc(func(obj runtime.Object) (bool, error) {
resourcequotaObj, ok := obj.(*api.ResourceQuota)
if !ok {
return false, fmt.Errorf("not a resourcequota")
}
fields := ResourceQuotaToSelectableFields(resourcequotaObj)
return label.Matches(labels.Set(resourcequotaObj.Labels)) && field.Matches(fields), nil
})
}
// Matcher returns a generic matcher for a given label and field selector.
func Matcher(label labels.Selector, field fields.Selector) generic.Matcher {
return generic.MatcherFunc(func(obj runtime.Object) (bool, error) {
sa, ok := obj.(*api.Secret)
if !ok {
return false, fmt.Errorf("not a secret")
}
fields := SelectableFields(sa)
return label.Matches(labels.Set(sa.Labels)) && field.Matches(fields), nil
})
}
// LabelsSelectorParam adds the given selector as a query parameter
func (r *Request) LabelsSelectorParam(s labels.Selector) *Request {
if r.err != nil {
return r
}
if s == nil {
return r
}
if s.Empty() {
return r
}
return r.setParam(api.LabelSelectorQueryParam(r.apiVersion), s.String())
}
// Please note that selector is filtering among the pods that have gotten into
// the store; there may have been some filtering that already happened before
// that.
func (s storePodsNamespacer) List(selector labels.Selector) (pods api.PodList, err error) {
list := api.PodList{}
for _, m := range s.store.List() {
pod := m.(*api.Pod)
if s.namespace == api.NamespaceAll || s.namespace == pod.Namespace {
if selector.Matches(labels.Set(pod.Labels)) {
list.Items = append(list.Items, *pod)
}
}
}
return list, nil
}
// Please note that selector is filtering among the pods that have gotten into
// the store; there may have been some filtering that already happened before
// that.
//
// TODO: converge on the interface in pkg/client.
func (s *StoreToPodLister) List(selector labels.Selector) (pods []*api.Pod, err error) {
// TODO: it'd be great to just call
// s.Pods(api.NamespaceAll).List(selector), however then we'd have to
// remake the list.Items as a []*api.Pod. So leave this separate for
// now.
for _, m := range s.Store.List() {
pod := m.(*api.Pod)
if selector.Matches(labels.Set(pod.Labels)) {
pods = append(pods, pod)
}
}
return pods, nil
}
func (rs *REST) List(ctx api.Context, label labels.Selector, field fields.Selector) (runtime.Object, error) {
list, err := rs.registry.ListServices(ctx)
if err != nil {
return nil, err
}
var filtered []api.Service
for _, service := range list.Items {
if label.Matches(labels.Set(service.Labels)) {
filtered = append(filtered, service)
}
}
list.Items = filtered
return list, err
}
// GetPodServices gets the services that have the selector that match the labels on the given pod
func (f FakeServiceLister) GetPodServices(pod *api.Pod) (services []api.Service, err error) {
var selector labels.Selector
for _, service := range f {
// consider only services that are in the same namespace as the pod
if service.Namespace != pod.Namespace {
continue
}
selector = labels.Set(service.Spec.Selector).AsSelector()
if selector.Matches(labels.Set(pod.Labels)) {
services = append(services, service)
}
}
if len(services) == 0 {
err = fmt.Errorf("Could not find service for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
}
return
}
// WatchServices begins watching for new, changed, or deleted service configurations.
func (r *Registry) WatchServices(ctx api.Context, label labels.Selector, field fields.Selector, resourceVersion string) (watch.Interface, error) {
version, err := tools.ParseWatchResourceVersion(resourceVersion, "service")
if err != nil {
return nil, err
}
if !label.Empty() {
return nil, fmt.Errorf("label selectors are not supported on services")
}
if value, found := field.RequiresExactMatch("name"); found {
key, err := makeServiceKey(ctx, value)
if err != nil {
return nil, err
}
// TODO: use generic.SelectionPredicate
return r.Watch(key, version, tools.Everything)
}
if field.Empty() {
return r.WatchList(makeServiceListKey(ctx), version, tools.Everything)
}
return nil, fmt.Errorf("only the 'name' and default (everything) field selectors are supported")
}
// CheckServiceAffinity ensures that only the minions that match the specified labels are considered for scheduling.
// The set of labels to be considered are provided to the struct (ServiceAffinity).
// The pod is checked for the labels and any missing labels are then checked in the minion
// that hosts the service pods (peers) for the given pod.
//
// We add an implicit selector requiring some particular value V for label L to a pod, if:
// - L is listed in the ServiceAffinity object that is passed into the function
// - the pod does not have any NodeSelector for L
// - some other pod from the same service is already scheduled onto a minion that has value V for label L
func (s *ServiceAffinity) CheckServiceAffinity(pod *api.Pod, existingPods []*api.Pod, node string) (bool, error) {
var affinitySelector labels.Selector
// check if the pod being scheduled has the affinity labels specified in its NodeSelector
affinityLabels := map[string]string{}
nodeSelector := labels.Set(pod.Spec.NodeSelector)
labelsExist := true
for _, l := range s.labels {
if nodeSelector.Has(l) {
affinityLabels[l] = nodeSelector.Get(l)
} else {
// the current pod does not specify all the labels, look in the existing service pods
labelsExist = false
}
}
// skip looking at other pods in the service if the current pod defines all the required affinity labels
if !labelsExist {
services, err := s.serviceLister.GetPodServices(pod)
if err == nil {
// just use the first service and get the other pods within the service
// TODO: a separate predicate can be created that tries to handle all services for the pod
selector := labels.SelectorFromSet(services[0].Spec.Selector)
servicePods, err := s.podLister.List(selector)
if err != nil {
return false, err
}
// consider only the pods that belong to the same namespace
nsServicePods := []*api.Pod{}
for _, nsPod := range servicePods {
if nsPod.Namespace == pod.Namespace {
nsServicePods = append(nsServicePods, nsPod)
}
}
if len(nsServicePods) > 0 {
// consider any service pod and fetch the minion its hosted on
otherMinion, err := s.nodeInfo.GetNodeInfo(nsServicePods[0].Spec.NodeName)
if err != nil {
return false, err
}
for _, l := range s.labels {
// If the pod being scheduled has the label value specified, do not override it
if _, exists := affinityLabels[l]; exists {
continue
}
if labels.Set(otherMinion.Labels).Has(l) {
affinityLabels[l] = labels.Set(otherMinion.Labels).Get(l)
}
}
}
}
}
// if there are no existing pods in the service, consider all minions
if len(affinityLabels) == 0 {
affinitySelector = labels.Everything()
} else {
affinitySelector = labels.Set(affinityLabels).AsSelector()
}
minion, err := s.nodeInfo.GetNodeInfo(node)
if err != nil {
return false, err
}
// check if the minion matches the selector
return affinitySelector.Matches(labels.Set(minion.Labels)), nil
}
func (r *PodRegistry) ListPods(ctx api.Context, selector labels.Selector) (*api.PodList, error) {
return r.ListPodsPredicate(ctx, func(pod *api.Pod) bool {
return selector.Matches(labels.Set(pod.Labels))
})
}
