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label.go
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label.go
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package k8s
import (
"reflect"
"github.com/windmilleng/tilt/internal/model"
appsv1beta1 "k8s.io/api/apps/v1beta1"
appsv1beta2 "k8s.io/api/apps/v1beta2"
v1 "k8s.io/api/core/v1"
extv1beta1 "k8s.io/api/extensions/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
)
func makeLabelSet(lps []model.LabelPair) labels.Set {
ls := labels.Set{}
for _, lp := range lps {
ls[lp.Key] = lp.Value
}
return ls
}
func makeLabelSelector(lps []model.LabelPair) string {
return labels.SelectorFromSet(makeLabelSet(lps)).String()
}
func InjectLabels(entity K8sEntity, labels []model.LabelPair) (K8sEntity, error) {
return injectLabels(entity, labels, false)
}
func OverwriteLabels(entity K8sEntity, labels []model.LabelPair) (K8sEntity, error) {
return injectLabels(entity, labels, true)
}
// injectLabels injects the given labels into the given k8sEntity
// (if `overwrite`, replacing existing labels)
func injectLabels(entity K8sEntity, labels []model.LabelPair, overwrite bool) (K8sEntity, error) {
entity = entity.DeepCopy()
switch obj := entity.Obj.(type) {
case *appsv1beta1.Deployment:
allowLabelChangesInAppsDeploymentBeta1(obj)
case *appsv1beta2.Deployment:
allowLabelChangesInAppsDeploymentBeta2(obj)
case *extv1beta1.Deployment:
allowLabelChangesInExtDeploymentBeta1(obj)
}
// Don't modify persistent volume claims
// because they're supposed to be immutable.
pvc := reflect.TypeOf(v1.PersistentVolumeClaim{})
metas, err := extractObjectMetas(&entity, func(v reflect.Value) bool {
return v.Type() != pvc
})
if err != nil {
return K8sEntity{}, err
}
for _, meta := range metas {
if overwrite {
meta.Labels = nil
}
for _, label := range labels {
if meta.Labels == nil {
meta.Labels = make(map[string]string, 1)
}
meta.Labels[label.Key] = label.Value
}
}
return entity, nil
}
// In the v1beta1 API, if a Deployment didn't have a selector,
// Kubernetes would automatically infer a selector based on the labels
// in the pod.
//
// The problem is that Selectors are immutable. So this had the unintended
// side-effect of making pod labels immutable. Since many tools attach
// arbitrary labels to pods, v1beta1 Deployments broke lots of tools.
//
// The v1 Deployment fixed this problem by making Selector mandatory.
// But for old versions of Deployment, we need to auto-infer the selector
// before we add labels to the pod.
func allowLabelChangesInAppsDeploymentBeta1(dep *appsv1beta1.Deployment) {
selector := dep.Spec.Selector
if selector != nil &&
(len(selector.MatchLabels) > 0 || len(selector.MatchExpressions) > 0) {
return
}
podSpecLabels := dep.Spec.Template.Labels
matchLabels := make(map[string]string, len(podSpecLabels))
for k, v := range podSpecLabels {
matchLabels[k] = v
}
if dep.Spec.Selector == nil {
dep.Spec.Selector = &metav1.LabelSelector{}
}
dep.Spec.Selector.MatchLabels = matchLabels
}
// see notes on allowLabelChangesInAppsDeploymentBeta1
func allowLabelChangesInAppsDeploymentBeta2(dep *appsv1beta2.Deployment) {
selector := dep.Spec.Selector
if selector != nil &&
(len(selector.MatchLabels) > 0 || len(selector.MatchExpressions) > 0) {
return
}
podSpecLabels := dep.Spec.Template.Labels
matchLabels := make(map[string]string, len(podSpecLabels))
for k, v := range podSpecLabels {
matchLabels[k] = v
}
if dep.Spec.Selector == nil {
dep.Spec.Selector = &metav1.LabelSelector{}
}
dep.Spec.Selector.MatchLabels = matchLabels
}
func allowLabelChangesInExtDeploymentBeta1(dep *extv1beta1.Deployment) {
selector := dep.Spec.Selector
if selector != nil &&
(len(selector.MatchLabels) > 0 || len(selector.MatchExpressions) > 0) {
return
}
podSpecLabels := dep.Spec.Template.Labels
matchLabels := make(map[string]string, len(podSpecLabels))
for k, v := range podSpecLabels {
matchLabels[k] = v
}
if dep.Spec.Selector == nil {
dep.Spec.Selector = &metav1.LabelSelector{}
}
dep.Spec.Selector.MatchLabels = matchLabels
}
// SelectorMatchesLabels indicates whether the pod selector of the given entity matches the given label(s).
// Currently only supports Services, but may be expanded to support other types that
// match pods via selectors.
func (e K8sEntity) SelectorMatchesLabels(labels map[string]string) bool {
svc, ok := e.Obj.(*v1.Service)
if !ok {
return false
}
selector := svc.Spec.Selector
for k, selVal := range selector {
realVal, ok := labels[k]
if !ok || realVal != selVal {
return false
}
}
return true
}
// MatchesMetadataLabels indicates whether the given label(s) are a subset
// of metadata labels for the given entity.
func (e K8sEntity) MatchesMetadataLabels(labels map[string]string) (bool, error) {
// TODO(nick): This doesn't seem right.
// This should only look at the top-level obj meta, not all of them.
metas, err := extractObjectMetas(&e, NoFilter)
if err != nil {
return false, err
}
for _, meta := range metas {
for k, v := range labels {
realVal, ok := meta.Labels[k]
if !ok || realVal != v {
return false, nil
}
}
}
return true, nil
}