Add node affinity, pod affinity and pod antiaffinity validation for alpha annotations.

pkg/api/helpers.go

@@ -18,6 +18,7 @@ package api
 
 import (
 	"crypto/md5"
+	"encoding/json"
 	"fmt"
 	"reflect"
 	"strings"
@@ -463,6 +464,11 @@ const (
 	// an object (e.g. secret, config map) before fetching it again from apiserver.
 	// This annotation can be attached to node.
 	ObjectTTLAnnotationKey string = "node.alpha.kubernetes.io/ttl"
+
+	// AffinityAnnotationKey represents the key of affinity data (json serialized)
+	// in the Annotations of a Pod.
+	// TODO: remove when alpha support for affinity is removed
+	AffinityAnnotationKey string = "scheduler.alpha.kubernetes.io/affinity"
 )
 
 // AddOrUpdateTolerationInPod tries to add a toleration to the pod's toleration list.
@@ -596,6 +602,21 @@ func PodAnnotationsFromSysctls(sysctls []Sysctl) string {
 	return strings.Join(kvs, ",")
 }
 
+// GetAffinityFromPodAnnotations gets the json serialized affinity data from Pod.Annotations
+// and converts it to the Affinity type in api.
+// TODO: remove when alpha support for affinity is removed
+func GetAffinityFromPodAnnotations(annotations map[string]string) (*Affinity, error) {
+	if len(annotations) > 0 && annotations[AffinityAnnotationKey] != "" {
+		var affinity Affinity
+		err := json.Unmarshal([]byte(annotations[AffinityAnnotationKey]), &affinity)
+		if err != nil {
+			return nil, err
+		}
+		return &affinity, nil
+	}
+	return nil, nil
+}
+
 // GetPersistentVolumeClass returns StorageClassName.
 func GetPersistentVolumeClass(volume *PersistentVolume) string {
 	// Use beta annotation first

pkg/api/validation/validation.go

@@ -105,6 +105,10 @@ func ValidateDNS1123Subdomain(value string, fldPath *field.Path) field.ErrorList
 func ValidatePodSpecificAnnotations(annotations map[string]string, spec *api.PodSpec, fldPath *field.Path) field.ErrorList {
 	allErrs := field.ErrorList{}
 
+	if annotations[api.AffinityAnnotationKey] != "" {
+		allErrs = append(allErrs, ValidateAffinityInPodAnnotations(annotations, fldPath)...)
+	}
+
 	// TODO: remove these after we EOL the annotations.
 	if hostname, exists := annotations[utilpod.PodHostnameAnnotation]; exists {
 		allErrs = append(allErrs, ValidateDNS1123Label(hostname, fldPath.Key(utilpod.PodHostnameAnnotation))...)
@@ -136,6 +140,23 @@ func ValidatePodSpecificAnnotations(annotations map[string]string, spec *api.Pod
 	return allErrs
 }
 
+// ValidateAffinityInPodAnnotations tests that the serialized Affinity in Pod.Annotations has valid data
+func ValidateAffinityInPodAnnotations(annotations map[string]string, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+
+	affinity, err := api.GetAffinityFromPodAnnotations(annotations)
+	if err != nil {
+		allErrs = append(allErrs, field.Invalid(fldPath, api.AffinityAnnotationKey, err.Error()))
+		return allErrs
+	}
+	if affinity == nil {
+		return allErrs
+	}
+
+	allErrs = append(allErrs, validateAffinity(affinity, fldPath.Child("affinity"))...)
+	return allErrs
+}
+
 func ValidatePodSpecificAnnotationUpdates(newPod, oldPod *api.Pod, fldPath *field.Path) field.ErrorList {
 	allErrs := field.ErrorList{}
 	newAnnotations := newPod.Annotations