Add placement appi

Signed-off-by: Tamal Saha <tamal@appscode.com>

apis/apps/v1/placement_types.go

@@ -0,0 +1,99 @@
+/*
+Copyright AppsCode Inc. and Contributors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1
+
+import (
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// +genclient
+// +genclient:nonNamespaced
+// +genclient:skipVerbs=updateStatus
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+// +kubebuilder:resource:scope=Cluster
+
+// Placement represents a set of pods with consistent identities.
+// Identities are defined as:
+//   - Network: A single stable DNS and hostname.
+//   - Storage: As many VolumeClaims as requested.
+//
+// The Placement guarantees that a given network identity will always
+// map to the same storage identity.
+type Placement struct {
+	metav1.TypeMeta `json:",inline"`
+	// Standard object's metadata.
+	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
+	// +optional
+	metav1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
+
+	// Spec defines the desired identities of pods in this set.
+	// +optional
+	Spec PlacementSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`
+}
+
+// A PlacementSpec is the specification of a Placement.
+type PlacementSpec struct {
+	// +optional
+	SpreadAcrossZones *SpreadAcrossZones `json:"spreadAcrossZones,omitempty"`
+
+	// +optional
+	SpreadAcrossNodes *SpreadAcrossNodes `json:"spreadAcrossNodes,omitempty"`
+
+	// +optional
+	NodeAffinity []NodeAffinityRules `json:"nodeAffinity,omitempty"`
+}
+
+type SpreadAcrossZones struct {
+	Zones             []string                         `json:"zones"`
+	MaxSkew           int32                            `json:"maxSkew"`
+	WhenUnsatisfiable v1.UnsatisfiableConstraintAction `json:"whenUnsatisfiable"`
+}
+
+type SpreadAcrossNodes struct {
+	MaxSkew           int32                            `json:"maxSkew"`
+	WhenUnsatisfiable v1.UnsatisfiableConstraintAction `json:"whenUnsatisfiable"`
+}
+
+type NodeAffinityRules struct {
+	TopologyKey       string                           `json:"topologyKey"`
+	Domains           []TopologyDomain                 `json:"domains"`
+	WhenUnsatisfiable v1.UnsatisfiableConstraintAction `json:"whenUnsatisfiable"`
+}
+
+type TopologyDomain struct {
+	Domain   string `json:"domain"`
+	Replicas string `json:"replicas"`
+}
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+
+// PlacementList is a collection of Placements.
+type PlacementList struct {
+	metav1.TypeMeta `json:",inline"`
+	// Standard list's metadata.
+	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
+	// +optional
+	metav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
+
+	// Items is the list of stateful sets.
+	Items []Placement `json:"items" protobuf:"bytes,2,rep,name=items"`
+}
+
+func init() {
+	SchemeBuilder.Register(&Placement{}, &PlacementList{})
+}

apis/apps/v1/statefulset_types.go

@@ -27,6 +27,8 @@ import (
 // +genclient:method=UpdateScale,verb=update,subresource=scale,input=k8s.io/api/autoscaling/v1.Scale,result=k8s.io/api/autoscaling/v1.Scale
 // +genclient:method=ApplyScale,verb=apply,subresource=scale,input=k8s.io/api/autoscaling/v1.Scale,result=k8s.io/api/autoscaling/v1.Scale
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+// +kubebuilder:subresource:status
+// +kubebuilder:subresource:scale:specpath=.spec.replicas,statuspath=.status.replicas
 
 // StatefulSet represents a set of pods with consistent identities.
 // Identities are defined as:
@@ -138,6 +140,9 @@ type StatefulSetSpec struct {
 	// enabled, which is beta.
 	// +optional
 	Ordinals *apps.StatefulSetOrdinals `json:"ordinals,omitempty" protobuf:"bytes,11,opt,name=ordinals"`
+
+	// +optional
+	PodPlacementPolicy *v1.LocalObjectReference `json:"podPlacementPolicy,omitempty"`
 }
 
 // PodTemplateSpec describes the data a pod should have when created from a template