add MultiClusterService API

Signed-off-by: changzhen <changzhen5@huawei.com>

charts/karmada/_crds/bases/networking.karmada.io_multiclusterservices.yaml

@@ -0,0 +1,234 @@
+---
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  annotations:
+    controller-gen.kubebuilder.io/version: v0.8.0
+  creationTimestamp: null
+  name: multiclusterservices.networking.karmada.io
+spec:
+  group: networking.karmada.io
+  names:
+    categories:
+    - karmada-io
+    kind: MultiClusterService
+    listKind: MultiClusterServiceList
+    plural: multiclusterservices
+    shortNames:
+    - mcs
+    singular: multiclusterservice
+  scope: Namespaced
+  versions:
+  - name: v1alpha1
+    schema:
+      openAPIV3Schema:
+        description: MultiClusterService is a named abstraction of multi-cluster software
+          service. The name field of MultiClusterService is the same as that of Service
+          name. Services with the same name in different clusters are regarded as
+          the same service and are associated with the same MultiClusterService. MultiClusterService
+          can control the exposure of services to outside multiple clusters, and also
+          enable service discovery between clusters.
+        properties:
+          apiVersion:
+            description: 'APIVersion defines the versioned schema of this representation
+              of an object. Servers should convert recognized schemas to the latest
+              internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources'
+            type: string
+          kind:
+            description: 'Kind is a string value representing the REST resource this
+              object represents. Servers may infer this from the endpoint the client
+              submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds'
+            type: string
+          metadata:
+            type: object
+          spec:
+            description: Spec is the desired state of the MultiClusterService.
+            properties:
+              ports:
+                description: Ports is the list of ports that are exposed by this MultiClusterService.
+                  No specified port will be filtered out during the service exposure
+                  and discovery process. All ports in the referencing service will
+                  be exposed by default.
+                items:
+                  description: ExposurePort describes which port will be exposed.
+                  properties:
+                    name:
+                      description: Name is the name of the port that needs to be exposed
+                        within the service. The port name must be the same as that
+                        defined in the service.
+                      type: string
+                    port:
+                      description: Port specifies the exposed service port.
+                      format: int32
+                      type: integer
+                  type: object
+                type: array
+              range:
+                description: Range specifies the ranges where the referencing service
+                  should be exposed. Only valid and optional in case of Types contains
+                  CrossCluster. If not set and Types contains CrossCluster, all clusters
+                  will be selected, that means the referencing service will be exposed
+                  across all registered clusters.
+                properties:
+                  clusterNames:
+                    description: ClusterNames is the list of clusters to be selected.
+                    items:
+                      type: string
+                    type: array
+                type: object
+              types:
+                description: Types specifies how to expose the service referencing
+                  by this MultiClusterService.
+                items:
+                  description: ExposureType describes how to expose the service.
+                  type: string
+                type: array
+            required:
+            - types
+            type: object
+          status:
+            description: Status is the current state of the MultiClusterService.
+            properties:
+              conditions:
+                description: Current service state
+                items:
+                  description: "Condition contains details for one aspect of the current
+                    state of this API Resource. --- This struct is intended for direct
+                    use as an array at the field path .status.conditions.  For example,
+                    \n type FooStatus struct{ // Represents the observations of a
+                    foo's current state. // Known .status.conditions.type are: \"Available\",
+                    \"Progressing\", and \"Degraded\" // +patchMergeKey=type // +patchStrategy=merge
+                    // +listType=map // +listMapKey=type Conditions []metav1.Condition
+                    `json:\"conditions,omitempty\" patchStrategy:\"merge\" patchMergeKey:\"type\"
+                    protobuf:\"bytes,1,rep,name=conditions\"` \n // other fields }"
+                  properties:
+                    lastTransitionTime:
+                      description: lastTransitionTime is the last time the condition
+                        transitioned from one status to another. This should be when
+                        the underlying condition changed.  If that is not known, then
+                        using the time when the API field changed is acceptable.
+                      format: date-time
+                      type: string
+                    message:
+                      description: message is a human readable message indicating
+                        details about the transition. This may be an empty string.
+                      maxLength: 32768
+                      type: string
+                    observedGeneration:
+                      description: observedGeneration represents the .metadata.generation
+                        that the condition was set based upon. For instance, if .metadata.generation
+                        is currently 12, but the .status.conditions[x].observedGeneration
+                        is 9, the condition is out of date with respect to the current
+                        state of the instance.
+                      format: int64
+                      minimum: 0
+                      type: integer
+                    reason:
+                      description: reason contains a programmatic identifier indicating
+                        the reason for the condition's last transition. Producers
+                        of specific condition types may define expected values and
+                        meanings for this field, and whether the values are considered
+                        a guaranteed API. The value should be a CamelCase string.
+                        This field may not be empty.
+                      maxLength: 1024
+                      minLength: 1
+                      pattern: ^[A-Za-z]([A-Za-z0-9_,:]*[A-Za-z0-9_])?$
+                      type: string
+                    status:
+                      description: status of the condition, one of True, False, Unknown.
+                      enum:
+                      - "True"
+                      - "False"
+                      - Unknown
+                      type: string
+                    type:
+                      description: type of condition in CamelCase or in foo.example.com/CamelCase.
+                        --- Many .condition.type values are consistent across resources
+                        like Available, but because arbitrary conditions can be useful
+                        (see .node.status.conditions), the ability to deconflict is
+                        important. The regex it matches is (dns1123SubdomainFmt/)?(qualifiedNameFmt)
+                      maxLength: 316
+                      pattern: ^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])$
+                      type: string
+                  required:
+                  - lastTransitionTime
+                  - message
+                  - reason
+                  - status
+                  - type
+                  type: object
+                type: array
+                x-kubernetes-list-map-keys:
+                - type
+                x-kubernetes-list-type: map
+              loadBalancer:
+                description: LoadBalancer contains the current status of the load-balancer,
+                  if one is present.
+                properties:
+                  ingress:
+                    description: Ingress is a list containing ingress points for the
+                      load-balancer. Traffic intended for the service should be sent
+                      to these ingress points.
+                    items:
+                      description: 'LoadBalancerIngress represents the status of a
+                        load-balancer ingress point: traffic intended for the service
+                        should be sent to an ingress point.'
+                      properties:
+                        hostname:
+                          description: Hostname is set for load-balancer ingress points
+                            that are DNS based (typically AWS load-balancers)
+                          type: string
+                        ip:
+                          description: IP is set for load-balancer ingress points
+                            that are IP based (typically GCE or OpenStack load-balancers)
+                          type: string
+                        ports:
+                          description: Ports is a list of records of service ports
+                            If used, every port defined in the service should have
+                            an entry in it
+                          items:
+                            properties:
+                              error:
+                                description: 'Error is to record the problem with
+                                  the service port The format of the error shall comply
+                                  with the following rules: - built-in error values
+                                  shall be specified in this file and those shall
+                                  use CamelCase names - cloud provider specific error
+                                  values must have names that comply with the format
+                                  foo.example.com/CamelCase. --- The regex it matches
+                                  is (dns1123SubdomainFmt/)?(qualifiedNameFmt)'
+                                maxLength: 316
+                                pattern: ^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])$
+                                type: string
+                              port:
+                                description: Port is the port number of the service
+                                  port of which status is recorded here
+                                format: int32
+                                type: integer
+                              protocol:
+                                default: TCP
+                                description: 'Protocol is the protocol of the service
+                                  port of which status is recorded here The supported
+                                  values are: "TCP", "UDP", "SCTP"'
+                                type: string
+                            required:
+                            - port
+                            - protocol
+                            type: object
+                          type: array
+                          x-kubernetes-list-type: atomic
+                      type: object
+                    type: array
+                type: object
+            type: object
+        type: object
+    served: true
+    storage: true
+    subresources:
+      status: {}
+status:
+  acceptedNames:
+    kind: ""
+    plural: ""
+  conditions: []
+  storedVersions: []

charts/karmada/_crds/kustomization.yaml

@@ -12,6 +12,7 @@ resources:
 - bases/config.karmada.io_resourceinterpretercustomizations.yaml
 - bases/config.karmada.io_resourceinterpreterwebhookconfigurations.yaml
 - bases/networking.karmada.io_multiclusteringresses.yaml
+- bases/networking.karmada.io_multiclusterservices.yaml
 - bases/autoscaling.karmada.io_federatedhpas.yaml
 
 patchesStrategicMerge:

pkg/apis/networking/v1alpha1/service_types.go

@@ -0,0 +1,97 @@
+package v1alpha1
+
+import (
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// +genclient
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+// +kubebuilder:subresource:status
+// +kubebuilder:resource:shortName=mcs,categories={karmada-io}
+
+// MultiClusterService is a named abstraction of multi-cluster software service.
+// The name field of MultiClusterService is the same as that of Service name.
+// Services with the same name in different clusters are regarded as the same
+// service and are associated with the same MultiClusterService.
+// MultiClusterService can control the exposure of services to outside multiple
+// clusters, and also enable service discovery between clusters.
+type MultiClusterService struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	// Spec is the desired state of the MultiClusterService.
+	Spec MultiClusterServiceSpec `json:"spec,omitempty"`
+
+	// Status is the current state of the MultiClusterService.
+	// +optional
+	Status corev1.ServiceStatus `json:"status,omitempty"`
+}
+
+// MultiClusterServiceSpec is the desired state of the MultiClusterService.
+type MultiClusterServiceSpec struct {
+	// Types specifies how to expose the service referencing by this
+	// MultiClusterService.
+	// +required
+	Types []ExposureType `json:"types"`
+
+	// Ports is the list of ports that are exposed by this MultiClusterService.
+	// No specified port will be filtered out during the service
+	// exposure and discovery process.
+	// All ports in the referencing service will be exposed by default.
+	// +optional
+	Ports []ExposurePort `json:"ports,omitempty"`
+
+	// Range specifies the ranges where the referencing service should
+	// be exposed.
+	// Only valid and optional in case of Types contains CrossCluster.
+	// If not set and Types contains CrossCluster, all clusters will
+	// be selected, that means the referencing service will be exposed
+	// across all registered clusters.
+	// +optional
+	Range ExposureRange `json:"range,omitempty"`
+}
+
+// ExposureType describes how to expose the service.
+type ExposureType string
+
+const (
+	// ExposureTypeCrossCluster means a service will be accessible across clusters.
+	ExposureTypeCrossCluster ExposureType = "CrossCluster"
+
+	// ExposureTypeLoadBalancer means a service will be exposed via an external
+	// load balancer.
+	ExposureTypeLoadBalancer ExposureType = "LoadBalancer"
+)
+
+// ExposurePort describes which port will be exposed.
+type ExposurePort struct {
+	// Name is the name of the port that needs to be exposed within the service.
+	// The port name must be the same as that defined in the service.
+	// +optional
+	Name string `json:"name,omitempty"`
+
+	// Port specifies the exposed service port.
+	// +optional
+	Port int32 `json:"port,omitempty"`
+}
+
+// ExposureRange describes a list of clusters where the service is exposed.
+// Now supports selecting cluster by name, leave the room for extend more methods
+// such as using label selector.
+type ExposureRange struct {
+	// ClusterNames is the list of clusters to be selected.
+	// +optional
+	ClusterNames []string `json:"clusterNames,omitempty"`
+}
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+
+// MultiClusterServiceList is a collection of MultiClusterService.
+type MultiClusterServiceList struct {
+	metav1.TypeMeta `json:",inline"`
+	metav1.ListMeta `json:"metadata,omitempty"`
+
+	// Items is the list of MultiClusterService.
+	Items []MultiClusterService `json:"items"`
+}