✨ introduce gRPC configuration (#383)

* introduce gRPC configuration

Signed-off-by: clyang82 <[email protected]>

* address review comments

Signed-off-by: clyang82 <[email protected]>

---------

Signed-off-by: clyang82 <[email protected]>

Author: clyang82

operator/v1/0000_01_operator.open-cluster-management.io_clustermanagers.crd.yaml

@@ -268,6 +268,7 @@ spec:
                           enum:
                           - csr
                           - awsirsa
+                          - grpc
                           type: string
                         awsirsa:
                           description: AwsIrsa represents the configuration for awsirsa
@@ -303,6 +304,46 @@ spec:
                                 type: string
                               type: array
                           type: object
+                        grpc:
+                          description: GRPC represents the configuration for gRPC
+                            driver.
+                          properties:
+                            autoApprovedIdentities:
+                              description: AutoApprovedIdentities represent a list
+                                of approved arn patterns
+                              items:
+                                type: string
+                              type: array
+                            endpointExposure:
+                              description: EndpointExposure represents the configuration
+                                for endpoint exposure.
+                              properties:
+                                hostname:
+                                  description: Hostname points to a fixed hostname
+                                    for serving agents' handshakes.
+                                  properties:
+                                    value:
+                                      type: string
+                                  required:
+                                  - value
+                                  type: object
+                                type:
+                                  default: hostname
+                                  description: |-
+                                    Type specifies how the gRPC endpoint is exposed.
+                                    You may need to apply an object to expose the gRPC endpoint, for example: a route.
+                                  enum:
+                                  - hostname
+                                  type: string
+                              required:
+                              - type
+                              type: object
+                            imagePullSpec:
+                              default: quay.io/open-cluster-management/registration
+                              description: ImagePullSpec represents the desired image
+                                of the gRPC broker installed on hub.
+                              type: string
+                          type: object
                       required:
                       - authType
                       type: object

operator/v1/types_clustermanager.go

@@ -122,7 +122,7 @@ type RegistrationDriverHub struct {
 	// Type of the authentication used by hub to initialize the Hub cluster. Possible values are csr and awsirsa.
 	// +required
 	// +kubebuilder:default:=csr
-	// +kubebuilder:validation:Enum=csr;awsirsa
+	// +kubebuilder:validation:Enum=csr;awsirsa;grpc
 	AuthType string `json:"authType,omitempty"`
 
 	// CSR represents the configuration for csr driver.
@@ -132,8 +132,56 @@ type RegistrationDriverHub struct {
 	// AwsIrsa represents the configuration for awsirsa driver.
 	// +optional
 	AwsIrsa *AwsIrsaConfig `json:"awsirsa,omitempty"`
+
+	// GRPC represents the configuration for gRPC driver.
+	// +optional
+	GRPC *GRPCConfig `json:"grpc,omitempty"`
+}
+
+// GRPC represents the configuration for gRPC driver.
+type GRPCConfig struct {
+	// ImagePullSpec represents the desired image of the gRPC broker installed on hub.
+	// +optional
+	// +kubebuilder:default=quay.io/open-cluster-management/registration
+	ImagePullSpec string `json:"imagePullSpec,omitempty"`
+
+	// EndpointExposure represents the configuration for endpoint exposure.
+	// +optional
+	EndpointExposure *GRPCEndpointExposure `json:"endpointExposure,omitempty"`
+
+	// AutoApprovedIdentities represent a list of approved arn patterns
+	// +optional
+	AutoApprovedIdentities []string `json:"autoApprovedIdentities,omitempty"`
 }
 
+type GRPCEndpointExposure struct {
+	// Type specifies how the gRPC endpoint is exposed.
+	// You may need to apply an object to expose the gRPC endpoint, for example: a route.
+	// TODO: support loadbalancer.
+	// +kubebuilder:default:=hostname
+	// +kubebuilder:validation:Enum=hostname
+	// +required
+	Type GRPCEndpointExposureType `json:"type,omitempty"`
+
+	// Hostname points to a fixed hostname for serving agents' handshakes.
+	// +optional
+	Hostname *HostnameConfig `json:"hostname,omitempty"`
+}
+
+// HostnameConfig references a fixed hostname.
+type HostnameConfig struct {
+	// +required
+	Value string `json:"value"`
+}
+
+// GRPCEndpointExposureType represents the type of endpoint exposure for gRPC.
+type GRPCEndpointExposureType string
+
+const (
+	// GRPCEndpointTypeHostname is the gRPC endpoint exposure type for hostname.
+	GRPCEndpointTypeHostname GRPCEndpointExposureType = "hostname"
+)
+
 type CSRConfig struct {
 	// AutoApprovedIdentities represent a list of approved users
 	// +optional