rbd: add framework for CSI-Addons Identity Service

Add a new CSI-Addons Server and empty Identity Service for the RBD
plugin. The implementation of the Identity Service procedure calls will
be done in other PRs.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

internal/csi-addons/rbd/identity.go

@@ -0,0 +1,55 @@
+/*
+Copyright 2021 The Ceph-CSI Authors.
+
+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 rbd
+
+import (
+	"context"
+
+	"github.com/csi-addons/spec/lib/go/identity"
+	"google.golang.org/grpc"
+)
+
+// IdentityServer struct of rbd CSI driver with supported methods of CSI
+// identity server spec.
+type IdentityServer struct {
+	*identity.UnimplementedIdentityServer
+}
+
+func (is *IdentityServer) RegisterService(server grpc.ServiceRegistrar) {
+	identity.RegisterIdentityServer(server, is)
+}
+
+// GetIdentity returns available capabilities of the rbd driver.
+func (is *IdentityServer) GetIdentity(
+	ctx context.Context,
+	req *identity.GetIdentityRequest) (*identity.GetIdentityResponse, error) {
+	return nil, nil
+}
+
+// GetCapabilities returns available capabilities of the rbd driver.
+func (is *IdentityServer) GetCapabilities(
+	ctx context.Context,
+	req *identity.GetCapabilitiesRequest) (*identity.GetCapabilitiesResponse, error) {
+	return nil, nil
+}
+
+// GetCapabilities returns available capabilities of the rbd driver.
+func (is *IdentityServer) Probe(
+	ctx context.Context,
+	req *identity.ProbeRequest) (*identity.ProbeResponse, error) {
+	return nil, nil
+}