cephfs: add CSI-Addons support to the cephfs

this commit adds CSI-Addons support to the
cephfs provisioner

Signed-off-by: riya-singhal31 <rsinghal@redhat.com>

internal/csi-addons/cephfs/identity.go

@@ -0,0 +1,102 @@
+/*
+Copyright 2023 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 cephfs
+
+import (
+	"context"
+
+	"github.com/csi-addons/spec/lib/go/identity"
+	"google.golang.org/grpc"
+	"google.golang.org/protobuf/types/known/wrapperspb"
+
+	"github.com/ceph/ceph-csi/internal/util"
+)
+
+// IdentityServer struct of ceph CSI driver with supported methods of CSI
+// identity server spec.
+type IdentityServer struct {
+	*identity.UnimplementedIdentityServer
+
+	config *util.Config
+}
+
+// NewIdentityServer creates a new IdentityServer which handles the Identity
+// Service requests from the CSI-Addons specification.
+func NewIdentityServer(config *util.Config) *IdentityServer {
+	return &IdentityServer{
+		config: config,
+	}
+}
+
+func (is *IdentityServer) RegisterService(server grpc.ServiceRegistrar) {
+	identity.RegisterIdentityServer(server, is)
+}
+
+// GetIdentity returns available capabilities of the ceph driver.
+func (is *IdentityServer) GetIdentity(
+	ctx context.Context,
+	req *identity.GetIdentityRequest,
+) (*identity.GetIdentityResponse, error) {
+	// only include Name and VendorVersion, Manifest is optional
+	res := &identity.GetIdentityResponse{
+		Name:          is.config.DriverName,
+		VendorVersion: util.DriverVersion,
+	}
+
+	return res, nil
+}
+
+// GetCapabilities returns available capabilities of the ceph driver.
+func (is *IdentityServer) GetCapabilities(
+	ctx context.Context,
+	req *identity.GetCapabilitiesRequest,
+) (*identity.GetCapabilitiesResponse, error) {
+	// build the list of capabilities, depending on the config
+	caps := make([]*identity.Capability, 0)
+
+	if is.config.IsControllerServer {
+		// we're running as a CSI Controller service
+		caps = append(caps,
+			&identity.Capability{
+				Type: &identity.Capability_Service_{
+					Service: &identity.Capability_Service{
+						Type: identity.Capability_Service_CONTROLLER_SERVICE,
+					},
+				},
+			})
+	}
+
+	res := &identity.GetCapabilitiesResponse{
+		Capabilities: caps,
+	}
+
+	return res, nil
+}
+
+// Probe is called by the CO plugin to validate that the CSI-Addons Node is
+// still healthy.
+func (is *IdentityServer) Probe(
+	ctx context.Context,
+	req *identity.ProbeRequest,
+) (*identity.ProbeResponse, error) {
+	// there is nothing that would cause a delay in getting ready
+	res := &identity.ProbeResponse{
+		Ready: &wrapperspb.BoolValue{Value: true},
+	}
+
+	return res, nil
+}