[#1184] node: Add audit middleware for grpc services

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/services/session/audit.go

@@ -0,0 +1,39 @@
+package session
+
+import (
+	"context"
+	"sync/atomic"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
+	sessionGRPC "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session/grpc"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/audit"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
+)
+
+var _ Server = (*auditService)(nil)
+
+type auditService struct {
+	next    Server
+	log     *logger.Logger
+	enabled *atomic.Bool
+}
+
+func NewAuditService(next Server, log *logger.Logger, enabled *atomic.Bool) Server {
+	return &auditService{
+		next:    next,
+		log:     log,
+		enabled: enabled,
+	}
+}
+
+// Create implements Server.
+func (a *auditService) Create(ctx context.Context, req *session.CreateRequest) (*session.CreateResponse, error) {
+	res, err := a.next.Create(ctx, req)
+	if !a.enabled.Load() {
+		return res, err
+	}
+	audit.LogRequest(a.log, sessionGRPC.SessionService_Create_FullMethodName, req,
+		audit.TargetFromRef(req.GetBody().GetOwnerID(), &user.ID{}), err == nil)
+	return res, err
+}