[#13] services: Refactor UnarySignService

Replace UnaryHandler from structure to method arguments in order to reuse
single instance for different service methods.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/services/accounting/sign.go

@@ -10,21 +10,23 @@ import (
 
 type signService struct {
 	unarySigService *util.UnarySignService
+
+	svc accounting.Service
 }
 
 func NewSignService(key *ecdsa.PrivateKey, svc accounting.Service) accounting.Service {
 	return &signService{
-		unarySigService: util.NewUnarySignService(
-			key,
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.Balance(ctx, req.(*accounting.BalanceRequest))
-			},
-		),
+		unarySigService: util.NewUnarySignService(key),
+		svc:             svc,
 	}
 }
 
 func (s *signService) Balance(ctx context.Context, req *accounting.BalanceRequest) (*accounting.BalanceResponse, error) {
-	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req)
+	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.Balance(ctx, req.(*accounting.BalanceRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}

pkg/services/container/sign.go

@@ -9,57 +9,24 @@ import (
 )
 
 type signService struct {
-	putSigService     *util.UnarySignService
-	getSigService     *util.UnarySignService
-	delSigService     *util.UnarySignService
-	listSigService    *util.UnarySignService
-	setEACLSigService *util.UnarySignService
-	getEACLSigService *util.UnarySignService
+	unarySigService *util.UnarySignService
+
+	svc container.Service
 }
 
 func NewSignService(key *ecdsa.PrivateKey, svc container.Service) container.Service {
 	return &signService{
-		putSigService: util.NewUnarySignService(
-			key,
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.Put(ctx, req.(*container.PutRequest))
-			},
-		),
-		getSigService: util.NewUnarySignService(
-			key,
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.Get(ctx, req.(*container.GetRequest))
-			},
-		),
-		delSigService: util.NewUnarySignService(
-			key,
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.Delete(ctx, req.(*container.DeleteRequest))
-			},
-		),
-		listSigService: util.NewUnarySignService(
-			key,
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.List(ctx, req.(*container.ListRequest))
-			},
-		),
-		setEACLSigService: util.NewUnarySignService(
-			key,
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.SetExtendedACL(ctx, req.(*container.SetExtendedACLRequest))
-			},
-		),
-		getEACLSigService: util.NewUnarySignService(
-			key,
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.GetExtendedACL(ctx, req.(*container.GetExtendedACLRequest))
-			},
-		),
+		unarySigService: util.NewUnarySignService(key),
+		svc:             svc,
 	}
 }
 
 func (s *signService) Put(ctx context.Context, req *container.PutRequest) (*container.PutResponse, error) {
-	resp, err := s.putSigService.HandleUnaryRequest(ctx, req)
+	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.Put(ctx, req.(*container.PutRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -68,7 +35,11 @@ func (s *signService) Put(ctx context.Context, req *container.PutRequest) (*cont
 }
 
 func (s *signService) Delete(ctx context.Context, req *container.DeleteRequest) (*container.DeleteResponse, error) {
-	resp, err := s.delSigService.HandleUnaryRequest(ctx, req)
+	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.Get(ctx, req.(*container.GetRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -77,7 +48,11 @@ func (s *signService) Delete(ctx context.Context, req *container.DeleteRequest)
 }
 
 func (s *signService) Get(ctx context.Context, req *container.GetRequest) (*container.GetResponse, error) {
-	resp, err := s.getSigService.HandleUnaryRequest(ctx, req)
+	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.Delete(ctx, req.(*container.DeleteRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -86,7 +61,11 @@ func (s *signService) Get(ctx context.Context, req *container.GetRequest) (*cont
 }
 
 func (s *signService) List(ctx context.Context, req *container.ListRequest) (*container.ListResponse, error) {
-	resp, err := s.listSigService.HandleUnaryRequest(ctx, req)
+	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.List(ctx, req.(*container.ListRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -95,7 +74,11 @@ func (s *signService) List(ctx context.Context, req *container.ListRequest) (*co
 }
 
 func (s *signService) SetExtendedACL(ctx context.Context, req *container.SetExtendedACLRequest) (*container.SetExtendedACLResponse, error) {
-	resp, err := s.setEACLSigService.HandleUnaryRequest(ctx, req)
+	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.SetExtendedACL(ctx, req.(*container.SetExtendedACLRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -104,7 +87,11 @@ func (s *signService) SetExtendedACL(ctx context.Context, req *container.SetExte
 }
 
 func (s *signService) GetExtendedACL(ctx context.Context, req *container.GetExtendedACLRequest) (*container.GetExtendedACLResponse, error) {
-	resp, err := s.getEACLSigService.HandleUnaryRequest(ctx, req)
+	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.GetExtendedACL(ctx, req.(*container.GetExtendedACLRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}

pkg/services/object/sign.go

@@ -13,13 +13,9 @@ import (
 type signService struct {
 	key *ecdsa.PrivateKey
 
-	searchSigService    *util.UnarySignService
-	getSigService       *util.UnarySignService
-	putService          object.Service
-	rangeSigService     *util.UnarySignService
-	headSigService      *util.UnarySignService
-	delSigService       *util.UnarySignService
-	rangeHashSigService *util.UnarySignService
+	unarySigService *util.UnarySignService
+
+	svc object.Service
 }
 
 type searchStreamSigner struct {
@@ -48,44 +44,9 @@ type getRangeStreamSigner struct {
 
 func NewSignService(key *ecdsa.PrivateKey, svc object.Service) object.Service {
 	return &signService{
-		key: key,
-		searchSigService: util.NewUnarySignService(
-			nil, // private key is not needed because service returns stream
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.Search(ctx, req.(*object.SearchRequest))
-			},
-		),
-		getSigService: util.NewUnarySignService(
-			nil, // private key is not needed because service returns stream
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.Get(ctx, req.(*object.GetRequest))
-			},
-		),
-		putService: svc,
-		rangeSigService: util.NewUnarySignService(
-			nil, // private key is not needed because service returns stream
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.GetRange(ctx, req.(*object.GetRangeRequest))
-			},
-		),
-		headSigService: util.NewUnarySignService(
-			key,
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.Head(ctx, req.(*object.HeadRequest))
-			},
-		),
-		delSigService: util.NewUnarySignService(
-			key,
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.Delete(ctx, req.(*object.DeleteRequest))
-			},
-		),
-		rangeHashSigService: util.NewUnarySignService(
-			key,
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.GetRangeHash(ctx, req.(*object.GetRangeHashRequest))
-			},
-		),
+		key:             key,
+		unarySigService: util.NewUnarySignService(key),
+		svc:             svc,
 	}
 }
 
@@ -103,7 +64,11 @@ func (s *getStreamSigner) Recv() (*object.GetResponse, error) {
 }
 
 func (s *signService) Get(ctx context.Context, req *object.GetRequest) (object.GetObjectStreamer, error) {
-	resp, err := s.getSigService.HandleServerStreamRequest(ctx, req)
+	resp, err := s.unarySigService.HandleServerStreamRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.Get(ctx, req.(*object.GetRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -136,7 +101,7 @@ func (s *putStreamSigner) CloseAndRecv() (*object.PutResponse, error) {
 }
 
 func (s *signService) Put(ctx context.Context) (object.PutObjectStreamer, error) {
-	stream, err := s.putService.Put(ctx)
+	stream, err := s.svc.Put(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not create Put object streamer")
 	}
@@ -148,7 +113,11 @@ func (s *signService) Put(ctx context.Context) (object.PutObjectStreamer, error)
 }
 
 func (s *signService) Head(ctx context.Context, req *object.HeadRequest) (*object.HeadResponse, error) {
-	resp, err := s.headSigService.HandleUnaryRequest(ctx, req)
+	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.Head(ctx, req.(*object.HeadRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -170,7 +139,11 @@ func (s *searchStreamSigner) Recv() (*object.SearchResponse, error) {
 }
 
 func (s *signService) Search(ctx context.Context, req *object.SearchRequest) (object.SearchObjectStreamer, error) {
-	resp, err := s.searchSigService.HandleServerStreamRequest(ctx, req)
+	resp, err := s.unarySigService.HandleServerStreamRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.Search(ctx, req.(*object.SearchRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -182,7 +155,11 @@ func (s *signService) Search(ctx context.Context, req *object.SearchRequest) (ob
 }
 
 func (s *signService) Delete(ctx context.Context, req *object.DeleteRequest) (*object.DeleteResponse, error) {
-	resp, err := s.delSigService.HandleUnaryRequest(ctx, req)
+	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.Delete(ctx, req.(*object.DeleteRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -204,7 +181,11 @@ func (s *getRangeStreamSigner) Recv() (*object.GetRangeResponse, error) {
 }
 
 func (s *signService) GetRange(ctx context.Context, req *object.GetRangeRequest) (object.GetRangeObjectStreamer, error) {
-	resp, err := s.rangeSigService.HandleServerStreamRequest(ctx, req)
+	resp, err := s.unarySigService.HandleServerStreamRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.GetRange(ctx, req.(*object.GetRangeRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -216,7 +197,11 @@ func (s *signService) GetRange(ctx context.Context, req *object.GetRangeRequest)
 }
 
 func (s *signService) GetRangeHash(ctx context.Context, req *object.GetRangeHashRequest) (*object.GetRangeHashResponse, error) {
-	resp, err := s.rangeHashSigService.HandleUnaryRequest(ctx, req)
+	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.GetRangeHash(ctx, req.(*object.GetRangeHashRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}

pkg/services/session/sign.go

@@ -10,21 +10,22 @@ import (
 
 type signService struct {
 	unarySigService *util.UnarySignService
+
+	svc session.Service
 }
 
 func NewSignService(key *ecdsa.PrivateKey, svc session.Service) session.Service {
 	return &signService{
-		unarySigService: util.NewUnarySignService(
-			key,
-			func(ctx context.Context, req interface{}) (interface{}, error) {
-				return svc.Create(ctx, req.(*session.CreateRequest))
-			},
-		),
+		unarySigService: util.NewUnarySignService(key),
 	}
 }
 
 func (s *signService) Create(ctx context.Context, req *session.CreateRequest) (*session.CreateResponse, error) {
-	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req)
+	resp, err := s.unarySigService.HandleUnaryRequest(ctx, req,
+		func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.svc.Create(ctx, req.(*session.CreateRequest))
+		},
+	)
 	if err != nil {
 		return nil, err
 	}

pkg/services/util/sign.go

@@ -12,24 +12,21 @@ type UnaryHandler func(context.Context, interface{}) (interface{}, error)
 
 type UnarySignService struct {
 	key *ecdsa.PrivateKey
-
-	unaryHandler UnaryHandler
 }
 
-func NewUnarySignService(key *ecdsa.PrivateKey, handler UnaryHandler) *UnarySignService {
+func NewUnarySignService(key *ecdsa.PrivateKey) *UnarySignService {
 	return &UnarySignService{
-		key:          key,
-		unaryHandler: handler,
+		key: key,
 	}
 }
 
-func (s *UnarySignService) HandleServerStreamRequest(ctx context.Context, req interface{}) (interface{}, error) {
-	return s.verifyAndProc(ctx, req)
+func (s *UnarySignService) HandleServerStreamRequest(ctx context.Context, req interface{}, handler UnaryHandler) (interface{}, error) {
+	return s.verifyAndProc(ctx, req, handler)
 }
 
-func (s *UnarySignService) HandleUnaryRequest(ctx context.Context, req interface{}) (interface{}, error) {
+func (s *UnarySignService) HandleUnaryRequest(ctx context.Context, req interface{}, handler UnaryHandler) (interface{}, error) {
 	// verify and process request
-	resp, err := s.verifyAndProc(ctx, req)
+	resp, err := s.verifyAndProc(ctx, req, handler)
 	if err != nil {
 		return nil, err
 	}
@@ -42,14 +39,14 @@ func (s *UnarySignService) HandleUnaryRequest(ctx context.Context, req interface
 	return resp, nil
 }
 
-func (s *UnarySignService) verifyAndProc(ctx context.Context, req interface{}) (interface{}, error) {
+func (s *UnarySignService) verifyAndProc(ctx context.Context, req interface{}, handler UnaryHandler) (interface{}, error) {
 	// verify request signatures
 	if err := signature.VerifyServiceMessage(req); err != nil {
 		return nil, errors.Wrap(err, "could not verify request")
 	}
 
 	// process request
-	resp, err := s.unaryHandler(ctx, req)
+	resp, err := handler(ctx, req)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not handle request")
 	}