options: fix interceptors, add defaulter and recovery

README.md

@@ -9,7 +9,7 @@ Principles:
 
 Features:
 - [x] simple configuration with options
-- [x] embeded gorm database with options (branch db)
+- [x] embedded gorm database with options (branch db)
 - [x] simple TLS configuration
 - [ ] TLS auth
 - [ ] client connection pool
@@ -17,20 +17,22 @@ Features:
     - [ ] mdns
     - [ ] kubernetes
 - [ ] default interceptors implementation:
-    - [ ] default
-    - [ ] validation
+    - [ ] context request id
+    - [x] defaulter
+    - [x] validation
     - [ ] health
     - [ ] context logger
     - [ ] sentry
     - [ ] rate-limiting
+    - [ ] ban
     - [ ] auth claim in context
-    - [ ] recovery
+    - [x] recovery (server side only)
     - [x] tracing (open-tracing)
     - [x] metrics (prometheus)
     - [ ] retries
     - [ ] context DB / transaction
     - ...
-- [ ] api gateway with middleware:
+- [ ] grpc web / api gateway with middleware:
     - [ ] auth
     - [ ] cors
     - [ ] logging
@@ -43,3 +45,5 @@ Features:
 - https://github.com/grpc-ecosystem/grpc-opentracing
 - https://github.com/grpc-ecosystem/go-grpc-prometheus
 - https://github.com/grpc-ecosystem/grpc-gateway
+- https://github.com/jaredfolkins/badactor
+- github.com/improbable-eng/grpc-web

example/example.go

@@ -14,6 +14,7 @@ import (
 	"github.com/sirupsen/logrus"
 
 	"go.linka.cloud/grpc/client"
+	"go.linka.cloud/grpc/interceptors/defaulter"
 	metrics2 "go.linka.cloud/grpc/interceptors/metrics"
 	validation2 "go.linka.cloud/grpc/interceptors/validation"
 	"go.linka.cloud/grpc/logger"
@@ -69,6 +70,7 @@ func main() {
 	var err error
 	metrics := metrics2.NewInterceptors()
 	validation := validation2.NewInterceptors(true)
+	defaulter := defaulter.NewInterceptors()
 	address := "0.0.0.0:9991"
 	svc, err = service.New(
 		service.WithContext(ctx),
@@ -93,7 +95,7 @@ func main() {
 		service.WithGRPCWeb(true),
 		service.WithGRPCWebPrefix("/grpc"),
 		service.WithMiddlewares(httpLogger),
-		service.WithInterceptors(validation, metrics),
+		service.WithInterceptors(metrics, defaulter, validation),
 	)
 	if err != nil {
 		panic(err)
@@ -125,7 +127,7 @@ func main() {
 	if err == nil {
 		logrus.Fatal("expected validation error")
 	}
-	stream, err := g.SayHelloStream(context.Background(), &HelloStreamRequest{Name: "test", Count: 10})
+	stream, err := g.SayHelloStream(context.Background(), &HelloStreamRequest{Name: "test"})
 	if err != nil {
 		logrus.Fatal(err)
 	}

example/example.pb.defaults.go

@@ -21,4 +21,7 @@ func (x *HelloReply) Default() {
 }
 
 func (x *HelloStreamRequest) Default() {
+	if x.Count == 0 {
+		x.Count = 10
+	}
 }

example/example.pb.go

@@ -11,6 +11,7 @@ import (
 	sync "sync"
 
 	_ "github.com/envoyproxy/protoc-gen-validate/validate"
+	_ "go.linka.cloud/protoc-gen-defaults/defaults"
 	_ "google.golang.org/genproto/googleapis/api/annotations"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
@@ -180,32 +181,34 @@ var file_example_example_proto_rawDesc = []byte{
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+	0x61, 0x69, 0x6e, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

example/example.pb.validate.go

@@ -249,7 +249,16 @@ func (m *HelloStreamRequest) Validate(all bool) error {
 		errors = append(errors, err)
 	}
 
-	// no validation rules for Count
+	if val := m.GetCount(); val < 1 || val > 10 {
+		err := HelloStreamRequestValidationError{
+			field:  "Count",
+			reason: "value must be inside range [1, 10]",
+		}
+		if !all {
+			return err
+		}
+		errors = append(errors, err)
+	}
 
 	if len(errors) > 0 {
 		return HelloStreamRequestMultiError(errors)

example/example.proto

@@ -6,6 +6,7 @@ option go_package = "go.linka.cloud/grpc/example;main";
 
 import "google/api/annotations.proto";
 import "validate/validate.proto";
+import "defaults/defaults.proto";
 
 service Greeter {
     rpc SayHello (HelloRequest) returns (HelloReply) {
@@ -27,5 +28,5 @@ message HelloReply {
 
 message HelloStreamRequest {
     string name = 1 [(validate.rules).string = {min_len: 2, max_len: 40}];
-    int64 count = 2;
+    int64 count = 2 [(validate.rules).int64 = {gte: 1, lte: 10}, (defaults.value).int64 = 10];
 }

interceptors/defaulter/interceptors.go

@@ -0,0 +1,77 @@
+package defaulter
+
+import (
+	"context"
+
+	"google.golang.org/grpc"
+
+	"go.linka.cloud/grpc/interceptors"
+)
+
+type interceptor struct{}
+
+func NewInterceptors() interceptors.Interceptors {
+	return &interceptor{}
+}
+
+func defaults(v interface{}) {
+	if d, ok := v.(interface{ Default() }); v != nil && ok {
+		d.Default()
+	}
+}
+
+func (i interceptor) UnaryServerInterceptor() grpc.UnaryServerInterceptor {
+	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
+		defaults(req)
+		return handler(ctx, req)
+	}
+}
+
+func (i interceptor) UnaryClientInterceptor() grpc.UnaryClientInterceptor {
+	return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
+		defaults(req)
+		return invoker(ctx, method, req, reply, cc, opts...)
+	}
+}
+
+func (i interceptor) StreamServerInterceptor() grpc.StreamServerInterceptor {
+	return func(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
+		wrapper := &recvWrapper{ServerStream: stream}
+		return handler(srv, wrapper)
+	}
+}
+
+func (i interceptor) StreamClientInterceptor() grpc.StreamClientInterceptor {
+	return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
+		desc.Handler = (&sendWrapper{handler: desc.Handler}).Handler()
+		return streamer(ctx, desc, cc, method)
+	}
+}
+
+type recvWrapper struct {
+	grpc.ServerStream
+}
+
+func (s *recvWrapper) RecvMsg(m interface{}) error {
+	if err := s.ServerStream.RecvMsg(m); err != nil {
+		return err
+	}
+	defaults(m)
+	return nil
+}
+
+type sendWrapper struct {
+	grpc.ServerStream
+	handler grpc.StreamHandler
+}
+
+func (s *sendWrapper) Handler() grpc.StreamHandler {
+	return func(srv interface{}, stream grpc.ServerStream) error {
+		return s.handler(srv, s)
+	}
+}
+
+func (s *sendWrapper) SendMsg(m interface{}) error {
+	defaults(m)
+	return s.ServerStream.SendMsg(m)
+}

interceptors/recovery/interceptors.go

@@ -0,0 +1,29 @@
+package recovery
+
+import (
+	grpc_recovery "github.com/grpc-ecosystem/go-grpc-middleware/recovery"
+	"google.golang.org/grpc"
+)
+
+type interceptors struct {
+	opts grpc_recovery.Option
+}
+
+func (i *interceptors) UnaryServerInterceptor() grpc.UnaryServerInterceptor {
+	return grpc_recovery.UnaryServerInterceptor(i.opts)
+}
+
+func (i *interceptors) StreamServerInterceptor() grpc.StreamServerInterceptor {
+	return grpc_recovery.StreamServerInterceptor(i.opts)
+}
+
+func (i *interceptors) UnaryClientInterceptor() grpc.UnaryClientInterceptor {
+	panic("not implemented")
+}
+
+func (i *interceptors) StreamClientInterceptor() grpc.StreamClientInterceptor {
+	panic("not implemented")
+}
+
+
+

interceptors/validation/validation.go

@@ -133,11 +133,9 @@ func (s *recvWrapper) RecvMsg(m interface{}) error {
 	if err := s.ServerStream.RecvMsg(m); err != nil {
 		return err
 	}
-
 	if err := s.i.validate(m); err != nil {
 		return err
 	}
-
 	return nil
 }
 

service/options.go

@@ -370,7 +370,6 @@ type options struct {
 
 	serverOpts []grpc.ServerOption
 
-
 	unaryServerInterceptors  []grpc.UnaryServerInterceptor
 	streamServerInterceptors []grpc.StreamServerInterceptor
 

service/service.go

@@ -110,7 +110,7 @@ func newService(opts ...Option) (*service, error) {
 	ui := grpcmiddleware.ChainUnaryServer(s.opts.unaryServerInterceptors...)
 	s.inproc = s.inproc.WithServerUnaryInterceptor(ui)
 
-	si := grpcmiddleware.ChainStreamServer( /*TODO(adphi): add to options*/ )
+	si := grpcmiddleware.ChainStreamServer(s.opts.streamServerInterceptors... )
 	s.inproc = s.inproc.WithServerStreamInterceptor(si)
 
 	gopts := []grpc.ServerOption{