fix: make RegisterMsgServiceDesc not use the global registry (#19835)

Co-authored-by: Marko <marko@baricevic.me>

baseapp/msg_service_router.go

@@ -3,6 +3,7 @@ package baseapp
 import (
 	"context"
 	"fmt"
+	"reflect"
 
 	abci "github.com/cometbft/cometbft/abci/types"
 	gogogrpc "github.com/cosmos/gogoproto/grpc"
@@ -139,20 +140,22 @@ func (msr *MsgServiceRouter) registerMsgServiceHandler(sd *grpc.ServiceDesc, met
 	methodHandler := method.Handler
 
 	var requestTypeName string
+	var theMsg sdk.Msg
 
 	// NOTE: This is how we pull the concrete request type for each handler for registering in the InterfaceRegistry.
 	// This approach is maybe a bit hacky, but less hacky than reflecting on the handler object itself.
 	// We use a no-op interceptor to avoid actually calling into the handler itself.
 	_, _ = methodHandler(nil, context.Background(), func(i interface{}) error {
-		msg, ok := i.(sdk.Msg)
+		var ok bool
+		theMsg, ok = i.(sdk.Msg)
 		if !ok {
 			// We panic here because there is no other alternative and the app cannot be initialized correctly
 			// this should only happen if there is a problem with code generation in which case the app won't
 			// work correctly anyway.
 			panic(fmt.Errorf("unable to register service method %s: %T does not implement sdk.Msg", fqMethod, i))
 		}
 
-		requestTypeName = sdk.MsgTypeURL(msg)
+		requestTypeName = sdk.MsgTypeURL(theMsg)
 		return nil
 	}, noopInterceptor)
 
@@ -171,6 +174,9 @@ func (msr *MsgServiceRouter) registerMsgServiceHandler(sd *grpc.ServiceDesc, met
 			requestTypeName,
 		)
 	}
+	if reflect.TypeOf(reqType) != reflect.TypeOf(theMsg) {
+		return fmt.Errorf("the type registered with the interface registry %T does not match the type in the handler %T", reqType, theMsg)
+	}
 
 	// Check that each service is only registered once. If a service is
 	// registered more than once, then we should error. Since we can't

types/msgservice/msg_service.go

@@ -1,18 +1,10 @@
 package msgservice
 
 import (
-	"bytes"
-	"compress/gzip"
-	"fmt"
-	"io"
 	"reflect"
 
 	"github.com/cosmos/gogoproto/proto"
 	"google.golang.org/grpc"
-	proto2 "google.golang.org/protobuf/proto"
-	"google.golang.org/protobuf/reflect/protodesc"
-	"google.golang.org/protobuf/reflect/protoreflect"
-	"google.golang.org/protobuf/types/descriptorpb"
 
 	"cosmossdk.io/core/registry"
 
@@ -21,54 +13,28 @@ import (
 )
 
 // RegisterMsgServiceDesc registers all type_urls from Msg services described
-// in `sd` into the registry.
+// in `sd` into the registry. The ServiceDesc must be a standard gRPC ServiceDesc
+// from a generated file as this function will use reflection to extract the
+// concrete types and expects the HandlerType to follow the normal
+// generated type conventions.
 func RegisterMsgServiceDesc(registrar registry.InterfaceRegistrar, sd *grpc.ServiceDesc) {
-	fdBytesUnzipped := unzip(proto.FileDescriptor(sd.Metadata.(string)))
-	if fdBytesUnzipped == nil {
-		panic(fmt.Errorf("error unzipping file description for MsgService %s", sd.ServiceName))
+	handlerType := reflect.TypeOf(sd.HandlerType).Elem()
+	msgType := reflect.TypeOf((*proto.Message)(nil)).Elem()
+	numMethods := handlerType.NumMethod()
+	for i := 0; i < numMethods; i++ {
+		method := handlerType.Method(i)
+		numIn := method.Type.NumIn()
+		numOut := method.Type.NumOut()
+		if numIn != 2 || numOut != 2 {
+			continue
+		}
+		reqType := method.Type.In(1)
+		resType := method.Type.Out(0)
+		if reqType.AssignableTo(msgType) && resType.AssignableTo(msgType) {
+			req := reflect.New(reqType.Elem()).Interface()
+			registrar.RegisterImplementations((*sdk.Msg)(nil), req.(proto.Message))
+			res := reflect.New(resType.Elem()).Interface()
+			registrar.RegisterImplementations((*tx.MsgResponse)(nil), res.(proto.Message))
+		}
 	}
-
-	fdRaw := &descriptorpb.FileDescriptorProto{}
-	err := proto2.Unmarshal(fdBytesUnzipped, fdRaw)
-	if err != nil {
-		panic(err)
-	}
-
-	fd, err := protodesc.FileOptions{
-		AllowUnresolvable: true,
-	}.New(fdRaw, nil)
-	if err != nil {
-		panic(err)
-	}
-
-	prefSd := fd.Services().ByName(protoreflect.FullName(sd.ServiceName).Name())
-	for i := 0; i < prefSd.Methods().Len(); i++ {
-		md := prefSd.Methods().Get(i)
-		requestDesc := md.Input()
-		responseDesc := md.Output()
-
-		reqTyp := proto.MessageType(string(requestDesc.FullName()))
-		respTyp := proto.MessageType(string(responseDesc.FullName()))
-
-		// Register sdk.Msg and sdk.MsgResponse to the registry.
-		registrar.RegisterImplementations((*sdk.Msg)(nil), reflect.New(reqTyp).Elem().Interface().(proto.Message))
-		registrar.RegisterImplementations((*tx.MsgResponse)(nil), reflect.New(respTyp).Elem().Interface().(proto.Message))
-	}
-}
-
-func unzip(b []byte) []byte {
-	if b == nil {
-		return nil
-	}
-	r, err := gzip.NewReader(bytes.NewReader(b))
-	if err != nil {
-		panic(err)
-	}
-
-	unzipped, err := io.ReadAll(r)
-	if err != nil {
-		panic(err)
-	}
-
-	return unzipped
 }