options: fix interceptors, add defaulter and recovery

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)
+}