package defaulter import ( "context" "google.golang.org/grpc" "go.linka.cloud/grpc-toolkit/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) }