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|
package handwrittenvalidation
import (
"context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type handwrittenValidator interface {
HandwrittenValidate() error
}
// UnaryServerInterceptor returns a new unary server interceptor that runs the handwritten validation
// on the incoming request, if any.
func UnaryServerInterceptor(ctx context.Context, req interface{}, _ *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
validator, ok := req.(handwrittenValidator)
if ok {
err := validator.HandwrittenValidate()
if err != nil {
return nil, status.Errorf(codes.InvalidArgument, "%s", err)
}
}
return handler(ctx, req)
}
// StreamServerInterceptor returns a new stream server interceptor that runs the handwritten validation
// on the incoming request messages, if any.
func StreamServerInterceptor(srv interface{}, stream grpc.ServerStream, _ *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
wrapper := &recvWrapper{stream}
return handler(srv, wrapper)
}
type recvWrapper struct {
grpc.ServerStream
}
func (s *recvWrapper) RecvMsg(m interface{}) error {
if err := s.ServerStream.RecvMsg(m); err != nil {
return err
}
validator, ok := m.(handwrittenValidator)
if ok {
err := validator.HandwrittenValidate()
if err != nil {
return err
}
}
return nil
}
|
