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interceptor.go
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/
interceptor.go
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package validator
import (
"context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type Validator interface {
Validate() error
}
func UnaryServerInterceptor() grpc.UnaryServerInterceptor {
return func(ctx context.Context, req any, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp any, err error) {
if validator, ok := req.(Validator); ok {
if err := validator.Validate(); err != nil {
return nil, status.Error(codes.InvalidArgument, err.Error())
}
}
return handler(ctx, req)
}
}
func StreamServerInterceptor() grpc.StreamServerInterceptor {
return func(srv any, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
wrapper := &recvWrapper{stream}
return handler(srv, wrapper)
}
}
type recvWrapper struct {
grpc.ServerStream
}
func (s *recvWrapper) RecvMsg(m any) error {
if err := s.ServerStream.RecvMsg(m); err != nil {
return err
}
if validator, ok := m.(Validator); ok {
if err := validator.Validate(); err != nil {
return err
}
}
return nil
}