NestJS - gRPC exception

https://grpc.github.io/grpc/core/md_doc_statuscodes.html
https://grpc.io/docs/guides/status-codes/

Code	Number
OK	0
CANCELLED	1
UNKNOWN	2
INVALID_ARGUMENT	3
DEADLINE_EXCEEDED	4
NOT_FOUND	5
ALREADY_EXISTS	6
PERMISSION_DENIED	7
RESOURCE_EXHAUSTED	8
FAILED_PRECONDITION	9
ABORTED	10
OUT_OF_RANGE	11
UNIMPLEMENTED	12
INTERNAL	13
UNAVAILABLE	14
DATA_LOSS	15
UNAUTHENTICATED	16

https://www.npmjs.com/package/nestjs-grpc-exceptions
https://github.com/mohsenbostan/nestjs-grpc-exceptions/blob/main/lib/utils/http-codes-map.ts

export const HTTP_CODE_FROM_GRPC: Record<number, number> = {
  [Status.OK]: HttpStatus.OK,
  [Status.CANCELLED]: HttpStatus.METHOD_NOT_ALLOWED,
  [Status.UNKNOWN]: HttpStatus.BAD_GATEWAY,
  [Status.INVALID_ARGUMENT]: HttpStatus.UNPROCESSABLE_ENTITY,
  [Status.DEADLINE_EXCEEDED]: HttpStatus.REQUEST_TIMEOUT,
  [Status.NOT_FOUND]: HttpStatus.NOT_FOUND,
  [Status.ALREADY_EXISTS]: HttpStatus.CONFLICT,
  [Status.PERMISSION_DENIED]: HttpStatus.FORBIDDEN,
  [Status.RESOURCE_EXHAUSTED]: HttpStatus.TOO_MANY_REQUESTS,
  [Status.FAILED_PRECONDITION]: HttpStatus.PRECONDITION_REQUIRED,
  [Status.ABORTED]: HttpStatus.METHOD_NOT_ALLOWED,
  [Status.OUT_OF_RANGE]: HttpStatus.PAYLOAD_TOO_LARGE,
  [Status.UNIMPLEMENTED]: HttpStatus.NOT_IMPLEMENTED,
  [Status.INTERNAL]: HttpStatus.INTERNAL_SERVER_ERROR,
  [Status.UNAVAILABLE]: HttpStatus.NOT_FOUND,
  [Status.DATA_LOSS]: HttpStatus.INTERNAL_SERVER_ERROR,
  [Status.UNAUTHENTICATED]: HttpStatus.UNAUTHORIZED,
};

• https://docs.nestjs.com/exception-filters#exception-filters-1
• https://docs.nestjs.com/microservices/exception-filters#filters
• https://github.com/algoan/nestjs-components/blob/master/packages/http-exception-filter/src/http-exception-filter.ts
• https://github.com/nestjs/nest/blob/master/sample/03-microservices/src/common/filters/rpc-exception.filter.ts

import { Catch, RpcExceptionFilter, ArgumentsHost } from '@nestjs/common';
import { Observable, throwError } from 'rxjs';
import { RpcException } from '@nestjs/microservices';

@Catch(RpcException)
export class ExceptionFilter implements RpcExceptionFilter<RpcException> {
  catch(exception: RpcException, host: ArgumentsHost): Observable<any> {
    return throwError(() => exception.getError());
  }
}