I18nRequestScopeService does not work with gRPC

I18nRequestScopeService gets the i18nLang from REQUEST (this.req.i18nLang), but when using gRPC, the interceptor stores this information in context and the service does not get the variable correctly. https://github.com/ToonvanStrijp/nestjs-i18n/blob/master/src/utils/context.ts

case 'rpc':
        return context.switchToRpc().getContext();

Using gRPC, i18nLang is not in the root of the object but inside context:

I18nRequestScopeService {
  req: RequestContextHost {
    pattern: {
      service: 'EmailService',
      rpc: 'sendRegistrationConfirmEmail',
      streaming: 'no_stream'
    },
    data: {
      email: 'test@davidramosweb.com',
    },
    context: Metadata {
      internalRepr: [Map],
      options: {},
      i18nService: [I18nService],
      i18nLang: 'fr'
    }
  },

A possible solution could be to check if this.req.context.i18nLang exists: https://github.com/ToonvanStrijp/nestjs-i18n/blob/master/src/services/i18n-request-scope.service.ts

@Injectable({ scope: Scope.REQUEST })
export class I18nRequestScopeService {
  constructor(
    @Inject(REQUEST) private readonly req,
    private readonly i18nService: I18nService,
  ) {}

  public translate(key: string, options?: translateOptions) {
    const lang = (!this.req.i18nLang && this.req.context) ? this.req.context.i18nLang : this.req.i18nLang;
    options = {
        lang,
      ...options,
    };
    return this.i18nService.translate(key, options);
  }

  public t(key: string, options?: translateOptions) {
    return this.translate(key, options);
  }
}

toonvanstrijp / nestjs-i18n

I18nRequestScopeService does not work with gRPC #223