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angular - 如何将请求范围服务的实例传递给全局拦截器

问题描述

我Nest JS在后端使用。我有日志服务scoped.Request

@Injectable({ scope: Scope.REQUEST })
export class LoggingService extends BaseLoggerService implements LoggerService {
  constructor(readonly configService: ConfigurationService, @Inject(RequestContextService) readonly requestContextService: IRequestContextService) {}

我有需要日志服务的全局拦截器。

@Injectable()
export class LoggingInterceptor implements NestInterceptor {
    constructor(@Inject(LoggingService) private readonly logger: LoggingService) {
    }  }

现在在 app.ts 中，我试图定义useGlobalInterceptors绕过Logging service. 但是，它会在npm run start.

app.useGlobalInterceptors(new LoggingInterceptor(app.get(LoggingService)));

错误

2020-02-20T10:51:54.409Z ERROR [object Object] (RID:NOT_SET RP:NOT_SET TK:) (AN:NOT_SET COM:NOT_SET UAN:NOT_SET) LoggingService is marked as a scoped provider. Request and transient-scoped providers can't be used in combination with "get()" method. Please, use "resolve()" instead. Error: LoggingService is marked as a scoped provider. Request and transient-scoped providers can't be used in combination with "get()" method. Please, use "resolve()" instead.

标签： angularinterceptornestjs

解决方案

正如错误所述，由于LoggerService是REQUEST作用域，您需要使用await app.resolve<LoggingService>(LoggingService)，但是，您可能想要做的是全局绑定拦截器，并让 Nest 通过将拦截器添加到providers数组来处理依赖注入，如下所示：

@Module({
  imports: [...],
  providers: [
    {
      provide: APP_INTERCEPTOR,
      useClass: LoggingInterceptor
    },
    ...
  ]
})
export class AppModule {}

需要记住的是，拦截器已经拥有可用的整个请求上下文。另外，我不确定增强器在 REQUEST 范围内如何发挥作用（如果它具有 REQUEST 范围的依赖项会发生这种情况），因此请记住，这可能不是最好的前进路线。

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