在进入控制器之前,我需要在拦截器上获取请求正文:
import { Injectable, NestInterceptor, ExecutionContext, HttpException, HttpStatus } from '@nestjs/common';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';
@Injectable()
export class ExcludeNullInterceptor implements NestInterceptor {
intercept(context: ExecutionContext, call$: Observable<any>): Observable<any> {
// How can I get the request body here?
// Need to be BEFORE the Controller exec
}
}
答案 0 :(得分:2)
在拦截器中,您可以执行以下操作:
async intercept(context: ExecutionContext, stream$: Observable<any>): Observable<any> {
const body = context.switchToHttp().getRequest().body;
// e.g. throw an exception if property is missing
或者,您可以在直接访问请求的地方使用中间件:
(req, res, next) => {
答案 1 :(得分:0)
如果您的 interceptor
用于休息端点,我认为 Kim Kern completely covered this part in his answer。
还有使用 interceptor
和 controllers
的其他可能性。
例如,controller
可以作为微服务的入口点,例如监听 kafka 消息(或任何不同的消息):
@Controller()
export class DemoConsumerController {
private readonly logger = new Logger(DemoConsumerController.name);
@UseInterceptors(LogInterceptor)
@EventPattern('demo-topic')
async listenToKafkaMessage (
@Payload() payload,
@Ctx() context: KafkaContext,
) {
this.logger.debug(`payload: ${payload}`)
this.logger.verbose(`Topic: ${context.getTopic()}`);
this.logger.verbose(`KafkaContext: ${JSON.stringify(context)}`);
}
}
在这种情况下,要获取正文,或者最好说您需要稍加修改的消息:
intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
const value = context.switchToHttp().getRequest().value
// default rest part of code
return next.handle()
}
因此,为了避免误解,您可以验证您的请求以弄清楚该值包含您的有效负载:
console.log('getRequest: ', context.switchToHttp().getRequest())
// or
console.log('context: ', context)