[英]Handle empty flux body in client request
我正在 springboot webflux 中创建一个批量插入休息端点,它看起来如下所示并且按预期工作,除非客户端发送插入 0 个对象的请求。 我知道插入 0 个元素对于批量插入来说是一个非常极端的边缘情况,但我希望它默默地做任何事情而不是失败。
package test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
@SpringBootApplication
@RestController
public class Application {
private static final Logger log = LoggerFactory.getLogger(Application.class);
public static void main(String[] args) {
// ignore args and just enable debug mode
SpringApplication.run(Application.class, args);
}
@PostMapping("/insert")
@ResponseBody
public static Mono<Void> insert(@RequestBody Flux<MyObject> objects) {
// implementation details not important
return objects
.doOnNext(obj -> log.info("inserting: " + obj.value))
.then();
}
public static class MyObject {
// actual contents not important
public String value;
}
}
运行curl -XPOST -H"Content-Type: application/stream+json" localhost:8080/insert
将在服务器日志中生成以下内容:
2019-12-06 12:30:27.217 DEBUG 18372 --- [ctor-http-nio-7] o.s.w.s.adapter.HttpWebHandlerAdapter : [137c5b5c] HTTP POST "/insert"
2019-12-06 12:30:27.218 DEBUG 18372 --- [ctor-http-nio-7] s.w.r.r.m.a.RequestMappingHandlerMapping : [137c5b5c] Mapped to test.Application#insert(Flux)
2019-12-06 12:30:27.219 DEBUG 18372 --- [ctor-http-nio-7] .r.m.a.RequestBodyMethodArgumentResolver : [137c5b5c] Content-Type:application/stream+json
2019-12-06 12:30:27.219 DEBUG 18372 --- [ctor-http-nio-7] .r.m.a.RequestBodyMethodArgumentResolver : [137c5b5c] 0..N [test.Application$MyObject]
2019-12-06 12:30:27.221 DEBUG 18372 --- [ctor-http-nio-7] a.w.r.e.AbstractErrorWebExceptionHandler : [137c5b5c] Resolved [ServerWebInputException: 400 BAD_REQUEST "Request body is missing: public static reactor.core.publisher.Mono<java.lang.Void> test.Application.insert(reactor.core.publisher.Flux<test.Application$MyObject>)"] for HTTP POST /insert
2019-12-06 12:30:27.221 DEBUG 18372 --- [ctor-http-nio-7] o.s.http.codec.json.Jackson2JsonEncoder : [137c5b5c] Encoding [{timestamp=Fri Dec 06 12:30:27 EST 2019, path=/insert, status=400, error=Bad Request, message=Reques (truncated)...]
2019-12-06 12:30:27.222 DEBUG 18372 --- [ctor-http-nio-7] o.s.w.s.adapter.HttpWebHandlerAdapter : [137c5b5c] Completed 400 BAD_REQUEST
我不明白的是为什么当日志清楚地表明它被路由到test.Application#insert(Flux)
和0..N [test.Application$MyObject]
作为请求正文时它会0..N [test.Application$MyObject]
0 个元素应该是有效的。
可能是@RequestBody(required = false)
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