Spring Cloud Gateway 获取请求体(Request Body)的多种方法
一、直接在全局拦截器中获取,伪代码如下
private string resolvebodyfromrequest(serverhttprequest serverhttprequest){ flux<databuffer> body = serverhttprequest.getbody(); atomicreference<string> bodyref = new atomicreference<>(); body.subscribe(buffer -> { charbuffer charbuffer = standardcharsets.utf_8.decode(buffer.asbytebuffer()); databufferutils.release(buffer); bodyref.set(charbuffer.tostring()); }); return bodyref.get(); }
存在的缺陷:其他拦截器无法再通过该方式获取请求体(因为请求体已被消费),并且会抛出异常
only one connection receive subscriber allowed.caused by: java.lang.illegalstateexception: only one connection receive subscriber allowed.
异常原因:实际上spring-cloud-gateway反向代理的原理是,首先读取原请求的数据,然后构造一个新的请求,将原请求的数据封装到新的请求中,然后再转发出去。然而我们在他封装之前读取了一次request body,而request body只能读取一次。因此就出现了上面的错误。
再者受版本限制
这种方法在spring-boot-starter-parent 2.0.6.release + spring cloud finchley.sr2 body 中生效,
但是在spring-boot-starter-parent 2.1.0.release + spring cloud greenwich.m3 body 中不生效,总是为空
二、先在全局过滤器中获取,然后再把request重新包装,继续向下传递传递
@override public gatewayfilter apply(namevalueconfig namevalueconfig) { return (exchange, chain) -> { uri uri = exchange.getrequest().geturi(); uri ex = uricomponentsbuilder.fromuri(uri).build(true).touri(); serverhttprequest request = exchange.getrequest().mutate().uri(ex).build(); if("post".equalsignorecase(request.getmethodvalue())){//判断是否为post请求 flux<databuffer> body = request.getbody(); atomicreference<string> bodyref = new atomicreference<>(); body.subscribe(databuffer -> { charbuffer charbuffer = standardcharsets.utf_8.decode(databuffer.asbytebuffer()); databufferutils.release(databuffer); bodyref.set(charbuffer.tostring()); });//读取request body到缓存 string bodystr = bodyref.get();//获取request body system.out.println(bodystr);//这里是我们需要做的操作 databuffer bodydatabuffer = stringbuffer(bodystr); flux<databuffer> bodyflux = flux.just(bodydatabuffer); request = new serverhttprequestdecorator(request){ @override public flux<databuffer> getbody() { return bodyflux; } };//封装我们的request } return chain.filter(exchange.mutate().request(request).build()); }; } protected databuffer stringbuffer(string value) { byte[] bytes = value.getbytes(standardcharsets.utf_8); nettydatabufferfactory nettydatabufferfactory = new nettydatabufferfactory(bytebufallocator.default); databuffer buffer = nettydatabufferfactory.allocatebuffer(bytes.length); buffer.write(bytes); return buffer; }
该方案的缺陷:request body获取不完整(因为异步原因),只能获取1024b的数据。并且请求体超过1024b,会出现响应超慢(因为我是开启了熔断)。
三、过滤器加路线定位器
翻查源码发现readbodypredicatefactory里面缓存了request body的信息,于是在自定义router中配置了readbodypredicatefactory,然后在filter中通过cachedrequestbodyobject缓存字段获取request body信息。
/** * @description: 获取post请求的请求体 * readbodypredicatefactory 发现里面缓存了request body的信息, * 于是在自定义router中配置了readbodypredicatefactory * @modified: */ @enableautoconfiguration @configuration public class routelocatorrequestboby{ //自定义过滤器 @resource private reqtracefilter reqtracefilter; @resource private ribbonloadbalancerclient ribbonloadbalancerclient; private static final string service = "/leap/**"; private static final string http_prefix = "http://"; private static final string colon = ":"; @bean public routelocator myroutes(routelocatorbuilder builder) { //通过负载均衡获取服务实例 serviceinstance instance = ribbonloadbalancerclient.choose("platform-service"); //拼接路径 stringbuilder forwardaddress = new stringbuilder(http_prefix); forwardaddress.append(instance.gethost()) .append(colon) .append(instance.getport()); return builder.routes() //拦截请求类型为post content-type application/json application/json;charset=utf-8 .route(r -> r .header(httpheaders.content_type, mediatype.application_json_value + mediatype.application_json_utf8_value) .and() .method(httpmethod.post) .and() //获取缓存中的请求体 .readbody(object.class, readbody -> { return true; }) .and() .path(service) //把请求体传递给拦截器reqtracefilter .filters(f -> { f.filter(reqtracefilter); return f; }) .uri(forwardaddress.tostring())).build(); } /** * @description: 过滤器,用于获取请求体,和处理请求体业务,列如记录日志 * @modified: */ @component public class reqtracefilter implements globalfilter, gatewayfilter,ordered { private static final string content_type = "content-type"; private static final string content_type_json = "application/json"; //获取请求路由详细信息route route = exchange.getattribute(gateway_route_bean) private static final string gateway_route_bean = "org.springframework.cloud.gateway.support.serverwebexchangeutils.gatewayroute"; private static final string cache_request_body_object_key = "cachedrequestbodyobject"; @override public mono<void> filter(serverwebexchange exchange, gatewayfilterchain chain) { serverhttprequest request = exchange.getrequest(); //判断过滤器是否执行 string requesturl = requestutils.getcurrentrequest(request); if (!requestutils.isfilter(requesturl)) { string bodystr = ""; string contenttype = request.getheaders().getfirst(content_type); string method = request.getmethodvalue(); //判断是否为post请求 if (null != contenttype && httpmethod.post.name().equalsignorecase(method) && contenttype.contains(content_type_json)) { object cachedbody = exchange.getattribute(cache_request_body_object_key); if(null != cachedbody){ bodystr = cachedbody.tostring(); } } if (httpmethod.get.name().equalsignorecase(method)) { bodystr = request.getqueryparams().tostring(); } log.info("请求体内容:{}",bodystr); } return chain.filter(exchange); } @override public int getorder() { return 5; } }
该方案优点:这种解决,一不会带来重复读取问题,二不会带来requestbody取不全问题。三在低版本的spring cloud finchley.sr2也可以运行。
缺点:不支持multipart/form-data(异常415),这个致命。
四、通过org.springframework.cloud.gateway.filter.factory.rewrite
包下有个modifyrequestbodygatewayfilterfactory
,顾名思义,这就是修改 request body 的过滤器工厂类。
@component @slf4j public class reqtracefilter implements globalfilter, gatewayfilter, ordered { @resource private iplatformfeignclient platformfeignclient; /** * httpheader,traceid的key名称 */ private static final string requestid = "traceid"; private static final string content_type = "content-type"; private static final string content_type_json = "application/json"; private static final string gateway_route_bean = "org.springframework.cloud.gateway.support.serverwebexchangeutils.gatewayroute"; @override public mono<void> filter(serverwebexchange exchange, gatewayfilterchain chain) { serverhttprequest request = exchange.getrequest(); //判断过滤器是否执行 string requesturl = requestutils.getcurrentrequest(request); if (!requestutils.isfilter(requesturl)) { string bodystr = ""; string contenttype = request.getheaders().getfirst(content_type); string method = request.getmethodvalue(); //判断是否为post请求 if (null != contenttype && httpmethod.post.name().equalsignorecase(method) && contenttype.contains(content_type_json)) { serverrequest serverrequest = new defaultserverrequest(exchange); list<string> list = new arraylist<>(); // 读取请求体 mono<string> modifiedbody = serverrequest.bodytomono(string.class) .flatmap(body -> { //记录请求体日志 final string nid = saverequestoperlog(exchange, body); //记录日志id list.add(nid); return mono.just(body); }); bodyinserter bodyinserter = bodyinserters.frompublisher(modifiedbody, string.class); httpheaders headers = new httpheaders(); headers.putall(exchange.getrequest().getheaders()); headers.remove(httpheaders.content_length); cachedbodyoutputmessage outputmessage = new cachedbodyoutputmessage(exchange, headers); return bodyinserter.insert(outputmessage, new bodyinsertercontext()) .then(mono.defer(() -> { serverhttprequestdecorator decorator = new serverhttprequestdecorator( exchange.getrequest()) { @override public httpheaders getheaders() { long contentlength = headers.getcontentlength(); httpheaders httpheaders = new httpheaders(); httpheaders.putall(super.getheaders()); httpheaders.put(requestid,list); if (contentlength > 0) { httpheaders.setcontentlength(contentlength); } else { httpheaders.set(httpheaders.transfer_encoding, "chunked"); } return httpheaders; } @override public flux<databuffer> getbody() { return outputmessage.getbody(); } }; return chain.filter(exchange.mutate().request(decorator).build()); })); } if (httpmethod.get.name().equalsignorecase(method)) { bodystr = request.getqueryparams().tostring(); string nid = saverequestoperlog(exchange, bodystr); serverhttprequest userinfo = exchange.getrequest().mutate() .header(requestid, nid).build(); return chain.filter(exchange.mutate().request(userinfo).build()); } } return chain.filter(exchange); } /** * 保存请求日志 * * @param exchange * @param requestparameters * @return */ private string saverequestoperlog(serverwebexchange exchange, string requestparameters) { log.debug("接口请求参数:{}", requestparameters); serverhttprequest request = exchange.getrequest(); string ip = objects.requirenonnull(request.getremoteaddress()).getaddress().gethostaddress(); saveoperlogvo vo = new saveoperlogvo(); vo.setip(ip); vo.setrequrl(requestutils.getcurrentrequest(request)); vo.setreqmethod(request.getmethodvalue()); vo.setrequestparameters(requestparameters); route route = exchange.getattribute(gateway_route_bean); //是否配置路由 if (route != null) { vo.setsubsystem(route.getid()); } resentity<string> res = platformfeignclient.saveoperlog(vo); log.debug("当前请求id返回的数据:{}", res); return res.getdata(); } @override public int getorder() { return 5; } }
该方案:完美解决以上所有问题
参考文档:
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