Spring Cloud Gateway 缓存区异常问题及解决方案
作者:小徐很努力
最近在测试环境spring cloud gateway突然出现了异常,接下来通过本文给大家介绍Spring Cloud Gateway 缓存区异常问题解决方案,需要的朋友可以参考下
最近在测试环境spring cloud gateway突然出现了异常,在这里记录一下,直接上干货
1、问题背景
测试环境spring cloud gateway遇到以下异常
DataBufferLimitException: Exceeded limit on max bytes to buffer : 262144(超出了缓冲区的最大字节数限制)
乍一看,问题很简单啊,通过配置加大缓存区不就行了啊,于是就在application.yml加了以下配置
#将缓存区设置为2m spring: codec: max-in-memory-size: 2MB
可是问题又出现了,通过调试发现配置的max-in-memory-size在程序启动初始化确实是生效的。但是有业务调用的时候,此参数的接收值为null,maxInMemorySize还是读取的默认值(256K)。
那咋整,只能从源码入手了。
2、分析源码过程
通过异常日志,可以定位到异常位置
后来发现我们自定义的拦截器获取body的信息是获取方式,代码如下
因为HandlerStrategies.withDefaults() 是每次都需要重新创建对象,并非是spring注入的对象,所以每次获取的都是默认值,导致配置不生效。
3、解决办法
在我们自定的拦截器中注入ServerCodecConfigurer类,通过该类获取配置。这样获取到的就是我们在application.yml中配置的缓存区配置的字节数限制了。
具体代码:
@Component @Slf4j public class RequestFilter implements GlobalFilter, Ordered { @Override public int getOrder() { return OrderedConstant.HIGHEST_PRECEDENCE; } //手动注入ServerCodecConfigurer @Autowired ServerCodecConfigurer codecConfigurer; @Override public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) { StopWatch stopWatch = new StopWatch(); stopWatch.start(); long startTime = System.currentTimeMillis(); try { final Log logDTO = new Log(); ServerHttpRequest request = exchange.getRequest(); // 设置X-Request-Id AtomicReference<String> requestId = new AtomicReference<>(GenerateIdUtils.requestIdWithUUID()); Consumer<HttpHeaders> httpHeadersConsumer = httpHeaders -> { String headerRequestId = request.getHeaders().getFirst(HeaderConstant.REQUEST_ID); if (!Strings.isNullOrEmpty(headerRequestId)) { requestId.set(headerRequestId); } logDTO.setRequestId(requestId.get()); httpHeaders.set(HeaderConstant.REQUEST_ID, requestId.get()); httpHeaders.set(HeaderConstant.START_TIME_KEY, String.valueOf(startTime)); }; // codecConfigurer.getReaders()获取pplication.yml中配置的缓存区配置的字节数 ServerRequest serverRequest = ServerRequest.create(exchange, codecConfigurer.getReaders()); URI requestUri = request.getURI(); String uriQuery = requestUri.getQuery(); String url = requestUri.getPath() + (!Strings.isNullOrEmpty(uriQuery) ? "?" + uriQuery : ""); HttpHeaders headers = request.getHeaders(); MediaType mediaType = headers.getContentType(); String method = request.getMethodValue().toUpperCase(); // 原始请求体 final AtomicReference<String> requestBody = new AtomicReference<>(); final AtomicBoolean newBody = new AtomicBoolean(false); if (mediaType != null && LogHelper.isUploadFile(mediaType)) { requestBody.set("上传文件"); } else { if (method.equals("GET")) { if (!Strings.isNullOrEmpty(uriQuery)) { requestBody.set(uriQuery); } } else { newBody.set(true); } } logDTO.setLevel(Log.LEVEL.INFO); logDTO.setRequestUrl(url); logDTO.setRequestBody(requestBody.get()); logDTO.setRequestMethod(method); logDTO.setIp(IpUtils.getClientIp(request)); ServerHttpRequest serverHttpRequest = exchange.getRequest().mutate().headers(httpHeadersConsumer).build(); ServerWebExchange build = exchange.mutate().request(serverHttpRequest).build(); return build.getSession().flatMap(webSession -> { logDTO.setSessionId(webSession.getId()); if (newBody.get() && headers.getContentLength() > 0) { Mono<String> bodyToMono = serverRequest.bodyToMono(String.class); return bodyToMono.flatMap(reqBody -> { logDTO.setRequestBody(reqBody); // 重写原始请求 ServerHttpRequestDecorator requestDecorator = new ServerHttpRequestDecorator(exchange.getRequest()) { @Override public Flux<DataBuffer> getBody() { NettyDataBufferFactory nettyDataBufferFactory = new NettyDataBufferFactory(new UnpooledByteBufAllocator(false)); DataBuffer bodyDataBuffer = nettyDataBufferFactory.wrap(reqBody.getBytes()); return Flux.just(bodyDataBuffer); } }; return chain.filter(exchange.mutate() .request(requestDecorator) .build()).then(LogHelper.doRecord(logDTO)); }); } else { return chain.filter(exchange).then(LogHelper.doRecord(logDTO)); } }); } catch (Exception e) { log.error("请求日志打印出现异常", e); return chain.filter(exchange); } } }
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