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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);
        }
    }
}

到此这篇关于Spring Cloud Gateway 缓存区异常的文章就介绍到这了,更多相关Spring Cloud Gateway 缓存区内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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