怎么做网站站长2020 惠州seo服务
在基于SpringCloud开发的微服务中，我们一般会选择在网关层记录请求和响应日志，并将其收集到ELK中用作查询和分析。
今天我们就来看看如何实现此功能。
日志实体类
首先我们在网关中定义一个日志实体，用于组装日志对象
@Data
public class AccessLog {/**用户编号**/private Long userId;/**路由**/private String targetServer;/**协议**/private String schema;/**请求方法名**/private String requestMethod;/**访问地址**/private String requestUrl;/**请求IP**/private String clientIp;/**查询参数**/private MultiValueMap<String, String> queryParams;/**请求体**/private String requestBody;/**请求头**/private MultiValueMap<String, String> requestHeaders;/**响应体**/private String responseBody;/**响应头**/private MultiValueMap<String, String> responseHeaders;/**响应结果**/private HttpStatusCode httpStatusCode;/**开始请求时间**/private LocalDateTime startTime;/**结束请求时间**/private LocalDateTime endTime;/**执行时长，单位：毫秒**/private Integer duration;}
网关日志过滤器
接下来我们在网关中定义一个Filter，用于收集日志信息。
@Component
public class AccessLogFilter implements GlobalFilter, Ordered {private final List<HttpMessageReader<?>> messageReaders = HandlerStrategies.withDefaults().messageReaders();/*** 打印日志* @param accessLog 网关日志*/private void writeAccessLog(AccessLog accessLog) {log.info("----access---- : {}", JsonUtils.obj2StringPretty(accessLog));}/*** 顺序必须是<-1，否则标准的NettyWriteResponseFilter将在您的过滤器得到一个被调用的机会之前发送响应* 也就是说如果不小于 -1 ，将不会执行获取后端响应的逻辑* @return*/@Overridepublic int getOrder() {return -100;}@Overridepublic Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {// 将 Request 中可以直接获取到的参数，设置到网关日志ServerHttpRequest request = exchange.getRequest();AccessLog gatewayLog = new AccessLog();gatewayLog.setTargetServer(WebUtils.getGatewayRoute(exchange).getId());gatewayLog.setSchema(request.getURI().getScheme());gatewayLog.setRequestMethod(request.getMethod().name());gatewayLog.setRequestUrl(request.getURI().getRawPath());gatewayLog.setQueryParams(request.getQueryParams());gatewayLog.setRequestHeaders(request.getHeaders());gatewayLog.setStartTime(LocalDateTime.now());gatewayLog.setClientIp(WebUtils.getClientIP(exchange));// 继续 filter 过滤MediaType mediaType = request.getHeaders().getContentType();if (MediaType.APPLICATION_FORM_URLENCODED.isCompatibleWith(mediaType)|| MediaType.APPLICATION_JSON.isCompatibleWith(mediaType)) { // 适合 JSON 和 Form 提交的请求return filterWithRequestBody(exchange, chain, gatewayLog);}return filterWithoutRequestBody(exchange, chain, gatewayLog);}/*** 没有请求体的请求只需要记录日志*/private Mono<Void> filterWithoutRequestBody(ServerWebExchange exchange, GatewayFilterChain chain, AccessLog accessLog) {// 包装 Response，用于记录 Response BodyServerHttpResponseDecorator decoratedResponse = recordResponseLog(exchange, accessLog);return chain.filter(exchange.mutate().response(decoratedResponse).build()).then(Mono.fromRunnable(() -> writeAccessLog(accessLog)));}/*** 需要读取请求体* 参考 {@link ModifyRequestBodyGatewayFilterFactory} 实现*/private Mono<Void> filterWithRequestBody(ServerWebExchange exchange, GatewayFilterChain chain, AccessLog gatewayLog) {// 设置 Request Body 读取时，设置到网关日志ServerRequest serverRequest = ServerRequest.create(exchange, messageReaders);Mono<String> modifiedBody = serverRequest.bodyToMono(String.class).flatMap(body -> {gatewayLog.setRequestBody(body);return Mono.just(body);});// 通过 BodyInserter 插入 body(支持修改body), 避免 request body 只能获取一次BodyInserter<Mono<String>, ReactiveHttpOutputMessage> bodyInserter = BodyInserters.fromPublisher(modifiedBody, String.class);HttpHeaders headers = new HttpHeaders();headers.putAll(exchange.getRequest().getHeaders());// the new content type will be computed by bodyInserter// and then set in the request decoratorheaders.remove(HttpHeaders.CONTENT_LENGTH);CachedBodyOutputMessage outputMessage = new CachedBodyOutputMessage(exchange, headers);// 通过 BodyInserter 将 Request Body 写入到 CachedBodyOutputMessage 中return bodyInserter.insert(outputMessage, new BodyInserterContext()).then(Mono.defer(() -> {// 重新封装请求ServerHttpRequest decoratedRequest = requestDecorate(exchange, headers, outputMessage);// 记录响应日志ServerHttpResponseDecorator decoratedResponse = recordResponseLog(exchange, gatewayLog);// 记录普通的return chain.filter(exchange.mutate().request(decoratedRequest).response(decoratedResponse).build()).then(Mono.fromRunnable(() -> writeAccessLog(gatewayLog))); // 打印日志}));}/*** 记录响应日志* 通过 DataBufferFactory 解决响应体分段传输问题。*/private ServerHttpResponseDecorator recordResponseLog(ServerWebExchange exchange, AccessLog accessLog) {ServerHttpResponse response = exchange.getResponse();return new ServerHttpResponseDecorator(response) {@Overridepublic Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {if (body instanceof Flux) {DataBufferFactory bufferFactory = response.bufferFactory();// 计算执行时间accessLog.setEndTime(LocalDateTime.now());accessLog.setDuration((int) (LocalDateTimeUtil.between(accessLog.getStartTime(),accessLog.getEndTime()).toMillis()));accessLog.setResponseHeaders(response.getHeaders());accessLog.setHttpStatusCode(response.getStatusCode());// 获取响应类型，如果是 json 就打印String originalResponseContentType = exchange.getAttribute(ServerWebExchangeUtils.ORIGINAL_RESPONSE_CONTENT_TYPE_ATTR);if (StrUtil.isNotBlank(originalResponseContentType)&& originalResponseContentType.contains("application/json")) {Flux<? extends DataBuffer> fluxBody = Flux.from(body);return super.writeWith(fluxBody.buffer().map(dataBuffers -> {// 设置 response body 到网关日志byte[] content = readContent(dataBuffers);String responseResult = new String(content, StandardCharsets.UTF_8);accessLog.setResponseBody(responseResult);// 响应return bufferFactory.wrap(content);}));}}// if body is not a flux. never got there.return super.writeWith(body);}};}/*** 请求装饰器，支持重新计算 headers、body 缓存** @param exchange 请求* @param headers 请求头* @param outputMessage body 缓存* @return 请求装饰器*/private ServerHttpRequestDecorator requestDecorate(ServerWebExchange exchange, HttpHeaders headers, CachedBodyOutputMessage outputMessage) {return new ServerHttpRequestDecorator(exchange.getRequest()) {@Overridepublic HttpHeaders getHeaders() {long contentLength = headers.getContentLength();HttpHeaders httpHeaders = new HttpHeaders();httpHeaders.putAll(super.getHeaders());if (contentLength > 0) {httpHeaders.setContentLength(contentLength);} else {// TODO: this causes a 'HTTP/1.1 411 Length Required' // on// httpbin.orghttpHeaders.set(HttpHeaders.TRANSFER_ENCODING, "chunked");}return httpHeaders;}@Overridepublic Flux<DataBuffer> getBody() {return outputMessage.getBody();}};}/*** 从dataBuffers中读取数据* @author jam* @date 2024/5/26 22:31*/private byte[] readContent(List<? extends DataBuffer> dataBuffers) {// 合并多个流集合，解决返回体分段传输DataBufferFactory dataBufferFactory = new DefaultDataBufferFactory();DataBuffer join = dataBufferFactory.join(dataBuffers);byte[] content = new byte[join.readableByteCount()];join.read(content);// 释放掉内存DataBufferUtils.release(join);return content;}}
代码较长建议直接拷贝到编辑器，只要注意下面一个关键点：
getOrder()方法返回的值必须要<-1，否则标准的NettyWriteResponseFilter将在您的过滤器被调用的机会之前发送响应，即不会执行获取后端响应参数的方法
通过上面的两步我们已经可以获取到请求的输入输出参数了，在 writeAccessLog()中将其打印到日志文件，方便通过ELK进行收集。
在实际项目中，网关日志量一般会非常大，不建议使用数据库进行存储。
实际效果
服务正常响应
服务异常响应