本篇文章给大家分享的是有关在Spring中使用 Cloud与Gateway怎么记录请求并应答数据日志，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
具体方法如下：
public class GatewayContext {
public static final String CACHE_GATEWAY_CONTEXT = "cacheGatewayContext";
/**
* cache json body
*/
private String cacheBody;
/**
* cache formdata
*/
private MultiValueMap<String, String> formData;
/**
* cache reqeust path
*/
private String path;
public String getCacheBody() {
return cacheBody;
}
public void setCacheBody(String cacheBody) {
this.cacheBody = cacheBody;
}
public MultiValueMap<String, String> getFormData() {
return formData;
}
public void setFormData(MultiValueMap<String, String> formData) {
this.formData = formData;
}
public String getPath() {
return path;
}
public void setPath(String path) {
this.path = path;
}
}import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.core.io.buffer.NettyDataBufferFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpRequestDecorator;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.reactive.function.server.HandlerStrategies;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.server.ServerWebExchange;
import io.netty.buffer.ByteBufAllocator;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
// https://segmentfault.com/a/1190000017898354
@Component
public class LogRequestGlobalFilter
implements GlobalFilter {
/**
* default HttpMessageReader
*/
private static final List<HttpMessageReader<?>> messageReaders =
HandlerStrategies.withDefaults().messageReaders();
private Logger log = LoggerFactory.getLogger(LogRequestGlobalFilter.class);
@Override
public Mono<Void> filter(
ServerWebExchange exchange,
GatewayFilterChain chain) {
/**
* save request path and serviceId into gateway context
*/
ServerHttpRequest request = exchange.getRequest();
String path = request.getPath().pathWithinApplication().value();
GatewayContext gatewayContext = new GatewayContext();
gatewayContext.setPath(path);
/**
* save gateway context into exchange
*/
exchange.getAttributes().put(GatewayContext.CACHE_GATEWAY_CONTEXT,
gatewayContext);
HttpHeaders headers = request.getHeaders();
MediaType contentType = headers.getContentType();
log.info("start-------------------------------------------------");
log.info("HttpMethod:{},Url:{}", request.getMethod(),
request.getURI().getRawPath());
log.info("Headers token: {}", headers.getFirst("token"));
if (request.getMethod() == HttpMethod.GET) {
log.info("end-------------------------------------------------");
}
if (request.getMethod() == HttpMethod.POST) {
Mono<Void> voidMono = null;
if (MediaType.APPLICATION_JSON.equals(contentType)
|| MediaType.APPLICATION_JSON_UTF8.equals(contentType)) {
voidMono =
readBody(exchange, chain, gatewayContext);
}
if (MediaType.APPLICATION_FORM_URLENCODED.equals(contentType)) {
voidMono =
readFormData(exchange, chain, gatewayContext);
}
return voidMono;
}
/* log.debug(
"[GatewayContext]ContentType:{},Gateway context is set with {}",
contentType, gatewayContext);*/
return chain.filter(exchange);
}
/**
* ReadFormData
*
* @param exchange
* @param chain
* @return
*/
private Mono<Void> readFormData(
ServerWebExchange exchange,
GatewayFilterChain chain,
GatewayContext gatewayContext) {
final ServerHttpRequest request = exchange.getRequest();
HttpHeaders headers = request.getHeaders();
return exchange.getFormData()
.doOnNext(multiValueMap -> {
gatewayContext.setFormData(multiValueMap);
log.info("Post x-www-form-urlencoded:{}",
multiValueMap);
log.info(
"end-------------------------------------------------");
})
.then(Mono.defer(() -> {
Charset charset = headers.getContentType().getCharset();
charset = charset == null ? StandardCharsets.UTF_8 : charset;
String charsetName = charset.name();
MultiValueMap<String, String> formData =
gatewayContext.getFormData();
/**
* formData is empty just return
*/
if (null == formData || formData.isEmpty()) {
return chain.filter(exchange);
}
StringBuilder formDataBodyBuilder = new StringBuilder();
String entryKey;
List<String> entryValue;
try {
/**
* repackage form data
*/
for (Map.Entry<String, List<String>> entry : formData
.entrySet()) {
entryKey = entry.getKey();
entryValue = entry.getValue();
if (entryValue.size() > 1) {
for (String value : entryValue) {
formDataBodyBuilder.append(entryKey).append("=")
.append(
URLEncoder.encode(value, charsetName))
.append("&");
}
} else {
formDataBodyBuilder
.append(entryKey).append("=").append(URLEncoder
.encode(entryValue.get(0), charsetName))
.append("&");
}
}
} catch (UnsupportedEncodingException e) {
// ignore URLEncode Exception
}
/**
* substring with the last char '&'
*/
String formDataBodyString = "";
if (formDataBodyBuilder.length() > 0) {
formDataBodyString = formDataBodyBuilder.substring(0,
formDataBodyBuilder.length() - 1);
}
/**
* get data bytes
*/
byte[] bodyBytes = formDataBodyString.getBytes(charset);
int contentLength = bodyBytes.length;
ServerHttpRequestDecorator decorator =
new ServerHttpRequestDecorator(
request) {
/**
* change content-length
*
* @return
*/
@Override
public HttpHeaders getHeaders() {
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.putAll(super.getHeaders());
if (contentLength > 0) {
httpHeaders.setContentLength(contentLength);
} else {
httpHeaders.set(HttpHeaders.TRANSFER_ENCODING,
"chunked");
}
return httpHeaders;
}
/**
* read bytes to Flux<Databuffer>
*
* @return
*/
@Override
public Flux<DataBuffer> getBody() {
return DataBufferUtils
.read(new ByteArrayResource(bodyBytes),
new NettyDataBufferFactory(
ByteBufAllocator.DEFAULT),
contentLength);
}
};
ServerWebExchange mutateExchange =
exchange.mutate().request(decorator).build();
/* log.info("[GatewayContext]Rewrite Form Data :{}",
formDataBodyString);*/
return chain.filter(mutateExchange);
}));
}
/**
* ReadJsonBody
*
* @param exchange
* @param chain
* @return
*/
private Mono<Void> readBody(
ServerWebExchange exchange,
GatewayFilterChain chain,
GatewayContext gatewayContext) {
/**
* join the body
*/
return DataBufferUtils.join(exchange.getRequest().getBody())
.flatMap(dataBuffer -> {
/*
* read the body Flux<DataBuffer>, and release the buffer
* //TODO when SpringCloudGateway Version Release To G.SR2,this can be update with the new version's feature
* see PR https://github.com/spring-cloud/spring-cloud-gateway/pull/1095
*/
byte[] bytes = new byte[dataBuffer.readableByteCount()];
dataBuffer.read(bytes);
DataBufferUtils.release(dataBuffer);
Flux<DataBuffer> cachedFlux = Flux.defer(() -> {
DataBuffer buffer =
exchange.getResponse().bufferFactory().wrap(bytes);
DataBufferUtils.retain(buffer);
return Mono.just(buffer);
});
/**
* repackage ServerHttpRequest
*/
ServerHttpRequest mutatedRequest =
new ServerHttpRequestDecorator(exchange.getRequest()) {
@Override
public Flux<DataBuffer> getBody() {
return cachedFlux;
}
};
/**
* mutate exchage with new ServerHttpRequest
*/
ServerWebExchange mutatedExchange =
exchange.mutate().request(mutatedRequest).build();
/**
* read body string with default messageReaders
*/
return ServerRequest.create(mutatedExchange, messageReaders)
.bodyToMono(String.class)
.doOnNext(objectValue -> {
log.info("PostBody:{}", objectValue);
log.info(
"end-------------------------------------------------");
gatewayContext.setCacheBody(objectValue);
/* log.debug("[GatewayContext]Read JsonBody:{}",
objectValue);*/
}).then(chain.filter(mutatedExchange));
});
}
}import lombok.extern.slf4j.Slf4j;
import org.reactivestreams.Publisher;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.http.server.reactive.ServerHttpResponseDecorator;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import java.net.InetSocketAddress;
import java.net.URI;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.atomic.AtomicReference;
@Component
@Slf4j
public class LogResponseGlobalFilter implements GlobalFilter, Ordered {
private static final String REQUEST_PREFIX = "Request Info [ ";
private static final String REQUEST_TAIL = " ]";
private static final String RESPONSE_PREFIX = "Response Info [ ";
private static final String RESPONSE_TAIL = " ]";
private StringBuilder normalMsg = new StringBuilder();
@Override
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
ServerHttpRequest request = exchange.getRequest();
ServerHttpResponse response = exchange.getResponse();
DataBufferFactory bufferFactory = response.bufferFactory();
normalMsg.append(RESPONSE_PREFIX);
ServerHttpResponseDecorator decoratedResponse = new ServerHttpResponseDecorator(response) {
@Override
public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {
if (body instanceof Flux) {
Flux<? extends DataBuffer> fluxBody = (Flux<? extends DataBuffer>) body;
return super.writeWith(fluxBody.map(dataBuffer -> {
// probably should reuse buffers
byte[] content = new byte[dataBuffer.readableByteCount()];
dataBuffer.read(content);
String responseResult = new String(content, Charset.forName("UTF-8"));
normalMsg.append("status=").append(this.getStatusCode());
normalMsg.append(";header=").append(this.getHeaders());
normalMsg.append(";responseResult=").append(responseResult);
normalMsg.append(RESPONSE_TAIL);
log.info(normalMsg.toString());
return bufferFactory.wrap(content);
}));
}
return super.writeWith(body); // if body is not a flux. never got there.
}
};
return chain.filter(exchange.mutate().response(decoratedResponse).build());
}
@Override
public int getOrder() {
return -2;
}
}补充知识：Spring Cloud Gateway 2.x 打印 Log
场景
在服务网关层面,需要打印出用户每次的请求body和其他的参数,gateway使用的是Reactor响应式编程，和Zuul网关获取流的写法还有些不同，
不过基本的思路是一样的，都是在filter中读取body流，然后缓存回去，因为body流，框架默认只允许读取一次。
思路
1. 添加一个filter做一次请求的拦截
GatewayConfig.java
添加一个配置类,配置一个高优先级的filter,并且注入一个PayloadServerWebExchangeDecorator 对request和response做包装的类。
package com.demo.gateway2x.config;
import com.demo.gateway2x.decorator.PayloadServerWebExchangeDecorator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.web.server.WebFilter;
@Configuration
public class GatewayConfig {
@Bean
@Order(Ordered.HIGHEST_PRECEDENCE) //过滤器顺序
public WebFilter webFilter() {
return (exchange, chain) -> chain.filter(new PayloadServerWebExchangeDecorator(exchange));
}
}PayloadServerWebExchangeDecorator.java
这个类中，我们实现了框架的ServerWebExchangeDecorator类，同时注入了自定义的两个类,PartnerServerHttpRequestDecorator 和 PartnerServerHttpResponseDecorator ,
这两个类用于后面对请求与响应的拦截。
package com.demo.gateway2x.decorator;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.ServerWebExchangeDecorator;
public class PayloadServerWebExchangeDecorator extends ServerWebExchangeDecorator {
private PartnerServerHttpRequestDecorator requestDecorator;
private PartnerServerHttpResponseDecorator responseDecorator;
public PayloadServerWebExchangeDecorator(ServerWebExchange delegate) {
super(delegate);
requestDecorator = new PartnerServerHttpRequestDecorator(delegate.getRequest());
responseDecorator = new PartnerServerHttpResponseDecorator(delegate.getResponse());
}
@Override
public ServerHttpRequest getRequest() {
return requestDecorator;
}
@Override
public ServerHttpResponse getResponse() {
return responseDecorator;
}
}2. 在请求进入时,对request做一次拦截
PartnerServerHttpRequestDecorator.java
这个类实现了 ServerHttpRequestDecorator , 并在构造函数中，使用响应式编程，调用了打印log的方法，注意关注 Mono<DataBuffer> mono = DataBufferUtils.join(flux); ，
这里将Flux合并成了一个Mono，因为如果不这么做，body内容过多，将会被分段打印，这里是一个恒重要的点，
在打印RequestParamsHandle.chain打印过日志后，我们又返回了一个dataBuffer，用作向下传递，否则dataBuffer被读取过一次后就不能继续使用了。
package com.demo.gateway2x.decorator;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpRequestDecorator;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import static reactor.core.scheduler.Schedulers.single;
@Slf4j
public class PartnerServerHttpRequestDecorator extends ServerHttpRequestDecorator {
private Flux<DataBuffer> body;
public PartnerServerHttpRequestDecorator(ServerHttpRequest delegate) {
super(delegate);
Flux<DataBuffer> flux = super.getBody();
if (ParamsUtils.CHAIN_MEDIA_TYPE.contains(delegate.getHeaders().getContentType())) {
Mono<DataBuffer> mono = DataBufferUtils.join(flux);
body = mono.publishOn(single()).map(dataBuffer -> RequestParamsHandle.chain(delegate, log, dataBuffer)).flux();
} else {
body = flux;
}
}
@Override
public Flux<DataBuffer> getBody() {
return body;
}
}RequestParamsHandle.java
这个类主要用来读取dataBuffer并做了日志打印处理，也可以做一些其他的例如参数校验等使用。
package com.demo.gateway2x.decorator;
import com.alibaba.fastjson.JSON;
import org.slf4j.Logger;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.util.StringUtils;
import java.util.HashMap;
import java.util.Map;
public class RequestParamsHandle {
public static <T extends DataBuffer> T chain(ServerHttpRequest delegate, Logger log, T buffer) {
ParamsUtils.BodyDecorator bodyDecorator = ParamsUtils.buildBodyDecorator(buffer);
// 参数校验 和 参数打印
log.info("Payload: {}", JSON.toJSONString(validParams(getParams(delegate, bodyDecorator.getBody()))));
return (T) bodyDecorator.getDataBuffer();
}
public static Map<String,Object> getParams(ServerHttpRequest delegate, String body) {
// 整理参数
Map<String,Object> params = new HashMap<>();
if (delegate.getQueryParams() != null) {
params.putAll(delegate.getQueryParams());
}
if (!StringUtils.isEmpty(body)) {
params.putAll(JSON.parseObject(body));
}
return params;
}
public static Map<String,Object> validParams(Map<String,Object> params) {
// todo 参数校验
return params;
}
}3. 在结果返回时,对response做一次拦截
PartnerServerHttpResponseDecorator.java
这个类和上面的request的异曲同工，拦截响应流，并做记录入处理。
package com.demo.gateway2x.decorator;
import lombok.extern.slf4j.Slf4j;
import org.reactivestreams.Publisher;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.MediaType;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.http.server.reactive.ServerHttpResponseDecorator;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import static reactor.core.scheduler.Schedulers.single;
@Slf4j
public class PartnerServerHttpResponseDecorator extends ServerHttpResponseDecorator {
PartnerServerHttpResponseDecorator(ServerHttpResponse delegate) {
super(delegate);
}
@Override
public Mono<Void> writeAndFlushWith(Publisher<? extends Publisher<? extends DataBuffer>> body) {
return super.writeAndFlushWith(body);
}
@Override
public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {
final MediaType contentType = super.getHeaders().getContentType();
if (ParamsUtils.CHAIN_MEDIA_TYPE.contains(contentType)) {
if (body instanceof Mono) {
final Mono<DataBuffer> monoBody = (Mono<DataBuffer>) body;
return super.writeWith(monoBody.publishOn(single()).map(dataBuffer -> ResponseParamsHandle.chain(log, dataBuffer)));
} else if (body instanceof Flux) {
Mono<DataBuffer> mono = DataBufferUtils.join(body);
final Flux<DataBuffer> monoBody = mono.publishOn(single()).map(dataBuffer -> ResponseParamsHandle.chain(log, dataBuffer)).flux();
return super.writeWith(monoBody);
}
}
return super.writeWith(body);
}
}ResponseParamsHandle.java
响应流的日志打印
package com.demo.gateway2x.decorator;
import org.slf4j.Logger;
import org.springframework.core.io.buffer.DataBuffer;
public class ResponseParamsHandle {
public static <T extends DataBuffer> T chain(Logger log, T buffer) {
ParamsUtils.BodyDecorator bodyDecorator = ParamsUtils.buildBodyDecorator(buffer);
// 参数校验 和 参数打印
log.info("Payload: {}", bodyDecorator.getBody());
return (T) bodyDecorator.getDataBuffer();
}
}下面是实际操作，发送一次http请求：
控制台log结果：
总结
gateway和zuul打印参数的方式思路是一致的，只是gateway采用的是reactor，写法上与zuul的直接读取流有些不同，这里需要知道的是Flux需要转换为Mono这个地方，如果不转换容易分多批打印。
以上就是在Spring中使用 Cloud与Gateway怎么记录请求并应答数据日志，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注天达云行业资讯频道。