作为网关，日志记录是必不可少的功能，可以在网关出增加requestId来查询整个请求链的调用执行情况等等。

打印请求日志

打印请求日志最重要的就是打印请求参数这些东西，不过RequestBody通常情况下在被读取一次之后就会失效，这样的话，下游的服务就不能正常获取到请求参数了。所以我们需要重写下请求体。

具体方法呢有很多，这里说一下我用的两种：

第一种

代码如下：

package com.lifengdi.gateway.filter;

import com.lifengdi.gateway.constant.HeaderConstant;

import com.lifengdi.gateway.constant.OrderedConstant;

import com.lifengdi.gateway.log.Log;

import com.lifengdi.gateway.log.LogHelper;

import com.lifengdi.gateway.utils.GenerateIdUtils;

import com.lifengdi.gateway.utils.IpUtils;

import io.netty.buffer.UnpooledByteBufAllocator;

import lombok.extern.slf4j.Slf4j;

import org.apache.commons.lang.StringUtils;

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.NettyDataBufferFactory;

import org.springframework.http.HttpHeaders;

import org.springframework.http.MediaType;

import org.springframework.http.server.reactive.ServerHttpRequest;

import org.springframework.http.server.reactive.ServerHttpRequestDecorator;

import org.springframework.stereotype.Component;

import org.springframework.util.StopWatch;

import org.springframework.web.reactive.function.server.HandlerStrategies;

import org.springframework.web.reactive.function.server.ServerRequest;

import org.springframework.web.server.ServerWebExchange;

import reactor.core.publisher.Flux;

import reactor.core.publisher.Mono;

import java.net.URI;

import java.util.Objects;

import java.util.concurrent.atomic.AtomicBoolean;

import java.util.concurrent.atomic.AtomicReference;

import java.util.function.Consumer;

/**

 * 请求日志打印

 */

@Component

@Slf4j

public class RequestLogFilter implements GlobalFilter, Ordered {

    @Override

    public int getOrder() {

        return OrderedConstant.REQUEST_FILTER;

    }

    @Override

    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        StopWatch stopWatch = new StopWatch();

        stopWatch.start();

        long startTime = System.currentTimeMillis();

        try {

            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 (StringUtils.isBlank(headerRequestId)) {

                    httpHeaders.set(HeaderConstant.REQUEST_ID, requestId.get());

                } else {

                    requestId.set(headerRequestId);

                }

                httpHeaders.set(HeaderConstant.START_TIME_KEY, String.valueOf(startTime));

            };

            ServerRequest serverRequest = ServerRequest.create(exchange,

                    HandlerStrategies.withDefaults().messageReaders());

            URI requestUri = request.getURI();

            String uriQuery = requestUri.getQuery();

            String url = requestUri.getPath() + (StringUtils.isNotBlank(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 (Objects.nonNull(mediaType) && LogHelper.isUploadFile(mediaType)) {

                requestBody.set("上传文件");

            } else {

                if (method.equals("GET")) {

                    if (StringUtils.isNotBlank(uriQuery)) {

                        requestBody.set(uriQuery);

                    }

                } else {

                    newBody.set(true);

                }

            }

            final Log logDTO = new Log();

            logDTO.setLevel(Log.LEVEL.INFO);

            logDTO.setRequestUrl(url);

            logDTO.setRequestBody(requestBody.get());

            logDTO.setRequestMethod(method);

            logDTO.setRequestId(requestId.get());

            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);

        }

    }

}

上面的核心代码是：

// 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));

如果不需要对session进行操作，可以直接调用这块就行。

关于请求时间，我这里采用的是将时间戳放进请求头中，等到打印日志的时候再从请求头中读取然后计算出时间。否则如果单独在某个filter中计算请求时间，会造成时间不太准确。当然这样时间也不是很准确，毕竟还有Spring本身的filter等业务逻辑，不过时间相差不是很大，大概十几毫秒的样子。

第二种

第二种就是自己缓存下请求体，读取的时候读取缓存内容。

代码如下：

package com.lifengdi.gateway.log;

import com.lifengdi.gateway.constant.HeaderConstant;

import com.lifengdi.gateway.utils.IpUtils;

import io.netty.buffer.UnpooledByteBufAllocator;

import lombok.extern.slf4j.Slf4j;

import org.apache.commons.io.IOUtils;

import org.apache.commons.lang.StringUtils;

import org.springframework.core.io.buffer.DataBuffer;

import org.springframework.core.io.buffer.NettyDataBufferFactory;

import org.springframework.http.HttpHeaders;

import org.springframework.http.MediaType;

import org.springframework.http.server.reactive.ServerHttpRequest;

import org.springframework.http.server.reactive.ServerHttpRequestDecorator;

import reactor.core.publisher.Flux;

import reactor.core.scheduler.Schedulers;

import java.io.IOException;

import java.io.InputStream;

import java.net.URI;

import java.util.Objects;

/**

 * 对ServerHttpRequest进行二次封装，解决requestBody只能读取一次的问题

 * @author: Li Fengdi

 * @date: 2020-03-17 18:02

 */

@Slf4j

public class CacheServerHttpRequestDecorator extends ServerHttpRequestDecorator {

    private DataBuffer bodyDataBuffer;

    private int getBufferTime = 0;

    private byte[] bytes;

    public CacheServerHttpRequestDecorator(ServerHttpRequest delegate) {

        super(delegate);

    }

    @Override

    public Flux<DataBuffer> getBody() {

        if (getBufferTime == 0) {

            getBufferTime++;

            Flux<DataBuffer> flux = super.getBody();

            return flux.publishOn(Schedulers.single())

                    .map(this::cache)

                    .doOnComplete(() -> trace(getDelegate()));

        } else {

            return Flux.just(getBodyMore());

        }

    }

    private DataBuffer getBodyMore() {

        NettyDataBufferFactory nettyDataBufferFactory = new NettyDataBufferFactory(new UnpooledByteBufAllocator(false));

        bodyDataBuffer = nettyDataBufferFactory.wrap(bytes);

        return bodyDataBuffer;

    }

    private DataBuffer cache(DataBuffer buffer) {

        try {

            InputStream dataBuffer = buffer.asInputStream();

            bytes = IOUtils.toByteArray(dataBuffer);

            NettyDataBufferFactory nettyDataBufferFactory = new NettyDataBufferFactory(new UnpooledByteBufAllocator(false));

            bodyDataBuffer = nettyDataBufferFactory.wrap(bytes);

            return bodyDataBuffer;

        } catch (IOException e) {

            e.printStackTrace();

        }

        return null;

    }

    private void trace(ServerHttpRequest request) {

        URI requestUri = request.getURI();

        String uriQuery = requestUri.getQuery();

        String url = requestUri.getPath() + (StringUtils.isNotBlank(uriQuery) ? "?" + uriQuery : "");

        HttpHeaders headers = request.getHeaders();

        MediaType mediaType = headers.getContentType();

        String schema = requestUri.getScheme();

        String method = request.getMethodValue().toUpperCase();

        if ((!"http".equals(schema) && !"https".equals(schema))) {

            return;

        }

        String reqBody = null;

        if (Objects.nonNull(mediaType) && LogHelper.isUploadFile(mediaType)) {

            reqBody = "上传文件";

        } else {

            if (method.equals("GET")) {

                if (StringUtils.isNotBlank(uriQuery)) {

                    reqBody = uriQuery;

                }

            } else if (headers.getContentLength() > 0) {

                reqBody = LogHelper.readRequestBody(request);

            }

        }

        final Log logDTO = new Log();

        logDTO.setLevel(Log.LEVEL.INFO);

        logDTO.setRequestUrl(url);

        logDTO.setRequestBody(reqBody);

        logDTO.setRequestMethod(method);

        logDTO.setRequestId(headers.getFirst(HeaderConstant.REQUEST_ID));

        logDTO.setIp(IpUtils.getClientIp(request));

        log.info(LogHelper.toJsonString(logDTO));

    }

}

filter这里就简单写下：

package com.lifengdi.gateway.filter;

import com.lifengdi.gateway.constant.OrderedConstant;

import com.lifengdi.gateway.log.CacheServerHttpRequestDecorator;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;

import org.springframework.cloud.gateway.filter.GlobalFilter;

import org.springframework.core.Ordered;

import org.springframework.web.server.ServerWebExchange;

import reactor.core.publisher.Mono;

/**

 * @author: Li Fengdi

 * @date: 2020-03-17 18:17

 */

//@Component

public class LogFilter implements GlobalFilter, Ordered {

    @Override

    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        CacheServerHttpRequestDecorator cacheServerHttpRequestDecorator = new CacheServerHttpRequestDecorator(exchange.getRequest());

        return chain.filter(exchange.mutate().request(cacheServerHttpRequestDecorator).build());

    }

    @Override

    public int getOrder() {

        return OrderedConstant.LOGGING_FILTER;

    }

}

工具类也贴下：

package com.lifengdi.gateway.log;

import com.fasterxml.jackson.core.JsonProcessingException;

import com.fasterxml.jackson.databind.ObjectMapper;

import com.lifengdi.gateway.constant.HeaderConstant;

import lombok.extern.slf4j.Slf4j;

import org.apache.commons.lang.StringUtils;

import org.springframework.core.io.buffer.DataBufferUtils;

import org.springframework.http.HttpHeaders;

import org.springframework.http.MediaType;

import org.springframework.http.server.reactive.ServerHttpRequest;

import org.springframework.lang.NonNull;

import org.springframework.lang.Nullable;

import reactor.core.publisher.Mono;

import java.nio.charset.Charset;

import java.nio.charset.StandardCharsets;

import java.util.Objects;

import java.util.concurrent.atomic.AtomicReference;

@Slf4j

public class LogHelper {

    private final static ObjectMapper objectMapper = new ObjectMapper();

    /**

     * Log转JSON

     * @param dto Log

     * @return JSON字符串

     */

    public static String toJsonString(@NonNull Log dto) {

        try {

            return objectMapper.writeValueAsString(dto);

        } catch (JsonProcessingException e) {

            log.error("Log转换JSON异常", e);

            return null;

        }

    }

    /**

     * 根据MediaType获取字符集，如果获取不到，则默认返回<tt>UTF_8</tt>

     * @param mediaType MediaType

     * @return Charset

     */

    public static Charset getMediaTypeCharset(@Nullable MediaType mediaType) {

        if (Objects.nonNull(mediaType) && mediaType.getCharset() != null) {

            return mediaType.getCharset();

        } else {

            return StandardCharsets.UTF_8;

        }

    }

    /**

     * 记录日志（后期可扩展为通过MQ将日志发送到ELK系统）

     * @param dto Log

     * @return Mono.empty()

     */

    public static Mono<Void> doRecord(Log dto) {

        log.info(toJsonString(dto));

        return Mono.empty();

    }

    /**

     * 从HttpHeaders获取请求开始时间

     * <p>

     *     要求请求头中必须要有参数{@link HeaderConstant#START_TIME_KEY}，否则将返回当前时间戳

     * </p>

     * @param headers HttpHeaders请求头

     * @return 开始时间时间戳（Mills）

     */

    public static long getStartTime(HttpHeaders headers) {

        String startTimeStr = headers.getFirst(HeaderConstant.START_TIME_KEY);

        return StringUtils.isNotBlank(startTimeStr) ? Long.parseLong(startTimeStr) : System.currentTimeMillis();

    }

    /**

     * 根据HttpHeaders请求头获取请求执行时间

     * <p>

     *     要求请求头中必须要有参数{@link HeaderConstant#START_TIME_KEY}

     * </p>

     * @param headers HttpHeaders请求头

     * @return 请求执行时间

     */

    public static long getHandleTime(HttpHeaders headers) {

        String startTimeStr = headers.getFirst(HeaderConstant.START_TIME_KEY);

        long startTime = StringUtils.isNotBlank(startTimeStr) ? Long.parseLong(startTimeStr) : System.currentTimeMillis();

        return System.currentTimeMillis() - startTime;

    }

    /**

     * 读取请求体内容

     * @param request ServerHttpRequest

     * @return 请求体

     */

    public static String readRequestBody(ServerHttpRequest request) {

        HttpHeaders headers = request.getHeaders();

        MediaType mediaType = headers.getContentType();

        String method = request.getMethodValue().toUpperCase();

        if (Objects.nonNull(mediaType) && mediaType.equals(MediaType.MULTIPART_FORM_DATA)) {

            return "上传文件";

        } else {

            if (method.equals("GET")) {

                if (!request.getQueryParams().isEmpty()) {

                    return request.getQueryParams().toString();

                }

                return null;

            } else {

                AtomicReference<String> bodyString = new AtomicReference<>();

                request.getBody().subscribe(buffer -> {

                    byte[] bytes = new byte[buffer.readableByteCount()];

                    buffer.read(bytes);

                    DataBufferUtils.release(buffer);

                    bodyString.set(new String(bytes, getMediaTypeCharset(mediaType)));

                });

                return bodyString.get();

            }

        }

    }

    /**

     * 判断是否是上传文件

     * @param mediaType MediaType

     * @return Boolean

     */

    public static boolean isUploadFile(@Nullable MediaType mediaType) {

        if (Objects.isNull(mediaType)) {

            return false;

        }

        return mediaType.equals(MediaType.MULTIPART_FORM_DATA)

                || mediaType.equals(MediaType.IMAGE_GIF)

                || mediaType.equals(MediaType.IMAGE_JPEG)

                || mediaType.equals(MediaType.IMAGE_PNG)

                || mediaType.equals(MediaType.MULTIPART_MIXED);

    }

}

打印响应报文

响应报文需要在Spring重写了响应体之后才能获取到，所以对filter的执行顺序有要求，需要在

NettyWriteResponseFilter.WRITE_RESPONSE_FILTER_ORDER之前执行。代码如下：

package com.lifengdi.gateway.filter;

import com.lifengdi.gateway.constant.HeaderConstant;

import com.lifengdi.gateway.constant.OrderedConstant;

import com.lifengdi.gateway.log.Log;

import com.lifengdi.gateway.log.LogHelper;

import com.lifengdi.gateway.utils.IpUtils;

import io.netty.buffer.UnpooledByteBufAllocator;

import lombok.extern.slf4j.Slf4j;

import org.apache.commons.lang.StringUtils;

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.core.io.buffer.DataBufferUtils;

import org.springframework.core.io.buffer.NettyDataBufferFactory;

import org.springframework.http.HttpHeaders;

import org.springframework.http.HttpStatus;

import org.springframework.http.MediaType;

import org.springframework.http.server.reactive.ServerHttpRequest;

import org.springframework.http.server.reactive.ServerHttpRequestDecorator;

import org.springframework.http.server.reactive.ServerHttpResponse;

import org.springframework.http.server.reactive.ServerHttpResponseDecorator;

import org.springframework.stereotype.Component;

import org.springframework.web.reactive.function.server.HandlerStrategies;

import org.springframework.web.reactive.function.server.ServerRequest;

import org.springframework.web.server.ServerWebExchange;

import reactor.core.publisher.Flux;

import reactor.core.publisher.Mono;

import java.net.URI;

import java.nio.charset.Charset;

import java.util.Objects;

import java.util.concurrent.atomic.AtomicReference;

/**

 * 请求响应日志打印

 */

@Component

@Slf4j

public class ResponseLogFilter implements GlobalFilter, Ordered {

    @Override

    public int getOrder() {

        return OrderedConstant.LOGGING_FILTER;

    }

    @Override

    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        try {

            ServerHttpRequest request = exchange.getRequest();

            ServerRequest serverRequest = ServerRequest.create(exchange,

                    HandlerStrategies.withDefaults().messageReaders());

            URI requestUri = request.getURI();

            String uriQuery = requestUri.getQuery();

            HttpHeaders headers = request.getHeaders();

            MediaType mediaType = headers.getContentType();

            String schema = requestUri.getScheme();

            String method = request.getMethodValue().toUpperCase();

            // 只记录http、https请求

            if ((!"http".equals(schema) && !"https".equals(schema))) {

                return chain.filter(exchange);

            }

            final AtomicReference<String> requestBody = new AtomicReference<>();// 原始请求体

            // 排除流文件类型,比如上传的文件contentType.contains("multipart/form-data")

            if (Objects.nonNull(mediaType) && LogHelper.isUploadFile(mediaType)) {

                requestBody.set("上传文件");

                return chain.filter(exchange);

            } else {

                if (method.equals("GET")) {

                    if (StringUtils.isNotBlank(uriQuery)) {

                        requestBody.set(uriQuery);

                    }

                } else if (headers.getContentLength() > 0){

                    return serverRequest.bodyToMono(String.class).flatMap(reqBody -> {

                        requestBody.set(reqBody);

                        // 重写原始请求

                        ServerHttpRequestDecorator requestDecorator = new ServerHttpRequestDecorator(exchange.getRequest()) {

                            @Override

                            public HttpHeaders getHeaders() {

                                HttpHeaders httpHeaders = new HttpHeaders();

                                httpHeaders.putAll(super.getHeaders());

                                return httpHeaders;

                            }

                            @Override

                            public Flux<DataBuffer> getBody() {

                                NettyDataBufferFactory nettyDataBufferFactory = new NettyDataBufferFactory(new UnpooledByteBufAllocator(false));

                                DataBuffer bodyDataBuffer = nettyDataBufferFactory.wrap(reqBody.getBytes());

                                return Flux.just(bodyDataBuffer);

//                                return Flux.just(reqBody).map(bx -> exchange.getRequest().bufferFactory().wrap(bx.getBytes()));

                            }

                        };

                        ServerHttpResponseDecorator responseDecorator = getServerHttpResponseDecorator(exchange,

                                requestBody);

                        return chain.filter(exchange.mutate()

                                .request(requestDecorator)

                                .response(responseDecorator)

                                .build());

                    });

                }

                ServerHttpResponseDecorator decoratedResponse = getServerHttpResponseDecorator(exchange,

                        requestBody);

                return chain.filter(exchange.mutate()

                        .response(decoratedResponse)

                        .build());

            }

        } catch (Exception e) {

            log.error("请求响应日志打印出现异常", e);

            return chain.filter(exchange);

        }

    }

    private ServerHttpResponseDecorator getServerHttpResponseDecorator(ServerWebExchange exchange,

                                                                       AtomicReference<String> requestBody) {

        // 获取response的返回数据

        ServerHttpResponse originalResponse = exchange.getResponse();

        DataBufferFactory bufferFactory = originalResponse.bufferFactory();

        HttpStatus httpStatus = originalResponse.getStatusCode();

        ServerHttpRequest request = exchange.getRequest();

        URI requestUri = request.getURI();

        String uriQuery = requestUri.getQuery();

        String url = requestUri.getPath() + (StringUtils.isNotBlank(uriQuery) ? "?" + uriQuery : "");

        HttpHeaders headers = request.getHeaders();

        String method = request.getMethodValue().toUpperCase();

        String requestId = headers.getFirst(HeaderConstant.REQUEST_ID);

        // 封装返回体

        return new ServerHttpResponseDecorator(originalResponse) {

            @Override

            public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {

                if (body instanceof Flux) {

                    Flux<? extends DataBuffer> fluxBody = Flux.from(body);

                    return super.writeWith(fluxBody.buffer().map(dataBuffers -> {

                        DataBuffer join = bufferFactory.join(dataBuffers);

                        byte[] content = new byte[join.readableByteCount()];

                        join.read(content);

                        DataBufferUtils.release(join);

                        Charset charset = LogHelper.getMediaTypeCharset(originalResponse.getHeaders().getContentType());

                        String responseBody = new String(content, charset);

                        long handleTime = LogHelper.getHandleTime(headers);

                        Log logDTO = new Log(Log.TYPE.RESPONSE);

                        logDTO.setLevel(Log.LEVEL.INFO);

                        logDTO.setRequestUrl(url);

                        logDTO.setRequestBody(requestBody.get());

                        logDTO.setResponseBody(responseBody);

                        logDTO.setRequestMethod(method);

                        if (Objects.nonNull(httpStatus)) {

                            logDTO.setStatus(httpStatus.value());

                        }

                        logDTO.setHandleTime(handleTime);

                        logDTO.setRequestId(requestId);

                        logDTO.setIp(IpUtils.getClientIp(request));

                        exchange.getSession().subscribe(webSession -> {

                            logDTO.setSessionId(webSession.getId());

                        });

                        log.info("url:{},method:{},请求内容:{},响应内容:{},status:{},handleTime:{},requestId:{}",

                                url, method, requestBody.get(), responseBody, httpStatus,

                                handleTime, requestId);

                        log.info(LogHelper.toJsonString(logDTO));

                        return bufferFactory.wrap(content);

                    }));

                }

                return super.writeWith(body);

            }

        };

    }

}

代码已上传到git上，需要的可以去看看。

git代码地址：https://github.com/lifengdi/spring-cloud-gateway-demo

原文地址：https://www.lifengdi.com/archives/article/1778

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从零搭建Spring Cloud Gateway网关（二）—— 打印请求响应日志

打印请求日志

第一种

第二种

打印响应报文

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