gateway、webflux、reactor-netty请求日志输出方式代码示例

本篇文章小编给大家分享一下java数组与以逗号分隔开的字符串相互转换代码，文章代码介绍的很详细，小编觉得挺不错的，现在分享给大家供大家参考，有需要的小伙伴们可以来看看。

gateway、webflux、reactor-netty请求日志输出

场景

在使用spring cloud gateway时想要输出请求日志，考虑到两种实现方案

方案一

官网中使用Reactor Netty Access Logs方案，配置“-Dreactor.netty.http.server.accessLogEnabled=true”开启日志记录。

输出如下：

reactor.netty.http.server.AccessLog      :
10.2.20.177 - - [02/Dec/2020:16:41:57 +0800] "GET /fapi/gw/hi/login HTTP/1.1" 200 319 8080 626 ms

优点:简单方便

缺点:格式固定，信息量少

方案二

创建一个logfilter，在logfilter中解析request，并输出请求信息

优点:可以自定义日志格式和内容,可以获取body信息

缺点:返回信息需要再写一个filter,没有匹配到路由时无法进入到logfilter中

思路

对方案一进行改造，使其满足需求。对reactor-netty源码分析，主要涉及

AccessLog：日志工具，日志结构体

AccessLogHandler：http1.1协议日志控制，我们主要使用这个。

AccessLogHandler2：http2协议日志控制

代码如下：

package reactor.netty.http.server; 
import reactor.util.Logger;
import reactor.util.Loggers;
 
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
import java.util.Objects;
 
final class AccessLog {
    static final Logger log = Loggers.getLogger("reactor.netty.http.server.AccessLog");
    static final DateTimeFormatter DATE_TIME_FORMATTER =
            DateTimeFormatter.ofPattern("dd/MMM/yyyy:HH:mm:ss Z", Locale.US);
    static final String COMMON_LOG_FORMAT =
            "{} - {} [{}] "{} {} {}" {} {} {} {} ms";
    static final String MISSING = "-"; 
    final String zonedDateTime;
 
    String address;
    CharSequence method;
    CharSequence uri;
    String protocol;
    String user = MISSING;
    CharSequence status;
    long contentLength;
    boolean chunked;
    long startTime = System.currentTimeMillis();
    int port;
 
    AccessLog() {
        this.zonedDateTime = ZonedDateTime.now().format(DATE_TIME_FORMATTER);
    }
 
    AccessLog address(String address) {
        this.address = Objects.requireNonNull(address, "address");
        return this;
    }
 
    AccessLog port(int port) {
        this.port = port;
        return this;
    }
 
    AccessLog method(CharSequence method) {
        this.method = Objects.requireNonNull(method, "method");
        return this;
    }
 
    AccessLog uri(CharSequence uri) {
        this.uri = Objects.requireNonNull(uri, "uri");
        return this;
    }
 
    AccessLog protocol(String protocol) {
        this.protocol = Objects.requireNonNull(protocol, "protocol");
        return this;
    }
 
    AccessLog status(CharSequence status) {
        this.status = Objects.requireNonNull(status, "status");
        return this;
    }
 
    AccessLog contentLength(long contentLength) {
        this.contentLength = contentLength;
        return this;
    }
 
    AccessLog increaseContentLength(long contentLength) {
        if (chunked) {
            this.contentLength += contentLength;
        }
        return this;
    }
 
    AccessLog chunked(boolean chunked) {
        this.chunked = chunked;
        return this;
    }
 
    long duration() {
        return System.currentTimeMillis() - startTime;
    }
 
    void log() {
        if (log.isInfoEnabled()) {
            log.info(COMMON_LOG_FORMAT, address, user, zonedDateTime,
                    method, uri, protocol, status, (contentLength > -1 ? contentLength : MISSING), port, duration());
        }
    }
}

AccessLogHandler：日志控制

package reactor.netty.http.server; 
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufHolder;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpUtil;
import io.netty.handler.codec.http.LastHttpContent;
 
/**
 * @author Violeta Georgieva
 */
final class AccessLogHandler extends ChannelDuplexHandler {
 
    AccessLog accessLog = new AccessLog();
 
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        if (msg instanceof HttpRequest) {
            final HttpRequest request = (HttpRequest) msg;
            final SocketChannel channel = (SocketChannel) ctx.channel();
 
            accessLog = new AccessLog()
                    .address(channel.remoteAddress().getHostString())
                    .port(channel.localAddress().getPort())
                    .method(request.method().name())
                    .uri(request.uri())
                    .protocol(request.protocolVersion().text());
        }
        ctx.fireChannelRead(msg);
    }
 
    @Override
    @SuppressWarnings("FutureReturnValueIgnored")
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
        if (msg instanceof HttpResponse) {
            final HttpResponse response = (HttpResponse) msg;
            final HttpResponseStatus status = response.status();
 
            if (status.equals(HttpResponseStatus.CONTINUE)) {
                //"FutureReturnValueIgnored" this is deliberate
                ctx.write(msg, promise);
                return;
            }
 
            final boolean chunked = HttpUtil.isTransferEncodingChunked(response);
            accessLog.status(status.codeAsText())
                     .chunked(chunked);
            if (!chunked) {
                accessLog.contentLength(HttpUtil.getContentLength(response, -1));
            }
        }
        if (msg instanceof LastHttpContent) {
            accessLog.increaseContentLength(((LastHttpContent) msg).content().readableBytes());
            ctx.write(msg, promise.unvoid())
               .addListener(future -> {
                   if (future.isSuccess()) {
                       accessLog.log();
                   }
               });
            return;
        }
        if (msg instanceof ByteBuf) {
            accessLog.increaseContentLength(((ByteBuf) msg).readableBytes());
        }
        if (msg instanceof ByteBufHolder) {
            accessLog.increaseContentLength(((ByteBufHolder) msg).content().readableBytes());
        }
        //"FutureReturnValueIgnored" this is deliberate
        ctx.write(msg, promise);
    }
}

执行顺序

AccessLogHandler.channelRead > GlobalFilter.filter > AbstractLoadBalance.choose >response.writeWith >AccessLogHandler.write

解决方案

对AccessLog和AccessLogHandler进行重写，输出自己想要的内容和样式。

AccessLogHandler中重写了ChannelDuplexHandler中的channelRead和write方法，还可以对ChannelInboundHandler和ChannelOutboundHandler中的方法进行重写，覆盖请求的整个生命周期。

spring-webflux、gateway、springboot-start-web问题

Spring-webflux

当两者一起时配置的并不是webflux web application, 仍然时一个spring mvc web application。

官方文档中有这么一段注解：

很多开发者添加spring-boot-start-webflux到他们的spring mvc web applicaiton去是为了使用reactive WebClient. 如果希望更改webApplication 类型需要显示的设置，如SpringApplication.setWebApplicationType(WebApplicationType.REACTIVE).

    
        org.springframework.boot
        spring-boot-starter-webflux
    
    
        org.springframework.boot
        spring-boot-starter-web
    

结论一：

当两者一起时配置的并不是webflux web application, 仍然时一个spring mvc web application。但是启动不会报错，可以正常使用，但是webflux功能失效

Spring-gateway

因为gateway和zuul不一样，gateway用的是长连接，netty-webflux，zuul1.0用的就是同步webmvc。

所以你的非gateway子项目启动用的是webmvc，你的gateway启动用的是webflux. spring-boot-start-web和spring-boot-start-webflux相见分外眼红。

不能配置在同一pom.xml，或者不能在同一项目中出现，不然就会启动报错

    
        org.springframework.cloud
        spring-cloud-starter-gateway
    

结论二：

当spring-cloud-gateway和spring-boot-starer-web两者一起时配置的时候, 启动直接报错，依赖包冲突不兼容