SpringCloud升级之路2020.0.x版-42.SpringCloudGateway 现有的可供分析的请求日志以及缺陷

本系列代码地址：https://github.com/JoJoTec/spring-cloud-parent

网关由于是所有外部用户请求的入口，记录这些请求中我们需要的元素，对于线上监控以及业务问题定位，是非常重要的。并且，在这些元素中，链路信息也是非常重要的。通过链路信息，我们可以找到请求调用全链路相关的日志。并且，网关也是大部分请求链路起始的地方，记录请求中的元素的同时，也要带上链路信息。

我们需要在网关记录每个请求的：

• HTTP 相关元素：URL 相关信息
• 请求信息，例如 HTTP HEADER，请求时间等等
• 某些类型的请求体
• 响应信息，例如响应码
• 某些类型响应的响应体

现有的可供分析的日志以及缺陷

首先我们来看 Spring Cloud Gateway 中本身我们可以利用的日志。Spring Cloud Gateway 基于 Spring-WebFlux，Spring-WebFlux 基于 Project Reactor，我们没有在网关加入额外的 Web 容器依赖，所以 Web 容器用的是默认的基于 Project Reactor 的 reactor-netty 实现的 Web 容器。

netty 抓包日志

使用了 netty 我们可以联想到 netty 的抓包日志，Spring Cloud Gateway 封装了这个功能，并暴露了配置。Spring Cloud Gateway 是一个网关，他会作为 HTTP 服务器接受 HTTP 请求的同时，还在作为 HTTP 客户端将请求转发到下游的微服务。所以，这里有两种抓包日志，一种是作为 HTTP 服务器接收到的请求和响应，另一种是做为 HTTP 客户端发出的请求和响应。分别对应两个配置：

spring.cloud.gateway:httpserver:wiretap: truehttpclient:wiretap: true

经常有读者私信我问如何看 spring cloud 有哪些配置，官方文档感觉不够清楚全面。我一般是看源码，但是鉴于很多人没有精力去研究源码，一种偷懒的方式是去看 jar 包里面的

spring-configuration-metadata.json

。里面包含了比较全的配置，以及配置类（如果存在的话），这是很方便的。例如我们这里的两个配置，在这个 json 中对应：

{"name": "spring.cloud.gateway.httpclient.wiretap","type": "java.lang.Boolean","description": "Enables wiretap debugging for Netty HttpClient.","sourceType": "org.springframework.cloud.gateway.config.HttpClientProperties","defaultValue": false},{"name": "spring.cloud.gateway.httpserver.wiretap","type": "java.lang.Boolean","description": "Enables wiretap debugging for Netty HttpServer.","defaultValue": "false"},

可以看出，

spring.cloud.gateway.httpclient.wiretap

对应配置类

org.springframework.cloud.gateway.config.HttpClientProperties

（这个配置类里面的配置我们后面还会用到，到时候会详细分析其中的配置项），默认为 false。

spring.cloud.gateway.httpserver.wiretap

没有配置类，他是被直接使用的，对应源码：

GatewayAutoConfiguration.java

@Bean@ConditionalOnProperty(name = "spring.cloud.gateway.httpserver.wiretap")public NettyWebServerFactoryCustomizer nettyServerWiretapCustomizer(Environment environment,ServerProperties serverProperties) {return new NettyWebServerFactoryCustomizer(environment, serverProperties) {@Overridepublic void customize(NettyReactiveWebServerFactory factory) {factory.addServerCustomizers(httpServer -> httpServer.wiretap(true));super.customize(factory);}};}

增加这两个配置为 true 之后，增加日志输出配置，我这里使用的是 log4j2（其实就是设置

reactor.netty.http.server.HttpServer

和

reactor.netty.http.server.HttpClient

的日志级别为 DEBUG）：

<AsyncLogger name="reactor.netty.http.server.HttpServer" level="debug" additivity="false" includeLocation="true"><appender-ref ref="console" /></AsyncLogger><AsyncLogger name="reactor.netty.http.client.HttpClient" level="debug" additivity="false" includeLocation="true"><appender-ref ref="console" /></AsyncLogger>

然后，再次请求我们前面实现的网关，可以看到类似于下面的日志：

2021-11-27 01:16:06,262 DEBUG [sports,,] [10632] [reactor-http-nio-2][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:1277d54e, L:/127.0.0.1:8181 - R:/127.0.0.1:52797] READ: 466B+-------------------------------------------------+|  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |+--------+-------------------------------------------------+----------------+|00000000| 47 45 54 20 2f 74 65 73 74 2d 73 73 2f 61 6e 79 |GET /test-ss/any||00000010| 74 68 69 6e 67 20 48 54 54 50 2f 31 2e 31 0d 0a |thing HTTP/1.1..||00000020| 48 6f 73 74 3a 20 31 32 37 2e 30 2e 30 2e 31 3a |Host: 127.0.0.1:||00000030| 38 31 38 31 0d 0a 43 6f 6e 6e 65 63 74 69 6f 6e |8181..Connection||00000040| 3a 20 6b 65 65 70 2d 61 6c 69 76 65 0d 0a 43 61 |: keep-alive..Ca||00000050| 63 68 65 2d 43 6f 6e 74 72 6f 6c 3a 20 6d 61 78 |che-Control: max||00000060| 2d 61 67 65 3d 30 0d 0a 55 70 67 72 61 64 65 2d |-age=0..Upgrade-||00000070| 49 6e 73 65 63 75 72 65 2d 52 65 71 75 65 73 74 |Insecure-Request||00000080| 73 3a 20 31 0d 0a 55 73 65 72 2d 41 67 65 6e 74 |s: 1..User-Agent||00000090| 3a 20 4d 6f 7a 69 6c 6c 61 2f 35 2e 30 20 28 57 |: Mozilla/5.0 (W||000000a0| 69 6e 64 6f 77 73 20 4e 54 20 31 30 2e 30 3b 20 |indows NT 10.0; ||000000b0| 57 4f 57 36 34 29 20 41 70 70 6c 65 57 65 62 4b |WOW64) AppleWebK||000000c0| 69 74 2f 35 33 37 2e 33 36 20 28 4b 48 54 4d 4c |it/537.36 (KHTML||000000d0| 2c 20 6c 69 6b 65 20 47 65 63 6b 6f 29 20 43 68 |, like Gecko) Ch||000000e0| 72 6f 6d 65 2f 37 30 2e 30 2e 33 35 33 38 2e 32 |rome/70.0.3538.2||000000f0| 35 20 53 61 66 61 72 69 2f 35 33 37 2e 33 36 20 |5 Safari/537.36 ||00000100| 43 6f 72 65 2f 31 2e 37 30 2e 33 38 37 39 2e 34 |Core/1.70.3879.4||00000110| 30 30 20 51 51 42 72 6f 77 73 65 72 2f 31 30 2e |00 QQBrowser/10.||00000120| 38 2e 34 35 35 32 2e 34 30 30 0d 0a 41 63 63 65 |8.4552.400..Acce||00000130| 70 74 3a 20 74 65 78 74 2f 68 74 6d 6c 2c 61 70 |pt: text/html,ap||00000140| 70 6c 69 63 61 74 69 6f 6e 2f 78 68 74 6d 6c 2b |plication/xhtml+||00000150| 78 6d 6c 2c 61 70 70 6c 69 63 61 74 69 6f 6e 2f |xml,application/||00000160| 78 6d 6c 3b 71 3d 30 2e 39 2c 69 6d 61 67 65 2f |xml;q=0.9,image/||00000170| 77 65 62 70 2c 69 6d 61 67 65 2f 61 70 6e 67 2c |webp,image/apng,||00000180| 2a 2f 2a 3b 71 3d 30 2e 38 0d 0a 41 63 63 65 70 |*/*;q=0.8..Accep||00000190| 74 2d 45 6e 63 6f 64 69 6e 67 3a 20 67 7a 69 70 |t-Encoding: gzip||000001a0| 2c 20 64 65 66 6c 61 74 65 2c 20 62 72 0d 0a 41 |, deflate, br..A||000001b0| 63 63 65 70 74 2d 4c 61 6e 67 75 61 67 65 3a 20 |ccept-Language: ||000001c0| 7a 68 2d 43 4e 2c 7a 68 3b 71 3d 30 2e 39 0d 0a |zh-CN,zh;q=0.9..||000001d0| 0d 0a                                           |..              |+--------+-------------------------------------------------+----------------+2021-11-27 01:16:06,262 DEBUG [sports,,] [10632] [reactor-http-nio-2][reactor.util.Loggers$Slf4JLogger:249]:[id:1277d54e-2, L:/127.0.0.1:8181 - R:/127.0.0.1:52797] Handler is being applied: org.springframework.http.server.reactive.ReactorHttpHandlerAdapter@317ee5cc2021-11-27 01:16:06,378 DEBUG [sports,,] [10632] [reactor-http-nio-2][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:1277d54e-2, L:/127.0.0.1:8181 - R:/127.0.0.1:52797] READ COMPLETE2021-11-27 01:16:06,381 DEBUG [sports,,] [10632] [reactor-http-nio-6][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:6666c1d1] REGISTERED2021-11-27 01:16:06,437 DEBUG [sports,,] [10632] [reactor-http-nio-6][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:6666c1d1] CONNECT: httpbin.org/18.232.227.86:802021-11-27 01:16:06,656 DEBUG [sports,,] [10632] [reactor-http-nio-6][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:6666c1d1, L:/172.168.160.198:52819 - R:httpbin.org/18.232.227.86:80] ACTIVE2021-11-27 01:16:06,672 DEBUG [sports,,] [10632] [reactor-http-nio-6][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:6666c1d1-1, L:/172.168.160.198:52819 - R:httpbin.org/18.232.227.86:80] WRITE: 775B+-------------------------------------------------+|  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |+--------+-------------------------------------------------+----------------+|00000000| 47 45 54 20 2f 61 6e 79 74 68 69 6e 67 20 48 54 |GET /anything HT||00000010| 54 50 2f 31 2e 31 0d 0a 43 61 63 68 65 2d 43 6f |TP/1.1..Cache-Co||00000020| 6e 74 72 6f 6c 3a 20 6d 61 78 2d 61 67 65 3d 30 |ntrol: max-age=0||00000030| 0d 0a 55 70 67 72 61 64 65 2d 49 6e 73 65 63 75 |..Upgrade-Insecu||00000040| 72 65 2d 52 65 71 75 65 73 74 73 3a 20 31 0d 0a |re-Requests: 1..||00000050| 55 73 65 72 2d 41 67 65 6e 74 3a 20 4d 6f 7a 69 |User-Agent: Mozi||00000060| 6c 6c 61 2f 35 2e 30 20 28 57 69 6e 64 6f 77 73 |lla/5.0 (Windows||00000070| 20 4e 54 20 31 30 2e 30 3b 20 57 4f 57 36 34 29 | NT 10.0; WOW64)||00000080| 20 41 70 70 6c 65 57 65 62 4b 69 74 2f 35 33 37 | AppleWebKit/537||00000090| 2e 33 36 20 28 4b 48 54 4d 4c 2c 20 6c 69 6b 65 |.36 (KHTML, like||000000a0| 20 47 65 63 6b 6f 29 20 43 68 72 6f 6d 65 2f 37 | Gecko) Chrome/7||000000b0| 30 2e 30 2e 33 35 33 38 2e 32 35 20 53 61 66 61 |0.0.3538.25 Safa||000000c0| 72 69 2f 35 33 37 2e 33 36 20 43 6f 72 65 2f 31 |ri/537.36 Core/1||000000d0| 2e 37 30 2e 33 38 37 39 2e 34 30 30 20 51 51 42 |.70.3879.400 QQB||000000e0| 72 6f 77 73 65 72 2f 31 30 2e 38 2e 34 35 35 32 |rowser/10.8.4552||000000f0| 2e 34 30 30 0d 0a 41 63 63 65 70 74 3a 20 74 65 |.400..Accept: te||00000100| 78 74 2f 68 74 6d 6c 2c 61 70 70 6c 69 63 61 74 |xt/html,applicat||00000110| 69 6f 6e 2f 78 68 74 6d 6c 2b 78 6d 6c 2c 61 70 |ion/xhtml+xml,ap||00000120| 70 6c 69 63 61 74 69 6f 6e 2f 78 6d 6c 3b 71 3d |plication/xml;q=||00000130| 30 2e 39 2c 69 6d 61 67 65 2f 77 65 62 70 2c 69 |0.9,image/webp,i||00000140| 6d 61 67 65 2f 61 70 6e 67 2c 2a 2f 2a 3b 71 3d |mage/apng,*/*;q=||00000150| 30 2e 38 0d 0a 41 63 63 65 70 74 2d 45 6e 63 6f |0.8..Accept-Enco||00000160| 64 69 6e 67 3a 20 67 7a 69 70 2c 20 64 65 66 6c |ding: gzip, defl||00000170| 61 74 65 2c 20 62 72 0d 0a 41 63 63 65 70 74 2d |ate, br..Accept-||00000180| 4c 61 6e 67 75 61 67 65 3a 20 7a 68 2d 43 4e 2c |Language: zh-CN,||00000190| 7a 68 3b 71 3d 30 2e 39 0d 0a 46 6f 72 77 61 72 |zh;q=0.9..Forwar||000001a0| 64 65 64 3a 20 70 72 6f 74 6f 3d 68 74 74 70 3b |ded: proto=http;||000001b0| 68 6f 73 74 3d 22 31 32 37 2e 30 2e 30 2e 31 3a |host="127.0.0.1:||000001c0| 38 31 38 31 22 3b 66 6f 72 3d 22 31 32 37 2e 30 |8181";for="127.0||000001d0| 2e 30 2e 31 3a 35 32 37 39 37 22 0d 0a 58 2d 46 |.0.1:52797"..X-F||000001e0| 6f 72 77 61 72 64 65 64 2d 46 6f 72 3a 20 31 32 |orwarded-For: 12||000001f0| 37 2e 30 2e 30 2e 31 0d 0a 58 2d 46 6f 72 77 61 |7.0.0.1..X-Forwa||00000200| 72 64 65 64 2d 50 72 6f 74 6f 3a 20 68 74 74 70 |rded-Proto: http||00000210| 0d 0a 58 2d 46 6f 72 77 61 72 64 65 64 2d 50 72 |..X-Forwarded-Pr||00000220| 65 66 69 78 3a 20 2f 74 65 73 74 2d 73 73 0d 0a |efix: /test-ss..||00000230| 58 2d 46 6f 72 77 61 72 64 65 64 2d 50 6f 72 74 |X-Forwarded-Port||00000240| 3a 20 38 31 38 31 0d 0a 58 2d 46 6f 72 77 61 72 |: 8181..X-Forwar||00000250| 64 65 64 2d 48 6f 73 74 3a 20 31 32 37 2e 30 2e |ded-Host: 127.0.||00000260| 30 2e 31 3a 38 31 38 31 0d 0a 68 6f 73 74 3a 20 |0.1:8181..host: ||00000270| 68 74 74 70 62 69 6e 2e 6f 72 67 0d 0a 58 2d 42 |httpbin.org..X-B||00000280| 33 2d 54 72 61 63 65 49 64 3a 20 65 66 39 36 35 |3-TraceId: ef965||00000290| 33 61 30 30 30 33 65 64 36 38 65 0d 0a 58 2d 42 |3a0003ed68e..X-B||000002a0| 33 2d 53 70 61 6e 49 64 3a 20 38 32 62 36 61 30 |3-SpanId: 82b6a0||000002b0| 32 30 32 64 63 31 35 36 36 62 0d 0a 58 2d 42 33 |202dc1566b..X-B3||000002c0| 2d 50 61 72 65 6e 74 53 70 61 6e 49 64 3a 20 65 |-ParentSpanId: e||000002d0| 66 39 36 35 33 61 30 30 30 33 65 64 36 38 65 0d |f9653a0003ed68e.||000002e0| 0a 58 2d 42 33 2d 53 61 6d 70 6c 65 64 3a 20 30 |.X-B3-Sampled: 0||000002f0| 0d 0a 63 6f 6e 74 65 6e 74 2d 6c 65 6e 67 74 68 |..content-length||00000300| 3a 20 30 0d 0a 0d 0a                            |: 0....         |+--------+-------------------------------------------------+----------------+2021-11-27 01:16:06,672 DEBUG [sports,,] [10632] [reactor-http-nio-6][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:6666c1d1-1, L:/172.168.160.198:52819 - R:httpbin.org/18.232.227.86:80] FLUSH2021-11-27 01:16:06,890 DEBUG [sports,,] [10632] [reactor-http-nio-6][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:6666c1d1-1, L:/172.168.160.198:52819 - R:httpbin.org/18.232.227.86:80] READ: 1315B+-------------------------------------------------+|  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |+--------+-------------------------------------------------+----------------+|00000000| 48 54 54 50 2f 31 2e 31 20 32 30 30 20 4f 4b 0d |HTTP/1.1 200 OK.||00000010| 0a 44 61 74 65 3a 20 53 61 74 2c 20 32 37 20 4e |.Date: Sat, 27 N||00000020| 6f 76 20 32 30 32 31 20 30 31 3a 31 36 3a 30 34 |ov 2021 01:16:04||00000030| 20 47 4d 54 0d 0a 43 6f 6e 74 65 6e 74 2d 54 79 | GMT..Content-Ty||00000040| 70 65 3a 20 61 70 70 6c 69 63 61 74 69 6f 6e 2f |pe: application/||00000050| 6a 73 6f 6e 0d 0a 43 6f 6e 74 65 6e 74 2d 4c 65 |json..Content-Le||00000060| 6e 67 74 68 3a 20 31 30 38 34 0d 0a 43 6f 6e 6e |ngth: 1084..Conn||00000070| 65 63 74 69 6f 6e 3a 20 6b 65 65 70 2d 61 6c 69 |ection: keep-ali||00000080| 76 65 0d 0a 53 65 72 76 65 72 3a 20 67 75 6e 69 |ve..Server: guni||00000090| 63 6f 72 6e 2f 31 39 2e 39 2e 30 0d 0a 41 63 63 |corn/19.9.0..Acc||000000a0| 65 73 73 2d 43 6f 6e 74 72 6f 6c 2d 41 6c 6c 6f |ess-Control-Allo||000000b0| 77 2d 4f 72 69 67 69 6e 3a 20 2a 0d 0a 41 63 63 |w-Origin: *..Acc||000000c0| 65 73 73 2d 43 6f 6e 74 72 6f 6c 2d 41 6c 6c 6f |ess-Control-Allo||000000d0| 77 2d 43 72 65 64 65 6e 74 69 61 6c 73 3a 20 74 |w-Credentials: t||000000e0| 72 75 65 0d 0a 0d 0a 7b 0a 20 20 22 61 72 67 73 |rue....{.  "args||000000f0| 22 3a 20 7b 7d 2c 20 0a 20 20 22 64 61 74 61 22 |": {}, .  "data"||00000100| 3a 20 22 22 2c 20 0a 20 20 22 66 69 6c 65 73 22 |: "", .  "files"||00000110| 3a 20 7b 7d 2c 20 0a 20 20 22 66 6f 72 6d 22 3a |: {}, .  "form":||00000120| 20 7b 7d 2c 20 0a 20 20 22 68 65 61 64 65 72 73 | {}, .  "headers||00000130| 22 3a 20 7b 0a 20 20 20 20 22 41 63 63 65 70 74 |": {.    "Accept||00000140| 22 3a 20 22 74 65 78 74 2f 68 74 6d 6c 2c 61 70 |": "text/html,ap||00000150| 70 6c 69 63 61 74 69 6f 6e 2f 78 68 74 6d 6c 2b |plication/xhtml+||00000160| 78 6d 6c 2c 61 70 70 6c 69 63 61 74 69 6f 6e 2f |xml,application/||00000170| 78 6d 6c 3b 71 3d 30 2e 39 2c 69 6d 61 67 65 2f |xml;q=0.9,image/||00000180| 77 65 62 70 2c 69 6d 61 67 65 2f 61 70 6e 67 2c |webp,image/apng,||00000190| 2a 2f 2a 3b 71 3d 30 2e 38 22 2c 20 0a 20 20 20 |*/*;q=0.8", .   ||000001a0| 20 22 41 63 63 65 70 74 2d 45 6e 63 6f 64 69 6e | "Accept-Encodin||000001b0| 67 22 3a 20 22 67 7a 69 70 2c 20 64 65 66 6c 61 |g": "gzip, defla||000001c0| 74 65 2c 20 62 72 22 2c 20 0a 20 20 20 20 22 41 |te, br", .    "A||000001d0| 63 63 65 70 74 2d 4c 61 6e 67 75 61 67 65 22 3a |ccept-Language":||000001e0| 20 22 7a 68 2d 43 4e 2c 7a 68 3b 71 3d 30 2e 39 | "zh-CN,zh;q=0.9||000001f0| 22 2c 20 0a 20 20 20 20 22 43 61 63 68 65 2d 43 |", .    "Cache-C||00000200| 6f 6e 74 72 6f 6c 22 3a 20 22 6d 61 78 2d 61 67 |ontrol": "max-ag||00000210| 65 3d 30 22 2c 20 0a 20 20 20 20 22 43 6f 6e 74 |e=0", .    "Cont||00000220| 65 6e 74 2d 4c 65 6e 67 74 68 22 3a 20 22 30 22 |ent-Length": "0"||00000230| 2c 20 0a 20 20 20 20 22 46 6f 72 77 61 72 64 65 |, .    "Forwarde||00000240| 64 22 3a 20 22 70 72 6f 74 6f 3d 68 74 74 70 3b |d": "proto=http;||00000250| 68 6f 73 74 3d 5c 22 31 32 37 2e 30 2e 30 2e 31 |host=\\"127.0.0.1||00000260| 3a 38 31 38 31 5c 22 3b 66 6f 72 3d 5c 22 31 32 |:8181\\";for=\\"12||00000270| 37 2e 30 2e 30 2e 31 3a 35 32 37 39 37 5c 22 22 |7.0.0.1:52797\\""||00000280| 2c 20 0a 20 20 20 20 22 48 6f 73 74 22 3a 20 22 |, .    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"X-Amzn||00000380| 2d 54 72 61 63 65 2d 49 64 22 3a 20 22 52 6f 6f |-Trace-Id": "Roo||00000390| 74 3d 31 2d 36 31 61 31 38 36 64 34 2d 34 31 38 |t=1-61a186d4-418||000003a0| 32 30 65 31 66 36 33 39 30 32 64 34 64 33 63 63 |20e1f63902d4d3cc||000003b0| 64 38 62 39 64 22 2c 20 0a 20 20 20 20 22 58 2d |d8b9d", .    "X-||000003c0| 42 33 2d 50 61 72 65 6e 74 73 70 61 6e 69 64 22 |B3-Parentspanid"||000003d0| 3a 20 22 65 66 39 36 35 33 61 30 30 30 33 65 64 |: "ef9653a0003ed||000003e0| 36 38 65 22 2c 20 0a 20 20 20 20 22 58 2d 42 33 |68e", .    "X-B3||000003f0| 2d 53 61 6d 70 6c 65 64 22 3a 20 22 30 22 2c 20 |-Sampled": "0", ||00000400| 0a 20 20 20 20 22 58 2d 42 33 2d 53 70 61 6e 69 |.    "X-B3-Spani||00000410| 64 22 3a 20 22 38 32 62 36 61 30 32 30 32 64 63 |d": "82b6a0202dc||00000420| 31 35 36 36 62 22 2c 20 0a 20 20 20 20 22 58 2d |1566b", .    "X-||00000430| 42 33 2d 54 72 61 63 65 69 64 22 3a 20 22 65 66 |B3-Traceid": "ef||00000440| 39 36 35 33 61 30 30 30 33 65 64 36 38 65 22 2c |9653a0003ed68e",||00000450| 20 0a 20 20 20 20 22 58 2d 46 6f 72 77 61 72 64 | .    "X-Forward||00000460| 65 64 2d 48 6f 73 74 22 3a 20 22 31 32 37 2e 30 |ed-Host": "127.0||00000470| 2e 30 2e 31 3a 38 31 38 31 22 2c 20 0a 20 20 20 |.0.1:8181", .   ||00000480| 20 22 58 2d 46 6f 72 77 61 72 64 65 64 2d 50 72 | "X-Forwarded-Pr||00000490| 65 66 69 78 22 3a 20 22 2f 74 65 73 74 2d 73 73 |efix": "/test-ss||000004a0| 22 0a 20 20 7d 2c 20 0a 20 20 22 6a 73 6f 6e 22 |".  }, .  "json"||000004b0| 3a 20 6e 75 6c 6c 2c 20 0a 20 20 22 6d 65 74 68 |: null, .  "meth||000004c0| 6f 64 22 3a 20 22 47 45 54 22 2c 20 0a 20 20 22 |od": "GET", .  "||000004d0| 6f 72 69 67 69 6e 22 3a 20 22 31 32 37 2e 30 2e |origin": "127.0.||000004e0| 30 2e 31 2c 20 35 39 2e 31 35 32 2e 32 35 34 2e |0.1, 59.152.254.||000004f0| 32 33 38 22 2c 20 0a 20 20 22 75 72 6c 22 3a 20 |238", .  "url": ||00000500| 22 68 74 74 70 3a 2f 2f 31 32 37 2e 30 2e 30 2e |"http://127.0.0.||00000510| 31 3a 38 31 38 31 2f 61 6e 79 74 68 69 6e 67 22 |1:8181/anything"||00000520| 0a 7d 0a                                        |.}.             |+--------+-------------------------------------------------+----------------+2021-11-27 01:16:06,904 DEBUG [sports,,] [10632] [reactor-http-nio-2][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:1277d54e-2, L:/127.0.0.1:8181 - R:/127.0.0.1:52797] WRITE: 207B+-------------------------------------------------+|  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |+--------+-------------------------------------------------+----------------+|00000000| 48 54 54 50 2f 31 2e 31 20 32 30 30 20 4f 4b 0d |HTTP/1.1 200 OK.||00000010| 0a 44 61 74 65 3a 20 53 61 74 2c 20 32 37 20 4e |.Date: Sat, 27 N||00000020| 6f 76 20 32 30 32 31 20 30 31 3a 31 36 3a 30 34 |ov 2021 01:16:04||00000030| 20 47 4d 54 0d 0a 43 6f 6e 74 65 6e 74 2d 54 79 | GMT..Content-Ty||00000040| 70 65 3a 20 61 70 70 6c 69 63 61 74 69 6f 6e 2f |pe: application/||00000050| 6a 73 6f 6e 0d 0a 53 65 72 76 65 72 3a 20 67 75 |json..Server: gu||00000060| 6e 69 63 6f 72 6e 2f 31 39 2e 39 2e 30 0d 0a 41 |nicorn/19.9.0..A||00000070| 63 63 65 73 73 2d 43 6f 6e 74 72 6f 6c 2d 41 6c |ccess-Control-Al||00000080| 6c 6f 77 2d 4f 72 69 67 69 6e 3a 20 2a 0d 0a 41 |low-Origin: *..A||00000090| 63 63 65 73 73 2d 43 6f 6e 74 72 6f 6c 2d 41 6c |ccess-Control-Al||000000a0| 6c 6f 77 2d 43 72 65 64 65 6e 74 69 61 6c 73 3a |low-Credentials:||000000b0| 20 74 72 75 65 0d 0a 63 6f 6e 74 65 6e 74 2d 6c | true..content-l||000000c0| 65 6e 67 74 68 3a 20 31 30 38 34 0d 0a 0d 0a    |ength: 1084.... |+--------+-------------------------------------------------+----------------+2021-11-27 01:16:06,904 DEBUG [sports,,] [10632] [reactor-http-nio-2][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:1277d54e-2, L:/127.0.0.1:8181 - R:/127.0.0.1:52797] FLUSH2021-11-27 01:16:06,909 DEBUG [sports,,] [10632] [reactor-http-nio-2][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:1277d54e-2, L:/127.0.0.1:8181 - R:/127.0.0.1:52797] WRITE: 1084B+-------------------------------------------------+|  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |+--------+-------------------------------------------------+----------------+|00000000| 7b 0a 20 20 22 61 72 67 73 22 3a 20 7b 7d 2c 20 |{.  "args": {}, ||00000010| 0a 20 20 22 64 61 74 61 22 3a 20 22 22 2c 20 0a |.  "data": "", .||00000020| 20 20 22 66 69 6c 65 73 22 3a 20 7b 7d 2c 20 0a |  "files": {}, .||00000030| 20 20 22 66 6f 72 6d 22 3a 20 7b 7d 2c 20 0a 20 |  "form": {}, . ||00000040| 20 22 68 65 61 64 65 72 73 22 3a 20 7b 0a 20 20 | "headers": {.  ||00000050| 20 20 22 41 63 63 65 70 74 22 3a 20 22 74 65 78 |  "Accept": "tex||00000060| 74 2f 68 74 6d 6c 2c 61 70 70 6c 69 63 61 74 69 |t/html,applicati||00000070| 6f 6e 2f 78 68 74 6d 6c 2b 78 6d 6c 2c 61 70 70 |on/xhtml+xml,app||00000080| 6c 69 63 61 74 69 6f 6e 2f 78 6d 6c 3b 71 3d 30 |lication/xml;q=0||00000090| 2e 39 2c 69 6d 61 67 65 2f 77 65 62 70 2c 69 6d |.9,image/webp,im||000000a0| 61 67 65 2f 61 70 6e 67 2c 2a 2f 2a 3b 71 3d 30 |age/apng,*/*;q=0||000000b0| 2e 38 22 2c 20 0a 20 20 20 20 22 41 63 63 65 70 |.8", .    "Accep||000000c0| 74 2d 45 6e 63 6f 64 69 6e 67 22 3a 20 22 67 7a |t-Encoding": "gz||000000d0| 69 70 2c 20 64 65 66 6c 61 74 65 2c 20 62 72 22 |ip, deflate, br"||000000e0| 2c 20 0a 20 20 20 20 22 41 63 63 65 70 74 2d 4c |, .    "Accept-L||000000f0| 61 6e 67 75 61 67 65 22 3a 20 22 7a 68 2d 43 4e |anguage": "zh-CN||00000100| 2c 7a 68 3b 71 3d 30 2e 39 22 2c 20 0a 20 20 20 |,zh;q=0.9", .   ||00000110| 20 22 43 61 63 68 65 2d 43 6f 6e 74 72 6f 6c 22 | "Cache-Control"||00000120| 3a 20 22 6d 61 78 2d 61 67 65 3d 30 22 2c 20 0a |: "max-age=0", .||00000130| 20 20 20 20 22 43 6f 6e 74 65 6e 74 2d 4c 65 6e |    "Content-Len||00000140| 67 74 68 22 3a 20 22 30 22 2c 20 0a 20 20 20 20 |gth": "0", .    ||00000150| 22 46 6f 72 77 61 72 64 65 64 22 3a 20 22 70 72 |"Forwarded": "pr||00000160| 6f 74 6f 3d 68 74 74 70 3b 68 6f 73 74 3d 5c 22 |oto=http;host=\\"||00000170| 31 32 37 2e 30 2e 30 2e 31 3a 38 31 38 31 5c 22 |127.0.0.1:8181\\"||00000180| 3b 66 6f 72 3d 5c 22 31 32 37 2e 30 2e 30 2e 31 |;for=\\"127.0.0.1||00000190| 3a 35 32 37 39 37 5c 22 22 2c 20 0a 20 20 20 20 |:52797\\"", .    ||000001a0| 22 48 6f 73 74 22 3a 20 22 68 74 74 70 62 69 6e |"Host": "httpbin||000001b0| 2e 6f 72 67 22 2c 20 0a 20 20 20 20 22 55 70 67 |.org", .    "Upg||000001c0| 72 61 64 65 2d 49 6e 73 65 63 75 72 65 2d 52 65 |rade-Insecure-Re||000001d0| 71 75 65 73 74 73 22 3a 20 22 31 22 2c 20 0a 20 |quests": "1", . ||000001e0| 20 20 20 22 55 73 65 72 2d 41 67 65 6e 74 22 3a |   "User-Agent":||000001f0| 20 22 4d 6f 7a 69 6c 6c 61 2f 35 2e 30 20 28 57 | "Mozilla/5.0 (W||00000200| 69 6e 64 6f 77 73 20 4e 54 20 31 30 2e 30 3b 20 |indows NT 10.0; ||00000210| 57 4f 57 36 34 29 20 41 70 70 6c 65 57 65 62 4b |WOW64) AppleWebK||00000220| 69 74 2f 35 33 37 2e 33 36 20 28 4b 48 54 4d 4c |it/537.36 (KHTML||00000230| 2c 20 6c 69 6b 65 20 47 65 63 6b 6f 29 20 43 68 |, like Gecko) Ch||00000240| 72 6f 6d 65 2f 37 30 2e 30 2e 33 35 33 38 2e 32 |rome/70.0.3538.2||00000250| 35 20 53 61 66 61 72 69 2f 35 33 37 2e 33 36 20 |5 Safari/537.36 ||00000260| 43 6f 72 65 2f 31 2e 37 30 2e 33 38 37 39 2e 34 |Core/1.70.3879.4||00000270| 30 30 20 51 51 42 72 6f 77 73 65 72 2f 31 30 2e |00 QQBrowser/10.||00000280| 38 2e 34 35 35 32 2e 34 30 30 22 2c 20 0a 20 20 |8.4552.400", .  ||00000290| 20 20 22 58 2d 41 6d 7a 6e 2d 54 72 61 63 65 2d |  "X-Amzn-Trace-||000002a0| 49 64 22 3a 20 22 52 6f 6f 74 3d 31 2d 36 31 61 |Id": "Root=1-61a||000002b0| 31 38 36 64 34 2d 34 31 38 32 30 65 31 66 36 33 |186d4-41820e1f63||000002c0| 39 30 32 64 34 64 33 63 63 64 38 62 39 64 22 2c |902d4d3ccd8b9d",||000002d0| 20 0a 20 20 20 20 22 58 2d 42 33 2d 50 61 72 65 | .    "X-B3-Pare||000002e0| 6e 74 73 70 61 6e 69 64 22 3a 20 22 65 66 39 36 |ntspanid": "ef96||000002f0| 35 33 61 30 30 30 33 65 64 36 38 65 22 2c 20 0a |53a0003ed68e", .||00000300| 20 20 20 20 22 58 2d 42 33 2d 53 61 6d 70 6c 65 |    "X-B3-Sample||00000310| 64 22 3a 20 22 30 22 2c 20 0a 20 20 20 20 22 58 |d": "0", .    "X||00000320| 2d 42 33 2d 53 70 61 6e 69 64 22 3a 20 22 38 32 |-B3-Spanid": "82||00000330| 62 36 61 30 32 30 32 64 63 31 35 36 36 62 22 2c |b6a0202dc1566b",||00000340| 20 0a 20 20 20 20 22 58 2d 42 33 2d 54 72 61 63 | .    "X-B3-Trac||00000350| 65 69 64 22 3a 20 22 65 66 39 36 35 33 61 30 30 |eid": "ef9653a00||00000360| 30 33 65 64 36 38 65 22 2c 20 0a 20 20 20 20 22 |03ed68e", .    "||00000370| 58 2d 46 6f 72 77 61 72 64 65 64 2d 48 6f 73 74 |X-Forwarded-Host||00000380| 22 3a 20 22 31 32 37 2e 30 2e 30 2e 31 3a 38 31 |": "127.0.0.1:81||00000390| 38 31 22 2c 20 0a 20 20 20 20 22 58 2d 46 6f 72 |81", .    "X-For||000003a0| 77 61 72 64 65 64 2d 50 72 65 66 69 78 22 3a 20 |warded-Prefix": ||000003b0| 22 2f 74 65 73 74 2d 73 73 22 0a 20 20 7d 2c 20 |"/test-ss".  }, ||000003c0| 0a 20 20 22 6a 73 6f 6e 22 3a 20 6e 75 6c 6c 2c |.  "json": null,||000003d0| 20 0a 20 20 22 6d 65 74 68 6f 64 22 3a 20 22 47 | .  "method": "G||000003e0| 45 54 22 2c 20 0a 20 20 22 6f 72 69 67 69 6e 22 |ET", .  "origin"||000003f0| 3a 20 22 31 32 37 2e 30 2e 30 2e 31 2c 20 35 39 |: "127.0.0.1, 59||00000400| 2e 31 35 32 2e 32 35 34 2e 32 33 38 22 2c 20 0a |.152.254.238", .||00000410| 20 20 22 75 72 6c 22 3a 20 22 68 74 74 70 3a 2f |  "url": "http:/||00000420| 2f 31 32 37 2e 30 2e 30 2e 31 3a 38 31 38 31 2f |/127.0.0.1:8181/||00000430| 61 6e 79 74 68 69 6e 67 22 0a 7d 0a             |anything".}.    |+--------+-------------------------------------------------+----------------+2021-11-27 01:16:06,909 DEBUG [sports,,] [10632] [reactor-http-nio-6][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:6666c1d1, L:/172.168.160.198:52819 - R:httpbin.org/18.232.227.86:80] READ COMPLETE2021-11-27 01:16:06,910 DEBUG [sports,,] [10632] [reactor-http-nio-2][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:1277d54e-2, L:/127.0.0.1:8181 - R:/127.0.0.1:52797] FLUSH2021-11-27 01:16:06,910 DEBUG [sports,,] [10632] [reactor-http-nio-2][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:1277d54e-2, L:/127.0.0.1:8181 - R:/127.0.0.1:52797] WRITE: 0B2021-11-27 01:16:06,910 DEBUG [sports,,] [10632] [reactor-http-nio-2][io.netty.util.internal.logging.AbstractInternalLogger:145]:[id:1277d54e-2, L:/127.0.0.1:8181 - R:/127.0.0.1:52797] FLUSH

可以从日志中看出下面比较重要的信息：

• 从抓包日志从可以得出 HTTP 请求与响应包中的所有内容。
• 这里的日志，由于没被 spring-cloud-sleuth 包装，所以日志本身的占位符没有相关链路信息
• 但是从包中，可以看到 spring-cloud-sleuth 的链路信息，这里是:

  "X-B3-Parentspanid": "ef9653a0003ed68e", "X-B3-Sampled": "0", "X-B3-Spanid": "82b6a0202dc1566b", "X-B3-Traceid": "ef9653a0003ed68e",

• netty 本身有 traceId，即这里的

  6666c1d1

  和

  1277d54e

  (分别是作为 HttpServer 接受请求和作为 HttpClient 转发请求后台微服务)，这样其实就可以将 spring-cloud-sleuth 的链路信息与 netty 的链路信息结合在一起

这些日志很全面，但是有下面一些不好用的问题：

• 只能输出所有请求响应的包内容，并不能定制输出哪些内容。例如对于文件上传请求，我们其实并不想看他的请求体，但是这里无法定制化。
• 日志太多了，会影响我们的性能。

HttpWebHandlerAdapter 的 TRACE 日志

在系列前面文章的源码分析中，我们知道在入口的 HttpWebHandlerAdapter 中有请求与响应日志，可以通过下面的配置进行启用：

<AsyncLogger name="org.springframework.web.server.adapter.HttpWebHandlerAdapter" level="trace" additivity="false" includeLocation="true"><appender-ref ref="console" /></AsyncLogger>

这样就能启用类似于下面的日志：

2021-11-27 01:25:28,472 TRACE [sports,,] [16188] [reactor-http-nio-2][org.springframework.core.log.LogFormatUtils:88]:[8d5138d1-3] HTTP GET "/test-ss/anything", headers={masked}2021-11-27 01:25:28,696 TRACE [sports,,] [16188] [reactor-http-nio-2][org.springframework.core.log.LogFormatUtils:88]:[8d5138d1-3] Completed 200 OK, headers={masked}

如何让 headers 不要被掩码，可以通过下面的配置实现：

spring.codec:log-request-details: true

这个配置对应的配置类是：

CodecProperties

，通过源码我们也可以发现，我们还可以在这里限制 body 的大小：

CodecProperties.java

@ConfigurationProperties(prefix = "spring.codec")public class CodecProperties {private boolean logRequestDetails;private DataSize maxInMemorySize;}

加上配置后，日志如下：

2021-11-27 01:32:50,501 TRACE [sports,,] [17668] [reactor-http-nio-2][org.springframework.core.log.LogFormatUtils:88]:[ecf9f55a-1] HTTP GET "/test-ss/anything", headers=[Host:"127.0.0.1:8181", Connection:"keep-alive", Cache-Control:"max-age=0", Upgrade-Insecure-Requests:"1", User-Agent:"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.25 Safari/537.36 Core/1.70.3879.400 QQBrowser/10.8.4552.400", Accept:"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8", Accept-Encoding:"gzip, deflate, br", Accept-Language:"zh-CN,zh;q=0.9"]2021-11-27 01:32:51,212 TRACE [sports,,] [17668] [reactor-http-nio-2][org.springframework.core.log.LogFormatUtils:88]:[ecf9f55a-1] Completed 200 OK, headers=[Date:"Sat, 27 Nov 2021 01:32:48 GMT", Content-Type:"application/json", Server:"gunicorn/19.9.0", Access-Control-Allow-Origin:"*", Access-Control-Allow-Credentials:"true", content-length:"1084"]

但是这个日志内容太少，只包含请求和响应头，并且没有 spring-cloud-sleuth 相关的链路信息。

AccessLog

Spring Cloud Gateway 使用基于 reactor-netty 的 http 服务器，在 spring-boot 的封装中，可以通过添加

NettyServerCustomizer

Bean 来实现添加自定义 AccessLog。AccessLog 包含的元素有：

AccessLogArgProvider.java

public interface AccessLogArgProvider {@Nullable@DeprecatedString zonedDateTime();@NullableZonedDateTime accessDateTime();@NullableSocketAddress remoteAddress();@NullableCharSequence method();@NullableCharSequence uri();@NullableString protocol();@NullableString user();@NullableCharSequence status();long contentLength();long duration();@NullableCharSequence requestHeader(CharSequence name);@NullableCharSequence responseHeader(CharSequence name);@NullableMap<CharSequence, Set<Cookie>> cookies();}

可以看出里面没有 spring cloud sleuth 相关的链路信息，但是我们可以通过实现 Global Filter 将链路信息加入 Response 的 Header 中，并且通过

AccessLogArgProvider

的

requestHeader

将这些 Header 输出到 accesslog：

package com.github.jojotech.spring.cloud.apigateway.filter;import java.util.List;import lombok.extern.log4j.Log4j2;import reactor.core.publisher.Mono;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.cloud.gateway.filter.GatewayFilterChain;import org.springframework.cloud.gateway.filter.GlobalFilter;import org.springframework.cloud.sleuth.Span;import org.springframework.cloud.sleuth.TraceContext;import org.springframework.cloud.sleuth.Tracer;import org.springframework.core.Ordered;import org.springframework.http.HttpHeaders;import org.springframework.http.server.reactive.ServerHttpResponse;import org.springframework.stereotype.Component;import org.springframework.web.server.ServerWebExchange;@Log4j2@Componentpublic class CommonTraceFilter implements GlobalFilter, Ordered {public static final String TRACE_ID = "traceId";public static final String SPAN_ID = "spanId";@Autowiredprivate Tracer tracer;@Overridepublic Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {Span span = tracer.currentSpan();if (span == null) {span = tracer.nextSpan();}TraceContext context = span.context();ServerHttpResponse response = exchange.getResponse();HttpHeaders headers = response.getHeaders();headers.put(TRACE_ID, List.of(context.traceId()));headers.put(SPAN_ID, List.of(context.spanId()));return chain.filter(exchange);}@Overridepublic int getOrder() {//需要在所有的 Filter 之前，拿到 trace 信息return Ordered.HIGHEST_PRECEDENCE;}}

然后，通过实现

NettyServerCustomizer

注册一个 Bean 来配置 Access Log。

package com.github.jojotech.spring.cloud.apigateway.filter;import java.net.InetSocketAddress;import java.net.SocketAddress;import reactor.netty.http.server.HttpServer;import reactor.netty.http.server.logging.AccessLog;import reactor.netty.http.server.logging.AccessLogFactory;import reactor.util.annotation.Nullable;import org.springframework.boot.web.embedded.netty.NettyServerCustomizer;import org.springframework.stereotype.Component;@Componentpublic class AccessLogNettyServerCustomizer implements NettyServerCustomizer {static final String DEFAULT_LOG_FORMAT ="{},{} -> {} - {} [{}] \\"{} {} {}\\" {} {} {} ms";static final String MISSING = "-";@Overridepublic HttpServer apply(HttpServer httpServer) {httpServer = httpServer.accessLog(true, AccessLogFactory.createFilter(accessLogArgProvider -> {//所有的都打印return true;}, accessLogArgProvider -> {return AccessLog.create(DEFAULT_LOG_FORMAT, accessLogArgProvider.responseHeader(CommonTraceFilter.TRACE_ID) == null ? MISSING : accessLogArgProvider.responseHeader(CommonTraceFilter.TRACE_ID), accessLogArgProvider.responseHeader(CommonTraceFilter.SPAN_ID) == null ? MISSING : accessLogArgProvider.responseHeader(CommonTraceFilter.SPAN_ID), applyAddress(accessLogArgProvider.remoteAddress()), accessLogArgProvider.user(),accessLogArgProvider.zonedDateTime(), accessLogArgProvider.method(), accessLogArgProvider.uri(), accessLogArgProvider.protocol(), accessLogArgProvider.status(),accessLogArgProvider.contentLength() > -1 ? accessLogArgProvider.contentLength() : MISSING, accessLogArgProvider.duration());}));return httpServer;}static String applyAddress(@Nullable SocketAddress socketAddress) {if (socketAddress instanceof InetSocketAddress) {InetSocketAddress inetSocketAddress = (InetSocketAddress) socketAddress;return inetSocketAddress.getHostString() + ":" + inetSocketAddress.getPort();}else {return MISSING;}}}

这样，我们就可以得到像下面的 access log：

2021-11-27 03:56:10,948  INFO [sports,,] [8536] [reactor-http-nio-2][reactor.util.Loggers$Slf4JLogger:269]:baa69b779a8497eb,baa69b779a8497eb -> 127.0.0.1:64196 - - [2021-11-27T03:56:10.720844200Z[Etc/GMT]] "GET /test-ss/anything HTTP/1.1" 200 1084 228 ms

accesslog 的也不能输出 body，所以我们还是需要定制自己的日志 Filter。

我们在下一节，会开始实现我们自己定制的日志 Filter

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