SpringCloudGateway笔记(8)-权重

红太狼 2021-12-14 21:53 675阅读 0赞

使用SpringCloudGateway的重要功能 – 权重路由

由于后端的服务器有时候性能不同，或者是由于需要灰度发布，需要上线一部分新版本的服务

注：灰度发布是指在黑与白之间，能够平滑过渡的一种发布方式。AB test就是一种灰度发布方式，让一部分用户继续用A，一部分用户开始用B，如果用户对B没有什么反对意见，那么逐步扩大范围，把所有用户都迁移到B上面来。灰度发布可以保证整体系统的稳定，在初始灰度的时候就可以发现、调整问题，以保证其影响度，而我们平常所说的金丝雀部署也就是灰度发布的一种方式。

spring-cloud-gateway自身提供一个predicate叫WeightRoutePredicateFactory，在启动的时候也可以看到

2019-05-29 23:06:47.321  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [After]
    2019-05-29 23:06:47.321  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [Before]
    2019-05-29 23:06:47.322  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [Between]
    2019-05-29 23:06:47.322  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [Cookie]
    2019-05-29 23:06:47.322  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [Header]
    2019-05-29 23:06:47.322  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [Host]
    2019-05-29 23:06:47.322  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [Method]
    2019-05-29 23:06:47.322  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [Path]
    2019-05-29 23:06:47.322  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [Query]
    2019-05-29 23:06:47.322  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [ReadBodyPredicateFactory]
    2019-05-29 23:06:47.322  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [RemoteAddr]
    2019-05-29 23:06:47.322  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [Weight]
    2019-05-29 23:06:47.322  INFO 4736 --- [           main] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [CloudFoundryRouteService]

但是不知道为什么在文档里面没有相关的描述，在官方ISSUE里面也有人提到了这个问题

[https://github.com/spring-cloud/spring-cloud-gateway/issues/1072][https_github.com_spring-cloud_spring-cloud-gateway_issues_1072]

具体的使用方式

routes:
            - id: spring-cloud-client-demo
              uri: lb://spring-cloud-client-demo
              predicates:
                - Path=/client/**
                - Weight=group1, 2
              filters:
                - AddRequestHeader=X-Request-Foo, Bar
                - StripPrefix=1
                - SaveSession
            - id: spring-cloud-client-demo1
              uri: lb://spring-cloud-client-demo
              predicates:
                - Path=/client/**
                - Weight=group1, 8
              filters:
                - StripPrefix=2

Weight有两个属性，group1是指定分组，后面的数字代表了权重

使用PostMan发起请求

GET [http://localhost:10001/client/demo/demo/weight?param=mt][http_localhost_10001_client_demo_demo_weight_param_mt]

在对应的spring-cloud-client-demo工程里面有两个不同的controller

@GetMapping("/weight")
        public String weight(@RequestParam String param) {
            log.info("aaaa: {}", param);
            return "aaa";
        }
    
    
        @GetMapping("/demo/weight")
        public String demoWeight(@RequestParam String param) {
            log.info("===============sb: {}", param);
            return "bbb";
        }

发起多次请求，可以观察到大概满足1：4这样一个比例

2019-05-29 23:19:15.462  INFO 1764 --- [nio-8801-exec-1] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:29.399  INFO 1764 --- [nio-8801-exec-2] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:33.512  INFO 1764 --- [nio-8801-exec-3] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:36.425  INFO 1764 --- [nio-8801-exec-5] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:19:37.404  INFO 1764 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:19:39.425  INFO 1764 --- [nio-8801-exec-4] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:42.396  INFO 1764 --- [nio-8801-exec-7] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:44.393  INFO 1764 --- [nio-8801-exec-8] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:45.422  INFO 1764 --- [nio-8801-exec-9] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:47.398  INFO 1764 --- [io-8801-exec-10] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:19:48.389  INFO 1764 --- [nio-8801-exec-1] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:50.499  INFO 1764 --- [nio-8801-exec-2] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:54.380  INFO 1764 --- [nio-8801-exec-3] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:55.399  INFO 1764 --- [nio-8801-exec-5] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:56.404  INFO 1764 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:57.402  INFO 1764 --- [nio-8801-exec-4] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:58.393  INFO 1764 --- [nio-8801-exec-7] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:19:59.395  INFO 1764 --- [nio-8801-exec-8] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:20:00.397  INFO 1764 --- [nio-8801-exec-9] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:20:02.408  INFO 1764 --- [io-8801-exec-10] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:20:03.390  INFO 1764 --- [nio-8801-exec-1] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:20:05.435  INFO 1764 --- [nio-8801-exec-2] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:20:06.430  INFO 1764 --- [nio-8801-exec-3] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:20:13.410  INFO 1764 --- [nio-8801-exec-5] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:20:14.435  INFO 1764 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:20:17.481  INFO 1764 --- [nio-8801-exec-4] c.m.d.client.controller.DemoController   : aaaa: mt

#### 这里还有一种情况是反向代理的时候，因为url只能写一个，所以可以配置一组反向代理，这样就满足了往多个地址代理的需求 ####

例如，这里proxy为了方便两个使用了一个url，实际是使用不同的地址

- id: proxy
              uri: http://localhost:8801
              predicates:
                - Path=/demo/**
                - Weight=group2, 8
            - id: proxy1
              uri: http://localhost:8801
              predicates:
                - Path=/demo/**
                - Weight=group2, 2
              filters:
                - StripPrefix=1

用PostMan发起请求

[http://localhost:10001/demo/demo/weight?param=mt][http_localhost_10001_demo_demo_weight_param_mt]

可以看到，这两个反向代理是属于同一组代理，按照权重来进行路由，实现了不同url的负载均衡

2019-05-29 23:26:07.460  INFO 1764 --- [nio-8801-exec-3] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:26:10.399  INFO 1764 --- [nio-8801-exec-5] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:26:13.482  INFO 1764 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:26:17.424  INFO 1764 --- [nio-8801-exec-4] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:20.390  INFO 1764 --- [nio-8801-exec-7] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:23.405  INFO 1764 --- [nio-8801-exec-8] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:24.405  INFO 1764 --- [nio-8801-exec-9] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:26:26.415  INFO 1764 --- [io-8801-exec-10] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:27.423  INFO 1764 --- [nio-8801-exec-1] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:29.421  INFO 1764 --- [nio-8801-exec-2] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:32.407  INFO 1764 --- [nio-8801-exec-3] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:34.392  INFO 1764 --- [nio-8801-exec-5] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:37.418  INFO 1764 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:38.412  INFO 1764 --- [nio-8801-exec-4] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:40.482  INFO 1764 --- [nio-8801-exec-7] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:43.408  INFO 1764 --- [nio-8801-exec-8] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:26:44.459  INFO 1764 --- [nio-8801-exec-9] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:46.426  INFO 1764 --- [io-8801-exec-10] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:47.403  INFO 1764 --- [nio-8801-exec-1] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:26:48.408  INFO 1764 --- [nio-8801-exec-2] c.m.d.client.controller.DemoController   : aaaa: mt
    2019-05-29 23:26:49.410  INFO 1764 --- [nio-8801-exec-3] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:50.409  INFO 1764 --- [nio-8801-exec-5] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:51.429  INFO 1764 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:53.441  INFO 1764 --- [nio-8801-exec-4] c.m.d.client.controller.DemoController   : ===============sb: mt
    2019-05-29 23:26:55.435  INFO 1764 --- [nio-8801-exec-7] c.m.d.client.controller.DemoController   : ===============sb: mt

[GITHUB代码地址][GITHUB]

欢迎关注微信交流  
![在这里插入图片描述][70]

[https_github.com_spring-cloud_spring-cloud-gateway_issues_1072]: https://github.com/spring-cloud/spring-cloud-gateway/issues/1072
[http_localhost_10001_client_demo_demo_weight_param_mt]: http://localhost:10001/client/demo/demo/weight?param=mt
[http_localhost_10001_demo_demo_weight_param_mt]: http://localhost:10001/demo/demo/weight?param=mt
[GITHUB]: https://github.com/yingziisme/spring-cloud-gateway-demo
[70]: /images/20211214/86a9285eddbc4d958ddc6af32526e3a0.png