Sentinel整合OpenFeign

基本使用

1. 引入依赖

   <dependency>
       <groupId>com.alibaba.cloudgroupId>
       <artifactId>spring-cloud-starter-alibaba-sentinelartifactId>
   dependency>
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2. 添加配置

   # 1. sentinel保护feign开关
   feign.sentinel.enabled=true
   # 2. sentinel dashboard 配置
   spring.cloud.sentinel.transport.dashboard=localhost:8858
   spring.cloud.sentinel.transport.port=8729
   # 3. 基础配置
   spring.application.name=hello-sentinel-feign
   spring.cloud.nacos.discovery.server-addr=localhost:8848
   spring.cloud.loadbalancer.nacos.enabled=true
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3. 编写feign接口并配置fallback属性

   @FeignClient(value = "nacos-client-app"
           , contextId = "nacosHelloClient"
           , fallback = NacosHelloClientFallback.class
   )
   public interface NacosHelloClient {
   
       @GetMapping("/hello/index")
       String hello() ;
   
       @GetMapping("/hello/exception")
       String exception() ;
   }
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4. 编写fallback实现代码

   @Component
   public class NacosHelloClientFallback implements NacosHelloClient {
   
       @Override
       public String hello() {
           return "fallback hello ret value";
       }
       @Override
       public String exception() {
           return "fallback exception ret value";
       }
   }
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配置降级规则

1. 添加配置

   # 配置降级规则
   spring.cloud.sentinel.datasource.ds1.file.dataType=json
   spring.cloud.sentinel.datasource.ds1.file.file=classpath:sentinel/feign-degrade-sentinel.json
   spring.cloud.sentinel.datasource.ds1.file.rule-type=degrade
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2. 编写sentinel/feign-degrade-sentinel.json降级规则 (慢调用降级规则)

   [{
       "resource": "GET:http://nacos-client-app/hello/index",
       "grade": 0,
       "count": 200,
       "timeWindow": 11,
       "minRequestAmount": 6,
       "statIntervalMs": 10000,
       "slowRatio":0.3
   }]
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