Sentinel结合Apollo实现规则持久化功能

概述：本文基于apollo熟练使用的小伙伴参考，因为本文没有安装启动apollo的步骤，只提供apollo的对应的appid和相应的配置，具体apollo部署及客户端配置使用本文未提供，apollo相关依赖本文未提供；

本文使用：
spring-boot-2.6.8版本
spring-cloud-starter-alibaba-2021.0.1.0版本
sentinel-dashboard-1.8.3版本

一、调整sentinel-dashboard源码，调整步骤如下：

1. 将test包中的apollo包移到rule包下面
2. 将最外层pom文件中的sentinel-datasource-apollo依赖的范围test注释掉
3. 修改apollo包下面的ApolloConfig类，修改apollo的地址和token （获取apollotoken的方式在第"四"步）
4. 修改apollo包下面的FlowRuleApolloProvider类，修改apollo的appid和命名空间，都根据实际情况修改即可
5. 修改apollo包下面的FlowRuleApolloPublisher类，修改apollo的appid和命名空间，都根据实际情况修改即可
6. 修改controller-v2包下面的FlowControllerV2类，修改注入的规则了为apollo的

通过以上调整，sentinel-dashboard控制台的包调整完成，重新打包部署就可以了，下面展示apollo中的配置

移动apollo包
注释掉依赖的test
修改apollo地址和token
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二、apollo配置

spring.application.name = SentinelService
spring.cloud.sentinel.transport.dashboard = localhost:39999
spring.cloud.sentinel.log.dir = /logs

flowRules = [{"app":"SentinelService","clusterMode":false,"controlBehavior":0,"count":1,"gmtModified":1596855658214,"grade":1,"id":1,"limitApp":"default","resource":"/getMethod","strategy":0}]
degrades = [{"resource": "/getMethod","count": 50,"timeWindow": 5,"grade": 0},{"resource": "/getMethod","count": 5,"timeWindow": 8,"grade": 2},{"resource": "/erro","count": 0.5,"timeWindow": 5,"grade": 1}]
authoritys = [{"resource": "/getMethod","limitApp": "192.168.12.215","strategy": 1}]
paramflows = [{"resource": "/getMethod","grade": 1,"paramIdx": 1,"count": 10,"paramFlowItemList": []}]
systems = [{"qps": 20}]

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三、客户端服务配置

客户端服务需添加的依赖：
pom文件配置

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
            <version>2021.0.1.0</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-apollo</artifactId>
           <version>1.8.3</version>
            <exclusions>
                <exclusion>
                    <groupId>com.alibaba.csp</groupId>
                    <artifactId>sentinel-datasource-extension</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.alibaba.csp</groupId>
                    <artifactId>sentinel-core</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

yml文件配置

#Apollo配置
app:
  id: hse-backend2.0.0
apollo:
  meta: http://127.0.0.1:8080/
  bootstrap:
    enabled: true
    namespaces: sino-sentinel
env: dev

server:
  port: 39000

###应用编码配置
appCode: SentinelService

spring:
  application.name: SentinelService
  cloud:
    sentinel:
      log:
        dir: /logs
        switch-pid: true
      transport:
        dashboard: 127.0.0.1:39999
      datasource:
        flow: # 流控规则
          apollo:
            namespaceName: sino-sentinel
            flowRulesKey: flowRules
            rule-type: flow  #flow,degrade,authority,system, param-flow
        degrade: # 熔断降级规则
          apollo:
            namespaceName: sino-sentinel
            flowRulesKey: degrades
            rule-type: degrade
        authority: # 授权规则  未验证,官方不推荐
          apollo:
            namespaceName: sino-sentinel
            flowRulesKey: authoritys
            rule-type: authority
        system: # 系统规则
          apollo:
            namespaceName: sino-sentinel
            flowRulesKey: systems
            rule-type: system
        param-flow: # 热点规则
          apollo:
            namespaceName: sino-sentinel
            flowRulesKey: paramflows
            rule-type: param-flow

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四、获取apollo第三方接入的token

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五、查看结果

将sentinel控制台启动，apollo服务启动及配置完成，客户端服务启动。然后访问客户端服务的接口，即可在sentinel控制台看到对应的接口访问数据，同时也可以看到对应的流控规则等其他在apollo配置的规则，也在sentinel控制台上展示出来了

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