SpringCloud Alibaba(二) - Sentinel，整合OpenFeign,GateWay服务网关

谁借莪１个温暖的怀抱￠ 2023-09-25 19:23 72阅读 0赞

### 1、环境准备 ###

#### 1.1Nacos ####

单机启动：`startup.cmd -m standalone`

![4acbd115de8af93cadfd555ead7d6f58.png][]

#### 1.2 Sentinel ####

启动命令：`java -Dserver.port=8858 -Dcsp.sentinel.dashboard.server=localhost:8858 -Dproject.name=sentinel-dashboard -jar sentinel-dashboard-1.8.0.jar`

![abb3bfc03e56adab85d841fcc617a75b.png][]

#### 1.3 JMeter ####

![ef8f6f884afd1e03963b6fa7f40951a9.png][]

### 2、流控规则限流 ###

#### 2.0 环境搭建 ####

2.0.1 依赖

<dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>
    
    
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
    </dependency>
    
    
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

2.0.2 application.yml

# 端口
    server:
      port: 9604
    
    # 服务名
    spring:
      application:
        name: kgcmall-sentinel
    
      # 数据源配置
      datasource:
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://localhost:3306/kh96_alibaba_kgcmalldb?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT
        username: root
        password: 17585273765
    
      # jpa配置
      jpa:
        hibernate:
          ddl-auto: update
        show-sql: true
    
      cloud:
        #nacos 配置
        nacos:
          discovery:
            server-addr: 127.0.0.1:8848
    
        #sentinel 配置
        sentinel:
          transport:
            dashboard: 127.0.0.1:8858 # sentinel 控制台地址
            port: 9605 # 客户端(核心应用)和控制台的通信端口，默认8719，子当以一个为被使用的唯一端口即可
          web-context-unify: false #关闭收敛 
    
    # 暴露/actuator/sentinel端点 单独配置，management 开顶格写
    management:
      endpoints:
        web:
          exposure:
            include: '*'

2.0.3 测试

[http://localhost:9604/actuator/sentinel][http_localhost_9604_actuator_sentinel]

![adb04c070c4ac566f6bd267b61f7ad93.png][]

#### 2.1 流控模式 ####

2.1.1 直接模式

2.1.1.1 测试请求

/**
    * @param : [sentinelDesc]
    * @return : java.lang.String
    * @author : huayu
    * @date : 26/11/2022
    * @description : 测试 Sentinel 流控 - 直接失败
    */
    @GetMapping("testSentinelFlowFail")
    public String testSentinelFlowFail(@RequestParam String sentinelDesc) {
        log.info("------ testSentinelFlowFail 接口调用 ------ ");
        return sentinelDesc;
    }

2.1.1.2 添加直接流控规则

2.1.1.2.1 需要先发起异常请求

![a41051930c1c82188352f5e98ac566a4.png][]

2.1.1.2.2 簇点链路 添加流控规则

![b0d7a03467e2a5982627fa4f56853ea5.png][]

2.1.1.2.3 设置流控规则

![84ad5bb5f54d8bc8357faeba5bd2acab.png][]

2.1.1.3查看流控规则

![f9707bc85295457cc337d30dc28f9bbd.png][]

2.1.1.4 测试

![b610aac168b494c3890ba09cb4c2e4f0.png][]

2.1.1.5 自定义sentinel统一已成返回处理

/**
     * Created On : 26/11/2022.
     * <p>
     * Author : huayu
     * <p>
     * Description: 自定义sentinel统一已成返回处理
     */
    @Slf4j
    @Component
    public class MySentinelBlockExceptionHandler implements BlockExceptionHandler {
    
        @Override
        public void handle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, BlockException e) throws Exception {
            // 记录异常日志
            log.warn("------ MySentinelBlockExceptionHandler 规则Rule：{} ------", e.getRule());
    
            // 增加自定义统一异常返回对象
            RequestResult<String> requestResult = null;
    
            // 针对不同的流控异常，统一返回
            if (e instanceof FlowException) {
                requestResult = ResultBuildUtil.fail("9621", "接口流量限流");
            } else if (e instanceof DegradeException) {
                requestResult = ResultBuildUtil.fail("9622", "接口服务降级");
            } else if (e instanceof ParamFlowException) {
                requestResult = ResultBuildUtil.fail("9623", "热点参数限流");
            } else if (e instanceof SystemBlockException) {
                requestResult = ResultBuildUtil.fail("9624", "触发系统保护");
            } else if (e instanceof AuthorityException) {
                requestResult = ResultBuildUtil.fail("9625", "授权规则限制");
            }
    
            // 统一返回json结果
            httpServletResponse.setStatus(HttpStatus.FORBIDDEN.value());
            httpServletResponse.setCharacterEncoding("utf-8");
            httpServletResponse.setContentType(MediaType.APPLICATION_JSON_VALUE);
    
            // 借助SpringMVC自带的Jackson工具，返回结果
            new ObjectMapper().writeValue(httpServletResponse.getWriter(), requestResult);
        }
    
    
    }

2.1.1.6 再次测试

![5b8edcbbe5a4833bee75fa4cad3dde75.png][]

2.1.2 关联模式

2.1.2.1 测试请求

/**
    * @param : [sentinelDesc]
    * @return : java.lang.String
    * @author : huayu
    * @date : 26/11/2022
    * @description : 测试 Sentinel 流控 - 关联
    */
    @GetMapping("testSentinelFlowLink")
    public String testSentinelFlowLink(@RequestParam String sentinelDesc) {
        log.info("------ testSentinelFlowLink 接口调用 ------ ");
        return sentinelDesc;
    }

2.1.1.2 添加关联流控规则

![b666764c0ac753d0dc9cad5d837e644a.png][]

2.1.1.3 JMeter压测配置

2.1.1.3.1 线程组

![25a51cefb07550b6129d088ef83478f2.png][]

2.1.1.3.2 Http请求

![495c8ffc1e0e0eb0bfbebb6ab834edc1.png][]

2.1.1.3.3 测试 testSentinelFlowLink 接口

![9b15b1f291dd2e7b7555bf8ff67b59ef.png][]

2.1.3 链路模式

链路流控模式指的是，当从某个接口过来的资源达到限流条件时，开启限流。它的功能有点类似于针对来源配置项，区别在于：针对来源是针对上级

[4acbd115de8af93cadfd555ead7d6f58.png]: https://img-blog.csdnimg.cn/img_convert/4acbd115de8af93cadfd555ead7d6f58.png
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[http_localhost_9604_actuator_sentinel]: http://localhost:9604/actuator/sentinel
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[f9707bc85295457cc337d30dc28f9bbd.png]: https://img-blog.csdnimg.cn/img_convert/f9707bc85295457cc337d30dc28f9bbd.png
[b610aac168b494c3890ba09cb4c2e4f0.png]: https://img-blog.csdnimg.cn/img_convert/b610aac168b494c3890ba09cb4c2e4f0.png
[5b8edcbbe5a4833bee75fa4cad3dde75.png]: https://img-blog.csdnimg.cn/img_convert/5b8edcbbe5a4833bee75fa4cad3dde75.png
[b666764c0ac753d0dc9cad5d837e644a.png]: https://img-blog.csdnimg.cn/img_convert/b666764c0ac753d0dc9cad5d837e644a.png
[25a51cefb07550b6129d088ef83478f2.png]: https://img-blog.csdnimg.cn/img_convert/25a51cefb07550b6129d088ef83478f2.png
[495c8ffc1e0e0eb0bfbebb6ab834edc1.png]: https://img-blog.csdnimg.cn/img_convert/495c8ffc1e0e0eb0bfbebb6ab834edc1.png
[9b15b1f291dd2e7b7555bf8ff67b59ef.png]: https://img-blog.csdnimg.cn/img_convert/9b15b1f291dd2e7b7555bf8ff67b59ef.png