【Spring Cloud Alibaba】【Hoxton】Sentinel 热点规则-@SentinelResource-熔断-持久化（二）

ゝ一纸荒年。 2023-05-28 14:20 7阅读 0赞

[1 Nacos 入门-配置中心-集群][1 Nacos _-_-]  
[2 Sentinel 入门-限流-降级（一）][2 Sentinel _-_-]  
[3 Sentinel 热点规则-@SentinelResource-熔断-持久化（二）][3 Sentinel _-_SentinelResource-_-]  
[4 Seata从入门到实战][1 Nacos _-_-]

# 1 热点参数限流 #

何为热点？热点即经常访问的数据。很多时候我们希望统计某个热点数据中访问频次最高的 Top K 数据，并对其访问进行限制。比如：

*  商品 ID 为参数，统计一段时间内最常购买的商品 ID 并进行限制
 *  用户 ID 为参数，针对一段时间内频繁访问的用户 ID 进行限制  
    热点参数限流会统计传入参数中的热点参数，并根据配置的限流阈值与模式，对包含热点参数的资源调用进行限流。热点参数限流可以看做是一种特殊的流量控制，仅对包含热点参数的资源调用生效。  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70]

## 1.1 新建Controller ##

@RestController
    public class HotkeyController { 
        /** * SentinelResource: sentinel相关配置，value唯一，blockHandler回调方法 */
        @GetMapping("/hotkey")
        @SentinelResource(value = "hotkey",blockHandler = "dealHotkey")
        public String hotkey(@RequestParam(value = "key",required = false) String key){ 
            return "hello hotkey, O(∩_∩)O";
        }
        public String dealHotkey(String key, BlockException e){ 
            return "调用失败, o(╥﹏╥)o";
        }
    }

## 1.2 新建热点规则 ##

解释：资源名为@SentinelResource的value值，阈值是qp的值，统计时长是发生后1秒内降级。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 1]

## 1.3 测试 ##

随便调用：http://localhost:9004/hotkey  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 2]  
调用http://localhost:9004/hotkey?key=sentinel频繁时：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 3]

## 1.4 参数例外项 ##

期望当key为phone时qps为100，剩下的为1  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 4]

狂点后仍然返回正确的行为：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 5]

# 2 @SentinelResource #

## 2.1 按资源名称添加流控规则 ##

(1) 创建Controller

(2) 新建流控规则  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 6]  
(3) 刷新频繁会出现  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 7]

## 2.2 自定义异常返回类 ##

(1) 自定义handler

public class ZrsBlockHandler { 
        public static String handler1Exception(BlockException exception){ 
            return  "ZrsBlockHandler invoke handler【1】Exception";
        }
        public static String handler2Exception(BlockException exception){ 
            return  "ZrsBlockHandler invoke handler【2】Exception";
        }
    }

(2) 修改SentinelResourceController

@RestController
    public class SentinelResourceController { 
        @GetMapping("/resource")
        @SentinelResource(value = "resource",blockHandler = "handleException")
        public String resource(){ 
            return "SentinelResourceController invoke resource success";
        }
        public String handleException(BlockException e){ 
            return "SentinelResourceController invoke handleException";
        }
        @GetMapping("/handler1")
        @SentinelResource(value = "handler1Exception",blockHandlerClass = ZrsBlockHandler.class,
        blockHandler = "handler1Exception")
        public String handler1(){ 
            return "SentinelResourceController invoke resource success";
        }
    
        @GetMapping("/handler2")
        @SentinelResource(value = "handler2Exception",blockHandlerClass = ZrsBlockHandler.class,
                blockHandler = "handler2Exception")
        public String handler2(){ 
            return "SentinelResourceController invoke resource success";
        }
    }

(3) 启动服务

http://localhost:9004/handler1
    http://localhost:9004/handler2

(4) 添加流控规则  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 8]  
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(5) 频繁访问  
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# 3 熔断 #

## 3.1 环境准备 ##

(1) 初始化环境

#代码为【Spring Cloud Alibaba】【Hoxton】Nacos 入门-配置中心-集群。文章中的代码，或者直接访问该文章底部的github
    #文章机票为https://blog.csdn.net/qq_34125999/article/details/104934796
    provider，服务名provider，注册到nacos
    provider-slave，服务名provider，注册到nacos
    customer，服务名customer去nacos消费服务

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 13]  
(2)启动环境  
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(3) 测试  
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## 3.2 修改customer程序 ##

(1) 修改pom

<dependencies>
        
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
            <scope>true</scope>
        </dependency>
    </dependencies>

(2) 修改application.yml

server:
      port: 9002
    spring:
      application:
        name: customer
      cloud:
        nacos:
          discovery:
            server-addr: 192.168.0.39:8848
        sentinel:
          transport:
            #配置sentinel地址,端口
            dashboard: 192.168.0.39:8080
            port: 8719
            #客户端IP
            client-ip: 192.168.0.100

(3) 修改CustomerController

@RestController
    @RequestMapping("/customer")
    public class CustomerController { 
        @Autowired
        private RestTemplate restTemplate;
    
        private final String SERVER_URL="http://provider"
    
        @GetMapping(value = "/hello")
        @SentinelResource(value = "hello")
        public String hello(){ 
            return restTemplate.getForObject(SERVER_URL+"/provider/hello", String.class);
        }
    }

(4) 启动主程序后访问

http://localhost:9002/customer/hello

(5) 查看sentinel页面  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 17]

## 3.3 fallback ##

(1) 修改CustomerController

@RestController
    @RequestMapping("/customer")
    public class CustomerController { 
        @Autowired
        private RestTemplate restTemplate;
    
        private final String SERVER_URL="http://provider";
    
        @GetMapping(value = "/hello/{id}")
        @SentinelResource(value = "hello",fallback = "fallbackHandler")
        public String hello(@PathVariable("id") String id){ 
            if (id.equals("1")){ 
                throw new RuntimeException("id不能为1");
            }
            return restTemplate.getForObject(SERVER_URL+"/provider/hello", String.class);
        }
    
        public String fallbackHandler(@PathVariable("id") String id ,Throwable e){ 
            return "CustomerController invoke fallbackHandler";
        }
    }

(2) 测试  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 18]

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## 3.4 blockHandler ##

(1) 修改CustomerController，仅配置blockHandler

@RestController
    @RequestMapping("/customer")
    public class CustomerController { 
    
        @Autowired
        private RestTemplate restTemplate;
    
        private final String SERVER_URL="http://provider";
    
        /** * blockHandler：仅负责sentinel违规 */
        @GetMapping(value = "/hello/{id}")
        @SentinelResource(value = "hello",blockHandler = "helloBlockHandler")
        public String hello(@PathVariable("id") String id){ 
            if (id.equals("1")){ 
                throw new RuntimeException("id不能为1");
            }
            return restTemplate.getForObject(SERVER_URL+"/provider/hello", String.class);
        }
        public String fallbackHandler(@PathVariable("id") String id ,Throwable e){ 
            return "CustomerController invoke fallbackHandler";
        }
        public String helloBlockHandler(String id,BlockException e){ 
            return "CustomerController invoke blockHandler";
        }
    }

(2) sentinel配置  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 20]

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(3) 测试

#访问1时直接报错，java没有对应fallback处理
    http://localhost:9002/customer/hello/1
    #当频繁访问，出现限流响应
    http://localhost:9002/customer/hello/2

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 23]  
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## 3.5 fallback、blockHandler同时配置 ##

(1) 修改CustomerController

@RestController
    @RequestMapping("/customer")
    public class CustomerController { 
    
        @Autowired
        private RestTemplate restTemplate;
    
        private final String SERVER_URL="http://provider";
    
        /** * blockHandler：仅负责sentinel违规 */
        @GetMapping(value = "/hello/{id}")
        @SentinelResource(value = "hello",blockHandler = "helloBlockHandler",fallback = "fallbackHandler")
        public String hello(@PathVariable("id") String id){ 
            System.out.println(id);
            if (id.equals("1")){ 
                throw new RuntimeException("id不能为1");
            }
            return restTemplate.getForObject(SERVER_URL+"/provider/hello", String.class);
        }
    
    
        public String fallbackHandler(@PathVariable("id") String id ,Throwable e){ 
            return "CustomerController invoke fallbackHandler";
        }
    
    
        public String helloBlockHandler(String id,BlockException e){ 
            return "CustomerController invoke blockHandler";
        }
    
    
    }

(2) 测试

#java异常fallback->fallbackHandler
    http://localhost:9002/customer/hello/1
    #限流控制->helloBlockHandler
    http://localhost:9002/customer/hello/2

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 25]

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## 3.6 OpenFegin ##

(1) 创建工程  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 27]

(2) pom

<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
            <scope>true</scope>
        </dependency>
    </dependencies>

(3) application.yml

server:
      port: 9005
    spring:
      application:
        name: customer-fegin
      cloud:
        nacos:
          discovery:
            server-addr: 192.168.0.39:8848
        sentinel:
          transport:
            #配置sentinel地址,端口
            dashboard: 192.168.0.39:8080
            port: 8719
            #客户端IP
            client-ip: 192.168.0.100
    #开启sentinel 对fegin的支持
    feign:
      sentinel:
        enabled: true

(4) 主启动类

@EnableFeignClients
    @SpringBootApplication
    @EnableDiscoveryClient
    public class FeginApplication { 
        public static void main(String[] args) { 
            SpringApplication.run(FeginApplication.class);
        }
    }

(5) 降级类

@Service
    public class ProviderServiceFallback implements ProviderService { 
        @Override
        public String hello() { 
            return "ProviderServiceFallback invoke hello";
        }
    }

(6) Fegin服务类

@FeignClient(value = "provider",path = "/provider",fallback = ProviderServiceFallback.class)
    @Service
    public interface ProviderService { 
        @GetMapping("/hello")
        String hello();
    }

(7) Controller

(8) 启动主程序

#报错
    com.alibaba.cloud.sentinel.feign.SentinelContractHolder.parseAndValidateMetadata(Ljava/lang/Class;)
    #解决办法，修改父pomspringcloud版本为Hoxton.SR1。- -，BUG。期待后续解决 - -！！！，修改后重启解决
    <spring-cloud.version>Hoxton.SR1</spring-cloud.version>

![在这里插入图片描述][20200322003052666.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 28]  
(9) 测试  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 29]

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# 4 持久化配置 #

当关闭FeginApplication时，打开sentinel页面  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 31]

## 4.1 修改customer-fegin的application.yml ##

server:
      port: 9005
    spring:
      application:
        name: customer-fegin
      cloud:
        nacos:
          discovery:
            server-addr: 192.168.0.39:8848
        sentinel:
          transport:
            dashboard: 192.168.0.39:8080
            port: 8719
            client-ip: 192.168.0.100
          datasource:
            na:
              nacos:
                server-addr: 192.168.0.39:8848
                groupId: DEFAULT_GROUP
                dataId: customer-fegin
                rule-type: flow
    #开启sentinel 对fegin的支持
    feign:
      sentinel:
        enabled: true

## 4.2 nacos添加配置 ##

(1) 新建配置  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 32]  
(2) json串

[{ 
        "resource": "hello",
        "limitApp": "default",
        "grade": 1,
        "count": 1,
        "strategy": 0,
        "controlBehavior": 0,
        "clusterMode": false
    }]

(3) 参数解析

resource:资源名称;
    IimitApp:来源应用;
    grade:國值类型,0表示线程数,1表示QPS;
    count:单机阈值
    strategy:流控模式,0表示直接,1表示关联,2表示链路
    controlbehavior:流控效果,0表示快速失败,1表示 Warm Up,2表示排队等待;
    cluster Mode:是否集群。

(4) 查看列表  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 33]

## 4.3 修改Controller ##

@RestController
    @RequestMapping("/fegin")
    public class FeginController { 
        @Autowired
        private ProviderService providerService;
    
        @GetMapping("/hello")
        @SentinelResource(value = "hello",blockHandler = "helloBlockHandler")
        public String hello(){ 
            return  providerService.hello();
        }
    
        public String helloBlockHandler(BlockException e){ 
            return "CustomerController invoke blockHandler";
        }
    }

## 4.3 启动主程序 ##

#访问后，查看sentinelhttp://localhost:9005/fegin/hello

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频繁访问后：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 35]

# LAST GITHUB #

#分支Sentinel-release-v1.0
    https://github.com/zhurongsheng666/spring-cloud-alibaba

[1 Nacos _-_-]: https://blog.csdn.net/qq_34125999/article/details/105039301
[2 Sentinel _-_-]: https://blog.csdn.net/qq_34125999/article/details/105009001
[3 Sentinel _-_SentinelResource-_-]: https://blog.csdn.net/qq_34125999/article/details/105020919
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