SpringCloud（四）--Feign&Turbine

时间 2020-12-03

标签 java web spring shell express apache 缓存服务器并发 mvc 栏目 Java 繁體版

原文原文链接

Feign

集成工具(功能整合)java

远程调用：声明式客户端
ribbon 负载均衡和重试
hystrix 降级和熔断

feign 声明式客户端接口

微服务应用中，ribbon 和 hystrix 老是同时出现，feign 整合了二者，并提供了声明式消费者客户端web

用 feign 代替 hystrix+ribbon

只须要声明一个抽象接口，就能够经过接口作远程调用，不须要再使用 RestTemplate 来调用spring

// 调用远程的商品服务，获取订单的商品列表
// 经过注解，配置：
// 1. 调用哪一个服务
// 2. 调用服务的哪一个路径
// 3. 向路径提交什么参数数据
@FeignClient(name="item-service")
public interface ItemClient {
 @GetMapping("/{orderId}")
 JsonResult<List<Item>> getItems(@PathVariable String orderId);
}

在这里使用 @GetMapping("/{orderId}")，指定的是向远程服务调用的路径shell

新建 sp09-feign 项目

pom.xml

须要添加 sp01-commons 依赖

application.yml

spring:
  application:
    name: feign
    
server:
  port: 3001
  
eureka:
  client:
    service-url:
      defaultZone: http://eureka1:2001/eureka, http://eureka2:2002/eureka

主程序添加 `@EnableDiscoveryClient` 和 `@EnableFeignClients`

package cn.tedu.sp09;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class Sp09FeignApplication {

    public static void main(String[] args) {
        SpringApplication.run(Sp09FeignApplication.class, args);
    }
}

feign 声明式客户端

feign 利用了熟悉的 spring mvc 注解来对接口方法进行设置，下降了咱们的学习成本。
经过这些设置,feign能够拼接后台服务的访问路径和提交的参数
例如：express

@GetMapping("/{userId}/score") 
JsonResult addScore(@PathVariable Integer userId, @RequestParam Integer score);

当这样调用该方法：apache

service.addScore(7, 100);

那么 feign 会向服务器发送请求：缓存

http://用户微服务/7/score?score=100

注意：若是 score 参数名与变量名不一样，须要添加参数名设置：

@GetMapping("/{userId}/score") 
JsonResult addScore(@PathVariable Integer userId, @RequestParam("score") Integer s

ItemClient

package cn.tedu.sp09.feign;

import cn.tedu.sp01.pojo.Item;
import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;

import java.util.List;

//根据服务id，从注册表获得主机地址
@FeignClient(name = "item-service")
public interface ItemClient {//封装了RestTemplate
    @GetMapping("{orderId}")//（反向）将请求拼接发送
    JsonResult<List<Item>> getItems(@PathVariable String orderId);

    @PostMapping("/decreaseNumber")//（反向）将请求拼接发送
    JsonResult<?> decreaseNumber(@RequestBody List<Item> items);
}

UserClient

package cn.tedu.sp09.feign;

import cn.tedu.sp01.pojo.User;
import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.*;


//根据服务id，从注册表获得主机地址
@FeignClient(name = "user-service")
public interface UserClient {//封装了RestTemplate
    @GetMapping("{userId}")//（反向）将请求拼接发送
    JsonResult<User> getUser(@PathVariable Integer userId);

    //....../8/score?score=1000
    @GetMapping("/{userId}/score")//（反向）将请求拼接发送
    JsonResult<?> addScore(@PathVariable Integer userId,
                           @RequestParam Integer score);//@RequestParam 不能省略
}

OrderClient

package cn.tedu.sp09.feign;

import cn.tedu.sp01.pojo.Order;
import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;


//根据服务id，从注册表获得主机地址
@FeignClient(name = "order-service")
public interface OrderClient {//封装了RestTemplate
    @GetMapping("{orderId}")//（反向）将请求拼接发送
    JsonResult<Order> getOrder(@PathVariable String orderId);

    @GetMapping("/")//（反向）将请求拼接发送
    JsonResult<?> addOrder();
}

FeignController

package cn.tedu.sp09.controller;

import cn.tedu.sp01.pojo.Item;
import cn.tedu.sp01.pojo.Order;
import cn.tedu.sp01.pojo.User;
import cn.tedu.sp09.feign.ItemClient;
import cn.tedu.sp09.feign.OrderClient;
import cn.tedu.sp09.feign.UserClient;
import cn.tedu.web.util.JsonResult;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@Slf4j
public class FeignController {
    @Autowired
    private ItemClient itemClient;
    @Autowired
    private UserClient userClient;
    @Autowired
    private OrderClient orderClient;
    //-----------item-service
    @GetMapping("/item-service/{orderId}")
    public JsonResult<List<Item>> getItems(@PathVariable String orderId){
        return itemClient.getItems(orderId);
    }

    @PostMapping("/item-service/decreaseNumber")
    public JsonResult<?> decreaseNumber(@RequestBody List<Item> items){
        return itemClient.decreaseNumber(items);
    }
    //-----------user-service
    @GetMapping("/user-service/{userId}")
    public JsonResult<User> getUser(@PathVariable Integer userId){
        return userClient.getUser(userId);
    }
    @GetMapping("/user-service/{userId}/score")
    public JsonResult<?> addScore(@PathVariable Integer userId,Integer score){
        return userClient.addScore(userId, score);
    }
    //-----------order-service
    @GetMapping("/order-service/{orderId}")
    public JsonResult<Order> getOrder(@PathVariable String orderId){
        return orderClient.getOrder(orderId);
    }
    @GetMapping("/order-service")
    public JsonResult<?> addOrder(){
        return orderClient.addOrder();
    }
}

调用流程

启动服务，并访问测试

http://eureka1:2001
http://localhost:3001/item-service/35
http://localhost:3001/item-service/decreaseNumber
使用postman，POST发送如下格式数据：
[{"id":1, "name":"abc", "number":23},{"id":2, "name":"def", "number":11}]
http://localhost:3001/user-service/7
http://localhost:3001/user-service/7/score?score=100
http://localhost:3001/order-service/123abc
http://localhost:3001/order-service/

Feign 集成 Ribbon 负载均衡和重试

无需额外配置，feign 默认已启用了 ribbon 负载均衡和重试机制。能够经过配置对参数进行调整

重试的默认配置参数:服务器

ConnectTimeout=1000
ReadTimeout=1000
MaxAutoRetries=0
MaxAutoRetriesNextServer=1

application.yml 配置 ribbon 超时和重试

ribbon.xxx 全局配置
item-service.ribbon.xxx 对特定服务实例的配置

spring:
  application:
    name: feign
server:
  port: 3001
eureka:
  client:
    service-url:
      defaultZone: http://eureka1:2001/eureka,http://eureka2:2002/eureka
# 调整 ribbon 的重试次数
# 针对全部服务的通用配置
ribbon:
  MaxAutoRetries: 1
  MaxAutoRetriesNextServer: 2
  ConnectTimeout: 1000
  ReadTimeout: 500
#只针对 item-service这一个服务有效，对其它服务不该用这个配置
item-service:
  ribbon:
    MaxAutoRetries: 2

启动服务，访问测试

http://localhost:3001/item-service/35并发

Feign 集成 Hystrix降级和熔断

Feign默认不启用Hystrix，使用feign时不推荐启用Hystrixmvc

启用Hystrix基础配置：

hystrix起步依赖
yml中配置启用hystrix
启动类添加注解 @EnableCircuitBreaker

application.yml 添加配置

feign:
  hystrix:
    enabled: true

添加配置，暂时减少降级超时时间，以便后续对降级进行测试

......

feign:
  hystrix:
    enabled: true
    
hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 500

feign + hystrix 降级

feign 远程接口中指定降级类

ItemFeignService

...
@FeignClient(name="item-service", fallback = ItemFeignServiceFB.class)
public interface ItemFeignService {
...

UserFeignService

...
@FeignClient(name="user-service", fallback = UserFeignServiceFB.class)
public interface UserFeignService {
...

OrderFeignService

...
@FeignClient(name="order-service",fallback = OrderFeignServiceFB.class)
public interface OrderFeignService {
...

降级类

降级类须要实现声明式客户端接口，在实现的抽象方法中添加降级代码，
降级类须要添加 @Component 注解

ItemFeignServiceFB

package cn.tedu.sp09.service;

import java.util.List;
import org.springframework.stereotype.Component;
import cn.tedu.sp01.pojo.Item;
import cn.tedu.web.util.JsonResult;

@Component
public class ItemFeignServiceFB implements ItemFeignService {

    @Override
    public JsonResult<List<Item>> getItems(String orderId) {
        return JsonResult.err("没法获取订单商品列表");
    }

    @Override
    public JsonResult decreaseNumber(List<Item> items) {
        return JsonResult.err("没法修改商品库存");
    }
}

UserFeignServiceFB

package cn.tedu.sp09.service;

import org.springframework.stereotype.Component;
import cn.tedu.sp01.pojo.User;
import cn.tedu.web.util.JsonResult;

@Component
public class UserFeignServiceFB implements UserFeignService {

    @Override
    public JsonResult<User> getUser(Integer userId) {
        return JsonResult.err("没法获取用户信息");
    }

    @Override
    public JsonResult addScore(Integer userId, Integer score) {
        return JsonResult.err("没法增长用户积分");
    }
}

OrderFeignServiceFB

package cn.tedu.sp09.service;

import org.springframework.stereotype.Component;
import cn.tedu.sp01.pojo.Order;
import cn.tedu.web.util.JsonResult;

@Component
public class OrderFeignServiceFB implements OrderFeignService {

    @Override
    public JsonResult<Order> getOrder(String orderId) {
        return JsonResult.err("没法获取商品订单");
    }

    @Override
    public JsonResult addOrder() {
        return JsonResult.err("没法保存订单");
    }
}

启动服务，访问测试

http://localhost:3001/item-service/35

feign + hystrix 监控和熔断测试

修改sp09-feign项目

pom.xml 添加 hystrix 起步依赖

feign 没有包含完整的 hystrix 依赖
右键点击项目,编辑起步依赖,添加hystrix依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>

主程序添加 `@EnableCircuitBreaker`

package cn.tedu.sp09;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableCircuitBreaker
@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class Sp09FeignApplication {

    public static void main(String[] args) {
        SpringApplication.run(Sp09FeignApplication.class, args);
    }
}

sp09-feign 配置 actuator，暴露 `hystrix.stream` 监控端点

actuator 依赖

查看pom.xml, 确认已经添加了 actuator 依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

application.yml 暴露 `hystrix.stream` 端点

management:
  endpoints:
    web:
      exposure:
        include: hystrix.stream

启动服务，查看监控端点

http://localhost:3001/actuator

hystrix dashboard

启动 hystrix dashboard 服务，填入 feign 监控路径，开启监控
访问 http://localhost:4001/hystrix

填入 feign 监控路径:
http://localhost:3001/actuator/hystrix.stream
访问微服务，以产生监控数据

http://localhost:3001/item-service/35

http://localhost:3001/user-service/7
http://localhost:3001/user-service/7/score?score=100

http://localhost:3001/order-service/123abc
http://localhost:3001/order-service/

熔断测试

用 ab 工具，以并发50次，来发送20000个请求

`ab -n 20000 -c 50 http://localhost:3001/item-service/35`

断路器状态为 Open，全部请求会被短路，直接降级执行 fallback 方法

order service 调用商品库存服务和用户服务

sp09-feign项目关闭,再也不使用

修改 sp04-orderservice 项目，添加 feign，调用 item service 和 user service

pom.xml
application.yml
主程序
ItemFeignService
UserFeignService
ItemFeignServiceFB
UserFeignServiceFB
OrderServiceImpl

pom.xml

右键点击项目编辑起步依赖,添加如下依赖：
actuator
feign
hystrix

application.yml

ribbon 重试和 hystrix 超时这里没有设置，采用了默认值

spring:
  application:
    name: order-service
    
server:
  port: 8201  
  
eureka:
  client:
    service-url:
      defaultZone: http://eureka1:2001/eureka, http://eureka2:2002/eureka
      
feign:
  hystrix:
    enabled: true
    
management:
  endpoints:
    web:
      exposure:
        include: hystrix.stream

主程序

package cn.tedu.sp04;

import org.springframework.boot.SpringApplication;
import org.springframework.cloud.client.SpringCloudApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;

//@EnableDiscoveryClient
//@SpringBootApplication

@EnableFeignClients
@SpringCloudApplication
public class Sp04OrderserviceApplication {

    public static void main(String[] args) {
        SpringApplication.run(Sp04OrderserviceApplication.class, args);
    }
}

ItemFeignService

package cn.tedu.sp04.order.feignclient;

import java.util.List;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;

import cn.tedu.sp01.pojo.Item;
import cn.tedu.web.util.JsonResult;

@FeignClient(name="item-service", fallback = ItemFeignServiceFB.class)
public interface ItemFeignService {
    @GetMapping("/{orderId}")
    JsonResult<List<Item>> getItems(@PathVariable String orderId);

    @PostMapping("/decreaseNumber")
    JsonResult decreaseNumber(@RequestBody List<Item> items);
}

UserFeignService

package cn.tedu.sp04.order.feignclient;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;

import cn.tedu.sp01.pojo.User;
import cn.tedu.web.util.JsonResult;

@FeignClient(name="user-service", fallback = UserFeignServiceFB.class)
public interface UserFeignService {
    @GetMapping("/{userId}")
    JsonResult<User> getUser(@PathVariable Integer userId);

    @GetMapping("/{userId}/score") 
    JsonResult addScore(@PathVariable Integer userId, @RequestParam Integer score);
}

ItemFeignServiceFB

获取商品列表的降级方法，模拟使用缓存数据

package cn.tedu.sp04.order.feignclient;

import java.util.Arrays;
import java.util.List;

import org.springframework.stereotype.Component;

import cn.tedu.sp01.pojo.Item;
import cn.tedu.web.util.JsonResult;

@Component
public class ItemFeignServiceFB implements ItemFeignService {

    @Override
    public JsonResult<List<Item>> getItems(String orderId) {
        if(Math.random()<0.5) {
            return JsonResult.ok().data(
            
                Arrays.asList(new Item[] {
                        new Item(1,"缓存aaa",2),
                        new Item(2,"缓存bbb",1),
                        new Item(3,"缓存ccc",3),
                        new Item(4,"缓存ddd",1),
                        new Item(5,"缓存eee",5)
                })
            
            );
        }
        return JsonResult.err("没法获取订单商品列表");
    }

    @Override
    public JsonResult decreaseNumber(List<Item> items) {
        return JsonResult.err("没法修改商品库存");
    }

}

UserFeignServiceFB

获取用户信息的降级方法，模拟使用缓存数据

package cn.tedu.sp04.order.feignclient;

import org.springframework.stereotype.Component;

import cn.tedu.sp01.pojo.User;
import cn.tedu.web.util.JsonResult;

@Component
public class UserFeignServiceFB implements UserFeignService {

    @Override
    public JsonResult<User> getUser(Integer userId) {
        if(Math.random()<0.4) {
            return JsonResult.ok(new User(userId, "缓存name"+userId, "缓存pwd"+userId));
        }
        return JsonResult.err("没法获取用户信息");
    }

    @Override
    public JsonResult addScore(Integer userId, Integer score) {
        return JsonResult.err("没法增长用户积分");
    }

}

OrderServiceImpl

package cn.tedu.sp04.order.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import cn.tedu.sp01.pojo.Item;
import cn.tedu.sp01.pojo.Order;
import cn.tedu.sp01.pojo.User;
import cn.tedu.sp01.service.OrderService;
import cn.tedu.sp04.order.feignclient.ItemFeignService;
import cn.tedu.sp04.order.feignclient.UserFeignService;
import cn.tedu.web.util.JsonResult;

import lombok.extern.slf4j.Slf4j;

@Slf4j
@Service
public class OrderServiceImpl implements OrderService {
    
    @Autowired
    private ItemFeignService itemService;
    @Autowired
    private UserFeignService userService;

    @Override
    public Order getOrder(String orderId) {
        //调用user-service获取用户信息
        JsonResult<User> user = userService.getUser(7);
        
        //调用item-service获取商品信息
        JsonResult<List<Item>> items = itemService.getItems(orderId);
        
        
        Order order = new Order();
        order.setId(orderId);
        order.setUser(user.getData());
        order.setItems(items.getData());
        return order;
    }

    @Override
    public void addOrder(Order order) {
        //调用item-service减小商品库存
        itemService.decreaseNumber(order.getItems());
        
        //TODO: 调用user-service增长用户积分
        userService.addScore(7, 100);
        
        log.info("保存订单："+order);
    }

}

order-service 配置启动参数,启动两台服务器

--server.port=8201
--server.port=8202

Turbine

hystrix + turbine 集群聚合监控

hystrix dashboard 一次只能监控一个服务实例，使用 turbine 能够聚集监控信息，将聚合后的信息提供给 hystrix dashboard 来集中展现和监控

新建 sp10-turbine 项目

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>cn.tedu</groupId>
    <artifactId>sp10-turbine</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>sp10-turbine</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.RELEASE</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-turbine</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

spring:
  application:
    name: turbin
    
server:
  port: 5001
  
eureka:
  client:
    service-url:
      defaultZone: http://eureka1:2001/eureka, http://eureka2:2002/eureka
      
turbine:
  app-config: order-service
  cluster-name-expression: new String("default")

主程序

添加 @EnableTurbine 和 @EnableDiscoveryClient 注解

package cn.tedu.sp10;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.turbine.EnableTurbine;

@EnableTurbine
@EnableDiscoveryClient
@SpringBootApplication
public class Sp10TurbineApplication {

    public static void main(String[] args) {
        SpringApplication.run(Sp10TurbineApplication.class, args);
    }

}

访问测试

8201服务器产生监控数据:
http://localhost:8201/abc123
http://localhost:8201/
8202服务器产生监控数据:
http://localhost:8202/abc123
http://localhost:8202/
turbine 监控路径
http://localhost:5001/turbine.stream
在 hystrix dashboard 中填入turbine 监控路径，开启监控
http://localhost:4001/hystrix
turbine聚合了order-service两台服务器的hystrix监控信息

SpringCloud（四）--Feign&Turbine

Feign

feign 声明式客户端接口

新建 sp09-feign 项目

pom.xml

application.yml

主程序添加 @EnableDiscoveryClient 和 @EnableFeignClients

feign 声明式客户端

ItemClient

UserClient

OrderClient

FeignController

调用流程

启动服务，并访问测试

Feign 集成 Ribbon 负载均衡和重试

application.yml 配置 ribbon 超时和重试

启动服务，访问测试

Feign 集成 Hystrix降级和熔断

application.yml 添加配置

添加配置，暂时减少降级超时时间，以便后续对降级进行测试

feign + hystrix 降级

feign 远程接口中指定降级类

ItemFeignService

UserFeignService

OrderFeignService

降级类

ItemFeignServiceFB

UserFeignServiceFB

OrderFeignServiceFB

启动服务，访问测试

feign + hystrix 监控和熔断测试

修改sp09-feign项目

pom.xml 添加 hystrix 起步依赖

主程序添加 @EnableCircuitBreaker

sp09-feign 配置 actuator，暴露 hystrix.stream 监控端点

actuator 依赖

application.yml 暴露 hystrix.stream 端点

启动服务，查看监控端点

hystrix dashboard

熔断测试

order service 调用商品库存服务和用户服务

修改 sp04-orderservice 项目，添加 feign，调用 item service 和 user service

pom.xml

application.yml

主程序

ItemFeignService

UserFeignService

ItemFeignServiceFB

UserFeignServiceFB

OrderServiceImpl

order-service 配置启动参数,启动两台服务器

启动服务，访问测试

hystrix dashboard 监控 order service 断路器

hystrix dashboard 监控 order service 断路器

Turbine

hystrix + turbine 集群聚合监控

新建 sp10-turbine 项目

pom.xml

application.yml

主程序

访问测试

主程序添加 `@EnableDiscoveryClient` 和 `@EnableFeignClients`

主程序添加 `@EnableCircuitBreaker`

sp09-feign 配置 actuator，暴露 `hystrix.stream` 监控端点

application.yml 暴露 `hystrix.stream` 端点