从eureka注册中心平滑迁移，从而解决eureka上下线痛点
- 集成eureka与nacos client
- 注册: 支持同时向多个注册中心注册本机
- 获取实例列表: 支持实时切换注册中心进行获取
.
├── MultiDiscoveryManager.java 多个注册中心client注册、销毁、实例列表获取封装
├── discovry
│ ├── DiscoveryWrapper.java client抽象interface
│ ├── MultiDiscoveryAutoConfiguration.java client自启动配置
│ ├── config
│ │ └── EurekaInstanceConfig.java eureka-client启动配置类
│ ├── impl
│ │ ├── EurekaDiscovery.java eureka-client对DiscoveryWrapper的实现
│ │ └── NacosDiscovery.java nacos-client对DiscoveryWrapper的实现
│ └── properties
│ └── MetaDataProperties.java 启动通用信息封装
├── model
│ └── InstanceWrapperObj.java 实例信息通用封装
├── ribbon
│ ├── MultiDiscoveryRibbonAutoConfiguration.java ribbon 自启动配置
│ ├── MultiDiscoveryRibbonClientConfiguration.java ribbon-client配置类
│ ├── rule
│ │ └── RealTimeRoundRobinRule.java 自定义的实时切换注册中心的轮询规则
│ └── serverList
│ └── MultiDiscoveryServerList.java ribbon启动时serverList实现
└── util
├── HostInfoUtils.java 本机host信息工具类
└── PropertyUtil.java 配置文件读取属性工具类
- 关注各个注册中心client的注册、订阅、关闭的核心能力，同时各个注册中心client实现时都做了cache所以封装时不需要再封装一层cache
- 自定义loadBalanceRule，绕过ribbon的cache
- 利用spring的spi机制，在spring.factories中定义集成的client
eureka有7秒的延迟
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
<version>2.1.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
<version>2.1.5.RELEASE</version>
</dependency>
<dependency>
<groupId>com.boom</groupId>
<artifactId>mutil-discovry-ribbon</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>server:
port: 8899
spring:
application:
name: metirc-parser
discovery:
multi:
#开启功能
enabled: true
eureka:
#开启eureka
enabled: true
address: http://127.0.0.1:8700/eureka
#拉取实例列表的优先级,值越大优先级越高
priority: 1
#是否注册自身
register: false
#eureka刷新cache的延迟(秒)
refresh-interval: 2
nacos:
enabled: true
address: 127.0.0.1:8848
priority: 2
register: false<dependency>
<groupId>com.boom</groupId>
<artifactId>mutil-discovry-ribbon</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>server:
port: 8899
spring:
application:
name: metirc-parser
discovery:
multi:
enabled: true
eureka:
enabled: true
address: http://127.0.0.1:8700/eureka
priority: 1
#注册自身
register: true
nacos:
enabled: true
address: 127.0.0.1:8848
priority: 2
register: trueimport java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import javax.annotation.Resource;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import com.alibaba.nacos.api.exception.NacosException;
import com.alibaba.nacos.api.naming.NamingService;
import com.boom.MultiDiscoveryManager;
import com.netflix.discovery.EurekaClient;
import com.self.feign.FileFeign;
import feign.Param;
@RestController
public class TestController {
@Resource
private FileFeign fileFeign;
@Resource
private MultiDiscoveryManager multiDiscoveryManager;
@GetMapping(path = "/test")
public String test() {
return fileFeign.test();
}
/**
* 获取实例列表
* @param name 注册的应用名称
*/
@GetMapping(path = "/test2")
public List<String> test2(String name) {
Object client = multiDiscoveryManager.getClient(name);
if (client instanceof EurekaClient) {
return ((EurekaClient) client).getApplication("metirc-parser").getInstances()
.stream().map(item -> item.getIPAddr() + ":" + item.getPort())
.collect(Collectors.toList());
} else {
try {
return ((NamingService) client).selectInstances("metirc-parser", true)
.stream().map(item -> item.getIp() + ":" + item.getPort())
.collect(Collectors.toList());
} catch (NacosException e) {
e.printStackTrace();
}
}
return Collections.emptyList();
}
/**
* 切换获取实例列表的注册中心
* @param p nacos/eureka
*/
@GetMapping("/change")
public String change(@Param("p") String p) {
MultiDiscoveryManager.setEnforceClientKey(p);
return "ok";
}
}#!/bin/bash
while true
do
echo -e "\n$(date "+%Y-%m-%d %H:%M:%S")\nnacos"
curl 'http://127.0.0.1:7788/test2?name=nacos'
echo -e '\neureka:'
curl 'http://127.0.0.1:7788/test2?name=eureka'
sleep 1
done