ribbon灰度发布极简方式

背景：使用ribbon完成 服务->服务 的灰度发布

思路：不同的用户根据ribbon的rule规则匹配到不同的服务

服务调用者api-passenger

pom.xml配置

<?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>2.2.7.RELEASE</version>
        <relativePath/> 
    </parent>
    <groupId>com.dandan</groupId>
    <artifactId>api-passenger</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>api-passenger</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.SR4</spring-cloud.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
         <!-- 实现通过 metadata 进行灰度路由 -->
        <dependency>
            <groupId>io.jmnarloch</groupId>
            <artifactId>ribbon-discovery-filter-spring-cloud-starter</artifactId>
            <version>2.1.0</version>
        </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跟上文一致

启动类ApiPassengerApplication 

package com.dandan.apipassenger;

import com.dandan.apipassenger.gray.GrayRibbonConfiguration;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.ribbon.RibbonClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
public class ApiPassengerApplication {

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

    @LoadBalanced
    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

controller请求类

package com.dandan.apipassenger.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@RequestMapping("/test")
public class TestCallServiceSmsController {

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/call")
    public String testCall(){

        return restTemplate.getForObject("http://service-sms/test/sms-test",String.class);
    }
}

AOP拦截器类 RequestAspect

package com.dandan.apipassenger.gray;

import io.jmnarloch.spring.cloud.ribbon.support.RibbonFilterContextHolder;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**
 * ribbon的灰度发布简单方式
 */
@Aspect
@Component
public class RequestAspect_2 {

    @Pointcut("execution(* com.dandan.apipassenger.controller..*Controller*.*(..))")
    private void anyMehtod(){

    }

    @Before(value = "anyMehtod()")
    public void before(JoinPoint joinPoint){

        HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
        String version = request.getHeader("version");

        //灰度规则匹配的地方，查db,redis...
        if(version.trim().equals("v1")) {
            RibbonFilterContextHolder.getCurrentContext().add("version", "v1");
        } else if(version.trim().equals("v2")) {
            RibbonFilterContextHolder.getCurrentContext().add("version", "v2");
        }
    }
}

service-sms和cloud-eureka配置跟 使用网关zuul完成灰度发布 一致

配置完成后启动

cloud-eureka
api-passenger
service-sms（开启两个服务）

访问 

GET localhost:8080/test/call
header传参:{version:v1}
对应找到service-sms：8091

GET localhost:8080/test/call
header传参:{version:v2}
对应找到service-sms：8092