浅谈Spring Cloud Netflix-Ribbon灰度方案之Zuul网关灰度

eureka默认集成了ribbon，所以ribbon的灰度实现原理就是借助服务注册到eureka中的eureka.instance.metadata-map的内容来进行匹配的。

zuul网关的灰度实现也是借助了一个ribbon的插件来实现，相对比较简单。

项目环境说明：有两个eureka的服务端(eureka-server)，有两个相同的后端服务(service-sms)，有一个网关服务(cloud-zuul)。

1、网关的依赖：

<?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 http://www.51sjk.com/Upload/Articles/1/0/250/250774_20210625002035463.xsd">
    <modelversion>4.0.0</modelversion>
    <parent>
        <groupid>org.springframework.boot</groupid>
        <artifactid>spring-boot-starter-parent</artifactid>
        <version>2.3.9.release</version>
        <relativepath/> <!-- lookup parent from repository -->
    </parent>
    <groupid>com.kevin</groupid>
    <artifactid>cloud-zuul</artifactid>
    <version>0.0.1-snapshot</version>
    <name>cloud-zuul</name>
    <description>demo project for spring boot</description>
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>hoxton.sr10</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>
        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-starter-netflix-zuul</artifactid>
            <version>2.2.7.release</version>
        </dependency>
        <dependency>
            <groupid>io.jmnarloch</groupid>
            <artifactid>ribbon-discovery-filter-spring-cloud-starter</artifactid>
            <version>2.1.0</version>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-data-redis</artifactid>
            <version>2.2.7.release</version>
        </dependency>
        <dependency>
            <groupid>org.projectlombok</groupid>
            <artifactid>lombok</artifactid>
            <optional>true</optional>
        </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>
        <dependency>
            <groupid>org.mybatis.spring.boot</groupid>
            <artifactid>mybatis-spring-boot-starter</artifactid>
            <version>2.1.2</version>
        </dependency>
 
        <dependency>
            <groupid>com.alibaba</groupid>
            <artifactid>druid</artifactid>
            <version>1.1.21</version>
        </dependency>
        <dependency>
            <groupid>mysql</groupid>
            <artifactid>mysql-connector-java</artifactid>
            <version>5.1.48</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>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupid>org.projectlombok</groupid>
                            <artifactid>lombok</artifactid>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
 
</project>

这里我们用到的就是io.jmnarloch.ribbon-discovery-filter-spring-cloud-starter 这个插件包。需要注意的是，这个包引入之后，eureka-client自身带的ribbon很多功能就被覆盖了，而且不能再自定义irule规则。因为这个包里面会生成一个metadataawarerule的irule，因为spring默认是单例，所以如果再自定义irule会出现冲突运行时报错。

2、配置application.yaml

server:
  port: 9100
spring:
  application:
    name: cloud-zuul
  datasource:
    type: com.alibaba.druid.pool.druiddatasource
    driver-class-name: com.mysql.jdbc.driver
    url: jdbc:mysql://localhost:3306/test?characterencoding=utf-8&servertimezone=asia/shanghai
    username: root
    password: root
    dbcp2:
      initial-size: 5
      min-idle: 5
      max-total: 10
      max-wait-millis: 1000
      validation-query: select 1
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
 
eureka:
  client:
    service-url:
      defaultzone: http://eureka-7900:7900/eureka/
mybatis:
  mapper-locations: classpath:mapper/*.xml

说明：我的eureka服务端是部署在域名eureka-7900端口7900。

3、springboot启动类中添加@enablezuulproxy

@springbootapplication
@enablezuulproxy
public class cloudzuulapplication {
 
    public static void main(string[] args) {
        springapplication.run(cloudzuulapplication.class, args);
    }
}

4、添加灰度过滤器

import com.kevin.dao.commongrayruledao;
import com.kevin.entity.commongrayrule;
import com.netflix.zuul.zuulfilter;
import com.netflix.zuul.context.requestcontext;
import com.netflix.zuul.exception.zuulexception;
import io.jmnarloch.spring.cloud.ribbon.support.ribbonfiltercontextholder;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.cloud.netflix.zuul.filters.support.filterconstants;
import org.springframework.stereotype.component;
import javax.servlet.http.httpservletrequest;
 
//加入spring的管理
@component
public class grayfilter extends zuulfilter {
    @override
    public string filtertype() {
        return filterconstants.route_type;
    }
 
    @override
    public int filterorder() {
        return 0;
    }
 
    @override
    public boolean shouldfilter() {
        //必须返回true，否则过滤器不起作用
        return true;
    }
 
    @suppresswarnings("springjavainjectionpointsautowiringinspection")
    @autowired
    private commongrayruledao commongrayruledao;
 
    @override
    public object run() throws zuulexception {
        //模拟从数据库中获取灰度规则配置，此处根据id获取的，实际项目中可以从数据库查处所有放到缓存
        commongrayrule commongrayrule = commongrayruledao.selectbyprimarykey(1);
 
        requestcontext currentcontext = requestcontext.getcurrentcontext();
        httpservletrequest request = currentcontext.getrequest();
        int userid = integer.parseint(request.getheader("userid"));
        //从head中拿出userid，根据数据库中规则进行匹配，如果灰度规则中有这个用户就走灰度v1版本，此处模拟的是根据
        //某一个具体的id获取的值，实际根据情况来定，实际情况中灰度规则也不一定是根据用户来
        if(commongrayrule.getid() == userid){
            //核心代码就这么一行，实现了灰度，这里的version与要访问的服务的metadata-map中的key和value进行对应
            ribbonfiltercontextholder.getcurrentcontext().add("version","v1");
        }
 
        return null;
    }
}

至此通过网关访问service-sms服务就可以了。如果head中添加version就可以指定到具体服务上。

事前说明：两个service-sms服务的application.yaml文件如下：

spring:
  profiles: sms1
  application:
    name: service-sms
server:
  port: 8001
eureka:
  client:
    service-url:
      defaultzone: http://eureka-7900:7900/eureka/
  instance:
    metadata-map:
      version: v1
 
 
---
spring:
  profiles: sms2
  application:
    name: service-sms
server:
  port: 8002
eureka:
  client:
    service-url:
      defaultzone: http://eureka-7900:7900/eureka/
  instance:
    metadata-map:
      version: v2

因为本机测试，所以使用的是profiles进行区分。

可以看到一个metadata-map设置的是version: v1 ，另一个是version: v2。

当我们数据库添加一条用户id是1的数据时，我们通过网关访问服务的时候，head里面添加userid为1的内容，那么这个用户为1的请求就会一直走sms1这个服务，否则会在sms1和sms2中轮询切换。

以上就是浅谈spring cloud netflix-ribbon灰度方案之zuul网关灰度的详细内容，更多关于ribbon灰度方案之zuul网关灰度的资料请关注其它相关文章！