Eureka默認集成了Ribbon，所以Ribbon的灰度實現原理就是借助服務注冊到Eureka中的eureka.instance.metadata-map的內容來進行匹配的。
Zuul網關的灰度實現也是借助了一個Ribbon的插件來實現，相對比較簡單。
項目環境說明：有兩個eureka的服務端(eureka-server)，有兩個相同的后端服務(service-sms)，有一個網關服務(cloud-zuul)。
1、網關的依賴：
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<?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>2.3.9.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> |
這里我們用到的就是io.jmnarloch.ribbon-discovery-filter-spring-cloud-starter 這個插件包。需要注意的是，這個包引入之后，eureka-client自身帶的ribbon很多功能就被覆蓋了，而且不能再自定義IRule規則。因為這個包里面會生成一個metadataAwareRule的IRule，因為spring默認是單例，所以如果再自定義IRule會出現沖突運行時報錯。
2、配置application.yaml
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server: port: 9100spring: 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 |
說明： 我的eureka服務端是部署在域名eureka-7900端口7900。
3、springboot啟動類中添加@EnableZuulProxy
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@SpringBootApplication@EnableZuulProxypublic class CloudZuulApplication { public static void main(String[] args) { SpringApplication.run(CloudZuulApplication.class, args); }} |
4、添加灰度過濾器
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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@Componentpublic class GrayFilter extends ZuulFilter { @Override public String filterType() { return FilterConstants.ROUTE_TYPE; } @Override public int filterOrder() { return 0; } @Override public boolean shouldFilter() { //必須返回true，否則過濾器不起作用 return true; } @SuppressWarnings("SpringJavaInjectionPointsAutowiringInspection") @Autowired private CommonGrayRuleDao commonGrayRuleDao; @Override public Object run() throws ZuulException { //模擬從數據庫中獲取灰度規則配置，此處根據id獲取的，實際項目中可以從數據庫查處所有放到緩存 CommonGrayRule commonGrayRule = commonGrayRuleDao.selectByPrimaryKey(1); RequestContext currentContext = RequestContext.getCurrentContext(); HttpServletRequest request = currentContext.getRequest(); int userId = Integer.parseInt(request.getHeader("userId")); //從head中拿出userid，根據數據庫中規則進行匹配，如果灰度規則中有這個用戶就走灰度v1版本，此處模擬的是根據 //某一個具體的id獲取的值，實際根據情況來定，實際情況中灰度規則也不一定是根據用戶來 if(commonGrayRule.getId() == userId){ //核心代碼就這么一行，實現了灰度，這里的version與要訪問的服務的metadata-map中的key和value進行對應 RibbonFilterContextHolder.getCurrentContext().add("version","v1"); } return null; }} |
至此通過網關訪問service-sms服務就可以了。如果head中添加version就可以指定到具體服務上。
事前說明：兩個service-sms服務的application.yaml文件如下：
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spring: profiles: sms1 application: name: service-smsserver: port: 8001eureka: client: service-url: defaultZone: http://eureka-7900:7900/eureka/ instance: metadata-map: version: v1 ---spring: profiles: sms2 application: name: service-smsserver: port: 8002eureka: client: service-url: defaultZone: http://eureka-7900:7900/eureka/ instance: metadata-map: version: v2 |
因為本機測試，所以使用的是profiles進行區分。
可以看到一個metadata-map設置的是version: v1 ，另一個是version: v2。
當我們數據庫添加一條用戶id是1的數據時，我們通過網關訪問服務的時候，head里面添加userId為1的內容，那么這個用戶為1的請求就會一直走sms1這個服務，否則會在sms1和sms2中輪詢切換。
以上就是淺談Spring Cloud Netflix-Ribbon灰度方案之Zuul網關灰度的詳細內容，更多關于Ribbon灰度方案之Zuul網關灰度的資料請關注服務器之家其它相關文章！
原文鏈接：https://blog.csdn.net/sdmanooo/article/details/115479360
