SpringCloud实现灰度发布的方法步骤

        <!-- 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>

@Component
public class GrayFilter extends ZuulFilter {
    @Override
    public String filterType() {
        return FilterConstants.PRE_TYPE;
    }
 
    @Override
    public int filterOrder() {
        return 0;
    }
 
    @Override
    public boolean shouldFilter() {
        return true;//return false 关闭该过滤器
    }
 
    @Autowired
    private CommonGrayRuleDaoCustom commonGrayRuleDaoCustom;
 
    @Override
    public Object run() throws ZuulException {
        RequestContext currentContext = RequestContext.getCurrentContext();
        HttpServletRequest request = currentContext.getRequest();
 
        String userId = request.getHeader("userId");
        // 根据用户id查规则查库，
        String rule = findRuleById(userId);
 
        // 金丝雀
        if ("v1".equals(rule)) {
            RibbonFilterContextHolder.getCurrentContext().add("version", "v1");
            // 普通用户
        } else if ("v2".equals(rule)) {
            RibbonFilterContextHolder.getCurrentContext().add("version", "v2");
        }
 
        return null;
    }
 
    //查库的伪代码
    private String findRuleById(String userId) {
        Map<String, String> map = new HashMap();
        map.put("9527", "v1");
        map.put("9528", "v2");
        return map.get(userId);
    }
 
}

public class RibbonParameters {
    private static final ThreadLocal local = new ThreadLocal();
 
    public static <T> T get() {
        return (T) local.get();
    }
 
    public static <T> void set(T t) {
        local.set(t);
    }
}

@Aspect
@Component
public class RequestAspect {
 
    @Pointcut("execution(* com.mashibing.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");
        //方式二：
        HashMap<Object, Object> map = new HashMap<>();
        map.put("version",version);
        RibbonParameters.set(map);
    }

import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.AbstractLoadBalancerRule;
import com.netflix.loadbalancer.ILoadBalancer;
import com.netflix.loadbalancer.Server;
import com.netflix.niws.loadbalancer.DiscoveryEnabledServer;
import org.springframework.context.annotation.Configuration;
 
import java.util.List;
import java.util.Map;
 
@Configuration
public class GrayRule extends AbstractLoadBalancerRule {
 
    @Override
    public void initWithNiwsConfig(IClientConfig clientConfig) {
    }
 
    @Override
    public Server choose(Object key) {
        return choose(getLoadBalancer(), key);
    }
 
    private Server choose(ILoadBalancer lb, Object key) {
        System.out.println("灰度，rule");
        Server server = null;
        while (server == null) {
            List<Server> reachableServers = lb.getReachableServers();
            //获取当前线程的参数 用户 version=v1
            Map<String, String> map = (Map<String, String>) RibbonParameters.get();
            String version = "";
            if (map != null && map.containsKey("version")) {
                version = map.get("version");
            }
            System.out.println("当前rule,version=" + version);
            //遍历服务列表选取用户服务
            for (int i = 0; i < reachableServers.size(); i++) {
                server = reachableServers.get(i);
                //用户的version知道了，服务自定义的meta不知道
                Map<String, String> metadata = ((DiscoveryEnabledServer) server).getInstanceInfo().getMetadata();
                String metaMap = metadata.get("version");
 
                //用户的version知道了，服务meta也知道了
                if (version.trim().equals(metaMap)) {
                    return server;
                }
            }
 
        }
        return null;
    }
}

<dependency>
    <groupId>io.jmnarloch</groupId>
    <artifactId>ribbon-discovery-filter-spring-cloud-starter</artifactId>
    <version>2.1.0</version>
</dependency>