初始化安装后 Nacos 动态路由配置不生效

时间:2021-04-15 00:38:13

1、每次初始化安装整套项目,包括安装 Nacos 和其他服务还有mysql,redis等其他中间件,安装后 Nacos 获取不到 nacos 路由信息(包括后续新写入动态路由配置)!只有手动重启 Nacos 服务后,才会生效,后续更新的动态路由配置也会正常;

二、版本

Nacos: 2.1.0

spring-boot:2.6.14

spring-cloud:2021.0.1

spring-cloud-alibaba:2021.0.1.0

三、动态路由实现代码(只是其中一种方式,也可用其他)

1、需要引入的pom依赖

		<!--gateway-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>

        <!--SpringCloud ailibaba nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <!-- SpringCloud Ailibaba Nacos Config -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>

2、动态刷新路由service

package com.cherf.flow.gateway.nacosconfig;

import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.concurrent.Executor;
import javax.annotation.PostConstruct;

import com.alibaba.nacos.api.PropertyKeyConst;
import com.cherf.flow.gateway.config.RoutesConfig;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.gateway.event.RefreshRoutesEvent;
import org.springframework.cloud.gateway.route.RouteDefinition;
import org.springframework.cloud.gateway.route.RouteDefinitionWriter;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;
import org.springframework.stereotype.Component;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.nacos.api.NacosFactory;
import com.alibaba.nacos.api.config.ConfigService;
import com.alibaba.nacos.api.config.listener.Listener;
import com.alibaba.nacos.api.exception.NacosException;
import reactor.core.publisher.Mono;

@Component
public class NacosDynamicRouteService implements ApplicationEventPublisherAware {

    private static final Logger log = LoggerFactory.getLogger(NacosDynamicRouteService.class);


    public static final long DEFAULT_TIMEOUT = 30000;

    @Value("${spring.cloud.nacos.discovery.server-addr}")
    private String serverAddr;

    /**
     * 配置 ID
     */
    @Value("${flowGateway.dataId}")
    private String dataId;

    /**
     * 配置 分组
     */
    @Value("${flowGateway.group}")
    private String group;

    /**
     * 静态路由地址
     */
    @Autowired
    private RoutesConfig routesConfig;

    @Autowired
    private RouteDefinitionWriter routeDefinitionWriter;

    private ApplicationEventPublisher applicationEventPublisher;

    private static final List<String> ROUTE_LIST = new ArrayList<>();

    // 增加网关启动时,更新一次配置
    @PostConstruct
    public void init() {
        log.info("gateway route init...");
        try {
            List<RouteDefinition> definitionList = new ArrayList<>();
            definitionList.addAll(routesConfig.getRoutes());
            Properties properties = new Properties();
            // nacos服务器地址,127.0.0.1:8848
            properties.put(PropertyKeyConst.SERVER_ADDR, serverAddr);
            ConfigService configService = NacosFactory.createConfigService(properties);
            if (configService != null) {
                String configInfo = configService.getConfig(dataId, group, DEFAULT_TIMEOUT);
                if (StringUtils.isNotBlank(configInfo)) {
                    definitionList.addAll(JSON.parseArray(configInfo, RouteDefinition.class));
                }
            }
            log.info("update route : {}", definitionList);
            for (RouteDefinition definition : definitionList) {
                addRoute(definition);
            }
        } catch (Exception e) {
            log.error("初始化网关路由时发生错误", e);
        }
    }

    @PostConstruct
    public void dynamicRouteByNacosListener() {
        try {
            Properties properties = new Properties();
            // nacos服务器地址,127.0.0.1:8848
            properties.put(PropertyKeyConst.SERVER_ADDR, serverAddr);
            ConfigService configService = NacosFactory.createConfigService(properties);
            if (configService != null) {
                configService.getConfig(dataId, group, 5000);
                configService.addListener(dataId, group, new Listener() {
                    @Override
                    public void receiveConfigInfo(String configInfo) {
                        if (StringUtils.isNotBlank(configInfo)) {
                            // 手动新配置以后,先清除原来的配置
                            clearRoute();
                            try {
                                List<RouteDefinition> gatewayRouteDefinitions = JSONObject.parseArray(configInfo, RouteDefinition.class);
                                gatewayRouteDefinitions.addAll(routesConfig.getRoutes());
                                for (RouteDefinition routeDefinition : gatewayRouteDefinitions) {
                                    addRoute(routeDefinition);
                                }
                                publish();
                            } catch (Exception e) {
                                log.error("加载网关路由时发生错误", e);
                            }
                        }
                    }

                    @Override
                    public Executor getExecutor() {
                        return null;
                    }
                });
            }
        } catch (NacosException e) {
            log.error("加载网关路由时发生错误", e);
        }
    }


    private void clearRoute() {
        for (String id : ROUTE_LIST) {
            this.routeDefinitionWriter.delete(Mono.just(id)).subscribe();
        }
        ROUTE_LIST.clear();
    }

    private void addRoute(RouteDefinition definition) {
        try {
            routeDefinitionWriter.save(Mono.just(definition)).subscribe();
            ROUTE_LIST.add(definition.getId());
        } catch (Exception e) {
            log.error("初始化网关路由时发生错误", e);
        }
    }

    private void publish() {
        this.applicationEventPublisher.publishEvent(new RefreshRoutesEvent(this.routeDefinitionWriter));
    }

    @Override
    public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
        this.applicationEventPublisher = applicationEventPublisher;
    }
}

3、配置文件中的路由信息配置

package com.cherf.flow.gateway.config;


import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.cloud.gateway.route.RouteDefinition;
import org.springframework.stereotype.Component;
import java.util.List;

/**
 * @author
 */
@ConfigurationProperties(prefix = "spring.cloud.gateway")
@Data
@Component
public class RoutesConfig {

    /**
     * 所有的路由信息
     */
    private List<RouteDefinition> routes;
}

4、yml配置信息

spring:
  cloud:
    nacos:
      discovery:
        # 不使用nacos的配置
        # enabled: false
        server-addr: NACOS_HOST
      config:
        # 配置中心地址
        server-addr: NACOS_HOST
        # 配置文件格式
        file-extension: yml
        username:
        password:
    gateway:
      discovery:
        locator:
          enabled: true #开启从注册中心动态创建路由的功能,利用微服务名进行路由
      routes:
        - id: i-console-api #payment_route    #路由的ID,没有固定规则但要求唯一,建议配合服务名
          uri: lb://i-console-api #匹配后提供服务的路由地址,lb为负载均衡的其中一种模式
          predicates:
            # 断言,路径相匹配的进行路由
            - Path= /api/**,/oapi/**
          filters: #redis令牌桶限流功能
            - name: RequestRateLimiter
              args:
                # 令牌桶每秒填充平均速率
                redis-rate-limiter.replenishRate: 100
                # 令牌桶的总容量
                redis-rate-limiter.burstCapacity: 100

        - id: i-system-api #payment_route    #路由的ID,没有固定规则但要求唯一,建议配合服务名
          uri: lb://i-system-api #匹配后提供服务的路由地址,lb为负载均衡的其中一种模式
          predicates:
            # 断言,路径相匹配的进行路由
            - Path= /sys/**,/user/**
          filters: #redis令牌桶限流功能
            - name: RequestRateLimiter
              args:
                # 令牌桶每秒填充平均速率
                redis-rate-limiter.replenishRate: 100
                # 令牌桶的总容量
                redis-rate-limiter.burstCapacity: 100


flowGateway:
  dataId: gateway-flow
  group: DEFAULT_GROUP

5、Nacos页面

新增配置
初始化安装后 Nacos 动态路由配置不生效
路由信息
初始化安装后 Nacos 动态路由配置不生效

6、启动类修改

** 在启动类中需要添加注解@EeableDiscoveryClient**

package com.cherf;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication(exclude = {SecurityAutoConfiguration.class})
@EnableDiscoveryClient
public class FlowGatewayApplication {
    public static void main(String[] args) {
        SpringApplication.run(FlowGatewayApplication.class, args);
    }
}

PS:参考大佬实现代码,实现代码网上很多可自行百度!

四、可能的原因

配置文件不生效的把名字改为bootstrap.yml
仔细看 Data Id 和 Group 配置;
yml 中配置是否开启了;
初始化安装后 Nacos 动态路由配置不生效
还有很多可能的原因可以看官方issue去解决
这些都不符合我的情况!

五、定位与解决

后续发现是安装后只有第一次自动更新配置有问题,重启Nacos后消失,不是一直有问题,所以就从nacos刷新配置的代码下手,最终定位问题出在时区上
使用 show VARIABLES like '%time_zone%'; 查看数据库时区;
初始化安装后 Nacos 动态路由配置不生效

原因

/nacos/conf/ 目录下 application.properties 中数据源 url 的时区为 UTC 和数据库不一致导致
初始化安装后 Nacos 动态路由配置不生效

解决

将 nacos 配置文件中的 serverTimezone=UTC 改成 serverTimezone=Asia/Shanghai 后解决!

解决了我的问题,但是也可能不适用于其他场景!欢迎大家讨论!