研发提速：nacos+openfeign环境下的本地链接服务

项目研发过程中，经常会遇到与测试人员工作重叠的情况，十分影响效率。

做了一个修改，可以在本地环境启动项目后和测试环境交互，并且不影响测试环境，理论上也可以用于线上环境的异常的快速处理。

准备事项如下：

一：搭建本地的nacos服务。

二：导入测试环境相应项目的nacos配置文件。

三：新增代码：

修改LoadBalancerFactory获取服务host的方式，由于是本地启动的项目，并且连接的还是本地的nacos，所以项目启动后，肯定不会注册到测试环境，相对的也获取不到测试环境的其他服务。

由于本人使用的时候是基于CachingSpringLoadBalancerFactory ，如果直接使用时不生效或者异常，可以DEBUG跟踪一下自己框架调用服务时使用的具体LoadBalancerFactory类。

复制代码

  3 import cn.hutool.http.HttpUtil;
  4 import com.alibaba.fastjson.JSON;
  5 import com.alibaba.fastjson.JSONArray;
  6 import com.alibaba.fastjson.JSONObject;
  7 import com.netflix.client.config.IClientConfig;
  8 import com.netflix.loadbalancer.ILoadBalancer;
  9 import com.netflix.loadbalancer.Server;
 10 import org.springframework.cloud.client.loadbalancer.LoadBalancedRetryFactory;
 11 import org.springframework.cloud.netflix.ribbon.ServerIntrospector;
 12 import org.springframework.cloud.netflix.ribbon.SpringClientFactory;
 13 import org.springframework.cloud.openfeign.ribbon.CachingSpringLoadBalancerFactory;
 14 import org.springframework.cloud.openfeign.ribbon.FeignLoadBalancer;
 15 import org.springframework.cloud.openfeign.ribbon.RetryableFeignLoadBalancer;
 16 import org.springframework.util.ConcurrentReferenceHashMap;
 17 import org.springframework.util.ObjectUtils;
 18 
 19 import java.util.ArrayList;
 20 import java.util.List;
 21 import java.util.Map;
 22 
 23 public class DevCachingSpringLoadBalancerFactory extends CachingSpringLoadBalancerFactory {
 24 
 25     private volatile Map<String, FeignLoadBalancer> cache = new ConcurrentReferenceHashMap<>();
 26     private volatile Map<String, List<Server>> server = new ConcurrentReferenceHashMap<>();
 27     private volatile String ip;
 28     private volatile String port;
 29     private volatile String namespaceid;
 30 
 31     public DevCachingSpringLoadBalancerFactory(SpringClientFactory factory) {
 32         super(factory);
 33     }
 34 
 35     public DevCachingSpringLoadBalancerFactory(SpringClientFactory factory, LoadBalancedRetryFactory loadBalancedRetryPolicyFactory) {
 36         super(factory, loadBalancedRetryPolicyFactory);
 37     }
 38 
 39     public boolean initialize(String ip,String port,String namespaceid) {
 40         this.ip = ip;
 41         this.port = port;
 42         this.namespaceid = namespaceid;
 43         return null != ip ? null != port ?  null != namespaceid ? true : false :false :false;
 44     }
 45 
 46     @Override
 47     public FeignLoadBalancer create(String clientName) {
 48         FeignLoadBalancer client = this.cache.get(clientName);
 49         if (client != null) {
 50             return client;
 51         }
 52         IClientConfig config = this.factory.getClientConfig(clientName);
 53         ILoadBalancer lb = this.factory.getLoadBalancer(clientName);
 54 
 55         //修改部分
 56         List<Server> list = lb.getAllServers();
 57         if (null == list || ObjectUtils.isEmpty(list)) list = new ArrayList<>();
 58         list.addAll(Servers(clientName));
 59         lb.addServers(list);
 60 
 61         ServerIntrospector serverIntrospector = this.factory.getInstance(clientName,
 62                 ServerIntrospector.class);
 63         client = this.loadBalancedRetryFactory != null
 64                 ? new RetryableFeignLoadBalancer(lb, config, serverIntrospector,
 65                 this.loadBalancedRetryFactory)
 66                 : new FeignLoadBalancer(lb, config, serverIntrospector);
 67         this.cache.put(clientName, client);
 68         return client;
 69     }
 70 
 71     /**
 72      * 获取server
 73      * 返回数组，重试机制交由原框架
 74      * http://ip:port/nacos/v1/ns/instance/list?namespaceId=namespaceid&serviceName=client
 75      */
 76     public List<Server> Servers(String client) {
 77         if(server.containsKey(client)) return server.get(client);
 78         else synchronized (server) {
 79             if(server.containsKey(client)) return server.get(client);
 80             else {
 81                 server.put(client,new ArrayList<Server>());
 82                 String url = new StringBuilder("http://")
 83                         .append(ip)
 84                         .append(":")
 85                         .append(port)
 86                         .append("/nacos/v1/ns/instance/list?")
 87                         .append("namespaceId=")
 88                         .append(namespaceid)
 89                         .append("&serviceName=")
 90                         .append(client).toString();
 91                 JSONObject jsonObject = JSON.parseObject(HttpUtil.get(url));
 92                 JSONArray hosts = jsonObject.getJSONArray("hosts");
 93                 for (int i = 0; i < hosts.size(); i++) {
 94                     server.get(client).add(new Server(hosts.getJSONObject(i).getString("ip"),hosts.getJSONObject(i).getInteger("port")));
 95                 }
 96                 return server.get(client);
 97             }
 98         }
 99     }
100 
101 }

这个文件可以不用添加，主要是用来做一些其他的扩展。

复制代码

 3 import feign.Client;
 4 import feign.Request;
 5 import feign.Response;
 6 import org.springframework.cloud.netflix.ribbon.SpringClientFactory;
 7 import org.springframework.cloud.openfeign.ribbon.CachingSpringLoadBalancerFactory;
 8 import org.springframework.cloud.openfeign.ribbon.LoadBalancerFeignClient;
 9 
10 import java.io.IOException;
11 
12 public class DevFeignClient extends LoadBalancerFeignClient{
13 
14     public DevFeignClient(Client delegate, CachingSpringLoadBalancerFactory lbClientFactory, SpringClientFactory clientFactory) {
15         super(delegate, lbClientFactory, clientFactory);
16     }
17 
18     @Override
19     public Response execute(Request request, Request.Options options) throws IOException {
20         return super.execute(request, options);
21     }
22 }

配置文件用来替换原来IOC中的BEAN，另外用于获取后面yml文件中的自定义配置。

复制代码

 3 import feign.Client;
 4 import org.springframework.beans.factory.annotation.Value;
 5 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 6 import org.springframework.cloud.netflix.ribbon.SpringClientFactory;
 7 import org.springframework.cloud.openfeign.ribbon.CachingSpringLoadBalancerFactory;
 8 import org.springframework.context.annotation.Bean;
 9 import org.springframework.context.annotation.Configuration;
10 
11 @Configuration
12 public class DevFeignConfig {
13 
14     @ConditionalOnProperty("feign.dev.enabled")
15     @Configuration(proxyBeanMethods = false)
16     class DefaultFeignLoadBalancedConfiguration {
17         @Value("${feign.dev.ip}")
18         String ip;
19         @Value("${feign.dev.port}")
20         String port;
21         @Value("${feign.dev.namespaceid}")
22         String namespaceid;
23 
24 
25         @Bean
26         public Client feignClient(CachingSpringLoadBalancerFactory cachingFactory, DevCachingSpringLoadBalancerFactory devFactory,
27                                   SpringClientFactory clientFactory) {
28             System.out.println("#####################################进入本地调试模式#####################################");
29             return new DevFeignClient(new Client.Default(null, null),null == devFactory?cachingFactory:devFactory,
30                     clientFactory);
31         }
32 
33         @Bean
34         public DevCachingSpringLoadBalancerFactory devFactory(SpringClientFactory factory) {
35             DevCachingSpringLoadBalancerFactory devFactory = new DevCachingSpringLoadBalancerFactory(factory);
36             if(devFactory.initialize(ip,port,namespaceid)) return devFactory;
37             System.out.println("#####################################本地调试模式异常#####################################");
38             System.out.println("feign.dev.ip " + ip);
39             System.out.println("feign.dev.port " + port);
40             System.out.println("feign.dev.namespaceid " + namespaceid);
41             System.out.println("#####################################本地调试模式异常#####################################");
42             return null;
43         }
44     }
45 
46 
47 }

修改yml文件，主要是用来配置新增的自定义属性和小插件的开启和关闭。

建议手动在本地项目的yml文件添加属性，yml文件的配置，直接复制容易出现问题。

新增属性如下：

复制代码

feign.dev.enabled

复制代码

feign.dev.ip

复制代码

feign.dev.port

复制代码

feign.dev.namespaceid

复制代码

server:
  port: 服务端口号
spring:
  application:
    name: 服务名称
  profiles:
    active: dev
  cloud:
    nacos:
      config:
        file-extension: yml
        namespace: 本地Nacos的命名空间
      username: 本地Nacos的账号
      password: 本地Nacos的密码
      server-addr: 本地Nacos的IP:本地Nacos的端口号
      discovery:
        namespace: 本地Nacos的命名空间
        group: DEFAULT_GROUP
        enabled: true
        register-enabled: true
feign:
  dev:
    #true为开启本地调式，false为关闭
    enabled: false
    ip: 测试环境Nacos的IP
    port: 测试环境Nacos的端口号
    namespaceid:  测试环境Nacos的命名空间
  client:
    config:
      default:
        #不设置connectTimeout会导致readTimeout设置不生效
        connectTimeout: 5000
        readTimeout: 5000