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。
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。
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。
<em id="__mceDel"> 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 }</em>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：
feign.dev.enabledfeign.dev.ipfeign.dev.portfeign.dev.namespaceidserver:
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
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