Mock浅析和简单实践

以你之姓@ 2023-06-12 06:16 84阅读 0赞

## 一、背景 ##

某个服务或前端依赖一个服务接口，该接口可能依赖多个低层服务或模块，或第三方接口，这种情况下需要搭建多个底层模块多套测试环境，比较痛苦，如果mock掉第一级的服务接口，可以节约不少人力，同时规避了可能由第三方服务导致的问题。

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目前常见服务或接口协议主要两种，一种是RPC，另一种是HTTP/HTTPS，mock原理都类似，要么是修改原服务地址为Mock服务地址，要么是拦截原服务的请求Mock返回值，总之就是构造一个假的服务，替代原有服务。

## 二、Mock实现方式 ##

只介绍下HTTP/HTTPS协议的mock实现，RPC不做深究，原理都类似。Mock实现常见两种方式，一种是通过代理抓取待测服务请求并控制返回值；另一种是直接将待测服务指向Mock服务地址，替代下游原始真实服务。

第一种通过替换待测服务为Mock Gateway地址抓取请求并控制返回值来实现，（或者简单点，直接用Mock Service地址来替换待测服务地址也可以，更简单）通过Gateway网关转发请求，下游再设具体mock服务，可以是一个mock服务直接返回预期的mock值，也可以是proxy服务继续代理请求到其他地址，或redirect服务转发到某个特殊的地址等等方式。

如果自己搭建，建议使用java技术栈，Mock Gateway和Mock Service可以使用springcloud或springboot来实现，比较简单，mock策略和数据可以使用mysql或redis或es来存储，或者放到内存中也是可以的。

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第二种直接使用正向代理代理请求，拦截请求，常用工具有charles、fiddler，mitmproxy等，工具比较成熟，直接使用即可，不做深入讨论，如果持久化Mock数据，建议使用mitmproxy，技术栈是python，可自行研究

## 三、Mock实践实例 ##

介绍下第一种mock方案实践方案，技术栈选用springcloud+zuul+mybatis+mysql+keytools

*  工程1：mock-gateway用于实现拦截请求，接受到请求后，充当路由功能
 *  工程2：mock-service用于接受mock-gateway转发来的请求，指定mock规则和mock数据返回
 *  工程3：proxy-service用于接受mock-gateway转发来的请求，继续透传请求或其他mock规则改变请求

*  创建数据库和表
    
     *      #存储mock规则，包含所有mock、proxy、redirect等规则数据
            -- auto-generated definition
            create table mock_app
            (
              id               int auto_increment,
              name             varchar(200) null,
              description      varchar(200) null,
              request_type     varchar(20)  null,
              request_uri      varchar(200) null,
              request_query    longtext     null,
              request_body     longtext     null,
              request_header   longtext     null,
              mock_data        longtext     null,
              redirect_type    varchar(200) null,
              redirect_url     varchar(200) null,
              redirect_query   longtext     null,
              redirect_body    longtext     null,
              redirect_header  longtext     null,
              proxy_url_perfix varchar(200) null,
              is_active        tinyint(1)   null,
              create_time      timestamp    not null,
              update_time      timestamp    not null,
              approver         varchar(200) not null,
              constraint mock_app_id_uindex
              unique (id)
            );
            
            alter table mock_app
              add primary key (id);
        
            #存储mock策略，mock_app表中同一条mock数据根据mock策略返回不同的值
            -- auto-generated definition
            create table mock_strategy
            (
              id                     int auto_increment,
              name                   varchar(200) not null,
              description            varchar(200) not null,
              mock_response_strategy int          not null,
              create_time            timestamp    not null,
              update_time            timestamp    not null,
              approver               varchar(200) not null,
              constraint mock_strategy_id_uindex
              unique (id)
            );
            
            alter table mock_strategy
              add primary key (id);
        
         
 *  mock-gateway
    
     *  直接创建一个springcloud工程，不会的自己搜索下，很简单，官网直接可以生产工程目录
     *  添加springcloud主类
        
            package com.personal.mock;
            
            import org.mybatis.spring.annotation.MapperScan;
            import org.springframework.boot.SpringApplication;
            import org.springframework.boot.autoconfigure.SpringBootApplication;
            import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
            
            
            @SpringBootApplication
            @MapperScan(basePackages = "com.personal.mock.dao")
            @EnableZuulProxy
            public class MockApplication {
            
            	public static void main(String[] args) {
            		SpringApplication.run(MockApplication.class, args);
            	}
            }
        
            #properties配置文件
            
            #gateway服务端口
            server.port=10086
            #添加zuul拦截条件
            zuul.routes.root.path=/*
            zuul.routes.root.url=http://127.0.0.1:10086/
            
            #数据库相关配置
            spring.datasource.url = jdbc:mysql://localhost:3306/mock?characterSet=utf8mb4&useSSL=false
            spring.datasource.username = root
            spring.datasource.password = QWER1234qwer
            
            spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
            spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
            spring.datasource.filters=stat
            spring.datasource.maxActive=20
            spring.datasource.initialSize=1
            spring.datasource.maxWait=60000
            spring.datasource.minIdle=1
            spring.datasource.timeBetweenEvictionRunsMillis=60000
            spring.datasource.minEvictableIdleTimeMillis=300000
            spring.datasource.validationQuery=select 'x'
            spring.datasource.testWhileIdle=true
            spring.datasource.testOnBorrow=true
            spring.datasource.testOnReturn=true
            spring.datasource.poolPreparedStatements=true
            spring.datasource.maxOpenPreparedStatements=20
            
            #下游服务配置
            mock.request.address=http://127.0.0.1:10010/mock/request
            mock.response.address=http://127.0.0.1:10010/mock/response
            proxy.address=http://127.0.0.1:10011/proxy
            redirect.address=http://127.0.0.1:10012/redirect
        
         
     *  添加过滤器，过滤请求，过滤规则也在这里实现即可
        
            package com.personal.mock.filter;
            
            import com.alibaba.fastjson.JSONObject;
            import com.netflix.zuul.ZuulFilter;
            import com.netflix.zuul.context.RequestContext;
            import com.personal.mock.common.MockStrategyEnum;
            import com.personal.mock.po.MockApp;
            import com.personal.mock.route.MockZuulRoute;
            import com.personal.mock.route.MockZuulRouteLocator;
            import com.personal.mock.service.FilterService;
            import com.personal.mock.service.RequestService;
            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.stereotype.Component;
            
            import javax.servlet.http.HttpServletRequest;
            import java.util.Iterator;
            import java.util.Map;
            
            import static com.personal.mock.common.Constant.*;
            import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_TYPE;
            
            /**
             * author: zhaoxu
             * date: 2019/4/30 上午10:07
             */
            @Component
            public class MockPreFilter extends ZuulFilter {
            
                private static Logger logger = LoggerFactory.getLogger(MockPreFilter.class);
            
                @Value(value = "${mock.request.address}")
                private String mockRequestAddress;
                @Value(value = "${mock.response.address}")
                private String mockResponseAddress;
                @Value(value = "${proxy.address}")
                private String proxyAddress;
                @Value(value = "${redirect.address}")
                private String redirectAddress;
            
            
                @Autowired
                FilterService filterService;
            
                @Autowired
                RequestService requestService;
            
                @Autowired
                MockZuulRouteLocator mockZuulRouteLocator;
            
                @Override
                public String filterType() {
                    return PRE_TYPE;
                }
            
                @Override
                public int filterOrder() {
                    return 4;
                }
            
                @Override
                public boolean shouldFilter() {
                    return true;
                }
            
                @Override
                public Object run() {
                    RequestContext ctx = RequestContext.getCurrentContext();
                    HttpServletRequest httpServletRequest = ctx.getRequest();
            
                    logger.info(String.valueOf(requestService.getRequestHeader()));
                    logger.info(requestService.getMethod());
                    logger.info(requestService.getQueryString());
                    logger.info(requestService.getRequestURI());
                    logger.info(String.valueOf(requestService.getRequestBody()));
            
                    logger.info("request uri: "+httpServletRequest.getRequestURI());
                    Map<MockApp, Integer> map = filterService.getFilterInfo(httpServletRequest);
                    if (null != map){
                        Iterator <MockApp>iterator = map.keySet().iterator();
                        MockApp mockApp = iterator.next();
                        Integer mockStrategyId = map.get(mockApp);
                        String path = mockApp.getRequestUri();
                        Integer mockAppId = mockApp.getId();
                        String url = null;
                        try{
                            MockStrategyEnum mockStrategyEnum = MockStrategyEnum.getMockStrategyByStrategyId(mockStrategyId);
                            switch (mockStrategyEnum) {
                                case MOCK_RESPONSE_DIRECT:
                                    url = mockResponseAddress;
                                    logger.info("【正常，gateway转发给下级服务处理】" +url);
                                    break;
                                case MOCK_REQUEST_RETURN:
                                    url = mockRequestAddress;
                                    logger.info("【正常，gateway转发给下级服务处理】" +url);
                                    break;
                                case REQUEST_REDIRECT:
                                    url = redirectAddress;
                                    logger.info("【正常，gateway转发给下级服务处理】" +url);
                                    break;
                                case PROXY:
                                    url = proxyAddress;
                                    logger.info("【正常，gateway转发给下级服务处理】" +url);
                                    break;
                            }
                        } catch(NullPointerException e){
                            logger.error("【异常，没有匹配到策略，详情如下：】");
                            logger.error("【mock_app.id=%d 对应的mock_strategy.mock_response_strategy配置异常，请检查】");
                        }
                        MockZuulRoute mockZuulRoute = new MockZuulRoute(mockAppId.toString(),path,url);
                        mockZuulRouteLocator.updateRoutes(mockZuulRoute);
                        ctx.addZuulRequestHeader(MOCK_STRATEGY_ID,mockStrategyId.toString());
                        ctx.addZuulRequestHeader(MOCK_APP_ID,mockAppId.toString());
                        ctx.addZuulRequestHeader(REQUEST_URI,httpServletRequest.getRequestURI());
                    } else {
                        logger.error("【异常，没有匹配到mock数据，请检查】");
                        ctx.setSendZuulResponse(false);
                        ctx.setResponseStatusCode(401);
                        JSONObject jsonObject = new JSONObject();
                        jsonObject.put("errorMessage","【呃呃呃, 你的请求没有匹配到数据库的mock数据，请检查】");
                        ctx.setResponseBody(jsonObject.toJSONString());
                        ctx.getResponse().setContentType("application/json;charset=UTF-8");
                    }
                    return null;
                }
            }
        
         
     *  mock-service、mock-proxy服务与mock-gateway代码结构类似，去掉请求过滤器即可

po层和dao层的代码就不粘贴了，类似与mybatis，后续我会把代码放到github上

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