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<div class="md-content" data-md-component="content">
<article class="md-content__inner md-typeset">
<h1>本地开发和测试</h1>
<h2 id="_1">概念阐述</h2>
<p>本小节介绍如何在开发者本地进行消费者/提供者应用的开发调试。开发服务提供者请参考3 开发服务提供者章节,开发服务消费者请参考4 开发服务消费者。服务提供者和消费提供者均需要连接到在远程的服务中心,为了本地微服务的开发和调试,本小节介绍了两种搭建本地服务中心的方法进行本地微服务调试:</p>
<ul>
<li>
<p>启动本地服务中心</p>
</li>
<li>
<p>通过local file模拟启动服务中心Mock机制</p>
</li>
<li>
<p>通过设置环境信息方便本地调试</p>
</li>
</ul>
<p>服务中心是微服务框架中的重要组件,用于服务元数据以及服务实例元数据的管理和处理注册、发现。服务中心与微服务提供/消费者的逻辑关系下图所示:<br />
<img alt="" src="../start/develop-test.png" /></p>
<h2 id="_2">启动本地服务中心</h2>
<ul>
<li>
<p><strong>步骤 1 </strong>启动本地服务中心</p>
</li>
<li>
<p>以可执行文件的方式运行</p>
</li>
</ul>
<ul class="nav nav-tabs">
<li data-toggle="tab" class="active"><a data-toggle="tab" href="#windows">Windows</a></li>
<li data-toggle="tab"><a data-toggle="tab" href="#linux">Linux</a></li>
</ul>
<div class="tab-content">
<div id="windows" class="tab-pane active" markdown="1">
1. 下载[服务注册中心可执行文件压缩包](http://apache.org/dyn/closer.cgi/incubator/servicecomb/incubator-servicecomb-service-center/1.0.0-m1/apache-servicecomb-incubating-service-center-1.0.0-m1-windows-amd64.tar.gz)
2. 解压缩到当前文件夹
3. 进入解压缩后的目录,然后双击运行**start-service-center.bat**文件
</div>
<div id="linux" class="tab-pane fade" markdown="1">
1. 下载服务注册中心可执行文件压缩包并解压缩
```bash
wget http://apache.org/dyn/closer.cgi/incubator/servicecomb/incubator-servicecomb-service-center/1.0.0-m1/apache-servicecomb-incubating-service-center-1.0.0-m1-linux-amd64.tar.gz
tar xvf apache-servicecomb-incubating-service-center-1.0.0-m1-linux-amd64.tar.gz
```
2. 运行服务注册中心
```bash
bash apache-servicecomb-incubating-service-center-1.0.0-m1-linux-amd64/start-service-center.sh
```
注意:前端(frontend)在Linux环境下默认会绑定ipv6地址,导致浏览器报错,修复办法为:先修改conf/app.conf中的httpaddr为外部可达网卡ip,之后修改app/appList/apiList.js中`ip : 'http://127.0.0.1'`为对应ip,最后重启ServiceCenter即可。
</div>
</div>
<p>注意:Window和Linux版本均只支持64位系统。</p>
<ol>
<li>以Docker的方式运行</li>
</ol>
<p><code>bash
docker pull servicecomb/service-center
docker run -d -p 30100:30100 servicecomb/service-center:latest</code></p>
<ul>
<li><strong>步骤 2 </strong>启动本地服务中心后,在服务提供/消费者的microservice.yaml文件中配置ServerCenter的地址和端口,示例代码:</li>
</ul>
<p><code>yaml
servicecomb:
service:
registry:
address:
# 服务中心地址及端口
http://127.0.0.1:30100</code></p>
<ul>
<li><strong>步骤 3 </strong>开发服务提供/消费者,启动微服务进行本地测试。</li>
</ul>
<p><strong>----结束</strong></p>
<h2 id="mock">Mock机制启动服务中心</h2>
<p>在本进程内存中模拟一个只能本进程使用的服务中心,一般是在测试场景中使用。
* ### 进程内调用
只需要在启动ServiceComb引擎之前声明一下即可启用:</p>
<pre><code class="language-java">System.setProperty(&quot;local.registry.file&quot;, &quot;notExistJustForceLocal&quot;);
</code></pre>
<ul>
<li>
<h3 id="_3">跨进程调用</h3>
<p>如果部署比较简单,并且部署信息是静态的,即使有跨进程调用也可以使用本Mock机制
producer端仍然像“进程内调用”一样声明即可
但是,因为Mock并不能跨进程生效,所以consumer端的Mock,需要提供一个本地的配置文件,在里面描述调用目标的详细信息,包括名字、版本、地址、schema id等等信息
同样,因为Mock不能跨进程,consumer也无法动态取得producer的契约信息,所以,需要在本地提供契约文件
(这个场景,使用Mock服务中心,比使用standalone的服务中心,成本高得多得多,不建议使用)</p>
</li>
<li>
<p><strong>步骤 1 </strong>新建本地服务中心定义文件,假设名字为registry.yaml,内容示例如下:</p>
</li>
</ul>
<p><code>yaml
localserv:
- id: "100"
version: "0.0.1"
appid: localservreg
schemaIds:
- hello
instances:
- endpoints:
- rest://localhost:8080
- highway://localhost:7070</code>
* <strong>步骤 2 </strong>consumer本地部署契约文件</p>
<p>参考:<a href="https://huaweicse.github.io/servicecomb-java-chassis-doc/zh_CN/build-provider/define-contract.html">定义服务契约</a>
* <strong>步骤 3 </strong>在consumer main函数,启动ServiceComb引擎之前声明:</p>
<pre><code class="language-java">  System.setProperty(&quot;local.registry.file&quot;, &quot;/path/registry.yaml&quot;);
</code></pre>
<p>setProperty第二个参数填写registry.yaml在磁盘中的系统绝对路径,注意区分在不同系统下使用对应的路径分隔符。</p>
<h2 id="_4">通过设置环境信息方便本地调试</h2>
<p>java chassis在设计时,严格依赖于契约,所以正常来说契约变了就必须要修改微服务的版本。但是如果当前还是开发模式,那么修改接口是很正常的情况,每次都需要改版本的话,对用户来说非常的不友好,所以增加了一个环境设置。如果微服务配置成开发环境,接口修改了(schema发生了变化),重启就可以注册到服务中心,而不用修改版本号。但是如果有consumer已经调用了重启之前的服务,那么consumer端需要重启才能获取最新的schema。比如A -&gt; B,B接口进行了修改并且重启,那么A这个时候还是使用B老的schema,调用可能会出错,以免出现未知异常,A也需要重启。有三种方式可以设置,推荐使用方法1
* 方法1:通过JVM启动参数<strong>-Dservice_description.environment=development</strong>进行设置</p>
<ul>
<li>方法2:通过microservice.yaml配置文件来指定</li>
</ul>
<p><code>yaml
service_description:
environment: development</code></p>
<ul>
<li>方法3:通过环境变量来指定(仅限于Windows系统),比如在Eclipse下面进行如下设置
<img alt="" src="../assets/env.PNG" /></li>
</ul>
</article>
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