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| <meta itemprop="headline" content="使用服务契约"> |
| <meta itemprop="description" content="使用服务契约"> |
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| <header> |
| <h1 class="page__title" itemprop="headline">使用服务契约 |
| </h1> |
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| </header> |
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| <section class="page__content" itemprop="text"> |
| <aside class="sidebar__right"> |
| <nav class="toc"> |
| <!-- <header><h4 class="nav__title"><i class="fa fa-file-text"></i> 在本页上</h4></header> --> |
| <ul class="toc__menu" id="markdown-toc"> |
| <li><a href="#场景描述" id="markdown-toc-场景描述">场景描述</a></li> |
| <li><a href="#配置说明" id="markdown-toc-配置说明">配置说明</a> <ul> |
| <li><a href="#配置依赖服务" id="markdown-toc-配置依赖服务">配置依赖服务</a></li> |
| <li><a href="#手工配置服务契约" id="markdown-toc-手工配置服务契约">手工配置服务契约</a></li> |
| <li><a href="#从服务中心自动下载契约" id="markdown-toc-从服务中心自动下载契约">从服务中心自动下载契约</a></li> |
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| <h2 id="场景描述">场景描述</h2> |
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| <p>当服务消费者调用服务提供者的服务时，需要注册服务契约。消费者有两种方式获取提供者的服务契约，一种是从服务的提供方离线获取契约文件，手工配置到项目中；另一种是从服务中心自动下载契约。</p> |
| |
| <h2 id="配置说明">配置说明</h2> |
| |
| <blockquote> |
| <p>说明：服务契约的获取方式与服务消费者的开发方式是无关的，用户可以任意组合使用。</p> |
| </blockquote> |
| |
| <h3 id="配置依赖服务">配置依赖服务</h3> |
| |
| <p>服务消费者需要在microservice.yaml文件中配置依赖的provider，示例配置如下：</p> |
| |
| <div class="language-yaml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="na">servicecomb</span><span class="pi">:</span> |
| <span class="c1"># other configurations omitted</span> |
| <span class="na">references</span><span class="pi">:</span> |
| <span class="na">springmvc</span><span class="pi">:</span> |
| <span class="na">version-rule</span><span class="pi">:</span> <span class="s">0.0.1</span> |
| </code></pre></div></div> |
| |
| <blockquote> |
| <p>version-rule是版本匹配规则，有四种格式：</p> |
| |
| <ul> |
| <li>精确版本匹配：例如<code class="language-plaintext highlighter-rouge">version-rule: 0.0.1</code>，表示只匹配版本号为0.0.1的服务提供者</li> |
| <li>后续版本匹配：例如<code class="language-plaintext highlighter-rouge">version-rule: 1.0.0+</code>，表示匹配版本号大于或等于1.0.0的服务提供者</li> |
| <li>最新版本：<code class="language-plaintext highlighter-rouge">version-rule: latest</code>，表示匹配最新版本的服务提供者</li> |
| <li>版本范围：例如<code class="language-plaintext highlighter-rouge">1.0.0-2.0.2</code>，表示匹配版本号在1.0.0至2.0.2之间的服务提供者，包含1.0.0和2.0.2</li> |
| </ul> |
| |
| <p>此配置项默认为<code class="language-plaintext highlighter-rouge">latest</code></p> |
| </blockquote> |
| |
| <h3 id="手工配置服务契约">手工配置服务契约</h3> |
| |
| <p>服务消费者的开发者在线下拿到服务提供者的契约，配置到消费者工程的特定目录下。服务契约在项目中的存放目录与<a href="/cn/users/service-contract/">服务契约</a>的配置说明部分相同。</p> |
| |
| <p>microservice目录下的每一个目录代表一个微服务，微服务目录下的每一个yaml文件代表一个schema契约，文件名就是schemaId。applications目录下存放需要指明appId的服务契约，用于跨app调用等场景。目录结构如下所示：</p> |
| <pre><code class="language-txt">resources |
| - microservices |
| - serviceName # 微服务名 |
| - schemaId.yaml # schema接口的契约 |
| - applications |
| - appId # 应用ID |
| - serviceName # 微服务名 |
| - schemaId.yaml # schema接口的契约 |
| </code></pre> |
| |
| <h3 id="从服务中心自动下载契约">从服务中心自动下载契约</h3> |
| |
| <p>服务消费者也可以不用显式地将契约存放在项目目录中，当程序启动时，ServiceComb框架会自动根据microservice.yaml文件中配置的服务提供者的微服务名称和版本号，从服务中心自动下载契约信息。</p> |
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