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                        <h1 class="page-title"><a href="/show-204449802.html" title="PNP : Remote Procedure Call (RPC)">PNP : Remote Procedure Call (RPC)</a></h1>
            
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<h3>RPC</h3>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpnMk9DOWtZVFF5WVRneE4yWXhOV1EzWldJMlpUSmpOelZqTjJZNE9EVXlORGd6TkM1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>RPC是构建分布式系统的基础。</p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpZd055ODROVFJpWVRCa1pEZGpaamMwT0RKallXUXlOREkwTVROaE1EY3hZMlkzWmk1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"><br>
RPC不会限制所使用的语言，跨语言。</p>
<blockquote>
<p>brpc : <a href="https://github.com/brpc/brpc" rel="nofollow" target="_blank">https://github.com/brpc/brpc</a></p>
</blockquote>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpZME9DOW1aVFJtWkRnek5XSTJZemRqTURSbE1UWm1aRGRpTXpJMVltWmlOalF3TUM1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>protobuf提供了message passing的能力，可以在此基础之上实现一个RPC框架。</p>
<p>type表示消息类型，是请求还是响应 <br>
id用来标识一个请求</p>
<p>service是一个string， 表示客户端想要调用哪个class <br>
method，表示客户端想要调用该class的哪个方法 <br>
request 表示请求，即method的参数 <br>
response表示响应，即method的返回值</p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpJMk1TODRPV1ZtWXpJd1lqVmxaRGhsTlRCaE1XVXpZVE5qWTJJd01qZ3dPRGc1TlM1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>服务器收到请求后，根据message的service名字找到具体的处理类的具体method，然后将request传递给该method，并且将response返回。</p>
<p>这样就避免了手动处理类型，调用处理函数的麻烦。下面是实现的伪代码：</p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpFNU1pOWhOVEZqWm1SaU5HRTVOVFEzWW1VNU4yTXlabVZrTVdRMU1XVTBabUpqT0M1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>根据service的名字找到对应的类 <br>
然后使用该类的GetDescriptor方法得到该类的 Descriptor， 通过这个Descriptor可以知道该类支持哪些方法method（自省） <br>
然后找到method的Descriptor <br>
将message反序列化 <br>
根据method的descriptor，创建一个返回类型消息 <br>
最后使用该service的CallMethod执行method</p>
<p>可以看到通过Descriptor，可以通过方法的名字找到对应的方法。确实很方便，不必根据消息类型收到将请求分发到各个处理函数了。</p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpNNU9TOHlZemN5WXpVNVltSTNOR0V3TUdFd09XUTNPR0l3TmpNNVlUSTJPV0ppTnk1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>其中CallMethod为虚函数，Service为SudokuService，所以调用了SudokuService::CallMethod , CallMethod是对方法的分发，它根据method的Descriptor，得到method的index，从而调用响应的函数，这里是： SudokuService::Solve, Solve也是一个虚函数，具体调用 SudokuServiceImpl::Solve()</p>
<h3>实现分析</h3>
<p>主要思想是利用protobuf，实现一些接口（虚函数）。因此要弄清楚服务器需要实现什么接口，客户端需要实现什么接口。</p>
<p>先看服务器端</p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpRek1TOWpPREkxTmprek1XTmlNMlkxWm1aaE5Ua3dZVGM1TjJKaU9HSmhOR0k1Tnk1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>protobuf会自动生成SudokuService类，它继承了Service类，该类定义了两个virtual function： GetDescriptor 和 CallMethod</p>
<p>其中函数Solve就是proto文件描述的服务。</p>
<p>SudokuService会有两个派生类</p>
<ul>
<li>SudokuService_Stub ：客户端</li>
<li>SudokuServiceImpl : 服务器端</li>
</ul>
<p>其中Solve函数是需要我们自己具体实现的，那么Solve是在哪里被调用的呢？答案是CallMethod</p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpFM05DOW1NRE0yWVRZek5tRTRNekV5WkRBeE5UQTRNRGc0T1RGa1pEUmhaR0prTmk1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>这些都是自动生成的，其中down_cast是进行向下转型,因为参数request是一个基类的指针，需要转换为具体的类型。down_cast在Debug模式使用dynamic_cast ，否则使用static_cast. 这样可以避免dynamic_cast的开销。</p>
<p>实现服务端的代码： <br><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpnd01pODNaakEzTmpFeU1qZzNNR0poWmpOak1UVTFNR0l5TWpZek0ySmpPV0V4WVM1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>继承SudokuService，然后override 虚函数Solve即可。</p>
<p>那么怎么应用到muduo中的呢？</p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpFNU1pOWhOVEZqWm1SaU5HRTVOVFEzWW1VNU4yTXlabVZrTVdRMU1XVTBabUpqT0M1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"><br>
其中services是service名字到服务的实现映射map, 收到一个完整的RpcMessage时，根据service的名字找到对应的service实现。然后使用GetDescriptor、FindMethodByName得到调用的方法。然后反序列化消息，new一个response，接着调用CallMethod，注意传入的参数done是一个lambda，该函数就是Solve的最后一个参数，上面提到的服务器实现的Solve函数最后会调用done，即这里的lambda是在服务器准备好response后调用用来生成响应，并发送回客户端的。此外注意，需要delete request和response。</p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpNNU9TOHlZemN5WXpVNVltSTNOR0V3TUdFd09XUTNPR0l3TmpNNVlUSTJPV0ppTnk1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>那么客户端怎么实现的呢？</p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpVd05DOWhNakZtTW1WbU9ERmpOREZrTW1WbU56QmhObUZsWVRCbU5XSXpORFUzT0M1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>客户端使用的类SudokuService_Stub是自动生成的，其中Solve调用的是RpcChannel的CallMethod，此函数是一个纯虚函数，需要自己实现RpcChannel类时实现该虚函数。</p>
<p>客户端代码框架 <br><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpjeU9TODNZalprT0RjeFpEUTJNRFk0T1RVd05ERmlPV016WmpKbE5XRmpPREUwT1M1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>这里的stub就是SudokuService_Stub。 <br>
构造一个RpcChannel，然后对TcpConnection设置回调函数为RpcChannel::onMessage，这样RpcChannel就可以拿到消息了。Channel也保存一个TcpConnection的指针，这样就可以用来发送数据了。然后以此Channel创建一个Stub</p>
<p>接着就是构造请求，调用stub的Solve，并传入一个labmda，在收到响应时调用。</p>
<p>所以这里关键是如何实现RpcChannel： <br><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpFd0x6aGpZelV3WVRZeE9UYzNOV05qTlRoaVkyRmlORGxtTXpoaU9HWmtaV1l5TG5CdVp3PT0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>这里是异步的client，需要记住哪些是发出了请求，但是没有收到响应的，即outstandings。</p>
<p>RpcChannel::CallMethod的实现 <br><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THprM01TOWlZbUk1TTJRellUQmtNVFkzWTJVNVlqVmpPRE5sTnpnNE56aGlOemRsTXk1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpjd05TOHhNbVpsWkdJNU1HSXhaak14TldVNE5EUmxNREE1TXpOaE0yRXdNV016TVM1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
<p>客户端call trace</p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpnME9TODRNakF6TnpJelkyVm1OREpoWW1JME5EbGtNR1kzTmpWa05UWm1aREpqTVM1d2JtYz0=" alt="PNP : Remote Procedure Call (RPC)" title="PNP : Remote Procedure Call (RPC)"></p>
 
                    
            
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