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<h3 style="margin-top:0px;">Go Quick Start</h3>
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<p class="lead">This guide gets you started with gRPC in Go with a simple
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working example.</p>
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<div id="toc"></div>
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<h3 id="prerequisites">Prerequisites</h3>
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<h4 id="go-version">Go version</h4>
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<p>gRPC requires Go 1.6 or higher.</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">$ go version</code></pre></div>
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<p>For installation instructions, follow this guide: <a href="https://golang.org/doc/install">Getting Started - The Go Programming Language</a></p>
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<h4 id="install-grpc">Install gRPC</h4>
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<p>Use the following command to install gRPC.</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">$ go get -u google.golang.org/grpc</code></pre></div>
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<h4 id="install-protocol-buffers-v3">Install Protocol Buffers v3</h4>
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<p>Install the protoc compiler that is used to generate gRPC service code. The simplest way to do this is to download pre-compiled binaries for your platform(<code>protoc-<version>-<platform>.zip</code>) from here: <a href="https://github.com/google/protobuf/releases">https://github.com/google/protobuf/releases</a></p>
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<ul>
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<li>Unzip this file.</li>
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<li>Update the environment variable <code>PATH</code> to include the path to the protoc binary file.</li>
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</ul>
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<p>Next, install the protoc plugin for Go</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">$ go get -u github.com/golang/protobuf/protoc-gen-go</code></pre></div>
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<p>The compiler plugin, protoc-gen-go, will be installed in $GOBIN, defaulting to $GOPATH/bin. It must be in your $PATH for the protocol compiler, protoc, to find it.</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">$ export PATH<span style="color:#f92672">=</span>$PATH:$GOPATH/bin</code></pre></div>
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<h3 id="download-the-example">Download the example</h3>
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<p>The grpc code that was fetched with <code>go get google.golang.org/grpc</code> also contains the examples. They can be found under the examples dir: <code>$GOPATH/src/google.golang.org/grpc/examples</code>.</p>
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<h3 id="build-the-example">Build the example</h3>
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<p>Change to the example directory</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">$ cd $GOPATH/src/google.golang.org/grpc/examples/helloworld</code></pre></div>
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<p>gRPC services are defined in a <code>.proto</code> file, which is used to generate a corresponding <code>.pb.go</code> file. The <code>.pb.go</code> file is generated by compiling the <code>.proto</code> file using the protocol compiler: <code>protoc</code>.</p>
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<p>For the purpose of this example, the <code>helloworld.pb.go</code> file has already been generated (by compiling <code>helloworld.proto</code>), and can be found in this directory: <code>$GOPATH/src/google.golang.org/grpc/examples/helloworld/helloworld</code></p>
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<p>This <code>helloworld.pb.go</code> file contains:</p>
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<ul>
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<li>Generated client and server code.</li>
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<li>Code for populating, serializing, and retrieving our <code>HelloRequest</code> and <code>HelloReply</code> message types.</li>
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</ul>
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<h3 id="try-it">Try it!</h3>
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<p>To compile and run the server and client code, the <code>go run</code> command can be used.
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In the examples directory:</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">$ go run greeter_server/main.go</code></pre></div>
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<p>From a different terminal:</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">$ go run greeter_client/main.go</code></pre></div>
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<p>If things go smoothly, you will see the <code>Greeting: Hello world</code> in the client side output.</p>
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<p>Congratulations! You’ve just run a client-server application with gRPC.</p>
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<h3 id="update-a-grpc-service">Update a gRPC service</h3>
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<p>Now let’s look at how to update the application with an extra method on the
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server for the client to call. Our gRPC service is defined using protocol
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buffers; you can find out lots more about how to define a service in a <code>.proto</code>
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file in <a href="/docs/guides">What is gRPC?</a> and <a href="/docs/tutorials/basic/go/">gRPC Basics:
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Go</a>. For now all you need to know is that both the server and the client
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“stub” have a <code>SayHello</code> RPC method that takes a <code>HelloRequest</code> parameter from
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the client and returns a <code>HelloReply</code> from the server, and that this method
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is defined like this:</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-protobuf" data-lang="protobuf"><span style="color:#75715e">// The greeting service definition.
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</span><span style="color:#75715e"></span><span style="color:#66d9ef">service</span> Greeter {<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span> <span style="color:#75715e">// Sends a greeting
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</span><span style="color:#75715e"></span> <span style="color:#66d9ef">rpc</span> SayHello (HelloRequest) <span style="color:#66d9ef">returns</span> (HelloReply) {}<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span>}<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span><span style="color:#75715e">// The request message containing the user's name.
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</span><span style="color:#75715e"></span><span style="color:#66d9ef">message</span> <span style="color:#a6e22e">HelloRequest</span> {<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span> <span style="color:#66d9ef">string</span> name <span style="color:#f92672">=</span> <span style="color:#ae81ff">1</span>;<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span>}<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span><span style="color:#75715e">// The response message containing the greetings
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</span><span style="color:#75715e"></span><span style="color:#66d9ef">message</span> <span style="color:#a6e22e">HelloReply</span> {<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span> <span style="color:#66d9ef">string</span> <span style="color:#66d9ef">message</span> <span style="color:#f92672">=</span> <span style="color:#ae81ff">1</span>;<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span>}</code></pre></div>
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<p>Let’s update this so that the <code>Greeter</code> service has two methods. Make sure you are in the same examples dir as above (<code>$GOPATH/src/google.golang.org/grpc/examples/helloworld</code>)</p>
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<p>Edit <code>helloworld/helloworld.proto</code> and update it with a new <code>SayHelloAgain</code> method, with the same request and response
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types:</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-protobuf" data-lang="protobuf"><span style="color:#75715e">// The greeting service definition.
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</span><span style="color:#75715e"></span><span style="color:#66d9ef">service</span> Greeter {<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span> <span style="color:#75715e">// Sends a greeting
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</span><span style="color:#75715e"></span> <span style="color:#66d9ef">rpc</span> SayHello (HelloRequest) <span style="color:#66d9ef">returns</span> (HelloReply) {}<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span> <span style="color:#75715e">// Sends another greeting
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</span><span style="color:#75715e"></span> <span style="color:#66d9ef">rpc</span> SayHelloAgain (HelloRequest) <span style="color:#66d9ef">returns</span> (HelloReply) {}<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span>}<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span><span style="color:#75715e">// The request message containing the user's name.
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</span><span style="color:#75715e"></span><span style="color:#66d9ef">message</span> <span style="color:#a6e22e">HelloRequest</span> {<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span> <span style="color:#66d9ef">string</span> name <span style="color:#f92672">=</span> <span style="color:#ae81ff">1</span>;<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span>}<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span><span style="color:#75715e">// The response message containing the greetings
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</span><span style="color:#75715e"></span><span style="color:#66d9ef">message</span> <span style="color:#a6e22e">HelloReply</span> {<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span> <span style="color:#66d9ef">string</span> <span style="color:#66d9ef">message</span> <span style="color:#f92672">=</span> <span style="color:#ae81ff">1</span>;<span style="color:#960050;background-color:#1e0010">
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</span><span style="color:#960050;background-color:#1e0010"></span>}</code></pre></div>
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<h3 id="generate-grpc-code">Generate gRPC code</h3>
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<p>Next we need to update the gRPC code used by our application to use the new
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service definition. From the same examples dir as above (<code>$GOPATH/src/google.golang.org/grpc/examples/helloworld</code>)</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">$ protoc -I helloworld/ helloworld/helloworld.proto --go_out<span style="color:#f92672">=</span>plugins<span style="color:#f92672">=</span>grpc:helloworld</code></pre></div>
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<p>This regenerates the helloworld.pb.go with our new changes.</p>
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<h3 id="update-and-run-the-application">Update and run the application</h3>
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<p>We now have new generated server and client code, but we still need to implement
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and call the new method in the human-written parts of our example application.</p>
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<h4 id="update-the-server">Update the server</h4>
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<p>Edit <code>greeter_server/main.go</code> and add the following function to it:</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-go" data-lang="go"><span style="color:#66d9ef">func</span> (<span style="color:#a6e22e">s</span> <span style="color:#f92672">*</span><span style="color:#a6e22e">server</span>) <span style="color:#a6e22e">SayHelloAgain</span>(<span style="color:#a6e22e">ctx</span> <span style="color:#a6e22e">context</span>.<span style="color:#a6e22e">Context</span>, <span style="color:#a6e22e">in</span> <span style="color:#f92672">*</span><span style="color:#a6e22e">pb</span>.<span style="color:#a6e22e">HelloRequest</span>) (<span style="color:#f92672">*</span><span style="color:#a6e22e">pb</span>.<span style="color:#a6e22e">HelloReply</span>, <span style="color:#66d9ef">error</span>) {
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<span style="color:#66d9ef">return</span> <span style="color:#f92672">&</span><span style="color:#a6e22e">pb</span>.<span style="color:#a6e22e">HelloReply</span>{<span style="color:#a6e22e">Message</span>: <span style="color:#e6db74">"Hello again "</span> <span style="color:#f92672">+</span> <span style="color:#a6e22e">in</span>.<span style="color:#a6e22e">Name</span>}, <span style="color:#66d9ef">nil</span>
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}</code></pre></div>
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<h4 id="update-the-client">Update the client</h4>
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<p>Edit <code>greeter_client/main.go</code> to add the following code to the main function.</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-go" data-lang="go"><span style="color:#a6e22e">r</span>, <span style="color:#a6e22e">err</span> = <span style="color:#a6e22e">c</span>.<span style="color:#a6e22e">SayHelloAgain</span>(<span style="color:#a6e22e">ctx</span>, <span style="color:#f92672">&</span><span style="color:#a6e22e">pb</span>.<span style="color:#a6e22e">HelloRequest</span>{<span style="color:#a6e22e">Name</span>: <span style="color:#a6e22e">name</span>})
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<span style="color:#66d9ef">if</span> <span style="color:#a6e22e">err</span> <span style="color:#f92672">!=</span> <span style="color:#66d9ef">nil</span> {
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<span style="color:#a6e22e">log</span>.<span style="color:#a6e22e">Fatalf</span>(<span style="color:#e6db74">"could not greet: %v"</span>, <span style="color:#a6e22e">err</span>)
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}
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<span style="color:#a6e22e">log</span>.<span style="color:#a6e22e">Printf</span>(<span style="color:#e6db74">"Greeting: %s"</span>, <span style="color:#a6e22e">r</span>.<span style="color:#a6e22e">Message</span>)</code></pre></div>
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<h4 id="run">Run!</h4>
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<p>Run the server</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">$ go run greeter_server/main.go</code></pre></div>
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<p>On a different terminal, run the client</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">$ go run greeter_client/main.go</code></pre></div>
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<p>You should see the updated output:</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">$ go run greeter_client/main.go
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Greeting: Hello world
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Greeting: Hello again world</code></pre></div>
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<h3 id="what-s-next">What’s next</h3>
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<ul>
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<li>Read a full explanation of how gRPC works in <a href="/docs/guides/">What is gRPC?</a>
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and <a href="/docs/guides/concepts/">gRPC Concepts</a></li>
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<li>Work through a more detailed tutorial in <a href="/docs/tutorials/basic/go/">gRPC Basics: Go</a></li>
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<li>Explore the gRPC Go core API in its <a href="https://godoc.org/google.golang.org/grpc">reference
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documentation</a></li>
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</ul>
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</div>
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</div>
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