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<title>Microservices with NodeJS, Express.js and RabbitMQ Part 1 - Sipmann</title>
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<h1><b><a href="https://www.sipmann.com/microservices_nodejs_express_rabbitmq_part_1.html" title="Permalink to Microservices with NodeJS, Express.js and RabbitMQ Part 1">Microservices with NodeJS, Express.js and RabbitMQ Part 1</a></b></h1>
<h5>
<i class="fa fa-calendar"></i><time class="w3-opacity" datetime="2018-04-04T11:25:00-03:00"> Wed 04 April 2018</time>
</h5>
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<div class="w3-container">
<p><p>This is the first part of a microservices development series. The service will consist of the bellow architecture, where we will expose an image optimizer service that will forward the request to a <a class="reference external" href="https://www.rabbitmq.com/">RabbitMQ</a> queue and answer with the bytecode of the optimized image. It shouldn't be a long series so let's see what we can do.</p>
<img alt="Service architecture" src="/images/microservices_rabit_pt1.png" />
<p>Let's get our environment working. First, we'll need to install the libraries that we'll use.</p>
<p>Create a dir and initialize the nodejs application inside it (<cite>npm init</cite>) and then let's install the deps.</p>
<ul class="simple">
<li>amqplib - AMQP lib to interact with rabbitmq</li>
<li>express - Do our basic rest API</li>
<li>express-fileupload - easy file upload parser</li>
<li>imagemin and imagemin-pngquant - our image compacter</li>
</ul>
<div class="highlight"><pre><span></span>npm install --save express amqplib express-fileupload imagemin imagemin-pngquant
</pre></div>
<p>Now let's write the entry points for our service, we'll have two basic entry points. The path <cite>/</cite> that will have a welcome message, the second path will be <cite>/upload</cite> and this is the one that will handle the image and produce a job for our workers.</p>
<div class="highlight"><pre><span></span><span class="kr">const</span> <span class="nx">express</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'express'</span><span class="p">);</span>
<span class="kr">const</span> <span class="nx">fileUpload</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'express-fileupload'</span><span class="p">);</span>
<span class="c1">//Instantiate the app and set the fileupload parser to manage files</span>
<span class="kr">const</span> <span class="nx">app</span> <span class="o">=</span> <span class="nx">express</span><span class="p">();</span>
<span class="nx">app</span><span class="p">.</span><span class="nx">use</span><span class="p">(</span><span class="nx">fileUpload</span><span class="p">());</span>
<span class="c1">//Our index entry point</span>
<span class="nx">app</span><span class="p">.</span><span class="nx">get</span><span class="p">(</span><span class="s1">'/'</span><span class="p">,</span> <span class="p">(</span><span class="nx">req</span><span class="p">,</span> <span class="nx">res</span><span class="p">)</span> <span class="p">=></span> <span class="nx">res</span><span class="p">.</span><span class="nx">send</span><span class="p">(</span><span class="s1">'Hello From ImageCompacter service'</span><span class="p">));</span>
<span class="c1">//The path that will handle the image file and throw them to the queue</span>
<span class="nx">app</span><span class="p">.</span><span class="nx">post</span><span class="p">(</span><span class="s1">'/upload'</span><span class="p">,</span> <span class="p">(</span><span class="nx">req</span><span class="p">,</span> <span class="nx">res</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
<span class="c1">//With express-fileupload we can grab the files like this</span>
<span class="kd">let</span> <span class="nx">img</span> <span class="o">=</span> <span class="nx">req</span><span class="p">.</span><span class="nx">files</span><span class="p">.</span><span class="nx">image</span><span class="p">;</span> <span class="c1">//"image" is the name of the input</span>
<span class="nx">res</span><span class="p">.</span><span class="nx">send</span><span class="p">(</span><span class="s1">'Not ready yet'</span><span class="p">);</span>
<span class="p">});</span>
<span class="c1">//Finally start the app with the given port number</span>
<span class="nx">app</span><span class="p">.</span><span class="nx">listen</span><span class="p">(</span><span class="mi">4000</span><span class="p">,</span> <span class="p">()</span> <span class="p">=></span> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s1">'Example app listening on port 4000!'</span><span class="p">));</span>
</pre></div>
<p>Let's check if it works, run the service with node.</p>
<div class="highlight"><pre><span></span>node index.js
Example app listening on port <span class="m">4000</span>!
</pre></div>
<p>Open the browser and check if it prints our hello message when accessing <cite>localhost:4000</cite>. Works? Greate. Now let's work with the image and see how we do it. To optimize our image, we'll use the library imagemin and <a class="reference external" href="https://www.npmjs.com/package/imagemin-pngquant">imagemin-pngquant</a>, it will be that simple for now, we'll work with rabbitmq latter.</p>
<div class="highlight"><pre><span></span><span class="kr">const</span> <span class="nx">imagemin</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'imagemin'</span><span class="p">);</span>
<span class="kr">const</span> <span class="nx">imageminPngquant</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'imagemin-pngquant'</span><span class="p">);</span>
<span class="c1">//...</span>
<span class="c1">//The path that will handle the image file and throw them to the queue</span>
<span class="nx">app</span><span class="p">.</span><span class="nx">post</span><span class="p">(</span><span class="s1">'/upload'</span><span class="p">,</span> <span class="p">(</span><span class="nx">req</span><span class="p">,</span> <span class="nx">res</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
<span class="kd">let</span> <span class="nx">img</span> <span class="o">=</span> <span class="nx">req</span><span class="p">.</span><span class="nx">files</span><span class="p">.</span><span class="nx">image</span><span class="p">;</span> <span class="c1">//"image" is the name of the input</span>
<span class="nx">imagemin</span><span class="p">.</span><span class="nx">buffer</span><span class="p">(</span><span class="nx">img</span><span class="p">.</span><span class="nx">data</span><span class="p">,</span> <span class="p">{</span>
<span class="nx">plugins</span><span class="o">:</span> <span class="p">[</span><span class="nx">imageminPngquant</span><span class="p">()]</span>
<span class="p">})</span>
<span class="p">.</span><span class="nx">then</span><span class="p">(</span><span class="nx">out</span> <span class="p">=></span> <span class="p">{</span>
<span class="nx">res</span><span class="p">.</span><span class="nx">write</span><span class="p">(</span><span class="nx">out</span><span class="p">,</span><span class="s1">'binary'</span><span class="p">);</span>
<span class="nx">res</span><span class="p">.</span><span class="nx">end</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="s1">'binary'</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="c1">//...</span>
</pre></div>
<p>Use <a class="reference external" href="https://www.getpostman.com/">Postman</a> to test the request. To see if it will work, make a request to <cite>http://localhost:4000/upload</cite> with a formdata with a file. Select the "send and Download" instead of "Send" and you should have an image after that. Bellow an image of how your postman should be.</p>
<img alt="Postman" src="/images/microservice_postman.png" />
<p>That's it for today, next week we'll change our code to use RabbitMQ.</p>
</p>
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<h4>Translations:</h4>
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</ul>
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<h4>Related Posts:</h4>
<ul>
<li><a href="https://www.sipmann.com/microservices_nodejs_express_rabbitmq_part_2.html">Microservices with NodeJS, Express.js and RabbitMQ Part 2</a></li>
<li><a href="https://www.sipmann.com/scaffolding_react_app_with_parcel_yeoman.html">Scaffolding a React app with Parcel and Yeoman</a></li>
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