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            <h1><b><a href="https://www.sipmann.com/monitoring-website-heath-with-azure-functions.html" title="Permalink to Monitoring a Website heath with Azure Functions">Monitoring a Website heath with Azure Functions</a></b></h1>
            <h5>
                <i class="fa fa-calendar"></i><time class="w3-opacity" datetime="2020-06-22T19:00:00-03:00"> Mon 22 June 2020</time>
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            <p><p>Sometimes you get your self in need to monitor a website's health or it's content for changes. Of course, there's plenty of options out there, but for the sake of curiosity, let's code our own to see what we can do. First things first. Everything you'll see here, you can achieve with the <a href="https://azure.microsoft.com/free/">free tier</a> of azure.</p>
<p>The main idea of our app will be to monitor website health (status code). To create a new Azure Function Project, follow the steps below.</p>
<p><img alt="Steps to create a azure function project" src="/images/azure_functions.gif"></p>
<p>After creating the project, you'll have a few files. Open your main file and start coding. The main file will have a function called <code>Run</code>  and you can code your request method. I've created an <code>async</code> method to make the request and log the output at the console. The full code you can see below.</p>
<div class="highlight"><pre><span></span><code><span class="k">using</span> <span class="nn">System</span><span class="p">;</span>
<span class="k">using</span> <span class="nn">System.Linq</span><span class="p">;</span>
<span class="k">using</span> <span class="nn">System.Net.Http</span><span class="p">;</span>
<span class="k">using</span> <span class="nn">System.Threading.Tasks</span><span class="p">;</span>
<span class="k">using</span> <span class="nn">Microsoft.Azure.WebJobs</span><span class="p">;</span>
<span class="k">using</span> <span class="nn">Microsoft.Azure.WebJobs.Host</span><span class="p">;</span>
<span class="k">using</span> <span class="nn">Microsoft.Extensions.Logging</span><span class="p">;</span>

<span class="k">namespace</span> <span class="nn">Sipmann.CheckMySite</span>
<span class="p">{</span>
    <span class="k">public</span> <span class="k">static</span> <span class="k">class</span> <span class="nc">HttpCheck</span>
    <span class="p">{</span>

        <span class="k">private</span> <span class="k">static</span> <span class="k">async</span> <span class="n">Task</span> <span class="nf">GetTask</span><span class="p">(</span><span class="kt">string</span> <span class="n">url</span><span class="p">,</span> <span class="n">ILogger</span> <span class="n">log</span><span class="p">)</span>
        <span class="p">{</span>
            <span class="kt">var</span> <span class="n">request</span> <span class="p">=</span> <span class="k">new</span> <span class="n">HttpRequestMessage</span><span class="p">(</span><span class="n">HttpMethod</span><span class="p">.</span><span class="n">Get</span><span class="p">,</span> <span class="n">url</span><span class="p">);</span>

            <span class="kt">var</span> <span class="n">client</span> <span class="p">=</span> <span class="k">new</span> <span class="n">HttpClient</span><span class="p">();</span>
            <span class="kt">var</span> <span class="n">response</span> <span class="p">=</span> <span class="k">await</span> <span class="n">client</span><span class="p">.</span><span class="n">SendAsync</span><span class="p">(</span><span class="n">request</span><span class="p">);</span>

            <span class="k">if</span> <span class="p">(</span><span class="n">response</span><span class="p">.</span><span class="n">IsSuccessStatusCode</span><span class="p">)</span>
            <span class="p">{</span>
                <span class="n">log</span><span class="p">.</span><span class="n">LogInformation</span><span class="p">(</span><span class="err">$</span><span class="s">&quot;URL ${url} esta OK&quot;</span><span class="p">);</span>
            <span class="p">}</span>
            <span class="k">else</span>
            <span class="p">{</span>
                <span class="n">log</span><span class="p">.</span><span class="n">LogInformation</span><span class="p">(</span><span class="err">$</span><span class="s">&quot;URL ${url} não esta OK&quot;</span><span class="p">);</span>
            <span class="p">}</span>
        <span class="p">}</span>

<span class="na">        [FunctionName(&quot;HttpCheck&quot;)]</span>
        <span class="k">public</span> <span class="k">static</span> <span class="k">void</span> <span class="nf">Run</span><span class="p">([</span><span class="n">TimerTrigger</span><span class="p">(</span><span class="s">&quot;0 */5 * * * *&quot;</span><span class="p">)]</span><span class="n">TimerInfo</span> <span class="n">myTimer</span><span class="p">,</span> <span class="n">ILogger</span> <span class="n">log</span><span class="p">)</span>
        <span class="p">{</span>
            <span class="kt">var</span> <span class="n">urls</span> <span class="p">=</span> <span class="k">new</span><span class="p">[]{</span><span class="s">&quot;https://www.sipmann.com&quot;</span><span class="p">,</span> <span class="s">&quot;https://www.canezecanez.com.br&quot;</span><span class="p">};</span>

            <span class="c1">// Start every request and wait for them all to complete</span>
            <span class="n">Task</span><span class="p">.</span><span class="n">WaitAll</span><span class="p">(</span><span class="n">urls</span><span class="p">.</span><span class="n">Select</span><span class="p">(</span><span class="n">url</span> <span class="p">=&gt;</span> <span class="n">GetTask</span><span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="n">log</span><span class="p">)).</span><span class="n">ToArray</span><span class="p">());</span>
            <span class="n">log</span><span class="p">.</span><span class="n">LogInformation</span><span class="p">(</span><span class="err">$</span><span class="s">&quot;Finalizou a fila&quot;</span><span class="p">);</span>
        <span class="p">}</span>
    <span class="p">}</span>
<span class="p">}</span>
</code></pre></div>

<p>Now you can enhance the function and maybe send some alerts like a Telegram message when one of your sites went down.</p></p>
        </div>


        <hr>
        <section class="w3-padding" id="translations">
            <h4>Translations:</h4>
            <ul>
                <li><a href="../pt/monitoring-website-heath-with-azure-functions.html">pt - Monitorando a disponibilidade de um Website com Azure Functions</a></li>
            </ul>
        </section>

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