iframe-proxy | Sunbelt Computer Software

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                    Asynchronous Python
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            <p class="subtitle is-5">
                Thu 01 January 2015
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            <p>It's possible to get python to do node-like non-blocking requests, this could
take away one of the key reasons for using node.</p>
<p>The following is a full bottle-based python web application.</p>
<p>A client can sucessfully call /test while another client is waiting for
/slowproxy to return a result from a slow web service.</p>
<div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">gevent</span> <span class="kn">import</span> <span class="n">monkey</span><span class="p">;</span> <span class="n">monkey</span><span class="o">.</span><span class="n">patch_all</span><span class="p">()</span>
<span class="kn">from</span> <span class="nn">bottle</span> <span class="kn">import</span> <span class="n">route</span><span class="p">,</span> <span class="n">run</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="nd">@route</span><span class="p">(</span><span class="s1">&#39;/sleep/&lt;seconds:int&gt;&#39;</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">sleep</span><span class="p">(</span><span class="n">seconds</span><span class="p">):</span>
    <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="n">seconds</span><span class="p">)</span>
    <span class="k">return</span> <span class="s2">&quot;Slept For {0}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">seconds</span><span class="p">)</span>
<span class="nd">@route</span><span class="p">(</span><span class="s1">&#39;/test&#39;</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">test</span><span class="p">():</span>
     <span class="k">return</span> <span class="s1">&#39;test&#39;</span>
<span class="nd">@route</span><span class="p">(</span><span class="s1">&#39;/slowproxy/&lt;seconds:int&gt;&#39;</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">slowproxy</span><span class="p">(</span><span class="n">seconds</span><span class="p">):</span>
    <span class="kn">import</span> <span class="nn">requests</span>
    <span class="n">url</span><span class="o">=</span><span class="s2">&quot;https://s.nooro.com/sleeptest.php?seconds=</span><span class="si">%i</span><span class="s2">&quot;</span> <span class="o">%</span><span class="n">seconds</span>
    <span class="n">response</span><span class="o">=</span><span class="n">requests</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">url</span><span class="p">)</span>
    <span class="n">response</span><span class="o">.</span><span class="n">raise_for_status</span><span class="p">()</span>
    <span class="k">return</span> <span class="n">response</span><span class="o">.</span><span class="n">text</span>
<span class="n">run</span><span class="p">(</span><span class="n">host</span><span class="o">=</span><span class="s1">&#39;0.0.0.0&#39;</span><span class="p">,</span> <span class="n">port</span><span class="o">=</span><span class="mi">8080</span><span class="p">,</span><span class="n">server</span><span class="o">=</span><span class="s1">&#39;gevent&#39;</span><span class="p">)</span>
</pre></div>
<p>My first attempt used grequests, but apparently that's not even necessary.</p>
<p>I guess that the call to monkey.patch_all() even patches the socket code
that requests uses.  I'm very impressed.</p>
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