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<div class="section" id="basic-usage">
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<h1>Basic Usage<a class="headerlink" href="#basic-usage" title="Permalink to this headline">¶</a></h1>
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<p>If it’s your first time to Eventlet, you may find the illuminated examples in the <a class="reference internal" href="design_patterns.html#design-patterns"><span class="std std-ref">Design Patterns</span></a> document to be a good starting point.</p>
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<p>Eventlet is built around the concept of green threads (i.e. coroutines, we use the terms interchangeably) that are launched to do network-related work. Green threads differ from normal threads in two main ways:</p>
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<ul class="simple">
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<li>Green threads are so cheap they are nearly free. You do not have to conserve green threads like you would normal threads. In general, there will be at least one green thread per network connection.</li>
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<li>Green threads cooperatively yield to each other instead of preemptively being scheduled. The major advantage from this behavior is that shared data structures don’t need locks, because only if a yield is explicitly called can another green thread have access to the data structure. It is also possible to inspect primitives such as queues to see if they have any pending data.</li>
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</ul>
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</div>
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<div class="section" id="primary-api">
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<h1>Primary API<a class="headerlink" href="#primary-api" title="Permalink to this headline">¶</a></h1>
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<p>The design goal for Eventlet’s API is simplicity and readability. You should be able to read its code and understand what it’s doing. Fewer lines of code are preferred over excessively clever implementations. <a class="reference external" href="http://www.python.org/dev/peps/pep-0020/">Like Python itself</a>, there should be one, and only one obvious way to do it in Eventlet!</p>
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<p>Though Eventlet has many modules, much of the most-used stuff is accessible simply by doing <code class="docutils literal"><span class="pre">import</span> <span class="pre">eventlet</span></code>. Here’s a quick summary of the functionality available in the <code class="docutils literal"><span class="pre">eventlet</span></code> module, with links to more verbose documentation on each.</p>
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<div class="section" id="greenthread-spawn">
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<h2>Greenthread Spawn<a class="headerlink" href="#greenthread-spawn" title="Permalink to this headline">¶</a></h2>
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<dl class="function">
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<dt id="eventlet.spawn">
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<code class="descclassname">eventlet.</code><code class="descname">spawn</code><span class="sig-paren">(</span><em>func</em>, <em>*args</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#eventlet.spawn" title="Permalink to this definition">¶</a></dt>
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<dd><p>This launches a greenthread to call <em>func</em>. Spawning off multiple greenthreads gets work done in parallel. The return value from <code class="docutils literal"><span class="pre">spawn</span></code> is a <code class="xref py py-class docutils literal"><span class="pre">greenthread.GreenThread</span></code> object, which can be used to retrieve the return value of <em>func</em>. See <a class="reference internal" href="modules/greenthread.html#eventlet.greenthread.spawn" title="eventlet.greenthread.spawn"><code class="xref py py-func docutils literal"><span class="pre">spawn</span></code></a> for more details.</p>
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</dd></dl>
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<dl class="function">
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<dt id="eventlet.spawn_n">
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<code class="descclassname">eventlet.</code><code class="descname">spawn_n</code><span class="sig-paren">(</span><em>func</em>, <em>*args</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#eventlet.spawn_n" title="Permalink to this definition">¶</a></dt>
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<dd><p>The same as <code class="xref py py-func docutils literal"><span class="pre">spawn()</span></code>, but it’s not possible to know how the function terminated (i.e. no return value or exceptions). This makes execution faster. See <a class="reference internal" href="modules/greenthread.html#eventlet.greenthread.spawn_n" title="eventlet.greenthread.spawn_n"><code class="xref py py-func docutils literal"><span class="pre">spawn_n</span></code></a> for more details.</p>
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</dd></dl>
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<dl class="function">
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<dt id="eventlet.spawn_after">
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<code class="descclassname">eventlet.</code><code class="descname">spawn_after</code><span class="sig-paren">(</span><em>seconds</em>, <em>func</em>, <em>*args</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#eventlet.spawn_after" title="Permalink to this definition">¶</a></dt>
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<dd><p>Spawns <em>func</em> after <em>seconds</em> have elapsed; a delayed version of <code class="xref py py-func docutils literal"><span class="pre">spawn()</span></code>. To abort the spawn and prevent <em>func</em> from being called, call <code class="xref py py-meth docutils literal"><span class="pre">GreenThread.cancel()</span></code> on the return value of <code class="xref py py-func docutils literal"><span class="pre">spawn_after()</span></code>. See <a class="reference internal" href="modules/greenthread.html#eventlet.greenthread.spawn_after" title="eventlet.greenthread.spawn_after"><code class="xref py py-func docutils literal"><span class="pre">spawn_after</span></code></a> for more details.</p>
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</dd></dl>
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</div>
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<div class="section" id="greenthread-control">
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<h2>Greenthread Control<a class="headerlink" href="#greenthread-control" title="Permalink to this headline">¶</a></h2>
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<dl class="function">
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<dt id="eventlet.sleep">
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<code class="descclassname">eventlet.</code><code class="descname">sleep</code><span class="sig-paren">(</span><em>seconds=0</em><span class="sig-paren">)</span><a class="headerlink" href="#eventlet.sleep" title="Permalink to this definition">¶</a></dt>
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<dd><p>Suspends the current greenthread and allows others a chance to process. See <a class="reference internal" href="modules/greenthread.html#eventlet.greenthread.sleep" title="eventlet.greenthread.sleep"><code class="xref py py-func docutils literal"><span class="pre">sleep</span></code></a> for more details.</p>
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</dd></dl>
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<dl class="class">
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<dt id="eventlet.GreenPool">
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<em class="property">class </em><code class="descclassname">eventlet.</code><code class="descname">GreenPool</code><a class="headerlink" href="#eventlet.GreenPool" title="Permalink to this definition">¶</a></dt>
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<dd><p>Pools control concurrency. It’s very common in applications to want to consume only a finite amount of memory, or to restrict the amount of connections that one part of the code holds open so as to leave more for the rest, or to behave consistently in the face of unpredictable input data. GreenPools provide this control. See <a class="reference internal" href="modules/greenpool.html#eventlet.greenpool.GreenPool" title="eventlet.greenpool.GreenPool"><code class="xref py py-class docutils literal"><span class="pre">GreenPool</span></code></a> for more on how to use these.</p>
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</dd></dl>
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<dl class="class">
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<dt id="eventlet.GreenPile">
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<em class="property">class </em><code class="descclassname">eventlet.</code><code class="descname">GreenPile</code><a class="headerlink" href="#eventlet.GreenPile" title="Permalink to this definition">¶</a></dt>
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<dd><p>GreenPile objects represent chunks of work. In essence a GreenPile is an iterator that can be stuffed with work, and the results read out later. See <a class="reference internal" href="modules/greenpool.html#eventlet.greenpool.GreenPile" title="eventlet.greenpool.GreenPile"><code class="xref py py-class docutils literal"><span class="pre">GreenPile</span></code></a> for more details.</p>
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</dd></dl>
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<dl class="class">
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<dt id="eventlet.Queue">
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<em class="property">class </em><code class="descclassname">eventlet.</code><code class="descname">Queue</code><a class="headerlink" href="#eventlet.Queue" title="Permalink to this definition">¶</a></dt>
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<dd><p>Queues are a fundamental construct for communicating data between execution units. Eventlet’s Queue class is used to communicate between greenthreads, and provides a bunch of useful features for doing that. See <a class="reference internal" href="modules/queue.html#eventlet.queue.Queue" title="eventlet.queue.Queue"><code class="xref py py-class docutils literal"><span class="pre">Queue</span></code></a> for more details.</p>
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</dd></dl>
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<dl class="class">
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<dt id="eventlet.Timeout">
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<em class="property">class </em><code class="descclassname">eventlet.</code><code class="descname">Timeout</code><a class="headerlink" href="#eventlet.Timeout" title="Permalink to this definition">¶</a></dt>
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<dd><p>This class is a way to add timeouts to anything. It raises <em>exception</em> in the current greenthread after <em>timeout</em> seconds. When <em>exception</em> is omitted or <code class="docutils literal"><span class="pre">None</span></code>, the Timeout instance itself is raised.</p>
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<p>Timeout objects are context managers, and so can be used in with statements.
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See <a class="reference internal" href="modules/timeout.html#eventlet.timeout.Timeout" title="eventlet.timeout.Timeout"><code class="xref py py-class docutils literal"><span class="pre">Timeout</span></code></a> for more details.</p>
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</dd></dl>
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</div>
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<div class="section" id="patching-functions">
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<h2>Patching Functions<a class="headerlink" href="#patching-functions" title="Permalink to this headline">¶</a></h2>
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<dl class="function">
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<dt id="eventlet.import_patched">
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<code class="descclassname">eventlet.</code><code class="descname">import_patched</code><span class="sig-paren">(</span><em>modulename</em>, <em>*additional_modules</em>, <em>**kw_additional_modules</em><span class="sig-paren">)</span><a class="headerlink" href="#eventlet.import_patched" title="Permalink to this definition">¶</a></dt>
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<dd><p>Imports a module in a way that ensures that the module uses “green” versions of the standard library modules, so that everything works nonblockingly. The only required argument is the name of the module to be imported. For more information see <a class="reference internal" href="patching.html#import-green"><span class="std std-ref">Import Green</span></a>.</p>
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</dd></dl>
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<dl class="function">
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<dt id="eventlet.monkey_patch">
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<code class="descclassname">eventlet.</code><code class="descname">monkey_patch</code><span class="sig-paren">(</span><em>all=True</em>, <em>os=False</em>, <em>select=False</em>, <em>socket=False</em>, <em>thread=False</em>, <em>time=False</em><span class="sig-paren">)</span><a class="headerlink" href="#eventlet.monkey_patch" title="Permalink to this definition">¶</a></dt>
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<dd><p>Globally patches certain system modules to be greenthread-friendly. The keyword arguments afford some control over which modules are patched. If <em>all</em> is True, then all modules are patched regardless of the other arguments. If it’s False, then the rest of the keyword arguments control patching of specific subsections of the standard library. Most patch the single module of the same name (os, time, select). The exceptions are socket, which also patches the ssl module if present; and thread, which patches thread, threading, and Queue. It’s safe to call monkey_patch multiple times. For more information see <a class="reference internal" href="patching.html#monkey-patch"><span class="std std-ref">Monkeypatching the Standard Library</span></a>.</p>
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</dd></dl>
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</div>
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<div class="section" id="network-convenience-functions">
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<h2>Network Convenience Functions<a class="headerlink" href="#network-convenience-functions" title="Permalink to this headline">¶</a></h2>
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<dl class="function">
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<dt id="eventlet.connect">
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<code class="descclassname">eventlet.</code><code class="descname">connect</code><span class="sig-paren">(</span><em>addr</em>, <em>family=<AddressFamily.AF_INET: 2></em>, <em>bind=None</em><span class="sig-paren">)</span><a class="headerlink" href="#eventlet.connect" title="Permalink to this definition">¶</a></dt>
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<dd><p>Convenience function for opening client sockets.</p>
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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
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<li><strong>addr</strong> – Address of the server to connect to. For TCP sockets, this is a (host, port) tuple.</li>
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<li><strong>family</strong> – Socket family, optional. See <a class="reference external" href="https://docs.python.org/2/library/socket.html#module-socket" title="(in Python v2.7)"><code class="xref py py-mod docutils literal"><span class="pre">socket</span></code></a> documentation for available families.</li>
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<li><strong>bind</strong> – Local address to bind to, optional.</li>
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</ul>
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</td>
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</tr>
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<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">The connected green socket object.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</dd></dl>
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<dl class="function">
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<dt id="eventlet.listen">
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<code class="descclassname">eventlet.</code><code class="descname">listen</code><span class="sig-paren">(</span><em>addr</em>, <em>family=<AddressFamily.AF_INET: 2></em>, <em>backlog=50</em><span class="sig-paren">)</span><a class="headerlink" href="#eventlet.listen" title="Permalink to this definition">¶</a></dt>
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<dd><p>Convenience function for opening server sockets. This
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socket can be used in <a class="reference internal" href="#eventlet.serve" title="eventlet.serve"><code class="xref py py-func docutils literal"><span class="pre">serve()</span></code></a> or a custom <code class="docutils literal"><span class="pre">accept()</span></code> loop.</p>
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<p>Sets SO_REUSEADDR on the socket to save on annoyance.</p>
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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
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<li><strong>addr</strong> – Address to listen on. For TCP sockets, this is a (host, port) tuple.</li>
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<li><strong>family</strong> – Socket family, optional. See <a class="reference external" href="https://docs.python.org/2/library/socket.html#module-socket" title="(in Python v2.7)"><code class="xref py py-mod docutils literal"><span class="pre">socket</span></code></a> documentation for available families.</li>
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<li><strong>backlog</strong> – The maximum number of queued connections. Should be at least 1; the maximum
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value is system-dependent.</li>
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</ul>
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</td>
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</tr>
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<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">The listening green socket object.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</dd></dl>
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<dl class="function">
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<dt id="eventlet.wrap_ssl">
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<code class="descclassname">eventlet.</code><code class="descname">wrap_ssl</code><span class="sig-paren">(</span><em>sock</em>, <em>*a</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#eventlet.wrap_ssl" title="Permalink to this definition">¶</a></dt>
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<dd><p>Convenience function for converting a regular socket into an
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SSL socket. Has the same interface as <a class="reference external" href="https://docs.python.org/2/library/ssl.html#ssl.wrap_socket" title="(in Python v2.7)"><code class="xref py py-func docutils literal"><span class="pre">ssl.wrap_socket()</span></code></a>,
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but can also use PyOpenSSL. Though, note that it ignores the
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<cite>cert_reqs</cite>, <cite>ssl_version</cite>, <cite>ca_certs</cite>, <cite>do_handshake_on_connect</cite>,
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and <cite>suppress_ragged_eofs</cite> arguments when using PyOpenSSL.</p>
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<p>The preferred idiom is to call wrap_ssl directly on the creation
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method, e.g., <code class="docutils literal"><span class="pre">wrap_ssl(connect(addr))</span></code> or
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<code class="docutils literal"><span class="pre">wrap_ssl(listen(addr),</span> <span class="pre">server_side=True)</span></code>. This way there is
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no “naked” socket sitting around to accidentally corrupt the SSL
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session.</p>
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<p>:return Green SSL object.</p>
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</dd></dl>
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<dl class="function">
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<dt id="eventlet.serve">
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<code class="descclassname">eventlet.</code><code class="descname">serve</code><span class="sig-paren">(</span><em>sock</em>, <em>handle</em>, <em>concurrency=1000</em><span class="sig-paren">)</span><a class="headerlink" href="#eventlet.serve" title="Permalink to this definition">¶</a></dt>
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<dd><p>Runs a server on the supplied socket. Calls the function <em>handle</em> in a
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separate greenthread for every incoming client connection. <em>handle</em> takes
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two arguments: the client socket object, and the client address:</p>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">myhandle</span><span class="p">(</span><span class="n">client_sock</span><span class="p">,</span> <span class="n">client_addr</span><span class="p">):</span>
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<span class="nb">print</span><span class="p">(</span><span class="s2">"client connected"</span><span class="p">,</span> <span class="n">client_addr</span><span class="p">)</span>
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<span class="n">eventlet</span><span class="o">.</span><span class="n">serve</span><span class="p">(</span><span class="n">eventlet</span><span class="o">.</span><span class="n">listen</span><span class="p">((</span><span class="s1">'127.0.0.1'</span><span class="p">,</span> <span class="mi">9999</span><span class="p">)),</span> <span class="n">myhandle</span><span class="p">)</span>
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</pre></div>
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</div>
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<p>Returning from <em>handle</em> closes the client socket.</p>
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<p><code class="xref py py-func docutils literal"><span class="pre">serve()</span></code> blocks the calling greenthread; it won’t return until
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the server completes. If you desire an immediate return,
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spawn a new greenthread for <code class="xref py py-func docutils literal"><span class="pre">serve()</span></code>.</p>
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<p>Any uncaught exceptions raised in <em>handle</em> are raised as exceptions
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from <code class="xref py py-func docutils literal"><span class="pre">serve()</span></code>, terminating the server, so be sure to be aware of the
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exceptions your application can raise. The return value of <em>handle</em> is
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ignored.</p>
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<p>Raise a <a class="reference internal" href="#eventlet.StopServe" title="eventlet.StopServe"><code class="xref py py-class docutils literal"><span class="pre">StopServe</span></code></a> exception to gracefully terminate the
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server – that’s the only way to get the server() function to return rather
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than raise.</p>
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<p>The value in <em>concurrency</em> controls the maximum number of
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greenthreads that will be open at any time handling requests. When
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the server hits the concurrency limit, it stops accepting new
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connections until the existing ones complete.</p>
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</dd></dl>
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<dl class="class">
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<dt id="eventlet.StopServe">
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<em class="property">class </em><code class="descclassname">eventlet.</code><code class="descname">StopServe</code><a class="headerlink" href="#eventlet.StopServe" title="Permalink to this definition">¶</a></dt>
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<dd><p>Exception class used for quitting <a class="reference internal" href="#eventlet.serve" title="eventlet.serve"><code class="xref py py-func docutils literal"><span class="pre">serve()</span></code></a> gracefully.</p>
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</dd></dl>
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<p>These are the basic primitives of Eventlet; there are a lot more out there in the other Eventlet modules; check out the <a class="reference internal" href="modules.html"><span class="doc">Module Reference</span></a>.</p>
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