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class="reference internal" href="../api/gevent.greenlet.html">Greenlet Objects</a></li> <li class="toctree-l1"><a class="reference internal" href="../servers.html">Implementing servers</a></li> <li class="toctree-l1 has-children"><a class="reference internal" href="../dns.html">Name Resolution (DNS)</a><input class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" role="switch" type="checkbox"/><label for="toctree-checkbox-2"><div class="visually-hidden">Toggle navigation of Name Resolution (DNS)</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.resolver.thread.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.thread</span></code> – thread based hostname resolver</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.resolver.ares.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.ares</span></code> – c-ares based hostname resolver</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.resolver.dnspython.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.dnspython</span></code> – Pure Python hostname resolver</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.resolver.blocking.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.blocking</span></code> – Non-cooperative resolver</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="../monitoring.html">Monitoring and Debugging gevent Applications</a></li> <li class="toctree-l1"><a class="reference internal" href="../loop_impls.html">Event Loop Implementations: libuv and libev</a></li> <li class="toctree-l1"><a class="reference internal" href="../configuration.html">Configuring gevent</a></li> </ul> <ul class="current"> <li class="toctree-l1 current has-children"><a class="reference internal" href="../api/index.html">API reference</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-3" name="toctree-checkbox-3" role="switch" type="checkbox"/><label for="toctree-checkbox-3"><div class="visually-hidden">Toggle navigation of API reference</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul class="current"> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent</span></code> – common functions</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.timeout.html">Cooperative Timeouts Using <code class="docutils literal notranslate"><span class="pre">gevent.Timeout</span></code></a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.greenlet.html">Greenlet Objects</a></li> <li class="toctree-l2 has-children"><a class="reference internal" href="../api/gevent.socket.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.socket</span></code> – Cooperative low-level networking interface</a><input class="toctree-checkbox" id="toctree-checkbox-4" name="toctree-checkbox-4" role="switch" type="checkbox"/><label for="toctree-checkbox-4"><div class="visually-hidden">Toggle navigation of gevent.socket – Cooperative low-level networking interface</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul> <li class="toctree-l3"><a class="reference internal" href="../api/gevent._socket3.html">Python 3 interface</a></li> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.ssl.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.ssl</span></code> – Secure Sockets Layer (SSL/TLS) module</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.select.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.select</span></code> – Waiting for I/O completion</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.selectors.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.selectors</span></code> – High-level IO Multiplexing</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.event.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.event</span></code> – Notifications of multiple listeners</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.queue.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.queue</span></code> – Synchronized queues</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.local.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.local</span></code> – Greenlet-local objects</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.lock.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.lock</span></code> – Locking primitives</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.hub.html"><code class="docutils literal notranslate"><span class="pre">gevent.hub</span></code> - The Event Loop and the Hub</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.core.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.core</span></code> - (deprecated) event loop abstraction</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent</span></code> – common functions</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.backdoor.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.backdoor</span></code> – Interactive greenlet-based network console that can be used in any process</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.baseserver.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.baseserver</span></code> – Base class for implementing servers</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.builtins.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.builtins</span></code> – gevent friendly implementations of builtin functions</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.contextvars.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.contextvars</span></code> – Cooperative <code class="docutils literal notranslate"><span class="pre">contextvars</span></code></a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.core.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.core</span></code> - (deprecated) event loop abstraction</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.event.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.event</span></code> – Notifications of multiple listeners</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.events.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.events</span></code> – Publish/subscribe event infrastructure</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.exceptions.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.exceptions</span></code> – Exceptions</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.fileobject.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.fileobject</span></code> – Wrappers to make file-like objects cooperative</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.hub.html"><code class="docutils literal notranslate"><span class="pre">gevent.hub</span></code> - The Event Loop and the Hub</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.local.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.local</span></code> – Greenlet-local objects</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.lock.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.lock</span></code> – Locking primitives</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.monkey.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.monkey</span></code> – Make the standard library cooperative</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.os.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.os</span></code> – Low-level operating system functions from <code class="xref py py-mod docutils literal notranslate"><span class="pre">os</span></code></a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.pool.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.pool</span></code> – Managing greenlets in a group</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.pywsgi.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.pywsgi</span></code> – A pure-Python, gevent-friendly WSGI server</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.queue.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.queue</span></code> – Synchronized queues</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.resolver.ares.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.ares</span></code> – c-ares based hostname resolver</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.resolver.blocking.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.blocking</span></code> – Non-cooperative resolver</a></li> <li class="toctree-l2"><a class="reference internal" href="../api/gevent.resolver.dnspython.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.dnspython</span></code> – Pure Python hostname resolver</a></li> <li class="toctree-l2"><a class="reference internal" 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2</span><span class="c1"># gevent-test-requires-resource: network</span> <span class="linenos"> 3</span><span class="sd">"""Resolve hostnames concurrently, exit after 2 seconds.</span> <span class="linenos"> 4</span> <span class="linenos"> 5</span><span class="sd">Under the hood, this might use an asynchronous resolver based on</span> <span class="linenos"> 6</span><span class="sd">c-ares (the default) or thread-pool-based resolver.</span> <span class="linenos"> 7</span> <span class="linenos"> 8</span><span class="sd">You can choose between resolvers using GEVENT_RESOLVER environment</span> <span class="linenos"> 9</span><span class="sd">variable. To enable threading resolver:</span> <span class="linenos">10</span> <span class="linenos">11</span><span class="sd"> GEVENT_RESOLVER=thread python dns_mass_resolve.py</span> <span class="linenos">12</span><span class="sd">"""</span> <span class="linenos">13</span><span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">print_function</span> <span class="linenos">14</span><span class="kn">import</span> <span class="nn">gevent</span> <span class="linenos">15</span><span class="kn">from</span> <span class="nn">gevent</span> <span class="kn">import</span> <span class="n">socket</span> <span class="linenos">16</span><span class="kn">from</span> <span class="nn">gevent.pool</span> <span class="kn">import</span> <span class="n">Pool</span> <span class="linenos">17</span> <span class="linenos">18</span><span class="n">N</span> <span class="o">=</span> <span class="mi">1000</span> <span class="linenos">19</span><span class="c1"># limit ourselves to max 10 simultaneous outstanding requests</span> <span class="linenos">20</span><span class="n">pool</span> <span class="o">=</span> <span class="n">Pool</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="linenos">21</span><span class="n">finished</span> <span class="o">=</span> <span class="mi">0</span> <span class="linenos">22</span> <span class="linenos">23</span> <span class="linenos">24</span><span class="k">def</span> <span class="nf">job</span><span class="p">(</span><span class="n">url</span><span class="p">):</span> <span class="linenos">25</span> <span class="k">global</span> <span class="n">finished</span> <span class="linenos">26</span> <span class="k">try</span><span class="p">:</span> <span class="linenos">27</span> <span class="k">try</span><span class="p">:</span> <span class="linenos">28</span> <span class="n">ip</span> <span class="o">=</span> <span class="n">socket</span><span class="o">.</span><span class="n">gethostbyname</span><span class="p">(</span><span class="n">url</span><span class="p">)</span> <span class="linenos">29</span> <span class="nb">print</span><span class="p">(</span><span class="s1">'</span><span class="si">%s</span><span class="s1"> = </span><span class="si">%s</span><span class="s1">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="n">ip</span><span class="p">))</span> <span class="linenos">30</span> <span class="k">except</span> <span class="n">socket</span><span class="o">.</span><span class="n">gaierror</span> <span class="k">as</span> <span class="n">ex</span><span class="p">:</span> <span class="linenos">31</span> <span class="nb">print</span><span class="p">(</span><span class="s1">'</span><span class="si">%s</span><span class="s1"> failed with </span><span class="si">%s</span><span class="s1">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="n">ex</span><span class="p">))</span> <span class="linenos">32</span> <span class="k">finally</span><span class="p">:</span> <span class="linenos">33</span> <span class="n">finished</span> <span class="o">+=</span> <span class="mi">1</span> <span class="linenos">34</span> <span class="linenos">35</span><span class="k">with</span> <span class="n">gevent</span><span class="o">.</span><span class="n">Timeout</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="kc">False</span><span class="p">):</span> <span class="linenos">36</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span> <span class="o">+</span> <span class="n">N</span><span class="p">):</span> <span class="linenos">37</span> <span class="n">pool</span><span class="o">.</span><span class="n">spawn</span><span class="p">(</span><span class="n">job</span><span class="p">,</span> <span class="s1">'</span><span class="si">%s</span><span class="s1">.com'</span> <span class="o">%</span> <span class="n">x</span><span class="p">)</span> <span class="linenos">38</span> <span class="n">pool</span><span class="o">.</span><span class="n">join</span><span class="p">()</span> <span class="linenos">39</span> <span class="linenos">40</span><span class="nb">print</span><span class="p">(</span><span class="s1">'finished within 2 seconds: </span><span class="si">%s</span><span class="s1">/</span><span class="si">%s</span><span class="s1">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">finished</span><span class="p">,</span> <span class="n">N</span><span class="p">))</span> </pre></div> </div> <p><a class="reference external" href="https://github.com/gevent/gevent/blob/master/examples/dns_mass_resolve.py">Current source</a></p> </section> </article> </div> 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