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  <div class="section" id="module-celery.backends.base">
<h1>Backend: Base - celery.backends.base<a class="headerlink" href="#module-celery.backends.base" title="Permalink to this headline">¶</a></h1>
<p>celery.backends.base</p>
<dl class="class">
<dt id="celery.backends.base.BaseBackend">
<em class="property">
class </em><tt class="descclassname">celery.backends.base.</tt><tt class="descname">BaseBackend</tt><a class="headerlink" href="#celery.backends.base.BaseBackend" title="Permalink to this definition">¶</a></dt>
<dd><p>The base backend class. All backends should inherit from this.</p>
<dl class="exception">
<dt id="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper">
<em class="property">
exception </em><tt class="descname">UnpickleableExceptionWrapper</tt><big>(</big><em>exc_module</em>, <em>exc_cls_name</em>, <em>exc_args</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps unpickleable exceptions.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><em>exc_module</em> &#8211; see <a title="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_module" class="reference internal" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_module"><tt class="xref docutils literal"><span class="pre">exc_module</span></tt></a>.</li>
<li><em>exc_cls_name</em> &#8211; see <a title="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_cls_name" class="reference internal" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_cls_name"><tt class="xref docutils literal"><span class="pre">exc_cls_name</span></tt></a>.</li>
<li><em>exc_args</em> &#8211; see <a title="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_args" class="reference internal" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_args"><tt class="xref docutils literal"><span class="pre">exc_args</span></tt></a></li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="attribute">
<dt id="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_module">
<tt class="descname">exc_module</tt><a class="headerlink" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_module" title="Permalink to this definition">¶</a></dt>
<dd>The module of the original exception.</dd></dl>

<dl class="attribute">
<dt id="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_cls_name">
<tt class="descname">exc_cls_name</tt><a class="headerlink" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_cls_name" title="Permalink to this definition">¶</a></dt>
<dd>The name of the original exception class.</dd></dl>

<dl class="attribute">
<dt id="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_args">
<tt class="descname">exc_args</tt><a class="headerlink" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_args" title="Permalink to this definition">¶</a></dt>
<dd>The arguments for the original exception.</dd></dl>

<p>Example</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">try</span><span class="p">:</span>
<span class="gp">... </span>    <span class="n">something_raising_unpickleable_exc</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">except</span> <span class="ne">Exception</span><span class="p">,</span> <span class="n">e</span><span class="p">:</span>
<span class="gp">... </span>    <span class="n">exc</span> <span class="o">=</span> <span class="n">UnpickleableException</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__module__</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="n">e</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__name__</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="n">e</span><span class="o">.</span><span class="n">args</span><span class="p">)</span>
<span class="gp">... </span>    <span class="n">pickle</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">exc</span><span class="p">)</span> <span class="c"># Works fine.</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.cleanup">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">cleanup</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.cleanup" title="Permalink to this definition">¶</a></dt>
<dd>Backend cleanup. Is run by
<a title="celery.task.DeleteExpiredTaskMetaTask" class="reference external" href="celery.task.html#celery.task.DeleteExpiredTaskMetaTask"><tt class="xref docutils literal"><span class="pre">celery.task.DeleteExpiredTaskMetaTask</span></tt></a>.</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.create_exception_cls">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">create_exception_cls</tt><big>(</big><em>name</em>, <em>module</em>, <em>parent=None</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.create_exception_cls" title="Permalink to this definition">¶</a></dt>
<dd>Dynamically create an exception class.</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.exception_to_python">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">exception_to_python</tt><big>(</big><em>exc</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.exception_to_python" title="Permalink to this definition">¶</a></dt>
<dd>Convert serialized exception to Python exception.</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.get_result">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">get_result</tt><big>(</big><em>task_id</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.get_result" title="Permalink to this definition">¶</a></dt>
<dd>Get the result of a task.</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.get_status">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">get_status</tt><big>(</big><em>task_id</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.get_status" title="Permalink to this definition">¶</a></dt>
<dd>Get the status of a task.</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.is_done">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">is_done</tt><big>(</big><em>task_id</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.is_done" title="Permalink to this definition">¶</a></dt>
<dd>Returns <tt class="xref docutils literal"><span class="pre">True</span></tt> if the task was successfully executed.</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.mark_as_done">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">mark_as_done</tt><big>(</big><em>task_id</em>, <em>result</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.mark_as_done" title="Permalink to this definition">¶</a></dt>
<dd>Mark task as successfully executed.</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.mark_as_failure">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">mark_as_failure</tt><big>(</big><em>task_id</em>, <em>exc</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.mark_as_failure" title="Permalink to this definition">¶</a></dt>
<dd>Mark task as executed with failure. Stores the execption.</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.mark_as_retry">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">mark_as_retry</tt><big>(</big><em>task_id</em>, <em>exc</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.mark_as_retry" title="Permalink to this definition">¶</a></dt>
<dd>Mark task for retry.</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.prepare_exception">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">prepare_exception</tt><big>(</big><em>exc</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.prepare_exception" title="Permalink to this definition">¶</a></dt>
<dd>Prepare exception for serialization.</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.prepare_result">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">prepare_result</tt><big>(</big><em>result</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.prepare_result" title="Permalink to this definition">¶</a></dt>
<dd>Prepare result for storage.</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.store_result">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">store_result</tt><big>(</big><em>task_id</em>, <em>result</em>, <em>status</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.store_result" title="Permalink to this definition">¶</a></dt>
<dd>Store the result and status of a task.</dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.wait_for">
<tt class="descclassname">BaseBackend.</tt><tt class="descname">wait_for</tt><big>(</big><em>task_id</em>, <em>timeout=None</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.wait_for" title="Permalink to this definition">¶</a></dt>
<dd><p>Wait for task and return its result.</p>
<p>If the task raises an exception, this exception
will be re-raised by <a title="celery.backends.base.BaseBackend.wait_for" class="reference internal" href="#celery.backends.base.BaseBackend.wait_for"><tt class="xref docutils literal"><span class="pre">wait_for()</span></tt></a>.</p>
<p>If <tt class="docutils literal"><span class="pre">timeout</span></tt> is not <tt class="xref docutils literal"><span class="pre">None</span></tt>, this raises the
<a title="celery.timer.TimeoutError" class="reference external" href="celery.timer.html#celery.timer.TimeoutError"><tt class="xref docutils literal"><span class="pre">celery.timer.TimeoutError</span></tt></a> exception if the operation takes
longer than <tt class="docutils literal"><span class="pre">timeout</span></tt> seconds.</p>
</dd></dl>

</dd></dl>

<dl class="exception">
<dt id="celery.backends.base.UnpickleableExceptionWrapper">
<em class="property">
exception </em><tt class="descclassname">celery.backends.base.</tt><tt class="descname">UnpickleableExceptionWrapper</tt><big>(</big><em>exc_module</em>, <em>exc_cls_name</em>, <em>exc_args</em><big>)</big><a class="headerlink" href="#celery.backends.base.UnpickleableExceptionWrapper" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps unpickleable exceptions.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><em>exc_module</em> &#8211; see <a title="celery.backends.base.UnpickleableExceptionWrapper.exc_module" class="reference internal" href="#celery.backends.base.UnpickleableExceptionWrapper.exc_module"><tt class="xref docutils literal"><span class="pre">exc_module</span></tt></a>.</li>
<li><em>exc_cls_name</em> &#8211; see <a title="celery.backends.base.UnpickleableExceptionWrapper.exc_cls_name" class="reference internal" href="#celery.backends.base.UnpickleableExceptionWrapper.exc_cls_name"><tt class="xref docutils literal"><span class="pre">exc_cls_name</span></tt></a>.</li>
<li><em>exc_args</em> &#8211; see <a title="celery.backends.base.UnpickleableExceptionWrapper.exc_args" class="reference internal" href="#celery.backends.base.UnpickleableExceptionWrapper.exc_args"><tt class="xref docutils literal"><span class="pre">exc_args</span></tt></a></li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="attribute">
<dt id="celery.backends.base.UnpickleableExceptionWrapper.exc_module">
<tt class="descname">exc_module</tt><a class="headerlink" href="#celery.backends.base.UnpickleableExceptionWrapper.exc_module" title="Permalink to this definition">¶</a></dt>
<dd>The module of the original exception.</dd></dl>

<dl class="attribute">
<dt id="celery.backends.base.UnpickleableExceptionWrapper.exc_cls_name">
<tt class="descname">exc_cls_name</tt><a class="headerlink" href="#celery.backends.base.UnpickleableExceptionWrapper.exc_cls_name" title="Permalink to this definition">¶</a></dt>
<dd>The name of the original exception class.</dd></dl>

<dl class="attribute">
<dt id="celery.backends.base.UnpickleableExceptionWrapper.exc_args">
<tt class="descname">exc_args</tt><a class="headerlink" href="#celery.backends.base.UnpickleableExceptionWrapper.exc_args" title="Permalink to this definition">¶</a></dt>
<dd>The arguments for the original exception.</dd></dl>

<p>Example</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">try</span><span class="p">:</span>
<span class="gp">... </span>    <span class="n">something_raising_unpickleable_exc</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">except</span> <span class="ne">Exception</span><span class="p">,</span> <span class="n">e</span><span class="p">:</span>
<span class="gp">... </span>    <span class="n">exc</span> <span class="o">=</span> <span class="n">UnpickleableException</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__module__</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="n">e</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__name__</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="n">e</span><span class="o">.</span><span class="n">args</span><span class="p">)</span>
<span class="gp">... </span>    <span class="n">pickle</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">exc</span><span class="p">)</span> <span class="c"># Works fine.</span>
</pre></div>
</div>
</dd></dl>

<dl class="function">
<dt id="celery.backends.base.find_nearest_pickleable_exception">
<tt class="descclassname">celery.backends.base.</tt><tt class="descname">find_nearest_pickleable_exception</tt><big>(</big><em>exc</em><big>)</big><a class="headerlink" href="#celery.backends.base.find_nearest_pickleable_exception" title="Permalink to this definition">¶</a></dt>
<dd><p>With an exception instance, iterate over its super classes (by mro)
and find the first super exception that is pickleable. It does
not go below <tt class="xref docutils literal"><span class="pre">Exception</span></tt> (i.e. it skips <tt class="xref docutils literal"><span class="pre">Exception</span></tt>,
<tt class="xref docutils literal"><span class="pre">BaseException</span></tt> and <tt class="xref docutils literal"><span class="pre">object</span></tt>). If that happens
you should use <tt class="xref docutils literal"><span class="pre">UnpickleableException</span></tt> instead.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Parameter:</th><td class="field-body"><em>exc</em> &#8211; An exception instance.</td>
</tr>
<tr class="field"><th class="field-name">Returns:</th><td class="field-body">the nearest exception if it&#8217;s not <tt class="xref docutils literal"><span class="pre">Exception</span></tt> or below,
if it is it returns <tt class="xref docutils literal"><span class="pre">None</span></tt>.</td>
</tr>
<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><tt class="xref docutils literal"><span class="pre">Exception</span></tt></td>
</tr>
</tbody>
</table>
</dd></dl>

</div>


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	  <h3>Contents</h3>
	  <ul class="current">
<li class="toctree-l1"><a class="reference external" href="../introduction.html">celery - Distributed Task Queue for Django.</a></li>
<li class="toctree-l1"><a class="reference external" href="../faq.html">Frequently Asked Questions</a></li>
<li class="toctree-l1 current"><a class="reference external" href="index.html">Module API Reference</a><ul class="current">
<li class="toctree-l2"><a class="reference external" href="celery.task.html">Tasks - celery.task</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.result.html">Task Result - celery.result</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.registry.html">Task Registry - celery.registry</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.discovery.html">Task Discovery - celery.discovery</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.worker.html">Multiprocessing Worker - celery.worker</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.backends.html">Backends - celery.backends</a></li>
<li class="toctree-l2 current"><a class="current reference external" href="">Backend: Base - celery.backends.base</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.backends.database.html">Backend: Database - celery.backends.database</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.backends.cache.html">Backend: Cache - celery.backends.cache</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.backends.tyrant.html">Backend: Tokyo Tyrant - celery.backends.tyrant</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.conf.html">Configuration - celery.conf</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.datastructures.html">Datastructures - celery.datastructures</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.log.html">Logging - celery.log</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.managers.html">Django Model Managers - celery.managers</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.models.html">Django Models - celery.models</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.messaging.html">Messaging - celery.messaging</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.platform.html">Platform Specific - celery.platform</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.timer.html">Timers - celery.timer</a></li>
<li class="toctree-l2"><a class="reference external" href="celery.bin.celeryd.html">Celery Worker Daemon - celery.bin.celeryd</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="../changelog.html">Change history</a></li>
</ul>

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