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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="attribute">
<dt id="celery.backends.base.BaseBackend.UnpickleableExecptionWrapper">
<tt class="descname">UnpickleableExecptionWrapper</tt><a class="headerlink" href="#celery.backends.base.BaseBackend.UnpickleableExecptionWrapper" title="Permalink to this definition">¶</a></dt>
<dd>alias of <a title="celery.backends.base.UnpickleableExceptionWrapper" class="reference internal" href="#celery.backends.base.UnpickleableExceptionWrapper"><tt class="xref docutils literal"><span class="pre">UnpickleableExceptionWrapper</span></tt></a></dd></dl>

<dl class="method">
<dt id="celery.backends.base.BaseBackend.cleanup">
<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.get_result">
<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="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="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="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="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="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_result">
<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="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="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">BaseExecption</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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