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  <div class="section" id="module-celery.worker">
<h1>Multiprocessing Worker - celery.worker<a class="headerlink" href="#module-celery.worker" title="Permalink to this headline">¶</a></h1>
<p>celery.worker</p>
<dl class="exception">
<dt id="celery.worker.EmptyQueue">
<em class="property">
exception </em><tt class="descclassname">celery.worker.</tt><tt class="descname">EmptyQueue</tt><a class="headerlink" href="#celery.worker.EmptyQueue" title="Permalink to this definition">¶</a></dt>
<dd>The message queue is currently empty.</dd></dl>

<dl class="class">
<dt id="celery.worker.TaskDaemon">
<em class="property">
class </em><tt class="descclassname">celery.worker.</tt><tt class="descname">TaskDaemon</tt><big>(</big><em>concurrency=None</em>, <em>logfile=None</em>, <em>loglevel=None</em>, <em>queue_wakeup_after=None</em><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon" title="Permalink to this definition">¶</a></dt>
<dd><p>Executes tasks waiting in the task queue.</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>concurrency</em> &#8211; see <a title="celery.worker.TaskDaemon.concurrency" class="reference internal" href="#celery.worker.TaskDaemon.concurrency"><tt class="xref docutils literal"><span class="pre">concurrency</span></tt></a>.</li>
<li><em>logfile</em> &#8211; see <a title="celery.worker.TaskDaemon.logfile" class="reference internal" href="#celery.worker.TaskDaemon.logfile"><tt class="xref docutils literal"><span class="pre">logfile</span></tt></a>.</li>
<li><em>loglevel</em> &#8211; see <a title="celery.worker.TaskDaemon.loglevel" class="reference internal" href="#celery.worker.TaskDaemon.loglevel"><tt class="xref docutils literal"><span class="pre">loglevel</span></tt></a>.</li>
<li><em>queue_wakeup_after</em> &#8211; see <a title="celery.worker.TaskDaemon.queue_wakeup_after" class="reference internal" href="#celery.worker.TaskDaemon.queue_wakeup_after"><tt class="xref docutils literal"><span class="pre">queue_wakeup_after</span></tt></a>.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="attribute">
<dt id="celery.worker.TaskDaemon.concurrency">
<tt class="descname">concurrency</tt><a class="headerlink" href="#celery.worker.TaskDaemon.concurrency" title="Permalink to this definition">¶</a></dt>
<dd>The number of simultaneous processes doing work (default:
<a title="celery.conf.DAEMON_CONCURRENCY" class="reference external" href="celery.conf.html#celery.conf.DAEMON_CONCURRENCY"><tt class="xref docutils literal"><span class="pre">celery.conf.DAEMON_CONCURRENCY</span></tt></a>)</dd></dl>

<dl class="attribute">
<dt id="celery.worker.TaskDaemon.loglevel">
<tt class="descname">loglevel</tt><a class="headerlink" href="#celery.worker.TaskDaemon.loglevel" title="Permalink to this definition">¶</a></dt>
<dd>The loglevel used (default: <tt class="xref docutils literal"><span class="pre">logging.INFO</span></tt>)</dd></dl>

<dl class="attribute">
<dt id="celery.worker.TaskDaemon.logfile">
<tt class="descname">logfile</tt><a class="headerlink" href="#celery.worker.TaskDaemon.logfile" title="Permalink to this definition">¶</a></dt>
<dd>The logfile used, if no logfile is specified it uses <tt class="docutils literal"><span class="pre">stderr</span></tt>
(default: <a title="celery.conf.DAEMON_LOG_FILE" class="reference external" href="celery.conf.html#celery.conf.DAEMON_LOG_FILE"><tt class="xref docutils literal"><span class="pre">celery.conf.DAEMON_LOG_FILE</span></tt></a>).</dd></dl>

<dl class="attribute">
<dt id="celery.worker.TaskDaemon.queue_wakeup_after">
<tt class="descname">queue_wakeup_after</tt><a class="headerlink" href="#celery.worker.TaskDaemon.queue_wakeup_after" title="Permalink to this definition">¶</a></dt>
<dd>The time it takes for the daemon to wake up after the queue is empty,
so it can check for more work
(default: <a title="celery.conf.QUEUE_WAKEUP_AFTER" class="reference external" href="celery.conf.html#celery.conf.QUEUE_WAKEUP_AFTER"><tt class="xref docutils literal"><span class="pre">celery.conf.QUEUE_WAKEUP_AFTER</span></tt></a>).</dd></dl>

<dl class="attribute">
<dt id="celery.worker.TaskDaemon.empty_msg_emit_every">
<tt class="descname">empty_msg_emit_every</tt><a class="headerlink" href="#celery.worker.TaskDaemon.empty_msg_emit_every" title="Permalink to this definition">¶</a></dt>
<dd>How often the daemon emits the <tt class="docutils literal"><span class="pre">&quot;Waiting</span> <span class="pre">for</span> <span class="pre">queue...&quot;</span></tt> message.
If this is <tt class="xref docutils literal"><span class="pre">None</span></tt>, the message will never be logged.
(default: <a title="celery.conf.EMPTY_MSG_EMIT_EVERY" class="reference external" href="celery.conf.html#celery.conf.EMPTY_MSG_EMIT_EVERY"><tt class="xref docutils literal"><span class="pre">celery.conf.EMPTY_MSG_EMIT_EVERY</span></tt></a>)</dd></dl>

<dl class="attribute">
<dt id="celery.worker.TaskDaemon.logger">
<tt class="descname">logger</tt><a class="headerlink" href="#celery.worker.TaskDaemon.logger" title="Permalink to this definition">¶</a></dt>
<dd>The <tt class="xref docutils literal"><span class="pre">logging.Logger</span></tt> instance used for logging.</dd></dl>

<dl class="attribute">
<dt id="celery.worker.TaskDaemon.pool">
<tt class="descname">pool</tt><a class="headerlink" href="#celery.worker.TaskDaemon.pool" title="Permalink to this definition">¶</a></dt>
<dd>The <tt class="xref docutils literal"><span class="pre">multiprocessing.Pool</span></tt> instance used.</dd></dl>

<dl class="attribute">
<dt id="celery.worker.TaskDaemon.task_consumer">
<tt class="descname">task_consumer</tt><a class="headerlink" href="#celery.worker.TaskDaemon.task_consumer" title="Permalink to this definition">¶</a></dt>
<dd>The <a title="celery.messaging.TaskConsumer" class="reference external" href="celery.messaging.html#celery.messaging.TaskConsumer"><tt class="xref docutils literal"><span class="pre">celery.messaging.TaskConsumer</span></tt></a> instance used.</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskDaemon.connection_diagnostics">
<tt class="descname">connection_diagnostics</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.connection_diagnostics" title="Permalink to this definition">¶</a></dt>
<dd>Diagnose the AMQP connection, and reset connection if
necessary.</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskDaemon.execute_next_task">
<tt class="descname">execute_next_task</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.execute_next_task" title="Permalink to this definition">¶</a></dt>
<dd><p>Execute the next task on the queue using the multiprocessing pool.</p>
<p>Catches all exceptions and logs them with level
<tt class="xref docutils literal"><span class="pre">logging.CRITICAL</span></tt>.</p>
</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskDaemon.fetch_next_task">
<tt class="descname">fetch_next_task</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.fetch_next_task" title="Permalink to this definition">¶</a></dt>
<dd><p>Fetch the next task from the AMQP broker.</p>
<p>Raises <a title="celery.worker.EmptyQueue" class="reference internal" href="#celery.worker.EmptyQueue"><tt class="xref docutils literal"><span class="pre">EmptyQueue</span></tt></a> exception if there is no message
waiting on the queue.</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">Returns:</th><td class="field-body"><a title="celery.worker.TaskWrapper" class="reference internal" href="#celery.worker.TaskWrapper"><tt class="xref docutils literal"><span class="pre">TaskWrapper</span></tt></a> instance.</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskDaemon.receive_message">
<tt class="descname">receive_message</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.receive_message" title="Permalink to this definition">¶</a></dt>
<dd><p>Receive the next message from the message broker.</p>
<p>Tries to reset the AMQP connection if not available.
Returns <tt class="xref docutils literal"><span class="pre">None</span></tt> if no message is waiting on the queue.</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">Return type:</th><td class="field-body"><tt class="xref docutils literal"><span class="pre">carrot.messaging.Message</span></tt> instance.</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskDaemon.reset_connection">
<tt class="descname">reset_connection</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.reset_connection" title="Permalink to this definition">¶</a></dt>
<dd><p>Reset the AMQP connection, and reinitialize the
<a title="celery.messaging.TaskConsumer" class="reference external" href="celery.messaging.html#celery.messaging.TaskConsumer"><tt class="xref docutils literal"><span class="pre">celery.messaging.TaskConsumer</span></tt></a> instance.</p>
<p>Resets the task consumer in <a title="celery.worker.TaskDaemon.task_consumer" class="reference internal" href="#celery.worker.TaskDaemon.task_consumer"><tt class="xref docutils literal"><span class="pre">task_consumer</span></tt></a>.</p>
</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskDaemon.run">
<tt class="descname">run</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.run" title="Permalink to this definition">¶</a></dt>
<dd>Starts the workers main loop.</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskDaemon.run_periodic_tasks">
<tt class="descname">run_periodic_tasks</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.run_periodic_tasks" title="Permalink to this definition">¶</a></dt>
<dd><p>Schedule all waiting periodic tasks for execution.</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">Return type:</th><td class="field-body">list of <tt class="xref docutils literal"><span class="pre">celery.models.PeriodicTaskMeta</span></tt> objects.</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskDaemon.schedule_retry_tasks">
<tt class="descname">schedule_retry_tasks</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.schedule_retry_tasks" title="Permalink to this definition">¶</a></dt>
<dd>Reschedule all requeued tasks waiting for retry.</dd></dl>

</dd></dl>

<dl class="class">
<dt id="celery.worker.TaskWrapper">
<em class="property">
class </em><tt class="descclassname">celery.worker.</tt><tt class="descname">TaskWrapper</tt><big>(</big><em>task_name</em>, <em>task_id</em>, <em>task_func</em>, <em>args</em>, <em>kwargs</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper" title="Permalink to this definition">¶</a></dt>
<dd><p>Class wrapping a task to be run.</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>task_name</em> &#8211; see <a title="celery.worker.TaskWrapper.task_name" class="reference internal" href="#celery.worker.TaskWrapper.task_name"><tt class="xref docutils literal"><span class="pre">task_name</span></tt></a>.</li>
<li><em>task_id</em> &#8211; see <a title="celery.worker.TaskWrapper.task_id" class="reference internal" href="#celery.worker.TaskWrapper.task_id"><tt class="xref docutils literal"><span class="pre">task_id</span></tt></a>.</li>
<li><em>task_func</em> &#8211; see <a title="celery.worker.TaskWrapper.task_func" class="reference internal" href="#celery.worker.TaskWrapper.task_func"><tt class="xref docutils literal"><span class="pre">task_func</span></tt></a></li>
<li><em>args</em> &#8211; see <a title="celery.worker.TaskWrapper.args" class="reference internal" href="#celery.worker.TaskWrapper.args"><tt class="xref docutils literal"><span class="pre">args</span></tt></a></li>
<li><em>kwargs</em> &#8211; see <a title="celery.worker.TaskWrapper.kwargs" class="reference internal" href="#celery.worker.TaskWrapper.kwargs"><tt class="xref docutils literal"><span class="pre">kwargs</span></tt></a>.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="attribute">
<dt id="celery.worker.TaskWrapper.task_name">
<tt class="descname">task_name</tt><a class="headerlink" href="#celery.worker.TaskWrapper.task_name" title="Permalink to this definition">¶</a></dt>
<dd>Kind of task. Must be a name registered in the task registry.</dd></dl>

<dl class="attribute">
<dt id="celery.worker.TaskWrapper.task_id">
<tt class="descname">task_id</tt><a class="headerlink" href="#celery.worker.TaskWrapper.task_id" title="Permalink to this definition">¶</a></dt>
<dd>UUID of the task.</dd></dl>

<dl class="attribute">
<dt id="celery.worker.TaskWrapper.task_func">
<tt class="descname">task_func</tt><a class="headerlink" href="#celery.worker.TaskWrapper.task_func" title="Permalink to this definition">¶</a></dt>
<dd>The tasks callable object.</dd></dl>

<dl class="attribute">
<dt id="celery.worker.TaskWrapper.args">
<tt class="descname">args</tt><a class="headerlink" href="#celery.worker.TaskWrapper.args" title="Permalink to this definition">¶</a></dt>
<dd>List of positional arguments to apply to the task.</dd></dl>

<dl class="attribute">
<dt id="celery.worker.TaskWrapper.kwargs">
<tt class="descname">kwargs</tt><a class="headerlink" href="#celery.worker.TaskWrapper.kwargs" title="Permalink to this definition">¶</a></dt>
<dd>Mapping of keyword arguments to apply to the task.</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskWrapper.execute">
<tt class="descname">execute</tt><big>(</big><em>loglevel=None</em>, <em>logfile=None</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.execute" title="Permalink to this definition">¶</a></dt>
<dd><p>Execute the task in a <a title="celery.worker.jail" class="reference internal" href="#celery.worker.jail"><tt class="xref docutils literal"><span class="pre">jail()</span></tt></a> and store return value
and status in the task meta backend.</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>loglevel</em> &#8211; The loglevel used by the task.</li>
<li><em>logfile</em> &#8211; The logfile used by the task.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskWrapper.execute_using_pool">
<tt class="descname">execute_using_pool</tt><big>(</big><em>pool</em>, <em>loglevel=None</em>, <em>logfile=None</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.execute_using_pool" title="Permalink to this definition">¶</a></dt>
<dd><p>Like <a title="celery.worker.TaskWrapper.execute" class="reference internal" href="#celery.worker.TaskWrapper.execute"><tt class="xref docutils literal"><span class="pre">execute()</span></tt></a>, but using the <tt class="xref docutils literal"><span class="pre">multiprocessing</span></tt> pool.</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>pool</em> &#8211; A <a href="#id1"><span class="problematic" id="id2">:cls:`multiprocessing.Pool`</span></a> instance.</li>
<li><em>loglevel</em> &#8211; The loglevel used by the task.</li>
<li><em>logfile</em> &#8211; The logfile used by the task.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>:returns <tt class="xref docutils literal"><span class="pre">multiprocessing.AsyncResult</span></tt> instance.</p>
</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskWrapper.extend_with_default_kwargs">
<tt class="descname">extend_with_default_kwargs</tt><big>(</big><em>loglevel</em>, <em>logfile</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.extend_with_default_kwargs" title="Permalink to this definition">¶</a></dt>
<dd><p>Extend the tasks keyword arguments with standard task arguments.</p>
<p>These are <tt class="docutils literal"><span class="pre">logfile</span></tt>, <tt class="docutils literal"><span class="pre">loglevel</span></tt>, <tt class="docutils literal"><span class="pre">task_id</span></tt> and <tt class="docutils literal"><span class="pre">task_name</span></tt>.</p>
</dd></dl>

<dl class="classmethod">
<dt id="celery.worker.TaskWrapper.from_message">
<em class="property">
classmethod </em><tt class="descname">from_message</tt><big>(</big><em>message</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.from_message" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a <a title="celery.worker.TaskWrapper" class="reference internal" href="#celery.worker.TaskWrapper"><tt class="xref docutils literal"><span class="pre">TaskWrapper</span></tt></a> from a task message sent by
<a title="celery.messaging.TaskPublisher" class="reference external" href="celery.messaging.html#celery.messaging.TaskPublisher"><tt class="xref docutils literal"><span class="pre">celery.messaging.TaskPublisher</span></tt></a>.</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" colspan="2">Raises <a title="celery.worker.UnknownTask" class="reference internal" href="#celery.worker.UnknownTask">UnknownTask</a>:</th></tr>
<tr><td>&nbsp;</td><td class="field-body">if the message does not describe a task,
the message is also rejected.</td>
</tr>
<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><a title="celery.worker.TaskWrapper" class="reference internal" href="#celery.worker.TaskWrapper"><tt class="xref docutils literal"><span class="pre">TaskWrapper</span></tt></a> instance.</td>
</tr>
</tbody>
</table>
</dd></dl>

</dd></dl>

<dl class="exception">
<dt id="celery.worker.UnknownTask">
<em class="property">
exception </em><tt class="descclassname">celery.worker.</tt><tt class="descname">UnknownTask</tt><a class="headerlink" href="#celery.worker.UnknownTask" title="Permalink to this definition">¶</a></dt>
<dd>Got an unknown task in the queue. The message is requeued and
ignored.</dd></dl>

<dl class="function">
<dt id="celery.worker.jail">
<tt class="descclassname">celery.worker.</tt><tt class="descname">jail</tt><big>(</big><em>task_id</em>, <em>func</em>, <em>args</em>, <em>kwargs</em><big>)</big><a class="headerlink" href="#celery.worker.jail" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps the task in a jail, which catches all exceptions, and 
saves the status and result of the task execution to the task
meta backend.</p>
<p>If the call was successful, it saves the result to the task result
backend, and sets the task status to <tt class="docutils literal"><span class="pre">&quot;DONE&quot;</span></tt>.</p>
<p>If the call results in an exception, it saves the exception as the task
result, and sets the task status to <tt class="docutils literal"><span class="pre">&quot;FAILURE&quot;</span></tt>.</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 simple">
<li><em>task_id</em> &#8211; The id of the task.</li>
<li><em>func</em> &#8211; Callable object to execute.</li>
<li><em>args</em> &#8211; List of positional args to pass on to the function.</li>
<li><em>kwargs</em> &#8211; Keyword arguments mapping to pass on to the function.</li>
</ul>
</td>
</tr>
<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">the function return value on success.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">the exception instance on failure.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>

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