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<span class="target" id="module-kombu.messaging"></span><div class="section" id="kombu-messaging">
<h1>kombu.messaging<a class="headerlink" href="#kombu-messaging" title="Permalink to this headline">¶</a></h1>
<p>Sending and receiving messages.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">copyright:</th><td class="field-body"><ol class="first loweralpha simple" start="3">
<li>2009 - 2012 by Ask Solem.</li>
</ol>
</td>
</tr>
<tr class="field-even field"><th class="field-name">license:</th><td class="field-body"><p class="first last">BSD, see LICENSE for more details.</p>
</td>
</tr>
</tbody>
</table>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#message-producer" id="id1">Message Producer</a></li>
<li><a class="reference internal" href="#message-consumer" id="id2">Message Consumer</a></li>
</ul>
</div>
<div class="section" id="message-producer">
<h2><a class="toc-backref" href="#id1">Message Producer</a><a class="headerlink" href="#message-producer" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="kombu.messaging.Producer">
<em class="property">class </em><tt class="descclassname">kombu.messaging.</tt><tt class="descname">Producer</tt><big>(</big><em>channel</em>, <em>exchange=None</em>, <em>routing_key=None</em>, <em>serializer=None</em>, <em>auto_declare=None</em>, <em>compression=None</em>, <em>on_return=None</em><big>)</big><a class="headerlink" href="#kombu.messaging.Producer" title="Permalink to this definition">¶</a></dt>
<dd><p>Message Producer.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>channel</strong> – Connection or channel.</li>
<li><strong>exchange</strong> – Optional default exchange.</li>
<li><strong>routing_key</strong> – Optional default routing key.</li>
<li><strong>serializer</strong> – Default serializer. Default is <cite>“json”</cite>.</li>
<li><strong>compression</strong> – Default compression method. Default is no
compression.</li>
<li><strong>auto_declare</strong> – Automatically declare the default exchange
at instantiation. Default is <tt class="xref py py-const docutils literal"><span class="pre">True</span></tt>.</li>
<li><strong>on_return</strong> – Callback to call for undeliverable messages,
when the <cite>mandatory</cite> or <cite>immediate</cite> arguments to
<a class="reference internal" href="#kombu.messaging.Producer.publish" title="kombu.messaging.Producer.publish"><tt class="xref py py-meth docutils literal"><span class="pre">publish()</span></tt></a> is used. This callback needs the following
signature: <cite>(exception, exchange, routing_key, message)</cite>.
Note that the producer needs to drain events to use this feature.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="attribute">
<dt id="kombu.messaging.Producer.channel">
<tt class="descname">channel</tt><em class="property"> = None</em><a class="headerlink" href="#kombu.messaging.Producer.channel" title="Permalink to this definition">¶</a></dt>
<dd><p>The connection channel used.</p>
</dd></dl>
<dl class="attribute">
<dt id="kombu.messaging.Producer.exchange">
<tt class="descname">exchange</tt><em class="property"> = None</em><a class="headerlink" href="#kombu.messaging.Producer.exchange" title="Permalink to this definition">¶</a></dt>
<dd><p>Default exchange.</p>
</dd></dl>
<dl class="attribute">
<dt id="kombu.messaging.Producer.routing_key">
<tt class="descname">routing_key</tt><em class="property"> = ''</em><a class="headerlink" href="#kombu.messaging.Producer.routing_key" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="attribute">
<dt id="kombu.messaging.Producer.serializer">
<tt class="descname">serializer</tt><em class="property"> = None</em><a class="headerlink" href="#kombu.messaging.Producer.serializer" title="Permalink to this definition">¶</a></dt>
<dd><p>Default serializer to use. Default is JSON.</p>
</dd></dl>
<dl class="attribute">
<dt id="kombu.messaging.Producer.compression">
<tt class="descname">compression</tt><em class="property"> = None</em><a class="headerlink" href="#kombu.messaging.Producer.compression" title="Permalink to this definition">¶</a></dt>
<dd><p>Default compression method. Disabled by default.</p>
</dd></dl>
<dl class="attribute">
<dt id="kombu.messaging.Producer.auto_declare">
<tt class="descname">auto_declare</tt><em class="property"> = True</em><a class="headerlink" href="#kombu.messaging.Producer.auto_declare" title="Permalink to this definition">¶</a></dt>
<dd><p>By default the exchange is declared at instantiation.
If you want to declare manually then you can set this
to <tt class="xref py py-const docutils literal"><span class="pre">False</span></tt>.</p>
</dd></dl>
<dl class="attribute">
<dt id="kombu.messaging.Producer.on_return">
<tt class="descname">on_return</tt><em class="property"> = None</em><a class="headerlink" href="#kombu.messaging.Producer.on_return" title="Permalink to this definition">¶</a></dt>
<dd><p>Basic return callback.</p>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Producer.declare">
<tt class="descname">declare</tt><big>(</big><big>)</big><a class="headerlink" href="#kombu.messaging.Producer.declare" title="Permalink to this definition">¶</a></dt>
<dd><p>Declare the exchange.</p>
<p>This happens automatically at instantiation if
<a class="reference internal" href="#kombu.messaging.Producer.auto_declare" title="kombu.messaging.Producer.auto_declare"><tt class="xref py py-attr docutils literal"><span class="pre">auto_declare</span></tt></a> is enabled.</p>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Producer.publish">
<tt class="descname">publish</tt><big>(</big><em>body</em>, <em>routing_key=None</em>, <em>delivery_mode=None</em>, <em>mandatory=False</em>, <em>immediate=False</em>, <em>priority=0</em>, <em>content_type=None</em>, <em>content_encoding=None</em>, <em>serializer=None</em>, <em>headers=None</em>, <em>compression=None</em>, <em>exchange=None</em>, <em>retry=False</em>, <em>retry_policy=None</em>, <em>declare=</em><span class="optional">[</span><span class="optional">]</span>, <em>**properties</em><big>)</big><a class="headerlink" href="#kombu.messaging.Producer.publish" title="Permalink to this definition">¶</a></dt>
<dd><p>Publish message to the specified exchange.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>body</strong> – Message body.</li>
<li><strong>routing_key</strong> – Message routing key.</li>
<li><strong>delivery_mode</strong> – See <tt class="xref py py-attr docutils literal"><span class="pre">delivery_mode</span></tt>.</li>
<li><strong>mandatory</strong> – Currently not supported.</li>
<li><strong>immediate</strong> – Currently not supported.</li>
<li><strong>priority</strong> – Message priority. A number between 0 and 9.</li>
<li><strong>content_type</strong> – Content type. Default is auto-detect.</li>
<li><strong>content_encoding</strong> – Content encoding. Default is auto-detect.</li>
<li><strong>serializer</strong> – Serializer to use. Default is auto-detect.</li>
<li><strong>compression</strong> – Compression method to use. Default is none.</li>
<li><strong>headers</strong> – Mapping of arbitrary headers to pass along
with the message body.</li>
<li><strong>exchange</strong> – Override the exchange. Note that this exchange
must have been declared.</li>
<li><strong>declare</strong> – Optional list of required entities that must
have been declared before publishing the message. The entities
will be declared using <a class="reference internal" href="kombu.common.html#kombu.common.maybe_declare" title="kombu.common.maybe_declare"><tt class="xref py py-func docutils literal"><span class="pre">maybe_declare()</span></tt></a>.</li>
<li><strong>retry</strong> – Retry publishing, or declaring entities if the
connection is lost.</li>
<li><strong>retry_policy</strong> – Retry configuration, this is the keywords
supported by <tt class="xref py py-meth docutils literal"><span class="pre">ensure()</span></tt>.</li>
<li><strong>**properties</strong> – Additional message properties, see AMQP spec.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Producer.revive">
<tt class="descname">revive</tt><big>(</big><em>channel</em><big>)</big><a class="headerlink" href="#kombu.messaging.Producer.revive" title="Permalink to this definition">¶</a></dt>
<dd><p>Revive the producer after connection loss.</p>
</dd></dl>
</dd></dl>
</div>
<div class="section" id="message-consumer">
<h2><a class="toc-backref" href="#id2">Message Consumer</a><a class="headerlink" href="#message-consumer" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="kombu.messaging.Consumer">
<em class="property">class </em><tt class="descclassname">kombu.messaging.</tt><tt class="descname">Consumer</tt><big>(</big><em>channel</em>, <em>queues=None</em>, <em>no_ack=None</em>, <em>auto_declare=None</em>, <em>callbacks=None</em>, <em>on_decode_error=None</em><big>)</big><a class="headerlink" href="#kombu.messaging.Consumer" title="Permalink to this definition">¶</a></dt>
<dd><p>Message consumer.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>channel</strong> – see <a class="reference internal" href="#kombu.messaging.Consumer.channel" title="kombu.messaging.Consumer.channel"><tt class="xref py py-attr docutils literal"><span class="pre">channel</span></tt></a>.</li>
<li><strong>queues</strong> – see <a class="reference internal" href="#kombu.messaging.Consumer.queues" title="kombu.messaging.Consumer.queues"><tt class="xref py py-attr docutils literal"><span class="pre">queues</span></tt></a>.</li>
<li><strong>no_ack</strong> – see <a class="reference internal" href="#kombu.messaging.Consumer.no_ack" title="kombu.messaging.Consumer.no_ack"><tt class="xref py py-attr docutils literal"><span class="pre">no_ack</span></tt></a>.</li>
<li><strong>auto_declare</strong> – see <a class="reference internal" href="#kombu.messaging.Consumer.auto_declare" title="kombu.messaging.Consumer.auto_declare"><tt class="xref py py-attr docutils literal"><span class="pre">auto_declare</span></tt></a></li>
<li><strong>callbacks</strong> – see <a class="reference internal" href="#kombu.messaging.Consumer.callbacks" title="kombu.messaging.Consumer.callbacks"><tt class="xref py py-attr docutils literal"><span class="pre">callbacks</span></tt></a>.</li>
<li><strong>on_decode_error</strong> – see <a class="reference internal" href="#kombu.messaging.Consumer.on_decode_error" title="kombu.messaging.Consumer.on_decode_error"><tt class="xref py py-attr docutils literal"><span class="pre">on_decode_error</span></tt></a>.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="attribute">
<dt id="kombu.messaging.Consumer.channel">
<tt class="descname">channel</tt><em class="property"> = None</em><a class="headerlink" href="#kombu.messaging.Consumer.channel" title="Permalink to this definition">¶</a></dt>
<dd><p>The connection/channel to use for this consumer.</p>
</dd></dl>
<dl class="attribute">
<dt id="kombu.messaging.Consumer.queues">
<tt class="descname">queues</tt><em class="property"> = None</em><a class="headerlink" href="#kombu.messaging.Consumer.queues" title="Permalink to this definition">¶</a></dt>
<dd><p>A single <a class="reference internal" href="kombu.entity.html#kombu.entity.Queue" title="kombu.entity.Queue"><tt class="xref py py-class docutils literal"><span class="pre">Queue</span></tt></a>, or a list of queues to
consume from.</p>
</dd></dl>
<dl class="attribute">
<dt id="kombu.messaging.Consumer.no_ack">
<tt class="descname">no_ack</tt><em class="property"> = None</em><a class="headerlink" href="#kombu.messaging.Consumer.no_ack" title="Permalink to this definition">¶</a></dt>
<dd><p>Flag for message acknowledgment disabled/enabled.
Enabled by default.</p>
</dd></dl>
<dl class="attribute">
<dt id="kombu.messaging.Consumer.auto_declare">
<tt class="descname">auto_declare</tt><em class="property"> = True</em><a class="headerlink" href="#kombu.messaging.Consumer.auto_declare" title="Permalink to this definition">¶</a></dt>
<dd><p>By default all entities will be declared at instantiation, if you
want to handle this manually you can set this to <tt class="xref py py-const docutils literal"><span class="pre">False</span></tt>.</p>
</dd></dl>
<dl class="attribute">
<dt id="kombu.messaging.Consumer.callbacks">
<tt class="descname">callbacks</tt><em class="property"> = None</em><a class="headerlink" href="#kombu.messaging.Consumer.callbacks" title="Permalink to this definition">¶</a></dt>
<dd><p>List of callbacks called in order when a message is received.</p>
<p>The signature of the callbacks must take two arguments:
<cite>(body, message)</cite>, which is the decoded message body and
the <cite>Message</cite> instance (a subclass of
<a class="reference internal" href="kombu.transport.base.html#kombu.transport.base.Message" title="kombu.transport.base.Message"><tt class="xref py py-class docutils literal"><span class="pre">Message</span></tt></a>).</p>
</dd></dl>
<dl class="attribute">
<dt id="kombu.messaging.Consumer.on_decode_error">
<tt class="descname">on_decode_error</tt><em class="property"> = None</em><a class="headerlink" href="#kombu.messaging.Consumer.on_decode_error" title="Permalink to this definition">¶</a></dt>
<dd><p>Callback called when a message can’t be decoded.</p>
<p>The signature of the callback must take two arguments: <cite>(message,
exc)</cite>, which is the message that can’t be decoded and the exception
that occurred while trying to decode it.</p>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Consumer.declare">
<tt class="descname">declare</tt><big>(</big><big>)</big><a class="headerlink" href="#kombu.messaging.Consumer.declare" title="Permalink to this definition">¶</a></dt>
<dd><p>Declare queues, exchanges and bindings.</p>
<p>This is done automatically at instantiation if <a class="reference internal" href="#kombu.messaging.Consumer.auto_declare" title="kombu.messaging.Consumer.auto_declare"><tt class="xref py py-attr docutils literal"><span class="pre">auto_declare</span></tt></a>
is set.</p>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Consumer.register_callback">
<tt class="descname">register_callback</tt><big>(</big><em>callback</em><big>)</big><a class="headerlink" href="#kombu.messaging.Consumer.register_callback" title="Permalink to this definition">¶</a></dt>
<dd><p>Register a new callback to be called when a message
is received.</p>
<p>The signature of the callback needs to accept two arguments:
<cite>(body, message)</cite>, which is the decoded message body
and the <cite>Message</cite> instance (a subclass of
<a class="reference internal" href="kombu.transport.base.html#kombu.transport.base.Message" title="kombu.transport.base.Message"><tt class="xref py py-class docutils literal"><span class="pre">Message</span></tt></a>.</p>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Consumer.consume">
<tt class="descname">consume</tt><big>(</big><em>no_ack=None</em><big>)</big><a class="headerlink" href="#kombu.messaging.Consumer.consume" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="kombu.messaging.Consumer.cancel">
<tt class="descname">cancel</tt><big>(</big><big>)</big><a class="headerlink" href="#kombu.messaging.Consumer.cancel" title="Permalink to this definition">¶</a></dt>
<dd><p>End all active queue consumers.</p>
<p>This does not affect already delivered messages, but it does
mean the server will not send any more messages for this consumer.</p>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Consumer.cancel_by_queue">
<tt class="descname">cancel_by_queue</tt><big>(</big><em>queue</em><big>)</big><a class="headerlink" href="#kombu.messaging.Consumer.cancel_by_queue" title="Permalink to this definition">¶</a></dt>
<dd><p>Cancel consumer by queue name.</p>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Consumer.purge">
<tt class="descname">purge</tt><big>(</big><big>)</big><a class="headerlink" href="#kombu.messaging.Consumer.purge" title="Permalink to this definition">¶</a></dt>
<dd><p>Purge messages from all queues.</p>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">This will <em>delete all ready messages</em>, there is no
undo operation.</p>
</div>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Consumer.flow">
<tt class="descname">flow</tt><big>(</big><em>active</em><big>)</big><a class="headerlink" href="#kombu.messaging.Consumer.flow" title="Permalink to this definition">¶</a></dt>
<dd><p>Enable/disable flow from peer.</p>
<p>This is a simple flow-control mechanism that a peer can use
to avoid overflowing its queues or otherwise finding itself
receiving more messages than it can process.</p>
<p>The peer that receives a request to stop sending content
will finish sending the current content (if any), and then wait
until flow is reactivated.</p>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Consumer.qos">
<tt class="descname">qos</tt><big>(</big><em>prefetch_size=0</em>, <em>prefetch_count=0</em>, <em>apply_global=False</em><big>)</big><a class="headerlink" href="#kombu.messaging.Consumer.qos" title="Permalink to this definition">¶</a></dt>
<dd><p>Specify quality of service.</p>
<p>The client can request that messages should be sent in
advance so that when the client finishes processing a message,
the following message is already held locally, rather than needing
to be sent down the channel. Prefetching gives a performance
improvement.</p>
<p>The prefetch window is Ignored if the <a class="reference internal" href="#kombu.messaging.Consumer.no_ack" title="kombu.messaging.Consumer.no_ack"><tt class="xref py py-attr docutils literal"><span class="pre">no_ack</span></tt></a> option is set.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>prefetch_size</strong> – Specify the prefetch window in octets.
The server will send a message in advance if it is equal to
or smaller in size than the available prefetch size (and
also falls within other prefetch limits). May be set to zero,
meaning “no specific limit”, although other prefetch limits
may still apply.</li>
<li><strong>prefetch_count</strong> – Specify the prefetch window in terms of
whole messages.</li>
<li><strong>apply_global</strong> – Apply new settings globally on all channels.
Currently not supported by RabbitMQ.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Consumer.recover">
<tt class="descname">recover</tt><big>(</big><em>requeue=False</em><big>)</big><a class="headerlink" href="#kombu.messaging.Consumer.recover" title="Permalink to this definition">¶</a></dt>
<dd><p>Redeliver unacknowledged messages.</p>
<p>Asks the broker to redeliver all unacknowledged messages
on the specified channel.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>requeue</strong> – By default the messages will be redelivered
to the original recipient. With <cite>requeue</cite> set to true, the
server will attempt to requeue the message, potentially then
delivering it to an alternative subscriber.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Consumer.receive">
<tt class="descname">receive</tt><big>(</big><em>body</em>, <em>message</em><big>)</big><a class="headerlink" href="#kombu.messaging.Consumer.receive" title="Permalink to this definition">¶</a></dt>
<dd><p>Method called when a message is received.</p>
<p>This dispatches to the registered <a class="reference internal" href="#kombu.messaging.Consumer.callbacks" title="kombu.messaging.Consumer.callbacks"><tt class="xref py py-attr docutils literal"><span class="pre">callbacks</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-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>body</strong> – The decoded message body.</li>
<li><strong>message</strong> – The <cite>Message</cite> instance.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name" colspan="2">Raises NotImplementedError:</th></tr>
<tr class="field-even field"><td> </td><td class="field-body"><p class="first last">If no consumer callbacks have been
registered.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="kombu.messaging.Consumer.revive">
<tt class="descname">revive</tt><big>(</big><em>channel</em><big>)</big><a class="headerlink" href="#kombu.messaging.Consumer.revive" title="Permalink to this definition">¶</a></dt>
<dd><p>Revive consumer after connection loss.</p>
</dd></dl>
</dd></dl>
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