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<div class="section" id="examples">
<span id="id1"></span><h1>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h1>
<div class="section" id="task-queue-example">
<span id="id2"></span><h2>Task Queue Example<a class="headerlink" href="#task-queue-example" title="Permalink to this headline">¶</a></h2>
<p>Very simple task queue using pickle, with primitive support
for priorities using different queues.</p>
<p><tt class="file docutils literal"><span class="pre">queues.py</span></tt>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">kombu</span> <span class="kn">import</span> <span class="n">Exchange</span><span class="p">,</span> <span class="n">Queue</span>
<span class="n">task_exchange</span> <span class="o">=</span> <span class="n">Exchange</span><span class="p">(</span><span class="s">"tasks"</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="s">"direct"</span><span class="p">)</span>
<span class="n">task_queues</span> <span class="o">=</span> <span class="p">[</span><span class="n">Queue</span><span class="p">(</span><span class="s">"hipri"</span><span class="p">,</span> <span class="n">task_exchange</span><span class="p">,</span> <span class="n">routing_key</span><span class="o">=</span><span class="s">"hipri"</span><span class="p">),</span>
<span class="n">Queue</span><span class="p">(</span><span class="s">"midpri"</span><span class="p">,</span> <span class="n">task_exchange</span><span class="p">,</span> <span class="n">routing_key</span><span class="o">=</span><span class="s">"midpri"</span><span class="p">),</span>
<span class="n">Queue</span><span class="p">(</span><span class="s">"lopri"</span><span class="p">,</span> <span class="n">task_exchange</span><span class="p">,</span> <span class="n">routing_key</span><span class="o">=</span><span class="s">"lopri"</span><span class="p">)]</span>
</pre></div>
</div>
<p><tt class="file docutils literal"><span class="pre">worker.py</span></tt>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">with_statement</span>
<span class="kn">from</span> <span class="nn">kombu.mixins</span> <span class="kn">import</span> <span class="n">ConsumerMixin</span>
<span class="kn">from</span> <span class="nn">kombu.utils</span> <span class="kn">import</span> <span class="n">kwdict</span><span class="p">,</span> <span class="n">reprcall</span>
<span class="kn">from</span> <span class="nn">queues</span> <span class="kn">import</span> <span class="n">task_queues</span>
<span class="k">class</span> <span class="nc">Worker</span><span class="p">(</span><span class="n">ConsumerMixin</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">connection</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connection</span> <span class="o">=</span> <span class="n">connection</span>
<span class="k">def</span> <span class="nf">get_consumers</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">Consumer</span><span class="p">,</span> <span class="n">channel</span><span class="p">):</span>
<span class="k">return</span> <span class="p">[</span><span class="n">Consumer</span><span class="p">(</span><span class="n">queues</span><span class="o">=</span><span class="n">task_queues</span><span class="p">,</span>
<span class="n">callbacks</span><span class="o">=</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">process_task</span><span class="p">])]</span>
<span class="k">def</span> <span class="nf">process_task</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">body</span><span class="p">,</span> <span class="n">message</span><span class="p">):</span>
<span class="n">fun</span> <span class="o">=</span> <span class="n">body</span><span class="p">[</span><span class="s">"fun"</span><span class="p">]</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">body</span><span class="p">[</span><span class="s">"args"</span><span class="p">]</span>
<span class="n">kwargs</span> <span class="o">=</span> <span class="n">body</span><span class="p">[</span><span class="s">"kwargs"</span><span class="p">]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s">"Got task: </span><span class="si">%s</span><span class="s">"</span><span class="p">,</span> <span class="n">reprcall</span><span class="p">(</span><span class="n">fun</span><span class="o">.</span><span class="n">__name__</span><span class="p">,</span> <span class="n">args</span><span class="p">,</span> <span class="n">kwargs</span><span class="p">))</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">fun</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwdict</span><span class="p">(</span><span class="n">kwargs</span><span class="p">))</span>
<span class="k">except</span> <span class="ne">Exception</span><span class="p">,</span> <span class="n">exc</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s">"task raised exception: </span><span class="si">%r</span><span class="s">"</span><span class="p">,</span> <span class="n">exc</span><span class="p">)</span>
<span class="n">message</span><span class="o">.</span><span class="n">ack</span><span class="p">()</span>
<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">"__main__"</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">kombu</span> <span class="kn">import</span> <span class="n">BrokerConnection</span>
<span class="kn">from</span> <span class="nn">kombu.utils.debug</span> <span class="kn">import</span> <span class="n">setup_logging</span>
<span class="n">setup_logging</span><span class="p">(</span><span class="n">loglevel</span><span class="o">=</span><span class="s">"INFO"</span><span class="p">)</span>
<span class="k">with</span> <span class="n">BrokerConnection</span><span class="p">(</span><span class="s">"amqp://guest:guest@localhost:5672//"</span><span class="p">)</span> <span class="k">as</span> <span class="n">conn</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">Worker</span><span class="p">(</span><span class="n">conn</span><span class="p">)</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
<span class="k">except</span> <span class="ne">KeyboardInterrupt</span><span class="p">:</span>
<span class="k">print</span><span class="p">(</span><span class="s">"bye bye"</span><span class="p">)</span>
</pre></div>
</div>
<p><tt class="file docutils literal"><span class="pre">tasks.py</span></tt>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">hello_task</span><span class="p">(</span><span class="n">who</span><span class="o">=</span><span class="s">"world"</span><span class="p">):</span>
<span class="k">print</span><span class="p">(</span><span class="s">"Hello </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">who</span><span class="p">,</span> <span class="p">))</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre>
</pre></div>
</div>
<p><tt class="file docutils literal"><span class="pre">client.py</span></tt>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">with_statement</span>
<span class="kn">from</span> <span class="nn">kombu.common</span> <span class="kn">import</span> <span class="n">maybe_declare</span>
<span class="kn">from</span> <span class="nn">kombu.pools</span> <span class="kn">import</span> <span class="n">producers</span>
<span class="kn">from</span> <span class="nn">queues</span> <span class="kn">import</span> <span class="n">task_exchange</span>
<span class="n">priority_to_routing_key</span> <span class="o">=</span> <span class="p">{</span><span class="s">"high"</span><span class="p">:</span> <span class="s">"hipri"</span><span class="p">,</span>
<span class="s">"mid"</span><span class="p">:</span> <span class="s">"midpri"</span><span class="p">,</span>
<span class="s">"low"</span><span class="p">:</span> <span class="s">"lopri"</span><span class="p">}</span>
<span class="k">def</span> <span class="nf">send_as_task</span><span class="p">(</span><span class="n">connection</span><span class="p">,</span> <span class="n">fun</span><span class="p">,</span> <span class="n">args</span><span class="o">=</span><span class="p">(),</span> <span class="n">kwargs</span><span class="o">=</span><span class="p">{},</span> <span class="n">priority</span><span class="o">=</span><span class="s">"mid"</span><span class="p">):</span>
<span class="n">payload</span> <span class="o">=</span> <span class="p">{</span><span class="s">"fun"</span><span class="p">:</span> <span class="n">fun</span><span class="p">,</span> <span class="s">"args"</span><span class="p">:</span> <span class="n">args</span><span class="p">,</span> <span class="s">"kwargs"</span><span class="p">:</span> <span class="n">kwargs</span><span class="p">}</span>
<span class="n">routing_key</span> <span class="o">=</span> <span class="n">priority_to_routing_key</span><span class="p">[</span><span class="n">priority</span><span class="p">]</span>
<span class="k">with</span> <span class="n">producers</span><span class="p">[</span><span class="n">connection</span><span class="p">]</span><span class="o">.</span><span class="n">acquire</span><span class="p">(</span><span class="n">block</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span> <span class="k">as</span> <span class="n">producer</span><span class="p">:</span>
<span class="n">maybe_declare</span><span class="p">(</span><span class="n">task_exchange</span><span class="p">,</span> <span class="n">producer</span><span class="o">.</span><span class="n">channel</span><span class="p">)</span>
<span class="n">producer</span><span class="o">.</span><span class="n">publish</span><span class="p">(</span><span class="n">payload</span><span class="p">,</span> <span class="n">serializer</span><span class="o">=</span><span class="s">"pickle"</span><span class="p">,</span>
<span class="n">compression</span><span class="o">=</span><span class="s">"bzip2"</span><span class="p">,</span>
<span class="n">routing_key</span><span class="o">=</span><span class="n">routing_key</span><span class="p">)</span>
<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">"__main__"</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">kombu</span> <span class="kn">import</span> <span class="n">BrokerConnection</span>
<span class="kn">from</span> <span class="nn">tasks</span> <span class="kn">import</span> <span class="n">hello_task</span>
<span class="n">connection</span> <span class="o">=</span> <span class="n">BrokerConnection</span><span class="p">(</span><span class="s">"amqp://guest:guest@localhost:5672//"</span><span class="p">)</span>
<span class="n">send_as_task</span><span class="p">(</span><span class="n">connection</span><span class="p">,</span> <span class="n">fun</span><span class="o">=</span><span class="n">hello_task</span><span class="p">,</span> <span class="n">args</span><span class="o">=</span><span class="p">(</span><span class="s">"Kombu"</span><span class="p">,</span> <span class="p">),</span> <span class="n">kwargs</span><span class="o">=</span><span class="p">{},</span>
<span class="n">priority</span><span class="o">=</span><span class="s">"high"</span><span class="p">)</span>
</pre></div>
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