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  <h1>Source code for flask.signals</h1><div class="highlight"><pre>
<span></span><span class="c1"># -*- coding: utf-8 -*-</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    flask.signals</span>
<span class="sd">    ~~~~~~~~~~~~~</span>

<span class="sd">    Implements signals based on blinker if available, otherwise</span>
<span class="sd">    falls silently back to a noop.</span>

<span class="sd">    :copyright: (c) 2015 by Armin Ronacher.</span>
<span class="sd">    :license: BSD, see LICENSE for more details.</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="n">signals_available</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">try</span><span class="p">:</span>
    <span class="kn">from</span> <span class="nn">blinker</span> <span class="k">import</span> <span class="n">Namespace</span>
    <span class="n">signals_available</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<div class="viewcode-block" id="Namespace"><a class="viewcode-back" href="../../flask/flask.html#flask.signals.Namespace">[docs]</a>    <span class="k">class</span> <span class="nc">Namespace</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<div class="viewcode-block" id="Namespace.signal"><a class="viewcode-back" href="../../flask/flask.html#flask.signals.Namespace.signal">[docs]</a>        <span class="k">def</span> <span class="nf">signal</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">doc</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
            <span class="k">return</span> <span class="n">_FakeSignal</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">doc</span><span class="p">)</span></div></div>

    <span class="k">class</span> <span class="nc">_FakeSignal</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;If blinker is unavailable, create a fake class with the same</span>
<span class="sd">        interface that allows sending of signals but will fail with an</span>
<span class="sd">        error on anything else.  Instead of doing anything on send, it</span>
<span class="sd">        will just ignore the arguments and do nothing instead.</span>
<span class="sd">        &quot;&quot;&quot;</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">name</span><span class="p">,</span> <span class="n">doc</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="n">name</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">__doc__</span> <span class="o">=</span> <span class="n">doc</span>
        <span class="k">def</span> <span class="nf">_fail</span><span class="p">(</span><span class="bp">self</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">kwargs</span><span class="p">):</span>
            <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s1">&#39;signalling support is unavailable &#39;</span>
                               <span class="s1">&#39;because the blinker library is &#39;</span>
                               <span class="s1">&#39;not installed.&#39;</span><span class="p">)</span>
        <span class="n">send</span> <span class="o">=</span> <span class="k">lambda</span> <span class="o">*</span><span class="n">a</span><span class="p">,</span> <span class="o">**</span><span class="n">kw</span><span class="p">:</span> <span class="kc">None</span>
        <span class="n">connect</span> <span class="o">=</span> <span class="n">disconnect</span> <span class="o">=</span> <span class="n">has_receivers_for</span> <span class="o">=</span> <span class="n">receivers_for</span> <span class="o">=</span> \
            <span class="n">temporarily_connected_to</span> <span class="o">=</span> <span class="n">connected_to</span> <span class="o">=</span> <span class="n">_fail</span>
        <span class="k">del</span> <span class="n">_fail</span>

<span class="c1"># The namespace for code signals.  If you are not flask code, do</span>
<span class="c1"># not put signals in here.  Create your own namespace instead.</span>
<span class="n">_signals</span> <span class="o">=</span> <span class="n">Namespace</span><span class="p">()</span>


<span class="c1"># Core signals.  For usage examples grep the source code or consult</span>
<span class="c1"># the API documentation in docs/api.rst as well as docs/signals.rst</span>
<span class="n">template_rendered</span> <span class="o">=</span> <span class="n">_signals</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="s1">&#39;template-rendered&#39;</span><span class="p">)</span>
<span class="n">before_render_template</span> <span class="o">=</span> <span class="n">_signals</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="s1">&#39;before-render-template&#39;</span><span class="p">)</span>
<span class="n">request_started</span> <span class="o">=</span> <span class="n">_signals</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="s1">&#39;request-started&#39;</span><span class="p">)</span>
<span class="n">request_finished</span> <span class="o">=</span> <span class="n">_signals</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="s1">&#39;request-finished&#39;</span><span class="p">)</span>
<span class="n">request_tearing_down</span> <span class="o">=</span> <span class="n">_signals</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="s1">&#39;request-tearing-down&#39;</span><span class="p">)</span>
<span class="n">got_request_exception</span> <span class="o">=</span> <span class="n">_signals</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="s1">&#39;got-request-exception&#39;</span><span class="p">)</span>
<span class="n">appcontext_tearing_down</span> <span class="o">=</span> <span class="n">_signals</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="s1">&#39;appcontext-tearing-down&#39;</span><span class="p">)</span>
<span class="n">appcontext_pushed</span> <span class="o">=</span> <span class="n">_signals</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="s1">&#39;appcontext-pushed&#39;</span><span class="p">)</span>
<span class="n">appcontext_popped</span> <span class="o">=</span> <span class="n">_signals</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="s1">&#39;appcontext-popped&#39;</span><span class="p">)</span>
<span class="n">message_flashed</span> <span class="o">=</span> <span class="n">_signals</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="s1">&#39;message-flashed&#39;</span><span class="p">)</span>
</pre></div>

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