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+
+ <div class="section" id="signals">
+<span id="id1"></span><h1>Signals<a class="headerlink" href="#signals" title="Permalink to this headline">¶</a></h1>
+<p class="versionadded">
+<span class="versionmodified">New in version 0.6.</span></p>
+<p>Starting with Flask 0.6, there is integrated support for signalling in
+Flask. This support is provided by the excellent <a class="reference external" href="http://pypi.python.org/pypi/blinker">blinker</a> library and
+will gracefully fall back if it is not available.</p>
+<p>What are signals? Signals help you decouple applications by sending
+notifications when actions occur elsewhere in the core framework or
+another Flask extensions. In short, signals allow certain senders to
+notify subscribers that something happened.</p>
+<p>Flask comes with a couple of signals and other extensions might provide
+more. Also keep in mind that signals are intended to notify subscribers
+and should not encourage subscribers to modify data. You will notice that
+there are signals that appear to do the same thing like some of the
+builtin decorators do (eg: <a class="reference internal" href="api.html#flask.request_started" title="flask.request_started"><tt class="xref py py-data docutils literal"><span class="pre">request_started</span></tt></a> is very similar
+to <a class="reference internal" href="api.html#flask.Flask.before_request" title="flask.Flask.before_request"><tt class="xref py py-meth docutils literal"><span class="pre">before_request()</span></tt></a>). There are however difference in
+how they work. The core <a class="reference internal" href="api.html#flask.Flask.before_request" title="flask.Flask.before_request"><tt class="xref py py-meth docutils literal"><span class="pre">before_request()</span></tt></a> handler for
+example is executed in a specific order and is able to abort the request
+early by returning a response. In contrast all signal handlers are
+executed in undefined order and do not modify any data.</p>
+<p>The big advantage of signals over handlers is that you can safely
+subscribe to them for the split of a second. These temporary
+subscriptions are helpful for unittesting for example. Say you want to
+know what templates were rendered as part of a request: signals allow you
+to do exactly that.</p>
+<div class="section" id="subscribing-to-signals">
+<h2>Subscribing to Signals<a class="headerlink" href="#subscribing-to-signals" title="Permalink to this headline">¶</a></h2>
+<p>To subscribe to a signal, you can use the
+<a class="reference external" href="http://discorporate.us/projects/Blinker/docs/1.1/api.html#blinker.base.Signal.connect" title="(in Blinker v1.1)"><tt class="xref py py-meth docutils literal"><span class="pre">connect()</span></tt></a> method of a signal. The first
+argument is the function that should be called when the signal is emitted,
+the optional second argument specifies a sender. To unsubscribe from a
+signal, you can use the <a class="reference external" href="http://discorporate.us/projects/Blinker/docs/1.1/api.html#blinker.base.Signal.disconnect" title="(in Blinker v1.1)"><tt class="xref py py-meth docutils literal"><span class="pre">disconnect()</span></tt></a> method.</p>
+<p>For all core Flask signals, the sender is the application that issued the
+signal. When you subscribe to a signal, be sure to also provide a sender
+unless you really want to listen for signals of all applications. This is
+especially true if you are developing an extension.</p>
+<p>Here for example a helper context manager that can be used to figure out
+in a unittest which templates were rendered and what variables were passed
+to the template:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">template_rendered</span>
+<span class="kn">from</span> <span class="nn">contextlib</span> <span class="kn">import</span> <span class="n">contextmanager</span>
+
+<span class="nd">@contextmanager</span>
+<span class="k">def</span> <span class="nf">captured_templates</span><span class="p">(</span><span class="n">app</span><span class="p">):</span>
+ <span class="n">recorded</span> <span class="o">=</span> <span class="p">[]</span>
+ <span class="k">def</span> <span class="nf">record</span><span class="p">(</span><span class="n">sender</span><span class="p">,</span> <span class="n">template</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span>
+ <span class="n">recorded</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">template</span><span class="p">,</span> <span class="n">context</span><span class="p">))</span>
+ <span class="n">template_rendered</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">record</span><span class="p">,</span> <span class="n">app</span><span class="p">)</span>
+ <span class="k">try</span><span class="p">:</span>
+ <span class="k">yield</span> <span class="n">recorded</span>
+ <span class="k">finally</span><span class="p">:</span>
+ <span class="n">template_rendered</span><span class="o">.</span><span class="n">disconnect</span><span class="p">(</span><span class="n">record</span><span class="p">,</span> <span class="n">app</span><span class="p">)</span>
+</pre></div>
+</div>
+<p>This can now easily be paired with a test client:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="k">with</span> <span class="n">captured_templates</span><span class="p">(</span><span class="n">app</span><span class="p">)</span> <span class="k">as</span> <span class="n">templates</span><span class="p">:</span>
+ <span class="n">rv</span> <span class="o">=</span> <span class="n">app</span><span class="o">.</span><span class="n">test_client</span><span class="p">()</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s">&#39;/&#39;</span><span class="p">)</span>
+ <span class="k">assert</span> <span class="n">rv</span><span class="o">.</span><span class="n">status_code</span> <span class="o">==</span> <span class="mi">200</span>
+ <span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">templates</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span>
+ <span class="n">template</span><span class="p">,</span> <span class="n">context</span> <span class="o">=</span> <span class="n">templates</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
+ <span class="k">assert</span> <span class="n">template</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">&#39;index.html&#39;</span>
+ <span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">context</span><span class="p">[</span><span class="s">&#39;items&#39;</span><span class="p">])</span> <span class="o">==</span> <span class="mi">10</span>
+</pre></div>
+</div>
+<p>All the template rendering in the code issued by the application <cite>app</cite>
+in the body of the <cite>with</cite> block will now be recorded in the <cite>templates</cite>
+variable. Whenever a template is rendered, the template object as well as
+context are appended to it.</p>
+<p>Additionally there is a convenient helper method
+(<a class="reference external" href="http://discorporate.us/projects/Blinker/docs/1.1/api.html#blinker.base.Signal.connected_to" title="(in Blinker v1.1)"><tt class="xref py py-meth docutils literal"><span class="pre">connected_to()</span></tt></a>). that allows you to
+temporarily subscribe a function to a signal with is a context manager on
+its own. Because the return value of the context manager cannot be
+specified that way one has to pass the list in as argument:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">template_rendered</span>
+
+<span class="k">def</span> <span class="nf">captured_templates</span><span class="p">(</span><span class="n">app</span><span class="p">,</span> <span class="n">recorded</span><span class="p">):</span>
+ <span class="k">def</span> <span class="nf">record</span><span class="p">(</span><span class="n">sender</span><span class="p">,</span> <span class="n">template</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span>
+ <span class="n">recorded</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">template</span><span class="p">,</span> <span class="n">context</span><span class="p">))</span>
+ <span class="k">return</span> <span class="n">template_rendered</span><span class="o">.</span><span class="n">connected_to</span><span class="p">(</span><span class="n">record</span><span class="p">,</span> <span class="n">app</span><span class="p">)</span>
+</pre></div>
+</div>
+<p>The example above would then look like this:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="n">templates</span> <span class="o">=</span> <span class="p">[]</span>
+<span class="k">with</span> <span class="n">captured_templates</span><span class="p">(</span><span class="n">app</span><span class="p">,</span> <span class="n">templates</span><span class="p">):</span>
+ <span class="o">...</span>
+ <span class="n">template</span><span class="p">,</span> <span class="n">context</span> <span class="o">=</span> <span class="n">templates</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
+</pre></div>
+</div>
+<div class="admonition-blinker-api-changes admonition ">
+<p class="first admonition-title">Blinker API Changes</p>
+<p class="last">The <a class="reference external" href="http://discorporate.us/projects/Blinker/docs/1.1/api.html#blinker.base.Signal.connected_to" title="(in Blinker v1.1)"><tt class="xref py py-meth docutils literal"><span class="pre">connected_to()</span></tt></a> method arrived in Blinker
+with version 1.1.</p>
+</div>
+</div>
+<div class="section" id="creating-signals">
+<h2>Creating Signals<a class="headerlink" href="#creating-signals" title="Permalink to this headline">¶</a></h2>
+<p>If you want to use signals in your own application, you can use the
+blinker library directly. The most common use case are named signals in a
+custom <a class="reference external" href="http://discorporate.us/projects/Blinker/docs/1.1/api.html#blinker.base.Namespace" title="(in Blinker v1.1)"><tt class="xref py py-class docutils literal"><span class="pre">Namespace</span></tt></a>.. This is what is recommended
+most of the time:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">blinker</span> <span class="kn">import</span> <span class="n">Namespace</span>
+<span class="n">my_signals</span> <span class="o">=</span> <span class="n">Namespace</span><span class="p">()</span>
+</pre></div>
+</div>
+<p>Now you can create new signals like this:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="n">model_saved</span> <span class="o">=</span> <span class="n">my_signals</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="s">&#39;model-saved&#39;</span><span class="p">)</span>
+</pre></div>
+</div>
+<p>The name for the signal here makes it unique and also simplifies
+debugging. You can access the name of the signal with the
+<a class="reference external" href="http://discorporate.us/projects/Blinker/docs/1.1/api.html#blinker.base.NamedSignal.name" title="(in Blinker v1.1)"><tt class="xref py py-attr docutils literal"><span class="pre">name</span></tt></a> attribute.</p>
+<div class="admonition-for-extension-developers admonition ">
+<p class="first admonition-title">For Extension Developers</p>
+<p class="last">If you are writing a Flask extension and you want to gracefully degrade for
+missing blinker installations, you can do so by using the
+<a class="reference internal" href="api.html#flask.signals.Namespace" title="flask.signals.Namespace"><tt class="xref py py-class docutils literal"><span class="pre">flask.signals.Namespace</span></tt></a> class.</p>
+</div>
+</div>
+<div class="section" id="sending-signals">
+<h2>Sending Signals<a class="headerlink" href="#sending-signals" title="Permalink to this headline">¶</a></h2>
+<p>If you want to emit a signal, you can do so by calling the
+<a class="reference external" href="http://discorporate.us/projects/Blinker/docs/1.1/api.html#blinker.base.Signal.send" title="(in Blinker v1.1)"><tt class="xref py py-meth docutils literal"><span class="pre">send()</span></tt></a> method. It accepts a sender as first
+argument and optionally some keyword arguments that are forwarded to the
+signal subscribers:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="k">class</span> <span class="nc">Model</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
+ <span class="o">...</span>
+
+ <span class="k">def</span> <span class="nf">save</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+ <span class="n">model_saved</span><span class="o">.</span><span class="n">send</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
+</pre></div>
+</div>
+<p>Try to always pick a good sender. If you have a class that is emitting a
+signal, pass <cite>self</cite> as sender. If you emitting a signal from a random
+function, you can pass <tt class="docutils literal"><span class="pre">current_app._get_current_object()</span></tt> as sender.</p>
+<div class="admonition-passing-proxies-as-senders admonition ">
+<p class="first admonition-title">Passing Proxies as Senders</p>
+<p class="last">Never pass <a class="reference internal" href="api.html#flask.current_app" title="flask.current_app"><tt class="xref py py-data docutils literal"><span class="pre">current_app</span></tt></a> as sender to a signal. Use
+<tt class="docutils literal"><span class="pre">current_app._get_current_object()</span></tt> instead. The reason for this is
+that <a class="reference internal" href="api.html#flask.current_app" title="flask.current_app"><tt class="xref py py-data docutils literal"><span class="pre">current_app</span></tt></a> is a proxy and not the real application
+object.</p>
+</div>
+</div>
+<div class="section" id="decorator-based-signal-subscriptions">
+<h2>Decorator Based Signal Subscriptions<a class="headerlink" href="#decorator-based-signal-subscriptions" title="Permalink to this headline">¶</a></h2>
+<p>With Blinker 1.1 you can also easily subscribe to signals by using the new
+<tt class="xref py py-meth docutils literal"><span class="pre">connect_via()</span></tt> decorator:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">template_rendered</span>
+
+<span class="nd">@template_rendered.connect_via</span><span class="p">(</span><span class="n">app</span><span class="p">)</span>
+<span class="k">def</span> <span class="nf">when_template_rendered</span><span class="p">(</span><span class="n">sender</span><span class="p">,</span> <span class="n">template</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span>
+ <span class="k">print</span> <span class="s">&#39;Template </span><span class="si">%s</span><span class="s"> is rendered with </span><span class="si">%s</span><span class="s">&#39;</span> <span class="o">%</span> <span class="p">(</span><span class="n">template</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">context</span><span class="p">)</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="core-signals">
+<h2>Core Signals<a class="headerlink" href="#core-signals" title="Permalink to this headline">¶</a></h2>
+<p>The following signals exist in Flask:</p>
+<dl class="data">
+<dt>
+<tt class="descclassname">flask.</tt><tt class="descname">template_rendered</tt></dt>
+<dd><p>This signal is sent when a template was successfully rendered. The
+signal is invoked with the instance of the template as <cite>template</cite>
+and the context as dictionary (named <cite>context</cite>).</p>
+<p>Example subscriber:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">log_template_renders</span><span class="p">(</span><span class="n">sender</span><span class="p">,</span> <span class="n">template</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span>
+ <span class="n">sender</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s">&#39;Rendering template &quot;</span><span class="si">%s</span><span class="s">&quot; with context </span><span class="si">%s</span><span class="s">&#39;</span><span class="p">,</span>
+ <span class="n">template</span><span class="o">.</span><span class="n">name</span> <span class="ow">or</span> <span class="s">&#39;string template&#39;</span><span class="p">,</span>
+ <span class="n">context</span><span class="p">)</span>
+
+<span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">template_rendered</span>
+<span class="n">template_rendered</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">log_template_renders</span><span class="p">,</span> <span class="n">app</span><span class="p">)</span>
+</pre></div>
+</div>
+</dd></dl>
+
+<dl class="data">
+<dt>
+<tt class="descclassname">flask.</tt><tt class="descname">request_started</tt></dt>
+<dd><p>This signal is sent before any request processing started but when the
+request context was set up. Because the request context is already
+bound, the subscriber can access the request with the standard global
+proxies such as <a class="reference internal" href="api.html#flask.request" title="flask.request"><tt class="xref py py-class docutils literal"><span class="pre">request</span></tt></a>.</p>
+<p>Example subscriber:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">log_request</span><span class="p">(</span><span class="n">sender</span><span class="p">):</span>
+ <span class="n">sender</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s">&#39;Request context is set up&#39;</span><span class="p">)</span>
+
+<span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">request_started</span>
+<span class="n">request_started</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">log_request</span><span class="p">,</span> <span class="n">app</span><span class="p">)</span>
+</pre></div>
+</div>
+</dd></dl>
+
+<dl class="data">
+<dt>
+<tt class="descclassname">flask.</tt><tt class="descname">request_finished</tt></dt>
+<dd><p>This signal is sent right before the response is sent to the client.
+It is passed the response to be sent named <cite>response</cite>.</p>
+<p>Example subscriber:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">log_response</span><span class="p">(</span><span class="n">sender</span><span class="p">,</span> <span class="n">response</span><span class="p">):</span>
+ <span class="n">sender</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s">&#39;Request context is about to close down. &#39;</span>
+ <span class="s">&#39;Response: </span><span class="si">%s</span><span class="s">&#39;</span><span class="p">,</span> <span class="n">response</span><span class="p">)</span>
+
+<span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">request_finished</span>
+<span class="n">request_finished</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">log_response</span><span class="p">,</span> <span class="n">app</span><span class="p">)</span>
+</pre></div>
+</div>
+</dd></dl>
+
+<dl class="data">
+<dt>
+<tt class="descclassname">flask.</tt><tt class="descname">got_request_exception</tt></dt>
+<dd><p>This signal is sent when an exception happens during request processing.
+It is sent <em>before</em> the standard exception handling kicks in and even
+in debug mode, where no exception handling happens. The exception
+itself is passed to the subscriber as <cite>exception</cite>.</p>
+<p>Example subscriber:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">log_exception</span><span class="p">(</span><span class="n">sender</span><span class="p">,</span> <span class="n">exception</span><span class="p">):</span>
+ <span class="n">sender</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s">&#39;Got exception during processing: </span><span class="si">%s</span><span class="s">&#39;</span><span class="p">,</span> <span class="n">exception</span><span class="p">)</span>
+
+<span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">got_request_exception</span>
+<span class="n">got_request_exception</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">log_exception</span><span class="p">,</span> <span class="n">app</span><span class="p">)</span>
+</pre></div>
+</div>
+</dd></dl>
+
+<dl class="data">
+<dt>
+<tt class="descclassname">flask.</tt><tt class="descname">request_tearing_down</tt></dt>
+<dd><p>This signal is sent when the request is tearing down. This is always
+called, even if an exception is caused. Currently functions listening
+to this signal are called after the regular teardown handlers, but this
+is not something you can rely on.</p>
+<p>Example subscriber:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">close_db_connection</span><span class="p">(</span><span class="n">sender</span><span class="p">):</span>
+ <span class="n">session</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
+
+<span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">request_tearing_down</span>
+<span class="n">request_tearing_down</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">close_db_connection</span><span class="p">,</span> <span class="n">app</span><span class="p">)</span>
+</pre></div>
+</div>
+</dd></dl>
+
+</div>
+</div>
+
+
+ </div>
+ </div>
+ </div>
+ <div class="sphinxsidebar">
+ <div class="sphinxsidebarwrapper"><p class="logo"><a href="index.html">
+ <img class="logo" src="_static/flask.png" alt="Logo"/>
+</a></p>
+ <h3><a href="index.html">Table Of Contents</a></h3>
+ <ul>
+<li><a class="reference internal" href="#">Signals</a><ul>
+<li><a class="reference internal" href="#subscribing-to-signals">Subscribing to Signals</a></li>
+<li><a class="reference internal" href="#creating-signals">Creating Signals</a></li>
+<li><a class="reference internal" href="#sending-signals">Sending Signals</a></li>
+<li><a class="reference internal" href="#decorator-based-signal-subscriptions">Decorator Based Signal Subscriptions</a></li>
+<li><a class="reference internal" href="#core-signals">Core Signals</a></li>
+</ul>
+</li>
+</ul>
+<h3>Related Topics</h3>
+<ul>
+ <li><a href="index.html">Documentation overview</a><ul>
+ <li>Previous: <a href="config.html" title="previous chapter">Configuration Handling</a></li>
+ <li>Next: <a href="views.html" title="next chapter">Pluggable Views</a></li>
+ </ul></li>
+</ul>
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