<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="">
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>django.views.decorators.cache — Django 1.11.20 documentation</title>
<link rel="stylesheet" href="../../../../_static/default.css" type="text/css" />
<link rel="stylesheet" href="../../../../_static/pygments.css" type="text/css" />
<script type="text/javascript" id="documentation_options" data-url_root="../../../../" src="../../../../_static/documentation_options.js"></script>
<script type="text/javascript" src="../../../../_static/jquery.js"></script>
<script type="text/javascript" src="../../../../_static/underscore.js"></script>
<script type="text/javascript" src="../../../../_static/doctools.js"></script>
<script type="text/javascript" src="../../../../_static/language_data.js"></script>
<link rel="index" title="Index" href="../../../../genindex.html" />
<link rel="search" title="Search" href="../../../../search.html" />
<script type="text/javascript" src="../../../../templatebuiltins.js"></script>
<script type="text/javascript">
(function($) {
if (!django_template_builtins) {
// templatebuiltins.js missing, do nothing.
return;
}
$(document).ready(function() {
// Hyperlink Django template tags and filters
var base = "../../../../ref/templates/builtins.html";
if (base == "#") {
// Special case for builtins.html itself
base = "";
}
// Tags are keywords, class '.k'
$("div.highlight\\-html\\+django span.k").each(function(i, elem) {
var tagname = $(elem).text();
if ($.inArray(tagname, django_template_builtins.ttags) != -1) {
var fragment = tagname.replace(/_/, '-');
$(elem).html("<a href='" + base + "#" + fragment + "'>" + tagname + "</a>");
}
});
// Filters are functions, class '.nf'
$("div.highlight\\-html\\+django span.nf").each(function(i, elem) {
var filtername = $(elem).text();
if ($.inArray(filtername, django_template_builtins.tfilters) != -1) {
var fragment = filtername.replace(/_/, '-');
$(elem).html("<a href='" + base + "#" + fragment + "'>" + filtername + "</a>");
}
});
});
})(jQuery);
</script>
</head><body>
<div class="document">
<div id="custom-doc" class="yui-t6">
<div id="hd">
<h1><a href="../../../../index.html">Django 1.11.20 documentation</a></h1>
<div id="global-nav">
<a title="Home page" href="../../../../index.html">Home</a> |
<a title="Table of contents" href="../../../../contents.html">Table of contents</a> |
<a title="Global index" href="../../../../genindex.html">Index</a> |
<a title="Module index" href="../../../../py-modindex.html">Modules</a>
</div>
<div class="nav">
<a href="../../../index.html" title="Module code" accesskey="U">up</a></div>
</div>
<div id="bd">
<div id="yui-main">
<div class="yui-b">
<div class="yui-g" id="_modules-django-views-decorators-cache">
<h1>Source code for django.views.decorators.cache</h1><div class="highlight"><pre>
<span></span><span class="kn">from</span> <span class="nn">functools</span> <span class="k">import</span> <span class="n">wraps</span>
<span class="kn">from</span> <span class="nn">django.middleware.cache</span> <span class="k">import</span> <span class="n">CacheMiddleware</span>
<span class="kn">from</span> <span class="nn">django.utils.cache</span> <span class="k">import</span> <span class="n">add_never_cache_headers</span><span class="p">,</span> <span class="n">patch_cache_control</span>
<span class="kn">from</span> <span class="nn">django.utils.decorators</span> <span class="k">import</span> <span class="p">(</span>
<span class="n">available_attrs</span><span class="p">,</span> <span class="n">decorator_from_middleware_with_args</span><span class="p">,</span>
<span class="p">)</span>
<span class="k">def</span> <span class="nf">cache_page</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="sd">"""</span>
<span class="sd"> Decorator for views that tries getting the page from the cache and</span>
<span class="sd"> populates the cache if the page isn't in the cache yet.</span>
<span class="sd"> The cache is keyed by the URL and some data from the headers.</span>
<span class="sd"> Additionally there is the key prefix that is used to distinguish different</span>
<span class="sd"> cache areas in a multi-site setup. You could use the</span>
<span class="sd"> get_current_site().domain, for example, as that is unique across a Django</span>
<span class="sd"> project.</span>
<span class="sd"> Additionally, all headers from the response's Vary header will be taken</span>
<span class="sd"> into account on caching -- just like the middleware does.</span>
<span class="sd"> """</span>
<span class="c1"># We also add some asserts to give better error messages in case people are</span>
<span class="c1"># using other ways to call cache_page that no longer work.</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">args</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">1</span> <span class="ow">or</span> <span class="n">callable</span><span class="p">(</span><span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">]):</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s2">"cache_page has a single mandatory positional argument: timeout"</span><span class="p">)</span>
<span class="n">cache_timeout</span> <span class="o">=</span> <span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">cache_alias</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s1">'cache'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="n">key_prefix</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s1">'key_prefix'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">if</span> <span class="n">kwargs</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s2">"cache_page has two optional keyword arguments: cache and key_prefix"</span><span class="p">)</span>
<span class="k">return</span> <span class="n">decorator_from_middleware_with_args</span><span class="p">(</span><span class="n">CacheMiddleware</span><span class="p">)(</span>
<span class="n">cache_timeout</span><span class="o">=</span><span class="n">cache_timeout</span><span class="p">,</span> <span class="n">cache_alias</span><span class="o">=</span><span class="n">cache_alias</span><span class="p">,</span> <span class="n">key_prefix</span><span class="o">=</span><span class="n">key_prefix</span>
<span class="p">)</span>
<div class="viewcode-block" id="cache_control"><a class="viewcode-back" href="../../../../topics/http/decorators.html#django.views.decorators.cache.cache_control">[docs]</a><span class="k">def</span> <span class="nf">cache_control</span><span class="p">(</span><span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">_cache_controller</span><span class="p">(</span><span class="n">viewfunc</span><span class="p">):</span>
<span class="nd">@wraps</span><span class="p">(</span><span class="n">viewfunc</span><span class="p">,</span> <span class="n">assigned</span><span class="o">=</span><span class="n">available_attrs</span><span class="p">(</span><span class="n">viewfunc</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">_cache_controlled</span><span class="p">(</span><span class="n">request</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">kw</span><span class="p">):</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">viewfunc</span><span class="p">(</span><span class="n">request</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">kw</span><span class="p">)</span>
<span class="n">patch_cache_control</span><span class="p">(</span><span class="n">response</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="k">return</span> <span class="n">response</span>
<span class="k">return</span> <span class="n">_cache_controlled</span>
<span class="k">return</span> <span class="n">_cache_controller</span></div>
<div class="viewcode-block" id="never_cache"><a class="viewcode-back" href="../../../../topics/http/decorators.html#django.views.decorators.cache.never_cache">[docs]</a><span class="k">def</span> <span class="nf">never_cache</span><span class="p">(</span><span class="n">view_func</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Decorator that adds headers to a response so that it will</span>
<span class="sd"> never be cached.</span>
<span class="sd"> """</span>
<span class="nd">@wraps</span><span class="p">(</span><span class="n">view_func</span><span class="p">,</span> <span class="n">assigned</span><span class="o">=</span><span class="n">available_attrs</span><span class="p">(</span><span class="n">view_func</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">_wrapped_view_func</span><span class="p">(</span><span class="n">request</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="n">response</span> <span class="o">=</span> <span class="n">view_func</span><span class="p">(</span><span class="n">request</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="n">add_never_cache_headers</span><span class="p">(</span><span class="n">response</span><span class="p">)</span>
<span class="k">return</span> <span class="n">response</span>
<span class="k">return</span> <span class="n">_wrapped_view_func</span></div>
</pre></div>
</div>
</div>
</div>
<div class="yui-b" id="sidebar">
<div class="sphinxsidebar" role="navigation" aria-label="main navigation">
<div class="sphinxsidebarwrapper">
<div id="searchbox" style="display: none" role="search">
<h3>Quick search</h3>
<div class="searchformwrapper">
<form class="search" action="../../../../search.html" method="get">
<input type="text" name="q" />
<input type="submit" value="Go" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
</div>
</div>
<h3>Last update:</h3>
<p class="topless">Feb 11, 2019</p>
</div>
</div>
<div id="ft">
<div class="nav">
<a href="../../../index.html" title="Module code" accesskey="U">up</a></div>
</div>
</div>
<div class="clearer"></div>
</div>
</body>
</html>
