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@ -5,7 +5,7 @@
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Streaming Contents — Flask Documentation (3.2.x)</title>
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<title>Using URL Processors — Flask Documentation (3.2.x)</title>
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<link rel="stylesheet" type="text/css" href="../_static/pygments.css?v=6625fa76" />
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<link rel="stylesheet" type="text/css" href="../_static/flask.css?v=b87c8d14" />
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<script src="../_static/documentation_options.js?v=56528222"></script>
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@ -15,8 +15,8 @@
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<link rel="icon" href="../_static/shortcut-icon.png"/>
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<link rel="index" title="Index" href="../genindex.html" />
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<link rel="search" title="Search" href="../search.html" />
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<link rel="next" title="Deferred Request Callbacks" href="deferredcallbacks.html" />
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<link rel="prev" title="Adding a favicon" href="favicon.html" />
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<link rel="next" title="Using SQLite 3 with Flask" href="sqlite3.html" />
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<link rel="prev" title="Application Dispatching" href="appdispatch.html" />
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</head><body>
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<div class="related" role="navigation" aria-label="Related">
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<h3>Navigation</h3>
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@ -28,93 +28,145 @@
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<a href="../py-modindex.html" title="Python Module Index"
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>modules</a> |</li>
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<li class="right" >
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<a href="deferredcallbacks.html" title="Deferred Request Callbacks"
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<a href="sqlite3.html" title="Using SQLite 3 with Flask"
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accesskey="N">next</a> |</li>
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<li class="right" >
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<a href="favicon.html" title="Adding a favicon"
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<a href="appdispatch.html" title="Application Dispatching"
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accesskey="P">previous</a> |</li>
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<li class="nav-item nav-item-0"><a href="../index.html">Flask Documentation (3.2.x)</a> »</li>
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<li class="nav-item nav-item-1"><a href="index.html" accesskey="U">Patterns for Flask</a> »</li>
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<li class="nav-item nav-item-this"><a href="">Streaming Contents</a></li>
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<li class="nav-item nav-item-this"><a href="">Using URL Processors</a></li>
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</ul>
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</div>
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</div>
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<div class="document">
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<div class="documentwrapper">
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<div class="bodywrapper">
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<div class="body" role="main">
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<section id="streaming-contents">
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<h1>Streaming Contents<a class="headerlink" href="#streaming-contents" title="Link to this heading">¶</a></h1>
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<p>Sometimes you want to send an enormous amount of data to the client, much
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more than you want to keep in memory. When you are generating the data on
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the fly though, how do you send that back to the client without the
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||||
roundtrip to the filesystem?</p>
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<p>The answer is by using generators and direct responses.</p>
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<section id="basic-usage">
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<h2>Basic Usage<a class="headerlink" href="#basic-usage" title="Link to this heading">¶</a></h2>
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<p>This is a basic view function that generates a lot of CSV data on the fly.
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The trick is to have an inner function that uses a generator to generate
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data and to then invoke that function and pass it to a response object:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="nd">@app</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">'/large.csv'</span><span class="p">)</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">generate_large_csv</span><span class="p">():</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">generate</span><span class="p">():</span>
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<span class="k">for</span> <span class="n">row</span> <span class="ow">in</span> <span class="n">iter_all_rows</span><span class="p">():</span>
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<span class="k">yield</span> <span class="sa">f</span><span class="s2">"</span><span class="si">{</span><span class="s1">','</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">row</span><span class="p">)</span><span class="si">}</span><span class="se">\n</span><span class="s2">"</span>
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<span class="k">return</span> <span class="n">generate</span><span class="p">(),</span> <span class="p">{</span><span class="s2">"Content-Type"</span><span class="p">:</span> <span class="s2">"text/csv"</span><span class="p">}</span>
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</pre></div>
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</div>
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<p>Each <code class="docutils literal notranslate"><span class="pre">yield</span></code> expression is directly sent to the browser. Note though
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that some WSGI middlewares might break streaming, so be careful there in
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debug environments with profilers and other things you might have enabled.</p>
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</section>
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<section id="streaming-from-templates">
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<h2>Streaming from Templates<a class="headerlink" href="#streaming-from-templates" title="Link to this heading">¶</a></h2>
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<p>The Jinja2 template engine supports rendering a template piece by
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piece, returning an iterator of strings. Flask provides the
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<a class="reference internal" href="../api.html#flask.stream_template" title="flask.stream_template"><code class="xref py py-func docutils literal notranslate"><span class="pre">stream_template()</span></code></a> and <a class="reference internal" href="../api.html#flask.stream_template_string" title="flask.stream_template_string"><code class="xref py py-func docutils literal notranslate"><span class="pre">stream_template_string()</span></code></a>
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functions to make this easier to use.</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">flask</span><span class="w"> </span><span class="kn">import</span> <span class="n">stream_template</span>
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<span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"/timeline"</span><span class="p">)</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">timeline</span><span class="p">():</span>
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<span class="k">return</span> <span class="n">stream_template</span><span class="p">(</span><span class="s2">"timeline.html"</span><span class="p">)</span>
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</pre></div>
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<section id="using-url-processors">
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<h1>Using URL Processors<a class="headerlink" href="#using-url-processors" title="Link to this heading">¶</a></h1>
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<details class="changelog">
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<summary>Changelog</summary><div class="versionadded">
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<p><span class="versionmodified added">Added in version 0.7.</span></p>
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</div>
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<p>The parts yielded by the render stream tend to match statement blocks in
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the template.</p>
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</section>
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<section id="streaming-with-context">
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<h2>Streaming with Context<a class="headerlink" href="#streaming-with-context" title="Link to this heading">¶</a></h2>
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<p>The <a class="reference internal" href="../api.html#flask.request" title="flask.request"><code class="xref py py-data docutils literal notranslate"><span class="pre">request</span></code></a> will not be active while the generator is
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running, because the view has already returned at that point. If you try
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to access <code class="docutils literal notranslate"><span class="pre">request</span></code>, you’ll get a <code class="docutils literal notranslate"><span class="pre">RuntimeError</span></code>.</p>
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<p>If your generator function relies on data in <code class="docutils literal notranslate"><span class="pre">request</span></code>, use the
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<a class="reference internal" href="../api.html#flask.stream_with_context" title="flask.stream_with_context"><code class="xref py py-func docutils literal notranslate"><span class="pre">stream_with_context()</span></code></a> wrapper. This will keep the request
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context active during the generator.</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">flask</span><span class="w"> </span><span class="kn">import</span> <span class="n">stream_with_context</span><span class="p">,</span> <span class="n">request</span>
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<span class="kn">from</span><span class="w"> </span><span class="nn">markupsafe</span><span class="w"> </span><span class="kn">import</span> <span class="n">escape</span>
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</details><p>Flask 0.7 introduces the concept of URL processors. The idea is that you
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might have a bunch of resources with common parts in the URL that you
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don’t always explicitly want to provide. For instance you might have a
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bunch of URLs that have the language code in it but you don’t want to have
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to handle it in every single function yourself.</p>
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<p>URL processors are especially helpful when combined with blueprints. We
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will handle both application specific URL processors here as well as
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blueprint specifics.</p>
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<section id="internationalized-application-urls">
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<h2>Internationalized Application URLs<a class="headerlink" href="#internationalized-application-urls" title="Link to this heading">¶</a></h2>
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<p>Consider an application like this:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">flask</span><span class="w"> </span><span class="kn">import</span> <span class="n">Flask</span><span class="p">,</span> <span class="n">g</span>
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<span class="nd">@app</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">'/stream'</span><span class="p">)</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">streamed_response</span><span class="p">():</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">generate</span><span class="p">():</span>
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<span class="k">yield</span> <span class="s1">'<p>Hello '</span>
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<span class="k">yield</span> <span class="n">escape</span><span class="p">(</span><span class="n">request</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s1">'name'</span><span class="p">])</span>
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<span class="k">yield</span> <span class="s1">'!</p>'</span>
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<span class="k">return</span> <span class="n">stream_with_context</span><span class="p">(</span><span class="n">generate</span><span class="p">())</span>
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</pre></div>
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</div>
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<p>It can also be used as a decorator.</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="nd">@stream_with_context</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">generate</span><span class="p">():</span>
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<span class="n">app</span> <span class="o">=</span> <span class="n">Flask</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span>
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<span class="nd">@app</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">'/<lang_code>/'</span><span class="p">)</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">index</span><span class="p">(</span><span class="n">lang_code</span><span class="p">):</span>
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<span class="n">g</span><span class="o">.</span><span class="n">lang_code</span> <span class="o">=</span> <span class="n">lang_code</span>
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<span class="o">...</span>
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<span class="k">return</span> <span class="n">generate</span><span class="p">()</span>
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<span class="nd">@app</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">'/<lang_code>/about'</span><span class="p">)</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">about</span><span class="p">(</span><span class="n">lang_code</span><span class="p">):</span>
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<span class="n">g</span><span class="o">.</span><span class="n">lang_code</span> <span class="o">=</span> <span class="n">lang_code</span>
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<span class="o">...</span>
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</pre></div>
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</div>
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<p>This is an awful lot of repetition as you have to handle the language code
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setting on the <a class="reference internal" href="../api.html#flask.g" title="flask.g"><code class="xref py py-data docutils literal notranslate"><span class="pre">g</span></code></a> object yourself in every single function.
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Sure, a decorator could be used to simplify this, but if you want to
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generate URLs from one function to another you would have to still provide
|
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the language code explicitly which can be annoying.</p>
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<p>For the latter, this is where <a class="reference internal" href="../api.html#flask.Flask.url_defaults" title="flask.Flask.url_defaults"><code class="xref py py-func docutils literal notranslate"><span class="pre">url_defaults()</span></code></a> functions
|
||||
come in. They can automatically inject values into a call to
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||||
<a class="reference internal" href="../api.html#flask.url_for" title="flask.url_for"><code class="xref py py-func docutils literal notranslate"><span class="pre">url_for()</span></code></a>. The code below checks if the
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||||
language code is not yet in the dictionary of URL values and if the
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endpoint wants a value named <code class="docutils literal notranslate"><span class="pre">'lang_code'</span></code>:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="nd">@app</span><span class="o">.</span><span class="n">url_defaults</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">add_language_code</span><span class="p">(</span><span class="n">endpoint</span><span class="p">,</span> <span class="n">values</span><span class="p">):</span>
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<span class="k">if</span> <span class="s1">'lang_code'</span> <span class="ow">in</span> <span class="n">values</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">g</span><span class="o">.</span><span class="n">lang_code</span><span class="p">:</span>
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<span class="k">return</span>
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<span class="k">if</span> <span class="n">app</span><span class="o">.</span><span class="n">url_map</span><span class="o">.</span><span class="n">is_endpoint_expecting</span><span class="p">(</span><span class="n">endpoint</span><span class="p">,</span> <span class="s1">'lang_code'</span><span class="p">):</span>
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<span class="n">values</span><span class="p">[</span><span class="s1">'lang_code'</span><span class="p">]</span> <span class="o">=</span> <span class="n">g</span><span class="o">.</span><span class="n">lang_code</span>
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</pre></div>
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</div>
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<p>The method <a class="reference external" href="https://werkzeug.palletsprojects.com/en/stable/routing/#werkzeug.routing.Map.is_endpoint_expecting" title="(in Werkzeug v3.1.x)"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_endpoint_expecting()</span></code></a> of the URL
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map can be used to figure out if it would make sense to provide a language
|
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code for the given endpoint.</p>
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<p>The reverse of that function are
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<a class="reference internal" href="../api.html#flask.Flask.url_value_preprocessor" title="flask.Flask.url_value_preprocessor"><code class="xref py py-meth docutils literal notranslate"><span class="pre">url_value_preprocessor()</span></code></a>s. They are executed right
|
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after the request was matched and can execute code based on the URL
|
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values. The idea is that they pull information out of the values
|
||||
dictionary and put it somewhere else:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="nd">@app</span><span class="o">.</span><span class="n">url_value_preprocessor</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">pull_lang_code</span><span class="p">(</span><span class="n">endpoint</span><span class="p">,</span> <span class="n">values</span><span class="p">):</span>
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<span class="n">g</span><span class="o">.</span><span class="n">lang_code</span> <span class="o">=</span> <span class="n">values</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s1">'lang_code'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
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</pre></div>
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</div>
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<p>That way you no longer have to do the <code class="code docutils literal notranslate"><span class="pre">lang_code</span></code> assignment to
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<a class="reference internal" href="../api.html#flask.g" title="flask.g"><code class="xref py py-data docutils literal notranslate"><span class="pre">g</span></code></a> in every function. You can further improve that by
|
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writing your own decorator that prefixes URLs with the language code, but
|
||||
the more beautiful solution is using a blueprint. Once the
|
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<code class="docutils literal notranslate"><span class="pre">'lang_code'</span></code> is popped from the values dictionary and it will no longer
|
||||
be forwarded to the view function reducing the code to this:</p>
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||||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">flask</span><span class="w"> </span><span class="kn">import</span> <span class="n">Flask</span><span class="p">,</span> <span class="n">g</span>
|
||||
|
||||
<span class="n">app</span> <span class="o">=</span> <span class="n">Flask</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span>
|
||||
|
||||
<span class="nd">@app</span><span class="o">.</span><span class="n">url_defaults</span>
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">add_language_code</span><span class="p">(</span><span class="n">endpoint</span><span class="p">,</span> <span class="n">values</span><span class="p">):</span>
|
||||
<span class="k">if</span> <span class="s1">'lang_code'</span> <span class="ow">in</span> <span class="n">values</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">g</span><span class="o">.</span><span class="n">lang_code</span><span class="p">:</span>
|
||||
<span class="k">return</span>
|
||||
<span class="k">if</span> <span class="n">app</span><span class="o">.</span><span class="n">url_map</span><span class="o">.</span><span class="n">is_endpoint_expecting</span><span class="p">(</span><span class="n">endpoint</span><span class="p">,</span> <span class="s1">'lang_code'</span><span class="p">):</span>
|
||||
<span class="n">values</span><span class="p">[</span><span class="s1">'lang_code'</span><span class="p">]</span> <span class="o">=</span> <span class="n">g</span><span class="o">.</span><span class="n">lang_code</span>
|
||||
|
||||
<span class="nd">@app</span><span class="o">.</span><span class="n">url_value_preprocessor</span>
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">pull_lang_code</span><span class="p">(</span><span class="n">endpoint</span><span class="p">,</span> <span class="n">values</span><span class="p">):</span>
|
||||
<span class="n">g</span><span class="o">.</span><span class="n">lang_code</span> <span class="o">=</span> <span class="n">values</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s1">'lang_code'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
|
||||
|
||||
<span class="nd">@app</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">'/<lang_code>/'</span><span class="p">)</span>
|
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<span class="k">def</span><span class="w"> </span><span class="nf">index</span><span class="p">():</span>
|
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<span class="o">...</span>
|
||||
|
||||
<span class="nd">@app</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">'/<lang_code>/about'</span><span class="p">)</span>
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">about</span><span class="p">():</span>
|
||||
<span class="o">...</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
</section>
|
||||
<section id="internationalized-blueprint-urls">
|
||||
<h2>Internationalized Blueprint URLs<a class="headerlink" href="#internationalized-blueprint-urls" title="Link to this heading">¶</a></h2>
|
||||
<p>Because blueprints can automatically prefix all URLs with a common string
|
||||
it’s easy to automatically do that for every function. Furthermore
|
||||
blueprints can have per-blueprint URL processors which removes a whole lot
|
||||
of logic from the <a class="reference internal" href="../api.html#flask.Flask.url_defaults" title="flask.Flask.url_defaults"><code class="xref py py-meth docutils literal notranslate"><span class="pre">url_defaults()</span></code></a> function because it no
|
||||
longer has to check if the URL is really interested in a <code class="docutils literal notranslate"><span class="pre">'lang_code'</span></code>
|
||||
parameter:</p>
|
||||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">flask</span><span class="w"> </span><span class="kn">import</span> <span class="n">Blueprint</span><span class="p">,</span> <span class="n">g</span>
|
||||
|
||||
<span class="n">bp</span> <span class="o">=</span> <span class="n">Blueprint</span><span class="p">(</span><span class="s1">'frontend'</span><span class="p">,</span> <span class="vm">__name__</span><span class="p">,</span> <span class="n">url_prefix</span><span class="o">=</span><span class="s1">'/<lang_code>'</span><span class="p">)</span>
|
||||
|
||||
<span class="nd">@bp</span><span class="o">.</span><span class="n">url_defaults</span>
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">add_language_code</span><span class="p">(</span><span class="n">endpoint</span><span class="p">,</span> <span class="n">values</span><span class="p">):</span>
|
||||
<span class="n">values</span><span class="o">.</span><span class="n">setdefault</span><span class="p">(</span><span class="s1">'lang_code'</span><span class="p">,</span> <span class="n">g</span><span class="o">.</span><span class="n">lang_code</span><span class="p">)</span>
|
||||
|
||||
<span class="nd">@bp</span><span class="o">.</span><span class="n">url_value_preprocessor</span>
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">pull_lang_code</span><span class="p">(</span><span class="n">endpoint</span><span class="p">,</span> <span class="n">values</span><span class="p">):</span>
|
||||
<span class="n">g</span><span class="o">.</span><span class="n">lang_code</span> <span class="o">=</span> <span class="n">values</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s1">'lang_code'</span><span class="p">)</span>
|
||||
|
||||
<span class="nd">@bp</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">'/'</span><span class="p">)</span>
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">index</span><span class="p">():</span>
|
||||
<span class="o">...</span>
|
||||
|
||||
<span class="nd">@bp</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">'/about'</span><span class="p">)</span>
|
||||
<span class="k">def</span><span class="w"> </span><span class="nf">about</span><span class="p">():</span>
|
||||
<span class="o">...</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
<p>The <a class="reference internal" href="../api.html#flask.stream_template" title="flask.stream_template"><code class="xref py py-func docutils literal notranslate"><span class="pre">stream_template()</span></code></a> and
|
||||
<a class="reference internal" href="../api.html#flask.stream_template_string" title="flask.stream_template_string"><code class="xref py py-func docutils literal notranslate"><span class="pre">stream_template_string()</span></code></a> functions automatically
|
||||
use <a class="reference internal" href="../api.html#flask.stream_with_context" title="flask.stream_with_context"><code class="xref py py-func docutils literal notranslate"><span class="pre">stream_with_context()</span></code></a> if a request is active.</p>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
|
|
@ -126,19 +178,18 @@ use <a class="reference internal" href="../api.html#flask.stream_with_context" t
|
|||
<span id="sidebar-top"></span>
|
||||
<div class="sphinxsidebar" role="navigation" aria-label="Main">
|
||||
<div class="sphinxsidebarwrapper">
|
||||
|
||||
|
||||
|
||||
|
||||
<p class="logo"><a href="../index.html">
|
||||
<img class="logo" src="../_static/flask-vertical.png" alt="Logo of Flask"/>
|
||||
</a></p>
|
||||
|
||||
|
||||
|
||||
<h3>Contents</h3>
|
||||
<ul>
|
||||
<li><a class="reference internal" href="#">Streaming Contents</a><ul>
|
||||
<li><a class="reference internal" href="#basic-usage">Basic Usage</a></li>
|
||||
<li><a class="reference internal" href="#streaming-from-templates">Streaming from Templates</a></li>
|
||||
<li><a class="reference internal" href="#streaming-with-context">Streaming with Context</a></li>
|
||||
<li><a class="reference internal" href="#">Using URL Processors</a><ul>
|
||||
<li><a class="reference internal" href="#internationalized-application-urls">Internationalized Application URLs</a></li>
|
||||
<li><a class="reference internal" href="#internationalized-blueprint-urls">Internationalized Blueprint URLs</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
|
|
@ -148,8 +199,8 @@ use <a class="reference internal" href="../api.html#flask.stream_with_context" t
|
|||
<ul>
|
||||
<li><a href="index.html">Patterns for Flask</a>
|
||||
<ul>
|
||||
<li>Previous: <a href="favicon.html" title="previous chapter">Adding a favicon</a>
|
||||
<li>Next: <a href="deferredcallbacks.html" title="next chapter">Deferred Request Callbacks</a></ul>
|
||||
<li>Previous: <a href="appdispatch.html" title="previous chapter">Application Dispatching</a>
|
||||
<li>Next: <a href="sqlite3.html" title="next chapter">Using SQLite 3 with Flask</a></ul>
|
||||
</li>
|
||||
</ul>
|
||||
</li>
|
||||
|
|
@ -173,4 +224,4 @@ use <a class="reference internal" href="../api.html#flask.stream_with_context" t
|
|||
Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 8.1.3.
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
</html>
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue