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expire-a-flask-session.html
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expire-a-flask-session.html
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<!DOCTYPE html>
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<meta content="import os from datetime import timedelta from flask import Flask, session, render_template app = Flask(__name__) ..." property='og:description' />
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<article>
<h3 class="reset bold a">flask 设置session过期时间</h3>
<small class="datetime muted">2015-11-06</small>
<hr>
<div class="highlight"><pre><span class="kn">import</span> <span class="nn">os</span>
<span class="kn">from</span> <span class="nn">datetime</span> <span class="kn">import</span> <span class="n">timedelta</span>
<span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">Flask</span><span class="p">,</span> <span class="n">session</span><span class="p">,</span> <span class="n">render_template</span>
<span class="n">app</span> <span class="o">=</span> <span class="n">Flask</span><span class="p">(</span><span class="n">__name__</span><span class="p">)</span>
<span class="n">app</span><span class="o">.</span><span class="n">secret_key</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">urandom</span><span class="p">(</span><span class="mi">24</span><span class="p">)</span>
<span class="n">app</span><span class="o">.</span><span class="n">permanent_session_lifetime</span> <span class="o">=</span> <span class="n">timedelta</span><span class="p">(</span><span class="n">seconds</span><span class="o">=</span><span class="mi">10</span><span class="p">)</span>
<span class="nd">@app.route</span><span class="p">(</span><span class="s">'/'</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">index</span><span class="p">():</span>
<span class="n">session</span><span class="o">.</span><span class="n">permanent</span> <span class="o">=</span> <span class="bp">True</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">session</span><span class="p">[</span><span class="s">'counter'</span><span class="p">]</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">except</span> <span class="ne">KeyError</span><span class="p">:</span>
<span class="n">session</span><span class="p">[</span><span class="s">'counter'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">1</span>
<span class="k">return</span> <span class="s">"Number of reloads on the current session: </span><span class="si">%d</span><span class="s">"</span> <span class="o">%</span> <span class="n">session</span><span class="p">[</span><span class="s">'counter'</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="n">app</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="n">debug</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
</pre></div>
<h3>参数详解</h3>
<p><code>permanent_session_lifetime</code> - session过期时间</p>
<blockquote>
<ul>
<li><a href="http://flask.pocoo.org/docs/0.10/api/#flask.Flask.permanent_session_lifetime">文档</a></li>
<li>默认31天</li>
<li>flask.Flask的属性，所以<code>flask.Flask.permanent_session_lifetime = timedelta(seconds=15)</code>来赋值</li>
<li>也可在config.py里赋值<code>PERMANENT_SESSION_LIFETIME = 15</code></li>
</ul>
</blockquote>
<p><code>permanent</code></p>
<blockquote>
<ul>
<li><a href="http://flask.pocoo.org/docs/0.10/api/#flask.session.permanent">文档</a></li>
<li>默认为<code>False</code>，意思是关掉浏览器就删除session，不管<code>permanent_session_lifetime</code>是否到达</li>
<li>若设置为<code>True</code>,关掉浏览器，如果<code>permanent_session_lifetime</code>未到，则再次打开浏览器，session也会存在，如登陆状态也在</li>
<li>flask.session的属性，<code>session.permanent = True</code>来定义</li>
</ul>
</blockquote>
<h3>例子解析</h3>
<blockquote>
<ul>
<li>因为<code>session.permanent = True</code>，不管是否关闭浏览器，在浏览器没有活动超过10s，session就被删除</li>
<li>如果<code>session.permanent = Flase</code>即默认，有两种情况session会被删除，一种是关闭了浏览器，第二种是未关闭浏览器，但是未活动时间超过10s</li>
</ul>
</blockquote>
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Til next time,<br/>
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maijver
<span class="muted">at 09:11</span>
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