chendeben
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ProxyPool


			
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  <h1>Source code for proxypool.db</h1><div class="highlight"><pre>
<span></span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd">-------------------------------------------------</span>
<span class="sd">    File Name:     db.py</span>
<span class="sd">    Description:   数据库操作模块，负责对象与底层数据库</span>
<span class="sd">                   的交互。</span>
<span class="sd">    Author:        Liu</span>
<span class="sd">    Date:          2016/12/9</span>
<span class="sd">-------------------------------------------------</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="kn">import</span> <span class="nn">redis</span>

<span class="kn">from</span> <span class="nn">.error</span> <span class="k">import</span> <span class="n">PoolEmptyError</span>
<span class="kn">from</span> <span class="nn">.setting</span> <span class="k">import</span> <span class="n">HOST</span><span class="p">,</span> <span class="n">PORT</span>


<div class="viewcode-block" id="RedisClient"><a class="viewcode-back" href="../../proxypool.html#proxypool.db.RedisClient">[docs]</a><span class="k">class</span> <span class="nc">RedisClient</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Redis数据库操作类。</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">host</span><span class="o">=</span><span class="n">HOST</span><span class="p">,</span> <span class="n">port</span><span class="o">=</span><span class="n">PORT</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">__db</span> <span class="o">=</span> <span class="n">redis</span><span class="o">.</span><span class="n">Redis</span><span class="p">(</span><span class="n">host</span><span class="p">,</span> <span class="n">port</span><span class="p">)</span>

<div class="viewcode-block" id="RedisClient.get"><a class="viewcode-back" href="../../proxypool.html#proxypool.db.RedisClient.get">[docs]</a>    <span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">count</span><span class="o">=</span><span class="mi">1</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;从Pool中获取一定量数据。&quot;&quot;&quot;</span>
        <span class="n">proxies</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">__db</span><span class="o">.</span><span class="n">lrange</span><span class="p">(</span><span class="s2">&quot;proxies&quot;</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="n">count</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">__db</span><span class="o">.</span><span class="n">ltrim</span><span class="p">(</span><span class="s2">&quot;proxies&quot;</span><span class="p">,</span> <span class="n">count</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span>
        <span class="k">return</span> <span class="n">proxies</span></div>

<div class="viewcode-block" id="RedisClient.put"><a class="viewcode-back" href="../../proxypool.html#proxypool.db.RedisClient.put">[docs]</a>    <span class="k">def</span> <span class="nf">put</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">proxy</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;将代理压入Pool中。</span>
<span class="sd">        用Redis的set容器来负责去重，如果proxy能被压入proxy_set，</span>
<span class="sd">        就将其放入proxy pool中，否则不压入。</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">__db</span><span class="o">.</span><span class="n">sadd</span><span class="p">(</span><span class="s2">&quot;proxy_set&quot;</span><span class="p">,</span> <span class="n">proxy</span><span class="p">):</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">__db</span><span class="o">.</span><span class="n">rpush</span><span class="p">(</span><span class="s2">&quot;proxies&quot;</span><span class="p">,</span> <span class="n">proxy</span><span class="p">)</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="k">pass</span></div>

<div class="viewcode-block" id="RedisClient.put_many"><a class="viewcode-back" href="../../proxypool.html#proxypool.db.RedisClient.put_many">[docs]</a>    <span class="k">def</span> <span class="nf">put_many</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">proxies</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;将一定量的代理压入Pool。</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">for</span> <span class="n">proxy</span> <span class="ow">in</span> <span class="n">proxies</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">put</span><span class="p">(</span><span class="n">proxy</span><span class="p">)</span></div>

<div class="viewcode-block" id="RedisClient.pop"><a class="viewcode-back" href="../../proxypool.html#proxypool.db.RedisClient.pop">[docs]</a>    <span class="k">def</span> <span class="nf">pop</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;弹出一个可用代理。</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__db</span><span class="o">.</span><span class="n">blpop</span><span class="p">(</span><span class="s2">&quot;proxies&quot;</span><span class="p">,</span> <span class="mi">30</span><span class="p">)[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s1">&#39;utf-8&#39;</span><span class="p">)</span>
        <span class="k">except</span><span class="p">:</span>
            <span class="k">raise</span> <span class="n">PoolEmptyError</span></div>

    <span class="nd">@property</span>
    <span class="k">def</span> <span class="nf">queue_len</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;获取proxy pool的大小。</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__db</span><span class="o">.</span><span class="n">llen</span><span class="p">(</span><span class="s2">&quot;proxies&quot;</span><span class="p">)</span>

<div class="viewcode-block" id="RedisClient.flush"><a class="viewcode-back" href="../../proxypool.html#proxypool.db.RedisClient.flush">[docs]</a>    <span class="k">def</span> <span class="nf">flush</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;刷新Redis中的全部内容，测试用。</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">__db</span><span class="o">.</span><span class="n">flushall</span><span class="p">()</span></div></div>
</pre></div>

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