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<section id="module-searx.redislib">
<span id="redis-library"></span><span id="searx-redis"></span><h1>Redis Library<a class="headerlink" href="#module-searx.redislib" title="Link to this heading">¶</a></h1>
<p>A collection of convenient functions and redis/lua scripts.</p>
<p>This code was partial inspired by the <a class="reference external" href="https://redis.com/blog/bullet-proofing-lua-scripts-in-redispy/">Bullet-Proofing Lua Scripts in RedisPy</a>
article.</p>
<dl class="py function">
<dt class="sig sig-object py" id="searx.redislib.drop_counter">
<span class="sig-prename descclassname"><span class="pre">searx.redislib.</span></span><span class="sig-name descname"><span class="pre">drop_counter</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">client</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">name</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/redislib.html#drop_counter"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.redislib.drop_counter" title="Link to this definition">¶</a></dt>
<dd><p>Drop counter with redis key <code class="docutils literal notranslate"><span class="pre">SearXNG_counter_<name></span></code></p>
<p>The replacement <code class="docutils literal notranslate"><span class="pre"><name></span></code> is a <em>secret hash</em> of the value from argument
<code class="docutils literal notranslate"><span class="pre">name</span></code> (see <a class="reference internal" href="#searx.redislib.incr_counter" title="searx.redislib.incr_counter"><code class="xref py py-func docutils literal notranslate"><span class="pre">incr_counter()</span></code></a> and <a class="reference internal" href="#searx.redislib.incr_sliding_window" title="searx.redislib.incr_sliding_window"><code class="xref py py-func docutils literal notranslate"><span class="pre">incr_sliding_window()</span></code></a>).</p>
</dd></dl>
<dl class="py function">
<dt class="sig sig-object py" id="searx.redislib.incr_counter">
<span class="sig-prename descclassname"><span class="pre">searx.redislib.</span></span><span class="sig-name descname"><span class="pre">incr_counter</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">client</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">name</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.13)"><span class="pre">str</span></a></span></em>, <em class="sig-param"><span class="n"><span class="pre">limit</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.13)"><span class="pre">int</span></a></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">0</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">expire</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.13)"><span class="pre">int</span></a></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">0</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/redislib.html#incr_counter"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.redislib.incr_counter" title="Link to this definition">¶</a></dt>
<dd><p>Increment a counter and return the new value.</p>
<p>If counter with redis key <code class="docutils literal notranslate"><span class="pre">SearXNG_counter_<name></span></code> does not exists it is
created with initial value 1 returned. The replacement <code class="docutils literal notranslate"><span class="pre"><name></span></code> is a
<em>secret hash</em> of the value from argument <code class="docutils literal notranslate"><span class="pre">name</span></code> (see
<a class="reference internal" href="#searx.redislib.secret_hash" title="searx.redislib.secret_hash"><code class="xref py py-func docutils literal notranslate"><span class="pre">secret_hash()</span></code></a>).</p>
<p>The implementation of the redis counter is the lua script from string
<code class="xref py py-obj docutils literal notranslate"><span class="pre">INCR_COUNTER</span></code>.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>name</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.13)"><em>str</em></a>) – name of the counter</p></li>
<li><p><strong>expire</strong> (int / see <a class="reference external" href="https://redis.io/commands/expire/">EXPIRE</a>) – live-time of the counter in seconds (default <code class="docutils literal notranslate"><span class="pre">None</span></code> means
infinite).</p></li>
<li><p><strong>limit</strong> (int / limit is 2^64 see <a class="reference external" href="https://redis.io/commands/incr/">INCR</a>) – limit where the counter stops to increment (default <code class="docutils literal notranslate"><span class="pre">None</span></code>)</p></li>
</ul>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p>value of the incremented counter</p>
</dd>
</dl>
<p>A simple demo of a counter with expire time and limit:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">6</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">i</span><span class="p">,</span> <span class="n">incr_counter</span><span class="p">(</span><span class="n">client</span><span class="p">,</span> <span class="s2">"foo"</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span> <span class="c1"># max 3, duration 5 sec</span>
<span class="gp">... </span> <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="c1"># from the third call on max has been reached</span>
<span class="gp">...</span>
<span class="go">(0, 1)</span>
<span class="go">(1, 2)</span>
<span class="go">(2, 3)</span>
<span class="go">(3, 3)</span>
<span class="go">(4, 3)</span>
<span class="go">(5, 1)</span>
</pre></div>
</div>
</dd></dl>
<dl class="py function">
<dt class="sig sig-object py" id="searx.redislib.incr_sliding_window">
<span class="sig-prename descclassname"><span class="pre">searx.redislib.</span></span><span class="sig-name descname"><span class="pre">incr_sliding_window</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">client</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">name</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.13)"><span class="pre">str</span></a></span></em>, <em class="sig-param"><span class="n"><span class="pre">duration</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.13)"><span class="pre">int</span></a></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/redislib.html#incr_sliding_window"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.redislib.incr_sliding_window" title="Link to this definition">¶</a></dt>
<dd><p>Increment a sliding-window counter and return the new value.</p>
<p>If counter with redis key <code class="docutils literal notranslate"><span class="pre">SearXNG_counter_<name></span></code> does not exists it is
created with initial value 1 returned. The replacement <code class="docutils literal notranslate"><span class="pre"><name></span></code> is a
<em>secret hash</em> of the value from argument <code class="docutils literal notranslate"><span class="pre">name</span></code> (see
<a class="reference internal" href="#searx.redislib.secret_hash" title="searx.redislib.secret_hash"><code class="xref py py-func docutils literal notranslate"><span class="pre">secret_hash()</span></code></a>).</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>name</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.13)"><em>str</em></a>) – name of the counter</p></li>
<li><p><strong>duration</strong> – live-time of the sliding window in seconds</p></li>
</ul>
</dd>
<dt class="field-even">Typeduration<span class="colon">:</span></dt>
<dd class="field-even"><p>int</p>
</dd>
<dt class="field-odd">Returns<span class="colon">:</span></dt>
<dd class="field-odd"><p>value of the incremented counter</p>
</dd>
</dl>
<p>The implementation of the redis counter is the lua script from string
<code class="xref py py-obj docutils literal notranslate"><span class="pre">INCR_SLIDING_WINDOW</span></code>. The lua script uses <a class="reference external" href="https://redis.com/ebook/part-1-getting-started/chapter-1-getting-to-know-redis/1-2-what-redis-data-structures-look-like/1-2-5-sorted-sets-in-redis/">sorted sets in Redis</a>
to implement a sliding window for the redis key <code class="docutils literal notranslate"><span class="pre">SearXNG_counter_<name></span></code>
(<a class="reference external" href="https://redis.io/commands/zadd/">ZADD</a>). The current <a class="reference external" href="https://redis.io/commands/time/">TIME</a> is used to score the items in the sorted set and
the time window is moved by removing items with a score lower current time
minus <em>duration</em> time (<a class="reference external" href="https://redis.io/commands/zremrangebyscore/">ZREMRANGEBYSCORE</a>).</p>
<p>The <a class="reference external" href="https://redis.io/commands/expire/">EXPIRE</a> time (the duration of the sliding window) is refreshed on each
call (increment) and if there is no call in this duration, the sorted
set expires from the redis DB.</p>
<p>The return value is the amount of items in the sorted set (<a class="reference external" href="https://redis.io/commands/zcount/">ZCOUNT</a>), what
means the number of calls in the sliding window.</p>
<p>A simple demo of the sliding window:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">5</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">incr_sliding_window</span><span class="p">(</span><span class="n">client</span><span class="p">,</span> <span class="s2">"foo"</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span> <span class="c1"># duration 3 sec</span>
<span class="gp">... </span> <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="c1"># from the third call (second) on the window is moved</span>
<span class="gp">...</span>
<span class="go">1</span>
<span class="go">2</span>
<span class="go">3</span>
<span class="go">3</span>
<span class="go">3</span>
<span class="gp">>>> </span><span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span> <span class="c1"># wait until expire</span>
<span class="gp">>>> </span><span class="n">incr_sliding_window</span><span class="p">(</span><span class="n">client</span><span class="p">,</span> <span class="s2">"foo"</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="go">1</span>
</pre></div>
</div>
</dd></dl>
<dl class="py function">
<dt class="sig sig-object py" id="searx.redislib.lua_script_storage">
<span class="sig-prename descclassname"><span class="pre">searx.redislib.</span></span><span class="sig-name descname"><span class="pre">lua_script_storage</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">client</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">script</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/redislib.html#lua_script_storage"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.redislib.lua_script_storage" title="Link to this definition">¶</a></dt>
<dd><p>Returns a redis <a class="reference external" href="https://redis.readthedocs.io/en/stable/commands.html#redis.commands.core.CoreCommands.register_script" title="(in redis-py v99.99.99)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Script</span></code></a> instance.</p>
<p>Due to performance reason the <code class="docutils literal notranslate"><span class="pre">Script</span></code> object is instantiated only once
for a client (<code class="docutils literal notranslate"><span class="pre">client.register_script(..)</span></code>) and is cached in
<a class="reference internal" href="#searx.redislib.LUA_SCRIPT_STORAGE" title="searx.redislib.LUA_SCRIPT_STORAGE"><code class="xref py py-obj docutils literal notranslate"><span class="pre">LUA_SCRIPT_STORAGE</span></code></a>.</p>
</dd></dl>
<dl class="py function">
<dt class="sig sig-object py" id="searx.redislib.purge_by_prefix">
<span class="sig-prename descclassname"><span class="pre">searx.redislib.</span></span><span class="sig-name descname"><span class="pre">purge_by_prefix</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">client</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">prefix</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.13)"><span class="pre">str</span></a></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">'SearXNG_'</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/redislib.html#purge_by_prefix"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.redislib.purge_by_prefix" title="Link to this definition">¶</a></dt>
<dd><p>Purge all keys with <code class="docutils literal notranslate"><span class="pre">prefix</span></code> from database.</p>
<p>Queries all keys in the database by the given prefix and set expire time to
zero. The default prefix will drop all keys which has been set by SearXNG
(drops SearXNG schema entirely from database).</p>
<p>The implementation is the lua script from string <code class="xref py py-obj docutils literal notranslate"><span class="pre">PURGE_BY_PREFIX</span></code>.
The lua script uses <a class="reference external" href="https://redis.io/commands/expire/">EXPIRE</a> instead of <a class="reference external" href="https://redis.io/commands/del/">DEL</a>: if there are a lot keys to
delete and/or their values are big, <cite>DEL</cite> could take more time and blocks
the command loop while <cite>EXPIRE</cite> turns back immediate.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>prefix</strong> – prefix of the key to delete (default: <code class="docutils literal notranslate"><span class="pre">SearXNG_</span></code>)</p>
</dd>
</dl>
</dd></dl>
<dl class="py function">
<dt class="sig sig-object py" id="searx.redislib.secret_hash">
<span class="sig-prename descclassname"><span class="pre">searx.redislib.</span></span><span class="sig-name descname"><span class="pre">secret_hash</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.13)"><span class="pre">str</span></a></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/redislib.html#secret_hash"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.redislib.secret_hash" title="Link to this definition">¶</a></dt>
<dd><p>Creates a hash of the <code class="docutils literal notranslate"><span class="pre">name</span></code>.</p>
<p>Combines argument <code class="docutils literal notranslate"><span class="pre">name</span></code> with the <code class="docutils literal notranslate"><span class="pre">secret_key</span></code> from <a class="reference internal" href="../admin/settings/settings_server.html#settings-server"><span class="std std-ref">server:</span></a>. This function can be used to get a more anonymized name of a Redis
KEY.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>name</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.13)"><em>str</em></a>) – the name to create a secret hash for</p>
</dd>
</dl>
</dd></dl>
<dl class="py data">
<dt class="sig sig-object py" id="searx.redislib.LUA_SCRIPT_STORAGE">
<span class="sig-prename descclassname"><span class="pre">searx.redislib.</span></span><span class="sig-name descname"><span class="pre">LUA_SCRIPT_STORAGE</span></span><em class="property"><span class="w"> </span><span class="p"><span class="pre">=</span></span><span class="w"> </span><span class="pre">{}</span></em><a class="headerlink" href="#searx.redislib.LUA_SCRIPT_STORAGE" title="Link to this definition">¶</a></dt>
<dd><p>A global dictionary to cache client’s <code class="docutils literal notranslate"><span class="pre">Script</span></code> objects, used by
<a class="reference internal" href="#searx.redislib.lua_script_storage" title="searx.redislib.lua_script_storage"><code class="xref py py-obj docutils literal notranslate"><span class="pre">lua_script_storage</span></code></a></p>
</dd></dl>
</section>
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<li class="toctree-l2"><a class="reference internal" href="searx.redisdb.html">Redis DB</a></li>
<li class="toctree-l2 current"><a class="current reference internal" href="#">Redis Library</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#searx.redislib.drop_counter"><code class="docutils literal notranslate"><span class="pre">drop_counter()</span></code></a></li>
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<li class="toctree-l3"><a class="reference internal" href="#searx.redislib.purge_by_prefix"><code class="docutils literal notranslate"><span class="pre">purge_by_prefix()</span></code></a></li>
<li class="toctree-l3"><a class="reference internal" href="#searx.redislib.secret_hash"><code class="docutils literal notranslate"><span class="pre">secret_hash()</span></code></a></li>
<li class="toctree-l3"><a class="reference internal" href="#searx.redislib.LUA_SCRIPT_STORAGE"><code class="docutils literal notranslate"><span class="pre">LUA_SCRIPT_STORAGE</span></code></a></li>
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