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<section id="favicons">
<span id="id1"></span><h1>Favicons<a class="headerlink" href="#favicons" title="Link to this heading">¶</a></h1>
<aside class="sidebar">
<p class="sidebar-title">warning</p>
<p>Don’t activate the favicons before reading the documentation.</p>
</aside>
<nav class="contents local" id="contents">
<ul class="simple">
<li><p><a class="reference internal" href="#infrastructure" id="id3">Infrastructure</a></p></li>
<li><p><a class="reference internal" href="#setting-up-the-cache" id="id4">Setting up the cache</a></p>
<ul>
<li><p><a class="reference internal" href="#maintenance-of-the-cache" id="id5">Maintenance of the cache</a></p></li>
</ul>
</li>
<li><p><a class="reference internal" href="#proxy-configuration" id="id6">Proxy configuration</a></p>
<ul>
<li><p><a class="reference internal" href="#register-resolvers" id="id7">Register resolvers</a></p></li>
</ul>
</li>
</ul>
</nav>
<p>Activating the favicons in SearXNG is very easy, but this <strong>generates a
significantly higher load</strong> in the client/server communication and increases
resources needed on the server.</p>
<p>To mitigate these disadvantages, various methods have been implemented,
including a <em>cache</em>. The cache must be parameterized according to your own
requirements and maintained regularly.</p>
<p>To activate favicons in SearXNG’s result list, set a default
<code class="docutils literal notranslate"><span class="pre">favicon_resolver</span></code> in the <a class="reference internal" href="settings/settings_search.html#settings-search"><span class="std std-ref">search</span></a> settings:</p>
<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">search</span><span class="p">:</span>
<span class="w"> </span><span class="nt">favicon_resolver</span><span class="p">:</span><span class="w"> </span><span class="s">"duckduckgo"</span>
</pre></div>
</div>
<p>By default and without any extensions, SearXNG serves these resolvers:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">duckduckgo</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">allesedv</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">google</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">yandex</span></code></p></li>
</ul>
<p>With the above setting favicons are displayed, the user has the option to
deactivate this feature in his settings. If the user is to have the option of
selecting from several <em>resolvers</em>, a further setting is required / but this
setting will be discussed <a class="reference internal" href="#register-resolvers"><span class="std std-ref">later</span></a> in this article,
first we have to setup the favicons cache.</p>
<section id="infrastructure">
<h2><a class="toc-backref" href="#id3" role="doc-backlink">Infrastructure</a><a class="headerlink" href="#infrastructure" title="Link to this heading">¶</a></h2>
<p>The infrastructure for providing the favicons essentially consists of three
parts:</p>
<ul class="simple">
<li><p><a class="reference internal" href="../src/searx.favicons.html#module-searx.favicons.proxy" title="searx.favicons.proxy"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Favicons-Proxy</span></code></a> (aka <em>proxy</em>)</p></li>
<li><p><a class="reference internal" href="../src/searx.favicons.html#module-searx.favicons.resolvers" title="searx.favicons.resolvers"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Favicons-Resolvers</span></code></a> (aka <em>resolver</em>)</p></li>
<li><p><a class="reference internal" href="../src/searx.favicons.html#module-searx.favicons.cache" title="searx.favicons.cache"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Favicons-Cache</span></code></a> (aka <em>cache</em>)</p></li>
</ul>
<p>To protect the privacy of users, the favicons are provided via a <em>proxy</em>. This
<em>proxy</em> is automatically activated with the above activation of a <em>resolver</em>.
Additional requests are required to provide the favicons: firstly, the <em>proxy</em>
must process the incoming requests and secondly, the <em>resolver</em> must make
outgoing requests to obtain the favicons from external sources.</p>
<p>A <em>cache</em> has been developed to massively reduce both, incoming and outgoing
requests. This <em>cache</em> is also activated automatically with the above
activation of a <em>resolver</em>. In its defaults, however, the <em>cache</em> is minimal
and not well suitable for a production environment!</p>
</section>
<section id="setting-up-the-cache">
<span id="favicon-cache-setup"></span><h2><a class="toc-backref" href="#id4" role="doc-backlink">Setting up the cache</a><a class="headerlink" href="#setting-up-the-cache" title="Link to this heading">¶</a></h2>
<p>To parameterize the <em>cache</em> and more settings of the favicons infrastructure, a
<a class="reference external" href="https://toml.io/en/">TOML</a> configuration is created in the file <code class="docutils literal notranslate"><span class="pre">/etc/searxng/favicons.toml</span></code>.</p>
<div class="highlight-toml notranslate"><div class="highlight"><pre><span></span><span class="k">[favicons]</span>
<span class="n">cfg_schema</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="c1"># config's schema version no.</span>
<span class="k">[favicons.cache]</span>
<span class="n">db_url</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"/var/cache/searxng/faviconcache.db"</span><span class="w"> </span><span class="c1"># default: "/tmp/faviconcache.db"</span>
<span class="n">LIMIT_TOTAL_BYTES</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">2147483648</span><span class="w"> </span><span class="c1"># 2 GB / default: 50 MB</span>
<span class="c1"># HOLD_TIME = 5184000 # 60 days / default: 30 days</span>
<span class="c1"># BLOB_MAX_BYTES = 40960 # 40 KB / default 20 KB</span>
<span class="c1"># MAINTENANCE_MODE = "off" # default: "auto"</span>
<span class="c1"># MAINTENANCE_PERIOD = 600 # 10min / default: 1h</span>
</pre></div>
</div>
<dl>
<dt><a class="reference internal" href="../src/searx.favicons.html#searx.favicons.config.FaviconConfig.cfg_schema" title="searx.favicons.config.FaviconConfig.cfg_schema"><code class="xref py py-obj docutils literal notranslate"><span class="pre">cfg_schema</span></code></a>:</dt><dd><p>Is required to trigger any processes required for future upgrades / don’t
change it.</p>
</dd>
<dt><a class="reference internal" href="../src/searx.favicons.html#searx.favicons.cache.FaviconCacheConfig.db_url" title="searx.favicons.cache.FaviconCacheConfig.db_url"><code class="xref py py-obj docutils literal notranslate"><span class="pre">cache.db_url</span></code></a>:</dt><dd><p>The path to the (<a class="reference external" href="https://www.sqlite.org/">SQLite</a>) database file. The default path is in the <a class="reference external" href="https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch03s18.html">/tmp</a>
folder, which is deleted on every reboot and is therefore unsuitable for a
production environment. The <a class="reference external" href="https://refspecs.linuxfoundation.org/FHS_3.0/fhs/index.html">FHS</a> provides the folder for the
application cache</p>
<p>The <a class="reference external" href="https://refspecs.linuxfoundation.org/FHS_3.0/fhs/index.html">FHS</a> provides the folder <a class="reference external" href="https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch05s05.html">/var/cache</a> for the cache of applications, so a
suitable storage location of SearXNG’s caches is folder <code class="docutils literal notranslate"><span class="pre">/var/cache/searxng</span></code>.
In container systems, a volume should be mounted for this folder and in a
standard installation (compare <a class="reference internal" href="installation-searxng.html#create-searxng-user"><span class="std std-ref">Create user</span></a>), the folder must be
created and the user under which the SearXNG process is running must be given
write permission to this folder.</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>sudo<span class="w"> </span>mkdir<span class="w"> </span>/var/cache/searxng
$<span class="w"> </span>sudo<span class="w"> </span>chown<span class="w"> </span>root:searxng<span class="w"> </span>/var/cache/searxng/
$<span class="w"> </span>sudo<span class="w"> </span>chmod<span class="w"> </span>g+w<span class="w"> </span>/var/cache/searxng/
</pre></div>
</div>
</dd>
<dt><a class="reference internal" href="../src/searx.favicons.html#searx.favicons.cache.FaviconCacheConfig.LIMIT_TOTAL_BYTES" title="searx.favicons.cache.FaviconCacheConfig.LIMIT_TOTAL_BYTES"><code class="xref py py-obj docutils literal notranslate"><span class="pre">cache.LIMIT_TOTAL_BYTES</span></code></a>:</dt><dd><p>Maximum of bytes stored in the cache of all blobs. The limit is only reached
at each maintenance interval after which the oldest BLOBs are deleted; the
limit is exceeded during the maintenance period.</p>
<div class="admonition attention">
<p class="admonition-title">Attention</p>
<p>If the maintenance period is too long or maintenance is switched
off completely, the cache grows uncontrollably.</p>
</div>
</dd>
</dl>
<p>SearXNG hosters can change other parameters of the cache as required:</p>
<ul class="simple">
<li><p><a class="reference internal" href="../src/searx.favicons.html#searx.favicons.cache.FaviconCacheConfig.HOLD_TIME" title="searx.favicons.cache.FaviconCacheConfig.HOLD_TIME"><code class="xref py py-obj docutils literal notranslate"><span class="pre">cache.HOLD_TIME</span></code></a></p></li>
<li><p><a class="reference internal" href="../src/searx.favicons.html#searx.favicons.cache.FaviconCacheConfig.BLOB_MAX_BYTES" title="searx.favicons.cache.FaviconCacheConfig.BLOB_MAX_BYTES"><code class="xref py py-obj docutils literal notranslate"><span class="pre">cache.BLOB_MAX_BYTES</span></code></a></p></li>
</ul>
<section id="maintenance-of-the-cache">
<h3><a class="toc-backref" href="#id5" role="doc-backlink">Maintenance of the cache</a><a class="headerlink" href="#maintenance-of-the-cache" title="Link to this heading">¶</a></h3>
<p>Regular maintenance of the cache is required! By default, regular maintenance
is triggered automatically as part of the client requests:</p>
<ul class="simple">
<li><p><a class="reference internal" href="../src/searx.favicons.html#searx.favicons.cache.FaviconCacheConfig.MAINTENANCE_MODE" title="searx.favicons.cache.FaviconCacheConfig.MAINTENANCE_MODE"><code class="xref py py-obj docutils literal notranslate"><span class="pre">cache.MAINTENANCE_MODE</span></code></a> (default <code class="docutils literal notranslate"><span class="pre">auto</span></code>)</p></li>
<li><p><a class="reference internal" href="../src/searx.favicons.html#searx.favicons.cache.FaviconCacheConfig.MAINTENANCE_PERIOD" title="searx.favicons.cache.FaviconCacheConfig.MAINTENANCE_PERIOD"><code class="xref py py-obj docutils literal notranslate"><span class="pre">cache.MAINTENANCE_PERIOD</span></code></a> (default <code class="docutils literal notranslate"><span class="pre">6000</span></code> / 1h)</p></li>
</ul>
<p>As an alternative to maintenance as part of the client request process, it is
also possible to carry out maintenance using an external process. For example,
by creating a <a class="extlink-man reference external" href="https://manpages.debian.org/jump?q=crontab">crontab</a> entry for maintenance:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>python<span class="w"> </span>-m<span class="w"> </span>searx.favicons<span class="w"> </span>cache<span class="w"> </span>maintenance
</pre></div>
</div>
<p>The following command can be used to display the state of the cache:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>python<span class="w"> </span>-m<span class="w"> </span>searx.favicons<span class="w"> </span>cache<span class="w"> </span>state
</pre></div>
</div>
</section>
</section>
<section id="proxy-configuration">
<span id="favicon-proxy-setup"></span><h2><a class="toc-backref" href="#id6" role="doc-backlink">Proxy configuration</a><a class="headerlink" href="#proxy-configuration" title="Link to this heading">¶</a></h2>
<p>Most of the options of the <a class="reference internal" href="../src/searx.favicons.html#module-searx.favicons.proxy" title="searx.favicons.proxy"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Favicons-Proxy</span></code></a> are
already set sensibly with settings from the <a class="reference internal" href="settings/index.html#searxng-settings-yml"><span class="std std-ref">settings.yml</span></a> and should not normally be adjusted.</p>
<div class="highlight-toml notranslate"><div class="highlight"><pre><span></span><span class="k">[favicons.proxy]</span>
<span class="n">max_age</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">5184000</span><span class="w"> </span><span class="c1"># 60 days / default: 7 days (604800 sec)</span>
</pre></div>
</div>
<dl class="simple">
<dt><a class="reference internal" href="../src/searx.favicons.html#searx.favicons.proxy.FaviconProxyConfig.max_age" title="searx.favicons.proxy.FaviconProxyConfig.max_age"><code class="xref py py-obj docutils literal notranslate"><span class="pre">max_age</span></code></a>:</dt><dd><p>The <a class="reference external" href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#response_directives">HTTP Cache-Control max-age</a> response directive indicates that the
response remains fresh until N seconds after the response is generated. This
setting therefore determines how long a favicon remains in the client’s cache.
As a rule, in the favicons infrastructure of SearXNG’s this setting only
affects favicons whose byte size exceeds <a class="reference internal" href="#favicon-cache-setup"><span class="std std-ref">BLOB_MAX_BYTES</span></a> (the other favicons that are already in the cache are embedded as
<a class="reference external" href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URLs">data URL</a> in the <a class="reference internal" href="../src/searx.favicons.html#searx.favicons.proxy.favicon_url" title="searx.favicons.proxy.favicon_url"><code class="xref py py-obj docutils literal notranslate"><span class="pre">generated</span> <span class="pre">HTML</span></code></a>,
which can greatly reduce the number of additional requests).</p>
</dd>
</dl>
<section id="register-resolvers">
<span id="id2"></span><h3><a class="toc-backref" href="#id7" role="doc-backlink">Register resolvers</a><a class="headerlink" href="#register-resolvers" title="Link to this heading">¶</a></h3>
<p>A <code class="xref py py-obj docutils literal notranslate"><span class="pre">resolver</span></code> is a function that obtains the favicon
from an external source. The resolver functions available to the user are
registered with their fully qualified name (<a class="reference external" href="https://en.wikipedia.org/wiki/Fully_qualified_name">FQN</a>) in a <code class="docutils literal notranslate"><span class="pre">resolver_map</span></code>.</p>
<p>If no <code class="docutils literal notranslate"><span class="pre">resolver_map</span></code> is defined in the <code class="docutils literal notranslate"><span class="pre">favicon.toml</span></code>, the favicon
infrastructure of SearXNG generates this <code class="docutils literal notranslate"><span class="pre">resolver_map</span></code> automatically
depending on the <code class="docutils literal notranslate"><span class="pre">settings.yml</span></code>. SearXNG would automatically generate the
following TOML configuration from the following YAML configuration:</p>
<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">search</span><span class="p">:</span>
<span class="w"> </span><span class="nt">favicon_resolver</span><span class="p">:</span><span class="w"> </span><span class="s">"duckduckgo"</span>
</pre></div>
</div>
<div class="highlight-toml notranslate"><div class="highlight"><pre><span></span><span class="k">[favicons.proxy.resolver_map]</span>
<span class="s2">"duckduckgo"</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"searx.favicons.resolvers.duckduckgo"</span>
</pre></div>
</div>
<p>If this automatism is not desired, then (and only then) a separate
<code class="docutils literal notranslate"><span class="pre">resolver_map</span></code> must be created. For example, to give the user two resolvers to
choose from, the following configuration could be used:</p>
<div class="highlight-toml notranslate"><div class="highlight"><pre><span></span><span class="k">[favicons.proxy.resolver_map]</span>
<span class="s2">"duckduckgo"</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"searx.favicons.resolvers.duckduckgo"</span>
<span class="s2">"allesedv"</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"searx.favicons.resolvers.allesedv"</span>
<span class="c1"># "google" = "searx.favicons.resolvers.google"</span>
<span class="c1"># "yandex" = "searx.favicons.resolvers.yandex"</span>
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>With each resolver, the resource requirement increases significantly.</p>
</div>
<p>The number of resolvers increases:</p>
<ul class="simple">
<li><p>the number of incoming/outgoing requests and</p></li>
<li><p>the number of favicons to be stored in the cache.</p></li>
</ul>
<p>In the following we list the resolvers available in the core of SearXNG, but via
the <a class="reference external" href="https://en.wikipedia.org/wiki/Fully_qualified_name">FQN</a> it is also possible to implement your own resolvers and integrate them
into the <em>proxy</em>:</p>
<ul class="simple">
<li><p><a class="reference internal" href="../src/searx.favicons.html#searx.favicons.resolvers.duckduckgo" title="searx.favicons.resolvers.duckduckgo"><code class="xref py py-obj docutils literal notranslate"><span class="pre">searx.favicons.resolvers.duckduckgo</span></code></a></p></li>
<li><p><a class="reference internal" href="../src/searx.favicons.html#searx.favicons.resolvers.allesedv" title="searx.favicons.resolvers.allesedv"><code class="xref py py-obj docutils literal notranslate"><span class="pre">searx.favicons.resolvers.allesedv</span></code></a></p></li>
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