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<li class="nav-item nav-item-2"><a href="index.html" accesskey="U">Engine Implementations</a> »</li>
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<li class="nav-item nav-item-this"><a href="">Offline Concept</a></li>
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<section id="offline-concept">
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<h1>Offline Concept<a class="headerlink" href="#offline-concept" title="Link to this heading">¶</a></h1>
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<aside class="sidebar">
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<p class="sidebar-title">offline engines</p>
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<ul class="simple">
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<li><p><a class="reference internal" href="demo/demo_offline.html#demo-offline-engine"><span class="std std-ref">Demo Offline Engine</span></a></p></li>
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<li><p><a class="reference internal" href="offline/command-line-engines.html#engine-command"><span class="std std-ref">Command Line Engines</span></a></p></li>
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<li><p><a class="reference internal" href="offline/sql-engines.html#sql-engines"><span class="std std-ref">SQL Engines</span></a></p></li>
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<li><p><a class="reference internal" href="offline/nosql-engines.html#nosql-engines"><span class="std std-ref">NoSQL databases</span></a></p></li>
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<li><p><a class="reference internal" href="../../src/searx.search.processors.html#module-searx.search.processors.offline" title="searx.search.processors.offline"><code class="xref py py-obj docutils literal notranslate"><span class="pre">searx.search.processors.offline</span></code></a></p></li>
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</ul>
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</aside>
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<p>To extend the functionality of SearXNG, offline engines are going to be
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introduced. An offline engine is an engine which does not need Internet
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connection to perform a search and does not use HTTP to communicate.</p>
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<p>Offline engines can be configured, by adding those to the <cite>engines</cite> list of
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<a class="reference external" href="https://github.com/searxng/searxng/blob/master/searx/settings.yml">settings.yml</a>. An example skeleton for offline
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engines can be found in <a class="reference internal" href="demo/demo_offline.html#demo-offline-engine"><span class="std std-ref">Demo Offline Engine</span></a> (<a class="reference external" href="https://github.com/searxng/searxng/blob/master/searx/engines/demo_offline.py">demo_offline.py</a>).</p>
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<section id="programming-interface">
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<h2>Programming Interface<a class="headerlink" href="#programming-interface" title="Link to this heading">¶</a></h2>
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<dl>
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<dt><a class="reference internal" href="demo/demo_offline.html#searx.engines.demo_offline.init" title="searx.engines.demo_offline.init"><code class="xref py py-func docutils literal notranslate"><span class="pre">init(engine_settings=None)</span></code></a></dt><dd><p>All offline engines can have their own init function to setup the engine before
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accepting requests. The function gets the settings from settings.yml as a
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parameter. This function can be omitted, if there is no need to setup anything
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in advance.</p>
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</dd>
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<dt><code class="xref py py-func docutils literal notranslate"><span class="pre">search(query,</span> <span class="pre">params)</span></code></dt><dd><p>Each offline engine has a function named <code class="docutils literal notranslate"><span class="pre">search</span></code>. This function is
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responsible to perform a search and return the results in a presentable
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format. (Where <em>presentable</em> means presentable by the selected result
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template.)</p>
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<p>The return value is a list of results retrieved by the engine.</p>
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</dd>
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<dt>Engine representation in <code class="docutils literal notranslate"><span class="pre">/config</span></code></dt><dd><p>If an engine is offline, the attribute <code class="docutils literal notranslate"><span class="pre">offline</span></code> is set to <code class="docutils literal notranslate"><span class="pre">True</span></code>.</p>
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</dd>
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</dl>
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</section>
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<section id="extra-dependencies">
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<span id="offline-requirements"></span><h2>Extra Dependencies<a class="headerlink" href="#extra-dependencies" title="Link to this heading">¶</a></h2>
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<p>If an offline engine depends on an external tool, SearXNG does not install it by
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default. When an administrator configures such engine and starts the instance,
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the process returns an error with the list of missing dependencies. Also,
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required dependencies will be added to the comment/description of the engine, so
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admins can install packages in advance.</p>
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<p>If there is a need to install additional packages in <em>Python’s Virtual
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Environment</em> of your SearXNG instance you need to switch into the environment
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(<a class="reference internal" href="../../admin/installation-searxng.html#searxng-src"><span class="std std-ref">Install SearXNG & dependencies</span></a>) first, for this you can use <a class="reference internal" href="../../utils/searxng.sh.html#searxng-sh"><span class="std std-ref">utils/searxng.sh</span></a>:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ sudo utils/searxng.sh instance cmd bash
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(searxng-pyenv)$ pip install ...
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</pre></div>
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</div>
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</section>
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<section id="private-engines-security">
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<h2>Private engines (Security)<a class="headerlink" href="#private-engines-security" title="Link to this heading">¶</a></h2>
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<p>To limit the access to offline engines, if an instance is available publicly,
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administrators can set token(s) for each of the <a class="reference internal" href="../../admin/settings/settings_engine.html#private-engines"><span class="std std-ref">Private Engines (tokens)</span></a>. If a
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query contains a valid token, then SearXNG performs the requested private
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search. If not, requests from an offline engines return errors.</p>
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</section>
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</section>
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<p class="logo"><a href="../../index.html">
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<img class="logo" src="../../_static/searxng-wordmark.svg" alt="Logo"/>
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</a></p>
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<h3><a href="../../index.html">Table of Contents</a></h3>
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<ul class="current">
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<li class="toctree-l1"><a class="reference internal" href="../../user/index.html">User information</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../own-instance.html">Why use a private instance?</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../admin/index.html">Administrator documentation</a></li>
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<li class="toctree-l1 current"><a class="reference internal" href="../index.html">Developer documentation</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="../quickstart.html">Development Quickstart</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../rtm_asdf.html">Runtime Management</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../contribution_guide.html">How to contribute</a></li>
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<li class="toctree-l2 current"><a class="reference internal" href="index.html">Engine Implementations</a><ul class="current">
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<li class="toctree-l3"><a class="reference internal" href="enginelib.html">Engine Library</a></li>
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<li class="toctree-l3"><a class="reference internal" href="engines.html">SearXNG’s engines loader</a></li>
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<li class="toctree-l3"><a class="reference internal" href="engine_overview.html">Engine Overview</a></li>
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<li class="toctree-l3 current"><a class="reference internal" href="index.html#engine-types">Engine Types</a><ul class="current">
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<li class="toctree-l4"><a class="reference internal" href="index.html#online-engines">Online Engines</a></li>
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<li class="toctree-l4 current"><a class="reference internal" href="index.html#offline-engines">Offline Engines</a><ul class="current">
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<li class="toctree-l5 current"><a class="current reference internal" href="#">Offline Concept</a></li>
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<li class="toctree-l5"><a class="reference internal" href="demo/demo_offline.html">Demo Offline Engine</a></li>
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<li class="toctree-l5"><a class="reference internal" href="offline/command-line-engines.html">Command Line Engines</a></li>
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<li class="toctree-l5"><a class="reference internal" href="offline/nosql-engines.html">NoSQL databases</a></li>
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<li class="toctree-l5"><a class="reference internal" href="offline/search-indexer-engines.html">Local Search APIs</a></li>
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<li class="toctree-l5"><a class="reference internal" href="offline/sql-engines.html">SQL Engines</a></li>
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</ul>
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</li>
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<li class="toctree-l4"><a class="reference internal" href="index.html#online-url-search">Online URL Search</a></li>
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<li class="toctree-l4"><a class="reference internal" href="index.html#online-currency">Online Currency</a></li>
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<li class="toctree-l4"><a class="reference internal" href="index.html#online-dictionary">Online Dictionary</a></li>
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</ul>
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</li>
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</ul>
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</li>
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<li class="toctree-l2"><a class="reference internal" href="../search_api.html">Search API</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../plugins.html">Plugins</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../translation.html">Translation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../lxcdev.html">Developing in Linux Containers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../makefile.html">Makefile & <code class="docutils literal notranslate"><span class="pre">./manage</span></code></a></li>
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<li class="toctree-l2"><a class="reference internal" href="../reST.html">reST primer</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../searxng_extra/index.html">Tooling box <code class="docutils literal notranslate"><span class="pre">searxng_extra</span></code></a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="../../utils/index.html">DevOps tooling box</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../src/index.html">Source-Code</a></li>
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<h3>Project Links</h3>
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<li><a href="https://github.com/searxng/searxng/tree/master">Source</a>
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<li><a href="https://searx.space">Public instances</a>
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</ul><h3>Navigation</h3>
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<li><a href="../../index.html">Overview</a>
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<li>Previous: <a href="online/zlibrary.html" title="previous chapter">Z-Library</a>
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<li>Next: <a href="demo/demo_offline.html" title="next chapter">Demo Offline Engine</a></ul>
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<script>document.getElementById('searchbox').style.display = "block"</script>
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<h3>This Page</h3>
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rel="nofollow">Show Source</a></li>
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© Copyright SearXNG team.
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