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<h1>Source code for searx.enginelib</h1><div class="highlight"><pre>
<span></span><span class="c1"># SPDX-License-Identifier: AGPL-3.0-or-later</span>
<span class="sd">"""Implementations of the framework for the SearXNG engines.</span>
<span class="sd">- :py:obj:`searx.enginelib.EngineCache`</span>
<span class="sd">- :py:obj:`searx.enginelib.Engine`</span>
<span class="sd">- :py:obj:`searx.enginelib.traits`</span>
<span class="sd">There is a command line for developer purposes and for deeper analysis. Here is</span>
<span class="sd">an example in which the command line is called in the development environment::</span>
<span class="sd"> $ ./manage pyenv.cmd bash --norc --noprofile</span>
<span class="sd"> (py3) python -m searx.enginelib --help</span>
<span class="sd">.. hint::</span>
<span class="sd"> The long term goal is to modularize all implementations of the engine</span>
<span class="sd"> framework here in this Python package. ToDo:</span>
<span class="sd"> - move implementations of the :ref:`searx.engines loader` to a new module in</span>
<span class="sd"> the :py:obj:`searx.enginelib` namespace.</span>
<span class="sd">-----</span>
<span class="sd">"""</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">__future__</span><span class="w"> </span><span class="kn">import</span> <span class="n">annotations</span>
<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s2">"EngineCache"</span><span class="p">,</span> <span class="s2">"Engine"</span><span class="p">,</span> <span class="s2">"ENGINES_CACHE"</span><span class="p">]</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">typing</span><span class="w"> </span><span class="kn">import</span> <span class="n">List</span><span class="p">,</span> <span class="n">Callable</span><span class="p">,</span> <span class="n">TYPE_CHECKING</span><span class="p">,</span> <span class="n">Any</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">string</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">typer</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">..cache</span><span class="w"> </span><span class="kn">import</span> <span class="n">ExpireCache</span><span class="p">,</span> <span class="n">ExpireCacheCfg</span>
<span class="k">if</span> <span class="n">TYPE_CHECKING</span><span class="p">:</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">searx.enginelib</span><span class="w"> </span><span class="kn">import</span> <span class="n">traits</span>
<span class="n">ENGINES_CACHE</span> <span class="o">=</span> <span class="n">ExpireCache</span><span class="o">.</span><span class="n">build_cache</span><span class="p">(</span>
<span class="n">ExpireCacheCfg</span><span class="p">(</span>
<span class="n">name</span><span class="o">=</span><span class="s2">"ENGINES_CACHE"</span><span class="p">,</span>
<span class="n">MAXHOLD_TIME</span><span class="o">=</span><span class="mi">60</span> <span class="o">*</span> <span class="mi">60</span> <span class="o">*</span> <span class="mi">24</span> <span class="o">*</span> <span class="mi">7</span><span class="p">,</span> <span class="c1"># 7 days</span>
<span class="n">MAINTENANCE_PERIOD</span><span class="o">=</span><span class="mi">60</span> <span class="o">*</span> <span class="mi">60</span><span class="p">,</span> <span class="c1"># 2h</span>
<span class="p">)</span>
<span class="p">)</span>
<span class="sd">"""Global :py:obj:`searx.cache.ExpireCacheSQLite` instance where the cached</span>
<span class="sd">values from all engines are stored. The `MAXHOLD_TIME` is 7 days and the</span>
<span class="sd">`MAINTENANCE_PERIOD` is set to two hours."""</span>
<span class="n">app</span> <span class="o">=</span> <span class="n">typer</span><span class="o">.</span><span class="n">Typer</span><span class="p">()</span>
<span class="nd">@app</span><span class="o">.</span><span class="n">command</span><span class="p">()</span>
<span class="k">def</span><span class="w"> </span><span class="nf">state</span><span class="p">():</span>
<span class="w"> </span><span class="sd">"""Show state for the caches of the engines."""</span>
<span class="n">title</span> <span class="o">=</span> <span class="s2">"cache tables and key/values"</span>
<span class="nb">print</span><span class="p">(</span><span class="n">title</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"="</span> <span class="o">*</span> <span class="nb">len</span><span class="p">(</span><span class="n">title</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="n">ENGINES_CACHE</span><span class="o">.</span><span class="n">state</span><span class="p">()</span><span class="o">.</span><span class="n">report</span><span class="p">())</span>
<span class="nb">print</span><span class="p">()</span>
<span class="n">title</span> <span class="o">=</span> <span class="sa">f</span><span class="s2">"properties of </span><span class="si">{</span><span class="n">ENGINES_CACHE</span><span class="o">.</span><span class="n">cfg</span><span class="o">.</span><span class="n">name</span><span class="si">}</span><span class="s2">"</span>
<span class="nb">print</span><span class="p">(</span><span class="n">title</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"="</span> <span class="o">*</span> <span class="nb">len</span><span class="p">(</span><span class="n">title</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">ENGINES_CACHE</span><span class="o">.</span><span class="n">properties</span><span class="p">))</span> <span class="c1"># type: ignore</span>
<span class="nd">@app</span><span class="o">.</span><span class="n">command</span><span class="p">()</span>
<span class="k">def</span><span class="w"> </span><span class="nf">maintenance</span><span class="p">(</span><span class="n">force</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">):</span>
<span class="w"> </span><span class="sd">"""Carry out maintenance on cache of the engines."""</span>
<span class="n">ENGINES_CACHE</span><span class="o">.</span><span class="n">maintenance</span><span class="p">(</span><span class="n">force</span><span class="o">=</span><span class="n">force</span><span class="p">)</span>
<div class="viewcode-block" id="EngineCache">
<a class="viewcode-back" href="../../dev/engines/enginelib.html#searx.enginelib.EngineCache">[docs]</a>
<span class="k">class</span><span class="w"> </span><span class="nc">EngineCache</span><span class="p">:</span>
<span class="w"> </span><span class="sd">"""Persistent (SQLite) key/value cache that deletes its values again after</span>
<span class="sd"> ``expire`` seconds (default/max: :py:obj:`MAXHOLD_TIME</span>
<span class="sd"> <searx.cache.ExpireCacheCfg.MAXHOLD_TIME>`). This class is a wrapper around</span>
<span class="sd"> :py:obj:`ENGINES_CACHE` (:py:obj:`ExpireCacheSQLite</span>
<span class="sd"> <searx.cache.ExpireCacheSQLite>`).</span>
<span class="sd"> In the :origin:`searx/engines/demo_offline.py` engine you can find an</span>
<span class="sd"> exemplary implementation of such a cache other examples are implemented</span>
<span class="sd"> in:</span>
<span class="sd"> - :origin:`searx/engines/radio_browser.py`</span>
<span class="sd"> - :origin:`searx/engines/soundcloud.py`</span>
<span class="sd"> - :origin:`searx/engines/startpage.py`</span>
<span class="sd"> .. code: python</span>
<span class="sd"> from searx.enginelib import EngineCache</span>
<span class="sd"> CACHE: EngineCache</span>
<span class="sd"> def init(engine_settings):</span>
<span class="sd"> global CACHE</span>
<span class="sd"> CACHE = EngineCache(engine_settings["name"])</span>
<span class="sd"> def request(query, params):</span>
<span class="sd"> token = CACHE.get(key="token")</span>
<span class="sd"> if token is None:</span>
<span class="sd"> token = get_token()</span>
<span class="sd"> # cache token of this engine for 1h</span>
<span class="sd"> CACHE.set(key="token", value=token, expire=3600)</span>
<span class="sd"> ...</span>
<span class="sd"> For introspection of the DB, jump into developer environment and run command to</span>
<span class="sd"> show cache state::</span>
<span class="sd"> $ ./manage pyenv.cmd bash --norc --noprofile</span>
<span class="sd"> (py3) python -m searx.enginelib cache state</span>
<span class="sd"> cache tables and key/values</span>
<span class="sd"> ===========================</span>
<span class="sd"> [demo_offline ] 2025-04-22 11:32:50 count --> (int) 4</span>
<span class="sd"> [startpage ] 2025-04-22 12:32:30 SC_CODE --> (str) fSOBnhEMlDfE20</span>
<span class="sd"> [duckduckgo ] 2025-04-22 12:32:31 4dff493e.... --> (str) 4-128634958369380006627592672385352473325</span>
<span class="sd"> [duckduckgo ] 2025-04-22 12:40:06 3e2583e2.... --> (str) 4-263126175288871260472289814259666848451</span>
<span class="sd"> [radio_browser ] 2025-04-23 11:33:08 servers --> (list) ['https://de2.api.radio-browser.info', ...]</span>
<span class="sd"> [soundcloud ] 2025-04-29 11:40:06 guest_client_id --> (str) EjkRJG0BLNEZquRiPZYdNtJdyGtTuHdp</span>
<span class="sd"> [wolframalpha ] 2025-04-22 12:40:06 code --> (str) 5aa79f86205ad26188e0e26e28fb7ae7</span>
<span class="sd"> number of tables: 6</span>
<span class="sd"> number of key/value pairs: 7</span>
<span class="sd"> In the "cache tables and key/values" section, the table name (engine name) is at</span>
<span class="sd"> first position on the second there is the calculated expire date and on the</span>
<span class="sd"> third and fourth position the key/value is shown.</span>
<span class="sd"> About duckduckgo: The *vqd coode* of ddg depends on the query term and therefore</span>
<span class="sd"> the key is a hash value of the query term (to not to store the raw query term).</span>
<span class="sd"> In the "properties of ENGINES_CACHE" section all properties of the SQLiteAppl /</span>
<span class="sd"> ExpireCache and their last modification date are shown::</span>
<span class="sd"> properties of ENGINES_CACHE</span>
<span class="sd"> ===========================</span>
<span class="sd"> [last modified: 2025-04-22 11:32:27] DB_SCHEMA : 1</span>
<span class="sd"> [last modified: 2025-04-22 11:32:27] LAST_MAINTENANCE :</span>
<span class="sd"> [last modified: 2025-04-22 11:32:27] crypt_hash : ca612e3566fdfd7cf7efe...</span>
<span class="sd"> [last modified: 2025-04-22 11:32:30] CACHE-TABLE--demo_offline: demo_offline</span>
<span class="sd"> [last modified: 2025-04-22 11:32:30] CACHE-TABLE--startpage: startpage</span>
<span class="sd"> [last modified: 2025-04-22 11:32:31] CACHE-TABLE--duckduckgo: duckduckgo</span>
<span class="sd"> [last modified: 2025-04-22 11:33:08] CACHE-TABLE--radio_browser: radio_browser</span>
<span class="sd"> [last modified: 2025-04-22 11:40:06] CACHE-TABLE--soundcloud: soundcloud</span>
<span class="sd"> [last modified: 2025-04-22 11:40:06] CACHE-TABLE--wolframalpha: wolframalpha</span>
<span class="sd"> These properties provide information about the state of the ExpireCache and</span>
<span class="sd"> control the behavior. For example, the maintenance intervals are controlled by</span>
<span class="sd"> the last modification date of the LAST_MAINTENANCE property and the hash value</span>
<span class="sd"> of the password can be used to detect whether the password has been changed (in</span>
<span class="sd"> this case the DB entries can no longer be decrypted and the entire cache must be</span>
<span class="sd"> discarded).</span>
<span class="sd"> """</span>
<span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">engine_name</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">expire</span><span class="p">:</span> <span class="nb">int</span> <span class="o">|</span> <span class="kc">None</span> <span class="o">=</span> <span class="kc">None</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">expire</span> <span class="o">=</span> <span class="n">expire</span> <span class="ow">or</span> <span class="n">ENGINES_CACHE</span><span class="o">.</span><span class="n">cfg</span><span class="o">.</span><span class="n">MAXHOLD_TIME</span>
<span class="n">_valid</span> <span class="o">=</span> <span class="s2">"-_."</span> <span class="o">+</span> <span class="n">string</span><span class="o">.</span><span class="n">ascii_letters</span> <span class="o">+</span> <span class="n">string</span><span class="o">.</span><span class="n">digits</span>
<span class="bp">self</span><span class="o">.</span><span class="n">table_name</span> <span class="o">=</span> <span class="s2">""</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="n">c</span> <span class="k">if</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">_valid</span> <span class="k">else</span> <span class="s2">"_"</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">engine_name</span><span class="p">])</span>
<span class="k">def</span><span class="w"> </span><span class="nf">set</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">value</span><span class="p">:</span> <span class="n">Any</span><span class="p">,</span> <span class="n">expire</span><span class="p">:</span> <span class="nb">int</span> <span class="o">|</span> <span class="kc">None</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-></span> <span class="nb">bool</span><span class="p">:</span>
<span class="k">return</span> <span class="n">ENGINES_CACHE</span><span class="o">.</span><span class="n">set</span><span class="p">(</span>
<span class="n">key</span><span class="o">=</span><span class="n">key</span><span class="p">,</span>
<span class="n">value</span><span class="o">=</span><span class="n">value</span><span class="p">,</span>
<span class="n">expire</span><span class="o">=</span><span class="n">expire</span> <span class="ow">or</span> <span class="bp">self</span><span class="o">.</span><span class="n">expire</span><span class="p">,</span>
<span class="n">ctx</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">table_name</span><span class="p">,</span>
<span class="p">)</span>
<span class="k">def</span><span class="w"> </span><span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">)</span> <span class="o">-></span> <span class="n">Any</span><span class="p">:</span>
<span class="k">return</span> <span class="n">ENGINES_CACHE</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="n">default</span><span class="p">,</span> <span class="n">ctx</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">table_name</span><span class="p">)</span>
<span class="k">def</span><span class="w"> </span><span class="nf">secret_hash</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">:</span> <span class="nb">str</span> <span class="o">|</span> <span class="nb">bytes</span><span class="p">)</span> <span class="o">-></span> <span class="nb">str</span><span class="p">:</span>
<span class="k">return</span> <span class="n">ENGINES_CACHE</span><span class="o">.</span><span class="n">secret_hash</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="n">name</span><span class="p">)</span></div>
<div class="viewcode-block" id="Engine">
<a class="viewcode-back" href="../../dev/engines/enginelib.html#searx.enginelib.Engine">[docs]</a>
<span class="k">class</span><span class="w"> </span><span class="nc">Engine</span><span class="p">:</span> <span class="c1"># pylint: disable=too-few-public-methods</span>
<span class="w"> </span><span class="sd">"""Class of engine instances build from YAML settings.</span>
<span class="sd"> Further documentation see :ref:`general engine configuration`.</span>
<span class="sd"> .. hint::</span>
<span class="sd"> This class is currently never initialized and only used for type hinting.</span>
<span class="sd"> """</span>
<span class="c1"># Common options in the engine module</span>
<span class="n">engine_type</span><span class="p">:</span> <span class="nb">str</span>
<span class="w"> </span><span class="sd">"""Type of the engine (:ref:`searx.search.processors`)"""</span>
<span class="n">paging</span><span class="p">:</span> <span class="nb">bool</span>
<span class="w"> </span><span class="sd">"""Engine supports multiple pages."""</span>
<span class="n">time_range_support</span><span class="p">:</span> <span class="nb">bool</span>
<span class="w"> </span><span class="sd">"""Engine supports search time range."""</span>
<span class="n">safesearch</span><span class="p">:</span> <span class="nb">bool</span>
<span class="w"> </span><span class="sd">"""Engine supports SafeSearch"""</span>
<span class="n">language_support</span><span class="p">:</span> <span class="nb">bool</span>
<span class="w"> </span><span class="sd">"""Engine supports languages (locales) search."""</span>
<span class="n">language</span><span class="p">:</span> <span class="nb">str</span>
<span class="w"> </span><span class="sd">"""For an engine, when there is ``language: ...`` in the YAML settings the engine</span>
<span class="sd"> does support only this one language:</span>
<span class="sd"> .. code:: yaml</span>
<span class="sd"> - name: google french</span>
<span class="sd"> engine: google</span>
<span class="sd"> language: fr</span>
<span class="sd"> """</span>
<span class="n">region</span><span class="p">:</span> <span class="nb">str</span>
<span class="w"> </span><span class="sd">"""For an engine, when there is ``region: ...`` in the YAML settings the engine</span>
<span class="sd"> does support only this one region::</span>
<span class="sd"> .. code:: yaml</span>
<span class="sd"> - name: google belgium</span>
<span class="sd"> engine: google</span>
<span class="sd"> region: fr-BE</span>
<span class="sd"> """</span>
<span class="n">fetch_traits</span><span class="p">:</span> <span class="n">Callable</span>
<span class="w"> </span><span class="sd">"""Function to to fetch engine's traits from origin."""</span>
<span class="n">traits</span><span class="p">:</span> <span class="n">traits</span><span class="o">.</span><span class="n">EngineTraits</span>
<span class="w"> </span><span class="sd">"""Traits of the engine."""</span>
<span class="c1"># settings.yml</span>
<span class="n">categories</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span>
<span class="w"> </span><span class="sd">"""Specifies to which :ref:`engine categories` the engine should be added."""</span>
<span class="n">name</span><span class="p">:</span> <span class="nb">str</span>
<span class="w"> </span><span class="sd">"""Name that will be used across SearXNG to define this engine. In settings, on</span>
<span class="sd"> the result page .."""</span>
<span class="n">engine</span><span class="p">:</span> <span class="nb">str</span>
<span class="w"> </span><span class="sd">"""Name of the python file used to handle requests and responses to and from</span>
<span class="sd"> this search engine (file name from :origin:`searx/engines` without</span>
<span class="sd"> ``.py``)."""</span>
<span class="n">enable_http</span><span class="p">:</span> <span class="nb">bool</span>
<span class="w"> </span><span class="sd">"""Enable HTTP (by default only HTTPS is enabled)."""</span>
<span class="n">shortcut</span><span class="p">:</span> <span class="nb">str</span>
<span class="w"> </span><span class="sd">"""Code used to execute bang requests (``!foo``)"""</span>
<span class="n">timeout</span><span class="p">:</span> <span class="nb">float</span>
<span class="w"> </span><span class="sd">"""Specific timeout for search-engine."""</span>
<span class="n">display_error_messages</span><span class="p">:</span> <span class="nb">bool</span>
<span class="w"> </span><span class="sd">"""Display error messages on the web UI."""</span>
<span class="n">proxies</span><span class="p">:</span> <span class="nb">dict</span>
<span class="w"> </span><span class="sd">"""Set proxies for a specific engine (YAML):</span>
<span class="sd"> .. code:: yaml</span>
<span class="sd"> proxies :</span>
<span class="sd"> http: socks5://proxy:port</span>
<span class="sd"> https: socks5://proxy:port</span>
<span class="sd"> """</span>
<span class="n">disabled</span><span class="p">:</span> <span class="nb">bool</span>
<span class="w"> </span><span class="sd">"""To disable by default the engine, but not deleting it. It will allow the</span>
<span class="sd"> user to manually activate it in the settings."""</span>
<span class="n">inactive</span><span class="p">:</span> <span class="nb">bool</span>
<span class="w"> </span><span class="sd">"""Remove the engine from the settings (*disabled & removed*)."""</span>
<span class="n">about</span><span class="p">:</span> <span class="nb">dict</span>
<span class="w"> </span><span class="sd">"""Additional fields describing the engine.</span>
<span class="sd"> .. code:: yaml</span>
<span class="sd"> about:</span>
<span class="sd"> website: https://example.com</span>
<span class="sd"> wikidata_id: Q306656</span>
<span class="sd"> official_api_documentation: https://example.com/api-doc</span>
<span class="sd"> use_official_api: true</span>
<span class="sd"> require_api_key: true</span>
<span class="sd"> results: HTML</span>
<span class="sd"> """</span>
<span class="n">using_tor_proxy</span><span class="p">:</span> <span class="nb">bool</span>
<span class="w"> </span><span class="sd">"""Using tor proxy (``true``) or not (``false``) for this engine."""</span>
<span class="n">send_accept_language_header</span><span class="p">:</span> <span class="nb">bool</span>
<span class="w"> </span><span class="sd">"""When this option is activated, the language (locale) that is selected by</span>
<span class="sd"> the user is used to build and send a ``Accept-Language`` header in the</span>
<span class="sd"> request to the origin search engine."""</span>
<span class="n">tokens</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span>
<span class="w"> </span><span class="sd">"""A list of secret tokens to make this engine *private*, more details see</span>
<span class="sd"> :ref:`private engines`."""</span>
<span class="n">weight</span><span class="p">:</span> <span class="nb">int</span>
<span class="w"> </span><span class="sd">"""Weighting of the results of this engine (:ref:`weight <settings engines>`)."""</span></div>
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