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<h1>Source code for searx.engines</h1><div class="highlight"><pre>
<span></span><span class="c1"># SPDX-License-Identifier: AGPL-3.0-or-later</span>
<span class="sd">"""Load and initialize the ``engines``, see :py:func:`load_engines` and register</span>
<span class="sd">:py:obj:`engine_shortcuts`.</span>
<span class="sd">usage::</span>
<span class="sd"> load_engines( settings['engines'] )</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">annotations</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">copy</span>
<span class="kn">from</span> <span class="nn">os.path</span> <span class="kn">import</span> <span class="n">realpath</span><span class="p">,</span> <span class="n">dirname</span>
<span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">TYPE_CHECKING</span><span class="p">,</span> <span class="n">Dict</span>
<span class="kn">import</span> <span class="nn">types</span>
<span class="kn">import</span> <span class="nn">inspect</span>
<span class="kn">from</span> <span class="nn">searx</span> <span class="kn">import</span> <span class="n">logger</span><span class="p">,</span> <span class="n">settings</span>
<span class="kn">from</span> <span class="nn">searx.utils</span> <span class="kn">import</span> <span class="n">load_module</span>
<span class="k">if</span> <span class="n">TYPE_CHECKING</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">searx.enginelib</span> <span class="kn">import</span> <span class="n">Engine</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logger</span><span class="o">.</span><span class="n">getChild</span><span class="p">(</span><span class="s1">'engines'</span><span class="p">)</span>
<span class="n">ENGINE_DIR</span> <span class="o">=</span> <span class="n">dirname</span><span class="p">(</span><span class="n">realpath</span><span class="p">(</span><span class="vm">__file__</span><span class="p">))</span>
<span class="n">ENGINE_DEFAULT_ARGS</span> <span class="o">=</span> <span class="p">{</span>
<span class="c1"># Common options in the engine module</span>
<span class="s2">"engine_type"</span><span class="p">:</span> <span class="s2">"online"</span><span class="p">,</span>
<span class="s2">"paging"</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">"time_range_support"</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">"safesearch"</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="c1"># settings.yml</span>
<span class="s2">"categories"</span><span class="p">:</span> <span class="p">[</span><span class="s2">"general"</span><span class="p">],</span>
<span class="s2">"enable_http"</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">"shortcut"</span><span class="p">:</span> <span class="s2">"-"</span><span class="p">,</span>
<span class="s2">"timeout"</span><span class="p">:</span> <span class="n">settings</span><span class="p">[</span><span class="s2">"outgoing"</span><span class="p">][</span><span class="s2">"request_timeout"</span><span class="p">],</span>
<span class="s2">"display_error_messages"</span><span class="p">:</span> <span class="kc">True</span><span class="p">,</span>
<span class="s2">"disabled"</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">"inactive"</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">"about"</span><span class="p">:</span> <span class="p">{},</span>
<span class="s2">"using_tor_proxy"</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">"send_accept_language_header"</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">"tokens"</span><span class="p">:</span> <span class="p">[],</span>
<span class="s2">"max_page"</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span>
<span class="p">}</span>
<span class="c1"># set automatically when an engine does not have any tab category</span>
<span class="n">DEFAULT_CATEGORY</span> <span class="o">=</span> <span class="s1">'other'</span>
<span class="c1"># Defaults for the namespace of an engine module, see :py:func:`load_engine`</span>
<span class="n">categories</span> <span class="o">=</span> <span class="p">{</span><span class="s1">'general'</span><span class="p">:</span> <span class="p">[]}</span>
<span class="n">engines</span><span class="p">:</span> <span class="n">Dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Engine</span> <span class="o">|</span> <span class="n">types</span><span class="o">.</span><span class="n">ModuleType</span><span class="p">]</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">engine_shortcuts</span> <span class="o">=</span> <span class="p">{}</span>
<span class="sd">"""Simple map of registered *shortcuts* to name of the engine (or ``None``).</span>
<span class="sd">::</span>
<span class="sd"> engine_shortcuts[engine.shortcut] = engine.name</span>
<span class="sd">:meta hide-value:</span>
<span class="sd">"""</span>
<span class="k">def</span> <span class="nf">check_engine_module</span><span class="p">(</span><span class="n">module</span><span class="p">:</span> <span class="n">types</span><span class="o">.</span><span class="n">ModuleType</span><span class="p">):</span>
<span class="c1"># probe unintentional name collisions / for example name collisions caused</span>
<span class="c1"># by import statements in the engine module ..</span>
<span class="c1"># network: https://github.com/searxng/searxng/issues/762#issuecomment-1605323861</span>
<span class="n">obj</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">module</span><span class="p">,</span> <span class="s1">'network'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">if</span> <span class="n">obj</span> <span class="ow">and</span> <span class="n">inspect</span><span class="o">.</span><span class="n">ismodule</span><span class="p">(</span><span class="n">obj</span><span class="p">):</span>
<span class="n">msg</span> <span class="o">=</span> <span class="sa">f</span><span class="s1">'type of </span><span class="si">{</span><span class="n">module</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s1">.network is a module (</span><span class="si">{</span><span class="n">obj</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s1">), expected a string'</span>
<span class="c1"># logger.error(msg)</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span>
<div class="viewcode-block" id="load_engine">
<a class="viewcode-back" href="../../dev/engines/engines.html#searx.engines.load_engine">[docs]</a>
<span class="k">def</span> <span class="nf">load_engine</span><span class="p">(</span><span class="n">engine_data</span><span class="p">:</span> <span class="nb">dict</span><span class="p">)</span> <span class="o">-></span> <span class="n">Engine</span> <span class="o">|</span> <span class="n">types</span><span class="o">.</span><span class="n">ModuleType</span> <span class="o">|</span> <span class="kc">None</span><span class="p">:</span>
<span class="w"> </span><span class="sd">"""Load engine from ``engine_data``.</span>
<span class="sd"> :param dict engine_data: Attributes from YAML ``settings:engines/<engine>``</span>
<span class="sd"> :return: initialized namespace of the ``<engine>``.</span>
<span class="sd"> 1. create a namespace and load module of the ``<engine>``</span>
<span class="sd"> 2. update namespace with the defaults from :py:obj:`ENGINE_DEFAULT_ARGS`</span>
<span class="sd"> 3. update namespace with values from ``engine_data``</span>
<span class="sd"> If engine *is active*, return namespace of the engine, otherwise return</span>
<span class="sd"> ``None``.</span>
<span class="sd"> This function also returns ``None`` if initialization of the namespace fails</span>
<span class="sd"> for one of the following reasons:</span>
<span class="sd"> - engine name contains underscore</span>
<span class="sd"> - engine name is not lowercase</span>
<span class="sd"> - required attribute is not set :py:func:`is_missing_required_attributes`</span>
<span class="sd"> """</span>
<span class="c1"># pylint: disable=too-many-return-statements</span>
<span class="n">engine_name</span> <span class="o">=</span> <span class="n">engine_data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'name'</span><span class="p">)</span>
<span class="k">if</span> <span class="n">engine_name</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">'An engine does not have a "name" field'</span><span class="p">)</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="k">if</span> <span class="s1">'_'</span> <span class="ow">in</span> <span class="n">engine_name</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">'Engine name contains underscore: "</span><span class="si">{}</span><span class="s1">"'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine_name</span><span class="p">))</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="k">if</span> <span class="n">engine_name</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span> <span class="o">!=</span> <span class="n">engine_name</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s1">'Engine name is not lowercase: "</span><span class="si">{}</span><span class="s1">", converting to lowercase'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine_name</span><span class="p">))</span>
<span class="n">engine_name</span> <span class="o">=</span> <span class="n">engine_name</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="n">engine_data</span><span class="p">[</span><span class="s1">'name'</span><span class="p">]</span> <span class="o">=</span> <span class="n">engine_name</span>
<span class="c1"># load_module</span>
<span class="n">module_name</span> <span class="o">=</span> <span class="n">engine_data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'engine'</span><span class="p">)</span>
<span class="k">if</span> <span class="n">module_name</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">'The "engine" field is missing for the engine named "</span><span class="si">{}</span><span class="s1">"'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine_name</span><span class="p">))</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">engine</span> <span class="o">=</span> <span class="n">load_module</span><span class="p">(</span><span class="n">module_name</span> <span class="o">+</span> <span class="s1">'.py'</span><span class="p">,</span> <span class="n">ENGINE_DIR</span><span class="p">)</span>
<span class="k">except</span> <span class="p">(</span><span class="ne">SyntaxError</span><span class="p">,</span> <span class="ne">KeyboardInterrupt</span><span class="p">,</span> <span class="ne">SystemExit</span><span class="p">,</span> <span class="ne">SystemError</span><span class="p">,</span> <span class="ne">ImportError</span><span class="p">,</span> <span class="ne">RuntimeError</span><span class="p">):</span>
<span class="n">logger</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span><span class="s1">'Fatal exception in engine "</span><span class="si">{}</span><span class="s1">"'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">module_name</span><span class="p">))</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">BaseException</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span><span class="s1">'Cannot load engine "</span><span class="si">{}</span><span class="s1">"'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">module_name</span><span class="p">))</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="n">check_engine_module</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<span class="n">update_engine_attributes</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">engine_data</span><span class="p">)</span>
<span class="n">update_attributes_for_tor</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<span class="c1"># avoid cyclic imports</span>
<span class="c1"># pylint: disable=import-outside-toplevel</span>
<span class="kn">from</span> <span class="nn">searx.enginelib.traits</span> <span class="kn">import</span> <span class="n">EngineTraitsMap</span>
<span class="n">trait_map</span> <span class="o">=</span> <span class="n">EngineTraitsMap</span><span class="o">.</span><span class="n">from_data</span><span class="p">()</span>
<span class="n">trait_map</span><span class="o">.</span><span class="n">set_traits</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">is_engine_active</span><span class="p">(</span><span class="n">engine</span><span class="p">):</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="k">if</span> <span class="n">is_missing_required_attributes</span><span class="p">(</span><span class="n">engine</span><span class="p">):</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="n">set_loggers</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">engine_name</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">cat</span> <span class="ow">in</span> <span class="n">settings</span><span class="p">[</span><span class="s1">'categories_as_tabs'</span><span class="p">]</span> <span class="k">for</span> <span class="n">cat</span> <span class="ow">in</span> <span class="n">engine</span><span class="o">.</span><span class="n">categories</span><span class="p">):</span>
<span class="n">engine</span><span class="o">.</span><span class="n">categories</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">DEFAULT_CATEGORY</span><span class="p">)</span>
<span class="k">return</span> <span class="n">engine</span></div>
<span class="k">def</span> <span class="nf">set_loggers</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">engine_name</span><span class="p">):</span>
<span class="c1"># set the logger for engine</span>
<span class="n">engine</span><span class="o">.</span><span class="n">logger</span> <span class="o">=</span> <span class="n">logger</span><span class="o">.</span><span class="n">getChild</span><span class="p">(</span><span class="n">engine_name</span><span class="p">)</span>
<span class="c1"># the engine may have load some other engines</span>
<span class="c1"># may sure the logger is initialized</span>
<span class="c1"># use sys.modules.copy() to avoid "RuntimeError: dictionary changed size during iteration"</span>
<span class="c1"># see https://github.com/python/cpython/issues/89516</span>
<span class="c1"># and https://docs.python.org/3.10/library/sys.html#sys.modules</span>
<span class="n">modules</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">modules</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
<span class="k">for</span> <span class="n">module_name</span><span class="p">,</span> <span class="n">module</span> <span class="ow">in</span> <span class="n">modules</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="k">if</span> <span class="p">(</span>
<span class="n">module_name</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">"searx.engines"</span><span class="p">)</span>
<span class="ow">and</span> <span class="n">module_name</span> <span class="o">!=</span> <span class="s2">"searx.engines.__init__"</span>
<span class="ow">and</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">module</span><span class="p">,</span> <span class="s2">"logger"</span><span class="p">)</span>
<span class="p">):</span>
<span class="n">module_engine_name</span> <span class="o">=</span> <span class="n">module_name</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">"."</span><span class="p">)[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span>
<span class="n">module</span><span class="o">.</span><span class="n">logger</span> <span class="o">=</span> <span class="n">logger</span><span class="o">.</span><span class="n">getChild</span><span class="p">(</span><span class="n">module_engine_name</span><span class="p">)</span> <span class="c1"># type: ignore</span>
<span class="k">def</span> <span class="nf">update_engine_attributes</span><span class="p">(</span><span class="n">engine</span><span class="p">:</span> <span class="n">Engine</span> <span class="o">|</span> <span class="n">types</span><span class="o">.</span><span class="n">ModuleType</span><span class="p">,</span> <span class="n">engine_data</span><span class="p">):</span>
<span class="c1"># set engine attributes from engine_data</span>
<span class="k">for</span> <span class="n">param_name</span><span class="p">,</span> <span class="n">param_value</span> <span class="ow">in</span> <span class="n">engine_data</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="k">if</span> <span class="n">param_name</span> <span class="o">==</span> <span class="s1">'categories'</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">param_value</span><span class="p">,</span> <span class="nb">str</span><span class="p">):</span>
<span class="n">param_value</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="nb">map</span><span class="p">(</span><span class="nb">str</span><span class="o">.</span><span class="n">strip</span><span class="p">,</span> <span class="n">param_value</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">','</span><span class="p">)))</span>
<span class="n">engine</span><span class="o">.</span><span class="n">categories</span> <span class="o">=</span> <span class="n">param_value</span> <span class="c1"># type: ignore</span>
<span class="k">elif</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s1">'about'</span><span class="p">)</span> <span class="ow">and</span> <span class="n">param_name</span> <span class="o">==</span> <span class="s1">'about'</span><span class="p">:</span>
<span class="n">engine</span><span class="o">.</span><span class="n">about</span> <span class="o">=</span> <span class="p">{</span><span class="o">**</span><span class="n">engine</span><span class="o">.</span><span class="n">about</span><span class="p">,</span> <span class="o">**</span><span class="n">engine_data</span><span class="p">[</span><span class="s1">'about'</span><span class="p">]}</span> <span class="c1"># type: ignore</span>
<span class="k">else</span><span class="p">:</span>
<span class="nb">setattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">param_name</span><span class="p">,</span> <span class="n">param_value</span><span class="p">)</span>
<span class="c1"># set default attributes</span>
<span class="k">for</span> <span class="n">arg_name</span><span class="p">,</span> <span class="n">arg_value</span> <span class="ow">in</span> <span class="n">ENGINE_DEFAULT_ARGS</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">arg_name</span><span class="p">):</span>
<span class="nb">setattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">arg_name</span><span class="p">,</span> <span class="n">copy</span><span class="o">.</span><span class="n">deepcopy</span><span class="p">(</span><span class="n">arg_value</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">update_attributes_for_tor</span><span class="p">(</span><span class="n">engine</span><span class="p">:</span> <span class="n">Engine</span> <span class="o">|</span> <span class="n">types</span><span class="o">.</span><span class="n">ModuleType</span><span class="p">):</span>
<span class="k">if</span> <span class="n">using_tor_proxy</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s1">'onion_url'</span><span class="p">):</span>
<span class="n">engine</span><span class="o">.</span><span class="n">search_url</span> <span class="o">=</span> <span class="n">engine</span><span class="o">.</span><span class="n">onion_url</span> <span class="o">+</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s1">'search_path'</span><span class="p">,</span> <span class="s1">''</span><span class="p">)</span> <span class="c1"># type: ignore</span>
<span class="n">engine</span><span class="o">.</span><span class="n">timeout</span> <span class="o">+=</span> <span class="n">settings</span><span class="p">[</span><span class="s1">'outgoing'</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'extra_proxy_timeout'</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> <span class="c1"># type: ignore</span>
<div class="viewcode-block" id="is_missing_required_attributes">
<a class="viewcode-back" href="../../dev/engines/engines.html#searx.engines.is_missing_required_attributes">[docs]</a>
<span class="k">def</span> <span class="nf">is_missing_required_attributes</span><span class="p">(</span><span class="n">engine</span><span class="p">):</span>
<span class="w"> </span><span class="sd">"""An attribute is required when its name doesn't start with ``_`` (underline).</span>
<span class="sd"> Required attributes must not be ``None``.</span>
<span class="sd"> """</span>
<span class="n">missing</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">for</span> <span class="n">engine_attr</span> <span class="ow">in</span> <span class="nb">dir</span><span class="p">(</span><span class="n">engine</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">engine_attr</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s1">'_'</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">engine_attr</span><span class="p">)</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">'Missing engine config attribute: "</span><span class="si">{0}</span><span class="s1">.</span><span class="si">{1}</span><span class="s1">"'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">engine_attr</span><span class="p">))</span>
<span class="n">missing</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">return</span> <span class="n">missing</span></div>
<div class="viewcode-block" id="using_tor_proxy">
<a class="viewcode-back" href="../../dev/engines/engines.html#searx.engines.using_tor_proxy">[docs]</a>
<span class="k">def</span> <span class="nf">using_tor_proxy</span><span class="p">(</span><span class="n">engine</span><span class="p">:</span> <span class="n">Engine</span> <span class="o">|</span> <span class="n">types</span><span class="o">.</span><span class="n">ModuleType</span><span class="p">):</span>
<span class="w"> </span><span class="sd">"""Return True if the engine configuration declares to use Tor."""</span>
<span class="k">return</span> <span class="n">settings</span><span class="p">[</span><span class="s1">'outgoing'</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'using_tor_proxy'</span><span class="p">)</span> <span class="ow">or</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s1">'using_tor_proxy'</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span></div>
<span class="k">def</span> <span class="nf">is_engine_active</span><span class="p">(</span><span class="n">engine</span><span class="p">:</span> <span class="n">Engine</span> <span class="o">|</span> <span class="n">types</span><span class="o">.</span><span class="n">ModuleType</span><span class="p">):</span>
<span class="c1"># check if engine is inactive</span>
<span class="k">if</span> <span class="n">engine</span><span class="o">.</span><span class="n">inactive</span> <span class="ow">is</span> <span class="kc">True</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">False</span>
<span class="c1"># exclude onion engines if not using tor</span>
<span class="k">if</span> <span class="s1">'onions'</span> <span class="ow">in</span> <span class="n">engine</span><span class="o">.</span><span class="n">categories</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">using_tor_proxy</span><span class="p">(</span><span class="n">engine</span><span class="p">):</span>
<span class="k">return</span> <span class="kc">False</span>
<span class="k">return</span> <span class="kc">True</span>
<span class="k">def</span> <span class="nf">register_engine</span><span class="p">(</span><span class="n">engine</span><span class="p">:</span> <span class="n">Engine</span> <span class="o">|</span> <span class="n">types</span><span class="o">.</span><span class="n">ModuleType</span><span class="p">):</span>
<span class="k">if</span> <span class="n">engine</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">engines</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">'Engine config error: ambiguous name: </span><span class="si">{0}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine</span><span class="o">.</span><span class="n">name</span><span class="p">))</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="n">engines</span><span class="p">[</span><span class="n">engine</span><span class="o">.</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">engine</span>
<span class="k">if</span> <span class="n">engine</span><span class="o">.</span><span class="n">shortcut</span> <span class="ow">in</span> <span class="n">engine_shortcuts</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">'Engine config error: ambiguous shortcut: </span><span class="si">{0}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine</span><span class="o">.</span><span class="n">shortcut</span><span class="p">))</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="n">engine_shortcuts</span><span class="p">[</span><span class="n">engine</span><span class="o">.</span><span class="n">shortcut</span><span class="p">]</span> <span class="o">=</span> <span class="n">engine</span><span class="o">.</span><span class="n">name</span>
<span class="k">for</span> <span class="n">category_name</span> <span class="ow">in</span> <span class="n">engine</span><span class="o">.</span><span class="n">categories</span><span class="p">:</span>
<span class="n">categories</span><span class="o">.</span><span class="n">setdefault</span><span class="p">(</span><span class="n">category_name</span><span class="p">,</span> <span class="p">[])</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<div class="viewcode-block" id="load_engines">
<a class="viewcode-back" href="../../dev/engines/engines.html#searx.engines.load_engines">[docs]</a>
<span class="k">def</span> <span class="nf">load_engines</span><span class="p">(</span><span class="n">engine_list</span><span class="p">):</span>
<span class="w"> </span><span class="sd">"""usage: ``engine_list = settings['engines']``"""</span>
<span class="n">engines</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span>
<span class="n">engine_shortcuts</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span>
<span class="n">categories</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span>
<span class="n">categories</span><span class="p">[</span><span class="s1">'general'</span><span class="p">]</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">engine_data</span> <span class="ow">in</span> <span class="n">engine_list</span><span class="p">:</span>
<span class="n">engine</span> <span class="o">=</span> <span class="n">load_engine</span><span class="p">(</span><span class="n">engine_data</span><span class="p">)</span>
<span class="k">if</span> <span class="n">engine</span><span class="p">:</span>
<span class="n">register_engine</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<span class="k">return</span> <span class="n">engines</span></div>
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