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403 lines
16 KiB
ReStructuredText
.. _engines-dev:
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===============
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Engine Overview
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===============
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.. _metasearch-engine: https://en.wikipedia.org/wiki/Metasearch_engine
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.. sidebar:: Further reading ..
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- :ref:`configured engines`
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- :ref:`settings engine`
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.. contents::
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:depth: 3
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:backlinks: entry
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SearXNG is a metasearch-engine_, so it uses different search engines to provide
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better results.
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Because there is no general search API which could be used for every search
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engine, an adapter has to be built between SearXNG and the external search
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engines. Adapters are stored under the folder :origin:`searx/engines`.
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.. _general engine configuration:
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General Engine Configuration
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============================
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It is required to tell SearXNG the type of results the engine provides. The
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arguments can be set in the engine file or in the settings file (normally
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``settings.yml``). The arguments in the settings file override the ones in the
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engine file.
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It does not matter if an option is stored in the engine file or in the settings.
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However, the standard way is the following:
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.. _engine file:
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Engine File
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-----------
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.. table:: Common options in the engine module
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:width: 100%
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======================= =========== ========================================================
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argument type information
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======================= =========== ========================================================
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categories list pages, in which the engine is working
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paging boolean support multiple pages
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time_range_support boolean support search time range
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engine_type str - ``online`` :ref:`[ref] <demo online engine>` by
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default, other possibles values are:
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- ``offline`` :ref:`[ref] <offline engines>`
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- ``online_dictionary``
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- ``online_currency``
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======================= =========== ========================================================
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.. _engine settings:
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Engine ``settings.yml``
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-----------------------
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For a more detailed description, see :ref:`settings engine` in the :ref:`settings.yml`.
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.. table:: Common options in the engine setup (``settings.yml``)
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:width: 100%
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======================= =========== ==================================================
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argument type information
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======================= =========== ==================================================
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name string name of search-engine
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engine string name of searxng-engine (file name without ``.py``)
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enable_http bool enable HTTP (by default only HTTPS is enabled).
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shortcut string shortcut of search-engine
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timeout string specific timeout for search-engine
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display_error_messages boolean display error messages on the web UI
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proxies dict set proxies for a specific engine
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(e.g. ``proxies : {http: socks5://proxy:port,
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https: socks5://proxy:port}``)
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======================= =========== ==================================================
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.. _engine overrides:
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Overrides
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---------
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A few of the options have default values in the namespace of engine's python
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modul, but are often overwritten by the settings. If ``None`` is assigned to an
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option in the engine file, it has to be redefined in the settings, otherwise
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SearXNG will not start with that engine (global names with a leading underline can
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be ``None``).
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Here is an very simple example of the global names in the namespace of engine's
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module:
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.. code:: python
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# engine dependent config
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categories = ['general']
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paging = True
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_non_overwritten_global = 'foo'
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.. table:: The naming of overrides is arbitrary / recommended overrides are:
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:width: 100%
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======================= =========== ===========================================
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argument type information
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======================= =========== ===========================================
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base_url string base-url, can be overwritten to use same
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engine on other URL
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number_of_results int maximum number of results per request
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language string ISO code of language and country like en_US
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api_key string api-key if required by engine
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======================= =========== ===========================================
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.. _engine request:
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Making a Request
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================
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To perform a search an URL have to be specified. In addition to specifying an
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URL, arguments can be passed to the query.
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.. _engine request arguments:
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Passed Arguments (request)
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--------------------------
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These arguments can be used to construct the search query. Furthermore,
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parameters with default value can be redefined for special purposes.
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.. table:: If the ``engine_type`` is ``online``
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:width: 100%
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====================== ============== ========================================================================
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argument type default-value, information
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====================== ============== ========================================================================
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url str ``''``
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method str ``'GET'``
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headers set ``{}``
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data set ``{}``
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cookies set ``{}``
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verify bool ``True``
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headers.User-Agent str a random User-Agent
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category str current category, like ``'general'``
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safesearch int ``0``, between ``0`` and ``2`` (normal, moderate, strict)
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time_range Optional[str] ``None``, can be ``day``, ``week``, ``month``, ``year``
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pageno int current pagenumber
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language str specific language code like ``'en_US'``, or ``'all'`` if unspecified
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====================== ============== ========================================================================
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.. table:: If the ``engine_type`` is ``online_dictionary``, in addition to the
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``online`` arguments:
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:width: 100%
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====================== ============== ========================================================================
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argument type default-value, information
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====================== ============== ========================================================================
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from_lang str specific language code like ``'en_US'``
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to_lang str specific language code like ``'en_US'``
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query str the text query without the languages
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====================== ============== ========================================================================
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.. table:: If the ``engine_type`` is ``online_currency```, in addition to the
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``online`` arguments:
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:width: 100%
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====================== ============== ========================================================================
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argument type default-value, information
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====================== ============== ========================================================================
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amount float the amount to convert
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from str ISO 4217 code
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to str ISO 4217 code
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from_name str currency name
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to_name str currency name
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====================== ============== ========================================================================
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Specify Request
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---------------
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The function :py:func:`def request(query, params):
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<searx.engines.demo_online.request>` always returns the ``params`` variable, the
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following parameters can be used to specify a search request:
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.. table::
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:width: 100%
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=================== =========== ==========================================================================
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argument type information
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=================== =========== ==========================================================================
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url str requested url
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method str HTTP request method
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headers set HTTP header information
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data set HTTP data information
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cookies set HTTP cookies
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verify bool Performing SSL-Validity check
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allow_redirects bool Follow redirects
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max_redirects int maximum redirects, hard limit
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soft_max_redirects int maximum redirects, soft limit. Record an error but don't stop the engine
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raise_for_httperror bool True by default: raise an exception if the HTTP code of response is >= 300
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=================== =========== ==========================================================================
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.. _engine results:
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.. _engine media types:
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Media Types
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===========
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Each result item of an engine can be of different media-types. Currently the
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following media-types are supported. To set another media-type as ``default``,
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the parameter ``template`` must be set to the desired type.
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.. table:: Parameter of the **default** media type:
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:width: 100%
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========================= =====================================================
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result-parameter information
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========================= =====================================================
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url string, url of the result
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title string, title of the result
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content string, general result-text
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publishedDate :py:class:`datetime.datetime`, time of publish
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========================= =====================================================
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.. table:: Parameter of the **images** media type:
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:width: 100%
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========================= =====================================================
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result-parameter information
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------------------------- -----------------------------------------------------
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template is set to ``images.html``
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========================= =====================================================
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url string, url to the result site
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title string, title of the result *(partly implemented)*
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content *(partly implemented)*
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publishedDate :py:class:`datetime.datetime`,
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time of publish *(partly implemented)*
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img\_src string, url to the result image
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thumbnail\_src string, url to a small-preview image
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========================= =====================================================
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.. table:: Parameter of the **videos** media type:
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:width: 100%
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========================= =====================================================
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result-parameter information
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------------------------- -----------------------------------------------------
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template is set to ``videos.html``
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========================= =====================================================
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url string, url of the result
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title string, title of the result
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content *(not implemented yet)*
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publishedDate :py:class:`datetime.datetime`, time of publish
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thumbnail string, url to a small-preview image
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========================= =====================================================
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.. _magnetlink: https://en.wikipedia.org/wiki/Magnet_URI_scheme
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.. table:: Parameter of the **torrent** media type:
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:width: 100%
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========================= =====================================================
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result-parameter information
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------------------------- -----------------------------------------------------
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template is set to ``torrent.html``
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========================= =====================================================
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url string, url of the result
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title string, title of the result
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content string, general result-text
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publishedDate :py:class:`datetime.datetime`,
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time of publish *(not implemented yet)*
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seed int, number of seeder
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leech int, number of leecher
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filesize int, size of file in bytes
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files int, number of files
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magnetlink string, magnetlink_ of the result
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torrentfile string, torrentfile of the result
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========================= =====================================================
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.. table:: Parameter of the **map** media type:
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:width: 100%
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========================= =====================================================
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result-parameter information
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------------------------- -----------------------------------------------------
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template is set to ``map.html``
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========================= =====================================================
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url string, url of the result
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title string, title of the result
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content string, general result-text
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publishedDate :py:class:`datetime.datetime`, time of publish
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latitude latitude of result (in decimal format)
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longitude longitude of result (in decimal format)
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boundingbox boundingbox of result (array of 4. values
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``[lat-min, lat-max, lon-min, lon-max]``)
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geojson geojson of result (https://geojson.org/)
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osm.type type of osm-object (if OSM-Result)
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osm.id id of osm-object (if OSM-Result)
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address.name name of object
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address.road street name of object
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address.house_number house number of object
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address.locality city, place of object
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address.postcode postcode of object
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address.country country of object
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========================= =====================================================
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.. _BibTeX format: https://www.bibtex.com/g/bibtex-format/
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.. _BibTeX field types: https://en.wikipedia.org/wiki/BibTeX#Field_types
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.. list-table:: Parameter of the **paper** media type /
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see `BibTeX field types`_ and `BibTeX format`_
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:header-rows: 2
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:width: 100%
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* - result-parameter
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- Python type
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- information
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* - template
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- :py:class:`str`
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- is set to ``paper.html``
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* - title
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- :py:class:`str`
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- title of the result
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* - content
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- :py:class:`str`
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- abstract
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* - comments
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- :py:class:`str`
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- free text display in italic below the content
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* - tags
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- :py:class:`List <list>`\ [\ :py:class:`str`\ ]
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- free tag list
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* - publishedDate
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- :py:class:`datetime <datetime.datetime>`
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- last publication date
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* - type
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- :py:class:`str`
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- short description of medium type, e.g. *book*, *pdf* or *html* ...
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* - authors
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- :py:class:`List <list>`\ [\ :py:class:`str`\ ]
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- list of authors of the work (authors with a "s")
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* - editor
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- :py:class:`str`
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- list of editors of a book
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* - publisher
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- :py:class:`str`
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- name of the publisher
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* - journal
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- :py:class:`str`
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- name of the journal or magazine the article was
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published in
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* - volume
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- :py:class:`str`
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- volume number
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* - pages
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- :py:class:`str`
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- page range where the article is
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* - number
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- :py:class:`str`
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- number of the report or the issue number for a journal article
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* - doi
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- :py:class:`str`
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- DOI number (like ``10.1038/d41586-018-07848-2``)
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* - issn
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- :py:class:`str`
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- ISSN number like ``1476-4687``
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* - isbn
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- :py:class:`str`
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- ISBN number like ``9780201896831``
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* - pdf_url
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- :py:class:`str`
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- URL to the full article, the PDF version
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* - html_url
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- :py:class:`str`
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- URL to full article, HTML version
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