266 lines
10 KiB
ReStructuredText
266 lines
10 KiB
ReStructuredText
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.. _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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searx 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 searx and the external search
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engines. Adapters are stored under the folder :origin:`searx/engines`.
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.. contents::
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:depth: 3
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:backlinks: entry
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general engine configuration
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============================
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It is required to tell searx 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
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(normally ``settings.yml``). The arguments in the settings file override
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the ones in the engine file.
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It does not matter if an option is stored in the engine file or in the
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settings. However, the standard way is the following:
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engine file
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-----------
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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 multible pages
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language_support boolean support language choosing
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time_range_support boolean support search time range
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offline boolean engine runs offline
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======================= =========== ===========================================
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settings.yml
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------------
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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 searx-engine
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(filename without ``.py``)
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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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======================= =========== ===========================================
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overrides
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---------
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A few of the options have default values in the engine, but are often
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overwritten by the settings. If ``None`` is assigned to an option in the engine
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file, it has to be redefined in the settings, otherwise searx will not start
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with that engine.
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The naming of overrides is arbitrary. But the recommended overrides are the
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following:
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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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example code
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------------
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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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language_support = True
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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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passed arguments
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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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====================== ============ ========================================================================
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argument type default-value, information
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====================== ============ ========================================================================
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url string ``''``
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method string ``'GET'``
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headers set ``{}``
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data set ``{}``
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cookies set ``{}``
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verify boolean ``True``
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headers.User-Agent string a random User-Agent
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category string current category, like ``'general'``
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started datetime current date-time
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pageno int current pagenumber
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language string specific language code like ``'en_US'``, or ``'all'`` if unspecified
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====================== ============ ========================================================================
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parsed arguments
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----------------
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The function ``def request(query, params):`` always returns the ``params``
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variable. Inside searx, the following paramters can be used to specify a search
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request:
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============ =========== =========================================================
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argument type information
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============ =========== =========================================================
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url string requested url
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method string HTTP request method
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headers set HTTP header information
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data set HTTP data information (parsed if ``method != 'GET'``)
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cookies set HTTP cookies
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verify boolean Performing SSL-Validity check
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============ =========== =========================================================
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example code
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------------
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.. code:: python
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# search-url
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base_url = 'https://example.com/'
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search_string = 'search?{query}&page={page}'
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# do search-request
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def request(query, params):
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search_path = search_string.format(
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query=urlencode({'q': query}),
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page=params['pageno'])
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params['url'] = base_url + search_path
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return params
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returned results
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================
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Searx is able to return results of different media-types. Currently the
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following media-types are supported:
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- default_
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- images_
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- videos_
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- torrent_
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- map_
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To set another media-type as default, the parameter ``template`` must be set to
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the desired type.
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default
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-------
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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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images
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------
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To use this template, the parameter:
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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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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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videos
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------
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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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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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torrent
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-------
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.. _magnetlink: https://en.wikipedia.org/wiki/Magnet_URI_scheme
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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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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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map
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---
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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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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 (http://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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