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diff --git a/docs/dev/engine_overview.rst b/docs/dev/engine_overview.rst new file mode 100644 index 000000000..449c837a9 --- /dev/null +++ b/docs/dev/engine_overview.rst @@ -0,0 +1,267 @@ + +.. _engines-dev: + +=============== +Engine overview +=============== + +.. _metasearch-engine: https://en.wikipedia.org/wiki/Metasearch_engine + +searx is a metasearch-engine_, so it uses different search engines to provide +better results. + +Because there is no general search API which could be used for every search +engine, an adapter has to be built between searx and the external search +engines. Adapters are stored under the folder :origin:`searx/engines`. + +.. contents:: + :depth: 3 + :backlinks: entry + +general engine configuration +============================ + +It is required to tell searx the type of results the engine provides. The +arguments can be set in the engine file or in the settings file +(normally ``settings.yml``). The arguments in the settings file override +the ones in the engine file. + +It does not matter if an option is stored in the engine file or in the +settings. However, the standard way is the following: + +.. _engine file: + +engine file +----------- + +======================= =========== =========================================== +argument type information +======================= =========== =========================================== +categories list pages, in which the engine is working +paging boolean support multible pages +language_support boolean support language choosing +time_range_support boolean support search time range +offline boolean engine runs offline +======================= =========== =========================================== + +.. _engine settings: + +settings.yml +------------ + +======================= =========== =========================================== +argument type information +======================= =========== =========================================== +name string name of search-engine +engine string name of searx-engine + (filename without ``.py``) +shortcut string shortcut of search-engine +timeout string specific timeout for search-engine +======================= =========== =========================================== + + +overrides +--------- + +A few of the options have default values in the engine, but are often +overwritten by the settings. If ``None`` is assigned to an option in the engine +file, it has to be redefined in the settings, otherwise searx will not start +with that engine. + +The naming of overrides is arbitrary. But the recommended overrides are the +following: + +======================= =========== =========================================== +argument type information +======================= =========== =========================================== +base_url string base-url, can be overwritten to use same + engine on other URL +number_of_results int maximum number of results per request +language string ISO code of language and country like en_US +api_key string api-key if required by engine +======================= =========== =========================================== + +example code +------------ + +.. code:: python + + # engine dependent config + categories = ['general'] + paging = True + language_support = True + + +making a request +================ + +To perform a search an URL have to be specified. In addition to specifying an +URL, arguments can be passed to the query. + +passed arguments +---------------- + +These arguments can be used to construct the search query. Furthermore, +parameters with default value can be redefined for special purposes. + +====================== ============ ======================================================================== +argument type default-value, information +====================== ============ ======================================================================== +url string ``''`` +method string ``'GET'`` +headers set ``{}`` +data set ``{}`` +cookies set ``{}`` +verify boolean ``True`` +headers.User-Agent string a random User-Agent +category string current category, like ``'general'`` +started datetime current date-time +pageno int current pagenumber +language string specific language code like ``'en_US'``, or ``'all'`` if unspecified +====================== ============ ======================================================================== + +parsed arguments +---------------- + +The function ``def request(query, params):`` always returns the ``params`` +variable. Inside searx, the following paramters can be used to specify a search +request: + +============ =========== ========================================================= +argument type information +============ =========== ========================================================= +url string requested url +method string HTTP request method +headers set HTTP header information +data set HTTP data information (parsed if ``method != 'GET'``) +cookies set HTTP cookies +verify boolean Performing SSL-Validity check +============ =========== ========================================================= + + +example code +------------ + +.. code:: python + + # search-url + base_url = 'https://example.com/' + search_string = 'search?{query}&page={page}' + + # do search-request + def request(query, params): + search_path = search_string.format( + query=urlencode({'q': query}), + page=params['pageno']) + + params['url'] = base_url + search_path + + return params + + +returned results +================ + +Searx is able to return results of different media-types. Currently the +following media-types are supported: + +- default_ +- images_ +- videos_ +- torrent_ +- map_ + +To set another media-type as default, the parameter ``template`` must be set to +the desired type. + +default +------- + +========================= ===================================================== +result-parameter information +========================= ===================================================== +url string, url of the result +title string, title of the result +content string, general result-text +publishedDate :py:class:`datetime.datetime`, time of publish +========================= ===================================================== + +images +------ + +To use this template, the parameter: + +========================= ===================================================== +result-parameter information +========================= ===================================================== +template is set to ``images.html`` +url string, url to the result site +title string, title of the result *(partly implemented)* +content *(partly implemented)* +publishedDate :py:class:`datetime.datetime`, + time of publish *(partly implemented)* +img\_src string, url to the result image +thumbnail\_src string, url to a small-preview image +========================= ===================================================== + +videos +------ + +========================= ===================================================== +result-parameter information +========================= ===================================================== +template is set to ``videos.html`` +url string, url of the result +title string, title of the result +content *(not implemented yet)* +publishedDate :py:class:`datetime.datetime`, time of publish +thumbnail string, url to a small-preview image +========================= ===================================================== + +torrent +------- + +.. _magnetlink: https://en.wikipedia.org/wiki/Magnet_URI_scheme + +========================= ===================================================== +result-parameter information +========================= ===================================================== +template is set to ``torrent.html`` +url string, url of the result +title string, title of the result +content string, general result-text +publishedDate :py:class:`datetime.datetime`, + time of publish *(not implemented yet)* +seed int, number of seeder +leech int, number of leecher +filesize int, size of file in bytes +files int, number of files +magnetlink string, magnetlink_ of the result +torrentfile string, torrentfile of the result +========================= ===================================================== + + +map +--- + +========================= ===================================================== +result-parameter information +========================= ===================================================== +url string, url of the result +title string, title of the result +content string, general result-text +publishedDate :py:class:`datetime.datetime`, time of publish +latitude latitude of result (in decimal format) +longitude longitude of result (in decimal format) +boundingbox boundingbox of result (array of 4. values + ``[lat-min, lat-max, lon-min, lon-max]``) +geojson geojson of result (http://geojson.org) +osm.type type of osm-object (if OSM-Result) +osm.id id of osm-object (if OSM-Result) +address.name name of object +address.road street name of object +address.house_number house number of object +address.locality city, place of object +address.postcode postcode of object +address.country country of object +========================= ===================================================== |