From 5caebb379f85401709fedf8552c8760f51641a11 Mon Sep 17 00:00:00 2001 From: Markus Heiser Date: Thu, 3 Jun 2021 18:53:00 +0200 Subject: [PATCH] [docs] revision of the article "Engine Overview" This patch revision of the article "Engine Overview": - add links & anchors - improve formating of the tables Signed-off-by: Markus Heiser --- docs/dev/engine_overview.rst | 457 ++++++++++++++++++----------------- 1 file changed, 232 insertions(+), 225 deletions(-) diff --git a/docs/dev/engine_overview.rst b/docs/dev/engine_overview.rst index 2a661ec40..cad92ecb1 100644 --- a/docs/dev/engine_overview.rst +++ b/docs/dev/engine_overview.rst @@ -1,12 +1,20 @@ - .. _engines-dev: =============== -Engine overview +Engine Overview =============== .. _metasearch-engine: https://en.wikipedia.org/wiki/Metasearch_engine +.. sidebar:: Further reading .. + + - :ref:`general engine settings` + - :ref:`settings engine` + +.. contents:: + :depth: 3 + :backlinks: entry + searx is a metasearch-engine_, so it uses different search engines to provide better results. @@ -14,297 +22,296 @@ 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: -general engine configuration +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. +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: +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 +Engine File ----------- -======================= =========== ======================================================== -argument type information -======================= =========== ======================================================== -categories list pages, in which the engine is working -paging boolean support multible pages -time_range_support boolean support search time range -engine_type str ``online`` by default, other possibles values are - ``offline``, ``online_dictionnary``, ``online_currency`` -======================= =========== ======================================================== +.. table:: Common options in the engine module + :width: 100% + + ======================= =========== ======================================================== + argument type information + ======================= =========== ======================================================== + categories list pages, in which the engine is working + paging boolean support multible pages + time_range_support boolean support search time range + engine_type str - ``online`` :ref:`[ref] ` by + default, other possibles values are: + - ``offline`` :ref:`[ref] ` + - ``online_dictionary`` + - ``online_currency`` + ======================= =========== ======================================================== .. _engine settings: -settings.yml ------------- +Engine ``settings.yml`` +----------------------- -======================= =========== ============================================= -argument type information -======================= =========== ============================================= -name string name of search-engine -engine string name of searx-engine - (filename without ``.py``) -enable_http bool enable HTTP - (by default only HTTPS is enabled). -shortcut string shortcut of search-engine -timeout string specific timeout for search-engine -display_error_messages boolean display error messages on the web UI -proxies dict set proxies for a specific engine - (e.g. ``proxies : {http: socks5://proxy:port, - https: socks5://proxy:port}``) -======================= =========== ============================================= +For a more detailed description, see :ref:`settings engine` in the :ref:`settings.yml`. +.. table:: Common options in the engine setup (``settings.yml``) + :width: 100% -overrides + ======================= =========== =============================================== + argument type information + ======================= =========== =============================================== + name string name of search-engine + engine string name of searx-engine (filename without ``.py``) + enable_http bool enable HTTP (by default only HTTPS is enabled). + shortcut string shortcut of search-engine + timeout string specific timeout for search-engine + display_error_messages boolean display error messages on the web UI + proxies dict set proxies for a specific engine + (e.g. ``proxies : {http: socks5://proxy:port, + https: socks5://proxy:port}``) + ======================= =========== =============================================== + +.. _engine overrides: + +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. +.. sidebar:: engine's global names -The naming of overrides is arbitrary. But the recommended overrides are the -following: + Global names with a leading underline are *private to the engine* and will + not be overwritten. -======================= =========== =========================================== -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 -======================= =========== =========================================== +A few of the options have default values in the namespace of engine's python +modul, 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. -example code ------------- +Here is an very simple example of the global names in the namespace of engine's +module: .. code:: python # engine dependent config categories = ['general'] paging = True + _non_overwritten_global = 'foo' +.. table:: The naming of overrides is arbitrary / recommended overrides are: + :width: 100% + + ======================= =========== =========================================== + 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 + ======================= =========== =========================================== + .. _engine request: -making a request +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 ----------------- +.. _engine request arguments: + +Passed Arguments (request) +-------------------------- These arguments can be used to construct the search query. Furthermore, parameters with default value can be redefined for special purposes. -If the ``engine_type`` is ``online```: -====================== ============== ======================================================================== -argument type default-value, information -====================== ============== ======================================================================== -url str ``''`` -method str ``'GET'`` -headers set ``{}`` -data set ``{}`` -cookies set ``{}`` -verify bool ``True`` -headers.User-Agent str a random User-Agent -category str current category, like ``'general'`` -safesearch int ``0``, between ``0`` and ``2`` (normal, moderate, strict) -time_range Optional[str] ``None``, can be ``day``, ``week``, ``month``, ``year`` -pageno int current pagenumber -language str specific language code like ``'en_US'``, or ``'all'`` if unspecified -====================== ============== ======================================================================== +.. table:: If the ``engine_type`` is ``online`` + :width: 100% + + ====================== ============== ======================================================================== + argument type default-value, information + ====================== ============== ======================================================================== + url str ``''`` + method str ``'GET'`` + headers set ``{}`` + data set ``{}`` + cookies set ``{}`` + verify bool ``True`` + headers.User-Agent str a random User-Agent + category str current category, like ``'general'`` + safesearch int ``0``, between ``0`` and ``2`` (normal, moderate, strict) + time_range Optional[str] ``None``, can be ``day``, ``week``, ``month``, ``year`` + pageno int current pagenumber + language str specific language code like ``'en_US'``, or ``'all'`` if unspecified + ====================== ============== ======================================================================== -If the ``engine_type`` is ``online_dictionnary```, in addition to the ``online`` arguments: +.. table:: If the ``engine_type`` is ``online_dictionary``, in addition to the + ``online`` arguments: + :width: 100% -====================== ============ ======================================================================== -argument type default-value, information -====================== ============ ======================================================================== -from_lang str specific language code like ``'en_US'`` -to_lang str specific language code like ``'en_US'`` -query str the text query without the languages -====================== ============ ======================================================================== + ====================== ============== ======================================================================== + argument type default-value, information + ====================== ============== ======================================================================== + from_lang str specific language code like ``'en_US'`` + to_lang str specific language code like ``'en_US'`` + query str the text query without the languages + ====================== ============== ======================================================================== -If the ``engine_type`` is ``online_currency```, in addition to the ``online`` arguments: +.. table:: If the ``engine_type`` is ``online_currency```, in addition to the + ``online`` arguments: + :width: 100% -====================== ============ ======================================================================== -argument type default-value, information -====================== ============ ======================================================================== -amount float the amount to convert -from str ISO 4217 code -to str ISO 4217 code -from_name str currency name -to_name str currency name -====================== ============ ======================================================================== + ====================== ============== ======================================================================== + argument type default-value, information + ====================== ============== ======================================================================== + amount float the amount to convert + from str ISO 4217 code + to str ISO 4217 code + from_name str currency name + to_name str currency name + ====================== ============== ======================================================================== -parsed arguments ----------------- +Specify Request +--------------- -The function ``def request(query, params):`` always returns the ``params`` -variable. Inside searx, the following paramters can be used to specify a search -request: +The function :py:func:`def request(query, params): +` always returns the ``params`` variable, the +following parameters can be used to specify a search request: -=================== =========== ========================================================================== -argument type information -=================== =========== ========================================================================== -url str requested url -method str HTTP request method -headers set HTTP header information -data set HTTP data information -cookies set HTTP cookies -verify bool Performing SSL-Validity check -allow_redirects bool Follow redirects -max_redirects int maximum redirects, hard limit -soft_max_redirects int maximum redirects, soft limit. Record an error but don't stop the engine -raise_for_httperror bool True by default: raise an exception if the HTTP code of response is >= 300 -=================== =========== ========================================================================== +.. table:: + :width: 100% - -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 + =================== =========== ========================================================================== + argument type information + =================== =========== ========================================================================== + url str requested url + method str HTTP request method + headers set HTTP header information + data set HTTP data information + cookies set HTTP cookies + verify bool Performing SSL-Validity check + allow_redirects bool Follow redirects + max_redirects int maximum redirects, hard limit + soft_max_redirects int maximum redirects, soft limit. Record an error but don't stop the engine + raise_for_httperror bool True by default: raise an exception if the HTTP code of response is >= 300 + =================== =========== ========================================================================== .. _engine results: +.. _engine media types: -returned results -================ +Media Types +=========== -Searx is able to return results of different media-types. Currently the -following media-types are supported: +Each result item of an engine can be of different media-types. Currently the +following media-types are supported. To set another media-type as ``default``, +the parameter ``template`` must be set to the desired type. -- default_ -- images_ -- videos_ -- torrent_ -- map_ +.. table:: Parameter of the **default** media type: + :width: 100% -To set another media-type as default, the parameter ``template`` must be set to -the desired type. + ========================= ===================================================== + 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 + ========================= ===================================================== -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 -========================= ===================================================== +.. table:: Parameter of the **images** media type: + :width: 100% -images ------- + ========================= ===================================================== + 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 + ========================= ===================================================== -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 -========================= ===================================================== +.. table:: Parameter of the **videos** media type: + :width: 100% -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 -------- + ========================= ===================================================== + 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 + ========================= ===================================================== .. _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 -========================= ===================================================== +.. table:: Parameter of the **torrent** media type: + :width: 100% + ========================= ===================================================== + 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 ---- +.. table:: Parameter of the **map** media type: + :width: 100% -========================= ===================================================== -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 (https://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 -========================= ===================================================== + ========================= ===================================================== + result-parameter information + ------------------------- ----------------------------------------------------- + template is set to ``map.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 + 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 (https://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 + ========================= =====================================================