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79 lines
2.8 KiB
ReStructuredText
.. _offline engines:
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===============
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Offline Engines
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===============
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.. sidebar:: offline engines
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- :ref:`demo offline engine`
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- :ref:`sql engines`
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- :ref:`engine command`
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- :origin:`Redis <searx/engines/redis_server.py>`
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To extend the functionality of SearXNG, offline engines are going to be
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introduced. An offline engine is an engine which does not need Internet
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connection to perform a search and does not use HTTP to communicate.
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Offline engines can be configured, by adding those to the `engines` list of
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:origin:`settings.yml <searx/settings.yml>`. An example skeleton for offline
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engines can be found in :ref:`demo offline engine` (:origin:`demo_offline.py
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<searx/engines/demo_offline.py>`).
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Programming Interface
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=====================
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:py:func:`init(engine_settings=None) <searx.engines.demo_offline.init>`
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All offline engines can have their own init function to setup the engine before
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accepting requests. The function gets the settings from settings.yml as a
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parameter. This function can be omitted, if there is no need to setup anything
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in advance.
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:py:func:`search(query, params) <searx.engines.demo_offline.searc>`
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Each offline engine has a function named ``search``. This function is
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responsible to perform a search and return the results in a presentable
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format. (Where *presentable* means presentable by the selected result
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template.)
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The return value is a list of results retrieved by the engine.
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Engine representation in ``/config``
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If an engine is offline, the attribute ``offline`` is set to ``True``.
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.. _offline requirements:
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Extra Dependencies
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==================
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If an offline engine depends on an external tool, SearXNG does not install it by
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default. When an administrator configures such engine and starts the instance,
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the process returns an error with the list of missing dependencies. Also,
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required dependencies will be added to the comment/description of the engine, so
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admins can install packages in advance.
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If there is a need to install additional packages in *Python's Virtual
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Environment* of your SearXNG instance you need to switch into the environment
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(:ref:`searxng-src`) first, for this you can use :ref:`searxng.sh`::
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$ sudo utils/searxng.sh instance cmd bash
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(searxng-pyenv)$ pip install ...
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Private engines (Security)
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==========================
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To limit the access to offline engines, if an instance is available publicly,
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administrators can set token(s) for each of the :ref:`private engines`. If a
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query contains a valid token, then SearXNG performs the requested private
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search. If not, requests from an offline engines return errors.
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Acknowledgement
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===============
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This development was sponsored by `Search and Discovery Fund
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<https://nlnet.nl/discovery>`_ of `NLnet Foundation <https://nlnet.nl/>`_ .
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