mirror of
https://github.com/searxng/searxng.git
synced 2024-11-22 12:10:11 +01:00
a7d02d4101
Run ``make docs.live`` and visit http://0.0.0.0:8000/admin/searx.favicons.html Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
252 lines
8.6 KiB
ReStructuredText
252 lines
8.6 KiB
ReStructuredText
.. _favicons:
|
|
|
|
========
|
|
Favicons
|
|
========
|
|
|
|
.. sidebar:: warning
|
|
|
|
Don't activate the favicons before reading the documentation.
|
|
|
|
.. contents::
|
|
:depth: 2
|
|
:local:
|
|
:backlinks: entry
|
|
|
|
Activating the favicons in SearXNG is very easy, but this **generates a
|
|
significantly higher load** in the client/server communication and increases
|
|
resources needed on the server.
|
|
|
|
To mitigate these disadvantages, various methods have been implemented,
|
|
including a *cache*. The cache must be parameterized according to your own
|
|
requirements and maintained regularly.
|
|
|
|
To activate favicons in SearXNG's result list, set a default
|
|
``favicon_resolver`` in the :ref:`search <settings search>` settings:
|
|
|
|
.. code:: yaml
|
|
|
|
search:
|
|
favicon_resolver: "duckduckgo"
|
|
|
|
By default and without any extensions, SearXNG serves these resolvers:
|
|
|
|
- ``duckduckgo``
|
|
- ``allesedv``
|
|
- ``google``
|
|
- ``yandex``
|
|
|
|
With the above setting favicons are displayed, the user has the option to
|
|
deactivate this feature in his settings. If the user is to have the option of
|
|
selecting from several *resolvers*, a further setting is required / but this
|
|
setting will be discussed :ref:`later <register resolvers>` in this article,
|
|
first we have to setup the favicons cache.
|
|
|
|
Infrastructure
|
|
==============
|
|
|
|
The infrastructure for providing the favicons essentially consists of three
|
|
parts:
|
|
|
|
- :py:obj:`Favicons-Proxy <.favicons.proxy>` (aka *proxy*)
|
|
- :py:obj:`Favicons-Resolvers <.favicons.resolvers>` (aka *resolver*)
|
|
- :py:obj:`Favicons-Cache <.favicons.cache>` (aka *cache*)
|
|
|
|
To protect the privacy of users, the favicons are provided via a *proxy*. This
|
|
*proxy* is automatically activated with the above activation of a *resolver*.
|
|
Additional requests are required to provide the favicons: firstly, the *proxy*
|
|
must process the incoming requests and secondly, the *resolver* must make
|
|
outgoing requests to obtain the favicons from external sources.
|
|
|
|
A *cache* has been developed to massively reduce both, incoming and outgoing
|
|
requests. This *cache* is also activated automatically with the above
|
|
activation of a *resolver*. In its defaults, however, the *cache* is minimal
|
|
and not well suitable for a production environment!
|
|
|
|
.. _favicon cache setup:
|
|
|
|
Setting up the cache
|
|
====================
|
|
|
|
To parameterize the *cache* and more settings of the favicons infrastructure, a
|
|
TOML_ configuration is created in the file ``/etc/searxng/favicons.toml``.
|
|
|
|
.. code:: toml
|
|
|
|
[favicons]
|
|
|
|
cfg_schema = 1 # config's schema version no.
|
|
|
|
[favicons.cache]
|
|
|
|
db_url = "/var/cache/searxng/faviconcache.db" # default: "/tmp/faviconcache.db"
|
|
LIMIT_TOTAL_BYTES = 2147483648 # 2 GB / default: 50 MB
|
|
# HOLD_TIME = 5184000 # 60 days / default: 30 days
|
|
# BLOB_MAX_BYTES = 40960 # 40 KB / default 20 KB
|
|
# MAINTENANCE_MODE = "off" # default: "auto"
|
|
# MAINTENANCE_PERIOD = 600 # 10min / default: 1h
|
|
|
|
:py:obj:`cfg_schema <.FaviconConfig.cfg_schema>`:
|
|
Is required to trigger any processes required for future upgrades / don't
|
|
change it.
|
|
|
|
:py:obj:`cache.db_url <.FaviconCacheConfig.db_url>`:
|
|
The path to the (SQLite_) database file. The default path is in the `/tmp`_
|
|
folder, which is deleted on every reboot and is therefore unsuitable for a
|
|
production environment. The FHS_ provides the folder for the
|
|
application cache
|
|
|
|
The FHS_ provides the folder `/var/cache`_ for the cache of applications, so a
|
|
suitable storage location of SearXNG's caches is folder ``/var/cache/searxng``.
|
|
In container systems, a volume should be mounted for this folder and in a
|
|
standard installation (compare :ref:`create searxng user`), the folder must be
|
|
created and the user under which the SearXNG process is running must be given
|
|
write permission to this folder.
|
|
|
|
.. code:: bash
|
|
|
|
$ sudo mkdir /var/cache/searxng
|
|
$ sudo chown root:searxng /var/cache/searxng/
|
|
$ sudo chmod g+w /var/cache/searxng/
|
|
|
|
:py:obj:`cache.LIMIT_TOTAL_BYTES <.FaviconCacheConfig.LIMIT_TOTAL_BYTES>`:
|
|
Maximum of bytes stored in the cache of all blobs. The limit is only reached
|
|
at each maintenance interval after which the oldest BLOBs are deleted; the
|
|
limit is exceeded during the maintenance period.
|
|
|
|
.. attention::
|
|
|
|
If the maintenance period is too long or maintenance is switched
|
|
off completely, the cache grows uncontrollably.
|
|
|
|
SearXNG hosters can change other parameters of the cache as required:
|
|
|
|
- :py:obj:`cache.HOLD_TIME <.FaviconCacheConfig.HOLD_TIME>`
|
|
- :py:obj:`cache.BLOB_MAX_BYTES <.FaviconCacheConfig.BLOB_MAX_BYTES>`
|
|
|
|
|
|
Maintenance of the cache
|
|
------------------------
|
|
|
|
Regular maintenance of the cache is required! By default, regular maintenance
|
|
is triggered automatically as part of the client requests:
|
|
|
|
- :py:obj:`cache.MAINTENANCE_MODE <.FaviconCacheConfig.MAINTENANCE_MODE>` (default ``auto``)
|
|
- :py:obj:`cache.MAINTENANCE_PERIOD <.FaviconCacheConfig.MAINTENANCE_PERIOD>` (default ``6000`` / 1h)
|
|
|
|
As an alternative to maintenance as part of the client request process, it is
|
|
also possible to carry out maintenance using an external process. For example,
|
|
by creating a :man:`crontab` entry for maintenance:
|
|
|
|
.. code:: bash
|
|
|
|
$ python -m searx.favicons cache maintenance
|
|
|
|
The following command can be used to display the state of the cache:
|
|
|
|
.. code:: bash
|
|
|
|
$ python -m searx.favicons cache state
|
|
|
|
|
|
.. _favicon proxy setup:
|
|
|
|
Proxy configuration
|
|
===================
|
|
|
|
Most of the options of the :py:obj:`Favicons-Proxy <.favicons.proxy>` are
|
|
already set sensibly with settings from the :ref:`settings.yml <searxng
|
|
settings.yml>` and should not normally be adjusted.
|
|
|
|
.. code:: toml
|
|
|
|
[favicons.proxy]
|
|
|
|
max_age = 5184000 # 60 days / default: 7 days (604800 sec)
|
|
|
|
|
|
:py:obj:`max_age <.FaviconProxyConfig.max_age>`:
|
|
The `HTTP Cache-Control max-age`_ response directive indicates that the
|
|
response remains fresh until N seconds after the response is generated. This
|
|
setting therefore determines how long a favicon remains in the client's cache.
|
|
As a rule, in the favicons infrastructure of SearXNG's this setting only
|
|
affects favicons whose byte size exceeds :ref:`BLOB_MAX_BYTES <favicon cache
|
|
setup>` (the other favicons that are already in the cache are embedded as
|
|
`data URL`_ in the :py:obj:`generated HTML <.favicons.proxy.favicon_url>`,
|
|
which can greatly reduce the number of additional requests).
|
|
|
|
.. _register resolvers:
|
|
|
|
Register resolvers
|
|
------------------
|
|
|
|
A :py:obj:`resolver <.favicon.resolvers>` is a function that obtains the favicon
|
|
from an external source. The resolver functions available to the user are
|
|
registered with their fully qualified name (FQN_) in a ``resolver_map``.
|
|
|
|
If no ``resolver_map`` is defined in the ``favicon.toml``, the favicon
|
|
infrastructure of SearXNG generates this ``resolver_map`` automatically
|
|
depending on the ``settings.yml``. SearXNG would automatically generate the
|
|
following TOML configuration from the following YAML configuration:
|
|
|
|
.. code:: yaml
|
|
|
|
search:
|
|
favicon_resolver: "duckduckgo"
|
|
|
|
.. code:: toml
|
|
|
|
[favicons.proxy.resolver_map]
|
|
|
|
"duckduckgo" = "searx.favicons.resolvers.duckduckgo"
|
|
|
|
If this automatism is not desired, then (and only then) a separate
|
|
``resolver_map`` must be created. For example, to give the user two resolvers to
|
|
choose from, the following configuration could be used:
|
|
|
|
.. code:: toml
|
|
|
|
[favicons.proxy.resolver_map]
|
|
|
|
"duckduckgo" = "searx.favicons.resolvers.duckduckgo"
|
|
"allesedv" = "searx.favicons.resolvers.allesedv"
|
|
# "google" = "searx.favicons.resolvers.google"
|
|
# "yandex" = "searx.favicons.resolvers.yandex"
|
|
|
|
.. note::
|
|
|
|
With each resolver, the resource requirement increases significantly.
|
|
|
|
The number of resolvers increases:
|
|
|
|
- the number of incoming/outgoing requests and
|
|
- the number of favicons to be stored in the cache.
|
|
|
|
In the following we list the resolvers available in the core of SearXNG, but via
|
|
the FQN_ it is also possible to implement your own resolvers and integrate them
|
|
into the *proxy*:
|
|
|
|
- :py:obj:`searx.favicons.resolvers.duckduckgo`
|
|
- :py:obj:`searx.favicons.resolvers.allesedv`
|
|
- :py:obj:`searx.favicons.resolvers.google`
|
|
- :py:obj:`searx.favicons.resolvers.yandex`
|
|
|
|
|
|
|
|
.. _SQLite:
|
|
https://www.sqlite.org/
|
|
.. _FHS:
|
|
https://refspecs.linuxfoundation.org/FHS_3.0/fhs/index.html
|
|
.. _`/var/cache`:
|
|
https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch05s05.html
|
|
.. _`/tmp`:
|
|
https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch03s18.html
|
|
.. _TOML:
|
|
https://toml.io/en/
|
|
.. _HTTP Cache-Control max-age:
|
|
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#response_directives
|
|
.. _data URL:
|
|
https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URLs
|
|
.. _FQN: https://en.wikipedia.org/wiki/Fully_qualified_name
|
|
|