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https://github.com/searxng/searxng.git
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6e5f22e558
Implementations of the *traits* of the engines.
Engine's traits are fetched from the origin engine and stored in a JSON file in
the *data folder*. Most often traits are languages and region codes and their
mapping from SearXNG's representation to the representation in the origin search
engine.
To load traits from the persistence::
searx.enginelib.traits.EngineTraitsMap.from_data()
For new traits new properties can be added to the class::
searx.enginelib.traits.EngineTraits
.. hint::
Implementation is downward compatible to the deprecated *supported_languages
method* from the vintage implementation.
The vintage code is tagged as *deprecated* an can be removed when all engines
has been ported to the *traits method*.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
387 lines
15 KiB
Python
387 lines
15 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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"""Engine's traits are fetched from the origin engines and stored in a JSON file
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in the *data folder*. Most often traits are languages and region codes and
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their mapping from SearXNG's representation to the representation in the origin
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search engine. For new traits new properties can be added to the class
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:py:class:`EngineTraits`.
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To load traits from the persistence :py:obj:`EngineTraitsMap.from_data` can be
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used.
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"""
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from __future__ import annotations
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import json
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import dataclasses
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from typing import Dict, Union, List, Callable, Optional, TYPE_CHECKING
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from typing_extensions import Literal, Self
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from babel.localedata import locale_identifiers
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from searx import locales
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from searx.data import data_dir, ENGINE_TRAITS
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if TYPE_CHECKING:
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from . import Engine
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class EngineTraitsEncoder(json.JSONEncoder):
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"""Encodes :class:`EngineTraits` to a serializable object, see
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:class:`json.JSONEncoder`."""
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def default(self, o):
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"""Return dictionary of a :class:`EngineTraits` object."""
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if isinstance(o, EngineTraits):
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return o.__dict__
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return super().default(o)
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@dataclasses.dataclass
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class EngineTraits:
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"""The class is intended to be instantiated for each engine."""
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regions: Dict[str, str] = dataclasses.field(default_factory=dict)
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"""Maps SearXNG's internal representation of a region to the one of the engine.
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SearXNG's internal representation can be parsed by babel and the value is
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send to the engine:
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.. code:: python
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regions ={
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'fr-BE' : <engine's region name>,
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}
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for key, egnine_region regions.items():
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searxng_region = babel.Locale.parse(key, sep='-')
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...
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"""
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languages: Dict[str, str] = dataclasses.field(default_factory=dict)
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"""Maps SearXNG's internal representation of a language to the one of the engine.
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SearXNG's internal representation can be parsed by babel and the value is
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send to the engine:
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.. code:: python
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languages = {
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'ca' : <engine's language name>,
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}
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for key, egnine_lang in languages.items():
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searxng_lang = babel.Locale.parse(key)
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...
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"""
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all_locale: Optional[str] = None
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"""To which locale value SearXNG's ``all`` language is mapped (shown a "Default
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language").
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"""
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data_type: Literal['traits_v1', 'supported_languages'] = 'traits_v1'
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"""Data type, default is 'traits_v1' for vintage use 'supported_languages'.
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.. hint::
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For the transition period until the *fetch* functions of all the engines
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are converted there will be the data_type 'supported_languages', which
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maps the old logic unchanged 1:1.
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Instances of data_type 'supported_languages' do not implement methods
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like ``self.get_language(..)`` and ``self.get_region(..)``
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"""
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custom: Dict[str, Dict] = dataclasses.field(default_factory=dict)
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"""A place to store engine's custom traits, not related to the SearXNG core
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"""
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def get_language(self, searxng_locale: str, default=None):
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"""Return engine's language string that *best fits* to SearXNG's locale.
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:param searxng_locale: SearXNG's internal representation of locale
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selected by the user.
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:param default: engine's default language
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The *best fits* rules are implemented in
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:py:obj:`locales.get_engine_locale`. Except for the special value ``all``
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which is determined from :py:obj`EngineTraits.all_language`.
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"""
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if searxng_locale == 'all' and self.all_locale is not None:
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return self.all_locale
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return locales.get_engine_locale(searxng_locale, self.languages, default=default)
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def get_region(self, searxng_locale: str, default=None):
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"""Return engine's region string that best fits to SearXNG's locale.
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:param searxng_locale: SearXNG's internal representation of locale
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selected by the user.
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:param default: engine's default region
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The *best fits* rules are implemented in
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:py:obj:`locales.get_engine_locale`. Except for the special value ``all``
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which is determined from :py:obj`EngineTraits.all_language`.
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"""
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if searxng_locale == 'all' and self.all_locale is not None:
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return self.all_locale
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return locales.get_engine_locale(searxng_locale, self.regions, default=default)
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def is_locale_supported(self, searxng_locale: str) -> bool:
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"""A *locale* (SearXNG's internal representation) is considered to be supported
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by the engine if the *region* or the *language* is supported by the
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engine. For verification the functions :py:func:`self.get_region` and
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:py:func:`self.get_region` are used.
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"""
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if self.data_type == 'traits_v1':
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return bool(self.get_region(searxng_locale) or self.get_language(searxng_locale))
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if self.data_type == 'supported_languages': # vintage / deprecated
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# pylint: disable=import-outside-toplevel
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from searx.utils import match_language
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if searxng_locale == 'all':
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return True
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x = match_language(searxng_locale, self.supported_languages, self.language_aliases, None)
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return bool(x)
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# return bool(self.get_supported_language(searxng_locale))
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raise TypeError('engine traits of type %s is unknown' % self.data_type)
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def copy(self):
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"""Create a copy of the dataclass object."""
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return EngineTraits(**dataclasses.asdict(self))
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@classmethod
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def fetch_traits(cls, engine: Engine) -> Union[Self, None]:
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"""Call a function ``fetch_traits(engine_traits)`` from engines namespace to fetch
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and set properties from the origin engine in the object ``engine_traits``. If
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function does not exists, ``None`` is returned.
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"""
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fetch_traits = getattr(engine, 'fetch_traits', None)
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engine_traits = None
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if fetch_traits:
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engine_traits = cls()
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fetch_traits(engine_traits)
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return engine_traits
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def set_traits(self, engine: Engine):
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"""Set traits from self object in a :py:obj:`.Engine` namespace.
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:param engine: engine instance build by :py:func:`searx.engines.load_engine`
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"""
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if self.data_type == 'traits_v1':
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self._set_traits_v1(engine)
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elif self.data_type == 'supported_languages': # vintage / deprecated
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self._set_supported_languages(engine)
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else:
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raise TypeError('engine traits of type %s is unknown' % self.data_type)
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def _set_traits_v1(self, engine: Engine):
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# For an engine, when there is `language: ...` in the YAML settings the engine
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# does support only this one language (region)::
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#
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# - name: google italian
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# engine: google
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# language: it
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# region: it-IT
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traits = self.copy()
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_msg = "settings.yml - engine: '%s' / %s: '%s' not supported"
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languages = traits.languages
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if hasattr(engine, 'language'):
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if engine.language not in languages:
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raise ValueError(_msg % (engine.name, 'language', engine.language))
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traits.languages = {engine.language: languages[engine.language]}
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regions = traits.regions
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if hasattr(engine, 'region'):
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if engine.region not in regions:
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raise ValueError(_msg % (engine.name, 'region', engine.region))
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traits.regions = {engine.region: regions[engine.region]}
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engine.language_support = bool(traits.languages or traits.regions)
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# set the copied & modified traits in engine's namespace
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engine.traits = traits
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# -------------------------------------------------------------------------
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# The code below is deprecated an can hopefully be deleted at one day
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# -------------------------------------------------------------------------
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supported_languages: Union[List[str], Dict[str, str]] = dataclasses.field(default_factory=dict)
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"""depricated: does not work for engines that do support languages based on a
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region. With this type it is not guaranteed that the key values can be
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parsed by :py:obj:`babel.Locale.parse`!
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"""
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# language_aliases: Dict[str, str] = dataclasses.field(default_factory=dict)
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# """depricated: does not work for engines that do support languages based on a
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# region. With this type it is not guaranteed that the key values can be
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# parsed by :py:obj:`babel.Locale.parse`!
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# """
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BABEL_LANGS = [
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lang_parts[0] + '-' + lang_parts[-1] if len(lang_parts) > 1 else lang_parts[0]
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for lang_parts in (lang_code.split('_') for lang_code in locale_identifiers())
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]
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# def get_supported_language(self, searxng_locale, default=None): # vintage / deprecated
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# """Return engine's language string that *best fits* to SearXNG's locale."""
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# if searxng_locale == 'all' and self.all_locale is not None:
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# return self.all_locale
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# return locales.get_engine_locale(searxng_locale, self.supported_languages, default=default)
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@classmethod # vintage / deprecated
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def fetch_supported_languages(cls, engine: Engine) -> Union[Self, None]:
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"""DEPRECATED: Calls a function ``_fetch_supported_languages`` from engine's
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namespace to fetch languages from the origin engine. If function does
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not exists, ``None`` is returned.
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"""
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# pylint: disable=import-outside-toplevel
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from searx import network
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from searx.utils import gen_useragent
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fetch_languages = getattr(engine, '_fetch_supported_languages', None)
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if fetch_languages is None:
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return None
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# The headers has been moved here from commit 9b6ffed06: Some engines (at
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# least bing and startpage) return a different result list of supported
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# languages depending on the IP location where the HTTP request comes from.
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# The IP based results (from bing) can be avoided by setting a
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# 'Accept-Language' in the HTTP request.
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headers = {
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'User-Agent': gen_useragent(),
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'Accept-Language': "en-US,en;q=0.5", # bing needs to set the English language
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}
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resp = network.get(engine.supported_languages_url, headers=headers)
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supported_languages = fetch_languages(resp)
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if isinstance(supported_languages, list):
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supported_languages.sort()
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engine_traits = cls()
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engine_traits.data_type = 'supported_languages'
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engine_traits.supported_languages = supported_languages
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return engine_traits
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def _set_supported_languages(self, engine: Engine): # vintage / deprecated
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traits = self.copy()
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# pylint: disable=import-outside-toplevel
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from searx.utils import match_language
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_msg = "settings.yml - engine: '%s' / %s: '%s' not supported"
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if hasattr(engine, 'language'):
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if engine.language not in self.supported_languages:
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raise ValueError(_msg % (engine.name, 'language', engine.language))
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if isinstance(self.supported_languages, dict):
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traits.supported_languages = {engine.language: self.supported_languages[engine.language]}
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else:
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traits.supported_languages = [engine.language]
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engine.language_support = bool(traits.supported_languages)
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engine.supported_languages = traits.supported_languages
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# find custom aliases for non standard language codes
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traits.language_aliases = {} # pylint: disable=attribute-defined-outside-init
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for engine_lang in getattr(engine, 'language_aliases', {}):
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iso_lang = match_language(engine_lang, self.BABEL_LANGS, fallback=None)
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if (
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iso_lang
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and iso_lang != engine_lang
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and not engine_lang.startswith(iso_lang)
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and iso_lang not in self.supported_languages
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):
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traits.language_aliases[iso_lang] = engine_lang
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engine.language_aliases = traits.language_aliases
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# set the copied & modified traits in engine's namespace
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engine.traits = traits
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class EngineTraitsMap(Dict[str, EngineTraits]):
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"""A python dictionary to map :class:`EngineTraits` by engine name."""
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ENGINE_TRAITS_FILE = (data_dir / 'engine_traits.json').resolve()
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"""File with persistence of the :py:obj:`EngineTraitsMap`."""
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def save_data(self):
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"""Store EngineTraitsMap in in file :py:obj:`self.ENGINE_TRAITS_FILE`"""
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with open(self.ENGINE_TRAITS_FILE, 'w', encoding='utf-8') as f:
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json.dump(self, f, indent=2, sort_keys=True, cls=EngineTraitsEncoder)
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@classmethod
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def from_data(cls) -> Self:
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"""Instantiate :class:`EngineTraitsMap` object from :py:obj:`ENGINE_TRAITS`"""
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obj = cls()
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for k, v in ENGINE_TRAITS.items():
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obj[k] = EngineTraits(**v)
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return obj
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@classmethod
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def fetch_traits(cls, log: Callable) -> Self:
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from searx import engines # pylint: disable=cyclic-import, import-outside-toplevel
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names = list(engines.engines)
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names.sort()
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obj = cls()
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for engine_name in names:
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engine = engines.engines[engine_name]
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traits = EngineTraits.fetch_traits(engine)
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if traits is not None:
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log("%-20s: SearXNG languages --> %s " % (engine_name, len(traits.languages)))
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log("%-20s: SearXNG regions --> %s" % (engine_name, len(traits.regions)))
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obj[engine_name] = traits
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# vintage / deprecated
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_traits = EngineTraits.fetch_supported_languages(engine)
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if _traits is not None:
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log("%-20s: %s supported_languages (deprecated)" % (engine_name, len(_traits.supported_languages)))
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if traits is not None:
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traits.supported_languages = _traits.supported_languages
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obj[engine_name] = traits
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else:
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obj[engine_name] = _traits
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continue
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return obj
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def set_traits(self, engine: Engine):
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"""Set traits in a :py:obj:`Engine` namespace.
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:param engine: engine instance build by :py:func:`searx.engines.load_engine`
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"""
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engine_traits = EngineTraits(data_type='traits_v1')
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if engine.name in self.keys():
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engine_traits = self[engine.name]
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elif engine.engine in self.keys():
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# The key of the dictionary traits_map is the *engine name*
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# configured in settings.xml. When multiple engines are configured
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# in settings.yml to use the same origin engine (python module)
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# these additional engines can use the languages from the origin
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# engine. For this use the configured ``engine: ...`` from
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# settings.yml
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engine_traits = self[engine.engine]
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engine_traits.set_traits(engine)
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