mirror of
https://github.com/searxng/searxng.git
synced 2024-05-23 05:48:05 +00:00
ab90e2ac49
Previously we didn't have a good place to put search engines that don't fit into any of the tab categories. This commit automatically puts search engines that don't belong to any tab category in an "other" category, that is only displayed in the user preferences (and not above search results).
293 lines
10 KiB
Python
293 lines
10 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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"""This module implements the engine loader.
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Load and initialize the ``engines``, see :py:func:`load_engines` and register
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:py:obj:`engine_shortcuts`.
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usage::
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load_engines( settings['engines'] )
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"""
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import sys
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import copy
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import itertools
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from os.path import realpath, dirname
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from babel.localedata import locale_identifiers
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from searx import logger, settings
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from searx.data import ENGINES_LANGUAGES
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from searx.network import get
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from searx.utils import load_module, match_language, gen_useragent
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logger = logger.getChild('engines')
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ENGINE_DIR = dirname(realpath(__file__))
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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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ENGINE_DEFAULT_ARGS = {
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"engine_type": "online",
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"inactive": False,
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"disabled": False,
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"timeout": settings["outgoing"]["request_timeout"],
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"shortcut": "-",
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"categories": ["general"],
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"supported_languages": [],
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"language_aliases": {},
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"paging": False,
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"safesearch": False,
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"time_range_support": False,
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"enable_http": False,
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"display_error_messages": True,
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"tokens": [],
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}
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# set automatically when an engine does not have any tab category
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OTHER_CATEGORY = 'other'
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"""Defaults for the namespace of an engine module, see :py:func:`load_engine`"""
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categories = {'general': []}
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engines = {}
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engine_shortcuts = {}
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"""Simple map of registered *shortcuts* to name of the engine (or ``None``).
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::
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engine_shortcuts[engine.shortcut] = engine.name
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"""
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def load_engine(engine_data):
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"""Load engine from ``engine_data``.
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:param dict engine_data: Attributes from YAML ``settings:engines/<engine>``
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:return: initialized namespace of the ``<engine>``.
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1. create a namespace and load module of the ``<engine>``
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2. update namespace with the defaults from :py:obj:`ENGINE_DEFAULT_ARGS`
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3. update namespace with values from ``engine_data``
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If engine *is active*, return namespace of the engine, otherwise return
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``None``.
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This function also returns ``None`` if initialization of the namespace fails
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for one of the following reasons:
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- engine name contains underscore
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- engine name is not lowercase
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- required attribute is not set :py:func:`is_missing_required_attributes`
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"""
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engine_name = engine_data['name']
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if '_' in engine_name:
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logger.error('Engine name contains underscore: "{}"'.format(engine_name))
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return None
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if engine_name.lower() != engine_name:
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logger.warn('Engine name is not lowercase: "{}", converting to lowercase'.format(engine_name))
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engine_name = engine_name.lower()
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engine_data['name'] = engine_name
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# load_module
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engine_module = engine_data['engine']
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try:
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engine = load_module(engine_module + '.py', ENGINE_DIR)
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except (SyntaxError, KeyboardInterrupt, SystemExit, SystemError, ImportError, RuntimeError):
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logger.exception('Fatal exception in engine "{}"'.format(engine_module))
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sys.exit(1)
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except BaseException:
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logger.exception('Cannot load engine "{}"'.format(engine_module))
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return None
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update_engine_attributes(engine, engine_data)
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set_language_attributes(engine)
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update_attributes_for_tor(engine)
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if not is_engine_active(engine):
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return None
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if is_missing_required_attributes(engine):
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return None
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set_loggers(engine, engine_name)
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if not any(cat in settings['categories_as_tabs'] for cat in engine.categories):
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engine.categories.append(OTHER_CATEGORY)
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return engine
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def set_loggers(engine, engine_name):
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# set the logger for engine
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engine.logger = logger.getChild(engine_name)
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# the engine may have load some other engines
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# may sure the logger is initialized
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for module_name, module in sys.modules.items():
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if (
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module_name.startswith("searx.engines")
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and module_name != "searx.engines.__init__"
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and not hasattr(module, "logger")
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):
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module_engine_name = module_name.split(".")[-1]
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module.logger = logger.getChild(module_engine_name)
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def update_engine_attributes(engine, engine_data):
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# set engine attributes from engine_data
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for param_name, param_value in engine_data.items():
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if param_name == 'categories':
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if isinstance(param_value, str):
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param_value = list(map(str.strip, param_value.split(',')))
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engine.categories = param_value
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elif hasattr(engine, 'about') and param_name == 'about':
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engine.about = {**engine.about, **engine_data['about']}
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else:
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setattr(engine, param_name, param_value)
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# set default attributes
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for arg_name, arg_value in ENGINE_DEFAULT_ARGS.items():
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if not hasattr(engine, arg_name):
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setattr(engine, arg_name, copy.deepcopy(arg_value))
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def set_language_attributes(engine):
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# assign supported languages from json file
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if engine.name in ENGINES_LANGUAGES:
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engine.supported_languages = ENGINES_LANGUAGES[engine.name]
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elif engine.engine in ENGINES_LANGUAGES:
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# The key of the dictionary ENGINES_LANGUAGES is the *engine name*
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# configured in settings.xml. When multiple engines are configured in
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# settings.yml to use the same origin engine (python module) these
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# additional engines can use the languages from the origin engine.
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# For this use the configured ``engine: ...`` from settings.yml
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engine.supported_languages = ENGINES_LANGUAGES[engine.engine]
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if hasattr(engine, 'language'):
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# For an engine, when there is `language: ...` in the YAML settings, the
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# engine supports only one language, in this case
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# engine.supported_languages should contains this value defined in
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# settings.yml
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if engine.language not in engine.supported_languages:
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raise ValueError(
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"settings.yml - engine: '%s' / language: '%s' not supported" % (engine.name, engine.language)
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)
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if isinstance(engine.supported_languages, dict):
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engine.supported_languages = {engine.language: engine.supported_languages[engine.language]}
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else:
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engine.supported_languages = [engine.language]
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# find custom aliases for non standard language codes
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for engine_lang in engine.supported_languages:
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iso_lang = match_language(engine_lang, 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 engine.supported_languages
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):
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engine.language_aliases[iso_lang] = engine_lang
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# language_support
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engine.language_support = len(engine.supported_languages) > 0
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# assign language fetching method if auxiliary method exists
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if hasattr(engine, '_fetch_supported_languages'):
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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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engine.fetch_supported_languages = (
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# pylint: disable=protected-access
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lambda: engine._fetch_supported_languages(get(engine.supported_languages_url, headers=headers))
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)
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def update_attributes_for_tor(engine):
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if settings['outgoing'].get('using_tor_proxy') and hasattr(engine, 'onion_url'):
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engine.search_url = engine.onion_url + getattr(engine, 'search_path', '')
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engine.timeout += settings['outgoing'].get('extra_proxy_timeout', 0)
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def is_missing_required_attributes(engine):
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"""An attribute is required when its name doesn't start with ``_`` (underline).
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Required attributes must not be ``None``.
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"""
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missing = False
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for engine_attr in dir(engine):
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if not engine_attr.startswith('_') and getattr(engine, engine_attr) is None:
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logger.error('Missing engine config attribute: "{0}.{1}"'.format(engine.name, engine_attr))
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missing = True
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return missing
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def is_engine_active(engine):
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# check if engine is inactive
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if engine.inactive is True:
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return False
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# exclude onion engines if not using tor
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if 'onions' in engine.categories and not settings['outgoing'].get('using_tor_proxy'):
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return False
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return True
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def register_engine(engine):
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if engine.name in engines:
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logger.error('Engine config error: ambigious name: {0}'.format(engine.name))
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sys.exit(1)
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engines[engine.name] = engine
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if engine.shortcut in engine_shortcuts:
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logger.error('Engine config error: ambigious shortcut: {0}'.format(engine.shortcut))
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sys.exit(1)
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engine_shortcuts[engine.shortcut] = engine.name
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for category_name in engine.categories:
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categories.setdefault(category_name, []).append(engine)
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def load_engines(engine_list):
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"""usage: ``engine_list = settings['engines']``"""
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engines.clear()
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engine_shortcuts.clear()
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categories.clear()
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categories['general'] = []
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for engine_data in engine_list:
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engine = load_engine(engine_data)
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if engine:
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register_engine(engine)
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return engines
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DEFAULT_GROUP_NAME = 'others'
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def group_engines_in_tab(engines): # pylint: disable=redefined-outer-name
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def engine_sort_key(engine):
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return (engine.about.get('language', ''), engine.name)
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def group_sort_key(group):
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return (group[0] == DEFAULT_GROUP_NAME, group[0].lower())
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def get_group(eng):
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non_tab_engines = [c for c in eng.categories if c not in settings['categories_as_tabs'] + [OTHER_CATEGORY]]
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return non_tab_engines[0] if len(non_tab_engines) > 0 else DEFAULT_GROUP_NAME
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return [
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(groupname, sorted(engines, key=engine_sort_key))
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for groupname, engines in sorted(
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((name, list(engines)) for name, engines in itertools.groupby(sorted(engines, key=get_group), get_group)),
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key=group_sort_key,
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)
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]
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