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# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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# pylint: disable=missing-function-docstring
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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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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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"""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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return engine
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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 param_name != 'engine':
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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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# pylint: disable=protected-access
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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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# 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 (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': 'ja-JP,ja;q=0.8,en-US;q=0.5,en;q=0.3', # bing needs a non-English language
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}
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engine.fetch_supported_languages = (
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lambda: engine._fetch_supported_languages(
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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')
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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(
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'Missing engine config attribute: "{0}.{1}"'
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.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
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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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"""
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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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