mirror of https://github.com/searx/searx
309 lines
11 KiB
Python
309 lines
11 KiB
Python
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'''
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searx is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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searx is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with searx. If not, see < http://www.gnu.org/licenses/ >.
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(C) 2013- by Adam Tauber, <asciimoo@gmail.com>
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'''
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import sys
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import threading
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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 urllib.parse import urlparse
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from flask_babel import gettext
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from operator import itemgetter
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from searx import settings
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from searx import logger
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from searx.data import ENGINES_LANGUAGES
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from searx.exceptions import SearxEngineResponseException
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from searx.network import get, initialize as initialize_network, set_context_network_name
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from searx.utils import load_module, match_language, get_engine_from_settings, gen_useragent
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logger = logger.getChild('engines')
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engine_dir = dirname(realpath(__file__))
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engines = {}
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categories = {'general': []}
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babel_langs = [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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engine_shortcuts = {}
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engine_default_args = {'paging': False,
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'categories': ['general'],
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'supported_languages': [],
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'safesearch': False,
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'timeout': settings['outgoing']['request_timeout'],
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'shortcut': '-',
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'disabled': False,
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'enable_http': False,
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'suspend_end_time': 0,
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'continuous_errors': 0,
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'time_range_support': False,
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'engine_type': 'online',
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'display_error_messages': True,
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'tokens': []}
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def load_engine(engine_data):
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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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sys.exit(1)
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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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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:
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logger.exception('Cannot load engine "{}"'.format(engine_module))
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return None
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for param_name, param_value in engine_data.items():
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if param_name == 'engine':
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pass
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elif param_name == 'categories':
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if param_value == 'none':
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engine.categories = []
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else:
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engine.categories = list(map(str.strip, param_value.split(',')))
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else:
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setattr(engine, param_name, param_value)
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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, arg_value)
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# checking required variables
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for engine_attr in dir(engine):
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if engine_attr.startswith('_'):
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continue
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if engine_attr == 'inactive' and getattr(engine, engine_attr) is True:
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return None
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if getattr(engine, engine_attr) is None:
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logger.error('Missing engine config attribute: "{0}.{1}"'
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.format(engine.name, engine_attr))
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sys.exit(1)
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# assign supported languages from json file
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if engine_data['name'] in ENGINES_LANGUAGES:
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setattr(engine, 'supported_languages', ENGINES_LANGUAGES[engine_data['name']])
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# find custom aliases for non standard language codes
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if hasattr(engine, 'supported_languages'):
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if hasattr(engine, 'language_aliases'):
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language_aliases = getattr(engine, 'language_aliases')
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else:
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language_aliases = {}
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for engine_lang in getattr(engine, 'supported_languages'):
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iso_lang = match_language(engine_lang, babel_langs, fallback=None)
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if iso_lang and iso_lang != engine_lang and not engine_lang.startswith(iso_lang) and \
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iso_lang not in getattr(engine, 'supported_languages'):
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language_aliases[iso_lang] = engine_lang
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setattr(engine, 'language_aliases', language_aliases)
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# language_support
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setattr(engine, 'language_support', len(getattr(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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setattr(engine, 'fetch_supported_languages',
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lambda: engine._fetch_supported_languages(get(engine.supported_languages_url, headers=headers)))
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engine.stats = {
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'sent_search_count': 0, # sent search
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'search_count': 0, # succesful search
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'result_count': 0,
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'engine_time': 0,
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'engine_time_count': 0,
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'score_count': 0,
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'errors': 0
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}
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engine_type = getattr(engine, 'engine_type', 'online')
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if engine_type != 'offline':
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engine.stats['page_load_time'] = 0
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engine.stats['page_load_count'] = 0
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# tor related settings
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if settings['outgoing'].get('using_tor_proxy'):
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# use onion url if using tor.
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if hasattr(engine, 'onion_url'):
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engine.search_url = engine.onion_url + getattr(engine, 'search_path', '')
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elif 'onions' in engine.categories:
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# exclude onion engines if not using tor.
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return None
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engine.timeout += settings['outgoing'].get('extra_proxy_timeout', 0)
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for category_name in engine.categories:
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categories.setdefault(category_name, []).append(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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return engine
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def to_percentage(stats, maxvalue):
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for engine_stat in stats:
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if maxvalue:
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engine_stat['percentage'] = int(engine_stat['avg'] / maxvalue * 100)
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else:
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engine_stat['percentage'] = 0
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return stats
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def get_engines_stats(preferences):
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# TODO refactor
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pageloads = []
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engine_times = []
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results = []
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scores = []
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errors = []
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scores_per_result = []
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max_pageload = max_engine_times = max_results = max_score = max_errors = max_score_per_result = 0 # noqa
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for engine in engines.values():
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if not preferences.validate_token(engine):
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continue
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if engine.stats['search_count'] == 0:
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continue
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results_num = \
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engine.stats['result_count'] / float(engine.stats['search_count'])
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if engine.stats['engine_time_count'] != 0:
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this_engine_time = engine.stats['engine_time'] / float(engine.stats['engine_time_count']) # noqa
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else:
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this_engine_time = 0
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if results_num:
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score = engine.stats['score_count'] / float(engine.stats['search_count']) # noqa
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score_per_result = score / results_num
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else:
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score = score_per_result = 0.0
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if engine.engine_type != 'offline':
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load_times = 0
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if engine.stats['page_load_count'] != 0:
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load_times = engine.stats['page_load_time'] / float(engine.stats['page_load_count']) # noqa
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max_pageload = max(load_times, max_pageload)
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pageloads.append({'avg': load_times, 'name': engine.name})
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max_engine_times = max(this_engine_time, max_engine_times)
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max_results = max(results_num, max_results)
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max_score = max(score, max_score)
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max_score_per_result = max(score_per_result, max_score_per_result)
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max_errors = max(max_errors, engine.stats['errors'])
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engine_times.append({'avg': this_engine_time, 'name': engine.name})
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results.append({'avg': results_num, 'name': engine.name})
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scores.append({'avg': score, 'name': engine.name})
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errors.append({'avg': engine.stats['errors'], 'name': engine.name})
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scores_per_result.append({
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'avg': score_per_result,
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'name': engine.name
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})
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pageloads = to_percentage(pageloads, max_pageload)
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engine_times = to_percentage(engine_times, max_engine_times)
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results = to_percentage(results, max_results)
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scores = to_percentage(scores, max_score)
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scores_per_result = to_percentage(scores_per_result, max_score_per_result)
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errors = to_percentage(errors, max_errors)
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return [
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(
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gettext('Engine time (sec)'),
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sorted(engine_times, key=itemgetter('avg'))
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),
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(
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gettext('Page loads (sec)'),
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sorted(pageloads, key=itemgetter('avg'))
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),
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(
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gettext('Number of results'),
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sorted(results, key=itemgetter('avg'), reverse=True)
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),
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(
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gettext('Scores'),
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sorted(scores, key=itemgetter('avg'), reverse=True)
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),
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(
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gettext('Scores per result'),
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sorted(scores_per_result, key=itemgetter('avg'), reverse=True)
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),
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(
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gettext('Errors'),
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sorted(errors, key=itemgetter('avg'), reverse=True)
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),
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]
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def load_engines(engine_list):
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global engines, engine_shortcuts
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engines.clear()
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engine_shortcuts.clear()
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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 is not None:
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engines[engine.name] = engine
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return engines
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def initialize_engines(engine_list):
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load_engines(engine_list)
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initialize_network(engine_list, settings['outgoing'])
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def engine_init(engine_name, init_fn):
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try:
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set_context_network_name(engine_name)
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init_fn(get_engine_from_settings(engine_name))
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except SearxEngineResponseException as exc:
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logger.warn('%s engine: Fail to initialize // %s', engine_name, exc)
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except Exception:
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logger.exception('%s engine: Fail to initialize', engine_name)
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else:
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logger.debug('%s engine: Initialized', engine_name)
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for engine_name, engine in engines.items():
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if hasattr(engine, 'init'):
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init_fn = getattr(engine, 'init')
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if init_fn:
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logger.debug('%s engine: Starting background initialization', engine_name)
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threading.Thread(target=engine_init, args=(engine_name, init_fn)).start()
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