'''
searx is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
searx is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with searx. If not, see < http://www.gnu.org/licenses/ >.
(C) 2013- by Adam Tauber, <asciimoo@gmail.com>
'''
import sys
import threading
from os.path import realpath, dirname
from babel.localedata import locale_identifiers
from urllib.parse import urlparse
from operator import itemgetter
from searx import settings
from searx import logger
from searx.data import ENGINES_LANGUAGES
from searx.exceptions import SearxEngineResponseException
from searx.network import get, initialize as initialize_network, set_context_network_name
from searx.utils import load_module, match_language, get_engine_from_settings, gen_useragent
logger = logger.getChild('engines')
engine_dir = dirname(realpath(__file__))
engines = {}
categories = {'general': []}
babel_langs = [lang_parts[0] + '-' + lang_parts[-1] if len(lang_parts) > 1 else lang_parts[0]
for lang_parts in (lang_code.split('_') for lang_code in locale_identifiers())]
engine_shortcuts = {}
engine_default_args = {'paging': False,
'categories': ['general'],
'supported_languages': [],
'safesearch': False,
'timeout': settings['outgoing']['request_timeout'],
'shortcut': '-',
'disabled': False,
'enable_http': False,
'time_range_support': False,
'engine_type': 'online',
'display_error_messages': True,
'tokens': []}
def load_engine(engine_data):
engine_name = engine_data['name']
if '_' in engine_name:
logger.error('Engine name contains underscore: "{}"'.format(engine_name))
sys.exit(1)
if engine_name.lower() != engine_name:
logger.warn('Engine name is not lowercase: "{}", converting to lowercase'.format(engine_name))
engine_name = engine_name.lower()
engine_data['name'] = engine_name
engine_module = engine_data['engine']
try:
engine = load_module(engine_module + '.py', engine_dir)
except (SyntaxError, KeyboardInterrupt, SystemExit, SystemError, ImportError, RuntimeError):
logger.exception('Fatal exception in engine "{}"'.format(engine_module))
sys.exit(1)
except:
logger.exception('Cannot load engine "{}"'.format(engine_module))
return None
for param_name, param_value in engine_data.items():
if param_name == 'engine':
pass
elif param_name == 'categories':
if param_value == 'none':
engine.categories = []
else:
engine.categories = list(map(str.strip, param_value.split(',')))
else:
setattr(engine, param_name, param_value)
for arg_name, arg_value in engine_default_args.items():
if not hasattr(engine, arg_name):
setattr(engine, arg_name, arg_value)
# checking required variables
for engine_attr in dir(engine):
if engine_attr.startswith('_'):
continue
if engine_attr == 'inactive' and getattr(engine, engine_attr) is True:
return None
if getattr(engine, engine_attr) is None:
logger.error('Missing engine config attribute: "{0}.{1}"'
.format(engine.name, engine_attr))
sys.exit(1)
# assign supported languages from json file
if engine_data['name'] in ENGINES_LANGUAGES:
setattr(engine, 'supported_languages', ENGINES_LANGUAGES[engine_data['name']])
# find custom aliases for non standard language codes
if hasattr(engine, 'supported_languages'):
if hasattr(engine, 'language_aliases'):
language_aliases = getattr(engine, 'language_aliases')
else:
language_aliases = {}
for engine_lang in getattr(engine, 'supported_languages'):
iso_lang = match_language(engine_lang, babel_langs, fallback=None)
if iso_lang and iso_lang != engine_lang and not engine_lang.startswith(iso_lang) and \
iso_lang not in getattr(engine, 'supported_languages'):
language_aliases[iso_lang] = engine_lang
setattr(engine, 'language_aliases', language_aliases)
# language_support
setattr(engine, 'language_support', len(getattr(engine, 'supported_languages', [])) > 0)
# assign language fetching method if auxiliary method exists
if hasattr(engine, '_fetch_supported_languages'):
headers = {
'User-Agent': gen_useragent(),
'Accept-Language': 'ja-JP,ja;q=0.8,en-US;q=0.5,en;q=0.3', # bing needs a non-English language
}
setattr(engine, 'fetch_supported_languages',
lambda: engine._fetch_supported_languages(get(engine.supported_languages_url, headers=headers)))
# tor related settings
if settings['outgoing'].get('using_tor_proxy'):
# use onion url if using tor.
if hasattr(engine, 'onion_url'):
engine.search_url = engine.onion_url + getattr(engine, 'search_path', '')
elif 'onions' in engine.categories:
# exclude onion engines if not using tor.
return None
engine.timeout += settings['outgoing'].get('extra_proxy_timeout', 0)
for category_name in engine.categories:
categories.setdefault(category_name, []).append(engine)
if engine.shortcut in engine_shortcuts:
logger.error('Engine config error: ambigious shortcut: {0}'.format(engine.shortcut))
sys.exit(1)
engine_shortcuts[engine.shortcut] = engine.name
return engine
def load_engines(engine_list):
global engines, engine_shortcuts
engines.clear()
engine_shortcuts.clear()
for engine_data in engine_list:
engine = load_engine(engine_data)
if engine is not None:
engines[engine.name] = engine
return engines
def initialize_engines(engine_list):
load_engines(engine_list)
initialize_network(engine_list, settings['outgoing'])
def engine_init(engine_name, init_fn):
try:
set_context_network_name(engine_name)
init_fn(get_engine_from_settings(engine_name))
except SearxEngineResponseException as exc:
logger.warn('%s engine: Fail to initialize // %s', engine_name, exc)
except Exception:
logger.exception('%s engine: Fail to initialize', engine_name)
else:
logger.debug('%s engine: Initialized', engine_name)
for engine_name, engine in engines.items():
if hasattr(engine, 'init'):
init_fn = getattr(engine, 'init')
if init_fn:
logger.debug('%s engine: Starting background initialization', engine_name)
threading.Thread(target=engine_init, args=(engine_name, init_fn)).start()
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