mirror of
https://github.com/searxng/searxng
synced 2024-11-09 01:10:26 +00:00
b6c3cb0bdd
Several changes has been made: - Parallel result merge - Scoring algorithm slightly changed (see result_score()) - Proper Thread locking on global data manipulation
340 lines
12 KiB
Python
340 lines
12 KiB
Python
'''
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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 threading
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import searx.poolrequests as requests_lib
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from time import time
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from searx import settings
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from searx.engines import (
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categories, engines
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)
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from searx.languages import language_codes
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from searx.utils import gen_useragent, get_blocked_engines
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from searx.query import Query
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from searx.results import ResultContainer
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from searx import logger
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logger = logger.getChild('search')
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number_of_searches = 0
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def search_request_wrapper(fn, url, engine_name, **kwargs):
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try:
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return fn(url, **kwargs)
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except:
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# increase errors stats
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with threading.RLock():
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engines[engine_name].stats['errors'] += 1
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# print engine name and specific error message
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logger.exception('engine crash: {0}'.format(engine_name))
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return
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def threaded_requests(requests):
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timeout_limit = max(r[2]['timeout'] for r in requests)
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search_start = time()
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for fn, url, request_args, engine_name in requests:
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request_args['timeout'] = timeout_limit
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th = threading.Thread(
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target=search_request_wrapper,
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args=(fn, url, engine_name),
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kwargs=request_args,
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name='search_request',
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)
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th._engine_name = engine_name
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th.start()
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for th in threading.enumerate():
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if th.name == 'search_request':
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remaining_time = max(0.0, timeout_limit - (time() - search_start))
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th.join(remaining_time)
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if th.isAlive():
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logger.warning('engine timeout: {0}'.format(th._engine_name))
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# get default reqest parameter
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def default_request_params():
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return {
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'method': 'GET',
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'headers': {},
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'data': {},
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'url': '',
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'cookies': {},
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'verify': True
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}
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# create a callback wrapper for the search engine results
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def make_callback(engine_name, callback, params, result_container):
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# creating a callback wrapper for the search engine results
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def process_callback(response, **kwargs):
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# check if redirect comparing to the True value,
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# because resp can be a Mock object, and any attribut name returns something.
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if response.is_redirect is True:
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logger.debug('{0} redirect on: {1}'.format(engine_name, response))
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return
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response.search_params = params
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search_duration = time() - params['started']
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# update stats with current page-load-time
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with threading.RLock():
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engines[engine_name].stats['page_load_time'] += search_duration
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timeout_overhead = 0.2 # seconds
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timeout_limit = engines[engine_name].timeout + timeout_overhead
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if search_duration > timeout_limit:
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with threading.RLock():
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engines[engine_name].stats['errors'] += 1
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return
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# callback
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search_results = callback(response)
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# add results
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for result in search_results:
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result['engine'] = engine_name
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result_container.extend(engine_name, search_results)
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return process_callback
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class Search(object):
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"""Search information container"""
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def __init__(self, request):
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# init vars
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super(Search, self).__init__()
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self.query = None
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self.engines = []
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self.categories = []
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self.paging = False
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self.pageno = 1
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self.lang = 'all'
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# set blocked engines
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self.blocked_engines = get_blocked_engines(engines, request.cookies)
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self.result_container = ResultContainer()
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self.request_data = {}
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# set specific language if set
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if request.cookies.get('language')\
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and request.cookies['language'] in (x[0] for x in language_codes):
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self.lang = request.cookies['language']
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# set request method
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if request.method == 'POST':
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self.request_data = request.form
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else:
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self.request_data = request.args
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# TODO better exceptions
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if not self.request_data.get('q'):
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raise Exception('noquery')
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# set pagenumber
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pageno_param = self.request_data.get('pageno', '1')
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if not pageno_param.isdigit() or int(pageno_param) < 1:
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raise Exception('wrong pagenumber')
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self.pageno = int(pageno_param)
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# parse query, if tags are set, which change
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# the serch engine or search-language
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query_obj = Query(self.request_data['q'], self.blocked_engines)
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query_obj.parse_query()
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# set query
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self.query = query_obj.getSearchQuery()
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# get last selected language in query, if possible
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# TODO support search with multible languages
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if len(query_obj.languages):
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self.lang = query_obj.languages[-1]
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self.engines = query_obj.engines
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self.categories = []
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# if engines are calculated from query,
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# set categories by using that informations
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if self.engines and query_obj.specific:
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self.categories = list(set(engine['category']
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for engine in self.engines))
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# otherwise, using defined categories to
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# calculate which engines should be used
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else:
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# set categories/engines
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load_default_categories = True
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for pd_name, pd in self.request_data.items():
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if pd_name == 'categories':
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self.categories.extend(categ for categ in map(unicode.strip, pd.split(',')) if categ in categories)
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elif pd_name == 'engines':
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pd_engines = [{'category': engines[engine].categories[0],
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'name': engine}
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for engine in map(unicode.strip, pd.split(',')) if engine in engines]
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if pd_engines:
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self.engines.extend(pd_engines)
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load_default_categories = False
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elif pd_name.startswith('category_'):
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category = pd_name[9:]
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# if category is not found in list, skip
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if category not in categories:
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continue
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if pd != 'off':
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# add category to list
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self.categories.append(category)
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elif category in self.categories:
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# remove category from list if property is set to 'off'
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self.categories.remove(category)
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if not load_default_categories:
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if not self.categories:
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self.categories = list(set(engine['category']
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for engine in self.engines))
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return
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# if no category is specified for this search,
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# using user-defined default-configuration which
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# (is stored in cookie)
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if not self.categories:
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cookie_categories = request.cookies.get('categories', '')
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cookie_categories = cookie_categories.split(',')
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for ccateg in cookie_categories:
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if ccateg in categories:
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self.categories.append(ccateg)
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# if still no category is specified, using general
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# as default-category
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if not self.categories:
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self.categories = ['general']
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# using all engines for that search, which are
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# declared under the specific categories
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for categ in self.categories:
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self.engines.extend({'category': categ,
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'name': engine.name}
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for engine in categories[categ]
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if (engine.name, categ) not in self.blocked_engines)
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# do search-request
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def search(self, request):
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global number_of_searches
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# init vars
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requests = []
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# increase number of searches
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number_of_searches += 1
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# set default useragent
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# user_agent = request.headers.get('User-Agent', '')
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user_agent = gen_useragent()
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# start search-reqest for all selected engines
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for selected_engine in self.engines:
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if selected_engine['name'] not in engines:
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continue
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engine = engines[selected_engine['name']]
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# if paging is not supported, skip
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if self.pageno > 1 and not engine.paging:
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continue
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# if search-language is set and engine does not
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# provide language-support, skip
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if self.lang != 'all' and not engine.language_support:
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continue
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# set default request parameters
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request_params = default_request_params()
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request_params['headers']['User-Agent'] = user_agent
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request_params['category'] = selected_engine['category']
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request_params['started'] = time()
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request_params['pageno'] = self.pageno
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if hasattr(engine, 'language') and engine.language:
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request_params['language'] = engine.language
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else:
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request_params['language'] = self.lang
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try:
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# 0 = None, 1 = Moderate, 2 = Strict
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request_params['safesearch'] = int(request.cookies.get('safesearch'))
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except Exception:
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request_params['safesearch'] = settings['search']['safe_search']
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# update request parameters dependent on
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# search-engine (contained in engines folder)
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engine.request(self.query.encode('utf-8'), request_params)
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if request_params['url'] is None:
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# TODO add support of offline engines
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pass
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# create a callback wrapper for the search engine results
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callback = make_callback(
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selected_engine['name'],
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engine.response,
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request_params,
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self.result_container)
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# create dictionary which contain all
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# informations about the request
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request_args = dict(
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headers=request_params['headers'],
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hooks=dict(response=callback),
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cookies=request_params['cookies'],
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timeout=engine.timeout,
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verify=request_params['verify']
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)
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# specific type of request (GET or POST)
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if request_params['method'] == 'GET':
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req = requests_lib.get
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else:
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req = requests_lib.post
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request_args['data'] = request_params['data']
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# ignoring empty urls
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if not request_params['url']:
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continue
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# append request to list
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requests.append((req, request_params['url'],
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request_args,
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selected_engine['name']))
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if not requests:
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return self
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# send all search-request
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threaded_requests(requests)
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# return results, suggestions, answers and infoboxes
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return self
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