forked from zaclys/searxng
381 lines
13 KiB
Python
381 lines
13 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 gc
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import threading
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from thread import start_new_thread
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from time import time
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from uuid import uuid4
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import searx.poolrequests as requests_lib
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from searx.engines import (
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categories, engines
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)
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from searx.utils import gen_useragent
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from searx.query import RawTextQuery, SearchQuery
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from searx.results import ResultContainer
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from searx import logger
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from searx.plugins import plugins
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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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ret = None
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engine = engines[engine_name]
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try:
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ret = fn(url, **kwargs)
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with threading.RLock():
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engine.continuous_errors = 0
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engine.suspend_end_time = 0
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except:
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# increase errors stats
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with threading.RLock():
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engine.stats['errors'] += 1
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engine.continuous_errors += 1
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engine.suspend_end_time = time() + min(60, engine.continuous_errors)
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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 ret
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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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search_id = uuid4().__str__()
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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_id,
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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_id:
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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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def get_search_query_from_webapp(preferences, form):
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query = None
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query_engines = []
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query_categories = []
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query_paging = False
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query_pageno = 1
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query_lang = 'all'
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query_time_range = None
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# set blocked engines
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disabled_engines = preferences.engines.get_disabled()
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# set specific language if set
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query_lang = preferences.get_value('language')
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# safesearch
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query_safesearch = preferences.get_value('safesearch')
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# TODO better exceptions
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if not form.get('q'):
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raise Exception('noquery')
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# set pagenumber
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pageno_param = form.get('pageno', '1')
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if not pageno_param.isdigit() or int(pageno_param) < 1:
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pageno_param = 1
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query_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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raw_text_query = RawTextQuery(form['q'], disabled_engines)
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raw_text_query.parse_query()
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# set query
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query = raw_text_query.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(raw_text_query.languages):
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query_lang = raw_text_query.languages[-1]
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query_time_range = form.get('time_range')
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query_engines = raw_text_query.engines
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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 query_engines and raw_text_query.specific:
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query_categories = list(set(engine['category']
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for engine in query_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 form.items():
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if pd_name == 'categories':
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query_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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query_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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query_categories.append(category)
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elif category in query_categories:
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# remove category from list if property is set to 'off'
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query_categories.remove(category)
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if not load_default_categories:
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if not query_categories:
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query_categories = list(set(engine['category']
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for engine in engines))
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else:
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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 query_categories:
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cookie_categories = preferences.get_value('categories')
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for ccateg in cookie_categories:
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if ccateg in categories:
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query_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 query_categories:
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query_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 query_categories:
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query_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 disabled_engines)
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return SearchQuery(query, query_engines, query_categories,
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query_lang, query_safesearch, query_pageno, query_time_range)
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class Search(object):
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"""Search information container"""
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def __init__(self, search_query):
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# init vars
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super(Search, self).__init__()
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self.search_query = search_query
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self.result_container = ResultContainer()
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# do search-request
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def search(self):
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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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search_query = self.search_query
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# start search-reqest for all selected engines
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for selected_engine in search_query.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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# skip suspended engines
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if engine.suspend_end_time >= time():
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logger.debug('Engine currently suspended: %s', selected_engine['name'])
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continue
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# if paging is not supported, skip
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if search_query.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 search_query.lang != 'all' and not engine.language_support:
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continue
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# if time_range is not supported, skip
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if search_query.time_range and not engine.time_range_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'] = search_query.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'] = search_query.lang
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# 0 = None, 1 = Moderate, 2 = Strict
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request_params['safesearch'] = search_query.safesearch
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request_params['time_range'] = search_query.time_range
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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(search_query.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.result_container
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# send all search-request
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threaded_requests(requests)
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start_new_thread(gc.collect, tuple())
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# return results, suggestions, answers and infoboxes
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return self.result_container
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class SearchWithPlugins(Search):
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"""Similar to the Search class but call the plugins."""
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def __init__(self, search_query, request):
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super(SearchWithPlugins, self).__init__(search_query)
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self.request = request
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def search(self):
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if plugins.call('pre_search', self.request, self):
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super(SearchWithPlugins, self).search()
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plugins.call('post_search', self.request, self)
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results = self.result_container.get_ordered_results()
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for result in results:
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plugins.call('on_result', self.request, self, result)
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return self.result_container
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