mirror of
https://github.com/searxng/searxng
synced 2024-01-01 18:24:07 +00:00
2dbc0de0cd
* move searx.search.get_search_query_from_webapp to searx.webadapter * move searx.query.SearchQuery to searx.search
443 lines
16 KiB
Python
443 lines
16 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 time import time
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from uuid import uuid4
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from _thread import start_new_thread
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import requests.exceptions
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import searx.poolrequests as requests_lib
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from searx.engines import engines, settings
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from searx.answerers import ask
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from searx.external_bang import get_bang_url
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from searx.utils import gen_useragent
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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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max_request_timeout = settings.get('outgoing', {}).get('max_request_timeout' or None)
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if max_request_timeout is None:
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logger.info('max_request_timeout={0}'.format(max_request_timeout))
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else:
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if isinstance(max_request_timeout, float):
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logger.info('max_request_timeout={0} second(s)'.format(max_request_timeout))
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else:
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logger.critical('outgoing.max_request_timeout if defined has to be float')
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from sys import exit
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exit(1)
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class SearchQuery:
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"""container for all the search parameters (query, language, etc...)"""
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def __init__(self, query, engines, categories, lang, safesearch, pageno, time_range,
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timeout_limit=None, preferences=None, external_bang=None):
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self.query = query
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self.engines = engines
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self.categories = categories
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self.lang = lang
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self.safesearch = safesearch
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self.pageno = pageno
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self.time_range = None if time_range in ('', 'None', None) else time_range
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self.timeout_limit = timeout_limit
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self.preferences = preferences
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self.external_bang = external_bang
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def __str__(self):
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return self.query + ";" + str(self.engines)
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def send_http_request(engine, request_params):
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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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cookies=request_params['cookies'],
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verify=request_params['verify']
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)
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# setting engine based proxies
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if hasattr(engine, 'proxies'):
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request_args['proxies'] = engine.proxies
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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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# send the request
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return req(request_params['url'], **request_args)
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def search_one_http_request(engine, query, request_params):
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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(query, request_params)
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# ignoring empty urls
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if request_params['url'] is None:
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return None
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if not request_params['url']:
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return None
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# send request
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response = send_http_request(engine, request_params)
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# parse the response
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response.search_params = request_params
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return engine.response(response)
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def search_one_http_request_safe(engine_name, query, request_params, result_container, start_time, timeout_limit):
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# set timeout for all HTTP requests
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requests_lib.set_timeout_for_thread(timeout_limit, start_time=start_time)
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# reset the HTTP total time
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requests_lib.reset_time_for_thread()
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#
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engine = engines[engine_name]
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# suppose everything will be alright
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requests_exception = False
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try:
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# send requests and parse the results
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search_results = search_one_http_request(engine, query, request_params)
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# check if the engine accepted the request
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if search_results is not None:
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# yes, so add results
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result_container.extend(engine_name, search_results)
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# update engine time when there is no exception
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engine_time = time() - start_time
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page_load_time = requests_lib.get_time_for_thread()
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result_container.add_timing(engine_name, engine_time, page_load_time)
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with threading.RLock():
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engine.stats['engine_time'] += engine_time
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engine.stats['engine_time_count'] += 1
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# update stats with the total HTTP time
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engine.stats['page_load_time'] += page_load_time
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engine.stats['page_load_count'] += 1
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except Exception as e:
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# Timing
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engine_time = time() - start_time
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page_load_time = requests_lib.get_time_for_thread()
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result_container.add_timing(engine_name, engine_time, page_load_time)
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# Record the errors
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with threading.RLock():
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engine.stats['errors'] += 1
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if (issubclass(e.__class__, requests.exceptions.Timeout)):
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result_container.add_unresponsive_engine(engine_name, 'timeout')
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# requests timeout (connect or read)
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logger.error("engine {0} : HTTP requests timeout"
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"(search duration : {1} s, timeout: {2} s) : {3}"
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.format(engine_name, engine_time, timeout_limit, e.__class__.__name__))
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requests_exception = True
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elif (issubclass(e.__class__, requests.exceptions.RequestException)):
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result_container.add_unresponsive_engine(engine_name, 'request exception')
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# other requests exception
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logger.exception("engine {0} : requests exception"
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"(search duration : {1} s, timeout: {2} s) : {3}"
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.format(engine_name, engine_time, timeout_limit, e))
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requests_exception = True
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else:
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result_container.add_unresponsive_engine(engine_name, 'unexpected crash', str(e))
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# others errors
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logger.exception('engine {0} : exception : {1}'.format(engine_name, e))
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# suspend or not the engine if there are HTTP errors
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with threading.RLock():
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if requests_exception:
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# update continuous_errors / suspend_end_time
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engine.continuous_errors += 1
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engine.suspend_end_time = time() + min(settings['search']['max_ban_time_on_fail'],
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engine.continuous_errors * settings['search']['ban_time_on_fail'])
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else:
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# no HTTP error (perhaps an engine error)
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# anyway, reset the suspend variables
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engine.continuous_errors = 0
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engine.suspend_end_time = 0
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def record_offline_engine_stats_on_error(engine, result_container, start_time):
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engine_time = time() - start_time
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result_container.add_timing(engine.name, engine_time, engine_time)
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with threading.RLock():
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engine.stats['errors'] += 1
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def search_one_offline_request(engine, query, request_params):
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return engine.search(query, request_params)
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def search_one_offline_request_safe(engine_name, query, request_params, result_container, start_time, timeout_limit):
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engine = engines[engine_name]
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try:
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search_results = search_one_offline_request(engine, query, request_params)
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if search_results:
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result_container.extend(engine_name, search_results)
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engine_time = time() - start_time
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result_container.add_timing(engine_name, engine_time, engine_time)
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with threading.RLock():
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engine.stats['engine_time'] += engine_time
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engine.stats['engine_time_count'] += 1
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except ValueError as e:
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record_offline_engine_stats_on_error(engine, result_container, start_time)
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logger.exception('engine {0} : invalid input : {1}'.format(engine_name, e))
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except Exception as e:
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record_offline_engine_stats_on_error(engine, result_container, start_time)
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result_container.add_unresponsive_engine(engine_name, 'unexpected crash', str(e))
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logger.exception('engine {0} : exception : {1}'.format(engine_name, e))
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def search_one_request_safe(engine_name, query, request_params, result_container, start_time, timeout_limit):
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if engines[engine_name].offline:
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return search_one_offline_request_safe(engine_name, query, request_params, result_container, start_time, timeout_limit) # noqa
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return search_one_http_request_safe(engine_name, query, request_params, result_container, start_time, timeout_limit)
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def search_multiple_requests(requests, result_container, start_time, timeout_limit):
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search_id = uuid4().__str__()
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for engine_name, query, request_params in requests:
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th = threading.Thread(
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target=search_one_request_safe,
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args=(engine_name, query, request_params, result_container, start_time, timeout_limit),
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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() - start_time))
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th.join(remaining_time)
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if th.is_alive():
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result_container.add_unresponsive_engine(th._engine_name, 'timeout')
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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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class Search:
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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().__init__()
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self.search_query = search_query
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self.result_container = ResultContainer()
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self.start_time = None
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self.actual_timeout = None
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def search_external_bang(self):
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"""
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Check if there is a external bang.
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If yes, update self.result_container and return True
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"""
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if self.search_query.external_bang:
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self.result_container.redirect_url = get_bang_url(self.search_query)
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# This means there was a valid bang and the
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# rest of the search does not need to be continued
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if isinstance(self.result_container.redirect_url, str):
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return True
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return False
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def search_answerers(self):
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"""
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Check if an answer return a result.
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If yes, update self.result_container and return True
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"""
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answerers_results = ask(self.search_query)
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if answerers_results:
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for results in answerers_results:
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self.result_container.extend('answer', results)
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return True
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return False
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def _is_accepted(self, engine_name, engine):
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if not self.search_query.preferences.validate_token(engine):
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return False
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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', engine_name)
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return False
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# if paging is not supported, skip
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if self.search_query.pageno > 1 and not engine.paging:
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return False
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# if time_range is not supported, skip
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if self.search_query.time_range and not engine.time_range_support:
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return False
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return True
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def _get_params(self, selected_engine, user_agent):
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if selected_engine['name'] not in engines:
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return None, None
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engine = engines[selected_engine['name']]
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if not self._is_accepted(selected_engine['name'], engine):
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return None, None
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# set default request parameters
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request_params = {}
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if not engine.offline:
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request_params = default_request_params()
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request_params['headers']['User-Agent'] = user_agent
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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.search_query.lang
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request_params['safesearch'] = self.search_query.safesearch
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request_params['time_range'] = self.search_query.time_range
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request_params['category'] = selected_engine['category']
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request_params['pageno'] = self.search_query.pageno
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return request_params, engine.timeout
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# do search-request
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def _get_requests(self):
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global number_of_searches
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# init vars
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requests = []
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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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# max of all selected engine timeout
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default_timeout = 0
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# start search-reqest for all selected engines
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for selected_engine in self.search_query.engines:
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# set default request parameters
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request_params, engine_timeout = self._get_params(selected_engine, user_agent)
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if request_params is None:
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continue
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# append request to list
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requests.append((selected_engine['name'], self.search_query.query, request_params))
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# update default_timeout
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default_timeout = max(default_timeout, engine_timeout)
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# adjust timeout
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actual_timeout = default_timeout
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query_timeout = self.search_query.timeout_limit
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if max_request_timeout is None and query_timeout is None:
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# No max, no user query: default_timeout
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pass
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elif max_request_timeout is None and query_timeout is not None:
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# No max, but user query: From user query except if above default
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actual_timeout = min(default_timeout, query_timeout)
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elif max_request_timeout is not None and query_timeout is None:
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# Max, no user query: Default except if above max
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actual_timeout = min(default_timeout, max_request_timeout)
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elif max_request_timeout is not None and query_timeout is not None:
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# Max & user query: From user query except if above max
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actual_timeout = min(query_timeout, max_request_timeout)
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logger.debug("actual_timeout={0} (default_timeout={1}, ?timeout_limit={2}, max_request_timeout={3})"
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.format(self.actual_timeout, default_timeout, query_timeout, max_request_timeout))
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return requests, actual_timeout
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def search_standard(self):
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"""
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Update self.result_container, self.actual_timeout
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"""
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requests, self.actual_timeout = self._get_requests()
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# send all search-request
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if requests:
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search_multiple_requests(requests, self.result_container, self.start_time, self.actual_timeout)
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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 True
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# do search-request
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def search(self):
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self.start_time = time()
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if not self.search_external_bang():
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if not self.search_answerers():
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self.search_standard()
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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, ordered_plugin_list, request):
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super().__init__(search_query)
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self.ordered_plugin_list = ordered_plugin_list
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self.request = request
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def search(self):
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if plugins.call(self.ordered_plugin_list, 'pre_search', self.request, self):
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super().search()
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plugins.call(self.ordered_plugin_list, '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(self.ordered_plugin_list, 'on_result', self.request, self, result)
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return self.result_container
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