searxng/searx/search/__init__.py
2021-01-12 11:47:17 +01:00

276 lines
9.6 KiB
Python

'''
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 typing
import gc
import threading
from time import time
from uuid import uuid4
from _thread import start_new_thread
from searx import settings
from searx.answerers import ask
from searx.external_bang import get_bang_url
from searx.results import ResultContainer
from searx import logger
from searx.plugins import plugins
from searx.search.processors import processors, initialize as initialize_processors
logger = logger.getChild('search')
max_request_timeout = settings.get('outgoing', {}).get('max_request_timeout' or None)
if max_request_timeout is None:
logger.info('max_request_timeout={0}'.format(max_request_timeout))
else:
if isinstance(max_request_timeout, float):
logger.info('max_request_timeout={0} second(s)'.format(max_request_timeout))
else:
logger.critical('outgoing.max_request_timeout if defined has to be float')
import sys
sys.exit(1)
def initialize(settings_engines=None):
settings_engines = settings_engines or settings['engines']
initialize_processors(settings_engines)
class EngineRef:
__slots__ = 'name', 'category'
def __init__(self, name: str, category: str):
self.name = name
self.category = category
def __repr__(self):
return "EngineRef({!r}, {!r})".format(self.name, self.category)
def __eq__(self, other):
return self.name == other.name and self.category == other.category
def __hash__(self):
return hash((self.name, self.category))
class SearchQuery:
"""container for all the search parameters (query, language, etc...)"""
__slots__ = 'query', 'engineref_list', 'lang', 'safesearch', 'pageno', 'time_range',\
'timeout_limit', 'external_bang'
def __init__(self,
query: str,
engineref_list: typing.List[EngineRef],
lang: str='all',
safesearch: int=0,
pageno: int=1,
time_range: typing.Optional[str]=None,
timeout_limit: typing.Optional[float]=None,
external_bang: typing.Optional[str]=None):
self.query = query
self.engineref_list = engineref_list
self.lang = lang
self.safesearch = safesearch
self.pageno = pageno
self.time_range = time_range
self.timeout_limit = timeout_limit
self.external_bang = external_bang
@property
def categories(self):
return list(set(map(lambda engineref: engineref.category, self.engineref_list)))
def __repr__(self):
return "SearchQuery({!r}, {!r}, {!r}, {!r}, {!r}, {!r}, {!r}, {!r})".\
format(self.query, self.engineref_list, self.lang, self.safesearch,
self.pageno, self.time_range, self.timeout_limit, self.external_bang)
def __eq__(self, other):
return self.query == other.query\
and self.engineref_list == other.engineref_list\
and self.lang == other.lang\
and self.safesearch == other.safesearch\
and self.pageno == other.pageno\
and self.time_range == other.time_range\
and self.timeout_limit == other.timeout_limit\
and self.external_bang == other.external_bang
def __hash__(self):
return hash((self.query, tuple(self.engineref_list), self.lang, self.safesearch, self.pageno, self.time_range,
self.timeout_limit, self.external_bang))
class Search:
"""Search information container"""
__slots__ = "search_query", "result_container", "start_time", "actual_timeout"
def __init__(self, search_query):
# init vars
super().__init__()
self.search_query = search_query
self.result_container = ResultContainer()
self.start_time = None
self.actual_timeout = None
def search_external_bang(self):
"""
Check if there is a external bang.
If yes, update self.result_container and return True
"""
if self.search_query.external_bang:
self.result_container.redirect_url = get_bang_url(self.search_query)
# This means there was a valid bang and the
# rest of the search does not need to be continued
if isinstance(self.result_container.redirect_url, str):
return True
return False
def search_answerers(self):
"""
Check if an answer return a result.
If yes, update self.result_container and return True
"""
answerers_results = ask(self.search_query)
if answerers_results:
for results in answerers_results:
self.result_container.extend('answer', results)
return True
return False
# do search-request
def _get_requests(self):
# init vars
requests = []
# max of all selected engine timeout
default_timeout = 0
# start search-reqest for all selected engines
for engineref in self.search_query.engineref_list:
processor = processors[engineref.name]
# set default request parameters
request_params = processor.get_params(self.search_query, engineref.category)
if request_params is None:
continue
with threading.RLock():
processor.engine.stats['sent_search_count'] += 1
# append request to list
requests.append((engineref.name, self.search_query.query, request_params))
# update default_timeout
default_timeout = max(default_timeout, processor.engine.timeout)
# adjust timeout
actual_timeout = default_timeout
query_timeout = self.search_query.timeout_limit
if max_request_timeout is None and query_timeout is None:
# No max, no user query: default_timeout
pass
elif max_request_timeout is None and query_timeout is not None:
# No max, but user query: From user query except if above default
actual_timeout = min(default_timeout, query_timeout)
elif max_request_timeout is not None and query_timeout is None:
# Max, no user query: Default except if above max
actual_timeout = min(default_timeout, max_request_timeout)
elif max_request_timeout is not None and query_timeout is not None:
# Max & user query: From user query except if above max
actual_timeout = min(query_timeout, max_request_timeout)
logger.debug("actual_timeout={0} (default_timeout={1}, ?timeout_limit={2}, max_request_timeout={3})"
.format(actual_timeout, default_timeout, query_timeout, max_request_timeout))
return requests, actual_timeout
def search_multiple_requests(self, requests):
search_id = uuid4().__str__()
for engine_name, query, request_params in requests:
th = threading.Thread(
target=processors[engine_name].search,
args=(query, request_params, self.result_container, self.start_time, self.actual_timeout),
name=search_id,
)
th._timeout = False
th._engine_name = engine_name
th.start()
for th in threading.enumerate():
if th.name == search_id:
remaining_time = max(0.0, self.actual_timeout - (time() - self.start_time))
th.join(remaining_time)
if th.is_alive():
th._timeout = True
self.result_container.add_unresponsive_engine(th._engine_name, 'timeout')
logger.warning('engine timeout: {0}'.format(th._engine_name))
def search_standard(self):
"""
Update self.result_container, self.actual_timeout
"""
requests, self.actual_timeout = self._get_requests()
# send all search-request
if requests:
self.search_multiple_requests(requests)
start_new_thread(gc.collect, tuple())
# return results, suggestions, answers and infoboxes
return True
# do search-request
def search(self):
self.start_time = time()
if not self.search_external_bang():
if not self.search_answerers():
self.search_standard()
return self.result_container
class SearchWithPlugins(Search):
"""Similar to the Search class but call the plugins."""
__slots__ = 'ordered_plugin_list', 'request'
def __init__(self, search_query, ordered_plugin_list, request):
super().__init__(search_query)
self.ordered_plugin_list = ordered_plugin_list
self.request = request
def search(self):
if plugins.call(self.ordered_plugin_list, 'pre_search', self.request, self):
super().search()
plugins.call(self.ordered_plugin_list, 'post_search', self.request, self)
results = self.result_container.get_ordered_results()
for result in results:
plugins.call(self.ordered_plugin_list, 'on_result', self.request, self, result)
return self.result_container