searxng/searx/search/__init__.py
2021-09-07 13:34:35 +02:00

196 lines
7.1 KiB
Python

# SPDX-License-Identifier: AGPL-3.0-or-later
# lint: pylint
# pylint: disable=missing-module-docstring
import typing
import threading
from timeit import default_timer
from uuid import uuid4
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.models import EngineRef, SearchQuery
from searx.engines import load_engines
from searx.network import initialize as initialize_network
from searx.metrics import initialize as initialize_metrics, counter_inc, histogram_observe_time
from searx.search.processors import PROCESSORS, initialize as initialize_processors
from searx.search.checker import initialize as initialize_checker
logger = logger.getChild('search')
def initialize(settings_engines=None, enable_checker=False):
settings_engines = settings_engines or settings['engines']
load_engines(settings_engines)
initialize_network(settings_engines, settings['outgoing'])
initialize_metrics([engine['name'] for engine in settings_engines])
initialize_processors(settings_engines)
if enable_checker:
initialize_checker()
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]
# stop the request now if the engine is suspend
if processor.extend_container_if_suspended(self.result_container):
continue
# set default request parameters
request_params = processor.get_params(self.search_query, engineref.category)
if request_params is None:
continue
counter_inc('engine', engineref.name, 'search', 'count', 'sent')
# 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
max_request_timeout = settings['outgoing']['max_request_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):
# pylint: disable=protected-access
search_id = uuid4().__str__()
for engine_name, query, request_params in requests:
th = threading.Thread( # pylint: disable=invalid-name
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(): # pylint: disable=invalid-name
if th.name == search_id:
remaining_time = max(0.0, self.actual_timeout - (default_timer() - 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)
# return results, suggestions, answers and infoboxes
return True
# do search-request
def search(self):
self.start_time = default_timer()
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