forked from zaclys/searxng
215 lines
8.1 KiB
Python
215 lines
8.1 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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# pylint: disable=missing-module-docstring, too-few-public-methods
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import threading
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from copy import copy
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from timeit import default_timer
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from uuid import uuid4
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import flask
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from flask import copy_current_request_context
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import babel
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from searx import 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.results import ResultContainer
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from searx import logger
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from searx.plugins import plugins
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from searx.search.models import EngineRef, SearchQuery
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from searx.engines import load_engines
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from searx.network import initialize as initialize_network, check_network_configuration
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from searx.metrics import initialize as initialize_metrics, counter_inc, histogram_observe_time
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from searx.search.processors import PROCESSORS, initialize as initialize_processors
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from searx.search.checker import initialize as initialize_checker
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logger = logger.getChild('search')
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def initialize(settings_engines=None, enable_checker=False, check_network=False, enable_metrics=True):
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settings_engines = settings_engines or settings['engines']
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load_engines(settings_engines)
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initialize_network(settings_engines, settings['outgoing'])
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if check_network:
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check_network_configuration()
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initialize_metrics([engine['name'] for engine in settings_engines], enable_metrics)
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initialize_processors(settings_engines)
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if enable_checker:
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initialize_checker()
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class Search:
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"""Search information container"""
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__slots__ = "search_query", "result_container", "start_time", "actual_timeout"
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def __init__(self, search_query: SearchQuery):
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"""Initialize the Search"""
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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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# do search-request
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def _get_requests(self):
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# init vars
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requests = []
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# max of all selected engine timeout
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default_timeout = 0
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# start search-request for all selected engines
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for engineref in self.search_query.engineref_list:
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processor = PROCESSORS[engineref.name]
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# stop the request now if the engine is suspend
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if processor.extend_container_if_suspended(self.result_container):
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continue
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# set default request parameters
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request_params = processor.get_params(self.search_query, engineref.category)
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if request_params is None:
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continue
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counter_inc('engine', engineref.name, 'search', 'count', 'sent')
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# append request to list
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requests.append((engineref.name, self.search_query.query, request_params))
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# update default_timeout
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default_timeout = max(default_timeout, processor.engine.timeout)
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# adjust timeout
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max_request_timeout = settings['outgoing']['max_request_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(
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"actual_timeout={0} (default_timeout={1}, ?timeout_limit={2}, max_request_timeout={3})".format(
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actual_timeout, default_timeout, query_timeout, max_request_timeout
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)
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)
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return requests, actual_timeout
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def search_multiple_requests(self, requests):
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# pylint: disable=protected-access
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search_id = str(uuid4())
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for engine_name, query, request_params in requests:
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_search = copy_current_request_context(PROCESSORS[engine_name].search)
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th = threading.Thread( # pylint: disable=invalid-name
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target=_search,
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args=(query, request_params, self.result_container, self.start_time, self.actual_timeout),
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name=search_id,
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)
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th._timeout = False
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th._engine_name = engine_name
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th.start()
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for th in threading.enumerate(): # pylint: disable=invalid-name
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if th.name == search_id:
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remaining_time = max(0.0, self.actual_timeout - (default_timer() - self.start_time))
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th.join(remaining_time)
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if th.is_alive():
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th._timeout = True
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self.result_container.add_unresponsive_engine(th._engine_name, 'timeout')
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PROCESSORS[th._engine_name].logger.error('engine 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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self.search_multiple_requests(requests)
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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) -> ResultContainer:
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self.start_time = default_timer()
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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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"""Inherit from the Search class, add calls to the plugins."""
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__slots__ = 'ordered_plugin_list', 'request'
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def __init__(self, search_query: SearchQuery, ordered_plugin_list, request: flask.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.result_container.on_result = self._on_result
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# pylint: disable=line-too-long
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# get the "real" request to use it outside the Flask context.
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# see
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# * https://github.com/pallets/flask/blob/d01d26e5210e3ee4cbbdef12f05c886e08e92852/src/flask/globals.py#L55
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# * https://github.com/pallets/werkzeug/blob/3c5d3c9bd0d9ce64590f0af8997a38f3823b368d/src/werkzeug/local.py#L548-L559
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# * https://werkzeug.palletsprojects.com/en/2.0.x/local/#werkzeug.local.LocalProxy._get_current_object
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# pylint: enable=line-too-long
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self.request = request._get_current_object()
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def _on_result(self, result):
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return plugins.call(self.ordered_plugin_list, 'on_result', self.request, self, result)
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def search(self) -> ResultContainer:
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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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self.result_container.close()
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return self.result_container
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