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[mod] refactoring: processors

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Report to the user suspended engines.

searx.search.processor.abstract:
* manages suspend time (per network).
* reports suspended time to the ResultContainer (method extend_container_if_suspended)
* adds the results to the ResultContainer (method extend_container)
* handles exceptions (method handle_exception)
This commit is contained in:
Alexandre Flament 2021-04-13 15:21:53 +02:00
parent ae5954f2da
commit aae7830d14
9 changed files with 143 additions and 125 deletions
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2
searx/engines/__init__.py
View File

@ -51,8 +51,6 @@ engine_default_args = {'paging': False,
'shortcut': '-',
'disabled': False,
'enable_http': False,
'suspend_end_time': 0,
'continuous_errors': 0,
'time_range_support': False,
'engine_type': 'online',
'display_error_messages': True,

2
searx/network/network.py
View File

@ -199,7 +199,7 @@ class Network:
def get_network(name=None):
global NETWORKS
return NETWORKS[name or DEFAULT_NAME]
return NETWORKS.get(name or DEFAULT_NAME)
def initialize(settings_engines=None, settings_outgoing=None):

4
searx/results.py
View File

@ -369,9 +369,9 @@ class ResultContainer:
return 0
return resultnum_sum / len(self._number_of_results)
def add_unresponsive_engine(self, engine_name, error_type, error_message=None):
def add_unresponsive_engine(self, engine_name, error_type, error_message=None, suspended=False):
if engines[engine_name].display_error_messages:
self.unresponsive_engines.add((engine_name, error_type, error_message))
self.unresponsive_engines.add((engine_name, error_type, error_message, suspended))
def add_timing(self, engine_name, engine_time, page_load_time):
self.timings.append({

6
searx/search/__init__.py
View File

@ -106,12 +106,16 @@ class Search:
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
with threading.RLock():
with processor.lock:
processor.engine.stats['sent_search_count'] += 1
# append request to list

3
searx/search/checker/impl.py
View File

@ -4,7 +4,6 @@ import typing
import types
import functools
import itertools
import threading
from time import time
from urllib.parse import urlparse
@ -385,7 +384,7 @@ class Checker:
engineref_category = search_query.engineref_list[0].category
params = self.processor.get_params(search_query, engineref_category)
if params is not None:
with threading.RLock():
with self.processor.lock:
self.processor.engine.stats['sent_search_count'] += 1
self.processor.search(search_query.query, params, result_container, time(), 5)
return result_container

98
searx/search/processors/abstract.py
View File

@ -1,17 +1,115 @@
# SPDX-License-Identifier: AGPL-3.0-or-later
import threading
from abc import abstractmethod, ABC
from time import time
from searx import logger
from searx.engines import settings
from searx.network import get_time_for_thread, get_network
from searx.metrology.error_recorder import record_exception, record_error
from searx.exceptions import SearxEngineAccessDeniedException
logger = logger.getChild('searx.search.processor')
SUSPENDED_STATUS = {}
class SuspendedStatus:
__slots__ = 'suspend_end_time', 'suspend_reason', 'continuous_errors', 'lock'
def __init__(self):
self.lock = threading.Lock()
self.continuous_errors = 0
self.suspend_end_time = 0
self.suspend_reason = None
@property
def is_suspended(self):
return self.suspend_end_time >= time()
def suspend(self, suspended_time, suspend_reason):
with self.lock:
# update continuous_errors / suspend_end_time
self.continuous_errors += 1
if suspended_time is None:
suspended_time = min(settings['search']['max_ban_time_on_fail'],
self.continuous_errors * settings['search']['ban_time_on_fail'])
self.suspend_end_time = time() + suspended_time
self.suspend_reason = suspend_reason
logger.debug('Suspend engine for %i seconds', suspended_time)
def resume(self):
with self.lock:
# reset the suspend variables
self.continuous_errors = 0
self.suspend_end_time = 0
self.suspend_reason = None
class EngineProcessor(ABC):
__slots__ = 'engine', 'engine_name', 'lock', 'suspended_status'
def __init__(self, engine, engine_name):
self.engine = engine
self.engine_name = engine_name
self.lock = threading.Lock()
key = get_network(self.engine_name)
key = id(key) if key else self.engine_name
self.suspended_status = SUSPENDED_STATUS.setdefault(key, SuspendedStatus())
def handle_exception(self, result_container, reason, exception, suspend=False, display_exception=True):
# update result_container
error_message = str(exception) if display_exception and exception else None
result_container.add_unresponsive_engine(self.engine_name, reason, error_message)
# metrics
with self.lock:
self.engine.stats['errors'] += 1
if exception:
record_exception(self.engine_name, exception)
else:
record_error(self.engine_name, reason)
# suspend the engine ?
if suspend:
suspended_time = None
if isinstance(exception, SearxEngineAccessDeniedException):
suspended_time = exception.suspended_time
self.suspended_status.suspend(suspended_time, reason) # pylint: disable=no-member
def _extend_container_basic(self, result_container, start_time, search_results):
# update result_container
result_container.extend(self.engine_name, search_results)
engine_time = time() - start_time
page_load_time = get_time_for_thread()
result_container.add_timing(self.engine_name, engine_time, page_load_time)
# metrics
with self.lock:
self.engine.stats['engine_time'] += engine_time
self.engine.stats['engine_time_count'] += 1
# update stats with the total HTTP time
if page_load_time is not None and 'page_load_time' in self.engine.stats:
self.engine.stats['page_load_time'] += page_load_time
self.engine.stats['page_load_count'] += 1
def extend_container(self, result_container, start_time, search_results):
if getattr(threading.current_thread(), '_timeout', False):
# the main thread is not waiting anymore
self.handle_exception(result_container, 'Timeout', None)
else:
# check if the engine accepted the request
if search_results is not None:
self._extend_container_basic(result_container, start_time, search_results)
self.suspended_status.resume()
def extend_container_if_suspended(self, result_container):
if self.suspended_status.is_suspended:
result_container.add_unresponsive_engine(self.engine_name,
self.suspended_status.suspend_reason,
suspended=True)
return True
return False
def get_params(self, search_query, engine_category):
# if paging is not supported, skip

33
searx/search/processors/offline.py
View File

@ -1,51 +1,26 @@
# SPDX-License-Identifier: AGPL-3.0-or-later
import threading
from time import time
from searx import logger
from searx.metrology.error_recorder import record_exception, record_error
from searx.search.processors.abstract import EngineProcessor
logger = logger.getChild('search.processor.offline')
logger = logger.getChild('searx.search.processor.offline')
class OfflineProcessor(EngineProcessor):
engine_type = 'offline'
def _record_stats_on_error(self, result_container, start_time):
engine_time = time() - start_time
result_container.add_timing(self.engine_name, engine_time, engine_time)
with threading.RLock():
self.engine.stats['errors'] += 1
def _search_basic(self, query, params):
return self.engine.search(query, params)
def search(self, query, params, result_container, start_time, timeout_limit):
try:
search_results = self._search_basic(query, params)
if search_results:
result_container.extend(self.engine_name, search_results)
engine_time = time() - start_time
result_container.add_timing(self.engine_name, engine_time, engine_time)
with threading.RLock():
self.engine.stats['engine_time'] += engine_time
self.engine.stats['engine_time_count'] += 1
self.extend_container(result_container, start_time, search_results)
except ValueError as e:
record_exception(self.engine_name, e)
self._record_stats_on_error(result_container, start_time)
# do not record the error
logger.exception('engine {0} : invalid input : {1}'.format(self.engine_name, e))
except Exception as e:
record_exception(self.engine_name, e)
self._record_stats_on_error(result_container, start_time)
result_container.add_unresponsive_engine(self.engine_name, 'unexpected crash', str(e))
self.handle_exception(result_container, 'unexpected crash', e)
logger.exception('engine {0} : exception : {1}'.format(self.engine_name, e))
else:
if getattr(threading.current_thread(), '_timeout', False):
record_error(self.engine_name, 'Timeout')

100
searx/search/processors/online.py
View File

@ -1,23 +1,21 @@
# SPDX-License-Identifier: AGPL-3.0-or-later
from time import time
import threading
import asyncio
import httpx
import searx.network
from searx.engines import settings
from searx import logger
from searx.utils import gen_useragent
from searx.exceptions import (SearxEngineAccessDeniedException, SearxEngineCaptchaException,
SearxEngineTooManyRequestsException,)
from searx.metrology.error_recorder import record_exception, record_error
from searx.metrology.error_recorder import record_error
from searx.search.processors.abstract import EngineProcessor
logger = logger.getChild('search.processor.online')
logger = logger.getChild('searx.search.processor.online')
def default_request_params():
@ -41,11 +39,6 @@ class OnlineProcessor(EngineProcessor):
if params is None:
return None
# skip suspended engines
if self.engine.suspend_end_time >= time():
logger.debug('Engine currently suspended: %s', self.engine_name)
return None
# add default params
params.update(default_request_params())
@ -130,89 +123,38 @@ class OnlineProcessor(EngineProcessor):
# set the network
searx.network.set_context_network_name(self.engine_name)
# suppose everything will be alright
http_exception = False
suspended_time = None
try:
# send requests and parse the results
search_results = self._search_basic(query, params)
# check if the engine accepted the request
if search_results is not None:
# yes, so add results
result_container.extend(self.engine_name, search_results)
# update engine time when there is no exception
engine_time = time() - start_time
page_load_time = searx.network.get_time_for_thread()
result_container.add_timing(self.engine_name, engine_time, page_load_time)
with threading.RLock():
self.engine.stats['engine_time'] += engine_time
self.engine.stats['engine_time_count'] += 1
# update stats with the total HTTP time
self.engine.stats['page_load_time'] += page_load_time
self.engine.stats['page_load_count'] += 1
except Exception as e:
record_exception(self.engine_name, e)
# Timing
engine_time = time() - start_time
page_load_time = searx.network.get_time_for_thread()
result_container.add_timing(self.engine_name, engine_time, page_load_time)
# Record the errors
with threading.RLock():
self.engine.stats['errors'] += 1
if (issubclass(e.__class__, (httpx.TimeoutException, asyncio.TimeoutError))):
result_container.add_unresponsive_engine(self.engine_name, 'HTTP timeout')
self.extend_container(result_container, start_time, search_results)
except (httpx.TimeoutException, asyncio.TimeoutError) as e:
# requests timeout (connect or read)
self.handle_exception(result_container, 'HTTP timeout', e, suspend=True, display_exception=False)
logger.error("engine {0} : HTTP requests timeout"
"(search duration : {1} s, timeout: {2} s) : {3}"
.format(self.engine_name, engine_time, timeout_limit, e.__class__.__name__))
http_exception = True
elif (issubclass(e.__class__, (httpx.HTTPError, httpx.StreamError))):
result_container.add_unresponsive_engine(self.engine_name, 'HTTP error')
.format(self.engine_name, time() - start_time,
timeout_limit,
e.__class__.__name__))
except (httpx.HTTPError, httpx.StreamError) as e:
# other requests exception
self.handle_exception(result_container, 'HTTP error', e, suspend=True, display_exception=False)
logger.exception("engine {0} : requests exception"
"(search duration : {1} s, timeout: {2} s) : {3}"
.format(self.engine_name, engine_time, timeout_limit, e))
http_exception = True
elif (issubclass(e.__class__, SearxEngineCaptchaException)):
result_container.add_unresponsive_engine(self.engine_name, 'CAPTCHA required')
.format(self.engine_name, time() - start_time,
timeout_limit,
e))
except SearxEngineCaptchaException as e:
self.handle_exception(result_container, 'CAPTCHA required', e, suspend=True, display_exception=False)
logger.exception('engine {0} : CAPTCHA'.format(self.engine_name))
suspended_time = e.suspended_time # pylint: disable=no-member
elif (issubclass(e.__class__, SearxEngineTooManyRequestsException)):
result_container.add_unresponsive_engine(self.engine_name, 'too many requests')
except SearxEngineTooManyRequestsException as e:
self.handle_exception(result_container, 'too many requests', e, suspend=True, display_exception=False)
logger.exception('engine {0} : Too many requests'.format(self.engine_name))
suspended_time = e.suspended_time # pylint: disable=no-member
elif (issubclass(e.__class__, SearxEngineAccessDeniedException)):
result_container.add_unresponsive_engine(self.engine_name, 'blocked')
except SearxEngineAccessDeniedException as e:
self.handle_exception(result_container, 'blocked', e, suspend=True, display_exception=False)
logger.exception('engine {0} : Searx is blocked'.format(self.engine_name))
suspended_time = e.suspended_time # pylint: disable=no-member
else:
result_container.add_unresponsive_engine(self.engine_name, 'unexpected crash')
# others errors
except Exception as e:
self.handle_exception(result_container, 'unexpected crash', e, display_exception=False)
logger.exception('engine {0} : exception : {1}'.format(self.engine_name, e))
else:
if getattr(threading.current_thread(), '_timeout', False):
record_error(self.engine_name, 'Timeout')
# suspend the engine if there is an HTTP error
# or suspended_time is defined
with threading.RLock():
if http_exception or suspended_time:
# update continuous_errors / suspend_end_time
self.engine.continuous_errors += 1
if suspended_time is None:
suspended_time = min(settings['search']['max_ban_time_on_fail'],
self.engine.continuous_errors * settings['search']['ban_time_on_fail'])
self.engine.suspend_end_time = time() + suspended_time
else:
# reset the suspend variables
self.engine.continuous_errors = 0
self.engine.suspend_end_time = 0
def get_default_tests(self):
tests = {}

2
searx/webapp.py
View File

@ -764,6 +764,8 @@ def __get_translated_errors(unresponsive_engines):
error_msg = gettext(unresponsive_engine[1])
if unresponsive_engine[2]:
error_msg = "{} {}".format(error_msg, unresponsive_engine[2])
if unresponsive_engine[3]:
error_msg = gettext('Suspended') + ': ' + error_msg
translated_errors.add((unresponsive_engine[0], error_msg))
return translated_errors