mirror of https://github.com/searxng/searxng.git
241 lines
7.7 KiB
Python
241 lines
7.7 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
# lint: pylint
|
|
"""This module implements the engine loader.
|
|
|
|
Load and initialize the ``engines``, see :py:func:`load_engines` and register
|
|
:py:obj:`engine_shortcuts`.
|
|
|
|
usage::
|
|
|
|
load_engines( settings['engines'] )
|
|
|
|
"""
|
|
|
|
from __future__ import annotations
|
|
|
|
import sys
|
|
import copy
|
|
from os.path import realpath, dirname
|
|
|
|
from typing import TYPE_CHECKING, Dict, Optional
|
|
|
|
from searx import logger, settings
|
|
from searx.utils import load_module
|
|
|
|
if TYPE_CHECKING:
|
|
from searx.enginelib import Engine
|
|
|
|
logger = logger.getChild('engines')
|
|
ENGINE_DIR = dirname(realpath(__file__))
|
|
ENGINE_DEFAULT_ARGS = {
|
|
"engine_type": "online",
|
|
"inactive": False,
|
|
"disabled": False,
|
|
"timeout": settings["outgoing"]["request_timeout"],
|
|
"shortcut": "-",
|
|
"categories": ["general"],
|
|
"paging": False,
|
|
"safesearch": False,
|
|
"time_range_support": False,
|
|
"enable_http": False,
|
|
"using_tor_proxy": False,
|
|
"display_error_messages": True,
|
|
"send_accept_language_header": False,
|
|
"tokens": [],
|
|
"about": {},
|
|
"supported_languages": [], # deprecated use traits
|
|
"language_aliases": {}, # deprecated not needed when using traits
|
|
}
|
|
# set automatically when an engine does not have any tab category
|
|
OTHER_CATEGORY = 'other'
|
|
|
|
|
|
# Defaults for the namespace of an engine module, see :py:func:`load_engine`
|
|
|
|
categories = {'general': []}
|
|
engines: Dict[str, Engine] = {}
|
|
engine_shortcuts = {}
|
|
"""Simple map of registered *shortcuts* to name of the engine (or ``None``).
|
|
|
|
::
|
|
|
|
engine_shortcuts[engine.shortcut] = engine.name
|
|
|
|
:meta hide-value:
|
|
"""
|
|
|
|
|
|
def load_engine(engine_data: dict) -> Optional[Engine]:
|
|
"""Load engine from ``engine_data``.
|
|
|
|
:param dict engine_data: Attributes from YAML ``settings:engines/<engine>``
|
|
:return: initialized namespace of the ``<engine>``.
|
|
|
|
1. create a namespace and load module of the ``<engine>``
|
|
2. update namespace with the defaults from :py:obj:`ENGINE_DEFAULT_ARGS`
|
|
3. update namespace with values from ``engine_data``
|
|
|
|
If engine *is active*, return namespace of the engine, otherwise return
|
|
``None``.
|
|
|
|
This function also returns ``None`` if initialization of the namespace fails
|
|
for one of the following reasons:
|
|
|
|
- engine name contains underscore
|
|
- engine name is not lowercase
|
|
- required attribute is not set :py:func:`is_missing_required_attributes`
|
|
|
|
"""
|
|
# pylint: disable=too-many-return-statements
|
|
|
|
engine_name = engine_data.get('name')
|
|
if engine_name is None:
|
|
logger.error('An engine does not have a "name" field')
|
|
return None
|
|
if '_' in engine_name:
|
|
logger.error('Engine name contains underscore: "{}"'.format(engine_name))
|
|
return None
|
|
|
|
if engine_name.lower() != engine_name:
|
|
logger.warn('Engine name is not lowercase: "{}", converting to lowercase'.format(engine_name))
|
|
engine_name = engine_name.lower()
|
|
engine_data['name'] = engine_name
|
|
|
|
# load_module
|
|
engine_module = engine_data.get('engine')
|
|
if engine_module is None:
|
|
logger.error('The "engine" field is missing for the engine named "{}"'.format(engine_name))
|
|
return None
|
|
try:
|
|
engine = load_module(engine_module + '.py', ENGINE_DIR)
|
|
except (SyntaxError, KeyboardInterrupt, SystemExit, SystemError, ImportError, RuntimeError):
|
|
logger.exception('Fatal exception in engine "{}"'.format(engine_module))
|
|
sys.exit(1)
|
|
except BaseException:
|
|
logger.exception('Cannot load engine "{}"'.format(engine_module))
|
|
return None
|
|
|
|
update_engine_attributes(engine, engine_data)
|
|
update_attributes_for_tor(engine)
|
|
|
|
# avoid cyclic imports
|
|
# pylint: disable=import-outside-toplevel
|
|
from searx.enginelib.traits import EngineTraitsMap
|
|
|
|
trait_map = EngineTraitsMap.from_data()
|
|
trait_map.set_traits(engine)
|
|
|
|
if not is_engine_active(engine):
|
|
return None
|
|
|
|
if is_missing_required_attributes(engine):
|
|
return None
|
|
|
|
set_loggers(engine, engine_name)
|
|
|
|
if not any(cat in settings['categories_as_tabs'] for cat in engine.categories):
|
|
engine.categories.append(OTHER_CATEGORY)
|
|
|
|
return engine
|
|
|
|
|
|
def set_loggers(engine, engine_name):
|
|
# set the logger for engine
|
|
engine.logger = logger.getChild(engine_name)
|
|
# the engine may have load some other engines
|
|
# may sure the logger is initialized
|
|
# use sys.modules.copy() to avoid "RuntimeError: dictionary changed size during iteration"
|
|
# see https://github.com/python/cpython/issues/89516
|
|
# and https://docs.python.org/3.10/library/sys.html#sys.modules
|
|
modules = sys.modules.copy()
|
|
for module_name, module in modules.items():
|
|
if (
|
|
module_name.startswith("searx.engines")
|
|
and module_name != "searx.engines.__init__"
|
|
and not hasattr(module, "logger")
|
|
):
|
|
module_engine_name = module_name.split(".")[-1]
|
|
module.logger = logger.getChild(module_engine_name)
|
|
|
|
|
|
def update_engine_attributes(engine: Engine, engine_data):
|
|
# set engine attributes from engine_data
|
|
for param_name, param_value in engine_data.items():
|
|
if param_name == 'categories':
|
|
if isinstance(param_value, str):
|
|
param_value = list(map(str.strip, param_value.split(',')))
|
|
engine.categories = param_value
|
|
elif hasattr(engine, 'about') and param_name == 'about':
|
|
engine.about = {**engine.about, **engine_data['about']}
|
|
else:
|
|
setattr(engine, param_name, param_value)
|
|
|
|
# set default attributes
|
|
for arg_name, arg_value in ENGINE_DEFAULT_ARGS.items():
|
|
if not hasattr(engine, arg_name):
|
|
setattr(engine, arg_name, copy.deepcopy(arg_value))
|
|
|
|
|
|
def update_attributes_for_tor(engine: Engine) -> bool:
|
|
if using_tor_proxy(engine) and hasattr(engine, 'onion_url'):
|
|
engine.search_url = engine.onion_url + getattr(engine, 'search_path', '')
|
|
engine.timeout += settings['outgoing'].get('extra_proxy_timeout', 0)
|
|
|
|
|
|
def is_missing_required_attributes(engine):
|
|
"""An attribute is required when its name doesn't start with ``_`` (underline).
|
|
Required attributes must not be ``None``.
|
|
|
|
"""
|
|
missing = False
|
|
for engine_attr in dir(engine):
|
|
if not engine_attr.startswith('_') and getattr(engine, engine_attr) is None:
|
|
logger.error('Missing engine config attribute: "{0}.{1}"'.format(engine.name, engine_attr))
|
|
missing = True
|
|
return missing
|
|
|
|
|
|
def using_tor_proxy(engine: Engine):
|
|
"""Return True if the engine configuration declares to use Tor."""
|
|
return settings['outgoing'].get('using_tor_proxy') or getattr(engine, 'using_tor_proxy', False)
|
|
|
|
|
|
def is_engine_active(engine: Engine):
|
|
# check if engine is inactive
|
|
if engine.inactive is True:
|
|
return False
|
|
|
|
# exclude onion engines if not using tor
|
|
if 'onions' in engine.categories and not using_tor_proxy(engine):
|
|
return False
|
|
|
|
return True
|
|
|
|
|
|
def register_engine(engine: Engine):
|
|
if engine.name in engines:
|
|
logger.error('Engine config error: ambiguous name: {0}'.format(engine.name))
|
|
sys.exit(1)
|
|
engines[engine.name] = engine
|
|
|
|
if engine.shortcut in engine_shortcuts:
|
|
logger.error('Engine config error: ambiguous shortcut: {0}'.format(engine.shortcut))
|
|
sys.exit(1)
|
|
engine_shortcuts[engine.shortcut] = engine.name
|
|
|
|
for category_name in engine.categories:
|
|
categories.setdefault(category_name, []).append(engine)
|
|
|
|
|
|
def load_engines(engine_list):
|
|
"""usage: ``engine_list = settings['engines']``"""
|
|
engines.clear()
|
|
engine_shortcuts.clear()
|
|
categories.clear()
|
|
categories['general'] = []
|
|
for engine_data in engine_list:
|
|
engine = load_engine(engine_data)
|
|
if engine:
|
|
register_engine(engine)
|
|
return engines
|