mirror of
https://github.com/searxng/searxng.git
synced 2024-11-17 18:00:12 +01:00
3d96a9839a
This patch was generated by black [1]::
make format.python
[1] https://github.com/psf/black
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
261 lines
8.8 KiB
Python
261 lines
8.8 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'] )
|
|
|
|
"""
|
|
|
|
import sys
|
|
import copy
|
|
|
|
from os.path import realpath, dirname
|
|
from babel.localedata import locale_identifiers
|
|
from searx import logger, settings
|
|
from searx.data import ENGINES_LANGUAGES
|
|
from searx.network import get
|
|
from searx.utils import load_module, match_language, gen_useragent
|
|
|
|
|
|
logger = logger.getChild('engines')
|
|
ENGINE_DIR = dirname(realpath(__file__))
|
|
BABEL_LANGS = [
|
|
lang_parts[0] + '-' + lang_parts[-1] if len(lang_parts) > 1 else lang_parts[0]
|
|
for lang_parts in (lang_code.split('_') for lang_code in locale_identifiers())
|
|
]
|
|
ENGINE_DEFAULT_ARGS = {
|
|
"engine_type": "online",
|
|
"inactive": False,
|
|
"disabled": False,
|
|
"timeout": settings["outgoing"]["request_timeout"],
|
|
"shortcut": "-",
|
|
"categories": ["general"],
|
|
"supported_languages": [],
|
|
"language_aliases": {},
|
|
"paging": False,
|
|
"safesearch": False,
|
|
"time_range_support": False,
|
|
"enable_http": False,
|
|
"display_error_messages": True,
|
|
"tokens": [],
|
|
}
|
|
"""Defaults for the namespace of an engine module, see :py:func:`load_engine`"""
|
|
|
|
categories = {'general': []}
|
|
engines = {}
|
|
engine_shortcuts = {}
|
|
"""Simple map of registered *shortcuts* to name of the engine (or ``None``).
|
|
|
|
::
|
|
|
|
engine_shortcuts[engine.shortcut] = engine.name
|
|
|
|
"""
|
|
|
|
|
|
def load_engine(engine_data):
|
|
"""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`
|
|
|
|
"""
|
|
|
|
engine_name = engine_data['name']
|
|
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['engine']
|
|
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)
|
|
set_language_attributes(engine)
|
|
update_attributes_for_tor(engine)
|
|
|
|
if not is_engine_active(engine):
|
|
return None
|
|
|
|
if is_missing_required_attributes(engine):
|
|
return None
|
|
|
|
set_loggers(engine, engine_name)
|
|
|
|
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
|
|
for module_name, module in sys.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_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
|
|
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 set_language_attributes(engine):
|
|
# assign supported languages from json file
|
|
if engine.name in ENGINES_LANGUAGES:
|
|
engine.supported_languages = ENGINES_LANGUAGES[engine.name]
|
|
|
|
elif engine.engine in ENGINES_LANGUAGES:
|
|
# The key of the dictionary ENGINES_LANGUAGES is the *engine name*
|
|
# configured in settings.xml. When multiple engines are configured in
|
|
# settings.yml to use the same origin engine (python module) these
|
|
# additional engines can use the languages from the origin engine.
|
|
# For this use the configured ``engine: ...`` from settings.yml
|
|
engine.supported_languages = ENGINES_LANGUAGES[engine.engine]
|
|
|
|
if hasattr(engine, 'language'):
|
|
# For an engine, when there is `language: ...` in the YAML settings, the
|
|
# engine supports only one language, in this case
|
|
# engine.supported_languages should contains this value defined in
|
|
# settings.yml
|
|
if engine.language not in engine.supported_languages:
|
|
raise ValueError(
|
|
"settings.yml - engine: '%s' / language: '%s' not supported" % (engine.name, engine.language)
|
|
)
|
|
|
|
if isinstance(engine.supported_languages, dict):
|
|
engine.supported_languages = {engine.language: engine.supported_languages[engine.language]}
|
|
else:
|
|
engine.supported_languages = [engine.language]
|
|
|
|
# find custom aliases for non standard language codes
|
|
for engine_lang in engine.supported_languages:
|
|
iso_lang = match_language(engine_lang, BABEL_LANGS, fallback=None)
|
|
if (
|
|
iso_lang
|
|
and iso_lang != engine_lang
|
|
and not engine_lang.startswith(iso_lang)
|
|
and iso_lang not in engine.supported_languages
|
|
):
|
|
engine.language_aliases[iso_lang] = engine_lang
|
|
|
|
# language_support
|
|
engine.language_support = len(engine.supported_languages) > 0
|
|
|
|
# assign language fetching method if auxiliary method exists
|
|
if hasattr(engine, '_fetch_supported_languages'):
|
|
headers = {
|
|
'User-Agent': gen_useragent(),
|
|
'Accept-Language': 'ja-JP,ja;q=0.8,en-US;q=0.5,en;q=0.3', # bing needs a non-English language
|
|
}
|
|
engine.fetch_supported_languages = (
|
|
# pylint: disable=protected-access
|
|
lambda: engine._fetch_supported_languages(get(engine.supported_languages_url, headers=headers))
|
|
)
|
|
|
|
|
|
def update_attributes_for_tor(engine):
|
|
if settings['outgoing'].get('using_tor_proxy') 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 is_engine_active(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 settings['outgoing'].get('using_tor_proxy'):
|
|
return False
|
|
|
|
return True
|
|
|
|
|
|
def register_engine(engine):
|
|
if engine.name in engines:
|
|
logger.error('Engine config error: ambigious name: {0}'.format(engine.name))
|
|
sys.exit(1)
|
|
engines[engine.name] = engine
|
|
|
|
if engine.shortcut in engine_shortcuts:
|
|
logger.error('Engine config error: ambigious 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
|