searxng/searx/engines/__init__.py

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'''
searx is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
searx is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with searx. If not, see < http://www.gnu.org/licenses/ >.
(C) 2013- by Adam Tauber, <asciimoo@gmail.com>
'''
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from os.path import realpath, dirname, splitext, join
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import sys
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from imp import load_source
from flask_babel import gettext
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from operator import itemgetter
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from searx import settings
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from searx import logger
logger = logger.getChild('engines')
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engine_dir = dirname(realpath(__file__))
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engines = {}
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categories = {'general': []}
engine_shortcuts = {}
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engine_default_args = {'paging': False,
'categories': ['general'],
'language_support': True,
'safesearch': False,
'timeout': settings['outgoing']['request_timeout'],
'shortcut': '-',
'disabled': False,
'suspend_end_time': 0,
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'continuous_errors': 0,
'time_range_support': False}
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def load_module(filename):
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modname = splitext(filename)[0]
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if modname in sys.modules:
del sys.modules[modname]
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filepath = join(engine_dir, filename)
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module = load_source(modname, filepath)
module.name = modname
return module
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def load_engine(engine_data):
if '_' in engine_data['name']:
logger.error('Engine name conains underscore: "{}"'.format(engine_data['name']))
sys.exit(1)
engine_module = engine_data['engine']
try:
engine = load_module(engine_module + '.py')
except:
logger.exception('Cannot load engine "{}"'.format(engine_module))
return None
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for param_name in engine_data:
if param_name == 'engine':
continue
if param_name == 'categories':
if engine_data['categories'] == 'none':
engine.categories = []
else:
engine.categories = map(
str.strip, engine_data['categories'].split(','))
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continue
setattr(engine, param_name, engine_data[param_name])
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for arg_name, arg_value in engine_default_args.iteritems():
if not hasattr(engine, arg_name):
setattr(engine, arg_name, arg_value)
# checking required variables
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for engine_attr in dir(engine):
if engine_attr.startswith('_'):
continue
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if getattr(engine, engine_attr) is None:
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logger.error('Missing engine config attribute: "{0}.{1}"'
.format(engine.name, engine_attr))
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sys.exit(1)
engine.stats = {
'result_count': 0,
'search_count': 0,
'page_load_time': 0,
'score_count': 0,
'errors': 0
}
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for category_name in engine.categories:
categories.setdefault(category_name, []).append(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
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return engine
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def get_engines_stats():
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# TODO refactor
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pageloads = []
results = []
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scores = []
errors = []
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scores_per_result = []
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max_pageload = max_results = max_score = max_errors = max_score_per_result = 0 # noqa
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for engine in engines.values():
if engine.stats['search_count'] == 0:
continue
results_num = \
engine.stats['result_count'] / float(engine.stats['search_count'])
load_times = engine.stats['page_load_time'] / float(engine.stats['search_count']) # noqa
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if results_num:
score = engine.stats['score_count'] / float(engine.stats['search_count']) # noqa
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score_per_result = score / results_num
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else:
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score = score_per_result = 0.0
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max_results = max(results_num, max_results)
max_pageload = max(load_times, max_pageload)
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max_score = max(score, max_score)
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max_score_per_result = max(score_per_result, max_score_per_result)
max_errors = max(max_errors, engine.stats['errors'])
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pageloads.append({'avg': load_times, 'name': engine.name})
results.append({'avg': results_num, 'name': engine.name})
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scores.append({'avg': score, 'name': engine.name})
errors.append({'avg': engine.stats['errors'], 'name': engine.name})
scores_per_result.append({
'avg': score_per_result,
'name': engine.name
})
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for engine in pageloads:
if max_pageload:
engine['percentage'] = int(engine['avg'] / max_pageload * 100)
else:
engine['percentage'] = 0
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for engine in results:
if max_results:
engine['percentage'] = int(engine['avg'] / max_results * 100)
else:
engine['percentage'] = 0
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for engine in scores:
if max_score:
engine['percentage'] = int(engine['avg'] / max_score * 100)
else:
engine['percentage'] = 0
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for engine in scores_per_result:
if max_score_per_result:
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engine['percentage'] = int(engine['avg']
/ max_score_per_result * 100)
else:
engine['percentage'] = 0
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for engine in errors:
if max_errors:
engine['percentage'] = int(float(engine['avg']) / max_errors * 100)
else:
engine['percentage'] = 0
return [
(
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gettext('Page loads (sec)'),
sorted(pageloads, key=itemgetter('avg'))
),
(
gettext('Number of results'),
sorted(results, key=itemgetter('avg'), reverse=True)
),
(
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gettext('Scores'),
sorted(scores, key=itemgetter('avg'), reverse=True)
),
(
gettext('Scores per result'),
sorted(scores_per_result, key=itemgetter('avg'), reverse=True)
),
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(
gettext('Errors'),
sorted(errors, key=itemgetter('avg'), reverse=True)
),
]
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if 'engines' not in settings or not settings['engines']:
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logger.error('No engines found. Edit your settings.yml')
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exit(2)
for engine_data in settings['engines']:
engine = load_engine(engine_data)
if engine is not None:
engines[engine.name] = engine