import grequests
from itertools import izip_longest, chain
from datetime import datetime
from operator import itemgetter
from urlparse import urlparse, unquote
from searx.engines import (
categories, engines, engine_shortcuts
)
from searx.languages import language_codes
from searx.utils import gen_useragent
number_of_searches = 0
def default_request_params():
return {
'method': 'GET', 'headers': {}, 'data': {}, 'url': '', 'cookies': {}}
def make_callback(engine_name, results, suggestions, callback, params):
# creating a callback wrapper for the search engine results
def process_callback(response, **kwargs):
cb_res = []
response.search_params = params
engines[engine_name].stats['page_load_time'] += \
(datetime.now() - params['started']).total_seconds()
try:
search_results = callback(response)
except Exception, e:
engines[engine_name].stats['errors'] += 1
results[engine_name] = cb_res
print '[E] Error with engine "{0}":\n\t{1}'.format(
engine_name, str(e))
return
for result in search_results:
result['engine'] = engine_name
if 'suggestion' in result:
# TODO type checks
suggestions.add(result['suggestion'])
continue
cb_res.append(result)
results[engine_name] = cb_res
return process_callback
def score_results(results):
flat_res = filter(
None, chain.from_iterable(izip_longest(*results.values())))
flat_len = len(flat_res)
engines_len = len(results)
results = []
# deduplication + scoring
for i, res in enumerate(flat_res):
res['parsed_url'] = urlparse(res['url'])
res['host'] = res['parsed_url'].netloc
if res['host'].startswith('www.'):
res['host'] = res['host'].replace('www.', '', 1)
res['engines'] = [res['engine']]
weight = 1.0
if hasattr(engines[res['engine']], 'weight'):
weight = float(engines[res['engine']].weight)
score = int((flat_len - i) / engines_len) * weight + 1
duplicated = False
for new_res in results:
p1 = res['parsed_url'].path[:-1] if res['parsed_url'].path.endswith('/') else res['parsed_url'].path # noqa
p2 = new_res['parsed_url'].path[:-1] if new_res['parsed_url'].path.endswith('/') else new_res['parsed_url'].path # noqa
if res['host'] == new_res['host'] and\
unquote(p1) == unquote(p2) and\
res['parsed_url'].query == new_res['parsed_url'].query and\
res.get('template') == new_res.get('template'):
duplicated = new_res
break
if duplicated:
if res.get('content') > duplicated.get('content'):
duplicated['content'] = res['content']
duplicated['score'] += score
duplicated['engines'].append(res['engine'])
if duplicated['parsed_url'].scheme == 'https':
continue
elif res['parsed_url'].scheme == 'https':
duplicated['url'] = res['parsed_url'].geturl()
duplicated['parsed_url'] = res['parsed_url']
else:
res['score'] = score
results.append(res)
return sorted(results, key=itemgetter('score'), reverse=True)
class Search(object):
"""Search information container"""
def __init__(self, request):
super(Search, self).__init__()
self.query = None
self.engines = []
self.categories = []
self.paging = False
self.pageno = 1
self.lang = 'all'
if request.cookies.get('blocked_engines'):
self.blocked_engines = request.cookies['blocked_engines'].split(',') # noqa
else:
self.blocked_engines = []
self.results = []
self.suggestions = []
self.request_data = {}
if request.cookies.get('language')\
and request.cookies['language'] in (x[0] for x in language_codes):
self.lang = request.cookies['language']
if request.method == 'POST':
self.request_data = request.form
else:
self.request_data = request.args
# TODO better exceptions
if not self.request_data.get('q'):
raise Exception('noquery')
self.query = self.request_data['q']
pageno_param = self.request_data.get('pageno', '1')
if not pageno_param.isdigit() or int(pageno_param) < 1:
raise Exception('wrong pagenumber')
self.pageno = int(pageno_param)
self.parse_query()
self.categories = []
if self.engines:
self.categories = list(set(engine['category']
for engine in self.engines))
else:
for pd_name, pd in self.request_data.items():
if pd_name.startswith('category_'):
category = pd_name[9:]
if not category in categories:
continue
self.categories.append(category)
if not self.categories:
cookie_categories = request.cookies.get('categories', '')
cookie_categories = cookie_categories.split(',')
for ccateg in cookie_categories:
if ccateg in categories:
self.categories.append(ccateg)
if not self.categories:
self.categories = ['general']
for categ in self.categories:
self.engines.extend({'category': categ,
'name': x.name}
for x in categories[categ]
if not x.name in self.blocked_engines)
def parse_query(self):
query_parts = self.query.split()
modified = False
if query_parts[0].startswith(':'):
lang = query_parts[0][1:].lower()
for lc in language_codes:
lang_id, lang_name, country = map(str.lower, lc)
if lang == lang_id\
or lang_id.startswith(lang)\
or lang == lang_name\
or lang == country:
self.lang = lang
modified = True
break
elif query_parts[0].startswith('!'):
prefix = query_parts[0][1:].replace('_', ' ')
if prefix in engine_shortcuts\
and not engine_shortcuts[prefix] in self.blocked_engines:
modified = True
self.engines.append({'category': 'none',
'name': engine_shortcuts[prefix]})
elif prefix in engines\
and not prefix in self.blocked_engines:
modified = True
self.engines.append({'category': 'none',
'name': prefix})
elif prefix in categories:
modified = True
self.engines.extend({'category': prefix,
'name': engine.name}
for engine in categories[prefix]
if not engine in self.blocked_engines)
if modified:
self.query = self.query.replace(query_parts[0], '', 1).strip()
self.parse_query()
def search(self, request):
global number_of_searches
requests = []
results = {}
suggestions = set()
number_of_searches += 1
#user_agent = request.headers.get('User-Agent', '')
user_agent = gen_useragent()
for selected_engine in self.engines:
if selected_engine['name'] not in engines:
continue
engine = engines[selected_engine['name']]
if self.pageno > 1 and not engine.paging:
continue
if self.lang != 'all' and not engine.language_support:
continue
request_params = default_request_params()
request_params['headers']['User-Agent'] = user_agent
request_params['category'] = selected_engine['category']
request_params['started'] = datetime.now()
request_params['pageno'] = self.pageno
request_params['language'] = self.lang
request_params = engine.request(self.query.encode('utf-8'),
request_params)
if request_params['url'] is None:
# TODO add support of offline engines
pass
callback = make_callback(
selected_engine['name'],
results,
suggestions,
engine.response,
request_params
)
request_args = dict(
headers=request_params['headers'],
hooks=dict(response=callback),
cookies=request_params['cookies'],
timeout=engine.timeout
)
if request_params['method'] == 'GET':
req = grequests.get
else:
req = grequests.post
request_args['data'] = request_params['data']
# ignoring empty urls
if not request_params['url']:
continue
requests.append(req(request_params['url'], **request_args))
grequests.map(requests)
for engine_name, engine_results in results.items():
engines[engine_name].stats['search_count'] += 1
engines[engine_name].stats['result_count'] += len(engine_results)
results = score_results(results)
for result in results:
for res_engine in result['engines']:
engines[result['engine']]\
.stats['score_count'] += result['score']
return results, suggestions