''' 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, ''' 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 from searx.query import Query number_of_searches = 0 # get default reqest parameter def default_request_params(): return { 'method': 'GET', 'headers': {}, 'data': {}, 'url': '', 'cookies': {}} # create a callback wrapper for the search engine results 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 # update stats with current page-load-time engines[engine_name].stats['page_load_time'] += \ (datetime.now() - params['started']).total_seconds() try: search_results = callback(response) except Exception, e: # increase errors stats engines[engine_name].stats['errors'] += 1 results[engine_name] = cb_res # print engine name and specific error message 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 it is a suggestion, add it to list of suggestions if 'suggestion' in result: # TODO type checks suggestions.add(result['suggestion']) continue # append result cb_res.append(result) results[engine_name] = cb_res return process_callback # score results and remove duplications def score_results(results): # calculate scoring parameters flat_res = filter( None, chain.from_iterable(izip_longest(*results.values()))) flat_len = len(flat_res) engines_len = len(results) results = [] # pass 1: 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 # get weight of this engine if possible if hasattr(engines[res['engine']], 'weight'): weight = float(engines[res['engine']].weight) # calculate score for that engine score = int((flat_len - i) / engines_len) * weight + 1 duplicated = False # check for duplicates for new_res in results: # remove / from the end of the url if required 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 # check if that result is a duplicate 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 # merge duplicates together if duplicated: # using content with more text if res.get('content') > duplicated.get('content'): duplicated['content'] = res['content'] # increase result-score duplicated['score'] += score # add engine to list of result-engines duplicated['engines'].append(res['engine']) # using https if possible 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'] # if there is no duplicate found, append result else: res['score'] = score results.append(res) results = sorted(results, key=itemgetter('score'), reverse=True) # pass 2 : group results by category and template gresults = [] categoryPositions = {} for i, res in enumerate(results): # FIXME : handle more than one category per engine category = engines[res['engine']].categories[0] + ':' + '' if 'template' not in res else res['template'] current = None if category not in categoryPositions else categoryPositions[category] # group with previous results using the same category if the group can accept more result and is not too far from the current position if current != None and (current['count'] > 0) and (len(gresults) - current['index'] < 20): # group with the previous results using the same category with this one index = current['index'] gresults.insert(index, res) # update every index after the current one (including the current one) for k in categoryPositions: v = categoryPositions[k]['index'] if v >= index: categoryPositions[k]['index'] = v+1 # update this category current['count'] -= 1 else: # same category gresults.append(res) # update categoryIndex categoryPositions[category] = { 'index' : len(gresults), 'count' : 8 } # return gresults return gresults class Search(object): """Search information container""" def __init__(self, request): # init vars super(Search, self).__init__() self.query = None self.engines = [] self.categories = [] self.paging = False self.pageno = 1 self.lang = 'all' # set blocked engines 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 = {} # set specific language if set if request.cookies.get('language')\ and request.cookies['language'] in (x[0] for x in language_codes): self.lang = request.cookies['language'] # set request method 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') # set query self.query = self.request_data['q'] # set pagenumber 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) # parse query, if tags are set, which change the serch engine or search-language query_obj = Query(self.query, self.blocked_engines) query_obj.parse_query() # get last selected language in query, if possible # TODO support search with multible languages if len(query_obj.languages): self.lang = query_obj.languages[-1] self.engines = query_obj.engines self.categories = [] # if engines are calculated from query, set categories by using that informations if self.engines: self.categories = list(set(engine['category'] for engine in self.engines)) # otherwise, using defined categories to calculate which engines should be used else: # set used categories for pd_name, pd in self.request_data.items(): if pd_name.startswith('category_'): category = pd_name[9:] # if category is not found in list, skip if not category in categories: continue # add category to list self.categories.append(category) # if no category is specified for this search, using user-defined default-configuration which (is stored in cookie) 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 still no category is specified, using general as default-category if not self.categories: self.categories = ['general'] # using all engines for that search, which are declared under the specific categories 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) # do search-request def search(self, request): global number_of_searches # init vars requests = [] results = {} suggestions = set() # increase number of searches number_of_searches += 1 # set default useragent #user_agent = request.headers.get('User-Agent', '') user_agent = gen_useragent() # start search-reqest for all selected engines for selected_engine in self.engines: if selected_engine['name'] not in engines: continue engine = engines[selected_engine['name']] # if paging is not supported, skip if self.pageno > 1 and not engine.paging: continue # if search-language is set and engine does not provide language-support, skip if self.lang != 'all' and not engine.language_support: continue # set default request parameters 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 # update request parameters dependent on search-engine (contained in engines folder) request_params = engine.request(self.query.encode('utf-8'), request_params) if request_params['url'] is None: # TODO add support of offline engines pass # create a callback wrapper for the search engine results callback = make_callback( selected_engine['name'], results, suggestions, engine.response, request_params ) # create dictionary which contain all informations about the request request_args = dict( headers=request_params['headers'], hooks=dict(response=callback), cookies=request_params['cookies'], timeout=engine.timeout ) # specific type of request (GET or POST) 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 # append request to list requests.append(req(request_params['url'], **request_args)) # send all search-request grequests.map(requests) # update engine-specific stats for engine_name, engine_results in results.items(): engines[engine_name].stats['search_count'] += 1 engines[engine_name].stats['result_count'] += len(engine_results) # score results and remove duplications results = score_results(results) # update engine stats, using calculated score for result in results: for res_engine in result['engines']: engines[result['engine']]\ .stats['score_count'] += result['score'] # return results and suggestions return results, suggestions