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add comments to search.py
* add comments * add licence-header
This commit is contained in:
Thomas Pointhuber
parent
d23dd7e276
commit
c9bab0e833
118
searx/search.py
118
searx/search.py
@ -1,3 +1,20 @@
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'''
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searx is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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searx is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with searx. If not, see < http://www.gnu.org/licenses/ >.
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(C) 2013- by Adam Tauber, <asciimoo@gmail.com>
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'''
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import grequests
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from itertools import izip_longest, chain
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from datetime import datetime
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@ -9,46 +26,67 @@ from searx.engines import (
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from searx.languages import language_codes
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from searx.utils import gen_useragent
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number_of_searches = 0
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# get default reqest parameter
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def default_request_params():
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return {
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'method': 'GET', 'headers': {}, 'data': {}, 'url': '', 'cookies': {}}
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# create a callback wrapper for the search engine results
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def make_callback(engine_name, results, suggestions, callback, params):
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# creating a callback wrapper for the search engine results
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def process_callback(response, **kwargs):
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cb_res = []
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response.search_params = params
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# update stats with current page-load-time
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engines[engine_name].stats['page_load_time'] += \
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(datetime.now() - params['started']).total_seconds()
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try:
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search_results = callback(response)
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except Exception, e:
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# increase errors stats
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engines[engine_name].stats['errors'] += 1
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results[engine_name] = cb_res
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# print engine name and specific error message
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print '[E] Error with engine "{0}":\n\t{1}'.format(
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engine_name, str(e))
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return
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for result in search_results:
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result['engine'] = engine_name
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# if it is a suggestion, add it to list of suggestions
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if 'suggestion' in result:
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# TODO type checks
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suggestions.add(result['suggestion'])
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continue
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# append result
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cb_res.append(result)
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results[engine_name] = cb_res
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return process_callback
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# score results and remove duplications
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def score_results(results):
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# calculate scoring parameters
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flat_res = filter(
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None, chain.from_iterable(izip_longest(*results.values())))
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flat_len = len(flat_res)
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engines_len = len(results)
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results = []
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# deduplication + scoring
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for i, res in enumerate(flat_res):
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@ -62,34 +100,54 @@ def score_results(results):
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res['engines'] = [res['engine']]
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weight = 1.0
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# get weight of this engine if possible
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if hasattr(engines[res['engine']], 'weight'):
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weight = float(engines[res['engine']].weight)
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# calculate score for that engine
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score = int((flat_len - i) / engines_len) * weight + 1
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duplicated = False
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# check for duplicates
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for new_res in results:
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# remove / from the end of the url if required
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p1 = res['parsed_url'].path[:-1] if res['parsed_url'].path.endswith('/') else res['parsed_url'].path # noqa
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p2 = new_res['parsed_url'].path[:-1] if new_res['parsed_url'].path.endswith('/') else new_res['parsed_url'].path # noqa
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# check if that result is a duplicate
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if res['host'] == new_res['host'] and\
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unquote(p1) == unquote(p2) and\
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res['parsed_url'].query == new_res['parsed_url'].query and\
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res.get('template') == new_res.get('template'):
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duplicated = new_res
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break
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# merge duplicates together
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if duplicated:
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# using content with more text
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if res.get('content') > duplicated.get('content'):
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duplicated['content'] = res['content']
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# increase result-score
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duplicated['score'] += score
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# add engine to list of result-engines
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duplicated['engines'].append(res['engine'])
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# using https if possible
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if duplicated['parsed_url'].scheme == 'https':
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continue
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elif res['parsed_url'].scheme == 'https':
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duplicated['url'] = res['parsed_url'].geturl()
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duplicated['parsed_url'] = res['parsed_url']
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# if there is no duplicate found, append result
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else:
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res['score'] = score
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results.append(res)
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# return results sorted by score
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return sorted(results, key=itemgetter('score'), reverse=True)
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@ -98,6 +156,7 @@ class Search(object):
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"""Search information container"""
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def __init__(self, request):
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# init vars
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super(Search, self).__init__()
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self.query = None
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self.engines = []
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@ -105,18 +164,23 @@ class Search(object):
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self.paging = False
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self.pageno = 1
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self.lang = 'all'
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# set blocked engines
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if request.cookies.get('blocked_engines'):
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self.blocked_engines = request.cookies['blocked_engines'].split(',') # noqa
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else:
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self.blocked_engines = []
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self.results = []
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self.suggestions = []
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self.request_data = {}
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# set specific language if set
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if request.cookies.get('language')\
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and request.cookies['language'] in (x[0] for x in language_codes):
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self.lang = request.cookies['language']
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# set request method
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if request.method == 'POST':
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self.request_data = request.form
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else:
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@ -126,51 +190,72 @@ class Search(object):
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if not self.request_data.get('q'):
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raise Exception('noquery')
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# set query
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self.query = self.request_data['q']
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# set pagenumber
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pageno_param = self.request_data.get('pageno', '1')
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if not pageno_param.isdigit() or int(pageno_param) < 1:
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raise Exception('wrong pagenumber')
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self.pageno = int(pageno_param)
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# parse query, if tags are set, which change the serch engine or search-language
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self.parse_query()
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self.categories = []
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# if engines are calculated from query, set categories by using that informations
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if self.engines:
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self.categories = list(set(engine['category']
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for engine in self.engines))
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# otherwise, using defined categories to calculate which engines should be used
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else:
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# set used categories
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for pd_name, pd in self.request_data.items():
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if pd_name.startswith('category_'):
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category = pd_name[9:]
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# if category is not found in list, skip
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if not category in categories:
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continue
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# add category to list
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self.categories.append(category)
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# if no category is specified for this search, using user-defined default-configuration which (is stored in cookie)
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if not self.categories:
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cookie_categories = request.cookies.get('categories', '')
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cookie_categories = cookie_categories.split(',')
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for ccateg in cookie_categories:
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if ccateg in categories:
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self.categories.append(ccateg)
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# if still no category is specified, using general as default-category
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if not self.categories:
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self.categories = ['general']
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# using all engines for that search, which are declared under the specific categories
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for categ in self.categories:
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self.engines.extend({'category': categ,
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'name': x.name}
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for x in categories[categ]
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if not x.name in self.blocked_engines)
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# parse query, if tags are set, which change the serch engine or search-language
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def parse_query(self):
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query_parts = self.query.split()
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modified = False
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# check if language-prefix is set
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if query_parts[0].startswith(':'):
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lang = query_parts[0][1:].lower()
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# check if any language-code equal with declared language-codes
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for lc in language_codes:
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lang_id, lang_name, country = map(str.lower, lc)
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# if correct language-code is found, set it as new search-language
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if lang == lang_id\
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or lang_id.startswith(lang)\
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or lang == lang_name\
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@ -179,56 +264,78 @@ class Search(object):
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modified = True
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break
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# check if category/engine prefix is set
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elif query_parts[0].startswith('!'):
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prefix = query_parts[0][1:].replace('_', ' ')
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# check if prefix equal with engine shortcut
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if prefix in engine_shortcuts\
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and not engine_shortcuts[prefix] in self.blocked_engines:
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modified = True
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self.engines.append({'category': 'none',
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'name': engine_shortcuts[prefix]})
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# check if prefix equal with engine name
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elif prefix in engines\
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and not prefix in self.blocked_engines:
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modified = True
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self.engines.append({'category': 'none',
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'name': prefix})
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# check if prefix equal with categorie name
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elif prefix in categories:
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modified = True
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# using all engines for that search, which are declared under that categorie name
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self.engines.extend({'category': prefix,
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'name': engine.name}
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for engine in categories[prefix]
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if not engine in self.blocked_engines)
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# if language, category or engine were specificed in this query, search for more tags which does the same
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if modified:
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self.query = self.query.replace(query_parts[0], '', 1).strip()
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self.parse_query()
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# do search-request
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def search(self, request):
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global number_of_searches
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# init vars
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requests = []
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results = {}
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suggestions = set()
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# increase number of active searches
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number_of_searches += 1
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# set default useragent
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#user_agent = request.headers.get('User-Agent', '')
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user_agent = gen_useragent()
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# start search-reqest for all selected engines
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for selected_engine in self.engines:
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if selected_engine['name'] not in engines:
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continue
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engine = engines[selected_engine['name']]
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# if paging is not supported, skip
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if self.pageno > 1 and not engine.paging:
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continue
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# if search-language is set and engine does not provide language-support, skip
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if self.lang != 'all' and not engine.language_support:
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continue
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# set default request parameters
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request_params = default_request_params()
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request_params['headers']['User-Agent'] = user_agent
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request_params['category'] = selected_engine['category']
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request_params['started'] = datetime.now()
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request_params['pageno'] = self.pageno
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request_params['language'] = self.lang
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# update request parameters dependent on search-engine (contained in engines folder)
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request_params = engine.request(self.query.encode('utf-8'),
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request_params)
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@ -236,6 +343,7 @@ class Search(object):
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# TODO add support of offline engines
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pass
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# create a callback wrapper for the search engine results
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callback = make_callback(
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selected_engine['name'],
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results,
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@ -244,6 +352,7 @@ class Search(object):
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request_params
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)
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# create dictionary which contain all informations about the request
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request_args = dict(
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headers=request_params['headers'],
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hooks=dict(response=callback),
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@ -251,6 +360,7 @@ class Search(object):
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timeout=engine.timeout
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)
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# specific type of request (GET or POST)
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if request_params['method'] == 'GET':
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req = grequests.get
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else:
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@ -261,17 +371,25 @@ class Search(object):
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if not request_params['url']:
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continue
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# append request to list
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requests.append(req(request_params['url'], **request_args))
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# send all search-request
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grequests.map(requests)
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# update engine-specific stats
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for engine_name, engine_results in results.items():
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engines[engine_name].stats['search_count'] += 1
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engines[engine_name].stats['result_count'] += len(engine_results)
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# score results and remove duplications
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results = score_results(results)
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# update engine stats, using calculated score
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for result in results:
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for res_engine in result['engines']:
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engines[result['engine']]\
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.stats['score_count'] += result['score']
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# return results and suggestions
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return results, suggestions
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