searxng/searx/results.py

354 lines
13 KiB
Python

import re
from collections import defaultdict
from operator import itemgetter
from threading import RLock
from urllib.parse import urlparse, unquote
from searx import logger
from searx.engines import engines
CONTENT_LEN_IGNORED_CHARS_REGEX = re.compile(r'[,;:!?\./\\\\ ()-_]', re.M | re.U)
WHITESPACE_REGEX = re.compile('( |\t|\n)+', re.M | re.U)
# return the meaningful length of the content for a result
def result_content_len(content):
if isinstance(content, str):
return len(CONTENT_LEN_IGNORED_CHARS_REGEX.sub('', content))
else:
return 0
def compare_urls(url_a, url_b):
# ignore www. in comparison
if url_a.netloc.startswith('www.'):
host_a = url_a.netloc.replace('www.', '', 1)
else:
host_a = url_a.netloc
if url_b.netloc.startswith('www.'):
host_b = url_b.netloc.replace('www.', '', 1)
else:
host_b = url_b.netloc
if host_a != host_b or url_a.query != url_b.query or url_a.fragment != url_b.fragment:
return False
# remove / from the end of the url if required
path_a = url_a.path[:-1]\
if url_a.path.endswith('/')\
else url_a.path
path_b = url_b.path[:-1]\
if url_b.path.endswith('/')\
else url_b.path
return unquote(path_a) == unquote(path_b)
def merge_two_infoboxes(infobox1, infobox2):
# get engines weights
if hasattr(engines[infobox1['engine']], 'weight'):
weight1 = engines[infobox1['engine']].weight
else:
weight1 = 1
if hasattr(engines[infobox2['engine']], 'weight'):
weight2 = engines[infobox2['engine']].weight
else:
weight2 = 1
if weight2 > weight1:
infobox1['engine'] = infobox2['engine']
infobox1['engines'] |= infobox2['engines']
if 'urls' in infobox2:
urls1 = infobox1.get('urls', None)
if urls1 is None:
urls1 = []
for url2 in infobox2.get('urls', []):
unique_url = True
parsed_url2 = urlparse(url2.get('url', ''))
for url1 in urls1:
if compare_urls(urlparse(url1.get('url', '')), parsed_url2):
unique_url = False
break
if unique_url:
urls1.append(url2)
infobox1['urls'] = urls1
if 'img_src' in infobox2:
img1 = infobox1.get('img_src', None)
img2 = infobox2.get('img_src')
if img1 is None:
infobox1['img_src'] = img2
elif weight2 > weight1:
infobox1['img_src'] = img2
if 'attributes' in infobox2:
attributes1 = infobox1.get('attributes', None)
if attributes1 is None:
attributes1 = []
infobox1['attributes'] = attributes1
attributeSet = set()
for attribute in infobox1.get('attributes', []):
if attribute.get('label', None) not in attributeSet:
attributeSet.add(attribute.get('label', None))
for attribute in infobox2.get('attributes', []):
if attribute.get('label', None) not in attributeSet:
attributes1.append(attribute)
if 'content' in infobox2:
content1 = infobox1.get('content', None)
content2 = infobox2.get('content', '')
if content1 is not None:
if result_content_len(content2) > result_content_len(content1):
infobox1['content'] = content2
else:
infobox1['content'] = content2
def result_score(result):
weight = 1.0
for result_engine in result['engines']:
if hasattr(engines[result_engine], 'weight'):
weight *= float(engines[result_engine].weight)
occurences = len(result['positions'])
return sum((occurences * weight) / position for position in result['positions'])
class ResultContainer(object):
"""docstring for ResultContainer"""
__slots__ = '_merged_results', 'infoboxes', 'suggestions', 'answers', 'corrections', '_number_of_results',\
'_ordered', 'paging', 'unresponsive_engines', 'timings', 'redirect_url'
def __init__(self):
super(ResultContainer, self).__init__()
self._merged_results = []
self.infoboxes = []
self.suggestions = set()
self.answers = {}
self.corrections = set()
self._number_of_results = []
self._ordered = False
self.paging = False
self.unresponsive_engines = set()
self.timings = []
self.redirect_url = None
def extend(self, engine_name, results):
standard_result_count = 0
for result in list(results):
result['engine'] = engine_name
if 'suggestion' in result:
self.suggestions.add(result['suggestion'])
elif 'answer' in result:
self.answers[result['answer']] = result
elif 'correction' in result:
self.corrections.add(result['correction'])
elif 'infobox' in result:
self._merge_infobox(result)
elif 'number_of_results' in result:
self._number_of_results.append(result['number_of_results'])
else:
# standard result (url, title, content)
if 'url' in result and not isinstance(result['url'], str):
logger.debug('result: invalid URL: %s', str(result))
elif 'title' in result and not isinstance(result['title'], str):
logger.debug('result: invalid title: %s', str(result))
elif 'content' in result and not isinstance(result['content'], str):
logger.debug('result: invalid content: %s', str(result))
else:
self._merge_result(result, standard_result_count + 1)
standard_result_count += 1
if engine_name in engines:
with RLock():
engines[engine_name].stats['search_count'] += 1
engines[engine_name].stats['result_count'] += standard_result_count
if not self.paging and standard_result_count > 0 and engine_name in engines\
and engines[engine_name].paging:
self.paging = True
def _merge_infobox(self, infobox):
add_infobox = True
infobox_id = infobox.get('id', None)
infobox['engines'] = set([infobox['engine']])
if infobox_id is not None:
parsed_url_infobox_id = urlparse(infobox_id)
for existingIndex in self.infoboxes:
if compare_urls(urlparse(existingIndex.get('id', '')), parsed_url_infobox_id):
merge_two_infoboxes(existingIndex, infobox)
add_infobox = False
if add_infobox:
self.infoboxes.append(infobox)
def _merge_result(self, result, position):
if 'url' in result:
self.__merge_url_result(result, position)
return
self.__merge_result_no_url(result, position)
def __merge_url_result(self, result, position):
result['parsed_url'] = urlparse(result['url'])
# if the result has no scheme, use http as default
if not result['parsed_url'].scheme:
result['parsed_url'] = result['parsed_url']._replace(scheme="http")
result['url'] = result['parsed_url'].geturl()
result['engines'] = set([result['engine']])
# strip multiple spaces and cariage returns from content
if result.get('content'):
result['content'] = WHITESPACE_REGEX.sub(' ', result['content'])
duplicated = self.__find_duplicated_http_result(result)
if duplicated:
self.__merge_duplicated_http_result(duplicated, result, position)
return
# if there is no duplicate found, append result
result['positions'] = [position]
with RLock():
self._merged_results.append(result)
def __find_duplicated_http_result(self, result):
result_template = result.get('template')
for merged_result in self._merged_results:
if 'parsed_url' not in merged_result:
continue
if compare_urls(result['parsed_url'], merged_result['parsed_url'])\
and result_template == merged_result.get('template'):
if result_template != 'images.html':
# not an image, same template, same url : it's a duplicate
return merged_result
else:
# it's an image
# it's a duplicate if the parsed_url, template and img_src are differents
if result.get('img_src', '') == merged_result.get('img_src', ''):
return merged_result
return None
def __merge_duplicated_http_result(self, duplicated, result, position):
# using content with more text
if result_content_len(result.get('content', '')) >\
result_content_len(duplicated.get('content', '')):
duplicated['content'] = result['content']
# merge all result's parameters not found in duplicate
for key in result.keys():
if not duplicated.get(key):
duplicated[key] = result.get(key)
# add the new position
duplicated['positions'].append(position)
# add engine to list of result-engines
duplicated['engines'].add(result['engine'])
# using https if possible
if duplicated['parsed_url'].scheme != 'https' and result['parsed_url'].scheme == 'https':
duplicated['url'] = result['parsed_url'].geturl()
duplicated['parsed_url'] = result['parsed_url']
def __merge_result_no_url(self, result, position):
result['engines'] = set([result['engine']])
result['positions'] = [position]
with RLock():
self._merged_results.append(result)
def order_results(self):
for result in self._merged_results:
score = result_score(result)
result['score'] = score
with RLock():
for result_engine in result['engines']:
engines[result_engine].stats['score_count'] += score
results = sorted(self._merged_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
res['category'] = engines[res['engine']].categories[0]
# FIXME : handle more than one category per engine
category = engines[res['engine']].categories[0]\
+ ':' + res.get('template', '')\
+ ':' + ('img_src' if 'img_src' in res or 'thumbnail' in res else '')
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 is not 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}
# update _merged_results
self._ordered = True
self._merged_results = gresults
def get_ordered_results(self):
if not self._ordered:
self.order_results()
return self._merged_results
def results_length(self):
return len(self._merged_results)
def results_number(self):
resultnum_sum = sum(self._number_of_results)
if not resultnum_sum or not self._number_of_results:
return 0
return resultnum_sum / len(self._number_of_results)
def add_unresponsive_engine(self, engine_name, error_type, error_message=None):
if engines[engine_name].display_error_messages:
self.unresponsive_engines.add((engine_name, error_type, error_message))
def add_timing(self, engine_name, engine_time, page_load_time):
self.timings.append({
'engine': engines[engine_name].shortcut,
'total': engine_time,
'load': page_load_time
})
def get_timings(self):
return self.timings