import re
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):
"""Lazy compare between two URL.
"www.example.com" and "example.com" are equals.
"www.example.com/path/" and "www.example.com/path" are equals.
"https://www.example.com/" and "http://www.example.com/" are equals.
Args:
url_a (ParseResult): first URL
url_b (ParseResult): second URL
Returns:
bool: True if url_a and url_b are equals
"""
# 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', ''))
entity_url2 = url2.get('entity')
for url1 in urls1:
if (entity_url2 is not None and url1.get('entity') == entity_url2)\
or 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')
if attributes1 is None:
infobox1['attributes'] = attributes1 = []
attributeSet = set()
for attribute in attributes1:
label = attribute.get('label')
if label not in attributeSet:
attributeSet.add(label)
entity = attribute.get('entity')
if entity not in attributeSet:
attributeSet.add(entity)
for attribute in infobox2.get('attributes', []):
if attribute.get('label') not in attributeSet\
and attribute.get('entity') 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:
"""docstring for ResultContainer"""
__slots__ = '_merged_results', 'infoboxes', 'suggestions', 'answers', 'corrections', '_number_of_results',\
'_ordered', 'paging', 'unresponsive_engines', 'timings', 'redirect_url'
def __init__(self):
super().__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
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