searxng/searx/results.py

241 lines
8.2 KiB
Python
Raw Normal View History

import re
from collections import defaultdict
from operator import itemgetter
from threading import RLock
from urlparse import urlparse, unquote
from searx.engines import engines
CONTENT_LEN_IGNORED_CHARS_REGEX = re.compile('[,;:!?\./\\\\ ()-_]', 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, basestring):
return len(CONTENT_LEN_IGNORED_CHARS_REGEX.sub('', content))
else:
return 0
def compare_urls(url_a, url_b):
if url_a.netloc != url_b.netloc or url_a.query != url_b.query:
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):
if 'urls' in infobox2:
urls1 = infobox1.get('urls', None)
if urls1 is None:
urls1 = []
infobox1.set('urls', urls1)
urlSet = set()
for url in infobox1.get('urls', []):
urlSet.add(url.get('url', None))
for url in infobox2.get('urls', []):
if url.get('url', None) not in urlSet:
urls1.append(url)
if 'attributes' in infobox2:
attributes1 = infobox1.get('attributes', None)
if attributes1 is None:
attributes1 = []
infobox1.set('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', []):
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.set('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"""
def __init__(self):
super(ResultContainer, self).__init__()
self.results = defaultdict(list)
self._merged_results = []
self.infoboxes = []
self._infobox_ids = {}
self.suggestions = set()
self.answers = set()
def extend(self, engine_name, results):
for result in list(results):
if 'suggestion' in result:
self.suggestions.add(result['suggestion'])
results.remove(result)
elif 'answer' in result:
2015-10-26 13:22:27 +00:00
self.answers.add(result['answer'])
2015-10-03 17:16:26 +00:00
results.remove(result)
elif 'infobox' in result:
self._merge_infobox(result)
results.remove(result)
with RLock():
engines[engine_name].stats['search_count'] += 1
engines[engine_name].stats['result_count'] += len(results)
if not results:
return
self.results[engine_name].extend(results)
for i, result in enumerate(results):
position = i + 1
self._merge_result(result, position)
def _merge_infobox(self, infobox):
add_infobox = True
infobox_id = infobox.get('id', None)
if infobox_id is not None:
existingIndex = self._infobox_ids.get(infobox_id, None)
if existingIndex is not None:
merge_two_infoboxes(self.infoboxes[existingIndex], infobox)
add_infobox = False
if add_infobox:
self.infoboxes.append(infobox)
self._infobox_ids[infobox_id] = len(self.infoboxes) - 1
def _merge_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['host'] = result['parsed_url'].netloc
if result['host'].startswith('www.'):
result['host'] = result['host'].replace('www.', '', 1)
result['engines'] = [result['engine']]
# strip multiple spaces and cariage returns from content
if result.get('content'):
result['content'] = WHITESPACE_REGEX.sub(' ', result['content'])
# check for duplicates
duplicated = False
for merged_result in self._merged_results:
if compare_urls(result['parsed_url'], merged_result['parsed_url'])\
and result.get('template') == merged_result.get('template'):
duplicated = merged_result
break
# merge duplicates together
if duplicated:
# using content with more text
if result_content_len(result.get('content', '')) >\
result_content_len(duplicated.get('content', '')):
duplicated['content'] = result['content']
# add the new position
duplicated['positions'].append(position)
# add engine to list of result-engines
duplicated['engines'].append(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']
# if there is no duplicate found, append result
else:
result['positions'] = [position]
with RLock():
self._merged_results.append(result)
def get_ordered_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
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 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}
# return gresults
return gresults
def results_length(self):
return len(self._merged_results)