searxng/searx/results.py
Alexandre Flament 660c180170 [mod] plugin: call on_result after each engine from the ResultContainer
Currently, searx.search.Search calls on_result once the engine results have been merged
(ResultContainer.order_results).

on_result plugins can rewrite the results: once the URL(s) are modified, even they can be merged,
it won't be the case since ResultContainer.order_results has already be called.

This commit call on_result inside for each result of each engines.
In addition the on_result function can return False to remove the result.

Note: the on_result function now run on the engine thread instead of the Flask thread.
2021-09-09 11:31:44 +02:00

404 lines
15 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
from searx.metrics import histogram_observe, counter_add, count_error
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',\
'_closed', 'paging', 'unresponsive_engines', 'timings', 'redirect_url', 'engine_data', 'on_result'
def __init__(self):
super().__init__()
self._merged_results = []
self.infoboxes = []
self.suggestions = set()
self.answers = {}
self.corrections = set()
self._number_of_results = []
self.engine_data = defaultdict(dict)
self._closed = False
self.paging = False
self.unresponsive_engines = set()
self.timings = []
self.redirect_url = None
self.on_result = lambda _: True
def extend(self, engine_name, results):
if self._closed:
return
standard_result_count = 0
error_msgs = set()
for result in list(results):
result['engine'] = engine_name
if 'suggestion' in result and self.on_result(result):
self.suggestions.add(result['suggestion'])
elif 'answer' in result and self.on_result(result):
self.answers[result['answer']] = result
elif 'correction' in result and self.on_result(result):
self.corrections.add(result['correction'])
elif 'infobox' in result and self.on_result(result):
self._merge_infobox(result)
elif 'number_of_results' in result and self.on_result(result):
self._number_of_results.append(result['number_of_results'])
elif 'engine_data' in result and self.on_result(result):
self.engine_data[engine_name][result['key']] = result['engine_data']
elif 'url' in result:
# standard result (url, title, content)
if not self._is_valid_url_result(result, error_msgs):
continue
# normalize the result
self._normalize_url_result(result)
# call on_result call searx.search.SearchWithPlugins._on_result
# which calls the plugins
if not self.on_result(result):
continue
self.__merge_url_result(result, standard_result_count + 1)
standard_result_count += 1
elif self.on_result(result):
self.__merge_result_no_url(result, standard_result_count + 1)
standard_result_count += 1
if len(error_msgs) > 0:
for msg in error_msgs:
count_error(engine_name, 'some results are invalids: ' + msg, secondary=True)
if engine_name in engines:
histogram_observe(standard_result_count, 'engine', engine_name, '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 _is_valid_url_result(self, result, error_msgs):
if 'url' in result:
if not isinstance(result['url'], str):
logger.debug('result: invalid URL: %s', str(result))
error_msgs.add('invalid URL')
return False
if 'title' in result and not isinstance(result['title'], str):
logger.debug('result: invalid title: %s', str(result))
error_msgs.add('invalid title')
return False
if 'content' in result:
if not isinstance(result['content'], str):
logger.debug('result: invalid content: %s', str(result))
error_msgs.add('invalid content')
return False
return True
def _normalize_url_result(self, result):
"""Return True if the result is valid
"""
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()
# strip multiple spaces and cariage returns from content
result['content'] = WHITESPACE_REGEX.sub(' ', result['content'])
return True
def __merge_url_result(self, result, position):
result['engines'] = set([result['engine']])
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 close(self):
self._closed = True
for result in self._merged_results:
score = result_score(result)
result['score'] = score
for result_engine in result['engines']:
counter_add(score, 'engine', result_engine, 'score')
results = sorted(self._merged_results, key=itemgetter('score'), reverse=True)
# pass 2 : group results by category and template
gresults = []
categoryPositions = {}
for res in results:
# FIXME : handle more than one category per engine
engine = engines[res['engine']]
res['category'] = engine.categories[0] if len(engine.categories) > 0 else ''
# FIXME : handle more than one category per engine
category = res['category']\
+ ':' + 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._merged_results = gresults
def get_ordered_results(self):
if not self._closed:
self.close()
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, suspended=False):
if engines[engine_name].display_error_messages:
self.unresponsive_engines.add((engine_name, error_type, error_message, suspended))
def add_timing(self, engine_name, engine_time, page_load_time):
timing = {
'engine': engines[engine_name].shortcut,
'total': engine_time,
'load': page_load_time,
}
self.timings.append(timing)
def get_timings(self):
return self.timings