mirror of
https://github.com/searxng/searxng
synced 2024-01-01 18:24:07 +00:00
421 lines
15 KiB
Python
421 lines
15 KiB
Python
import re
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from collections import defaultdict
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from operator import itemgetter
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from threading import RLock
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from typing import List, NamedTuple
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from urllib.parse import urlparse, unquote
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from searx import logger
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from searx.engines import engines
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from searx.metrics import histogram_observe, counter_add, count_error
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CONTENT_LEN_IGNORED_CHARS_REGEX = re.compile(r'[,;:!?\./\\\\ ()-_]', re.M | re.U)
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WHITESPACE_REGEX = re.compile('( |\t|\n)+', re.M | re.U)
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# return the meaningful length of the content for a result
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def result_content_len(content):
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if isinstance(content, str):
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return len(CONTENT_LEN_IGNORED_CHARS_REGEX.sub('', content))
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else:
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return 0
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def compare_urls(url_a, url_b):
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"""Lazy compare between two URL.
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"www.example.com" and "example.com" are equals.
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"www.example.com/path/" and "www.example.com/path" are equals.
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"https://www.example.com/" and "http://www.example.com/" are equals.
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Args:
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url_a (ParseResult): first URL
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url_b (ParseResult): second URL
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Returns:
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bool: True if url_a and url_b are equals
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"""
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# ignore www. in comparison
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if url_a.netloc.startswith('www.'):
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host_a = url_a.netloc.replace('www.', '', 1)
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else:
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host_a = url_a.netloc
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if url_b.netloc.startswith('www.'):
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host_b = url_b.netloc.replace('www.', '', 1)
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else:
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host_b = url_b.netloc
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if host_a != host_b or url_a.query != url_b.query or url_a.fragment != url_b.fragment:
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return False
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# remove / from the end of the url if required
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path_a = url_a.path[:-1] if url_a.path.endswith('/') else url_a.path
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path_b = url_b.path[:-1] if url_b.path.endswith('/') else url_b.path
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return unquote(path_a) == unquote(path_b)
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def merge_two_infoboxes(infobox1, infobox2):
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# get engines weights
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if hasattr(engines[infobox1['engine']], 'weight'):
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weight1 = engines[infobox1['engine']].weight
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else:
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weight1 = 1
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if hasattr(engines[infobox2['engine']], 'weight'):
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weight2 = engines[infobox2['engine']].weight
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else:
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weight2 = 1
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if weight2 > weight1:
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infobox1['engine'] = infobox2['engine']
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infobox1['engines'] |= infobox2['engines']
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if 'urls' in infobox2:
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urls1 = infobox1.get('urls', None)
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if urls1 is None:
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urls1 = []
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for url2 in infobox2.get('urls', []):
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unique_url = True
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parsed_url2 = urlparse(url2.get('url', ''))
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entity_url2 = url2.get('entity')
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for url1 in urls1:
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if (entity_url2 is not None and url1.get('entity') == entity_url2) or compare_urls(
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urlparse(url1.get('url', '')), parsed_url2
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):
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unique_url = False
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break
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if unique_url:
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urls1.append(url2)
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infobox1['urls'] = urls1
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if 'img_src' in infobox2:
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img1 = infobox1.get('img_src', None)
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img2 = infobox2.get('img_src')
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if img1 is None:
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infobox1['img_src'] = img2
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elif weight2 > weight1:
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infobox1['img_src'] = img2
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if 'attributes' in infobox2:
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attributes1 = infobox1.get('attributes')
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if attributes1 is None:
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infobox1['attributes'] = attributes1 = []
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attributeSet = set()
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for attribute in attributes1:
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label = attribute.get('label')
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if label not in attributeSet:
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attributeSet.add(label)
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entity = attribute.get('entity')
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if entity not in attributeSet:
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attributeSet.add(entity)
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for attribute in infobox2.get('attributes', []):
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if attribute.get('label') not in attributeSet and attribute.get('entity') not in attributeSet:
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attributes1.append(attribute)
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if 'content' in infobox2:
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content1 = infobox1.get('content', None)
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content2 = infobox2.get('content', '')
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if content1 is not None:
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if result_content_len(content2) > result_content_len(content1):
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infobox1['content'] = content2
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else:
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infobox1['content'] = content2
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def result_score(result):
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weight = 1.0
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for result_engine in result['engines']:
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if hasattr(engines[result_engine], 'weight'):
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weight *= float(engines[result_engine].weight)
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occurences = len(result['positions'])
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return sum((occurences * weight) / position for position in result['positions'])
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class Timing(NamedTuple):
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engine: str
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total: float
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load: float
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class ResultContainer:
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"""docstring for ResultContainer"""
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__slots__ = (
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'_merged_results',
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'infoboxes',
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'suggestions',
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'answers',
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'corrections',
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'_number_of_results',
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'_closed',
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'paging',
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'unresponsive_engines',
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'timings',
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'redirect_url',
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'engine_data',
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'on_result',
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'_lock',
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)
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def __init__(self):
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super().__init__()
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self._merged_results = []
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self.infoboxes = []
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self.suggestions = set()
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self.answers = {}
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self.corrections = set()
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self._number_of_results = []
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self.engine_data = defaultdict(dict)
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self._closed = False
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self.paging = False
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self.unresponsive_engines = set()
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self.timings: List[Timing] = []
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self.redirect_url = None
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self.on_result = lambda _: True
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self._lock = RLock()
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def extend(self, engine_name, results):
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if self._closed:
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return
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standard_result_count = 0
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error_msgs = set()
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for result in list(results):
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result['engine'] = engine_name
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if 'suggestion' in result and self.on_result(result):
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self.suggestions.add(result['suggestion'])
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elif 'answer' in result and self.on_result(result):
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self.answers[result['answer']] = result
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elif 'correction' in result and self.on_result(result):
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self.corrections.add(result['correction'])
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elif 'infobox' in result and self.on_result(result):
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self._merge_infobox(result)
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elif 'number_of_results' in result and self.on_result(result):
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self._number_of_results.append(result['number_of_results'])
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elif 'engine_data' in result and self.on_result(result):
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self.engine_data[engine_name][result['key']] = result['engine_data']
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elif 'url' in result:
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# standard result (url, title, content)
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if not self._is_valid_url_result(result, error_msgs):
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continue
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# normalize the result
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self._normalize_url_result(result)
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# call on_result call searx.search.SearchWithPlugins._on_result
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# which calls the plugins
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if not self.on_result(result):
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continue
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self.__merge_url_result(result, standard_result_count + 1)
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standard_result_count += 1
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elif self.on_result(result):
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self.__merge_result_no_url(result, standard_result_count + 1)
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standard_result_count += 1
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if len(error_msgs) > 0:
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for msg in error_msgs:
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count_error(engine_name, 'some results are invalids: ' + msg, secondary=True)
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if engine_name in engines:
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histogram_observe(standard_result_count, 'engine', engine_name, 'result', 'count')
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if not self.paging and standard_result_count > 0 and engine_name in engines and engines[engine_name].paging:
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self.paging = True
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def _merge_infobox(self, infobox):
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add_infobox = True
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infobox_id = infobox.get('id', None)
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infobox['engines'] = set([infobox['engine']])
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if infobox_id is not None:
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parsed_url_infobox_id = urlparse(infobox_id)
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with self._lock:
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for existingIndex in self.infoboxes:
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if compare_urls(urlparse(existingIndex.get('id', '')), parsed_url_infobox_id):
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merge_two_infoboxes(existingIndex, infobox)
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add_infobox = False
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if add_infobox:
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self.infoboxes.append(infobox)
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def _is_valid_url_result(self, result, error_msgs):
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if 'url' in result:
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if not isinstance(result['url'], str):
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logger.debug('result: invalid URL: %s', str(result))
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error_msgs.add('invalid URL')
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return False
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if 'title' in result and not isinstance(result['title'], str):
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logger.debug('result: invalid title: %s', str(result))
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error_msgs.add('invalid title')
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return False
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if 'content' in result:
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if not isinstance(result['content'], str):
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logger.debug('result: invalid content: %s', str(result))
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error_msgs.add('invalid content')
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return False
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return True
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def _normalize_url_result(self, result):
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"""Return True if the result is valid"""
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result['parsed_url'] = urlparse(result['url'])
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# if the result has no scheme, use http as default
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if not result['parsed_url'].scheme:
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result['parsed_url'] = result['parsed_url']._replace(scheme="http")
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result['url'] = result['parsed_url'].geturl()
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# strip multiple spaces and cariage returns from content
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if result.get('content'):
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result['content'] = WHITESPACE_REGEX.sub(' ', result['content'])
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return True
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def __merge_url_result(self, result, position):
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result['engines'] = set([result['engine']])
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with self._lock:
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duplicated = self.__find_duplicated_http_result(result)
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if duplicated:
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self.__merge_duplicated_http_result(duplicated, result, position)
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return
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# if there is no duplicate found, append result
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result['positions'] = [position]
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self._merged_results.append(result)
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def __find_duplicated_http_result(self, result):
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result_template = result.get('template')
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for merged_result in self._merged_results:
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if 'parsed_url' not in merged_result:
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continue
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if compare_urls(result['parsed_url'], merged_result['parsed_url']) and result_template == merged_result.get(
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'template'
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):
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if result_template != 'images.html':
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# not an image, same template, same url : it's a duplicate
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return merged_result
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else:
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# it's an image
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# it's a duplicate if the parsed_url, template and img_src are differents
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if result.get('img_src', '') == merged_result.get('img_src', ''):
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return merged_result
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return None
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def __merge_duplicated_http_result(self, duplicated, result, position):
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# using content with more text
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if result_content_len(result.get('content', '')) > result_content_len(duplicated.get('content', '')):
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duplicated['content'] = result['content']
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# merge all result's parameters not found in duplicate
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for key in result.keys():
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if not duplicated.get(key):
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duplicated[key] = result.get(key)
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# add the new position
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duplicated['positions'].append(position)
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# add engine to list of result-engines
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duplicated['engines'].add(result['engine'])
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# using https if possible
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if duplicated['parsed_url'].scheme != 'https' and result['parsed_url'].scheme == 'https':
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duplicated['url'] = result['parsed_url'].geturl()
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duplicated['parsed_url'] = result['parsed_url']
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def __merge_result_no_url(self, result, position):
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result['engines'] = set([result['engine']])
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result['positions'] = [position]
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with self._lock:
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self._merged_results.append(result)
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def close(self):
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self._closed = True
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for result in self._merged_results:
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score = result_score(result)
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result['score'] = score
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for result_engine in result['engines']:
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counter_add(score, 'engine', result_engine, 'score')
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results = sorted(self._merged_results, key=itemgetter('score'), reverse=True)
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# pass 2 : group results by category and template
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gresults = []
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categoryPositions = {}
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for res in results:
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# FIXME : handle more than one category per engine
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engine = engines[res['engine']]
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res['category'] = engine.categories[0] if len(engine.categories) > 0 else ''
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# FIXME : handle more than one category per engine
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category = (
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res['category']
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+ ':'
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+ res.get('template', '')
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+ ':'
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+ ('img_src' if 'img_src' in res or 'thumbnail' in res else '')
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)
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current = None if category not in categoryPositions else categoryPositions[category]
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# group with previous results using the same category
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# if the group can accept more result and is not too far
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# from the current position
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if current is not None and (current['count'] > 0) and (len(gresults) - current['index'] < 20):
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# group with the previous results using
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# the same category with this one
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index = current['index']
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gresults.insert(index, res)
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# update every index after the current one
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# (including the current one)
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for k in categoryPositions:
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v = categoryPositions[k]['index']
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if v >= index:
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categoryPositions[k]['index'] = v + 1
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# update this category
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current['count'] -= 1
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else:
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# same category
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gresults.append(res)
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# update categoryIndex
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categoryPositions[category] = {'index': len(gresults), 'count': 8}
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# update _merged_results
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self._merged_results = gresults
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def get_ordered_results(self):
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if not self._closed:
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self.close()
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return self._merged_results
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def results_length(self):
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return len(self._merged_results)
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def results_number(self):
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resultnum_sum = sum(self._number_of_results)
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if not resultnum_sum or not self._number_of_results:
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return 0
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return resultnum_sum / len(self._number_of_results)
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def add_unresponsive_engine(self, engine_name, error_type, error_message=None, suspended=False):
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if engines[engine_name].display_error_messages:
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self.unresponsive_engines.add((engine_name, error_type, error_message, suspended))
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def add_timing(self, engine_name: str, engine_time: float, page_load_time: float):
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self.timings.append(Timing(engine_name, total=engine_time, load=page_load_time))
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def get_timings(self):
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return self.timings
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