forked from zaclys/searxng
bing.py: resolve bing.com/ck/a redirections
add a new function searx.network.multi_requests to send multiple HTTP requests at once
This commit is contained in:
Alexandre Flament
parent
2864a67ce9
commit
a1e8af0796
@ -8,7 +8,8 @@
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import re
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from urllib.parse import urlencode, urlparse, parse_qs
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from lxml import html
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from searx.utils import eval_xpath, extract_text, match_language
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from searx.utils import eval_xpath, extract_text, eval_xpath_list, match_language
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from searx.network import multi_requests, Request
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about = {
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"website": 'https://www.bing.com',
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@ -79,30 +80,48 @@ def response(resp):
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dom = html.fromstring(resp.text)
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for result in eval_xpath(dom, '//div[@class="sa_cc"]'):
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# IMO //div[@class="sa_cc"] does no longer match
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logger.debug('found //div[@class="sa_cc"] --> %s', result)
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link = eval_xpath(result, './/h3/a')[0]
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url = link.attrib.get('href')
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title = extract_text(link)
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content = extract_text(eval_xpath(result, './/p'))
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# append result
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results.append({'url': url, 'title': title, 'content': content})
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# parse results again if nothing is found yet
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for result in eval_xpath(dom, '//li[@class="b_algo"]'):
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url_to_resolve = []
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url_to_resolve_index = []
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for i, result in enumerate(eval_xpath_list(dom, '//li[@class="b_algo"]')):
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link = eval_xpath(result, './/h2/a')[0]
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url = link.attrib.get('href')
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title = extract_text(link)
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content = extract_text(eval_xpath(result, './/p'))
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# get the real URL either using the URL shown to user or following the Bing URL
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if url.startswith('https://www.bing.com/ck/a?'):
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url_cite = extract_text(eval_xpath(result, './/div[@class="b_attribution"]/cite'))
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# Bing can shorten the URL either at the end or in the middle of the string
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if (
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url_cite.startswith('https://')
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and '…' not in url_cite
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and '...' not in url_cite
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and '›' not in url_cite
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):
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# no need for an additional HTTP request
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url = url_cite
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else:
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# resolve the URL with an additional HTTP request
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url_to_resolve.append(url.replace('&ntb=1', '&ntb=F'))
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url_to_resolve_index.append(i)
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url = None # remove the result if the HTTP Bing redirect raise an exception
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# append result
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results.append({'url': url, 'title': title, 'content': content})
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# resolve all Bing redirections in parallel
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request_list = [
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Request.get(u, allow_redirects=False, headers=resp.search_params['headers']) for u in url_to_resolve
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]
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response_list = multi_requests(request_list)
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for i, redirect_response in enumerate(response_list):
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if not isinstance(redirect_response, Exception):
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results[url_to_resolve_index[i]]['url'] = redirect_response.headers['location']
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# get number_of_results
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try:
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result_len_container = "".join(eval_xpath(dom, '//span[@class="sb_count"]//text()'))
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if "-" in result_len_container:
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@ -8,7 +8,8 @@ import concurrent.futures
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from queue import SimpleQueue
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from types import MethodType
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from timeit import default_timer
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from typing import Iterable, Tuple
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from typing import Iterable, NamedTuple, Tuple, List, Dict, Union
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from contextlib import contextmanager
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import httpx
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import anyio
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@ -48,9 +49,23 @@ def get_context_network():
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return THREADLOCAL.__dict__.get('network') or get_network()
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def request(method, url, **kwargs):
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"""same as requests/requests/api.py request(...)"""
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@contextmanager
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def _record_http_time():
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# pylint: disable=too-many-branches
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time_before_request = default_timer()
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start_time = getattr(THREADLOCAL, 'start_time', time_before_request)
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try:
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yield start_time
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finally:
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# update total_time.
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# See get_time_for_thread() and reset_time_for_thread()
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if hasattr(THREADLOCAL, 'total_time'):
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time_after_request = default_timer()
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THREADLOCAL.total_time += time_after_request - time_before_request
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def _get_timeout(start_time, kwargs):
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# pylint: disable=too-many-branches
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# timeout (httpx)
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if 'timeout' in kwargs:
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@ -65,45 +80,84 @@ def request(method, url, **kwargs):
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# ajdust actual timeout
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timeout += 0.2 # overhead
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start_time = getattr(THREADLOCAL, 'start_time', time_before_request)
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if start_time:
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timeout -= default_timer() - start_time
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# raise_for_error
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check_for_httperror = True
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if 'raise_for_httperror' in kwargs:
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check_for_httperror = kwargs['raise_for_httperror']
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del kwargs['raise_for_httperror']
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return timeout
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# requests compatibility
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if isinstance(url, bytes):
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url = url.decode()
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# network
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network = get_context_network()
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def request(method, url, **kwargs):
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"""same as requests/requests/api.py request(...)"""
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with _record_http_time() as start_time:
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network = get_context_network()
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timeout = _get_timeout(start_time, kwargs)
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future = asyncio.run_coroutine_threadsafe(network.request(method, url, **kwargs), get_loop())
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try:
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return future.result(timeout)
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except concurrent.futures.TimeoutError as e:
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raise httpx.TimeoutException('Timeout', request=None) from e
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# do request
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future = asyncio.run_coroutine_threadsafe(network.request(method, url, **kwargs), get_loop())
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try:
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response = future.result(timeout)
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except concurrent.futures.TimeoutError as e:
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raise httpx.TimeoutException('Timeout', request=None) from e
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# requests compatibility
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# see also https://www.python-httpx.org/compatibility/#checking-for-4xx5xx-responses
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response.ok = not response.is_error
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def multi_requests(request_list: List["Request"]) -> List[Union[httpx.Response, Exception]]:
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"""send multiple HTTP requests in parallel. Wait for all requests to finish."""
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with _record_http_time() as start_time:
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# send the requests
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network = get_context_network()
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loop = get_loop()
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future_list = []
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for request_desc in request_list:
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timeout = _get_timeout(start_time, request_desc.kwargs)
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future = asyncio.run_coroutine_threadsafe(
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network.request(request_desc.method, request_desc.url, **request_desc.kwargs), loop
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)
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future_list.append((future, timeout))
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# update total_time.
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# See get_time_for_thread() and reset_time_for_thread()
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if hasattr(THREADLOCAL, 'total_time'):
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time_after_request = default_timer()
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THREADLOCAL.total_time += time_after_request - time_before_request
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# read the responses
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responses = []
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for future, timeout in future_list:
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try:
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responses.append(future.result(timeout))
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except concurrent.futures.TimeoutError:
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responses.append(httpx.TimeoutException('Timeout', request=None))
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except Exception as e: # pylint: disable=broad-except
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responses.append(e)
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return responses
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# raise an exception
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if check_for_httperror:
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raise_for_httperror(response)
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return response
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class Request(NamedTuple):
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"""Request description for the multi_requests function"""
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method: str
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url: str
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kwargs: Dict[str, str] = {}
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@staticmethod
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def get(url, **kwargs):
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return Request('GET', url, kwargs)
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@staticmethod
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def options(url, **kwargs):
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return Request('OPTIONS', url, kwargs)
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@staticmethod
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def head(url, **kwargs):
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return Request('HEAD', url, kwargs)
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@staticmethod
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def post(url, **kwargs):
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return Request('POST', url, kwargs)
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@staticmethod
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def put(url, **kwargs):
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return Request('PUT', url, kwargs)
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@staticmethod
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def patch(url, **kwargs):
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return Request('PATCH', url, kwargs)
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@staticmethod
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def delete(url, **kwargs):
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return Request('DELETE', url, kwargs)
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def get(url, **kwargs):
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@ -13,6 +13,7 @@ import httpx
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from searx import logger, searx_debug
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from .client import new_client, get_loop, AsyncHTTPTransportNoHttp
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from .raise_for_httperror import raise_for_httperror
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logger = logger.getChild('network')
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@ -226,6 +227,27 @@ class Network:
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kwargs['follow_redirects'] = kwargs.pop('allow_redirects')
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return kwargs_clients
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@staticmethod
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def extract_do_raise_for_httperror(kwargs):
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do_raise_for_httperror = True
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if 'raise_for_httperror' in kwargs:
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do_raise_for_httperror = kwargs['raise_for_httperror']
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del kwargs['raise_for_httperror']
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return do_raise_for_httperror
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@staticmethod
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def patch_response(response, do_raise_for_httperror):
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if isinstance(response, httpx.Response):
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# requests compatibility (response is not streamed)
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# see also https://www.python-httpx.org/compatibility/#checking-for-4xx5xx-responses
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response.ok = not response.is_error
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# raise an exception
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if do_raise_for_httperror:
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raise_for_httperror(response)
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return response
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def is_valid_response(self, response):
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# pylint: disable=too-many-boolean-expressions
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if (
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@ -239,6 +261,7 @@ class Network:
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async def call_client(self, stream, method, url, **kwargs):
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retries = self.retries
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was_disconnected = False
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do_raise_for_httperror = Network.extract_do_raise_for_httperror(kwargs)
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kwargs_clients = Network.extract_kwargs_clients(kwargs)
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while retries >= 0: # pragma: no cover
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client = await self.get_client(**kwargs_clients)
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@ -248,7 +271,7 @@ class Network:
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else:
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response = await client.request(method, url, **kwargs)
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if self.is_valid_response(response) or retries <= 0:
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return response
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return Network.patch_response(response, do_raise_for_httperror)
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except httpx.RemoteProtocolError as e:
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if not was_disconnected:
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# the server has closed the connection:
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@ -141,28 +141,28 @@ class TestNetworkRequestRetries(SearxTestCase):
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async def test_retries_ok(self):
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with patch.object(httpx.AsyncClient, 'request', new=TestNetworkRequestRetries.get_response_404_then_200()):
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network = Network(enable_http=True, retries=1, retry_on_http_error=403)
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response = await network.request('GET', 'https://example.com/')
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response = await network.request('GET', 'https://example.com/', raise_for_httperror=False)
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self.assertEqual(response.text, TestNetworkRequestRetries.TEXT)
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await network.aclose()
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async def test_retries_fail_int(self):
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with patch.object(httpx.AsyncClient, 'request', new=TestNetworkRequestRetries.get_response_404_then_200()):
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network = Network(enable_http=True, retries=0, retry_on_http_error=403)
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response = await network.request('GET', 'https://example.com/')
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response = await network.request('GET', 'https://example.com/', raise_for_httperror=False)
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self.assertEqual(response.status_code, 403)
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await network.aclose()
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async def test_retries_fail_list(self):
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with patch.object(httpx.AsyncClient, 'request', new=TestNetworkRequestRetries.get_response_404_then_200()):
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network = Network(enable_http=True, retries=0, retry_on_http_error=[403, 429])
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response = await network.request('GET', 'https://example.com/')
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response = await network.request('GET', 'https://example.com/', raise_for_httperror=False)
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self.assertEqual(response.status_code, 403)
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await network.aclose()
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async def test_retries_fail_bool(self):
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with patch.object(httpx.AsyncClient, 'request', new=TestNetworkRequestRetries.get_response_404_then_200()):
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network = Network(enable_http=True, retries=0, retry_on_http_error=True)
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response = await network.request('GET', 'https://example.com/')
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response = await network.request('GET', 'https://example.com/', raise_for_httperror=False)
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self.assertEqual(response.status_code, 403)
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await network.aclose()
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@ -178,7 +178,7 @@ class TestNetworkRequestRetries(SearxTestCase):
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with patch.object(httpx.AsyncClient, 'request', new=get_response):
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network = Network(enable_http=True, retries=2)
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response = await network.request('GET', 'https://example.com/')
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response = await network.request('GET', 'https://example.com/', raise_for_httperror=False)
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self.assertEqual(response.status_code, 200)
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self.assertEqual(response.text, TestNetworkRequestRetries.TEXT)
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await network.aclose()
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@ -190,7 +190,7 @@ class TestNetworkRequestRetries(SearxTestCase):
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with patch.object(httpx.AsyncClient, 'request', new=get_response):
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network = Network(enable_http=True, retries=0)
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with self.assertRaises(httpx.RequestError):
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await network.request('GET', 'https://example.com/')
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await network.request('GET', 'https://example.com/', raise_for_httperror=False)
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await network.aclose()
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@ -237,6 +237,6 @@ class TestNetworkStreamRetries(SearxTestCase):
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with patch.object(httpx.AsyncClient, 'stream', new=stream):
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network = Network(enable_http=True, retries=0, retry_on_http_error=403)
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response = await network.stream('GET', 'https://example.com/')
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response = await network.stream('GET', 'https://example.com/', raise_for_httperror=False)
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self.assertEqual(response.status_code, 403)
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await network.aclose()
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