"""
Download timeout middleware
See documentation in docs/topics/downloader-middleware.rst
"""
from __future__ import annotations
from typing import TYPE_CHECKING, Union
from scrapy import Request, Spider, signals
from scrapy.crawler import Crawler
from scrapy.http import Response
if TYPE_CHECKING:
# typing.Self requires Python 3.11
from typing_extensions import Self
[docs]class DownloadTimeoutMiddleware:
def __init__(self, timeout: float = 180):
self._timeout: float = timeout
@classmethod
def from_crawler(cls, crawler: Crawler) -> Self:
o = cls(crawler.settings.getfloat("DOWNLOAD_TIMEOUT"))
crawler.signals.connect(o.spider_opened, signal=signals.spider_opened)
return o
def spider_opened(self, spider: Spider) -> None:
self._timeout = getattr(spider, "download_timeout", self._timeout)
def process_request(
self, request: Request, spider: Spider
) -> Union[Request, Response, None]:
if self._timeout:
request.meta.setdefault("download_timeout", self._timeout)
return None