我有一个包含数千URL
个数据库的数据库,我使用一个蜘蛛进行搜索。例如,100 URL
可以具有相同的域:
http://notsame.com/1
http://notsame2.com/1
http://dom.com/1
http://dom.com/2
http://dom.com/3
...
问题是有时网页/域名什么都没有返回,所以我得到了<twisted.python.failure.Failure twisted.internet.error.TimeoutError: User timeout caused connection failure:
。对于域的所有URL
,这是相同的。
我想检测Timeout,例如同一个域的5个网址,然后如果我确定此主机有问题,请避免再次请求此域并直接引发<twisted.python.failure.Failure twisted.internet.error.TimeoutError: User timeout caused connection failure:
有可能吗?如果是,怎么样?
修改
我的想法(用rrschmidt的帮助编辑):
class TimeoutProcessMiddleware:
_timeouted_domains = set()
def process_request(request,spider):
domain = get_domain(request.url)
if domain in _timeouted_domains:
return twisted.internet.error.TimeoutError
return request
def process_response(request, exception, spider):
# left out the code for counting timeouts for clarity
if is_timeout_exception(exception):
self._timeouted_domains.add(get_domain(request.url))
答案 0 :(得分:0)
您正在构建var data = {
"directed": false,
"graph": {},
"nodes": [{"id": 0}, {"id": 1}, {"id": 2}, {"id": 3}, {"id": 4}, {"id": 5},
{"id": 6}, {"id": 7}, {"id": 8}, {"id": 9}, {"id": 10}, {"id": 11}, {"id": 12}],
"links": [{"source": 0, "target": 0}, {"source": 1, "target": 1},
{"source": 2, "target": 2}, {"source": 3, "target": 3},
{"source": 4, "target": 4}, {"source": 5, "target": 5},
{"source": 6, "target": 6}, {"source": 7, "target": 8},
{"source": 7, "target": 9}, {"source": 7, "target": 10},
{"source": 7, "target": 11}, {"source": 7, "target": 7},
{"source": 8, "target": 8}, {"source": 9, "target": 9},
{"source": 10, "target": 10}, {"source": 11, "target": 11},
{"source": 12, "target": 12}],
"multigraph": false
};
let filteredNodes = data.nodes.filter(
function(n) { return this.has(n.id); },
data.links.reduce((set, {source:s, target:t}) =>
s !== t ? set.add(s).add(t) : set,
new Set()
)
);
console.log(filteredNodes);
的想法。更具体地说,我会将其构建为下载中间件。
下载器中间件可以触摸每个传出请求以及每个传入的响应......并且......它还可以处理在处理请求/响应时弹出的每个异常。详情:https://doc.scrapy.org/en/latest/topics/downloader-middleware.html
所以我会做什么(在未经测试的要点中,可能需要一些微调):
TimeoutProcessMiddleware