如何捕获splash:on_response重试错误和项目?

时间:2017-06-29 01:33:09

标签: lua scrapy splash scrapy-splash

我正在使用scrapy,splash和scrapy_splash来抓取目录网站。

网站使用表单POST打开新项目详细信息页面。

有时,项目详细信息页面会在Splash中显示默认错误页面(与HTTP状态无关),但如果我再次重新发布表单,则会返回项目详细信息。我仍在调查回应的根本原因。在n个请求之后,它似乎更像是一个计时问题而不是特定的检查。

作为一种解决方法,我使用splash:on_response方法在收到错误页面时重试表单发布。

我希望能够记录失败的尝试以便稍后进行手动处理。是否有收集此信息的最佳做法或标准方法?

function main(splash)
    if splash.args.cookies then
        splash:init_cookies(splash.args.cookies)
    end   

    function web_request()
        if splash.args.http_method == 'GET' then            
            assert(splash:go{
                url=splash.args.url,
                headers=splash.args.headers,
                http_method=splash.args.http_method,
                body=splash.args.body,
            })
        else
            assert(splash:go{
                url=splash.args.url,
                headers=splash.args.headers,
                http_method=splash.args.http_method,
                body=splash.args.body,
                formdata=splash.args.formdata,
             })
        end
    end

    --- AREA OF THE CODE UNDER QUESTION
    local retry_max = 3
    local retry_count = 0
    splash:on_response(function (response)
        if string.find(response.url, 'error_check.html') ~= nil then
            if retry_count <= retry_max then
                retry_count = retry_count + 1
                web_request()
            else
                --- Not sure how to capture this in the item pipeline
                --- Also, I would like to capture the form post details
                --- such as the form data and headers
                error('Max retry exceeded' .. response)
            end
        end
    end)

    web_request()
    assert(splash:wait(0.5))

    local entries = splash:history()
    local last_response = entries[#entries].response

    return {
        url = splash:url(),
        headers = last_response.headers,
        http_status = last_response.status,
        cookies = splash:get_cookies(),
        html = splash:html(),
        har = splash:har(),
        retry_count = retry_count
    }
end

0 个答案:

没有答案