太多連接重置異常錯誤 - Ruby 中的機械化

Question

我在 Ruby 上使用 Mechanize 並不斷收到此異常錯誤

C:/Ruby200/lib/ruby/2.0.0/net/protocol.rb:158:in `rescue in rbuf_fill': too many connection resets (due to Net::ReadTimeout - Net::ReadTimeout) after 0 requests on 37920120, last used 1457465950.371121 seconds ago (Net::HTTP::Persistent::Error)
    from C:/Ruby200/lib/ruby/2.0.0/net/protocol.rb:152:in `rbuf_fill'
    from C:/Ruby200/lib/ruby/2.0.0/net/protocol.rb:134:in `readuntil'
    from C:/Ruby200/lib/ruby/2.0.0/net/protocol.rb:144:in `readline'
    from C:/Ruby200/lib/ruby/2.0.0/net/http/response.rb:39:in `read_status_line'
    from C:/Ruby200/lib/ruby/2.0.0/net/http/response.rb:28:in `read_new'
    from C:/Ruby200/lib/ruby/2.0.0/net/http.rb:1406:in `block in transport_request'
    from C:/Ruby200/lib/ruby/2.0.0/net/http.rb:1403:in `catch'
    from C:/Ruby200/lib/ruby/2.0.0/net/http.rb:1403:in `transport_request'
    from C:/Ruby200/lib/ruby/2.0.0/net/http.rb:1376:in `request'
    from C:/Ruby200/lib/ruby/gems/2.0.0/gems/rest-client-1.6.7/lib/restclient/net_http_ext.rb:51:in `request'
    from C:/Ruby200/lib/ruby/gems/2.0.0/gems/net-http-persistent-2.9/lib/net/http/persistent.rb:986:in `request'
    from C:/Ruby200/lib/ruby/gems/2.0.0/gems/mechanize-2.7.3/lib/mechanize/http/agent.rb:259:in `fetch'
    from C:/Ruby200/lib/ruby/gems/2.0.0/gems/mechanize-2.7.3/lib/mechanize.rb:1281:in `post_form'
    from C:/Ruby200/lib/ruby/gems/2.0.0/gems/mechanize-2.7.3/lib/mechanize.rb:548:in `submit'
    from C:/Users/Feshaq/workspace/ERISScrap/eca_sample/eca_on_scraper.rb:152:in `<main>'

這是第 152 行：

#Click the form button
agent.page.forms[0].click_button

或者，我嘗試了給定的代碼段並不斷收到異常錯誤：

#get the form
form = agent.page.form_with(:name => "AdvancedSearchForm")
# get the button you want from the form
button = form.button_with(:value => "Search")
# submit the form using that button
agent.submit(form, button)

任何幫助表示贊賞

Answer 1

我已經多次遇到這個問題。 我處理它的方法是將運行刮刀的代碼塊包裝在一個救援子句中，如果出錯，我只需終止連接並重置代理及其標頭。 這在 100% 的時間里都有效，並且沒有給我帶來任何問題。 然后我繼續我在代碼中離開的地方。 下面的示例是我運行的爬蟲程序，用於遍歷建築物列表和查找頁面等：

def begin_scraping_list
    Building.all.each do |building_info|
      begin          
      next if convert_boroughs_for_form(building_info) == :no_good
      fill_in_first_page_address_form_and_submit(building_info)
      get_to_proper_second_page
      go_to_page_we_want_for_scraping
      scrape_the_table(building_info)
      rescue
        puts "error happened"
        @agent.shutdown
        @agent = Mechanize.new { |agent| agent.user_agent_alias = 'Windows Chrome'}
        @agent.request_headers
        sleep(5)
        redo
      end
    end
  end

因此，在您的情況下，您希望將您發布的問題區域包裝在救援塊中

  begin
    #get the form
    form = agent.page.form_with(:name => "AdvancedSearchForm")
    # get the button you want from the form
    button = form.button_with(:value => "Search")
    # submit the form using that button
    agent.submit(form, button)
    rescue
     agent.shutdown
     agent = Mechanize.new { |agent| agent.user_agent_alias = 'Windows Chrome'}
     agent.request_headers
     sleep(2)
     #get the form
     form = agent.page.form_with(:name => "AdvancedSearchForm")
     # get the button you want from the form
     button = form.button_with(:value => "Search")
     # submit the form using that button
     agent.submit(form, button)
   end

注意如果機械化導致了問題，而您還沒有對其進行大量投資，那么使用水豚和 phantomjs 將獲得更好的抓取體驗。 更成熟，更發達。 在它后面。