调整Nokogiri连接的超时

Question

为什么nokogiri在服务器繁忙时等待几秒钟(3-5)并且我逐个请求页面,但是当这些请求处于循环中时,nokogiri不会等待并抛出超时消息.我正在使用超时阻止包裹请求,但nokogiri根本不等待那个时间.有关此的任何建议程序？

# this is a method from the eng class
def get_page(url,page_type)
 begin
  timeout(10) do
    # Get a Nokogiri::HTML::Document for the page we’re interested in...
    @@doc = Nokogiri::HTML(open(url))
  end
 rescue Timeout::Error
  puts "Time out connection request"
  raise
  end
end

 # this is a snippet from the main app calling eng class
 # receives a hash with urls and goes throgh asking one by one
 def retrieve_in_loop(links)
  (0..links.length).each do |idx|
    url = links[idx]
    puts "Visiting link #{idx} of #{links.length}"
    puts "link: #{url}"
    begin
        @@eng.get_page(url, product)
    rescue Exception => e
        puts "Error getting url: #{idx} #{url}"
        puts "This link will be skeeped. Continuing with next one"
    end
  end
end

Answer 1

该timeout块只是该代码必须在块内执行而不触发异常的最长时间.它不会影响Nokogiri或OpenURI内部的任何内容.

您可以将超时设置为一年,但OpenURI仍可以随时超时.

所以你的问题很可能是OpenURI在连接尝试本身时超时.Nokogiri没有超时; 它只是一个解析器.

调整读取超时

您可以在OpenURI上调整的唯一超时是读取超时.您似乎无法通过此方法更改连接超时:

open(url, :read_timeout => 10)

调整连接超时

要调整连接超时,您必须Net::HTTP直接使用:

uri = URI.parse(url)

http = Net::HTTP.new(uri.host, uri.port)
http.open_timeout = 10
http.read_timeout = 10

response = http.get(uri.path)

Nokogiri.parse(response.body)

您还可以在此处查看其他一些讨论:

Ruby Net :: HTTP超时
增加Net :: HTTP的超时