如何解决超时问题(Ruby、Rails) [英] How to rescue timeout issues (Ruby, Rails)

问题描述

我的大多数应用都与网络服务有很大关系，而且经常由于第三方网站而导致超时问题.

most of my apps have a lot to do with web services and often due to the third party site, I get timeout issues.

这是我得到的错误:

  execution expired
  /usr/lib/ruby/1.8/timeout.rb:54:in `rbuf_fill'

如何在 Rails 应用中挽救这种错误?

How do I rescue this kind of error in a rails app?

推荐答案

根据您使用库的方式，有不同的方法可以挽救异常.

Depending on how you use the library, there are different ways to rescue the exception.

在图书馆

假设您创建了一个包装器来访问某种 Web 服务，您可以让包装器挽救异常并始终返回安全"数据.

Assuming you created a wrapper to access some kind of web service, you can have the wrapper rescue the exception and always return a "safe" data.

在行动

如果在action中调用了特定的方法，并且方法成功是action的要求，那么就可以在action中进行rescue.在下面的示例中，我修复了错误并显示了一个特定的模板来处理该问题.

If you call a specific method in the action and the method success is a requirement for the action, then you can rescue it in the action. In the following example I rescue the error and show a specific template to handle the problem.

def action
  perform_external_call
rescue Timeout::Error => e
  @error = e
  render :action => "error"
end

在控制器中

如果方法调用可以发生在许多不同的操作中，您可能需要使用 rescue_from.

If the method call can occur in many different actions, you might want to use rescue_from.

class TheController < ApplicationController

  rescue_from Timeout::Error, :with => :rescue_from_timeout

  protected

  def rescue_from_timeout(exception)
    # code to handle the issue
  end

end

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