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Silent ruby ​​/ rails crash causes it to consume all memory and crash the server

I have a very strange error that I need to be aware of. Consider this:

class ApplicationController < ActionController::Base
  before_filter :set_timezone

  def set_timezone
    if logged_in?
      Time.zone = current_user.time_zone
    end
  end

When PayPal tries to send a notification, it comes up like this:

Started POST "/ipn_subscription_notifications" for 173.0.82.126 at 2012-03-15 04:11:45 -0400
  Processing by IpnSubscriptionNotificationsController#create as HTML
  Parameters: {"txn_type"=>"subscr_signup", etc...

And here he was hanged. Ruby starts chewing on memory until the machine crashes. This is the fix:

def set_timezone
  if current_user
    Time.zone = current_user.time_zone
  end
end

Let's look at logged_in?

:

module AuthenticatedSystem
  def logged_in?
    current_user ? true : false
  end

Which is logically equivalent to a fix.

I suspect the error is being thrown and broken and someone is restarting the request process. AuthenticatedSystem

is definitely suspected.

This doesn't happen in the development environment, it throws an error and returns 500:

Started POST "/ipn_subscription_notifications" for 127.0.0.1 at 2012-03-15 15:19:39 -0700
  Processing by IpnSubscriptionNotificationsController#create as */*
  Parameters: {"foobar"=>nil}
Completed 500 Internal Server Error in 9ms

NoMethodError (undefined method `logged_in?' for #<IpnSubscriptionNotificationsController:0xdfdaaf4>):
  app/controllers/application_controller.rb:8:in `set_timezone'

Rendered /usr/local/rvm/gems/ruby-1.9.2-p180@ce2/gems/actionpack-3.1.0/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.3ms)
Rendered /usr/local/rvm/gems/ruby-1.9.2-p180@ce2/gems/actionpack-3.1.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.0ms)
Rendered /usr/local/rvm/gems/ruby-1.9.2-p180@ce2/gems/actionpack-3.1.0/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (4.8ms)
[2012-03-15 15:19:40] ERROR Errno::ECONNRESET: Connection reset by peer
  /usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/webrick/httpserver.rb:56:in `eof?'
  /usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/webrick/httpserver.rb:56:in `run'
  /usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'

Detecting such failures and handling them gracefully is my goal.

Any ideas? Can I use Passenger or some other part of the Rails stack?

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2 answers


error undefined method logged_in? in your IpnSubscriptionNotificationsController and that controller inherits from ApplicationController, sure to include AuthenticatedSystem module in your ApplicationController, maybe you can try this first



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This may not solve your problem, but you should use round_filter: set_timezone instead of filter. Take a look at this: http://www.elabs.se/blog/36-working-with-time-zones-in-ruby-on-rails#working_with_multiple_user_time_zones



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