system call timeout problem

rubyonrails-talk
1

Hallo,

I upgraded from rails 1.1.x to rails 1.2.x und the following error now occours. I do a system call, that transfers a file via lftp: `lftp -f #{dir}script` Which just executes lftp with a script file as a parameter. This works fine and the file transfer is executed correctly, but I now get after about 2000ms the following errors im my application:

In the Browser: the standard "rails application failed" error

In the error logs: SystemExit (exit):     /var/lib/gems/1.8/gems/rails-1.2.1/lib/fcgi_handler.rb:116:in `exit'     /var/lib/gems/1.8/gems/rails-1.2.1/lib/fcgi_handler.rb:116:in `exit_now_handler'     /var/lib/gems/1.8/gems/activesupport-1.4.0/lib/active_support/ inflector.rb:251:in `to_proc'     /var/lib/gems/1.8/gems/activesupport-1.4.0/lib/active_support/ core_ext/kernel/agnostics.rb:7:in `call'     /var/lib/gems/1.8/gems/activesupport-1.4.0/lib/active_support/ core_ext/kernel/agnostics.rb:7:in ``'     /var/lib/gems/1.8/gems/activesupport-1.4.0/lib/active_support/ core_ext/kernel/agnostics.rb:7:in ``'     /app/models/quikftp.rb:86:in `copyFile'     /app/controllers/quikftp_controller.rb:106:in `copyFile'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ base.rb:1095:in `send'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ base.rb:1095:in `perform_action_without_filters'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ filters.rb:632:in `call_filter'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ filters.rb:638:in `call_filter'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ filters.rb:438:in `call'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ filters.rb:637:in `call_filter'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ filters.rb:619:in `perform_action_without_benchmark'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ benchmarking.rb:66:in `perform_action_without_rescue'     /usr/lib/ruby/1.8/benchmark.rb:293:in `measure'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ benchmarking.rb:66:in `perform_action_without_rescue'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ rescue.rb:83:in `perform_action'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ base.rb:430:in `send'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ base.rb:430:in `process_without_filters'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ filters.rb:624:in `process_without_session_management_support'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ session_management.rb:114:in `process'     /var/lib/gems/1.8/gems/actionpack-1.13.1/lib/action_controller/ base.rb:330:in `process'     /var/lib/gems/1.8/gems/rails-1.2.1/lib/dispatcher.rb:41:in `dispatch'     /var/lib/gems/1.8/gems/rails-1.2.1/lib/fcgi_handler.rb:168:in `process_request'     /var/lib/gems/1.8/gems/rails-1.2.1/lib/fcgi_handler.rb:143:in `process_each_request!'     /var/lib/gems/1.8/gems/rails-1.2.1/lib/fcgi_handler.rb:109:in `with_signal_handler'     /var/lib/gems/1.8/gems/rails-1.2.1/lib/fcgi_handler.rb:142:in `process_each_request!'     /usr/lib/ruby/1.8/fcgi.rb:612:in `each_cgi'     /usr/lib/ruby/1.8/fcgi.rb:609:in `each'     /usr/lib/ruby/1.8/fcgi.rb:609:in `each_cgi'     /var/lib/gems/1.8/gems/rails-1.2.1/lib/fcgi_handler.rb:141:in `process_each_request!'     /var/lib/gems/1.8/gems/rails-1.2.1/lib/fcgi_handler.rb:55:in `process!'     /var/lib/gems/1.8/gems/rails-1.2.1/lib/fcgi_handler.rb:25:in `process!'     /home/arne/www/mpaiplus.com/http/back/public/dispatch.fcgi:24

Does anybody have an idia what this is about? Any help is strongly appreciated.

migo

2

Its extremely *insert your favorite profanity here* to do that. Rails work on the assumption that all your actions return/render fast and do not block. What your probably want is to offload this ftp thingy to a background process.

Most likely backgroundrb is suited for this kinda stuff. there is a seperate mailing list for backgroundrb, shoot a mail if you can't figure this out.

3

Thanks for the advice! the ftp transfer is actually called as an ajax function, so the application itself doesnt block (other ajax call check the progress on the ftp transfer). I will have a look at the backgroundrb stuff.