'rbuf_fill': execution expired (Timeout::Error)

2007-12-09 04:41:00 +0000

This is a fun little exception in Ruby that you have to catch explicitly in order to get hold of it in a rescue block.

Say you had the following:

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require 'net/pop3'
begin
  Net::POP3.auth_only(@server, @port, @username, @password)
rescue => e
  write_error_to_logfile(e)
  do_something_sensible
end

And the mail server could not be reached due to transient network problems -> that is, you are getting a socket timeout error.

Well, your code in the rescue block won’t get executed! Even though the script raises an Error!

Why is this?

Simple answer, because Timeout::Error is not a subclass of StandardError, it is a subclass of the Interrupt class.

So, that means you have to catch it explicitly, like so:

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require 'net/pop3'
begin
  Net::POP3.auth_only(@server, @port, @username, @password)
rescue => e
  write_error_to_logfile(e)
  do_something_sensible
rescue Timeout::Error => e
  write_error_to_logfile(e)
  do_something_sensible_for_timeout
end

And all will be good again, error caught!

blogLater

Mikel

  1. Bryn Thomas Says:
    2008-01-10 17:14:02 +0000

    Thanks, I had this same error and this cleared up my incorrect expectation that everything derived from a root Exception class.

  2. Roob Says:
    2008-08-25 23:20:00 +0000

    that was very helpful, thanks!

  3. dace Says:
    2008-02-20 02:14:41 +0000

    this was a huge help!

  4. Robert Aganauskas Says:
    2008-03-13 21:01:33 +0000

    Thanks, this error was really driving me crazy.

  5. Jarek Says:
    2008-06-12 20:23:40 +0000

    Thanks !

  6. Jan Rüegg Says:
    2008-02-29 14:43:10 +0000

    This was e great help to me too… Thanks a lot!

  7. Murali Says:
    2008-09-10 17:54:23 +0000

    Thanks. this saved my debugging time.

  8. Dirceu Jr. Says:
    2008-09-25 07:54:57 +0000

    Thx!!!

  9. Tudor Constantin Says:
    2008-12-06 07:06:08 +0000

    This was a great help. Small, concise, exactly what I needed. Thx alot

  10. Jon Says:
    2009-06-10 04:36:57 +0000

    Thanks! Found this on first google search, instantly fixed!

  11. Dan D Says:
    2009-07-06 15:57:55 +0000

    Thank you very much. But…. so lame…

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  15. John Says:
    2009-08-16 23:52:29 +0000

    You should not have a catch-all rescue anyway.

    “rescue => e” == EVIL.

  16. dubek Says:
    2009-08-17 03:16:19 +0000

    @Colin

    You don’t want to rescue Exception, because then even the syntax errors in your code will be rescued by the rescue clause.

    I still don’t understand why the Timeout exceptions aren’t a subclass of StandardError…

  17. Colin Curtin Says:
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    http://blog.nicksieger.com/articles/2006/09/06/rubys-exception-hierarchy

    Every exception derives from Exception, so you can do

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