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comp.lang.ruby

Re: Backtrace without skips needed

Nathaniel Talbott

11/26/2003 12:04:00 PM

Tobias Peters [mailto:tpeters@invalid.uni-oldenburg.de] wrote:

> Is there a way to tell ruby that it must never skip levels in the
> backtrace like this:
>
> /lib/ruby/1.8/net/ftp.rb:192:in `readline': End of file
> reached (EOFError)
> from /lib/ruby/1.8/net/ftp.rb:192:in `getline'
> from /lib/ruby/1.8/net/ftp.rb:202:in `getmultiline'
> from /lib/ruby/1.8/net/ftp.rb:216:in `getresp'
> from /lib/ruby/1.8/net/ftp.rb:232:in `voidresp'
> from /lib/ruby/1.8/net/ftp.rb:157:in `connect'
> from /lib/ruby/1.8/net/ftp.rb:155:in `synchronize'
> from /lib/ruby/1.8/net/ftp.rb:158:in `connect'
> from /lib/ruby/1.8/net/ftp.rb:119:in `initialize'
> ... 7 levels...
> from getp.rb:85:in `get_from'
> from getp.rb:85:in `open'
> from getp.rb:85:in `get_from'
> from getp.rb:120
>
> This is the backtrace the ruby interpreter prints out when it
> terminates due to an unhandled exception.

See http://www.ruby-talk... and following. Basically it comes down
to, you have to wrap your code in an exception handler if you want all the
information, like so:

require 'pp'
begin
... all your code ...
rescue Exception => e
pp e.message
pp e.class
pp e.backtrace
end

I've used pp here, because it should give a much more readable printout of
the backtrace with minimal work.

HTH,


Nathaniel

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