From: fw <fwmailinglists@...>
Date: 2008-01-30T11:08:30+09:00
Subject: Re: smtp.set_debug_output - capture output to string?

On Wed, 2008-01-30 at 10:49 +0900, aktxyz@gmail.com wrote: 
> On Jan 29, 7:31 pm, "akt...@gmail.com" <akt...@gmail.com> wrote:
> > As shown below, I can send debug output from Net::SMTP to stderr, how
> > to I send this to a string instead?
> >
> > smtp = Net::SMTP.new(x[:address], x[:port])
> > smtp.set_debug_output $stderr
> > smtp.start(x[:domain], x[:user_name], x[:password],
> > x[:authentication]) do |smtp|
> >   smtp.sendmail(mail.encoded, mail.from, mail.destinations)
> > end
> 
> fyi, this StringIO technique does not work...
> 
> smtp = Net::SMTP.new(x[:address], x[:port])
> s = StringIO.new
> smtp.set_debug_output s
> smtp.start(x[:domain], x[:user_name], x[:password],
> x[:authentication]) do |smtp|
>   smtp.sendmail(mail.encoded, mail.from, mail.destinations)
> end
> s.rewind
> pp s.readlines
> 
> 

Works for me:

$ irb
irb(main):001:0> require 'net/smtp'
=> true
irb(main):002:0> require 'stringio'
=> true
irb(main):003:0> a = StringIO.new
=> #<StringIO:0xb7cfa7e4>
irb(main):004:0> s = Net::SMTP.new('zonkalicious.org', 587)
=> #<Net::SMTP zonkalicious.org:587 started=false>
irb(main):005:0> s.set_debug_output a
=> #<StringIO:0xb7cfa7e4>
irb(main):006:0> s.start('nowhere.com', 'nouser', 'nopass')
Errno::ECONNREFUSED: Connection refused - connect(2)
[ ... error trace snipped for brevity ... ]
irb(main):007:0> a.string
=> "opening connection to zonkalicious.org...\n"
irb(main):008:0> 


Ignoring the error for a connection refused because I'm using bogus
login data, it does capture debug output to the StringIO object.

HTH,

Felix