Iñaki Baz Castillo <[email protected]> wrote:
> El Domingo, 3 de Enero de 2010, Eric Wong escribió:
>
> > # Totally untested, stick this in your Unicorn config file and let
> > # us know if it works or blows up badly:
> >
> > require 'syslog_logger'
> >
> > class MySyslogLogger < SyslogLogger
> > alias puts error
> > alias write error
> > def flush; self; end
> > end
> >
> > $stderr = MySyslogLogger.new('foo')
>
> Unfortunatelly it doesn'w work very well. First of all Sysloglogger relies on
> a constant called SYSLOG created in "initialize" method so it's required to
> add the above methods to SyslogLogger class rather than subclass.
>
> Anyhow, the main problem is that by doing "$stderr = SyslogLogger.new('foo')"
> the std error is not redirected as /proc/PID/fd still shows:
>
> 2 -> /dev/pts/2
Yup, that's expected. _Assigning_ $stderr does not do a redirect at the
OS-level, only at th Ruby level (sufficient for env["rack.errors"],
Kernel#warn).
> Of course by calling $stderr.puts "error" the above works, but when a real
> error raised it's is printed in the screen (/dev/pts/2).
> I strongly think that IO#reopen is required. IO#reopen accepts a string (file
> path) or other IO, so "converting" SyslogLogger into a IO is required.
>
> I'll try to achieve it.
Yes, you need to do something that'll dup()/dup2() internally like
IO#reopen to replace fd=2. But when you have the raw file descriptor,
you won't get syslog formatting...
The only way I can think of is to redirect fd=2 to the stdin of a
separate process to add formatting in...
r, w = IO.pipe
fork {
$stdin.reopen(r)
w.close
exec('ruby', '-rsyslog', '-ane',
'BEGIN{Syslog.open("foo")}; Syslog.warning $_')
}
r.close
$stderr.reopen(w)
Not pretty...
--
Eric Wong
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