[log4perl-devel] how to enable/disable appender in config file based on %ENV variable?

[David C. <dpc...@ho...>]

log4perl-devel:

I'm working on a web application and would like to log TRACE priority 
messages related to hits from my development machine (IP address 
192.168.0.34).  This is the relevant portion of my configuration file:

     2011-09-19 12:31:51 dpchrist@p43400e ~
     $ grep TraceApp perl-src/50-Dpchrist-CMS/demo/conf/log4perl.conf
     log4perl.logger = TRACE, InfoApp, TraceApp
     log4perl.appender.TraceApp = Log::Log4perl::Appender::File
     log4perl.appender.TraceApp.filename = sub { $ENV{REMOTE_ADDR} eq 
'192.168.0.34' ? $Mysite::CONF{-log_dir} . '/trace.log' : '/dev/null' }
     log4perl.appender.TraceApp.mode = append
     log4perl.appender.TraceApp.layout = PatternLayout
     log4perl.appender.TraceApp.layout.ConversionPattern = 
%d{yyyyMMdd-HHmmss.SSS} %p %M (%F{1} %L) %m{chomp}%n
     log4perl.appender.TraceApp.Threshold = TRACE


I would prefer to enable/ disable TraceApp based on $ENV{REMOTE_ADDR} 
rather than doing all the work and throwing non-192.168.0.34 hits down 
/dev/null, but I couldn't figure out how to implement this idea.


Is there a better way?


TIA,

David