using env vars in Log::Dispatch::Config config files

Grafne has asked for the wisdom of the Perl Monks concerning the following question:

First off I hope the title gives the correct info.

I am using Log::Dispatch to write log files but need to be able to set the name of the log file to have the hostname included.

I am currently using a conf file to configure log::dispatch::config->Log::Dispatch::Config->configure_and_watch($file).

The file looks like this 
dispatchers = file
# need to figure out how to generate name here..
file.class          = Log::Dispatch::File
file.min_level      = debug
file.filename       = log/${HOST}.log
file.mode           = append
file.size           = 102400
file.max            = 10
file.close_after_write = 1
file.format         = [%d] [%p] [%P:%L]%m %n
[download]

I cant figure out how to get it to set the filename using the $HOST env var.

any ideas?

Comment on using env vars in Log::Dispatch::Config config files Download Code

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Re: using env vars in Log::Dispatch::Config config files by roboticus (Chancellor) on Jun 19, 2012 at 16:38 UTC
Grafne: `print "$_:'$ENV{$_}'\n" for sort keys %ENV;` [download] ...roboticus When your only tool is a hammer, all problems look like your thumb.	[reply] [d/l]
Re^2: using env vars in Log::Dispatch::Config config files by Grafne (Initiate) on Jun 22, 2012 at 14:40 UTC
I am not sure what you mean? The data is stored in a config file. I could override this in my perl to over write the values in Log::Dispatch::Config->instance()->{'outputs'}->{'file'}->{'filename'} but this defeats the point of using the file. The intention is to allow users to edit the logger.conf file to change settings rather than having them hard coded. I am looking for a method of telling the log::dispatch::Config to use the env var to set the filename. I was hoping that the value read back from the file would be expanded when read and take the value of $HOST but instead the string is returned and I create a file called $host.log.	[reply]
Re^3: using env vars in Log::Dispatch::Config config files by roboticus (Chancellor) on Jun 22, 2012 at 16:00 UTC
Grafne: My bad. I interpreted your post as a "I can't get the environment variable" and I was showing how to access the environment variable hash. I didn't notice the part of your post when you're talking about reading it from a file. (I had thought that was a bit of the code you were having trouble with.) ...roboticus When your only tool is a hammer, all problems look like your thumb.	[reply]
Re: using env vars in Log::Dispatch::Config config files by toolic (Bishop) on Jun 22, 2012 at 15:03 UTC
I've never used it, but from the Log::Dispatch SYNOPSIS, it looks like you can set the filename in your Perl code: `my $log = Log::Dispatch->new( outputs => [ [ filename => "log/$ENV{HOST}.log" ], ], );` [download] Maybe you can set most of your parameters in the config file, and just this one in your Perl code.	[reply] [d/l]
Re^2: using env vars in Log::Dispatch::Config config files by Grafne (Initiate) on Jun 26, 2012 at 09:33 UTC
I am wondering if I can read back the filename, then expand it in my perl, then reassign it to the filename as you show above. I would like to set them all from the config file to keep things neat. Tidy code is good code ;-)	[reply]