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Re: Config files in CPAN modules?

by blue_cowdawg (Prior)
on Jul 21, 2006 at 14:51 UTC ( #562878=note: print w/ replies, xml ) Need Help??


in reply to Config files in CPAN modules?

      So what's a good way to deal with this?

One way I've solved this for some modules for general use that I've authored for my job is to use XML::Simple to store my configs. If I have a program that is invoking a module that needs to get to a config file named "foo.pl" I simply create a file in the directory the script lives in called "foo.xml" and put the configuration information in there. For instance I have some database access modules that I use a lot and I store the information as such:

<disco_database> <host>database-host.foo.com</host> <dbname>disco</dbname> <user>disco</dbname> <password>duck</password> </disco_database>
in my xml file. The module s written to invoke XML::Simple thusly:
package my_package; use Class::DBI::Loader; use XML::Simple; | much handwaving... sub new { | more handwaving... my $config = new XMLIn(); $self->{loader} = Class::DBI::Loader -> new ( dsn => sprintf("dbi:%s:dbname=%s;host=%s", $config->{disco_database}->{driver}, $config->{disco_database]->{dbname}, $config->{disco_database}->{host}), user=>$config->{disco_database}->{user}, password=>$config->{disco_database}->{password} | and so forth...
This has the added bonus that if I have change any of the parameters that the script and its associated modules need to live on change I don't have to search through all the source code of the modules and script to change variables.

In other cases (and actually, the project I call "disco" is a good example of this) I put a config file that is central for that module. If I ever have to override it I make that a potential parameter for instantiating the module. For instance:

| blah blah... use IBM::Disco::HostEntry; | } | blah | | my $he = IBM::Disco::HostEntry->new{ config_file => qq(/path/to/file) ); |
When the module is instantiated it uses a default normally but when the parameter config_file is passed to the constructor I use that value instead.


Peter L. Berghold -- Unix Professional
Peter -at- Berghold -dot- Net; AOL IM redcowdawg Yahoo IM: blue_cowdawg


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