Puppet users - Sep 2014 - Automatically cleaning up if a class/define is no longer used (related to purging unmanaged resources)

Hello,

I have a question about automatically cleaning configuration if the 
class/define that generated it is no longer used.

For example, I have a number of logging daemons that I would like to be 
able to disable automatically if their definitions are removed from the 
node's manifest:

node foo {
         # "bar" and "baz" are actually names of pre-define
logging
	# configurations statlog knows what to do with
	statlog { "bar":}
	statlog { "baz":}
}

This, basically, creates, starts, and enables (on boot) two new services 
"statlog.bar" and "statlog.baz". So far so good.

Now, because statlog can be resource-intensive, suppose I would like the 
statlog.baz service to be stopped and disabled automatically if I remove 
statlog { "baz":} from the manifest:

site.pp:
	node foo {
		statlog { "bar":}
	}

Since there are many possible "statlogs", I don't want to make
site.pp
messy by explicitly doing something like the following for every one.
site.pp:
	node foo {
		statlog { "bar":}
		statlog { "baz": purge => true}
	}

Here's roughly what I am thinking of doing (but I am wondering if there 
is a better way).

site.pp:
	# this is in global area of site.pp. so that all nodes, whether they
	# use statlog or not include this code
	class { "statlog::autocleanup":}

	node foo {
		statlog { "bar":}
	}

statlog module:
class statlog::autocleanup()
{
	# real implementation is a bit more complicated to handle
         # resource ordering, non-existent services, etc.
	if !defined(Service["statlog.baz"]) {
	        service{ "statlog.baz":
         	    ensure => stopped,
	            enable => false,
         	}
	}
	if !defined(Service["statlog.foo"]) {
	...
     }
}

Is there a better way to do this?



Thanks very much,

Vlad

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