On 16/04/18 23:13, Trevor Vaughan wrote:
I thought there were dangers with Virtual Resource being accidentally
realized sometimes?
Not without users doing something bad (like realizing all) - puppet
itself does not realize virtual resources willy-nilly.
We found a super-hacky way to call functions at the end of a compile
which we use in
https://github.com/simp/pupmod-simp-compliance_markup/blob/master/manifests/map.pp.
It would be *really nice* if there were an actual 'hook in here, no
resources will be processed after this point' hook.
What if the logic called "after all resources processed" creates new or
modifies existing resources? Also, should it run after
collection/overrides or before?
- henrik
Trevor
On Mon, Apr 16, 2018 at 5:00 PM, Henrik Lindberg
<henrik.lindb...@puppet.com <mailto:henrik.lindb...@puppet.com>> wrote:
On 16/04/18 17:38, Trevor Vaughan wrote:
How difficult would it be to create a third type of resource
which is an 'ephemeral resource' whose only purpose is data
collection on a host to be used by some other collector?
These items would not be part of the catalog or added to the
graph but would instead just hang around for reference during
compilation.
This would fix the catalog explosion issue when you start doing
exported resources based on large numbers of things and/or
things like firewall rules and copious file_line resources.
Basically, a 'data' -> 'collector' pattern where you can
optimize...well...everything into a MUCH smaller catalog that is
sent to the client for processing.
Sounds a bit like the existing virtual resources, but with a better
collection mechanism. Would not be too difficult to write a function
that takes a data type predicate to match against virtual resources
data type predicate) and then calling a lambda with each.
Virtual resources do not end up in the catalog unless they are realized.
With the function I imagined, you would select virtual resources and
then do whatever you want in the lambda.
The function should probably return an Iterator over the resources.
That can then be iterated with each, map, or reduce.
The issue then is when to call that function - you want it at the
very end which we do not have a mechanism for.
The virtual collector could be modified to accept a lambda - since
collection runs late it would be at the right time. This is a much
bigger change naturally as it changes the language.
- henrik
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