On 11/03/2011 01:22 AM, Jay Dobies wrote:
http://blog.pulpproject.org/2011/11/02/preview-creating-a-pulp-plugin/
I wrote up the first in a series of posts that talks about creating Pulp
v2.0 plugins for anyone who wants to be on the bleeding edge of Pulp
stuff. I still need to write up a description of the REST APIs to
actually use it, but this should be enough to get anyone started who
wants to play with writing a plugin.
That generally looks like a good fit with what we want to do in
PulpDist, but I'm not sold on the idea of actually having to import and
run Python code in order to get at the importer and distributor
metadata, nor on the requirement to install (or symlink) Python code
into a /var subdirectory to get the plugins to work.
Rather than a dedicated directory for the actual plugin code, have you
considered a JSON based configuration model along the following lines
(closer to the existing interface for the content type definitions):
{"importers": [
{
"id" : "sync-tree",
"display_name" : "Directory tree importer",
"types" : ["file"],
"plugin" : "pulpdist.pulp_plugins.TreeImporter"
},
{
"id" : "sync-versioned-tree",
"display_name" : "Directory tree importer (multiple
independently updated versions)",
"types" : ["file"],
"plugin" : "pulpdist.pulp_plugins.VersionedTreeImporter"
},
{
"id" : "sync-snapshot-tree",
"display_name" : "Directory tree importer (sequentially
released versions)",
"types" : ["file"],
"plugin" : "pulpdist.pulp_plugins.SnapshotTreeImporter"
},
{
"id" : "sync-snapshot-delta",
"display_name" : "Rsync delta generator (sequentially
released versions)",
"types" : ["rsync-delta"],
"plugin" : "pulpdist.pulp_plugins.SnapshotDeltaImporter"
},
{
"id" : "sync-delta-tree",
"display_name" : "Directory tree importer (sequentially
released versions based on rsync delta files)",
"types" : ["file"],
"plugin" : "pulpdist.pulp_plugins.DeltaTreeImporter"
}
]}
And then in a separate file in the distributors directory:
{"distributors": [
{
"id" : "publish-delta",
"display_name" : "Rsync delta publisher",
"types" : ["rsync-delta"],
"plugin" : "pulpdist.pulp_plugins.DeltaDistributor"
}
]}
The key changes would be to move the metadata out into static JSON
files, and then include a "plugin" field in the metadata that tells Pulp
where to find the actual Python class implementing the plugin. That way,
all the restrictions on naming and file locations for plugins can go
away (aside from the usual Python namespace rules) and the deployment
model becomes simply:
- install your Python package (including any Pulp plugins)
- add JSON for new content types to /v/l/p/plugins/types
- add JSON for new importers to /v/l/p/plugins/importers
- add JSON for new distributors to /v/l/p/plugins/distributors
Cheers,
Nick.
--
Nick Coghlan
Red Hat Engineering Operations, Brisbane
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