Dear devs,
GEOS-7614 "Allowing GeoServer to store property placeholders as templates
into the catalog",
and its related PR (https://github.com/geoserver/geoserver/pull/1663),
allow GeoServer to **optionally** make use of a placeholders on store,
services and GWC configurations.
This work is part of the GSIP 145 "Back-up and Restore Extension for
GeoServer Configuration" (
https://github.com/geoserver/geoserver/wiki/GSIP-145), and more PRs
touching the GeoServer core will follow soon.
In particular GEOS-7614 is related to this
https://github.com/geoserver/geoserver/wiki/GSIP-145#making-geoserver-configuration-easier-to-move-across-environments
*"The proposal is to allow GeoServer to handle placeholders in
configuration and replace them as needed with the provided input in order
to customize some portions of the configuration itself. The placeholders
would be configured in a separate file not subject to export/import (or
subject only on demand). The location where this file is placed will be
configurable also via an env variable similarly to how the GeoServer data
dir is setup (env variable, system variable, servlet context parameter).*
*Besides the datastores which already have a neat separation between what’s
stored and what’s used, with transformation in the middle, we’ll have to
add extra methods/parameters to get the expanded or unexpanded version of a
certain object.*
*Areas of work:*
-
*Expand variables in datastore configurations *
-
*Expand variables in service configurations *
-
*Expand variables in selected security subsystem bits *
-
*Expand variables in GWC disk quota configurations *
*The basic idea is to have a singleton, loaded at initialization time, able
to transform placeholders defined by the user into real values and vice
versa."*
It is worth to highlight that even if the PR touches a lot of GeoServer
modules it is not invasive. If the environment variable
"ALLOW_ENV_PARAMETRIZATION" is absent or set to false everything is exactly
the same, all the code for parametrization is ignored and GeoServer works
exactly as if the PR is absent.
Two last things to say:
1. In order to work correctly and compile this PR requires also a
GeoWebCache PR (https://github.com/GeoWebCache/geowebcache/pull/399)
allowing GWC to read environment properties injected from outisde the same
way GeoServer does.
2. As part of the same work will follow at least two other *core* PRs; the
first one will introduce some new interfaces for the services allowing
plugins and external modules to force configuration reload or storage
without knowing anything about GeoServer extensions except their interface.
The second one will allow the GeoServer GUI to present a "Server Busy Page"
to the user but still allowing him to navigate the read-only/anonymous
pages when write-locking the configuration instead of block the whole
server.
Best Regards,
Alessio Fabiani.
==
GeoServer Professional Services from the experts!
Visit http://goo.gl/it488V for more information.
==
Ing. Alessio Fabiani
@alfa7691
Founder/Technical Lead
GeoSolutions S.A.S.
Via di Montramito 3/A
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 331 6233686
http://www.geo-solutions.it
http://twitter.com/geosolutions_it
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