On Wed, Jun 15, 2016 at 12:24 PM, Walter Stovall <walter.stov...@byers.com>
wrote:
> My geoserver application needs to connect to potentially hundreds of
> different Oracle schemas. There is a workspace associated with each
> schema. My goal is to have a single connection pool that is shared by all
> of these workspaces.
>
>
>
> Andrea shared this URL which tends to point me in the right direction.
> http://docs.geoserver.org/latest/en/user/data/database/sqlsession.html#data-sqlsession
>
>
>
> The above solution allows for one DataStore to be shared by all of my
> workspaces, which is exactly what I need. *But this won’t work with the
> Oracle database.* Unfortunately Oracle does not support the SET SESSION
> AUTHORIZATION sql and apparently has no SQL-based equivalent.
>
Hi Walter,
the funny thing is, the impersonation was implemented exactly for Oracle,
and the example for postgresql was added later for documentation and
generality purposes.
The sponsor had a Oracle package (set of stored produces I believe?) that
allowed to setup the impersonation by SQL,
but I don't think it was anything standard.
>
>
> However, Oracle does have exactly what I need. The problem is that it
> can’t be accomplished by executing a SQL statement. Instead it requires a
> proprietary call to the JDBC driver.
>
>
>
> With Oracle, ‘impersonating’ a user is accomplished by creating a *proxy*
> connection. The basics of this are at
> http://docs.oracle.com/cd/B28359_01/java.111/b31224/proxya.htm#BABEJEIA.
> The idea is that basically you setup the connection pool based on a
> database user with minimal privilege and no meaningful default schema.
> Then you can borrow one of the connections in the pool and switch it so it
> now behaves as a connection to the user account you want to behave-as.
>
>
>
> Doing the equivalent of SET SESSION AUTHORIZATION is accomplished with a
> call to the Oracle driver oracle.jdbc.OracleConnection.openProxySession.
> And then when the connection is returned to the pool, an overload of the
> OracleConnection.close() method closes the proxy session while keeping the
> connection otherwise open.
>
>
>
> I’m looking for any comments you might have on how to extend the geoserver
> code to support this. Rather than hack the code for my own purposes I’d
> like to hope I might contribute a solution that gets rolled into the core
> product.
>
>
>
> Thanks in advance for any thoughts on how to implement this in geoserver.
> References to specific geoserver/geotools interfaces are appreciated!
>
I don't believe we have anything ready to be used, and guess some custom
changes to the Oracle store down in GeoTools is pretty much the
only approach. A new store parameter referring to the env variable that's
going to be used to pass down the user is likely a good approach, I guess
you can use
The code in question is in these two modules:
https://github.com/geotools/geotools/tree/master/modules/library/jdbc
https://github.com/geotools/geotools/tree/master/modules/plugin/jdbc/jdbc-oracle
You'll probably need to roll a new method in the SQLDialect interface to
allow creating a new connection from an existing one, too.
Cheers
Andrea
--
==
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==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
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