[Pgpool-hackers] First pcp command as PostgreSQL function

[Tatsuo Ishii]

> Hello,
> 
> Following our previous discussions I created a PostgreSQL contrib module
> which brings pgpool's pcp command as function in PostgreSQL. I called it
> pgpool_adm, any better ideas ?

Great! I think "pgpool_adm" is fine.

> As a first step, I decided to focus on one function only: pcp_node_info.
> I'll add other ones as soon as this one will be committable.

I see. BTW, are you going to implement a function for "show
pool_status"?

> INSTALL: (tested against current 9.1devel HEAD)
> 
>   $ cd $PGSRC/contrib
>   $ tar zxf pgpool_adm.tgz
>   $ cd pgpool_adm
>   $ make && sudo make install
> 
> then:
> 
>   $ psql pgpool
>   CREATE SCHEMA pgpool;
>   CREATE EXTENSION pgpool_adm WITH SCHEMA pgpool ;
>   SELECT * FROM pgpool.pcp_node_info(0, 'localhost', 10, 9898,
> 'pgpool_adm', 'password');
>      host    | port |             status              |   weight
>   -----------+------+---------------------------------+-------------
>    localhost | 5491 | Waiting for connection to start | 1.46602e+13
>   (1 ligne)
> 
> If you don't want/cannot test with 9.1, just adapt and run the "CREATE
> FUNCTION" query located in pgpool_adm/pgpool_adm--1.0.sql.
> 
> NOTE:
> I had to mess a bit to make the compilation work out of the box because
> of my setup of pgpool installing stuffs in /usr/local/{lib,include}.
> Basically editing my system ldd setup and configuring postgresql with
> "--with-libraries" and "--with-includes". Drop me a mail if you have any
> trouble.
> 
> TODO:
>   * I will try to make it work with foreign server and user mappings so
> we will not have to give all servers parameters (host, port, timeout),
> but most importantly, not have to write in clear text authentication
> parameters.
>   * Why do we backend_weight/RAND_MAX in the code ?

To normalize backend weight.

> Feedback & comments ?
> - -- 
> Jehan-Guillaume (ioguix) de Rorthais
> DBA
> http://www.dalibo.com
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