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postgres_fdw: Allow application_name of remote connection to be set via GUC.

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This commit adds postgres_fdw.application_name GUC which specifies
a value for application_name configuration parameter used
when postgres_fdw establishes a connection to a foreign server.
This GUC setting always overrides application_name option of
the foreign server object. This GUC is useful when we want to
specify our own application_name per remote connection.

Previously application_name of a remote connection could be set
basically only via options of a server object. But which meant that
every session connecting to the same foreign server basically
should use the same application_name. Also if we want to change
the setting, we had to execute "ALTER SERVER ... OPTIONS ..." command.
It was inconvenient.

Author: Hayato Kuroda
Reviewed-by: Masahiro Ikeda, Fujii Masao
Discussion: https://postgr.es/m/TYCPR01MB5870D1E8B949DAF6D3B84E02F5F29@TYCPR01MB5870.jpnprd01.prod.outlook.com
This commit is contained in:
Fujii Masao
2021-09-07 12:27:30 +09:00
parent 4c3478859b
commit 449ab63505
6 changed files with 199 additions and 5 deletions
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35
contrib/postgres_fdw/option.c
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@ -1,7 +1,7 @@
/*-------------------------------------------------------------------------
*
* option.c
* FDW option handling for postgres_fdw
* FDW and GUC option handling for postgres_fdw
*
* Portions Copyright (c) 2012-2021, PostgreSQL Global Development Group
*
@ -45,6 +45,13 @@ static PgFdwOption *postgres_fdw_options;
*/
static PQconninfoOption *libpq_options;
/*
* GUC parameters
*/
char *pgfdw_application_name = NULL;
void _PG_init(void);
/*
* Helper functions
*/
@ -435,3 +442,29 @@ ExtractExtensionList(const char *extensionsString, bool warnOnMissing)
list_free(extlist);
return extensionOids;
}
/*
* Module load callback
*/
void
_PG_init(void)
{
/*
* Unlike application_name GUC, don't set GUC_IS_NAME flag nor check_hook
* to allow postgres_fdw.application_name to be any string more than
* NAMEDATALEN characters and to include non-ASCII characters. Instead,
* remote server truncates application_name of remote connection to less
* than NAMEDATALEN and replaces any non-ASCII characters in it with a '?'
* character.
*/
DefineCustomStringVariable("postgres_fdw.application_name",
"Sets the application name to be used on the remote server.",
NULL,
&pgfdw_application_name,
NULL,
PGC_USERSET,
0,
NULL,
NULL,
NULL);
}