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Add a hook to let loadable modules get control at ProcessUtility execution,

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and use it to extend contrib/pg_stat_statements to track utility commands.

Itagaki Takahiro, reviewed by Euler Taveira de Oliveira.
This commit is contained in:
Tom Lane
2009-12-15 20:04:49 +00:00
parent 34d26872ed
commit a5495cd841
4 changed files with 135 additions and 11 deletions
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27
src/backend/tcop/utility.c
View File

@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/utility.c,v 1.323 2009/12/11 03:34:55 itagaki Exp $
* $PostgreSQL: pgsql/src/backend/tcop/utility.c,v 1.324 2009/12/15 20:04:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -58,6 +58,10 @@
#include "utils/syscache.h"
/* Hook for plugins to get control in ProcessUtility() */
ProcessUtility_hook_type ProcessUtility_hook = NULL;
/*
* Verify user has ownership of specified relation, else ereport.
*
@ -274,6 +278,27 @@ ProcessUtility(Node *parsetree,
{
Assert(queryString != NULL); /* required as of 8.4 */
/*
* We provide a function hook variable that lets loadable plugins
* get control when ProcessUtility is called. Such a plugin would
* normally call standard_ProcessUtility().
*/
if (ProcessUtility_hook)
(*ProcessUtility_hook) (parsetree, queryString, params,
isTopLevel, dest, completionTag);
else
standard_ProcessUtility(parsetree, queryString, params,
isTopLevel, dest, completionTag);
}
void
standard_ProcessUtility(Node *parsetree,
const char *queryString,
ParamListInfo params,
bool isTopLevel,
DestReceiver *dest,
char *completionTag)
{
check_xact_readonly(parsetree);
if (completionTag)

11
src/include/tcop/utility.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/tcop/utility.h,v 1.37 2009/12/01 02:31:13 momjian Exp $
* $PostgreSQL: pgsql/src/include/tcop/utility.h,v 1.38 2009/12/15 20:04:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -17,9 +17,18 @@
#include "tcop/tcopprot.h"
/* Hook for plugins to get control in ProcessUtility() */
typedef void (*ProcessUtility_hook_type) (Node *parsetree,
const char *queryString, ParamListInfo params, bool isTopLevel,
DestReceiver *dest, char *completionTag);
extern PGDLLIMPORT ProcessUtility_hook_type ProcessUtility_hook;
extern void ProcessUtility(Node *parsetree, const char *queryString,
ParamListInfo params, bool isTopLevel,
DestReceiver *dest, char *completionTag);
extern void standard_ProcessUtility(Node *parsetree, const char *queryString,
ParamListInfo params, bool isTopLevel,
DestReceiver *dest, char *completionTag);
extern bool UtilityReturnsTuples(Node *parsetree);