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Add per-user and per-database connection limit options.

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This patch also includes preliminary update of pg_dumpall for roles.
Petr Jelinek, with review by Bruce Momjian and Tom Lane.
This commit is contained in:
Tom Lane
2005-07-31 17:19:22 +00:00
parent b125877107
commit d42cf5a42a
30 changed files with 783 additions and 180 deletions
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49
src/backend/utils/init/postinit.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.154 2005/07/29 19:30:05 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.155 2005/07/31 17:19:19 tgl Exp $
*
*
*-------------------------------------------------------------------------
@ -169,18 +169,43 @@ ReverifyMyDatabase(const char *name)
name, MyDatabaseId)));
}
/*
* Also check that the database is currently allowing connections.
* (We do not enforce this in standalone mode, however, so that there is
* a way to recover from "UPDATE pg_database SET datallowconn = false;".
* We do not enforce it for the autovacuum process either.)
*/
dbform = (Form_pg_database) GETSTRUCT(tup);
if (IsUnderPostmaster && !IsAutoVacuumProcess() && !dbform->datallowconn)
ereport(FATAL,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("database \"%s\" is not currently accepting connections",
name)));
/*
* These next checks are not enforced when in standalone mode, so that
* there is a way to recover from disabling all access to all databases,
* for example "UPDATE pg_database SET datallowconn = false;".
*
* We do not enforce them for the autovacuum process either.
*/
if (IsUnderPostmaster && !IsAutoVacuumProcess())
{
/*
* Check that the database is currently allowing connections.
*/
if (!dbform->datallowconn)
ereport(FATAL,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("database \"%s\" is not currently accepting connections",
name)));
/*
* Check connection limit for this database.
*
* There is a race condition here --- we create our PGPROC before
* checking for other PGPROCs. If two backends did this at about the
* same time, they might both think they were over the limit, while
* ideally one should succeed and one fail. Getting that to work
* exactly seems more trouble than it is worth, however; instead
* we just document that the connection limit is approximate.
*/
if (dbform->datconnlimit >= 0 &&
!superuser() &&
CountDBBackends(MyDatabaseId) > dbform->datconnlimit)
ereport(FATAL,
(errcode(ERRCODE_TOO_MANY_CONNECTIONS),
errmsg("too many connections for database \"%s\"",
name)));
}
/*
* OK, we're golden. Next to-do item is to save the encoding