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injection_points: Add routine able to drop all stats

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This serves as an example of how to use the new function introduced in
ce5c620fb625, pgstat_drop_matching_entries(), with a callback able to
filter the entries dropped.

A SQL function named injection_points_stats_drop() is added with some
tests.

Author: Lukas Fitti
Discussion: https://postgr.es/m/CAP53PkwuFbo3NkwZgxwNRMjMfqPEqidD-SggaoQ4ijotBVLJAA@mail.gmail.com
This commit is contained in:
Michael Paquier 2025-01-31 12:41:39 +09:00
parent ce5c620fb6
commit a632cd354d
3 changed files with 42 additions and 0 deletions
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10
src/test/modules/injection_points/injection_points--1.0.sql
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@ -85,6 +85,16 @@ RETURNS bigint
AS 'MODULE_PATHNAME', 'injection_points_stats_numcalls'
LANGUAGE C STRICT;
--
-- injection_points_stats_drop()
--
-- Drop all statistics of injection points.
--
CREATE FUNCTION injection_points_stats_drop()
RETURNS void
AS 'MODULE_PATHNAME', 'injection_points_stats_drop'
LANGUAGE C STRICT;
--
-- injection_points_stats_fixed()
--

19
src/test/modules/injection_points/injection_stats.c
View File

@ -197,3 +197,22 @@ injection_points_stats_numcalls(PG_FUNCTION_ARGS)
PG_RETURN_INT64(entry->numcalls);
}
/* Only used by injection_points_stats_drop() */
static bool
match_inj_entries(PgStatShared_HashEntry *entry, Datum match_data)
{
return entry->key.kind == PGSTAT_KIND_INJECTION;
}
/*
* SQL function that drops all injection point statistics.
*/
PG_FUNCTION_INFO_V1(injection_points_stats_drop);
Datum
injection_points_stats_drop(PG_FUNCTION_ARGS)
{
pgstat_drop_matching_entries(match_inj_entries, 0);
PG_RETURN_VOID();
}

13
src/test/modules/injection_points/t/001_stats.pl
View File

@ -69,6 +69,19 @@ $fixedstats = $node->safe_psql('postgres',
"SELECT * FROM injection_points_stats_fixed();");
is($fixedstats, '0|0|0|0|0', 'fixed stats after crash');
# On drop all stats are gone
$node->safe_psql('postgres',
"SELECT injection_points_attach('stats-notice', 'notice');");
$node->safe_psql('postgres', "SELECT injection_points_run('stats-notice');");
$node->safe_psql('postgres', "SELECT injection_points_run('stats-notice');");
$numcalls = $node->safe_psql('postgres',
"SELECT injection_points_stats_numcalls('stats-notice');");
is($numcalls, '2', 'number of stats calls');
$node->safe_psql('postgres', "SELECT injection_points_stats_drop();");
$numcalls = $node->safe_psql('postgres',
"SELECT injection_points_stats_numcalls('stats-notice');");
is($numcalls, '', 'no stats after drop via SQL function');
# Stop the server, disable the module, then restart. The server
# should be able to come up.
$node->stop;