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/*--------------------------------------------------------------------------
*
* injection_stats.c
* Code for statistics of injection points.
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/test/modules/injection_points/injection_stats.c
*
* -------------------------------------------------------------------------
*/
#include "postgres.h"
#include "fmgr.h"
#include "common/hashfn.h"
#include "injection_stats.h"
#include "pgstat.h"
#include "utils/builtins.h"
#include "utils/pgstat_internal.h"
/* Structures for statistics of injection points */
typedef struct PgStat_StatInjEntry
{
PgStat_Counter numcalls; /* number of times point has been run */
} PgStat_StatInjEntry;
typedef struct PgStatShared_InjectionPoint
{
PgStatShared_Common header;
PgStat_StatInjEntry stats;
} PgStatShared_InjectionPoint;
static bool injection_stats_flush_cb(PgStat_EntryRef *entry_ref, bool nowait);
static const PgStat_KindInfo injection_stats = {
.name = "injection_points",
.fixed_amount = false, /* Bounded by the number of points */
.write_to_file = true,
/* Injection points are system-wide */
.accessed_across_databases = true,
.shared_size = sizeof(PgStatShared_InjectionPoint),
.shared_data_off = offsetof(PgStatShared_InjectionPoint, stats),
.shared_data_len = sizeof(((PgStatShared_InjectionPoint *) 0)->stats),
.pending_size = sizeof(PgStat_StatInjEntry),
.flush_pending_cb = injection_stats_flush_cb,
};
/*
* Compute stats entry idx from point name with an 8-byte hash.
*/
#define PGSTAT_INJ_IDX(name) hash_bytes_extended((const unsigned char *) name, strlen(name), 0)
/*
* Kind ID reserved for statistics of injection points.
*/
#define PGSTAT_KIND_INJECTION 129
/* Track if stats are loaded */
static bool inj_stats_loaded = false;
/*
* Callback for stats handling
*/
static bool
injection_stats_flush_cb(PgStat_EntryRef *entry_ref, bool nowait)
{
PgStat_StatInjEntry *localent;
PgStatShared_InjectionPoint *shfuncent;
localent = (PgStat_StatInjEntry *) entry_ref->pending;
shfuncent = (PgStatShared_InjectionPoint *) entry_ref->shared_stats;
if (!pgstat_lock_entry(entry_ref, nowait))
return false;
shfuncent->stats.numcalls += localent->numcalls;
pgstat_unlock_entry(entry_ref);
return true;
}
/*
* Support function for the SQL-callable pgstat* functions. Returns
* a pointer to the injection point statistics struct.
*/
static PgStat_StatInjEntry *
pgstat_fetch_stat_injentry(const char *name)
{
PgStat_StatInjEntry *entry = NULL;
if (!inj_stats_loaded || !inj_stats_enabled)
return NULL;
/* Compile the lookup key as a hash of the point name */
entry = (PgStat_StatInjEntry *) pgstat_fetch_entry(PGSTAT_KIND_INJECTION,
InvalidOid,
PGSTAT_INJ_IDX(name));
return entry;
}
/*
* Workhorse to do the registration work, called in _PG_init().
*/
void
pgstat_register_inj(void)
{
pgstat_register_kind(PGSTAT_KIND_INJECTION, &injection_stats);
/* mark stats as loaded */
inj_stats_loaded = true;
}
/*
* Report injection point creation.
*/
void
pgstat_create_inj(const char *name)
{
PgStat_EntryRef *entry_ref;
PgStatShared_InjectionPoint *shstatent;
/* leave if disabled */
if (!inj_stats_loaded || !inj_stats_enabled)
return;
entry_ref = pgstat_prep_pending_entry(PGSTAT_KIND_INJECTION, InvalidOid,
PGSTAT_INJ_IDX(name), NULL);
shstatent = (PgStatShared_InjectionPoint *) entry_ref->shared_stats;
/* initialize shared memory data */
memset(&shstatent->stats, 0, sizeof(shstatent->stats));
}
/*
* Report injection point drop.
*/
void
pgstat_drop_inj(const char *name)
{
/* leave if disabled */
if (!inj_stats_loaded || !inj_stats_enabled)
return;
if (!pgstat_drop_entry(PGSTAT_KIND_INJECTION, InvalidOid,
PGSTAT_INJ_IDX(name)))
pgstat_request_entry_refs_gc();
}
/*
* Report statistics for injection point.
*
* This is simple because the set of stats to report currently is simple:
* track the number of times a point has been run.
*/
void
pgstat_report_inj(const char *name)
{
PgStat_EntryRef *entry_ref;
PgStatShared_InjectionPoint *shstatent;
PgStat_StatInjEntry *statent;
/* leave if disabled */
if (!inj_stats_loaded || !inj_stats_enabled)
return;
entry_ref = pgstat_prep_pending_entry(PGSTAT_KIND_INJECTION, InvalidOid,
PGSTAT_INJ_IDX(name), NULL);
shstatent = (PgStatShared_InjectionPoint *) entry_ref->shared_stats;
statent = &shstatent->stats;
/* Update the injection point statistics */
statent->numcalls++;
}
/*
* SQL function returning the number of times an injection point
* has been called.
*/
PG_FUNCTION_INFO_V1(injection_points_stats_numcalls);
Datum
injection_points_stats_numcalls(PG_FUNCTION_ARGS)
{
char *name = text_to_cstring(PG_GETARG_TEXT_PP(0));
PgStat_StatInjEntry *entry = pgstat_fetch_stat_injentry(name);
if (entry == NULL)
PG_RETURN_NULL();
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();
}
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