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Refactor code of pg_stat_get_wal() building result tuple

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This commit adds to pgstatfuncs.c a new routine called
pg_stat_wal_build_tuple(), helper routine for pg_stat_get_wal().  This
is in charge of filling one tuple based on the contents of
PgStat_WalStats retrieved from pgstats.

This refactoring will be used by an upcoming patch introducing
backend-level WAL statistics, simplifying the main patch.  Note that
it is not possible for stats_reset to be NULL in pg_stat_wal; backend
statistics need to be able to handle this case.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://postgr.es/m/Z3zqc4o09dM/Ezyz@ip-10-97-1-34.eu-west-3.compute.internal
This commit is contained in:
Michael Paquier 2025-02-27 11:54:36 +09:00
parent 62ec3e1f67
commit 495864a4cf
1 changed files with 30 additions and 14 deletions
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44
src/backend/utils/adt/pgstatfuncs.c
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@ -1632,21 +1632,23 @@ pg_stat_get_backend_io(PG_FUNCTION_ARGS)
}
/*
* Returns statistics of WAL activity
* pg_stat_wal_build_tuple
*
* Helper routine for pg_stat_get_wal() returning one tuple based on the
* contents of wal_counters.
*/
Datum
pg_stat_get_wal(PG_FUNCTION_ARGS)
static Datum
pg_stat_wal_build_tuple(PgStat_WalCounters wal_counters,
TimestampTz stat_reset_timestamp)
{
#define PG_STAT_GET_WAL_COLS 5
#define PG_STAT_WAL_COLS 5
TupleDesc tupdesc;
Datum values[PG_STAT_GET_WAL_COLS] = {0};
bool nulls[PG_STAT_GET_WAL_COLS] = {0};
Datum values[PG_STAT_WAL_COLS] = {0};
bool nulls[PG_STAT_WAL_COLS] = {0};
char buf[256];
PgStat_WalStats *wal_stats;
PgStat_WalCounters wal_counters;
/* Initialise attributes information in the tuple descriptor */
tupdesc = CreateTemplateTupleDesc(PG_STAT_GET_WAL_COLS);
tupdesc = CreateTemplateTupleDesc(PG_STAT_WAL_COLS);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "wal_records",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "wal_fpi",
@ -1660,10 +1662,6 @@ pg_stat_get_wal(PG_FUNCTION_ARGS)
BlessTupleDesc(tupdesc);
/* Get statistics about WAL activity */
wal_stats = pgstat_fetch_stat_wal();
wal_counters = wal_stats->wal_counters;
/* Fill values and NULLs */
values[0] = Int64GetDatum(wal_counters.wal_records);
values[1] = Int64GetDatum(wal_counters.wal_fpi);
@ -1677,12 +1675,30 @@ pg_stat_get_wal(PG_FUNCTION_ARGS)
values[3] = Int64GetDatum(wal_counters.wal_buffers_full);
values[4] = TimestampTzGetDatum(wal_stats->stat_reset_timestamp);
if (stat_reset_timestamp != 0)
values[4] = TimestampTzGetDatum(stat_reset_timestamp);
else
nulls[4] = true;
/* Returns the record as Datum */
PG_RETURN_DATUM(HeapTupleGetDatum(heap_form_tuple(tupdesc, values, nulls)));
}
/*
* Returns statistics of WAL activity
*/
Datum
pg_stat_get_wal(PG_FUNCTION_ARGS)
{
PgStat_WalStats *wal_stats;
/* Get statistics about WAL activity */
wal_stats = pgstat_fetch_stat_wal();
return (pg_stat_wal_build_tuple(wal_stats->wal_counters,
wal_stats->stat_reset_timestamp));
}
/*
* Returns statistics of SLRU caches.
*/