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/* -------------------------------------------------------------------------
*
* pgstat_archiver.c
* Implementation of archiver statistics.
*
* This file contains the implementation of archiver statistics. It is kept
* separate from pgstat.c to enforce the line between the statistics access /
* storage implementation and the details about individual types of
* statistics.
*
* Copyright (c) 2001-2022, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/backend/utils/activity/pgstat_archiver.c
* -------------------------------------------------------------------------
*/
#include "postgres.h"
#include "utils/pgstat_internal.h"
#include "utils/timestamp.h"
/*
* Report archiver statistics
*/
void
pgstat_report_archiver(const char *xlog, bool failed)
{
PgStatShared_Archiver *stats_shmem = &pgStatLocal.shmem->archiver;
TimestampTz now = GetCurrentTimestamp();
pgstat_begin_changecount_write(&stats_shmem->changecount);
if (failed)
{
++stats_shmem->stats.failed_count;
memcpy(&stats_shmem->stats.last_failed_wal, xlog,
sizeof(stats_shmem->stats.last_failed_wal));
stats_shmem->stats.last_failed_timestamp = now;
}
else
{
++stats_shmem->stats.archived_count;
memcpy(&stats_shmem->stats.last_archived_wal, xlog,
sizeof(stats_shmem->stats.last_archived_wal));
stats_shmem->stats.last_archived_timestamp = now;
}
pgstat_end_changecount_write(&stats_shmem->changecount);
}
/*
* Support function for the SQL-callable pgstat* functions. Returns
* a pointer to the archiver statistics struct.
*/
PgStat_ArchiverStats *
pgstat_fetch_stat_archiver(void)
{
pgstat_snapshot_fixed(PGSTAT_KIND_ARCHIVER);
return &pgStatLocal.snapshot.archiver;
}
void
pgstat_archiver_reset_all_cb(TimestampTz ts)
{
PgStatShared_Archiver *stats_shmem = &pgStatLocal.shmem->archiver;
/* see explanation above PgStatShared_Archiver for the reset protocol */
LWLockAcquire(&stats_shmem->lock, LW_EXCLUSIVE);
pgstat_copy_changecounted_stats(&stats_shmem->reset_offset,
&stats_shmem->stats,
sizeof(stats_shmem->stats),
&stats_shmem->changecount);
stats_shmem->stats.stat_reset_timestamp = ts;
LWLockRelease(&stats_shmem->lock);
}
void
pgstat_archiver_snapshot_cb(void)
{
PgStatShared_Archiver *stats_shmem = &pgStatLocal.shmem->archiver;
PgStat_ArchiverStats *stat_snap = &pgStatLocal.snapshot.archiver;
PgStat_ArchiverStats *reset_offset = &stats_shmem->reset_offset;
PgStat_ArchiverStats reset;
pgstat_copy_changecounted_stats(stat_snap,
&stats_shmem->stats,
sizeof(stats_shmem->stats),
&stats_shmem->changecount);
LWLockAcquire(&stats_shmem->lock, LW_SHARED);
memcpy(&reset, reset_offset, sizeof(stats_shmem->stats));
LWLockRelease(&stats_shmem->lock);
/* compensate by reset offsets */
if (stat_snap->archived_count == reset.archived_count)
{
stat_snap->last_archived_wal[0] = 0;
stat_snap->last_archived_timestamp = 0;
}
stat_snap->archived_count -= reset.archived_count;
if (stat_snap->failed_count == reset.failed_count)
{
stat_snap->last_failed_wal[0] = 0;
stat_snap->last_failed_timestamp = 0;
}
stat_snap->failed_count -= reset.failed_count;
}
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