pgstat_archiver.c

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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) 2001-2025, 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_init_shmem_cb(void *stats)
{
    PgStatShared_Archiver *stats_shmem = (PgStatShared_Archiver *) stats;
 
    LWLockInitialize(&stats_shmem->lock, LWTRANCHE_PGSTATS_DATA);
}
 
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;
}