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/*-------------------------------------------------------------------------
*
* logtofile_filename.c
* Functions to calculate the filename of the log file
*
* Copyright (c) 2020-2025, Francisco Miguel Biete Banon
*
* This code is released under the PostgreSQL licence, as given at
* http://www.postgresql.org/about/licence/
*-------------------------------------------------------------------------
*/
#include "logtofile_filename.h"
#include <pgtime.h>
#include <datatype/timestamp.h>
#include <utils/timestamp.h>
#include "logtofile_vars.h"
// Private functions
char *pgauditlogtofile_tm2filename(const struct pg_tm *tm);
/**
* @brief Calculate the current filename of the log file
* @param void
* @return char * - the current filename
*/
char *
PgAuditLogToFile_current_filename(void)
{
pg_time_t timet = timestamptz_to_time_t(GetCurrentTimestamp());
struct pg_tm *tm = pg_localtime(&timet, log_timezone);
return pgauditlogtofile_tm2filename(tm);
}
/**
* @brief Set the next rotation time
* @param void
* @return void
* @note Copied from src/backend/postmaster/syslogger.c
*/
void PgAuditLogToFile_set_next_rotation_time(void)
{
pg_time_t now;
struct pg_tm *tm;
int rotinterval;
/* nothing to do if time-based rotation is disabled */
if (guc_pgaudit_ltf_log_rotation_age < 1)
return;
/*
* The requirements here are to choose the next time > now that is a
* "multiple" of the log rotation interval. "Multiple" can be interpreted
* fairly loosely. In this version we align to log_timezone rather than
* GMT.
*/
rotinterval = guc_pgaudit_ltf_log_rotation_age * SECS_PER_MINUTE; /* convert to seconds */
now = (pg_time_t)time(NULL);
tm = pg_localtime(&now, log_timezone);
now += tm->tm_gmtoff;
now -= now % rotinterval;
now += rotinterval;
now -= tm->tm_gmtoff;
LWLockAcquire(pgaudit_ltf_shm->lock, LW_EXCLUSIVE);
pgaudit_ltf_shm->next_rotation_time = now;
LWLockRelease(pgaudit_ltf_shm->lock);
}
/**
* @brief Convert a pg_tm structure to a filename
* @param tm - the pg_tm structure
* @return char * - the filename
*/
char *
pgauditlogtofile_tm2filename(const struct pg_tm *tm)
{
char *filename = NULL;
int len;
filename = palloc(MAXPGPATH * sizeof(char *));
if (filename != NULL)
{
memset(filename, 0, sizeof(char) * MAXPGPATH);
snprintf(filename, MAXPGPATH, "%s/", guc_pgaudit_ltf_log_directory);
len = strlen(filename);
pg_strftime(filename + len, MAXPGPATH - len, guc_pgaudit_ltf_log_filename, tm);
}
return filename;
}
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