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New SQL functons pg_backup_in_progress() and pg_backup_start_time()

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Darold Gilles, reviewed by Gabriele Bartolini and others, rebased by
Marco Nenciarini.  Stylistic cleanup and OID fixes by me.
This commit is contained in:
Robert Haas
2012-06-14 13:25:43 -04:00
parent cd80073445
commit 68de499bda
5 changed files with 99 additions and 2 deletions
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73
src/backend/access/transam/xlogfuncs.c
View File

@ -29,7 +29,7 @@
#include "utils/numeric.h"
#include "utils/guc.h"
#include "utils/timestamp.h"
#include "storage/fd.h"
static void validate_xlog_location(char *str);
@ -563,3 +563,74 @@ pg_xlog_location_diff(PG_FUNCTION_ARGS)
PG_RETURN_NUMERIC(result);
}
/*
* Returns bool with current on-line backup mode, a global state.
*/
Datum
pg_is_in_backup(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(BackupInProgress());
}
/*
* Returns start time of an online exclusive backup.
*
* When there's no exclusive backup in progress, the function
* returns NULL.
*/
Datum
pg_backup_start_time(PG_FUNCTION_ARGS)
{
Datum xtime;
FILE *lfp;
char fline[MAXPGPATH];
char backup_start_time[30];
/*
* See if label file is present
*/
lfp = AllocateFile(BACKUP_LABEL_FILE, "r");
if (lfp == NULL)
{
if (errno != ENOENT)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not read file \"%s\": %m",
BACKUP_LABEL_FILE)));
PG_RETURN_NULL();
}
/*
* Parse the file to find the the START TIME line.
*/
backup_start_time[0] = '\0';
while (fgets(fline, sizeof(fline), lfp) != NULL)
{
if (sscanf(fline, "START TIME: %25[^\n]\n", backup_start_time) == 1)
break;
}
/*
* Close the backup label file.
*/
if (ferror(lfp) || FreeFile(lfp))
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not read file \"%s\": %m", BACKUP_LABEL_FILE)));
if (strlen(backup_start_time) == 0)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("invalid data in file \"%s\"", BACKUP_LABEL_FILE)));
/*
* Convert the time string read from file to TimestampTz form.
*/
xtime = DirectFunctionCall3(timestamptz_in,
CStringGetDatum(backup_start_time),
ObjectIdGetDatum(InvalidOid),
Int32GetDatum(-1));
PG_RETURN_DATUM(xtime);
}