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"standby follow": check for replication slot availability on target node

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Ian Barwick
2018-02-02 15:01:23 +09:00
parent 65bf203a89
commit 6c81e54f76
3 changed files with 69 additions and 1 deletions
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39
dbutils.c
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@@ -3550,6 +3550,45 @@ get_slot_record(PGconn *conn, char *slot_name, t_replication_slot *record)
return RECORD_FOUND;
}
int
get_free_replication_slots(PGconn *conn)
{
PQExpBufferData query;
PGresult *res = NULL;
int free_slots = 0;
initPQExpBuffer(&query);
appendPQExpBuffer(&query,
" SELECT pg_catalog.current_setting('max_replication_slots')::INT - "
" COUNT(*) AS free_slots"
" FROM pg_catalog.pg_replication_slots");
res = PQexec(conn, query.data);
termPQExpBuffer(&query);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_error(_("unable to execute replication slot query"));
log_detail("%s", PQerrorMessage(conn));
PQclear(res);
return -1;
}
if (PQntuples(res) == 0)
{
PQclear(res);
return -1;
}
free_slots = atoi(PQgetvalue(res, 0, 0));
PQclear(res);
return free_slots;
}
/* ==================== */
/* tablespace functions */
/* ==================== */