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"standby clone": perform clone operations

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This commit is contained in:
Ian Barwick
2017-05-02 09:58:17 +09:00
parent 8f74d1b946
commit a960ed9d49
6 changed files with 1308 additions and 9 deletions
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105
dbutils.c
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@@ -1142,6 +1142,7 @@ get_node_record_by_name(PGconn *conn, const char *node_name, t_node_info *node_i
int result;
initPQExpBuffer(&query);
appendPQExpBuffer(&query,
"SELECT node_id, type, upstream_node_id, node_name, conninfo, slot_name, priority, active"
" FROM repmgr.nodes "
@@ -1152,6 +1153,8 @@ get_node_record_by_name(PGconn *conn, const char *node_name, t_node_info *node_i
result = _get_node_record(conn, query.data, node_info);
termPQExpBuffer(&query);
if (result == 0)
{
log_verbose(LOG_DEBUG, "get_node_record(): no record found for node %s",
@@ -1670,3 +1673,105 @@ get_slot_record(PGconn *conn, char *slot_name, t_replication_slot *record)
return 1;
}
/* ================ */
/* backup functions */
/* ================ */
// XXX is first_wal_segment actually used anywhere?
bool
start_backup(PGconn *conn, char *first_wal_segment, bool fast_checkpoint, int server_version_num)
{
PQExpBufferData query;
PGresult *res;
initPQExpBuffer(&query);
if (server_version_num >= 100000)
{
appendPQExpBuffer(&query,
"SELECT pg_catalog.pg_walfile_name(pg_catalog.pg_start_backup('repmgr_standby_clone_%ld', %s))",
time(NULL),
fast_checkpoint ? "TRUE" : "FALSE");
}
else
{
appendPQExpBuffer(&query,
"SELECT pg_catalog.pg_xlogfile_name(pg_catalog.pg_start_backup('repmgr_standby_clone_%ld', %s))",
time(NULL),
fast_checkpoint ? "TRUE" : "FALSE");
}
log_verbose(LOG_DEBUG, "start_backup():\n %s", query.data);
res = PQexec(conn, query.data);
termPQExpBuffer(&query);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_error(_("unable to start backup:\n %s"), PQerrorMessage(conn));
PQclear(res);
return false;
}
if (first_wal_segment != NULL)
{
char *first_wal_seg_pq = PQgetvalue(res, 0, 0);
size_t buf_sz = strlen(first_wal_seg_pq);
first_wal_segment = pg_malloc0(buf_sz + 1);
snprintf(first_wal_segment, buf_sz + 1, "%s", first_wal_seg_pq);
}
PQclear(res);
return true;
}
bool
stop_backup(PGconn *conn, char *last_wal_segment, int server_version_num)
{
PQExpBufferData query;
PGresult *res;
initPQExpBuffer(&query);
if (server_version_num >= 100000)
{
appendPQExpBuffer(&query,
"SELECT pg_catalog.pg_walfile_name(pg_catalog.pg_stop_backup())");
}
else
{
appendPQExpBuffer(&query,
"SELECT pg_catalog.pg_xlogfile_name(pg_catalog.pg_stop_backup())");
}
res = PQexec(conn, query.data);
termPQExpBuffer(&query);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_error(_("unable to stop backup:\n %s"), PQerrorMessage(conn));
PQclear(res);
return false;
}
if (last_wal_segment != NULL)
{
char *last_wal_seg_pq = PQgetvalue(res, 0, 0);
size_t buf_sz = strlen(last_wal_seg_pq);
last_wal_segment = pg_malloc0(buf_sz + 1);
snprintf(last_wal_segment, buf_sz + 1, "%s", last_wal_seg_pq);
}
PQclear(res);
return true;
}