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repmgr master unregister: check for downstream nodes

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Foreign key dependencies will make it impossible to remove the node
if it still has downstream nodes pointing to it.
This commit is contained in:
Ian Barwick
2017-06-12 22:24:50 +09:00
parent fbb534e394
commit bb7d3e41c3
3 changed files with 110 additions and 4 deletions
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56
dbutils.c
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@@ -20,10 +20,10 @@ static PGconn *_establish_db_connection(const char *conninfo,
const bool verbose_only);
static bool _set_config(PGconn *conn, const char *config_param, const char *sqlquery);
static int _get_node_record(PGconn *conn, char *sqlquery, t_node_info *node_info);
static int _get_node_record(PGconn *conn, char *sqlquery, t_node_info *node_info);
static void _populate_node_record(PGresult *res, t_node_info *node_info, int row);
static bool _create_update_node_record(PGconn *conn, char *action, t_node_info *node_info);
static bool _create_event_record(PGconn *conn, t_configuration_options *options, int node_id, char *event, bool successful, char *details, t_event_info *event_info);
static bool _create_event_record(PGconn *conn, t_configuration_options *options, int node_id, char *event, bool successful, char *details, t_event_info *event_info);
/* ==================== */
@@ -1303,6 +1303,58 @@ get_local_node_record(PGconn *conn, int node_id, t_node_info *node_info)
}
void
get_downstream_node_records(PGconn *conn, int node_id, NodeInfoList *node_list)
{
PQExpBufferData query;
PGresult *result;
int i;
initPQExpBuffer(&query);
appendPQExpBuffer(&query,
" SELECT node_id, type, upstream_node_id, node_name, conninfo, slot_name, priority, active"
" FROM repmgr.nodes "
" WHERE upstream_node_id = %i "
"ORDER BY node_id ",
node_id);
log_verbose(LOG_DEBUG, "get_node_records_by_priority():\n%s", query.data);
result = PQexec(conn, query.data);
termPQExpBuffer(&query);
node_list->head = NULL;
node_list->tail = NULL;
node_list->node_count = 0;
if (PQresultStatus(result) != PGRES_TUPLES_OK)
{
return;
}
for (i = 0; i < PQntuples(result); i++)
{
NodeInfoListCell *cell;
cell = (NodeInfoListCell *) pg_malloc0(sizeof(NodeInfoListCell));
cell->node_info = pg_malloc0(sizeof(t_node_info));
_populate_node_record(result, cell->node_info, i);
if (node_list->tail)
node_list->tail->next = cell;
else
node_list->head = cell;
node_list->tail = cell;
node_list->node_count++;
}
return;
}
bool
create_node_record(PGconn *conn, char *repmgr_action, t_node_info *node_info)
{