placeholder code for function

dbutils.h

@@ -59,6 +59,7 @@ typedef struct s_node_info
 	char		  slot_name[MAXLEN];
 	int			  priority;
 	bool		  active;
+	/* used during failover to track node status */
 	bool		  is_ready;
 	bool		  is_visible;
 	XLogRecPtr	  xlog_location;

repmgr--4.0.sql

@@ -34,3 +34,6 @@ CREATE VIEW show_nodes AS
 LEFT JOIN nodes un
        ON un.node_id = n.upstream_node_id;
 
+CREATE FUNCTION request_vote(int) RETURNS boolean
+AS '$libdir/repmgr', 'request_vote'
+LANGUAGE C STRICT;

repmgr.c

@@ -28,6 +28,9 @@ PG_MODULE_MAGIC;
 void		_PG_init(void);
 void		_PG_fini(void);
 
+Datum		request_vote(PG_FUNCTION_ARGS);
+PG_FUNCTION_INFO_V1(request_vote);
+
 /*
  * Module load callback
  */
@@ -44,3 +47,14 @@ _PG_fini(void)
 {
 	elog(INFO, "repmgr fini");
 }
+
+
+Datum
+request_vote(PG_FUNCTION_ARGS)
+{
+	uint32 node_id = PG_GETARG_INT32(0);
+
+	elog(INFO, "id is %i", node_id);
+
+	PG_RETURN_BOOL(true);
+}