Store upstream node ID if set

Required to manage cascaded standbys

config.c

@@ -85,6 +85,8 @@ parse_config(const char *config_file, t_configuration_options * options)
 			strncpy(options->cluster_name, value, MAXLEN);
 		else if (strcmp(name, "node") == 0)
 			options->node = atoi(value);
+		else if (strcmp(name, "upstream_node") == 0)
+			options->upstream_node = atoi(value);
 		else if (strcmp(name, "conninfo") == 0)
 			strncpy(options->conninfo, value, MAXLEN);
 		else if (strcmp(name, "rsync_options") == 0)

config.h

@@ -23,10 +23,13 @@
 #include "repmgr.h"
 #include "strutil.h"
 
+
+
 typedef struct
 {
 	char		cluster_name[MAXLEN];
 	int			node;
+	int         upstream_node;
 	char		conninfo[MAXLEN];
 	int			failover;
 	int			priority;
@@ -47,7 +50,8 @@ typedef struct
 	int			retry_promote_interval_secs;
 }	t_configuration_options;
 
-#define T_CONFIGURATION_OPTIONS_INITIALIZER { "", -1, "", MANUAL_FAILOVER, -1, "", "", "", "", "", "", "", -1, -1, -1, "", "", "", 0, 0 }
+#define T_CONFIGURATION_OPTIONS_INITIALIZER { "", -1, NO_UPSTREAM_NODE, "", MANUAL_FAILOVER, -1, "", "", "", "", "", "", "", -1, -1, -1, "", "", "", 0, 0 }
+
 
 void		parse_config(const char *config_file, t_configuration_options * options);
 void		parse_line(char *buff, char *name, char *value);

repmgr.c

@@ -65,7 +65,7 @@ static bool write_recovery_file_line(FILE *recovery_file, char *recovery_file_pa
 static int	check_server_version(PGconn *conn, char *server_type, bool exit_on_error, char *server_version_string);
 static bool check_upstream_config(PGconn *conn, bool exit_on_error);
 
-static bool create_node_record(PGconn *conn, char *action, int node, char *cluster_name, char *node_name, char *conninfo, int priority, bool witness);
+static bool create_node_record(PGconn *conn, char *action, int node, int upstream_node, char *cluster_name, char *node_name, char *conninfo, int priority, bool witness);
 
 static void do_master_register(void);
 static void do_standby_register(void);
@@ -632,6 +632,7 @@ do_master_register(void)
 	node_record_created = create_node_record(conn,
 											 "master register",
 											 options.node,
+											 NO_UPSTREAM_NODE,
 											 options.cluster_name,
 											 options.node_name,
 											 options.conninfo,
@@ -753,6 +754,7 @@ do_standby_register(void)
 	node_record_created = create_node_record(master_conn,
 											 "standby register",
 											 options.node,
+											 options.upstream_node,
 											 options.cluster_name,
 											 options.node_name,
 											 options.conninfo,
@@ -1555,6 +1557,7 @@ do_witness_create(void)
 	node_record_created = create_node_record(masterconn,
 											 "witness create",
 											 options.node,
+											 NO_UPSTREAM_NODE,
 											 options.cluster_name,
 											 options.node_name,
 											 options.conninfo,
@@ -2229,6 +2232,7 @@ copy_configuration(PGconn *masterconn, PGconn *witnessconn)
 		node_record_created = create_node_record(witnessconn,
 												 "copy_configuration",
 												 atoi(PQgetvalue(res, i, 0)),
+												 NO_UPSTREAM_NODE,
 												 options.cluster_name,
 												 PQgetvalue(res, i, 1),
 												 PQgetvalue(res, i, 2),
@@ -2480,17 +2484,29 @@ do_check_upstream_config(void)
 
 
 static bool
-create_node_record(PGconn *conn, char *action, int node, char *cluster_name, char *node_name, char *conninfo, int priority, bool witness)
+create_node_record(PGconn *conn, char *action, int node, int upstream_node, char *cluster_name, char *node_name, char *conninfo, int priority, bool witness)
 {
 	char		sqlquery[QUERY_STR_LEN];
+	char		upstream_node_id[QUERY_STR_LEN];
 	PGresult   *res;
 
+	if(upstream_node != NO_UPSTREAM_NODE)
+	{
+		sqlquery_snprintf(upstream_node_id, "%i", upstream_node);
+	}
+	else
+	{
+		sqlquery_snprintf(upstream_node_id, "%s", "NULL");
+	}
+
 	sqlquery_snprintf(sqlquery,
 					  "INSERT INTO %s.repl_nodes "
-					  "       (id, cluster, name, conninfo, priority, witness) "
+					  "       (id, upstream_node_id, cluster, "
-					  "VALUES (%d, '%s', '%s', '%s', %d, %s) ",
+					  "        name, conninfo, priority, witness) "
+					  "VALUES (%d, %s, '%s', '%s', '%s', %d, %s) ",
 					  get_repmgr_schema_quoted(conn),
 					  node,
+					  upstream_node_id,
 					  cluster_name,
 					  node_name,
 					  conninfo,

repmgr.h

@@ -38,7 +38,7 @@
 
 #include "config.h"
 #define MAXFILENAME		1024
-#define ERRBUFF_SIZE		512
+#define ERRBUFF_SIZE	512
 
 #define DEFAULT_CONFIG_FILE		"./repmgr.conf"
 #define DEFAULT_WAL_KEEP_SEGMENTS	"5000"
@@ -51,7 +51,7 @@
 
 #define MANUAL_FAILOVER		0
 #define AUTOMATIC_FAILOVER	1
-
+#define NO_UPSTREAM_NODE	-1
 
 /* Run time options type */
 typedef struct