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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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10
dbutils.h
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@@ -73,6 +73,7 @@ typedef struct s_node_info
}
/* structs to store a list of node records */
typedef struct NodeInfoListCell
{
struct NodeInfoListCell *next;
@@ -83,8 +84,14 @@ typedef struct NodeInfoList
{
NodeInfoListCell *head;
NodeInfoListCell *tail;
int node_count;
} NodeInfoList;
#define T_NODE_INFO_LIST_INITIALIZER { \
NULL, \
NULL, \
0 \
}
typedef struct s_event_info
{
@@ -126,6 +133,8 @@ typedef struct s_connection_user
bool is_superuser;
} t_connection_user;
/* connection functions */
PGconn *establish_db_connection(const char *conninfo,
const bool exit_on_error);
@@ -190,6 +199,7 @@ int get_node_record(PGconn *conn, int node_id, t_node_info *node_info);
int get_node_record_by_name(PGconn *conn, const char *node_name, t_node_info *node_info);
bool get_local_node_record(PGconn *conn, int node_id, t_node_info *node_info);
bool get_master_node_record(PGconn *conn, t_node_info *node_info);
void get_downstream_node_records(PGconn *conn, int node_id, NodeInfoList *nodes);
bool create_node_record(PGconn *conn, char *repmgr_action, t_node_info *node_info);
bool update_node_record(PGconn *conn, char *repmgr_action, t_node_info *node_info);