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Minimize user permissions requirements for replication slots

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Enable operations which create or drop replication slots to be carried
out with the minimum necessary user permissions, i.e. a user with the
REPLICATION attribute.

This can be the repmgr user, or a dedicated replication user.
In the latter case, if the dedicated replication user is only
permitted to make replication connections, the streaming
replication protocol is used to create/drop slots.

Implements part of GitHub #536.
This commit is contained in:
Ian Barwick
2019-10-23 10:56:14 +09:00
parent 1a9bcddccd
commit 220ec7fc96
6 changed files with 451 additions and 123 deletions
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14
repmgr-client-global.h
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@@ -201,6 +201,16 @@ typedef enum
} t_server_action;
typedef enum
{
USER_TYPE_UNKNOWN = -1,
REPMGR_USER,
REPLICATION_USER_OPT,
REPLICATION_USER_NODE,
SUPERUSER
} t_user_type;
typedef struct ColHeader
{
char title[MAXLEN];
@@ -255,7 +265,9 @@ extern void get_node_config_directory(char *config_dir_buf);
extern void get_node_data_directory(char *data_dir_buf);
extern void init_node_record(t_node_info *node_record);
extern bool can_use_pg_rewind(PGconn *conn, const char *data_directory, PQExpBufferData *reason);
extern void drop_replication_slot_if_exists(PGconn *conn, int node_id, char *slot_name);
extern bool create_replication_slot(PGconn *conn, char *slot_name, t_node_info *upstream_node_record, PQExpBufferData *error_msg);
extern bool drop_replication_slot_if_exists(PGconn *conn, int node_id, char *slot_name);
extern bool check_node_can_attach(TimeLineID local_tli, XLogRecPtr local_xlogpos, PGconn *follow_target_conn, t_node_info *follow_target_node_record, bool is_rejoin);
extern void check_shared_library(PGconn *conn);