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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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5
dbutils.h
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@@ -133,6 +133,8 @@ typedef enum
typedef enum
{
SLOT_UNKNOWN = -1,
SLOT_NOT_FOUND,
SLOT_NOT_PHYSICAL,
SLOT_INACTIVE,
SLOT_ACTIVE
} ReplSlotStatus;
@@ -436,6 +438,7 @@ PGconn *establish_primary_db_connection(PGconn *conn,
const bool exit_on_error);
PGconn *get_primary_connection(PGconn *standby_conn, int *primary_id, char *primary_conninfo_out);
PGconn *get_primary_connection_quiet(PGconn *standby_conn, int *primary_id, char *primary_conninfo_out);
PGconn *duplicate_connection(PGconn *conn, const char *user, bool replication);
bool is_superuser_connection(PGconn *conn, t_connection_user *userinfo);\
bool is_replication_role(PGconn *conn, char *rolname);
@@ -564,7 +567,7 @@ void create_slot_name(char *slot_name, int node_id);
bool create_replication_slot_sql(PGconn *conn, char *slot_name, PQExpBufferData *error_msg);
bool create_replication_slot_replprot(PGconn *conn, PGconn *repl_conn, char *slot_name, PQExpBufferData *error_msg);
bool drop_replication_slot_sql(PGconn *conn, char *slot_name);
bool drop_replication_slot_replprot(PGconn *conn, PGconn *repl_conn, char *slot_name);
bool drop_replication_slot_replprot(PGconn *repl_conn, char *slot_name);
RecordStatus get_slot_record(PGconn *conn, char *slot_name, t_replication_slot *record);
int get_free_replication_slot_count(PGconn *conn);