origin.h

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/*-------------------------------------------------------------------------
 * origin.h
 *     Exports from replication/logical/origin.c
 *
 * Copyright (c) 2013-2025, PostgreSQL Global Development Group
 *
 * src/include/replication/origin.h
 *-------------------------------------------------------------------------
 */
#ifndef PG_ORIGIN_H
#define PG_ORIGIN_H
 
#include "access/xlog.h"
#include "access/xlogdefs.h"
#include "access/xlogreader.h"
#include "catalog/pg_replication_origin.h"
 
typedef struct xl_replorigin_set
{
    XLogRecPtr  remote_lsn;
    RepOriginId node_id;
    bool        force;
} xl_replorigin_set;
 
typedef struct xl_replorigin_drop
{
    RepOriginId node_id;
} xl_replorigin_drop;
 
#define XLOG_REPLORIGIN_SET     0x00
#define XLOG_REPLORIGIN_DROP        0x10
 
#define InvalidRepOriginId 0
#define DoNotReplicateId PG_UINT16_MAX
 
/*
 * To avoid needing a TOAST table for pg_replication_origin, we limit
 * replication origin names to 512 bytes.  This should be more than enough for
 * all practical use.
 */
#define MAX_RONAME_LEN  512
 
extern PGDLLIMPORT RepOriginId replorigin_session_origin;
extern PGDLLIMPORT XLogRecPtr replorigin_session_origin_lsn;
extern PGDLLIMPORT TimestampTz replorigin_session_origin_timestamp;
 
/* GUCs */
extern PGDLLIMPORT int max_active_replication_origins;
 
/* API for querying & manipulating replication origins */
extern RepOriginId replorigin_by_name(const char *roname, bool missing_ok);
extern RepOriginId replorigin_create(const char *roname);
extern void replorigin_drop_by_name(const char *name, bool missing_ok, bool nowait);
extern bool replorigin_by_oid(RepOriginId roident, bool missing_ok,
                              char **roname);
 
/* API for querying & manipulating replication progress tracking */
extern void replorigin_advance(RepOriginId node,
                               XLogRecPtr remote_commit,
                               XLogRecPtr local_commit,
                               bool go_backward, bool wal_log);
extern XLogRecPtr replorigin_get_progress(RepOriginId node, bool flush);
 
extern void replorigin_session_advance(XLogRecPtr remote_commit,
                                       XLogRecPtr local_commit);
extern void replorigin_session_setup(RepOriginId node, int acquired_by);
extern void replorigin_session_reset(void);
extern XLogRecPtr replorigin_session_get_progress(bool flush);
 
/* Checkpoint/Startup integration */
extern void CheckPointReplicationOrigin(void);
extern void StartupReplicationOrigin(void);
 
/* WAL logging */
extern void replorigin_redo(XLogReaderState *record);
extern void replorigin_desc(StringInfo buf, XLogReaderState *record);
extern const char *replorigin_identify(uint8 info);
 
/* shared memory allocation */
extern Size ReplicationOriginShmemSize(void);
extern void ReplicationOriginShmemInit(void);
 
#endif                          /* PG_ORIGIN_H */