pg_subscription.h

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/* -------------------------------------------------------------------------
 *
 * pg_subscription.h
 *    definition of the "subscription" system catalog (pg_subscription)
 *
 * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/catalog/pg_subscription.h
 *
 * NOTES
 *    The Catalog.pm module reads this file and derives schema
 *    information.
 *
 * -------------------------------------------------------------------------
 */
#ifndef PG_SUBSCRIPTION_H
#define PG_SUBSCRIPTION_H
 
#include "access/xlogdefs.h"
#include "catalog/genbki.h"
#include "catalog/pg_subscription_d.h"  /* IWYU pragma: export */
#include "lib/stringinfo.h"
#include "nodes/pg_list.h"
 
/* ----------------
 *      pg_subscription definition. cpp turns this into
 *      typedef struct FormData_pg_subscription
 * ----------------
 */
 
/*
 * Technically, the subscriptions live inside the database, so a shared catalog
 * seems weird, but the replication launcher process needs to access all of
 * them to be able to start the workers, so we have to put them in a shared,
 * nailed catalog.
 *
 * CAUTION:  There is a GRANT in system_views.sql to grant public select
 * access on all columns except subconninfo.  When you add a new column
 * here, be sure to update that (or, if the new column is not to be publicly
 * readable, update associated comments and catalogs.sgml instead).
 */
BEGIN_CATALOG_STRUCT
 
CATALOG(pg_subscription,6100,SubscriptionRelationId) BKI_SHARED_RELATION BKI_ROWTYPE_OID(6101,SubscriptionRelation_Rowtype_Id) BKI_SCHEMA_MACRO
{
    Oid         oid;            /* oid */
 
    Oid         subdbid BKI_LOOKUP(pg_database);    /* Database the
                                                     * subscription is in. */
 
    XLogRecPtr  subskiplsn;     /* All changes finished at this LSN are
                                 * skipped */
 
    NameData    subname;        /* Name of the subscription */
 
    Oid         subowner BKI_LOOKUP(pg_authid); /* Owner of the subscription */
 
    bool        subenabled;     /* True if the subscription is enabled (the
                                 * worker should be running) */
 
    bool        subbinary;      /* True if the subscription wants the
                                 * publisher to send data in binary */
 
    char        substream;      /* Stream in-progress transactions. See
                                 * LOGICALREP_STREAM_xxx constants. */
 
    char        subtwophasestate;   /* Stream two-phase transactions */
 
    bool        subdisableonerr;    /* True if a worker error should cause the
                                     * subscription to be disabled */
 
    bool        subpasswordrequired;    /* Must connection use a password? */
 
    bool        subrunasowner;  /* True if replication should execute as the
                                 * subscription owner */
 
    bool        subfailover;    /* True if the associated replication slots
                                 * (i.e. the main slot and the table sync
                                 * slots) in the upstream database are enabled
                                 * to be synchronized to the standbys. */
 
    bool        subretaindeadtuples;    /* True if dead tuples useful for
                                         * conflict detection are retained */
 
    int32       submaxretention;    /* The maximum duration (in milliseconds)
                                     * for which information useful for
                                     * conflict detection can be retained */
 
    bool        subretentionactive; /* True if retain_dead_tuples is enabled
                                     * and the retention duration has not
                                     * exceeded max_retention_duration, when
                                     * defined */
 
    Oid         subserver BKI_LOOKUP_OPT(pg_foreign_server);    /* If connection uses
                                                                 * server */
 
#ifdef CATALOG_VARLEN           /* variable-length fields start here */
    /* Connection string to the publisher */
    text        subconninfo;    /* Set if connecting with connection string */
 
    /* Slot name on publisher */
    NameData    subslotname BKI_FORCE_NULL;
 
    /* Synchronous commit setting for worker */
    text        subsynccommit BKI_FORCE_NOT_NULL;
 
    /* wal_receiver_timeout setting for worker */
    text        subwalrcvtimeout BKI_FORCE_NOT_NULL;
 
    /* List of publications subscribed to */
    text        subpublications[1] BKI_FORCE_NOT_NULL;
 
    /* Only publish data originating from the specified origin */
    text        suborigin BKI_DEFAULT(LOGICALREP_ORIGIN_ANY);
#endif
} FormData_pg_subscription;
 
END_CATALOG_STRUCT
 
typedef FormData_pg_subscription *Form_pg_subscription;
 
DECLARE_TOAST_WITH_MACRO(pg_subscription, 4183, 4184, PgSubscriptionToastTable, PgSubscriptionToastIndex);
 
DECLARE_UNIQUE_INDEX_PKEY(pg_subscription_oid_index, 6114, SubscriptionObjectIndexId, pg_subscription, btree(oid oid_ops));
DECLARE_UNIQUE_INDEX(pg_subscription_subname_index, 6115, SubscriptionNameIndexId, pg_subscription, btree(subdbid oid_ops, subname name_ops));
 
MAKE_SYSCACHE(SUBSCRIPTIONOID, pg_subscription_oid_index, 4);
MAKE_SYSCACHE(SUBSCRIPTIONNAME, pg_subscription_subname_index, 4);
 
typedef struct Subscription
{
    MemoryContext cxt;          /* mem cxt containing this subscription */
 
    Oid         oid;            /* Oid of the subscription */
    Oid         dbid;           /* Oid of the database which subscription is
                                 * in */
    XLogRecPtr  skiplsn;        /* All changes finished at this LSN are
                                 * skipped */
    char       *name;           /* Name of the subscription */
    Oid         owner;          /* Oid of the subscription owner */
    bool        ownersuperuser; /* Is the subscription owner a superuser? */
    bool        enabled;        /* Indicates if the subscription is enabled */
    bool        binary;         /* Indicates if the subscription wants data in
                                 * binary format */
    char        stream;         /* Allow streaming in-progress transactions.
                                 * See LOGICALREP_STREAM_xxx constants. */
    char        twophasestate;  /* Allow streaming two-phase transactions */
    bool        disableonerr;   /* Indicates if the subscription should be
                                 * automatically disabled if a worker error
                                 * occurs */
    bool        passwordrequired;   /* Must connection use a password? */
    bool        runasowner;     /* Run replication as subscription owner */
    bool        failover;       /* True if the associated replication slots
                                 * (i.e. the main slot and the table sync
                                 * slots) in the upstream database are enabled
                                 * to be synchronized to the standbys. */
    bool        retaindeadtuples;   /* True if dead tuples useful for conflict
                                     * detection are retained */
    int32       maxretention;   /* The maximum duration (in milliseconds) for
                                 * which information useful for conflict
                                 * detection can be retained */
    bool        retentionactive;    /* True if retain_dead_tuples is enabled
                                     * and the retention duration has not
                                     * exceeded max_retention_duration, when
                                     * defined */
    char       *conninfo;       /* Connection string to the publisher */
    char       *slotname;       /* Name of the replication slot */
    char       *synccommit;     /* Synchronous commit setting for worker */
    char       *walrcvtimeout;  /* wal_receiver_timeout setting for worker */
    List       *publications;   /* List of publication names to subscribe to */
    char       *origin;         /* Only publish data originating from the
                                 * specified origin */
} Subscription;
 
#ifdef EXPOSE_TO_CLIENT_CODE
 
/*
 * two_phase tri-state values. See comments atop worker.c to know more about
 * these states.
 */
#define LOGICALREP_TWOPHASE_STATE_DISABLED 'd'
#define LOGICALREP_TWOPHASE_STATE_PENDING 'p'
#define LOGICALREP_TWOPHASE_STATE_ENABLED 'e'
 
/*
 * The subscription will request the publisher to only send changes that do not
 * have any origin.
 */
#define LOGICALREP_ORIGIN_NONE "none"
 
/*
 * The subscription will request the publisher to send changes regardless
 * of their origin.
 */
#define LOGICALREP_ORIGIN_ANY "any"
 
/* Disallow streaming in-progress transactions. */
#define LOGICALREP_STREAM_OFF 'f'
 
/*
 * Streaming in-progress transactions are written to a temporary file and
 * applied only after the transaction is committed on upstream.
 */
#define LOGICALREP_STREAM_ON 't'
 
/*
 * Streaming in-progress transactions are applied immediately via a parallel
 * apply worker.
 */
#define LOGICALREP_STREAM_PARALLEL 'p'
 
#endif                          /* EXPOSE_TO_CLIENT_CODE */
 
extern Subscription *GetSubscription(Oid subid, bool missing_ok,
                                     bool aclcheck);
extern void DisableSubscription(Oid subid);
 
extern int  CountDBSubscriptions(Oid dbid);
 
extern void GetPublicationsStr(List *publications, StringInfo dest,
                               bool quote_literal);
 
#endif                          /* PG_SUBSCRIPTION_H */