subscriptioncmds.c File Reference

#include "postgres.h"
#include "access/htup_details.h"
#include "access/table.h"
#include "access/xact.h"
#include "catalog/catalog.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
#include "catalog/objectaccess.h"
#include "catalog/objectaddress.h"
#include "catalog/pg_subscription.h"
#include "catalog/pg_subscription_rel.h"
#include "catalog/pg_type.h"
#include "commands/defrem.h"
#include "commands/event_trigger.h"
#include "commands/subscriptioncmds.h"
#include "executor/executor.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "replication/logicallauncher.h"
#include "replication/origin.h"
#include "replication/slot.h"
#include "replication/walreceiver.h"
#include "replication/walsender.h"
#include "replication/worker_internal.h"
#include "storage/lmgr.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/guc.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/syscache.h"

Include dependency graph for subscriptioncmds.c:

Go to the source code of this file.

Functions
static List *	fetch_table_list (WalReceiverConn *wrconn, List *publications)
static void	check_duplicates_in_publist (List *publist, Datum *datums)
static List *	merge_publications (List *oldpublist, List *newpublist, bool addpub, const char *subname)
static void	ReportSlotConnectionError (List *rstates, Oid subid, char *slotname, char *err)
static void	parse_subscription_options (List *options, bool *connect, bool *enabled_given, bool *enabled, bool *create_slot, bool *slot_name_given, char **slot_name, bool *copy_data, char **synchronous_commit, bool *refresh, bool *binary_given, bool *binary, bool *streaming_given, bool *streaming)
static Datum	publicationListToArray (List *publist)
ObjectAddress	CreateSubscription (CreateSubscriptionStmt *stmt, bool isTopLevel)
static void	AlterSubscription_refresh (Subscription *sub, bool copy_data)
ObjectAddress	AlterSubscription (AlterSubscriptionStmt *stmt, bool isTopLevel)
void	DropSubscription (DropSubscriptionStmt *stmt, bool isTopLevel)
void	ReplicationSlotDropAtPubNode (WalReceiverConn *wrconn, char *slotname, bool missing_ok)
static void	AlterSubscriptionOwner_internal (Relation rel, HeapTuple tup, Oid newOwnerId)
ObjectAddress	AlterSubscriptionOwner (const char *name, Oid newOwnerId)
void	AlterSubscriptionOwner_oid (Oid subid, Oid newOwnerId)

Function Documentation

AlterSubscription()

ObjectAddress AlterSubscription	(	AlterSubscriptionStmt *	stmt,
		bool	isTopLevel
	)

Definition at line 753 of file subscriptioncmds.c.

References AccessExclusiveLock, aclcheck_error(), ACLCHECK_NOT_OWNER, ALTER_SUBSCRIPTION_ADD_PUBLICATION, ALTER_SUBSCRIPTION_CONNECTION, ALTER_SUBSCRIPTION_DROP_PUBLICATION, ALTER_SUBSCRIPTION_ENABLED, ALTER_SUBSCRIPTION_OPTIONS, ALTER_SUBSCRIPTION_REFRESH, ALTER_SUBSCRIPTION_SET_PUBLICATION, AlterSubscription_refresh(), ApplyLauncherWakeupAtCommit(), Assert, BoolGetDatum, CatalogTupleUpdate(), AlterSubscriptionStmt::conninfo, CStringGetDatum, CStringGetTextDatum, DirectFunctionCall1, elog, Subscription::enabled, ereport, errcode(), errhint(), errmsg(), ERROR, GETSTRUCT, GetSubscription(), GetUserId(), heap_freetuple(), heap_modify_tuple(), HeapTupleIsValid, InvokeObjectPostAlterHook, AlterSubscriptionStmt::kind, load_file(), LockSharedObject(), merge_publications(), MyDatabaseId, namein(), OBJECT_SUBSCRIPTION, ObjectAddressSet, AlterSubscriptionStmt::options, parse_subscription_options(), pg_subscription_ownercheck(), PreventInTransactionBlock(), AlterSubscriptionStmt::publication, publicationListToArray(), Subscription::publications, RelationGetDescr, RowExclusiveLock, SearchSysCacheCopy2, Subscription::slotname, AlterSubscriptionStmt::subname, SUBSCRIPTIONNAME, synchronous_commit, HeapTupleData::t_self, table_close(), table_open(), values, and walrcv_check_conninfo.

Referenced by ProcessUtilitySlow().

{
    Relation    rel;
    ObjectAddress myself;
    bool        nulls[Natts_pg_subscription];
    bool        replaces[Natts_pg_subscription];
    Datum       values[Natts_pg_subscription];
    HeapTuple   tup;
    Oid         subid;
    bool        update_tuple = false;
    Subscription *sub;
    Form_pg_subscription form;

    rel = table_open(SubscriptionRelationId, RowExclusiveLock);

    /* Fetch the existing tuple. */
    tup = SearchSysCacheCopy2(SUBSCRIPTIONNAME, MyDatabaseId,
                              CStringGetDatum(stmt->subname));

    if (!HeapTupleIsValid(tup))
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_OBJECT),
                 errmsg("subscription \"%s\" does not exist",
                        stmt->subname)));

    form = (Form_pg_subscription) GETSTRUCT(tup);
    subid = form->oid;

    /* must be owner */
    if (!pg_subscription_ownercheck(subid, GetUserId()))
        aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_SUBSCRIPTION,
                       stmt->subname);

    sub = GetSubscription(subid, false);

    /* Lock the subscription so nobody else can do anything with it. */
    LockSharedObject(SubscriptionRelationId, subid, 0, AccessExclusiveLock);

    /* Form a new tuple. */
    memset(values, 0, sizeof(values));
    memset(nulls, false, sizeof(nulls));
    memset(replaces, false, sizeof(replaces));

    switch (stmt->kind)
    {
        case ALTER_SUBSCRIPTION_OPTIONS:
            {
                char       *slotname;
                bool        slotname_given;
                char       *synchronous_commit;
                bool        binary_given;
                bool        binary;
                bool        streaming_given;
                bool        streaming;

                parse_subscription_options(stmt->options,
                                           NULL,    /* no "connect" */
                                           NULL, NULL,  /* no "enabled" */
                                           NULL,    /* no "create_slot" */
                                           &slotname_given, &slotname,
                                           NULL,    /* no "copy_data" */
                                           &synchronous_commit,
                                           NULL,    /* no "refresh" */
                                           &binary_given, &binary,
                                           &streaming_given, &streaming);

                if (slotname_given)
                {
                    if (sub->enabled && !slotname)
                        ereport(ERROR,
                                (errcode(ERRCODE_SYNTAX_ERROR),
                                 errmsg("cannot set %s for enabled subscription",
                                        "slot_name = NONE")));

                    if (slotname)
                        values[Anum_pg_subscription_subslotname - 1] =
                            DirectFunctionCall1(namein, CStringGetDatum(slotname));
                    else
                        nulls[Anum_pg_subscription_subslotname - 1] = true;
                    replaces[Anum_pg_subscription_subslotname - 1] = true;
                }

                if (synchronous_commit)
                {
                    values[Anum_pg_subscription_subsynccommit - 1] =
                        CStringGetTextDatum(synchronous_commit);
                    replaces[Anum_pg_subscription_subsynccommit - 1] = true;
                }

                if (binary_given)
                {
                    values[Anum_pg_subscription_subbinary - 1] =
                        BoolGetDatum(binary);
                    replaces[Anum_pg_subscription_subbinary - 1] = true;
                }

                if (streaming_given)
                {
                    values[Anum_pg_subscription_substream - 1] =
                        BoolGetDatum(streaming);
                    replaces[Anum_pg_subscription_substream - 1] = true;
                }

                update_tuple = true;
                break;
            }

        case ALTER_SUBSCRIPTION_ENABLED:
            {
                bool        enabled,
                            enabled_given;

                parse_subscription_options(stmt->options,
                                           NULL,    /* no "connect" */
                                           &enabled_given, &enabled,
                                           NULL,    /* no "create_slot" */
                                           NULL, NULL,  /* no "slot_name" */
                                           NULL,    /* no "copy_data" */
                                           NULL,    /* no "synchronous_commit" */
                                           NULL,    /* no "refresh" */
                                           NULL, NULL,  /* no "binary" */
                                           NULL, NULL); /* no streaming */
                Assert(enabled_given);

                if (!sub->slotname && enabled)
                    ereport(ERROR,
                            (errcode(ERRCODE_SYNTAX_ERROR),
                             errmsg("cannot enable subscription that does not have a slot name")));

                values[Anum_pg_subscription_subenabled - 1] =
                    BoolGetDatum(enabled);
                replaces[Anum_pg_subscription_subenabled - 1] = true;

                if (enabled)
                    ApplyLauncherWakeupAtCommit();

                update_tuple = true;
                break;
            }

        case ALTER_SUBSCRIPTION_CONNECTION:
            /* Load the library providing us libpq calls. */
            load_file("libpqwalreceiver", false);
            /* Check the connection info string. */
            walrcv_check_conninfo(stmt->conninfo);

            values[Anum_pg_subscription_subconninfo - 1] =
                CStringGetTextDatum(stmt->conninfo);
            replaces[Anum_pg_subscription_subconninfo - 1] = true;
            update_tuple = true;
            break;

        case ALTER_SUBSCRIPTION_SET_PUBLICATION:
            {
                bool        copy_data;
                bool        refresh;

                parse_subscription_options(stmt->options,
                                           NULL,    /* no "connect" */
                                           NULL, NULL,  /* no "enabled" */
                                           NULL,    /* no "create_slot" */
                                           NULL, NULL,  /* no "slot_name" */
                                           &copy_data,
                                           NULL,    /* no "synchronous_commit" */
                                           &refresh,
                                           NULL, NULL,  /* no "binary" */
                                           NULL, NULL); /* no "streaming" */
                values[Anum_pg_subscription_subpublications - 1] =
                    publicationListToArray(stmt->publication);
                replaces[Anum_pg_subscription_subpublications - 1] = true;

                update_tuple = true;

                /* Refresh if user asked us to. */
                if (refresh)
                {
                    if (!sub->enabled)
                        ereport(ERROR,
                                (errcode(ERRCODE_SYNTAX_ERROR),
                                 errmsg("ALTER SUBSCRIPTION with refresh is not allowed for disabled subscriptions"),
                                 errhint("Use ALTER SUBSCRIPTION ... SET PUBLICATION ... WITH (refresh = false).")));

                    PreventInTransactionBlock(isTopLevel, "ALTER SUBSCRIPTION with refresh");

                    /* Make sure refresh sees the new list of publications. */
                    sub->publications = stmt->publication;

                    AlterSubscription_refresh(sub, copy_data);
                }

                break;
            }

        case ALTER_SUBSCRIPTION_ADD_PUBLICATION:
        case ALTER_SUBSCRIPTION_DROP_PUBLICATION:
            {
                bool        isadd = stmt->kind == ALTER_SUBSCRIPTION_ADD_PUBLICATION;
                bool        copy_data;
                bool        refresh;
                List       *publist;

                publist = merge_publications(sub->publications, stmt->publication, isadd, stmt->subname);

                parse_subscription_options(stmt->options,
                                           NULL,    /* no "connect" */
                                           NULL, NULL,  /* no "enabled" */
                                           NULL,    /* no "create_slot" */
                                           NULL, NULL,  /* no "slot_name" */
                                           isadd ? &copy_data : NULL,   /* for drop, no
                                                                         * "copy_data" */
                                           NULL,    /* no "synchronous_commit" */
                                           &refresh,
                                           NULL, NULL,  /* no "binary" */
                                           NULL, NULL); /* no "streaming" */

                values[Anum_pg_subscription_subpublications - 1] =
                    publicationListToArray(publist);
                replaces[Anum_pg_subscription_subpublications - 1] = true;

                update_tuple = true;

                /* Refresh if user asked us to. */
                if (refresh)
                {
                    if (!sub->enabled)
                        ereport(ERROR,
                                (errcode(ERRCODE_SYNTAX_ERROR),
                                 errmsg("ALTER SUBSCRIPTION with refresh is not allowed for disabled subscriptions"),
                                 errhint("Use ALTER SUBSCRIPTION ... SET PUBLICATION ... WITH (refresh = false).")));

                    PreventInTransactionBlock(isTopLevel, "ALTER SUBSCRIPTION with refresh");

                    /* Only refresh the added/dropped list of publications. */
                    sub->publications = stmt->publication;

                    AlterSubscription_refresh(sub, copy_data);
                }

                break;
            }

        case ALTER_SUBSCRIPTION_REFRESH:
            {
                bool        copy_data;

                if (!sub->enabled)
                    ereport(ERROR,
                            (errcode(ERRCODE_SYNTAX_ERROR),
                             errmsg("ALTER SUBSCRIPTION ... REFRESH is not allowed for disabled subscriptions")));

                parse_subscription_options(stmt->options,
                                           NULL,    /* no "connect" */
                                           NULL, NULL,  /* no "enabled" */
                                           NULL,    /* no "create_slot" */
                                           NULL, NULL,  /* no "slot_name" */
                                           &copy_data,
                                           NULL,    /* no "synchronous_commit" */
                                           NULL,    /* no "refresh" */
                                           NULL, NULL,  /* no "binary" */
                                           NULL, NULL); /* no "streaming" */

                PreventInTransactionBlock(isTopLevel, "ALTER SUBSCRIPTION ... REFRESH");

                AlterSubscription_refresh(sub, copy_data);

                break;
            }

        default:
            elog(ERROR, "unrecognized ALTER SUBSCRIPTION kind %d",
                 stmt->kind);
    }

    /* Update the catalog if needed. */
    if (update_tuple)
    {
        tup = heap_modify_tuple(tup, RelationGetDescr(rel), values, nulls,
                                replaces);

        CatalogTupleUpdate(rel, &tup->t_self, tup);

        heap_freetuple(tup);
    }

    table_close(rel, RowExclusiveLock);

    ObjectAddressSet(myself, SubscriptionRelationId, subid);

    InvokeObjectPostAlterHook(SubscriptionRelationId, subid, 0);

    return myself;
}

AlterSubscription_refresh()

static void AlterSubscription_refresh ( Subscription *  sub, bool  copy_data  )

static

Definition at line 542 of file subscriptioncmds.c.

References AccessExclusiveLock, AccessShareLock, AddSubscriptionRelState(), CheckSubscriptionRelkind(), Subscription::conninfo, DEBUG1, ereport, errmsg(), errmsg_internal(), ERROR, fetch_table_list(), get_namespace_name(), get_rel_name(), get_rel_namespace(), get_rel_relkind(), GetSubscriptionRelations(), GetSubscriptionRelState(), InvalidXLogRecPtr, lfirst, list_length(), load_file(), logicalrep_worker_stop(), Subscription::name, NAMEDATALEN, NoLock, Subscription::oid, oid_cmp(), palloc(), PG_END_TRY, PG_FINALLY, PG_TRY, Subscription::publications, qsort, RangeVarGetRelid, SubscriptionRelState::relid, RangeVar::relname, RemoveSubscriptionRel(), ReplicationOriginNameForTablesync(), ReplicationSlotDropAtPubNode(), ReplicationSlotNameForTablesync(), replorigin_drop_by_name(), RangeVar::schemaname, table_close(), table_open(), walrcv_connect, walrcv_disconnect, and wrconn.

Referenced by AlterSubscription().

{
    char       *err;
    List       *pubrel_names;
    List       *subrel_states;
    Oid        *subrel_local_oids;
    Oid        *pubrel_local_oids;
    ListCell   *lc;
    int         off;
    int         remove_rel_len;
    Relation    rel = NULL;
    typedef struct SubRemoveRels
    {
        Oid         relid;
        char        state;
    } SubRemoveRels;
    SubRemoveRels *sub_remove_rels;

    /* Load the library providing us libpq calls. */
    load_file("libpqwalreceiver", false);

    PG_TRY();
    {
        /* Try to connect to the publisher. */
        wrconn = walrcv_connect(sub->conninfo, true, sub->name, &err);
        if (!wrconn)
            ereport(ERROR,
                    (errmsg("could not connect to the publisher: %s", err)));

        /* Get the table list from publisher. */
        pubrel_names = fetch_table_list(wrconn, sub->publications);

        /* Get local table list. */
        subrel_states = GetSubscriptionRelations(sub->oid);

        /*
         * Build qsorted array of local table oids for faster lookup. This can
         * potentially contain all tables in the database so speed of lookup
         * is important.
         */
        subrel_local_oids = palloc(list_length(subrel_states) * sizeof(Oid));
        off = 0;
        foreach(lc, subrel_states)
        {
            SubscriptionRelState *relstate = (SubscriptionRelState *) lfirst(lc);

            subrel_local_oids[off++] = relstate->relid;
        }
        qsort(subrel_local_oids, list_length(subrel_states),
              sizeof(Oid), oid_cmp);

        /*
         * Rels that we want to remove from subscription and drop any slots
         * and origins corresponding to them.
         */
        sub_remove_rels = palloc(list_length(subrel_states) * sizeof(SubRemoveRels));

        /*
         * Walk over the remote tables and try to match them to locally known
         * tables. If the table is not known locally create a new state for
         * it.
         *
         * Also builds array of local oids of remote tables for the next step.
         */
        off = 0;
        pubrel_local_oids = palloc(list_length(pubrel_names) * sizeof(Oid));

        foreach(lc, pubrel_names)
        {
            RangeVar   *rv = (RangeVar *) lfirst(lc);
            Oid         relid;

            relid = RangeVarGetRelid(rv, AccessShareLock, false);

            /* Check for supported relkind. */
            CheckSubscriptionRelkind(get_rel_relkind(relid),
                                     rv->schemaname, rv->relname);

            pubrel_local_oids[off++] = relid;

            if (!bsearch(&relid, subrel_local_oids,
                         list_length(subrel_states), sizeof(Oid), oid_cmp))
            {
                AddSubscriptionRelState(sub->oid, relid,
                                        copy_data ? SUBREL_STATE_INIT : SUBREL_STATE_READY,
                                        InvalidXLogRecPtr);
                ereport(DEBUG1,
                        (errmsg_internal("table \"%s.%s\" added to subscription \"%s\"",
                                rv->schemaname, rv->relname, sub->name)));
            }
        }

        /*
         * Next remove state for tables we should not care about anymore using
         * the data we collected above
         */
        qsort(pubrel_local_oids, list_length(pubrel_names),
              sizeof(Oid), oid_cmp);

        remove_rel_len = 0;
        for (off = 0; off < list_length(subrel_states); off++)
        {
            Oid         relid = subrel_local_oids[off];

            if (!bsearch(&relid, pubrel_local_oids,
                         list_length(pubrel_names), sizeof(Oid), oid_cmp))
            {
                char        state;
                XLogRecPtr  statelsn;

                /*
                 * Lock pg_subscription_rel with AccessExclusiveLock to
                 * prevent any race conditions with the apply worker
                 * re-launching workers at the same time this code is trying
                 * to remove those tables.
                 *
                 * Even if new worker for this particular rel is restarted it
                 * won't be able to make any progress as we hold exclusive
                 * lock on subscription_rel till the transaction end. It will
                 * simply exit as there is no corresponding rel entry.
                 *
                 * This locking also ensures that the state of rels won't
                 * change till we are done with this refresh operation.
                 */
                if (!rel)
                    rel = table_open(SubscriptionRelRelationId, AccessExclusiveLock);

                /* Last known rel state. */
                state = GetSubscriptionRelState(sub->oid, relid, &statelsn);

                sub_remove_rels[remove_rel_len].relid = relid;
                sub_remove_rels[remove_rel_len++].state = state;

                RemoveSubscriptionRel(sub->oid, relid);

                logicalrep_worker_stop(sub->oid, relid);

                /*
                 * For READY state, we would have already dropped the
                 * tablesync origin.
                 */
                if (state != SUBREL_STATE_READY)
                {
                    char        originname[NAMEDATALEN];

                    /*
                     * Drop the tablesync's origin tracking if exists.
                     *
                     * It is possible that the origin is not yet created for
                     * tablesync worker, this can happen for the states before
                     * SUBREL_STATE_FINISHEDCOPY. The apply worker can also
                     * concurrently try to drop the origin and by this time
                     * the origin might be already removed. For these reasons,
                     * passing missing_ok = true.
                     */
                    ReplicationOriginNameForTablesync(sub->oid, relid, originname,
                                                      sizeof(originname));
                    replorigin_drop_by_name(originname, true, false);
                }

                ereport(DEBUG1,
                        (errmsg_internal("table \"%s.%s\" removed from subscription \"%s\"",
                                get_namespace_name(get_rel_namespace(relid)),
                                get_rel_name(relid),
                                sub->name)));
            }
        }

        /*
         * Drop the tablesync slots associated with removed tables. This has
         * to be at the end because otherwise if there is an error while doing
         * the database operations we won't be able to rollback dropped slots.
         */
        for (off = 0; off < remove_rel_len; off++)
        {
            if (sub_remove_rels[off].state != SUBREL_STATE_READY &&
                sub_remove_rels[off].state != SUBREL_STATE_SYNCDONE)
            {
                char        syncslotname[NAMEDATALEN] = {0};

                /*
                 * For READY/SYNCDONE states we know the tablesync slot has
                 * already been dropped by the tablesync worker.
                 *
                 * For other states, there is no certainty, maybe the slot
                 * does not exist yet. Also, if we fail after removing some of
                 * the slots, next time, it will again try to drop already
                 * dropped slots and fail. For these reasons, we allow
                 * missing_ok = true for the drop.
                 */
                ReplicationSlotNameForTablesync(sub->oid, sub_remove_rels[off].relid,
                                                syncslotname, sizeof(syncslotname));
                ReplicationSlotDropAtPubNode(wrconn, syncslotname, true);
            }
        }
    }
    PG_FINALLY();
    {
        if (wrconn)
            walrcv_disconnect(wrconn);
    }
    PG_END_TRY();

    if (rel)
        table_close(rel, NoLock);
}

AlterSubscriptionOwner()

ObjectAddress AlterSubscriptionOwner	(	const char *	name,
		Oid	newOwnerId
	)

Definition at line 1411 of file subscriptioncmds.c.

References AlterSubscriptionOwner_internal(), CStringGetDatum, ereport, errcode(), errmsg(), ERROR, GETSTRUCT, heap_freetuple(), HeapTupleIsValid, MyDatabaseId, ObjectAddressSet, RowExclusiveLock, SearchSysCacheCopy2, SUBSCRIPTIONNAME, table_close(), and table_open().

Referenced by ExecAlterOwnerStmt().

{
    Oid         subid;
    HeapTuple   tup;
    Relation    rel;
    ObjectAddress address;
    Form_pg_subscription form;

    rel = table_open(SubscriptionRelationId, RowExclusiveLock);

    tup = SearchSysCacheCopy2(SUBSCRIPTIONNAME, MyDatabaseId,
                              CStringGetDatum(name));

    if (!HeapTupleIsValid(tup))
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_OBJECT),
                 errmsg("subscription \"%s\" does not exist", name)));

    form = (Form_pg_subscription) GETSTRUCT(tup);
    subid = form->oid;

    AlterSubscriptionOwner_internal(rel, tup, newOwnerId);

    ObjectAddressSet(address, SubscriptionRelationId, subid);

    heap_freetuple(tup);

    table_close(rel, RowExclusiveLock);

    return address;
}

AlterSubscriptionOwner_internal()

static void AlterSubscriptionOwner_internal ( Relation  rel, HeapTuple  tup, Oid  newOwnerId  )

static

Definition at line 1374 of file subscriptioncmds.c.

References aclcheck_error(), ACLCHECK_NOT_OWNER, CatalogTupleUpdate(), changeDependencyOnOwner(), ereport, errcode(), errhint(), errmsg(), ERROR, GETSTRUCT, GetUserId(), InvokeObjectPostAlterHook, NameStr, OBJECT_SUBSCRIPTION, pg_subscription_ownercheck(), superuser_arg(), and HeapTupleData::t_self.

Referenced by AlterSubscriptionOwner(), and AlterSubscriptionOwner_oid().

{
    Form_pg_subscription form;

    form = (Form_pg_subscription) GETSTRUCT(tup);

    if (form->subowner == newOwnerId)
        return;

    if (!pg_subscription_ownercheck(form->oid, GetUserId()))
        aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_SUBSCRIPTION,
                       NameStr(form->subname));

    /* New owner must be a superuser */
    if (!superuser_arg(newOwnerId))
        ereport(ERROR,
                (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
                 errmsg("permission denied to change owner of subscription \"%s\"",
                        NameStr(form->subname)),
                 errhint("The owner of a subscription must be a superuser.")));

    form->subowner = newOwnerId;
    CatalogTupleUpdate(rel, &tup->t_self, tup);

    /* Update owner dependency reference */
    changeDependencyOnOwner(SubscriptionRelationId,
                            form->oid,
                            newOwnerId);

    InvokeObjectPostAlterHook(SubscriptionRelationId,
                              form->oid, 0);
}

AlterSubscriptionOwner_oid()

void AlterSubscriptionOwner_oid	(	Oid	subid,
		Oid	newOwnerId
	)

Definition at line 1447 of file subscriptioncmds.c.

References AlterSubscriptionOwner_internal(), ereport, errcode(), errmsg(), ERROR, heap_freetuple(), HeapTupleIsValid, ObjectIdGetDatum, RowExclusiveLock, SearchSysCacheCopy1, SUBSCRIPTIONOID, table_close(), and table_open().

Referenced by shdepReassignOwned().

{
    HeapTuple   tup;
    Relation    rel;

    rel = table_open(SubscriptionRelationId, RowExclusiveLock);

    tup = SearchSysCacheCopy1(SUBSCRIPTIONOID, ObjectIdGetDatum(subid));

    if (!HeapTupleIsValid(tup))
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_OBJECT),
                 errmsg("subscription with OID %u does not exist", subid)));

    AlterSubscriptionOwner_internal(rel, tup, newOwnerId);

    heap_freetuple(tup);

    table_close(rel, RowExclusiveLock);
}

check_duplicates_in_publist()

static void check_duplicates_in_publist ( List *  publist, Datum *  datums  )

static

Definition at line 1585 of file subscriptioncmds.c.

References CStringGetTextDatum, ereport, errcode(), errmsg(), ERROR, lfirst, name, and strVal.

Referenced by merge_publications(), and publicationListToArray().

{
    ListCell   *cell;
    int         j = 0;

    foreach(cell, publist)
    {
        char       *name = strVal(lfirst(cell));
        ListCell   *pcell;

        foreach(pcell, publist)
        {
            char       *pname = strVal(lfirst(pcell));

            if (pcell == cell)
                break;

            if (strcmp(name, pname) == 0)
                ereport(ERROR,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("publication name \"%s\" used more than once",
                                pname)));
        }

        if (datums)
            datums[j++] = CStringGetTextDatum(name);
    }
}

CreateSubscription()

ObjectAddress CreateSubscription	(	CreateSubscriptionStmt *	stmt,
		bool	isTopLevel
	)

Definition at line 325 of file subscriptioncmds.c.

References AccessShareLock, AddSubscriptionRelState(), ApplyLauncherWakeupAtCommit(), Assert, BoolGetDatum, CatalogTupleInsert(), CheckSubscriptionRelkind(), connect, CreateSubscriptionStmt::conninfo, create_slot, CRS_NOEXPORT_SNAPSHOT, CStringGetDatum, CStringGetTextDatum, DirectFunctionCall1, elog, ereport, errcode(), ERRCODE_DUPLICATE_OBJECT, errmsg(), ERROR, fetch_table_list(), get_rel_relkind(), GetNewOidWithIndex(), GetSysCacheOid2, GetUserId(), heap_form_tuple(), heap_freetuple(), InvalidXLogRecPtr, InvokeObjectPostCreateHook, lfirst, load_file(), MyDatabaseId, NAMEDATALEN, namein(), NOTICE, ObjectAddressSet, ObjectIdGetDatum, OidIsValid, CreateSubscriptionStmt::options, parse_subscription_options(), PG_END_TRY, PG_FINALLY, PG_TRY, PreventInTransactionBlock(), CreateSubscriptionStmt::publication, publicationListToArray(), RangeVarGetRelid, recordDependencyOnOwner(), RelationGetDescr, RangeVar::relname, replorigin_create(), RowExclusiveLock, RangeVar::schemaname, snprintf, CreateSubscriptionStmt::subname, SUBSCRIPTIONNAME, SubscriptionObjectIndexId, superuser(), synchronous_commit, table_close(), table_open(), values, walrcv_check_conninfo, walrcv_connect, walrcv_create_slot, walrcv_disconnect, WARNING, and wrconn.

Referenced by ProcessUtilitySlow().

{
    Relation    rel;
    ObjectAddress myself;
    Oid         subid;
    bool        nulls[Natts_pg_subscription];
    Datum       values[Natts_pg_subscription];
    Oid         owner = GetUserId();
    HeapTuple   tup;
    bool        connect;
    bool        enabled_given;
    bool        enabled;
    bool        copy_data;
    bool        streaming;
    bool        streaming_given;
    char       *synchronous_commit;
    char       *conninfo;
    char       *slotname;
    bool        slotname_given;
    bool        binary;
    bool        binary_given;
    char        originname[NAMEDATALEN];
    bool        create_slot;
    List       *publications;

    /*
     * Parse and check options.
     *
     * Connection and publication should not be specified here.
     */
    parse_subscription_options(stmt->options,
                               &connect,
                               &enabled_given, &enabled,
                               &create_slot,
                               &slotname_given, &slotname,
                               &copy_data,
                               &synchronous_commit,
                               NULL,    /* no "refresh" */
                               &binary_given, &binary,
                               &streaming_given, &streaming);

    /*
     * Since creating a replication slot is not transactional, rolling back
     * the transaction leaves the created replication slot.  So we cannot run
     * CREATE SUBSCRIPTION inside a transaction block if creating a
     * replication slot.
     */
    if (create_slot)
        PreventInTransactionBlock(isTopLevel, "CREATE SUBSCRIPTION ... WITH (create_slot = true)");

    if (!superuser())
        ereport(ERROR,
                (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
                 errmsg("must be superuser to create subscriptions")));

    /*
     * If built with appropriate switch, whine when regression-testing
     * conventions for subscription names are violated.
     */
#ifdef ENFORCE_REGRESSION_TEST_NAME_RESTRICTIONS
    if (strncmp(stmt->subname, "regress_", 8) != 0)
        elog(WARNING, "subscriptions created by regression test cases should have names starting with \"regress_\"");
#endif

    rel = table_open(SubscriptionRelationId, RowExclusiveLock);

    /* Check if name is used */
    subid = GetSysCacheOid2(SUBSCRIPTIONNAME, Anum_pg_subscription_oid,
                            MyDatabaseId, CStringGetDatum(stmt->subname));
    if (OidIsValid(subid))
    {
        ereport(ERROR,
                (errcode(ERRCODE_DUPLICATE_OBJECT),
                 errmsg("subscription \"%s\" already exists",
                        stmt->subname)));
    }

    if (!slotname_given && slotname == NULL)
        slotname = stmt->subname;

    /* The default for synchronous_commit of subscriptions is off. */
    if (synchronous_commit == NULL)
        synchronous_commit = "off";

    conninfo = stmt->conninfo;
    publications = stmt->publication;

    /* Load the library providing us libpq calls. */
    load_file("libpqwalreceiver", false);

    /* Check the connection info string. */
    walrcv_check_conninfo(conninfo);

    /* Everything ok, form a new tuple. */
    memset(values, 0, sizeof(values));
    memset(nulls, false, sizeof(nulls));

    subid = GetNewOidWithIndex(rel, SubscriptionObjectIndexId,
                               Anum_pg_subscription_oid);
    values[Anum_pg_subscription_oid - 1] = ObjectIdGetDatum(subid);
    values[Anum_pg_subscription_subdbid - 1] = ObjectIdGetDatum(MyDatabaseId);
    values[Anum_pg_subscription_subname - 1] =
        DirectFunctionCall1(namein, CStringGetDatum(stmt->subname));
    values[Anum_pg_subscription_subowner - 1] = ObjectIdGetDatum(owner);
    values[Anum_pg_subscription_subenabled - 1] = BoolGetDatum(enabled);
    values[Anum_pg_subscription_subbinary - 1] = BoolGetDatum(binary);
    values[Anum_pg_subscription_substream - 1] = BoolGetDatum(streaming);
    values[Anum_pg_subscription_subconninfo - 1] =
        CStringGetTextDatum(conninfo);
    if (slotname)
        values[Anum_pg_subscription_subslotname - 1] =
            DirectFunctionCall1(namein, CStringGetDatum(slotname));
    else
        nulls[Anum_pg_subscription_subslotname - 1] = true;
    values[Anum_pg_subscription_subsynccommit - 1] =
        CStringGetTextDatum(synchronous_commit);
    values[Anum_pg_subscription_subpublications - 1] =
        publicationListToArray(publications);

    tup = heap_form_tuple(RelationGetDescr(rel), values, nulls);

    /* Insert tuple into catalog. */
    CatalogTupleInsert(rel, tup);
    heap_freetuple(tup);

    recordDependencyOnOwner(SubscriptionRelationId, subid, owner);

    snprintf(originname, sizeof(originname), "pg_%u", subid);
    replorigin_create(originname);

    /*
     * Connect to remote side to execute requested commands and fetch table
     * info.
     */
    if (connect)
    {
        char       *err;
        WalReceiverConn *wrconn;
        List       *tables;
        ListCell   *lc;
        char        table_state;

        /* Try to connect to the publisher. */
        wrconn = walrcv_connect(conninfo, true, stmt->subname, &err);
        if (!wrconn)
            ereport(ERROR,
                    (errmsg("could not connect to the publisher: %s", err)));

        PG_TRY();
        {
            /*
             * Set sync state based on if we were asked to do data copy or
             * not.
             */
            table_state = copy_data ? SUBREL_STATE_INIT : SUBREL_STATE_READY;

            /*
             * Get the table list from publisher and build local table status
             * info.
             */
            tables = fetch_table_list(wrconn, publications);
            foreach(lc, tables)
            {
                RangeVar   *rv = (RangeVar *) lfirst(lc);
                Oid         relid;

                relid = RangeVarGetRelid(rv, AccessShareLock, false);

                /* Check for supported relkind. */
                CheckSubscriptionRelkind(get_rel_relkind(relid),
                                         rv->schemaname, rv->relname);

                AddSubscriptionRelState(subid, relid, table_state,
                                        InvalidXLogRecPtr);
            }

            /*
             * If requested, create permanent slot for the subscription. We
             * won't use the initial snapshot for anything, so no need to
             * export it.
             */
            if (create_slot)
            {
                Assert(slotname);

                walrcv_create_slot(wrconn, slotname, false,
                                   CRS_NOEXPORT_SNAPSHOT, NULL);
                ereport(NOTICE,
                        (errmsg("created replication slot \"%s\" on publisher",
                                slotname)));
            }
        }
        PG_FINALLY();
        {
            walrcv_disconnect(wrconn);
        }
        PG_END_TRY();
    }
    else
        ereport(WARNING,
        /* translator: %s is an SQL ALTER statement */
                (errmsg("tables were not subscribed, you will have to run %s to subscribe the tables",
                        "ALTER SUBSCRIPTION ... REFRESH PUBLICATION")));

    table_close(rel, RowExclusiveLock);

    if (enabled)
        ApplyLauncherWakeupAtCommit();

    ObjectAddressSet(myself, SubscriptionRelationId, subid);

    InvokeObjectPostCreateHook(SubscriptionRelationId, subid, 0);

    return myself;
}

DropSubscription()

void DropSubscription	(	DropSubscriptionStmt *	stmt,
		bool	isTopLevel
	)

Definition at line 1050 of file subscriptioncmds.c.

References AccessExclusiveLock, aclcheck_error(), ACLCHECK_NOT_OWNER, Assert, CatalogTupleDelete(), CStringGetDatum, DatumGetName, deleteSharedDependencyRecordsFor(), ereport, errcode(), errmsg(), ERROR, EventTriggerSQLDropAddObject(), GETSTRUCT, GetSubscriptionNotReadyRelations(), GetUserId(), HeapTupleIsValid, InvalidOid, InvokeObjectDropHook, lfirst, list_free(), load_file(), LockSharedObject(), logicalrep_worker_stop(), logicalrep_workers_find(), LW_SHARED, LWLockAcquire(), LWLockRelease(), DropSubscriptionStmt::missing_ok, MyDatabaseId, NAMEDATALEN, NameStr, NIL, NoLock, NOTICE, OBJECT_SUBSCRIPTION, ObjectAddressSet, OidIsValid, PG_END_TRY, PG_FINALLY, pg_subscription_ownercheck(), PG_TRY, PreventInTransactionBlock(), pstrdup(), ReleaseSysCache(), LogicalRepWorker::relid, SubscriptionRelState::relid, RemoveSubscriptionRel(), ReplicationOriginNameForTablesync(), ReplicationSlotDropAtPubNode(), ReplicationSlotNameForTablesync(), replorigin_drop_by_name(), ReportSlotConnectionError(), SearchSysCache2(), snprintf, SubscriptionRelState::state, LogicalRepWorker::subid, subname, DropSubscriptionStmt::subname, SUBSCRIPTIONNAME, SUBSCRIPTIONOID, SysCacheGetAttr(), HeapTupleData::t_self, table_close(), table_open(), TextDatumGetCString, walrcv_connect, walrcv_disconnect, and wrconn.

Referenced by ProcessUtilitySlow().

{
    Relation    rel;
    ObjectAddress myself;
    HeapTuple   tup;
    Oid         subid;
    Datum       datum;
    bool        isnull;
    char       *subname;
    char       *conninfo;
    char       *slotname;
    List       *subworkers;
    ListCell   *lc;
    char        originname[NAMEDATALEN];
    char       *err = NULL;
    WalReceiverConn *wrconn = NULL;
    Form_pg_subscription form;
    List       *rstates;

    /*
     * Lock pg_subscription with AccessExclusiveLock to ensure that the
     * launcher doesn't restart new worker during dropping the subscription
     */
    rel = table_open(SubscriptionRelationId, AccessExclusiveLock);

    tup = SearchSysCache2(SUBSCRIPTIONNAME, MyDatabaseId,
                          CStringGetDatum(stmt->subname));

    if (!HeapTupleIsValid(tup))
    {
        table_close(rel, NoLock);

        if (!stmt->missing_ok)
            ereport(ERROR,
                    (errcode(ERRCODE_UNDEFINED_OBJECT),
                     errmsg("subscription \"%s\" does not exist",
                            stmt->subname)));
        else
            ereport(NOTICE,
                    (errmsg("subscription \"%s\" does not exist, skipping",
                            stmt->subname)));

        return;
    }

    form = (Form_pg_subscription) GETSTRUCT(tup);
    subid = form->oid;

    /* must be owner */
    if (!pg_subscription_ownercheck(subid, GetUserId()))
        aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_SUBSCRIPTION,
                       stmt->subname);

    /* DROP hook for the subscription being removed */
    InvokeObjectDropHook(SubscriptionRelationId, subid, 0);

    /*
     * Lock the subscription so nobody else can do anything with it (including
     * the replication workers).
     */
    LockSharedObject(SubscriptionRelationId, subid, 0, AccessExclusiveLock);

    /* Get subname */
    datum = SysCacheGetAttr(SUBSCRIPTIONOID, tup,
                            Anum_pg_subscription_subname, &isnull);
    Assert(!isnull);
    subname = pstrdup(NameStr(*DatumGetName(datum)));

    /* Get conninfo */
    datum = SysCacheGetAttr(SUBSCRIPTIONOID, tup,
                            Anum_pg_subscription_subconninfo, &isnull);
    Assert(!isnull);
    conninfo = TextDatumGetCString(datum);

    /* Get slotname */
    datum = SysCacheGetAttr(SUBSCRIPTIONOID, tup,
                            Anum_pg_subscription_subslotname, &isnull);
    if (!isnull)
        slotname = pstrdup(NameStr(*DatumGetName(datum)));
    else
        slotname = NULL;

    /*
     * Since dropping a replication slot is not transactional, the replication
     * slot stays dropped even if the transaction rolls back.  So we cannot
     * run DROP SUBSCRIPTION inside a transaction block if dropping the
     * replication slot.
     *
     * XXX The command name should really be something like "DROP SUBSCRIPTION
     * of a subscription that is associated with a replication slot", but we
     * don't have the proper facilities for that.
     */
    if (slotname)
        PreventInTransactionBlock(isTopLevel, "DROP SUBSCRIPTION");

    ObjectAddressSet(myself, SubscriptionRelationId, subid);
    EventTriggerSQLDropAddObject(&myself, true, true);

    /* Remove the tuple from catalog. */
    CatalogTupleDelete(rel, &tup->t_self);

    ReleaseSysCache(tup);

    /*
     * Stop all the subscription workers immediately.
     *
     * This is necessary if we are dropping the replication slot, so that the
     * slot becomes accessible.
     *
     * It is also necessary if the subscription is disabled and was disabled
     * in the same transaction.  Then the workers haven't seen the disabling
     * yet and will still be running, leading to hangs later when we want to
     * drop the replication origin.  If the subscription was disabled before
     * this transaction, then there shouldn't be any workers left, so this
     * won't make a difference.
     *
     * New workers won't be started because we hold an exclusive lock on the
     * subscription till the end of the transaction.
     */
    LWLockAcquire(LogicalRepWorkerLock, LW_SHARED);
    subworkers = logicalrep_workers_find(subid, false);
    LWLockRelease(LogicalRepWorkerLock);
    foreach(lc, subworkers)
    {
        LogicalRepWorker *w = (LogicalRepWorker *) lfirst(lc);

        logicalrep_worker_stop(w->subid, w->relid);
    }
    list_free(subworkers);

    /*
     * Cleanup of tablesync replication origins.
     *
     * Any READY-state relations would already have dealt with clean-ups.
     *
     * Note that the state can't change because we have already stopped both
     * the apply and tablesync workers and they can't restart because of
     * exclusive lock on the subscription.
     */
    rstates = GetSubscriptionNotReadyRelations(subid);
    foreach(lc, rstates)
    {
        SubscriptionRelState *rstate = (SubscriptionRelState *) lfirst(lc);
        Oid         relid = rstate->relid;

        /* Only cleanup resources of tablesync workers */
        if (!OidIsValid(relid))
            continue;

        /*
         * Drop the tablesync's origin tracking if exists.
         *
         * It is possible that the origin is not yet created for tablesync
         * worker so passing missing_ok = true. This can happen for the states
         * before SUBREL_STATE_FINISHEDCOPY.
         */
        ReplicationOriginNameForTablesync(subid, relid, originname,
                                          sizeof(originname));
        replorigin_drop_by_name(originname, true, false);
    }

    /* Clean up dependencies */
    deleteSharedDependencyRecordsFor(SubscriptionRelationId, subid, 0);

    /* Remove any associated relation synchronization states. */
    RemoveSubscriptionRel(subid, InvalidOid);

    /* Remove the origin tracking if exists. */
    snprintf(originname, sizeof(originname), "pg_%u", subid);
    replorigin_drop_by_name(originname, true, false);

    /*
     * If there is no slot associated with the subscription, we can finish
     * here.
     */
    if (!slotname && rstates == NIL)
    {
        table_close(rel, NoLock);
        return;
    }

    /*
     * Try to acquire the connection necessary for dropping slots.
     *
     * Note: If the slotname is NONE/NULL then we allow the command to finish
     * and users need to manually cleanup the apply and tablesync worker slots
     * later.
     *
     * This has to be at the end because otherwise if there is an error while
     * doing the database operations we won't be able to rollback dropped
     * slot.
     */
    load_file("libpqwalreceiver", false);

    wrconn = walrcv_connect(conninfo, true, subname, &err);
    if (wrconn == NULL)
    {
        if (!slotname)
        {
            /* be tidy */
            list_free(rstates);
            table_close(rel, NoLock);
            return;
        }
        else
        {
            ReportSlotConnectionError(rstates, subid, slotname, err);
        }
    }

    PG_TRY();
    {
        foreach(lc, rstates)
        {
            SubscriptionRelState *rstate = (SubscriptionRelState *) lfirst(lc);
            Oid         relid = rstate->relid;

            /* Only cleanup resources of tablesync workers */
            if (!OidIsValid(relid))
                continue;

            /*
             * Drop the tablesync slots associated with removed tables.
             *
             * For SYNCDONE/READY states, the tablesync slot is known to have
             * already been dropped by the tablesync worker.
             *
             * For other states, there is no certainty, maybe the slot does
             * not exist yet. Also, if we fail after removing some of the
             * slots, next time, it will again try to drop already dropped
             * slots and fail. For these reasons, we allow missing_ok = true
             * for the drop.
             */
            if (rstate->state != SUBREL_STATE_SYNCDONE)
            {
                char        syncslotname[NAMEDATALEN] = {0};

                ReplicationSlotNameForTablesync(subid, relid, syncslotname,
                                                sizeof(syncslotname));
                ReplicationSlotDropAtPubNode(wrconn, syncslotname, true);
            }
        }

        list_free(rstates);

        /*
         * If there is a slot associated with the subscription, then drop the
         * replication slot at the publisher.
         */
        if (slotname)
            ReplicationSlotDropAtPubNode(wrconn, slotname, false);

    }
    PG_FINALLY();
    {
        walrcv_disconnect(wrconn);
    }
    PG_END_TRY();

    table_close(rel, NoLock);
}

fetch_table_list()

static List * fetch_table_list ( WalReceiverConn *  wrconn, List *  publications  )

static

Definition at line 1473 of file subscriptioncmds.c.

References appendStringInfoChar(), appendStringInfoString(), Assert, StringInfoData::data, ereport, WalRcvExecResult::err, errmsg(), ERROR, ExecClearTuple(), ExecDropSingleTupleTableSlot(), initStringInfo(), lappend(), lfirst, list_length(), makeRangeVar(), MakeSingleTupleTableSlot(), NIL, pfree(), quote_literal_cstr(), relname, slot_getattr(), WalRcvExecResult::status, strVal, TextDatumGetCString, TTSOpsMinimalTuple, WalRcvExecResult::tupledesc, WalRcvExecResult::tuplestore, tuplestore_gettupleslot(), walrcv_clear_result(), walrcv_exec, and WALRCV_OK_TUPLES.

Referenced by AlterSubscription_refresh(), and CreateSubscription().

{
    WalRcvExecResult *res;
    StringInfoData cmd;
    TupleTableSlot *slot;
    Oid         tableRow[2] = {TEXTOID, TEXTOID};
    ListCell   *lc;
    bool        first;
    List       *tablelist = NIL;

    Assert(list_length(publications) > 0);

    initStringInfo(&cmd);
    appendStringInfoString(&cmd, "SELECT DISTINCT t.schemaname, t.tablename\n"
                           "  FROM pg_catalog.pg_publication_tables t\n"
                           " WHERE t.pubname IN (");
    first = true;
    foreach(lc, publications)
    {
        char       *pubname = strVal(lfirst(lc));

        if (first)
            first = false;
        else
            appendStringInfoString(&cmd, ", ");

        appendStringInfoString(&cmd, quote_literal_cstr(pubname));
    }
    appendStringInfoChar(&cmd, ')');

    res = walrcv_exec(wrconn, cmd.data, 2, tableRow);
    pfree(cmd.data);

    if (res->status != WALRCV_OK_TUPLES)
        ereport(ERROR,
                (errmsg("could not receive list of replicated tables from the publisher: %s",
                        res->err)));

    /* Process tables. */
    slot = MakeSingleTupleTableSlot(res->tupledesc, &TTSOpsMinimalTuple);
    while (tuplestore_gettupleslot(res->tuplestore, true, false, slot))
    {
        char       *nspname;
        char       *relname;
        bool        isnull;
        RangeVar   *rv;

        nspname = TextDatumGetCString(slot_getattr(slot, 1, &isnull));
        Assert(!isnull);
        relname = TextDatumGetCString(slot_getattr(slot, 2, &isnull));
        Assert(!isnull);

        rv = makeRangeVar(nspname, relname, -1);
        tablelist = lappend(tablelist, rv);

        ExecClearTuple(slot);
    }
    ExecDropSingleTupleTableSlot(slot);

    walrcv_clear_result(res);

    return tablelist;
}

merge_publications()

static List * merge_publications ( List *  oldpublist, List *  newpublist, bool  addpub, const char *  subname  )

static

Definition at line 1625 of file subscriptioncmds.c.

References check_duplicates_in_publist(), ereport, errcode(), ERRCODE_DUPLICATE_OBJECT, errmsg(), ERROR, foreach_delete_current, lappend(), lfirst, list_copy(), makeString(), name, and strVal.

Referenced by AlterSubscription().

{
    ListCell   *lc;

    oldpublist = list_copy(oldpublist);

    check_duplicates_in_publist(newpublist, NULL);

    foreach(lc, newpublist)
    {
        char       *name = strVal(lfirst(lc));
        ListCell   *lc2;
        bool        found = false;

        foreach(lc2, oldpublist)
        {
            char       *pubname = strVal(lfirst(lc2));

            if (strcmp(name, pubname) == 0)
            {
                found = true;
                if (addpub)
                    ereport(ERROR,
                            (errcode(ERRCODE_DUPLICATE_OBJECT),
                             errmsg("publication \"%s\" is already in subscription \"%s\"",
                                    name, subname)));
                else
                    oldpublist = foreach_delete_current(oldpublist, lc2);

                break;
            }
        }

        if (addpub && !found)
            oldpublist = lappend(oldpublist, makeString(name));
        else if (!addpub && !found)
            ereport(ERROR,
                    (errcode(ERRCODE_SYNTAX_ERROR),
                     errmsg("publication \"%s\" is not in subscription \"%s\"",
                            name, subname)));
    }

    /*
     * XXX Probably no strong reason for this, but for now it's to make ALTER
     * SUBSCRIPTION ... DROP PUBLICATION consistent with SET PUBLICATION.
     */
    if (!oldpublist)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                 errmsg("subscription must contain at least one publication")));

    return oldpublist;
}

parse_subscription_options()

static void parse_subscription_options ( List *  options, bool *  connect, bool *  enabled_given, bool *  enabled, bool *  create_slot, bool *  slot_name_given, char **  slot_name, bool *  copy_data, char **  synchronous_commit, bool *  refresh, bool *  binary_given, bool *  binary, bool *  streaming_given, bool *  streaming  )

static

Definition at line 63 of file subscriptioncmds.c.

References Assert, connect, defGetBoolean(), defGetString(), DefElem::defname, ereport, errcode(), errmsg(), ERROR, GUC_ACTION_SET, lfirst, PGC_BACKEND, PGC_S_TEST, and set_config_option().

Referenced by AlterSubscription(), and CreateSubscription().

{
    ListCell   *lc;
    bool        connect_given = false;
    bool        create_slot_given = false;
    bool        copy_data_given = false;
    bool        refresh_given = false;

    /* If connect is specified, the others also need to be. */
    Assert(!connect || (enabled && create_slot && copy_data));

    if (connect)
        *connect = true;
    if (enabled)
    {
        *enabled_given = false;
        *enabled = true;
    }
    if (create_slot)
        *create_slot = true;
    if (slot_name)
    {
        *slot_name_given = false;
        *slot_name = NULL;
    }
    if (copy_data)
        *copy_data = true;
    if (synchronous_commit)
        *synchronous_commit = NULL;
    if (refresh)
        *refresh = true;
    if (binary)
    {
        *binary_given = false;
        *binary = false;
    }
    if (streaming)
    {
        *streaming_given = false;
        *streaming = false;
    }

    /* Parse options */
    foreach(lc, options)
    {
        DefElem    *defel = (DefElem *) lfirst(lc);

        if (strcmp(defel->defname, "connect") == 0 && connect)
        {
            if (connect_given)
                ereport(ERROR,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("conflicting or redundant options")));

            connect_given = true;
            *connect = defGetBoolean(defel);
        }
        else if (strcmp(defel->defname, "enabled") == 0 && enabled)
        {
            if (*enabled_given)
                ereport(ERROR,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("conflicting or redundant options")));

            *enabled_given = true;
            *enabled = defGetBoolean(defel);
        }
        else if (strcmp(defel->defname, "create_slot") == 0 && create_slot)
        {
            if (create_slot_given)
                ereport(ERROR,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("conflicting or redundant options")));

            create_slot_given = true;
            *create_slot = defGetBoolean(defel);
        }
        else if (strcmp(defel->defname, "slot_name") == 0 && slot_name)
        {
            if (*slot_name_given)
                ereport(ERROR,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("conflicting or redundant options")));

            *slot_name_given = true;
            *slot_name = defGetString(defel);

            /* Setting slot_name = NONE is treated as no slot name. */
            if (strcmp(*slot_name, "none") == 0)
                *slot_name = NULL;
        }
        else if (strcmp(defel->defname, "copy_data") == 0 && copy_data)
        {
            if (copy_data_given)
                ereport(ERROR,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("conflicting or redundant options")));

            copy_data_given = true;
            *copy_data = defGetBoolean(defel);
        }
        else if (strcmp(defel->defname, "synchronous_commit") == 0 &&
                 synchronous_commit)
        {
            if (*synchronous_commit)
                ereport(ERROR,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("conflicting or redundant options")));

            *synchronous_commit = defGetString(defel);

            /* Test if the given value is valid for synchronous_commit GUC. */
            (void) set_config_option("synchronous_commit", *synchronous_commit,
                                     PGC_BACKEND, PGC_S_TEST, GUC_ACTION_SET,
                                     false, 0, false);
        }
        else if (strcmp(defel->defname, "refresh") == 0 && refresh)
        {
            if (refresh_given)
                ereport(ERROR,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("conflicting or redundant options")));

            refresh_given = true;
            *refresh = defGetBoolean(defel);
        }
        else if (strcmp(defel->defname, "binary") == 0 && binary)
        {
            if (*binary_given)
                ereport(ERROR,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("conflicting or redundant options")));

            *binary_given = true;
            *binary = defGetBoolean(defel);
        }
        else if (strcmp(defel->defname, "streaming") == 0 && streaming)
        {
            if (*streaming_given)
                ereport(ERROR,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("conflicting or redundant options")));

            *streaming_given = true;
            *streaming = defGetBoolean(defel);
        }
        else
            ereport(ERROR,
                    (errcode(ERRCODE_SYNTAX_ERROR),
                     errmsg("unrecognized subscription parameter: \"%s\"", defel->defname)));
    }

    /*
     * We've been explicitly asked to not connect, that requires some
     * additional processing.
     */
    if (connect && !*connect)
    {
        /* Check for incompatible options from the user. */
        if (enabled && *enabled_given && *enabled)
            ereport(ERROR,
                    (errcode(ERRCODE_SYNTAX_ERROR),
            /*- translator: both %s are strings of the form "option = value" */
                     errmsg("%s and %s are mutually exclusive options",
                            "connect = false", "enabled = true")));

        if (create_slot && create_slot_given && *create_slot)
            ereport(ERROR,
                    (errcode(ERRCODE_SYNTAX_ERROR),
                     errmsg("%s and %s are mutually exclusive options",
                            "connect = false", "create_slot = true")));

        if (copy_data && copy_data_given && *copy_data)
            ereport(ERROR,
                    (errcode(ERRCODE_SYNTAX_ERROR),
                     errmsg("%s and %s are mutually exclusive options",
                            "connect = false", "copy_data = true")));

        /* Change the defaults of other options. */
        *enabled = false;
        *create_slot = false;
        *copy_data = false;
    }

    /*
     * Do additional checking for disallowed combination when slot_name = NONE
     * was used.
     */
    if (slot_name && *slot_name_given && !*slot_name)
    {
        if (enabled && *enabled_given && *enabled)
            ereport(ERROR,
                    (errcode(ERRCODE_SYNTAX_ERROR),
            /*- translator: both %s are strings of the form "option = value" */
                     errmsg("%s and %s are mutually exclusive options",
                            "slot_name = NONE", "enabled = true")));

        if (create_slot && create_slot_given && *create_slot)
            ereport(ERROR,
                    (errcode(ERRCODE_SYNTAX_ERROR),
                     errmsg("%s and %s are mutually exclusive options",
                            "slot_name = NONE", "create_slot = true")));

        if (enabled && !*enabled_given && *enabled)
            ereport(ERROR,
                    (errcode(ERRCODE_SYNTAX_ERROR),
            /*- translator: both %s are strings of the form "option = value" */
                     errmsg("subscription with %s must also set %s",
                            "slot_name = NONE", "enabled = false")));

        if (create_slot && !create_slot_given && *create_slot)
            ereport(ERROR,
                    (errcode(ERRCODE_SYNTAX_ERROR),
                     errmsg("subscription with %s must also set %s",
                            "slot_name = NONE", "create_slot = false")));
    }
}

publicationListToArray()

static Datum publicationListToArray ( List *  publist )

static

Definition at line 294 of file subscriptioncmds.c.

References ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, check_duplicates_in_publist(), construct_array(), CurrentMemoryContext, list_length(), MemoryContextDelete(), MemoryContextSwitchTo(), palloc(), and PointerGetDatum.

Referenced by AlterSubscription(), and CreateSubscription().

{
    ArrayType  *arr;
    Datum      *datums;
    MemoryContext memcxt;
    MemoryContext oldcxt;

    /* Create memory context for temporary allocations. */
    memcxt = AllocSetContextCreate(CurrentMemoryContext,
                                   "publicationListToArray to array",
                                   ALLOCSET_DEFAULT_SIZES);
    oldcxt = MemoryContextSwitchTo(memcxt);

    datums = (Datum *) palloc(sizeof(Datum) * list_length(publist));

    check_duplicates_in_publist(publist, datums);

    MemoryContextSwitchTo(oldcxt);

    arr = construct_array(datums, list_length(publist),
                          TEXTOID, -1, false, TYPALIGN_INT);

    MemoryContextDelete(memcxt);

    return PointerGetDatum(arr);
}

ReplicationSlotDropAtPubNode()

void ReplicationSlotDropAtPubNode	(	WalReceiverConn *	wrconn,
		char *	slotname,
		bool	missing_ok
	)

Definition at line 1320 of file subscriptioncmds.c.

References appendStringInfo(), Assert, StringInfoData::data, ereport, WalRcvExecResult::err, errmsg(), ERROR, initStringInfo(), load_file(), LOG, NOTICE, pfree(), PG_END_TRY, PG_FINALLY, PG_TRY, quote_identifier(), WalRcvExecResult::sqlstate, WalRcvExecResult::status, walrcv_clear_result(), WALRCV_ERROR, walrcv_exec, and WALRCV_OK_COMMAND.

Referenced by AlterSubscription_refresh(), DropSubscription(), LogicalRepSyncTableStart(), and process_syncing_tables_for_sync().

{
    StringInfoData cmd;

    Assert(wrconn);

    load_file("libpqwalreceiver", false);

    initStringInfo(&cmd);
    appendStringInfo(&cmd, "DROP_REPLICATION_SLOT %s WAIT", quote_identifier(slotname));

    PG_TRY();
    {
        WalRcvExecResult *res;

        res = walrcv_exec(wrconn, cmd.data, 0, NULL);

        if (res->status == WALRCV_OK_COMMAND)
        {
            /* NOTICE. Success. */
            ereport(NOTICE,
                    (errmsg("dropped replication slot \"%s\" on publisher",
                            slotname)));
        }
        else if (res->status == WALRCV_ERROR &&
                 missing_ok &&
                 res->sqlstate == ERRCODE_UNDEFINED_OBJECT)
        {
            /* LOG. Error, but missing_ok = true. */
            ereport(LOG,
                    (errmsg("could not drop replication slot \"%s\" on publisher: %s",
                            slotname, res->err)));
        }
        else
        {
            /* ERROR. */
            ereport(ERROR,
                    (errmsg("could not drop replication slot \"%s\" on publisher: %s",
                            slotname, res->err)));
        }

        walrcv_clear_result(res);
    }
    PG_FINALLY();
    {
        pfree(cmd.data);
    }
    PG_END_TRY();
}

ReportSlotConnectionError()

static void ReportSlotConnectionError ( List *  rstates, Oid  subid, char *  slotname, char *  err  )

static

Definition at line 1543 of file subscriptioncmds.c.

References elog, ereport, errhint(), errmsg(), ERROR, lfirst, NAMEDATALEN, OidIsValid, SubscriptionRelState::relid, ReplicationSlotNameForTablesync(), SubscriptionRelState::state, and WARNING.

Referenced by DropSubscription().

{
    ListCell   *lc;

    foreach(lc, rstates)
    {
        SubscriptionRelState *rstate = (SubscriptionRelState *) lfirst(lc);
        Oid         relid = rstate->relid;

        /* Only cleanup resources of tablesync workers */
        if (!OidIsValid(relid))
            continue;

        /*
         * Caller needs to ensure that relstate doesn't change underneath us.
         * See DropSubscription where we get the relstates.
         */
        if (rstate->state != SUBREL_STATE_SYNCDONE)
        {
            char        syncslotname[NAMEDATALEN] = {0};

            ReplicationSlotNameForTablesync(subid, relid, syncslotname,
                                            sizeof(syncslotname));
            elog(WARNING, "could not drop tablesync replication slot \"%s\"",
                 syncslotname);
        }
    }

    ereport(ERROR,
            (errmsg("could not connect to publisher when attempting to "
                    "drop replication slot \"%s\": %s", slotname, err),
    /* translator: %s is an SQL ALTER command */
             errhint("Use %s to disassociate the subscription from the slot.",
                     "ALTER SUBSCRIPTION ... SET (slot_name = NONE)")));
}