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spock_node.c
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/*-------------------------------------------------------------------------
*
* spock_node.c
* spock node and subscription catalog manipulation functions
*
* Copyright (c) 2022-2024, pgEdge, Inc.
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, The Regents of the University of California
*
* TODO: caching
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/genam.h"
#include "access/hash.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/xact.h"
#include "catalog/indexing.h"
#include "catalog/objectaddress.h"
#include "catalog/pg_type.h"
#include "commands/dbcommands.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
#include "utils/pg_lsn.h"
#include "utils/rel.h"
#include "spock_node.h"
#include "spock_repset.h"
#include "spock_worker.h"
#include "spock.h"
#define CATALOG_NODE "node"
#define CATALOG_LOCAL_NODE "local_node"
#define CATALOG_NODE_INTERFACE "node_interface"
#define CATALOG_SUBSCRIPTION "subscription"
typedef struct NodeTuple
{
Oid node_id;
NameData node_name;
} NodeTuple;
#define Natts_node 5
#define Anum_node_id 1
#define Anum_node_name 2
#define Anum_node_location 3
#define Anum_node_country 4
#define Anum_node_info 5
#define Natts_local_node 2
#define Anum_node_local_id 1
#define Anum_node_local_node_if 2
typedef struct NodeInterfaceTuple
{
Oid if_id;
NameData if_name;
Oid if_nodeid;
text if_dsn;
} NodeInterfaceTuple;
#define Natts_node_inteface 4
#define Anum_if_id 1
#define Anum_if_name 2
#define Anum_if_nodeid 3
#define Anum_if_dsn 4
typedef struct SubscriptionTuple
{
Oid sub_id;
NameData sub_name;
Oid sub_origin;
Oid sub_target;
Oid sub_origin_if;
Oid sub_target_if;
bool sub_enabled;
NameData sub_slot_name;
} SubscriptionTuple;
#define Natts_subscription 13
#define Anum_sub_id 1
#define Anum_sub_name 2
#define Anum_sub_origin 3
#define Anum_sub_target 4
#define Anum_sub_origin_if 5
#define Anum_sub_target_if 6
#define Anum_sub_enabled 7
#define Anum_sub_slot_name 8
#define Anum_sub_replication_sets 9
#define Anum_sub_forward_origins 10
#define Anum_sub_apply_delay 11
#define Anum_sub_force_text_transfer 12
#define Anum_sub_skip_lsn 13
/*
* We impose same validation rules as replication slot name validation does.
*/
static void
validate_subscription_name(const char *name)
{
const char *cp;
if (strlen(name) == 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("subscription name \"%s\" is too short", name)));
if (strlen(name) >= NAMEDATALEN)
ereport(ERROR,
(errcode(ERRCODE_NAME_TOO_LONG),
errmsg("subscription name \"%s\" is too long", name)));
for (cp = name; *cp; cp++)
{
if (!((*cp >= 'a' && *cp <= 'z')
|| (*cp >= '0' && *cp <= '9')
|| (*cp == '_')))
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("subscription name \"%s\" contains invalid character",
name),
errhint("Subscription names may only contain lower case "
"letters, numbers, and the underscore character.")));
}
}
}
/*
* Add new node to catalog.
*/
void
create_node(SpockNode *node)
{
RangeVar *rv;
Relation rel;
TupleDesc tupDesc;
HeapTuple tup;
Datum values[Natts_node];
bool nulls[Natts_node];
NameData node_name;
if (get_node_by_name(node->name, true) != NULL)
elog(ERROR, "node %s already exists", node->name);
/* Generate new id unless one was already specified. */
if (node->id == InvalidOid)
node->id =
DatumGetUInt32(hash_any((const unsigned char *) node->name,
strlen(node->name))) & 0xffff;
rv = makeRangeVar(EXTENSION_NAME, CATALOG_NODE, -1);
rel = table_openrv(rv, RowExclusiveLock);
tupDesc = RelationGetDescr(rel);
/* Form a tuple. */
memset(nulls, false, sizeof(nulls));
values[Anum_node_id - 1] = ObjectIdGetDatum(node->id);
namestrcpy(&node_name, node->name);
values[Anum_node_name - 1] = NameGetDatum(&node_name);
if (node->location != NULL)
values[Anum_node_location - 1] = CStringGetTextDatum(node->location);
else
nulls[Anum_node_location - 1] = true;
if (node->country != NULL)
values[Anum_node_country - 1] = CStringGetTextDatum(node->country);
else
nulls[Anum_node_country - 1] = true;
if (node->info != NULL)
values[Anum_node_info - 1] = JsonbPGetDatum(node->info);
else
nulls[Anum_node_info - 1] = true;
tup = heap_form_tuple(tupDesc, values, nulls);
/* Insert the tuple to the catalog. */
CatalogTupleInsert(rel, tup);
/* Cleanup. */
heap_freetuple(tup);
table_close(rel, NoLock);
CommandCounterIncrement();
spock_subscription_changed(InvalidOid, false);
}
/*
* Delete node from the catalog.
*/
void
drop_node(Oid nodeid)
{
RangeVar *rv;
Relation rel;
SysScanDesc scan;
HeapTuple tuple;
ScanKeyData key[1];
rv = makeRangeVar(EXTENSION_NAME, CATALOG_NODE, -1);
rel = table_openrv(rv, RowExclusiveLock);
/* Search for node record. */
ScanKeyInit(&key[0],
Anum_node_id,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(nodeid));
scan = systable_beginscan(rel, 0, true, NULL, 1, key);
tuple = systable_getnext(scan);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "node %u not found", nodeid);
/* Remove the tuple. */
simple_heap_delete(rel, &tuple->t_self);
/* Cleanup. */
systable_endscan(scan);
table_close(rel, NoLock);
CommandCounterIncrement();
spock_subscription_changed(InvalidOid, false);
}
static SpockNode *
node_fromtuple(HeapTuple tuple, TupleDesc desc)
{
NodeTuple *nodetup = (NodeTuple *) GETSTRUCT(tuple);
Datum datum;
bool isnull;
SpockNode *node
= (SpockNode *) palloc0(sizeof(SpockNode));
node->id = nodetup->node_id;
node->name = pstrdup(NameStr(nodetup->node_name));
datum = heap_getattr(tuple, Anum_node_location, desc, &isnull);
if (!isnull)
node->location = TextDatumGetCString(datum);
datum = heap_getattr(tuple, Anum_node_country, desc, &isnull);
if (!isnull)
node->country = TextDatumGetCString(datum);
datum = heap_getattr(tuple, Anum_node_info, desc, &isnull);
if (!isnull)
{
Datum value;
int32 intval;
node->info = DatumGetJsonbP(datum);
/*
* The node entry has jsonb info, try to extract the
* tiebreaker value from that. If it isn't set we
* fallback to the node-id.
*/
value = DirectFunctionCall2(jsonb_object_field_text, datum,
CStringGetTextDatum("tiebreaker"));
if (DatumGetPointer(value) != NULL)
{
intval = pg_strtoint32(TextDatumGetCString(value));
node->tiebreaker = intval;
}
else
node->tiebreaker = node->id;
}
else
{
node->tiebreaker = node->id;
}
return node;
}
/*
* Load the info for specific node.
*/
SpockNode *
get_node(Oid nodeid)
{
SpockNode *node;
RangeVar *rv;
Relation rel;
SysScanDesc scan;
HeapTuple tuple;
ScanKeyData key[1];
rv = makeRangeVar(EXTENSION_NAME, CATALOG_NODE, -1);
rel = table_openrv(rv, RowExclusiveLock);
/* Search for node record. */
ScanKeyInit(&key[0],
Anum_node_id,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(nodeid));
scan = systable_beginscan(rel, 0, true, NULL, 1, key);
tuple = systable_getnext(scan);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "node %u not found", nodeid);
node = node_fromtuple(tuple, RelationGetDescr(rel));
systable_endscan(scan);
table_close(rel, RowExclusiveLock);
return node;
}
/*
* Load the info for specific node.
*/
SpockNode *
get_node_by_name(const char *name, bool missing_ok)
{
SpockNode *node;
RangeVar *rv;
Relation rel;
SysScanDesc scan;
HeapTuple tuple;
ScanKeyData key[1];
rv = makeRangeVar(EXTENSION_NAME, CATALOG_NODE, -1);
rel = table_openrv(rv, RowExclusiveLock);
/* Search for node record. */
ScanKeyInit(&key[0],
Anum_node_name,
BTEqualStrategyNumber, F_NAMEEQ,
CStringGetDatum(name));
scan = systable_beginscan(rel, 0, true, NULL, 1, key);
tuple = systable_getnext(scan);
if (!HeapTupleIsValid(tuple))
{
if (missing_ok)
{
systable_endscan(scan);
table_close(rel, RowExclusiveLock);
return NULL;
}
elog(ERROR, "node %s not found", name);
}
node = node_fromtuple(tuple, RelationGetDescr(rel));
systable_endscan(scan);
table_close(rel, RowExclusiveLock);
return node;
}
/*
* Add local node record to catalog.
*/
void
create_local_node(Oid nodeid, Oid ifid)
{
RangeVar *rv;
Relation rel;
TupleDesc tupDesc;
HeapTuple tup;
Datum values[Natts_local_node];
bool nulls[Natts_local_node];
rv = makeRangeVar(EXTENSION_NAME, CATALOG_LOCAL_NODE, -1);
rel = table_openrv(rv, AccessExclusiveLock);
tupDesc = RelationGetDescr(rel);
/* TODO: better error message */
if (get_local_node(false, true))
elog(ERROR, "current database is already configured as spock node");
/* Form a tuple. */
memset(nulls, false, sizeof(nulls));
values[Anum_node_local_id - 1] = ObjectIdGetDatum(nodeid);
values[Anum_node_local_node_if - 1] = ObjectIdGetDatum(ifid);
tup = heap_form_tuple(tupDesc, values, nulls);
/* Insert the tuple to the catalog. */
CatalogTupleInsert(rel, tup);
/* Cleanup. */
heap_freetuple(tup);
table_close(rel, AccessExclusiveLock);
CommandCounterIncrement();
}
/*
* Drop local node record from catalog.
*/
void
drop_local_node(void)
{
RangeVar *rv;
Relation rel;
SysScanDesc scan;
HeapTuple tuple;
rv = makeRangeVar(EXTENSION_NAME, CATALOG_LOCAL_NODE, -1);
rel = table_openrv(rv, AccessExclusiveLock);
/* Find the local node tuple. */
scan = systable_beginscan(rel, 0, true, NULL, 0, NULL);
tuple = systable_getnext(scan);
/* No local node record found. */
if (!HeapTupleIsValid(tuple))
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("local node not found")));
/* Remove the tuple. */
simple_heap_delete(rel, &tuple->t_self);
/* Cleanup. */
systable_endscan(scan);
table_close(rel, NoLock);
CommandCounterIncrement();
}
/*
* Return local node.
*/
SpockLocalNode *
get_local_node(bool for_update, bool missing_ok)
{
RangeVar *rv;
Relation rel;
SysScanDesc scan;
HeapTuple tuple;
TupleDesc desc;
Oid nodeid;
Oid nodeifid;
bool isnull;
SpockLocalNode *res;
rv = makeRangeVar(EXTENSION_NAME, CATALOG_LOCAL_NODE, -1);
rel = table_openrv_extended(rv, for_update ?
ShareUpdateExclusiveLock : RowExclusiveLock,
true);
if (!rel)
{
if (missing_ok)
return NULL;
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("local spock node not found")));
}
/* Find the local node tuple. */
scan = systable_beginscan(rel, 0, true, NULL, 0, NULL);
tuple = systable_getnext(scan);
/* No local node record found. */
if (!HeapTupleIsValid(tuple))
{
if (missing_ok)
{
systable_endscan(scan);
table_close(rel, for_update ?
NoLock : RowExclusiveLock);
return NULL;
}
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("local spock node not found")));
}
desc = RelationGetDescr(rel);
nodeid = DatumGetObjectId(fastgetattr(tuple, Anum_node_local_id, desc,
&isnull));
nodeifid = DatumGetObjectId(fastgetattr(tuple, Anum_node_local_node_if,
desc, &isnull));
systable_endscan(scan);
table_close(rel, for_update ? NoLock : RowExclusiveLock);
res = (SpockLocalNode *) palloc(sizeof(SpockLocalNode));
res->node = get_node(nodeid);
res->node_if = get_node_interface(nodeifid);
return res;
}
/*
* Add new node interface to catalog.
*/
void
create_node_interface(SpockInterface *nodeif)
{
RangeVar *rv;
Relation rel;
TupleDesc tupDesc;
HeapTuple tup;
Datum values[Natts_node_inteface];
bool nulls[Natts_node_inteface];
NameData nodeif_name;
/* Generate new id unless one was already specified. */
if (nodeif->id == InvalidOid)
{
uint32 hashinput[2];
hashinput[0] = nodeif->nodeid;
hashinput[1] = DatumGetUInt32(hash_any((const unsigned char *) nodeif->name,
strlen(nodeif->name)));
nodeif->id = DatumGetUInt32(hash_any((const unsigned char *) hashinput,
(int) sizeof(hashinput)));
}
rv = makeRangeVar(EXTENSION_NAME, CATALOG_NODE_INTERFACE, -1);
rel = table_openrv(rv, RowExclusiveLock);
tupDesc = RelationGetDescr(rel);
/* Form a tuple. */
memset(nulls, false, sizeof(nulls));
values[Anum_if_id - 1] = ObjectIdGetDatum(nodeif->id);
namestrcpy(&nodeif_name, nodeif->name);
values[Anum_if_name - 1] = NameGetDatum(&nodeif_name);
values[Anum_if_nodeid - 1] = ObjectIdGetDatum(nodeif->nodeid);
values[Anum_if_dsn - 1] = CStringGetTextDatum(nodeif->dsn);
tup = heap_form_tuple(tupDesc, values, nulls);
/* Insert the tuple to the catalog. */
CatalogTupleInsert(rel, tup);
/* Cleanup. */
heap_freetuple(tup);
table_close(rel, RowExclusiveLock);
CommandCounterIncrement();
}
/*
* Delete node interface from the catalog.
*/
void
drop_node_interface(Oid ifid)
{
RangeVar *rv;
Relation rel;
SysScanDesc scan;
HeapTuple tuple;
ScanKeyData key[1];
rv = makeRangeVar(EXTENSION_NAME, CATALOG_NODE_INTERFACE, -1);
rel = table_openrv(rv, RowExclusiveLock);
/* Search for node record. */
ScanKeyInit(&key[0],
Anum_if_id,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(ifid));
scan = systable_beginscan(rel, 0, true, NULL, 1, key);
tuple = systable_getnext(scan);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "node interface %u not found", ifid);
/* Remove the tuple. */
simple_heap_delete(rel, &tuple->t_self);
/* Cleanup. */
systable_endscan(scan);
table_close(rel, NoLock);
CommandCounterIncrement();
}
/*
* Delete all node interfaces from the catalog.
*/
void
drop_node_interfaces(Oid nodeid)
{
RangeVar *rv;
Relation rel;
SysScanDesc scan;
HeapTuple tuple;
ScanKeyData key[1];
rv = makeRangeVar(EXTENSION_NAME, CATALOG_NODE_INTERFACE, -1);
rel = table_openrv(rv, RowExclusiveLock);
/* Search for node record. */
ScanKeyInit(&key[0],
Anum_if_nodeid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(nodeid));
scan = systable_beginscan(rel, 0, true, NULL, 1, key);
/* Remove tuples. */
while (HeapTupleIsValid(tuple = systable_getnext(scan)))
simple_heap_delete(rel, &tuple->t_self);
/* Cleanup. */
systable_endscan(scan);
table_close(rel, NoLock);
CommandCounterIncrement();
}
/*
* Get the node interface from the catalog.
*/
SpockInterface *
get_node_interface(Oid ifid)
{
RangeVar *rv;
Relation rel;
SysScanDesc scan;
HeapTuple tuple;
ScanKeyData key[1];
NodeInterfaceTuple *iftup;
SpockInterface *nodeif;
rv = makeRangeVar(EXTENSION_NAME, CATALOG_NODE_INTERFACE, -1);
rel = table_openrv(rv, RowExclusiveLock);
/* Search for node record. */
ScanKeyInit(&key[0],
Anum_if_id,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(ifid));
scan = systable_beginscan(rel, 0, true, NULL, 1, key);
tuple = systable_getnext(scan);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "node interface %u not found", ifid);
iftup = (NodeInterfaceTuple *) GETSTRUCT(tuple);
nodeif = (SpockInterface *) palloc(sizeof(SpockInterface));
nodeif->id = iftup->if_id;
nodeif->name = pstrdup(NameStr(iftup->if_name));
nodeif->nodeid = iftup->if_nodeid;
nodeif->dsn = pstrdup(text_to_cstring(&iftup->if_dsn));
/* Cleanup. */
systable_endscan(scan);
table_close(rel, RowExclusiveLock);
return nodeif;
}
/*
* Get the node interface by name.
*/
SpockInterface *
get_node_interface_by_name(Oid nodeid, const char *name, bool missing_ok)
{
RangeVar *rv;
Relation rel;
SysScanDesc scan;
HeapTuple tuple;
ScanKeyData key[2];
NodeInterfaceTuple *iftup;
SpockInterface *nodeif;
rv = makeRangeVar(EXTENSION_NAME, CATALOG_NODE_INTERFACE, -1);
rel = table_openrv(rv, RowExclusiveLock);
/* Search for interface record. */
ScanKeyInit(&key[0],
Anum_if_nodeid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(nodeid));
ScanKeyInit(&key[1],
Anum_if_name,
BTEqualStrategyNumber, F_NAMEEQ,
CStringGetDatum(name));
scan = systable_beginscan(rel, 0, true, NULL, 2, key);
tuple = systable_getnext(scan);
if (!HeapTupleIsValid(tuple))
{
if (missing_ok)
{
systable_endscan(scan);
table_close(rel, RowExclusiveLock);
return NULL;
}
else
elog(ERROR, "node interface \"%s\" not found for nod %u",
name, nodeid);
}
iftup = (NodeInterfaceTuple *) GETSTRUCT(tuple);
nodeif = (SpockInterface *) palloc(sizeof(SpockInterface));
nodeif->id = iftup->if_id;
nodeif->name = pstrdup(NameStr(iftup->if_name));
nodeif->nodeid = iftup->if_nodeid;
nodeif->dsn = pstrdup(text_to_cstring(&iftup->if_dsn));
/* Cleanup. */
systable_endscan(scan);
table_close(rel, RowExclusiveLock);
return nodeif;
}
/*
* Add new subscription to catalog.
*/
void
create_subscription(SpockSubscription *sub)
{
RangeVar *rv;
Relation rel;
TupleDesc tupDesc;
HeapTuple tup;
Datum values[Natts_subscription];
bool nulls[Natts_subscription];
NameData sub_name;
NameData sub_slot_name;
/* Validate the new subscription name. */
validate_subscription_name(sub->name);
if (get_subscription_by_name(sub->name, true) != NULL)
elog(ERROR, "subscription %s already exists", sub->name);
/* Generate new id unless one was already specified. */
if (sub->id == InvalidOid)
sub->id =
DatumGetObjectId(hash_any((const unsigned char *) sub->name,
strlen(sub->name)));
rv = makeRangeVar(EXTENSION_NAME, CATALOG_SUBSCRIPTION, -1);
rel = table_openrv(rv, RowExclusiveLock);
tupDesc = RelationGetDescr(rel);
/* Form a tuple. */
memset(nulls, false, sizeof(nulls));
values[Anum_sub_id - 1] = ObjectIdGetDatum(sub->id);
namestrcpy(&sub_name, sub->name);
values[Anum_sub_name - 1] = NameGetDatum(&sub_name);
values[Anum_sub_origin - 1] = ObjectIdGetDatum(sub->origin_if->nodeid);
values[Anum_sub_target - 1] = ObjectIdGetDatum(sub->target_if->nodeid);
values[Anum_sub_origin_if - 1] = ObjectIdGetDatum(sub->origin_if->id);
values[Anum_sub_target_if - 1] = ObjectIdGetDatum(sub->target_if->id);
values[Anum_sub_enabled - 1] = BoolGetDatum(sub->enabled);
namestrcpy(&sub_slot_name, sub->slot_name);
values[Anum_sub_slot_name - 1] = NameGetDatum(&sub_slot_name);
if (list_length(sub->replication_sets) > 0)
values[Anum_sub_replication_sets - 1] =
PointerGetDatum(strlist_to_textarray(sub->replication_sets));
else
nulls[Anum_sub_replication_sets - 1] = true;
if (list_length(sub->forward_origins) > 0)
values[Anum_sub_forward_origins - 1] =
PointerGetDatum(strlist_to_textarray(sub->forward_origins));
else
nulls[Anum_sub_forward_origins - 1] = true;
if (sub->apply_delay)
values[Anum_sub_apply_delay - 1] = IntervalPGetDatum(sub->apply_delay);
else
nulls[Anum_sub_apply_delay - 1] = true;
values[Anum_sub_force_text_transfer - 1] = BoolGetDatum(sub->force_text_transfer);
values[Anum_sub_skip_lsn - 1] = LSNGetDatum(sub->skiplsn);
tup = heap_form_tuple(tupDesc, values, nulls);
/* Insert the tuple to the catalog. */
CatalogTupleInsert(rel, tup);
/* Cleanup. */
heap_freetuple(tup);
table_close(rel, RowExclusiveLock);
CommandCounterIncrement();
spock_subscription_changed(sub->id, true);
}
/*
* Change the subscription tuple.
*/
void
alter_subscription(SpockSubscription *sub)
{
RangeVar *rv;
Relation rel;
TupleDesc tupDesc;
SysScanDesc scan;
SubscriptionTuple *oldsub;
HeapTuple oldtup,
newtup;
ScanKeyData key[1];
Datum values[Natts_subscription];
bool nulls[Natts_subscription];
bool replaces[Natts_subscription];
NameData sub_slot_name;
rv = makeRangeVar(EXTENSION_NAME, CATALOG_SUBSCRIPTION, -1);
rel = table_openrv(rv, RowExclusiveLock);
tupDesc = RelationGetDescr(rel);
/* Search for node record. */
ScanKeyInit(&key[0],
Anum_sub_id,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(sub->id));
scan = systable_beginscan(rel, 0, true, NULL, 1, key);
oldtup = systable_getnext(scan);
if (!HeapTupleIsValid(oldtup))
elog(ERROR, "subscription %u not found", sub->id);
oldsub = (SubscriptionTuple *) GETSTRUCT(oldtup);
if (strcmp(NameStr(oldsub->sub_name), sub->name) != 0)
ereport(LOG,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("subscription name change is not supported")));
/* Form a tuple. */
memset(nulls, false, sizeof(nulls));
memset(replaces, true, sizeof(replaces));
replaces[Anum_sub_id - 1] = false;
replaces[Anum_sub_name - 1] = false;
values[Anum_sub_origin - 1] = ObjectIdGetDatum(sub->origin_if->nodeid);
values[Anum_sub_target - 1] = ObjectIdGetDatum(sub->target_if->nodeid);
values[Anum_sub_origin_if - 1] = ObjectIdGetDatum(sub->origin_if->id);
values[Anum_sub_target_if - 1] = ObjectIdGetDatum(sub->target_if->id);
values[Anum_sub_enabled - 1] = BoolGetDatum(sub->enabled);
namestrcpy(&sub_slot_name, sub->slot_name);
values[Anum_sub_slot_name - 1] = NameGetDatum(&sub_slot_name);
if (list_length(sub->replication_sets) > 0)
values[Anum_sub_replication_sets - 1] =
PointerGetDatum(strlist_to_textarray(sub->replication_sets));
else
nulls[Anum_sub_replication_sets - 1] = true;
if (list_length(sub->forward_origins) > 0)
values[Anum_sub_forward_origins - 1] =
PointerGetDatum(strlist_to_textarray(sub->forward_origins));
else
nulls[Anum_sub_forward_origins - 1] = true;
values[Anum_sub_apply_delay - 1] = IntervalPGetDatum(sub->apply_delay);
values[Anum_sub_force_text_transfer - 1] = BoolGetDatum(sub->force_text_transfer);
values[Anum_sub_skip_lsn - 1] = LSNGetDatum(sub->skiplsn);
newtup = heap_modify_tuple(oldtup, tupDesc, values, nulls, replaces);
/* Update the tuple in catalog. */
CatalogTupleUpdate(rel, &oldtup->t_self, newtup);
/* Cleanup. */
heap_freetuple(newtup);
systable_endscan(scan);
table_close(rel, NoLock);
CommandCounterIncrement();
spock_subscription_changed(sub->id, true);
}
/*
* Delete the tuple from subsription catalog.
*/
void
drop_subscription(Oid subid)
{
RangeVar *rv;
Relation rel;
SysScanDesc scan;
HeapTuple tuple;
ScanKeyData key[1];
rv = makeRangeVar(EXTENSION_NAME, CATALOG_SUBSCRIPTION, -1);
rel = table_openrv(rv, RowExclusiveLock);
/* Search for node record. */
ScanKeyInit(&key[0],
Anum_sub_id,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(subid));
scan = systable_beginscan(rel, 0, true, NULL, 1, key);
tuple = systable_getnext(scan);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "subscription %u not found", subid);
/* Remove the tuple. */
simple_heap_delete(rel, &tuple->t_self);
/* Cleanup. */
systable_endscan(scan);
table_close(rel, NoLock);
CommandCounterIncrement();
spock_subscription_changed(subid, true);
}
static SpockSubscription*
subscription_fromtuple(HeapTuple tuple, TupleDesc desc)
{
SubscriptionTuple *subtup = (SubscriptionTuple *) GETSTRUCT(tuple);
Datum d;
bool isnull;
SpockSubscription *sub =
(SpockSubscription *) palloc(sizeof(SpockSubscription));
sub->id = subtup->sub_id;
sub->name = pstrdup(NameStr(subtup->sub_name));
sub->enabled = subtup->sub_enabled;
sub->slot_name = pstrdup(NameStr(subtup->sub_slot_name));
sub->origin = get_node(subtup->sub_origin);
sub->target = get_node(subtup->sub_target);
sub->origin_if = get_node_interface(subtup->sub_origin_if);
sub->target_if = get_node_interface(subtup->sub_target_if);
/* Get replication sets. */
d = heap_getattr(tuple, Anum_sub_replication_sets, desc, &isnull);
if (isnull)
sub->replication_sets = NIL;
else
{
List *repset_names;
repset_names = textarray_to_list(DatumGetArrayTypeP(d));
sub->replication_sets = repset_names;
}
/* Get origin forwarding. */
d = heap_getattr(tuple, Anum_sub_forward_origins, desc, &isnull);
if (isnull)
sub->forward_origins = NIL;
else
{
List *forward_origin_names;
forward_origin_names = textarray_to_list(DatumGetArrayTypeP(d));
sub->forward_origins = forward_origin_names;
}
/* Get apply_delay. */
d = heap_getattr(tuple, Anum_sub_apply_delay, desc, &isnull);
if (isnull)
sub->apply_delay = NULL;
else
sub->apply_delay = DatumGetIntervalP(d);
/* Get force_text_transfer. */
d = heap_getattr(tuple, Anum_sub_force_text_transfer, desc, &isnull);
if (isnull)
sub->force_text_transfer = false;
else
sub->force_text_transfer = DatumGetBool(d);
/* Get skip_lsn. */
d = fastgetattr(tuple, Anum_sub_skip_lsn, desc, &isnull);