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spock_functions.c
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spock_functions.c
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/*-------------------------------------------------------------------------
*
* spock_functions.c
* spock SQL visible interfaces
*
* Copyright (c) 2022-2023, pgEdge, Inc.
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, The Regents of the University of California
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/commit_ts.h"
#include "access/genam.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/sysattr.h"
#include "access/xact.h"
#include "access/xlog.h"
#include "catalog/catalog.h"
#include "catalog/heap.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
#include "catalog/pg_authid_d.h"
#include "catalog/pg_inherits.h"
#include "catalog/pg_type.h"
#include "commands/dbcommands.h"
#include "commands/event_trigger.h"
#include "commands/trigger.h"
#include "executor/spi.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "nodes/bitmapset.h"
#include "nodes/makefuncs.h"
#include "pgtime.h"
#include "parser/parse_coerce.h"
#include "parser/parse_collate.h"
#include "parser/parse_expr.h"
#include "parser/parse_relation.h"
#include "replication/origin.h"
#include "replication/reorderbuffer.h"
#include "replication/slot.h"
#include "storage/ipc.h"
#include "storage/latch.h"
#include "storage/proc.h"
#include "tcop/tcopprot.h"
#include "utils/acl.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/catcache.h"
#include "utils/fmgroids.h"
#include "utils/inval.h"
#include "utils/json.h"
#include "utils/guc.h"
#if PG_VERSION_NUM >= 160000
#include "utils/guc_hooks.h"
#endif
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/pg_lsn.h"
#include "utils/rel.h"
#include "utils/snapmgr.h"
#include "pgstat.h"
#include "spock_dependency.h"
#include "spock_node.h"
#include "spock_executor.h"
#include "spock_queue.h"
#include "spock_relcache.h"
#include "spock_repset.h"
#include "spock_rpc.h"
#include "spock_sync.h"
#include "spock_worker.h"
#include "spock_conflict.h"
#include "spock.h"
/* Node management. */
PG_FUNCTION_INFO_V1(spock_create_node);
PG_FUNCTION_INFO_V1(spock_drop_node);
PG_FUNCTION_INFO_V1(spock_alter_node_add_interface);
PG_FUNCTION_INFO_V1(spock_alter_node_drop_interface);
/* Subscription management. */
PG_FUNCTION_INFO_V1(spock_create_subscription);
PG_FUNCTION_INFO_V1(spock_drop_subscription);
PG_FUNCTION_INFO_V1(spock_alter_subscription_interface);
PG_FUNCTION_INFO_V1(spock_alter_subscription_disable);
PG_FUNCTION_INFO_V1(spock_alter_subscription_enable);
PG_FUNCTION_INFO_V1(spock_alter_subscription_add_replication_set);
PG_FUNCTION_INFO_V1(spock_alter_subscription_remove_replication_set);
PG_FUNCTION_INFO_V1(spock_alter_subscription_synchronize);
PG_FUNCTION_INFO_V1(spock_alter_subscription_resynchronize_table);
PG_FUNCTION_INFO_V1(spock_show_subscription_table);
PG_FUNCTION_INFO_V1(spock_show_subscription_status);
PG_FUNCTION_INFO_V1(spock_wait_for_subscription_sync_complete);
PG_FUNCTION_INFO_V1(spock_wait_for_table_sync_complete);
/* Replication set manipulation. */
PG_FUNCTION_INFO_V1(spock_create_replication_set);
PG_FUNCTION_INFO_V1(spock_alter_replication_set);
PG_FUNCTION_INFO_V1(spock_drop_replication_set);
PG_FUNCTION_INFO_V1(spock_replication_set_add_table);
PG_FUNCTION_INFO_V1(spock_replication_set_add_all_tables);
PG_FUNCTION_INFO_V1(spock_replication_set_remove_table);
PG_FUNCTION_INFO_V1(spock_replication_set_add_sequence);
PG_FUNCTION_INFO_V1(spock_replication_set_add_all_sequences);
PG_FUNCTION_INFO_V1(spock_replication_set_remove_sequence);
PG_FUNCTION_INFO_V1(spock_replication_set_add_partition);
PG_FUNCTION_INFO_V1(spock_replication_set_remove_partition);
/* Other manipulation function */
PG_FUNCTION_INFO_V1(spock_synchronize_sequence);
/* DDL */
PG_FUNCTION_INFO_V1(spock_replicate_ddl_command);
PG_FUNCTION_INFO_V1(spock_queue_truncate);
PG_FUNCTION_INFO_V1(spock_truncate_trigger_add);
PG_FUNCTION_INFO_V1(spock_dependency_check_trigger);
/* Internal utils */
PG_FUNCTION_INFO_V1(spock_gen_slot_name);
PG_FUNCTION_INFO_V1(spock_node_info);
PG_FUNCTION_INFO_V1(spock_show_repset_table_info);
PG_FUNCTION_INFO_V1(spock_table_data_filtered);
/* Information */
PG_FUNCTION_INFO_V1(spock_version);
PG_FUNCTION_INFO_V1(spock_version_num);
PG_FUNCTION_INFO_V1(spock_min_proto_version);
PG_FUNCTION_INFO_V1(spock_max_proto_version);
PG_FUNCTION_INFO_V1(spock_xact_commit_timestamp_origin);
/* Compatibility for upgrading */
PG_FUNCTION_INFO_V1(spock_show_repset_table_info_by_target);
/* Stats/Counters */
PG_FUNCTION_INFO_V1(get_channel_stats);
PG_FUNCTION_INFO_V1(reset_channel_stats);
PG_FUNCTION_INFO_V1(prune_conflict_tracking);
PG_FUNCTION_INFO_V1(lag_tracker_info);
PG_FUNCTION_INFO_V1(lag_tracker_feedback);
static void gen_slot_name(Name slot_name, char *dbname,
const char *provider_name,
const char *subscriber_name);
bool in_spock_replicate_ddl_command = false;
bool in_spock_queue_ddl_command = false;
static SpockLocalNode *
check_local_node(bool for_update)
{
SpockLocalNode *node;
node = get_local_node(for_update, true);
if (!node)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("current database is not configured as spock node"),
errhint("create spock node first")));
return node;
}
/*
* Create new node
*/
Datum
spock_create_node(PG_FUNCTION_ARGS)
{
char *node_name;
char *node_dsn;
char *location = NULL;
char *country = NULL;
Jsonb *info = NULL;
SpockNode node;
SpockInterface nodeif;
SpockRepSet repset;
/* node name or dsn cannot be NULL */
if (PG_ARGISNULL(0) || PG_ARGISNULL(1))
PG_RETURN_NULL();
node_name = NameStr(*PG_GETARG_NAME(0));
node_dsn = text_to_cstring(PG_GETARG_TEXT_PP(1));
if (!PG_ARGISNULL(2))
location = text_to_cstring(PG_GETARG_TEXT_PP(2));
if (!PG_ARGISNULL(3))
country = text_to_cstring(PG_GETARG_TEXT_PP(3));
if (!PG_ARGISNULL(4))
info = PG_GETARG_JSONB_P(4);
node.id = InvalidOid;
node.name = node_name;
node.location = location;
node.country = country;
node.info = info;
create_node(&node);
nodeif.id = InvalidOid;
nodeif.name = node.name;
nodeif.nodeid = node.id;
nodeif.dsn = node_dsn;
create_node_interface(&nodeif);
/* Create predefined repsets. */
repset.id = InvalidOid;
repset.nodeid = node.id;
repset.name = DEFAULT_REPSET_NAME;
repset.replicate_insert = true;
repset.replicate_update = true;
repset.replicate_delete = true;
repset.replicate_truncate = true;
create_replication_set(&repset);
repset.id = InvalidOid;
repset.nodeid = node.id;
repset.name = DEFAULT_INSONLY_REPSET_NAME;
repset.replicate_insert = true;
repset.replicate_update = false;
repset.replicate_delete = false;
repset.replicate_truncate = true;
create_replication_set(&repset);
repset.id = InvalidOid;
repset.nodeid = node.id;
repset.name = DDL_SQL_REPSET_NAME;
repset.replicate_insert = true;
repset.replicate_update = false;
repset.replicate_delete = false;
repset.replicate_truncate = false;
create_replication_set(&repset);
create_local_node(node.id, nodeif.id);
PG_RETURN_OID(node.id);
}
/*
* Drop the named node.
*
* TODO: support cascade (drop subscribers)
*/
Datum
spock_drop_node(PG_FUNCTION_ARGS)
{
char *node_name = NameStr(*PG_GETARG_NAME(0));
bool ifexists = PG_GETARG_BOOL(1);
SpockNode *node;
node = get_node_by_name(node_name, ifexists);
if (node != NULL)
{
SpockLocalNode *local_node;
List *osubs;
List *tsubs;
osubs = get_node_subscriptions(node->id, true);
tsubs = get_node_subscriptions(node->id, false);
if (list_length(osubs) != 0 || list_length(tsubs) != 0)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("cannot drop node \"%s\" because it still has subscriptions associated with it", node_name),
errhint("drop the subscriptions first")));
/* If the node is local node, drop the record as well. */
local_node = get_local_node(true, true);
if (local_node && local_node->node->id == node->id)
{
int res;
/*
* Also drop all the slots associated with the node.
*
* We do this via SPI mainly because ReplicationSlotCtl is not
* accessible on Windows.
*/
SPI_connect();
PG_TRY();
{
res = SPI_execute("SELECT pg_catalog.pg_drop_replication_slot(slot_name)"
" FROM pg_catalog.pg_replication_slots"
" WHERE (plugin = 'spock_output' OR plugin = 'spock')"
" AND database = current_database()"
" AND slot_name ~ 'spk_.*'",
false, 0);
}
PG_CATCH();
{
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("cannot drop node \"%s\" because one or more replication slots for the node are still active",
node_name),
errhint("drop the subscriptions connected to the node first")));
}
PG_END_TRY();
if (res != SPI_OK_SELECT)
elog(ERROR, "SPI query failed: %d", res);
SPI_finish();
/* And drop the local node association as well. */
drop_local_node();
}
/* Drop all the interfaces. */
drop_node_interfaces(node->id);
/* Drop replication sets associated with the node. */
drop_node_replication_sets(node->id);
/* Drop the node itself. */
drop_node(node->id);
}
PG_RETURN_BOOL(node != NULL);
}
/*
* Add interface to a node.
*/
Datum
spock_alter_node_add_interface(PG_FUNCTION_ARGS)
{
char *node_name = NameStr(*PG_GETARG_NAME(0));
char *if_name = NameStr(*PG_GETARG_NAME(1));
char *if_dsn = text_to_cstring(PG_GETARG_TEXT_PP(2));
SpockNode *node;
SpockInterface *oldif,
newif;
node = get_node_by_name(node_name, false);
if (node == NULL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("node \"%s\" not found", node_name)));
oldif = get_node_interface_by_name(node->id, if_name, true);
if (oldif != NULL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("node \"%s\" already has interface named \"%s\"",
node_name, if_name)));
newif.id = InvalidOid;
newif.name = if_name;
newif.nodeid = node->id;
newif.dsn = if_dsn;
create_node_interface(&newif);
PG_RETURN_OID(newif.id);
}
/*
* Drop interface from a node.
*/
Datum
spock_alter_node_drop_interface(PG_FUNCTION_ARGS)
{
char *node_name = NameStr(*PG_GETARG_NAME(0));
char *if_name = NameStr(*PG_GETARG_NAME(1));
SpockNode *node;
SpockInterface *oldif;
List *other_subs;
ListCell *lc;
node = get_node_by_name(node_name, false);
if (node == NULL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("node \"%s\" not found", node_name)));
oldif = get_node_interface_by_name(node->id, if_name, true);
if (oldif == NULL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("interface \"%s\" for node node \"%s\" not found",
if_name, node_name)));
other_subs = get_node_subscriptions(node->id, true);
foreach (lc, other_subs)
{
SpockSubscription *sub = (SpockSubscription *) lfirst(lc);
if (oldif->id == sub->origin_if->id)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("cannot drop interface \"%s\" for node \"%s\" because subscription \"%s\" is using it",
oldif->name, node->name, sub->name),
errhint("change the subscription interface first")));
}
drop_node_interface(oldif->id);
PG_RETURN_BOOL(true);
}
/*
* Connect two existing nodes.
*/
Datum
spock_create_subscription(PG_FUNCTION_ARGS)
{
char *sub_name = NameStr(*PG_GETARG_NAME(0));
char *provider_dsn = text_to_cstring(PG_GETARG_TEXT_PP(1));
ArrayType *rep_set_names = PG_GETARG_ARRAYTYPE_P(2);
bool sync_structure = PG_GETARG_BOOL(3);
bool sync_data = PG_GETARG_BOOL(4);
ArrayType *forward_origin_names = PG_GETARG_ARRAYTYPE_P(5);
Interval *apply_delay = PG_GETARG_INTERVAL_P(6);
bool force_text_transfer = PG_GETARG_BOOL(7);
PGconn *conn;
SpockSubscription sub;
SpockSyncStatus sync;
SpockNode *origin;
SpockNode *existing_origin;
SpockInterface originif;
SpockLocalNode *localnode;
SpockInterface targetif;
List *replication_sets;
List *other_subs;
ListCell *lc;
NameData slot_name;
/* Check that this is actually a node. */
localnode = get_local_node(true, false);
/* Now, fetch info about remote node. */
conn = spock_connect(provider_dsn, sub_name, "create");
origin = spock_remote_node_info(conn, NULL, NULL, NULL);
PQfinish(conn);
/* Check that we can connect remotely also in replication mode. */
conn = spock_connect_replica(provider_dsn, sub_name, "create");
PQfinish(conn);
/* Check that local connection works. */
conn = spock_connect(localnode->node_if->dsn, sub_name, "create");
PQfinish(conn);
/*
* Check for existing local representation of remote node and interface
* and lock it if it already exists.
*/
existing_origin = get_node_by_name(origin->name, true);
/*
* If not found, crate local representation of remote node and interface.
*/
if (!existing_origin)
{
create_node(origin);
originif.id = InvalidOid;
originif.name = origin->name;
originif.nodeid = origin->id;
originif.dsn = provider_dsn;
create_node_interface(&originif);
}
else
{
SpockInterface *existingif;
existingif = get_node_interface_by_name(origin->id, origin->name, false);
if (strcmp(existingif->dsn, provider_dsn) != 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("dsn \"%s\" points to existing node \"%s\" with different dsn \"%s\"",
provider_dsn, origin->name, existingif->dsn)));
memcpy(&originif, existingif, sizeof(SpockInterface));
}
/*
* Check for overlapping replication sets.
*
* Note that we can't use exclusion constraints as we use the
* subscriptions table in same manner as system catalog.
*/
replication_sets = textarray_to_list(rep_set_names);
other_subs = get_node_subscriptions(originif.nodeid, true);
foreach (lc, other_subs)
{
SpockSubscription *esub = (SpockSubscription *) lfirst(lc);
ListCell *esetcell;
foreach (esetcell, esub->replication_sets)
{
char *existingset = lfirst(esetcell);
ListCell *nsetcell;
foreach (nsetcell, replication_sets)
{
char *newset = lfirst(nsetcell);
if (strcmp(newset, existingset) == 0)
ereport(WARNING,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("existing subscription \"%s\" to node "
"\"%s\" already subscribes to replication "
"set \"%s\"", esub->name, origin->name,
newset)));
}
}
}
/*
* Create the subscription.
*
* Note for now we don't care much about the target interface so we fake
* it here to be invalid.
*/
targetif.id = localnode->node_if->id;
targetif.nodeid = localnode->node->id;
sub.id = InvalidOid;
sub.name = sub_name;
sub.origin_if = &originif;
sub.target_if = &targetif;
sub.replication_sets = replication_sets;
sub.forward_origins = textarray_to_list(forward_origin_names);
sub.enabled = true;
gen_slot_name(&slot_name, get_database_name(MyDatabaseId),
origin->name, sub_name);
sub.slot_name = pstrdup(NameStr(slot_name));
sub.apply_delay = apply_delay;
sub.force_text_transfer = force_text_transfer;
create_subscription(&sub);
/* Create synchronization status for the subscription. */
memset(&sync, 0, sizeof(SpockSyncStatus));
if (sync_structure && sync_data)
sync.kind = SYNC_KIND_FULL;
else if (sync_structure)
sync.kind = SYNC_KIND_STRUCTURE;
else if (sync_data)
sync.kind = SYNC_KIND_DATA;
else
sync.kind = SYNC_KIND_INIT;
sync.subid = sub.id;
sync.status = SYNC_STATUS_INIT;
create_local_sync_status(&sync);
PG_RETURN_OID(sub.id);
}
/*
* Remove subscribption.
*/
Datum
spock_drop_subscription(PG_FUNCTION_ARGS)
{
char *sub_name = NameStr(*PG_GETARG_NAME(0));
bool ifexists = PG_GETARG_BOOL(1);
SpockSubscription *sub;
sub = get_subscription_by_name(sub_name, ifexists);
if (sub != NULL)
{
SpockWorker *apply;
List *other_subs;
SpockLocalNode *node;
node = get_local_node(true, false);
/* First drop the status. */
drop_subscription_sync_status(sub->id);
/* Drop the actual subscription. */
drop_subscription(sub->id);
/*
* The rest is different depending on if we are doing this on provider
* or subscriber.
*
* For now on provider we just exist (there should be no records
* of subscribers on their provider node).
*/
if (sub->origin->id == node->node->id)
PG_RETURN_BOOL(sub != NULL);
/*
* If the provider node record existed only for the dropped,
* subscription, it should be dropped as well.
*/
other_subs = get_node_subscriptions(sub->origin->id, true);
if (list_length(other_subs) == 0)
{
drop_node_interfaces(sub->origin->id);
drop_node(sub->origin->id);
}
/* Kill the apply to unlock the resources. */
LWLockAcquire(SpockCtx->lock, LW_EXCLUSIVE);
apply = spock_apply_find(MyDatabaseId, sub->id);
spock_worker_kill(apply);
LWLockRelease(SpockCtx->lock);
/* Wait for the apply to die. */
for (;;)
{
int rc;
LWLockAcquire(SpockCtx->lock, LW_EXCLUSIVE);
apply = spock_apply_find(MyDatabaseId, sub->id);
if (!spock_worker_running(apply))
{
LWLockRelease(SpockCtx->lock);
break;
}
LWLockRelease(SpockCtx->lock);
CHECK_FOR_INTERRUPTS();
rc = WaitLatch(&MyProc->procLatch,
WL_LATCH_SET | WL_TIMEOUT | WL_POSTMASTER_DEATH, 1000L);
if (rc & WL_POSTMASTER_DEATH)
proc_exit(1);
ResetLatch(&MyProc->procLatch);
}
/*
* Drop the slot on remote side.
*
* Note, we can't fail here since we can't assume that the remote node
* is still reachable or even alive.
*/
PG_TRY();
{
PGconn *origin_conn = spock_connect(sub->origin_if->dsn,
sub->name, "cleanup");
spock_drop_remote_slot(origin_conn, sub->slot_name);
PQfinish(origin_conn);
}
PG_CATCH();
{
FlushErrorState();
elog(WARNING, "could not drop slot \"%s\" on provider, you will probably have to drop it manually",
sub->slot_name);
}
PG_END_TRY();
/* Drop the origin tracking locally. */
replorigin_drop_by_name(sub->slot_name, true, false);
}
PG_RETURN_BOOL(sub != NULL);
}
/*
* Disable subscription.
*/
Datum
spock_alter_subscription_disable(PG_FUNCTION_ARGS)
{
char *sub_name = NameStr(*PG_GETARG_NAME(0));
bool immediate = PG_GETARG_BOOL(1);
SpockSubscription *sub = get_subscription_by_name(sub_name, false);
/* XXX: Only used for locking purposes. */
(void) get_local_node(true, false);
sub->enabled = false;
alter_subscription(sub);
if (immediate)
{
SpockWorker *apply;
if ((IsTransactionBlock() || IsSubTransaction()))
ereport(ERROR,
(errcode(ERRCODE_ACTIVE_SQL_TRANSACTION),
errmsg("alter_subscription_disable with immediate = true "
"cannot be run inside a transaction block")));
LWLockAcquire(SpockCtx->lock, LW_EXCLUSIVE);
apply = spock_apply_find(MyDatabaseId, sub->id);
spock_worker_kill(apply);
LWLockRelease(SpockCtx->lock);
}
PG_RETURN_BOOL(true);
}
/*
* Enable subscription.
*/
Datum
spock_alter_subscription_enable(PG_FUNCTION_ARGS)
{
char *sub_name = NameStr(*PG_GETARG_NAME(0));
bool immediate = PG_GETARG_BOOL(1);
SpockSubscription *sub = get_subscription_by_name(sub_name, false);
/* XXX: Only used for locking purposes. */
(void) get_local_node(true, false);
sub->enabled = true;
alter_subscription(sub);
/*
* There is nothing more to immediate here than running it outside of
* transaction.
*/
if (immediate && (IsTransactionBlock() || IsSubTransaction()))
{
ereport(ERROR,
(errcode(ERRCODE_ACTIVE_SQL_TRANSACTION),
errmsg("alter_subscription_enable with immediate = true "
"cannot be run inside a transaction block")));
}
PG_RETURN_BOOL(true);
}
/*
* Switch interface the subscription is using.
*/
Datum
spock_alter_subscription_interface(PG_FUNCTION_ARGS)
{
char *sub_name = NameStr(*PG_GETARG_NAME(0));
char *if_name = NameStr(*PG_GETARG_NAME(1));
SpockSubscription *sub = get_subscription_by_name(sub_name, false);
SpockInterface *new_if;
/* XXX: Only used for locking purposes. */
(void) get_local_node(true, false);
new_if = get_node_interface_by_name(sub->origin->id, if_name, false);
if (new_if->id == sub->origin_if->id)
PG_RETURN_BOOL(false);
sub->origin_if = new_if;
alter_subscription(sub);
PG_RETURN_BOOL(true);
}
/*
* Add replication set to subscription.
*/
Datum
spock_alter_subscription_add_replication_set(PG_FUNCTION_ARGS)
{
char *sub_name = NameStr(*PG_GETARG_NAME(0));
char *repset_name = NameStr(*PG_GETARG_NAME(1));
SpockSubscription *sub = get_subscription_by_name(sub_name, false);
ListCell *lc;
foreach (lc, sub->replication_sets)
{
char *rs = (char *) lfirst(lc);
if (strcmp(rs, repset_name) == 0)
PG_RETURN_BOOL(false);
}
sub->replication_sets = lappend(sub->replication_sets, repset_name);
alter_subscription(sub);
PG_RETURN_BOOL(true);
}
/*
* Remove replication set to subscription.
*/
Datum
spock_alter_subscription_remove_replication_set(PG_FUNCTION_ARGS)
{
char *sub_name = NameStr(*PG_GETARG_NAME(0));
char *repset_name = NameStr(*PG_GETARG_NAME(1));
SpockSubscription *sub = get_subscription_by_name(sub_name, false);
ListCell *lc;
foreach(lc, sub->replication_sets)
{
char *rs = (char *) lfirst(lc);
if (strcmp(rs, repset_name) == 0)
{
sub->replication_sets = foreach_delete_current(sub->replication_sets,
lc);
alter_subscription(sub);
PG_RETURN_BOOL(true);
}
}
PG_RETURN_BOOL(false);
}
/*
* Synchronize all the missing tables.
*/
Datum
spock_alter_subscription_synchronize(PG_FUNCTION_ARGS)
{
char *sub_name = NameStr(*PG_GETARG_NAME(0));
bool truncate = PG_GETARG_BOOL(1);
SpockSubscription *sub = get_subscription_by_name(sub_name, false);
PGconn *conn;
List *remote_tables;
List *local_tables;
ListCell *lc;
/* Read table list from provider. */
conn = spock_connect(sub->origin_if->dsn, sub_name, "sync");
remote_tables = spock_get_remote_repset_tables(conn, sub->replication_sets);
PQfinish(conn);
local_tables = get_subscription_tables(sub->id);
/* Compare with sync status on subscription. And add missing ones. */
foreach (lc, remote_tables)
{
SpockRemoteRel *remoterel = lfirst(lc);
SpockSyncStatus *oldsync = NULL;
ListCell *llc;
foreach(llc, local_tables)
{
SpockSyncStatus *tablesync = (SpockSyncStatus *) lfirst(llc);
if (namestrcmp(&tablesync->nspname, remoterel->nspname) == 0 &&
namestrcmp(&tablesync->relname, remoterel->relname) == 0)
{
oldsync = tablesync;
local_tables = foreach_delete_current(local_tables, llc);
break;
}
}
if (!oldsync)
{
SpockSyncStatus newsync;
memset(&newsync, 0, sizeof(SpockSyncStatus));
newsync.kind = SYNC_KIND_DATA;
newsync.subid = sub->id;
namestrcpy(&newsync.nspname, remoterel->nspname);
namestrcpy(&newsync.relname, remoterel->relname);
newsync.status = SYNC_STATUS_INIT;
create_local_sync_status(&newsync);
if (truncate)
truncate_table(remoterel->nspname, remoterel->relname);
}
}
/*
* Any leftover local tables should not be replicated, remove the status
* for them.
*/
foreach (lc, local_tables)
{
SpockSyncStatus *tablesync = (SpockSyncStatus *) lfirst(lc);
drop_table_sync_status_for_sub(tablesync->subid,
NameStr(tablesync->nspname),
NameStr(tablesync->relname));
}
/* Tell apply to re-read sync statuses. */
spock_subscription_changed(sub->id, false);
PG_RETURN_BOOL(true);
}
/*
* Resynchronize one existing table.
*/
Datum
spock_alter_subscription_resynchronize_table(PG_FUNCTION_ARGS)
{
char *sub_name = NameStr(*PG_GETARG_NAME(0));
Oid reloid = PG_GETARG_OID(1);
bool truncate = PG_GETARG_BOOL(2);
SpockSubscription *sub = get_subscription_by_name(sub_name, false);
SpockSyncStatus *oldsync;
Relation rel;
char *nspname,
*relname;
rel = table_open(reloid, AccessShareLock);
nspname = get_namespace_name(RelationGetNamespace(rel));
relname = RelationGetRelationName(rel);
/* Reset sync status of the table. */
oldsync = get_table_sync_status(sub->id, nspname, relname, true);
if (oldsync)
{
if (oldsync->status != SYNC_STATUS_READY &&
oldsync->status != SYNC_STATUS_SYNCDONE &&
oldsync->status != SYNC_STATUS_NONE)
elog(ERROR, "table %s.%s is already being synchronized",
nspname, relname);
set_table_sync_status(sub->id, nspname, relname, SYNC_STATUS_INIT,
InvalidXLogRecPtr);
}
else
{
SpockSyncStatus newsync;
memset(&newsync, 0, sizeof(SpockSyncStatus));
newsync.kind = SYNC_KIND_DATA;
newsync.subid = sub->id;
namestrcpy(&newsync.nspname, nspname);
namestrcpy(&newsync.relname, relname);
newsync.status = SYNC_STATUS_INIT;
create_local_sync_status(&newsync);
}
table_close(rel, NoLock);
if (truncate)
truncate_table(nspname, relname);
/* Tell apply to re-read sync statuses. */
spock_subscription_changed(sub->id, false);
PG_RETURN_BOOL(true);
}
/*
* Synchronize one sequence.
*/
Datum
spock_synchronize_sequence(PG_FUNCTION_ARGS)
{
Oid reloid = PG_GETARG_OID(0);
/* Check that this is actually a node. */
(void) get_local_node(true, false);
synchronize_sequence(reloid);
PG_RETURN_BOOL(true);
}
static char *
sync_status_to_string(char status)
{
switch (status)
{
case SYNC_STATUS_INIT:
return "sync_init";
case SYNC_STATUS_STRUCTURE:
return "sync_structure";
case SYNC_STATUS_DATA:
return "sync_data";
case SYNC_STATUS_CONSTRAINTS:
return "sync_constraints";
case SYNC_STATUS_SYNCWAIT:
return "sync_waiting";
case SYNC_STATUS_CATCHUP:
return "catchup";
case SYNC_STATUS_SYNCDONE:
return "synchronized";
case SYNC_STATUS_READY:
return "replicating";
default: