
# Copyright (c) 2021, PostgreSQL Global Development Group

# Test streaming of large transaction containing multiple subtransactions and rollbacks
use strict;
use warnings;
use PostgresNode;
use TestLib;
use Test::More tests => 4;

# Create publisher node
my $node_publisher = get_new_node('publisher');
$node_publisher->init(allows_streaming => 'logical');
$node_publisher->append_conf('postgresql.conf', 'logical_decoding_work_mem = 64kB');
$node_publisher->start;

# Create subscriber node
my $node_subscriber = get_new_node('subscriber');
$node_subscriber->init(allows_streaming => 'logical');
$node_subscriber->start;

# Create some preexisting content on publisher
$node_publisher->safe_psql('postgres',
	"CREATE TABLE test_tab (a int primary key, b varchar)");
$node_publisher->safe_psql('postgres',
	"INSERT INTO test_tab VALUES (1, 'foo'), (2, 'bar')");

# Setup structure on subscriber
$node_subscriber->safe_psql('postgres', "CREATE TABLE test_tab (a int primary key, b text, c INT, d INT, e INT)");

# Setup logical replication
my $publisher_connstr = $node_publisher->connstr . ' dbname=postgres';
$node_publisher->safe_psql('postgres', "CREATE PUBLICATION tap_pub FOR TABLE test_tab");

my $appname = 'tap_sub';
$node_subscriber->safe_psql('postgres',
"CREATE SUBSCRIPTION tap_sub CONNECTION '$publisher_connstr application_name=$appname' PUBLICATION tap_pub WITH (streaming = on)"
);

$node_publisher->wait_for_catchup($appname);

# Also wait for initial table sync to finish
my $synced_query =
"SELECT count(1) = 0 FROM pg_subscription_rel WHERE srsubstate NOT IN ('r', 's');";
$node_subscriber->poll_query_until('postgres', $synced_query)
  or die "Timed out while waiting for subscriber to synchronize data";

my $result =
  $node_subscriber->safe_psql('postgres', "SELECT count(*), count(c) FROM test_tab");
is($result, qq(2|0), 'check initial data was copied to subscriber');

# large (streamed) transaction with DDL, DML and ROLLBACKs
$node_publisher->safe_psql('postgres', q{
BEGIN;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(3,500) s(i);
SAVEPOINT s1;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(501,1000) s(i);
SAVEPOINT s2;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(1001,1500) s(i);
SAVEPOINT s3;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(1501,2000) s(i);
ROLLBACK TO s2;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(2001,2500) s(i);
ROLLBACK TO s1;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(2501,3000) s(i);
SAVEPOINT s4;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(3001,3500) s(i);
SAVEPOINT s5;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(3501,4000) s(i);
COMMIT;
});

$node_publisher->wait_for_catchup($appname);

$result =
  $node_subscriber->safe_psql('postgres', "SELECT count(*), count(c) FROM test_tab");
is($result, qq(2000|0), 'check rollback to savepoint was reflected on subscriber and extra columns contain local defaults');

# large (streamed) transaction with subscriber receiving out of order
# subtransaction ROLLBACKs
$node_publisher->safe_psql('postgres', q{
BEGIN;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(4001,4500) s(i);
SAVEPOINT s1;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(5001,5500) s(i);
SAVEPOINT s2;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(6001,6500) s(i);
SAVEPOINT s3;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(7001,7500) s(i);
RELEASE s2;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(8001,8500) s(i);
ROLLBACK TO s1;
COMMIT;
});

$node_publisher->wait_for_catchup($appname);

$result =
  $node_subscriber->safe_psql('postgres', "SELECT count(*), count(c) FROM test_tab");
is($result, qq(2500|0), 'check rollback to savepoint was reflected on subscriber');

# large (streamed) transaction with subscriber receiving rollback
$node_publisher->safe_psql('postgres', q{
BEGIN;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(8501,9000) s(i);
SAVEPOINT s1;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(9001,9500) s(i);
SAVEPOINT s2;
INSERT INTO test_tab SELECT i, md5(i::text) FROM generate_series(9501,10000) s(i);
ROLLBACK;
});

$node_publisher->wait_for_catchup($appname);

$result =
  $node_subscriber->safe_psql('postgres', "SELECT count(*), count(c) FROM test_tab");
is($result, qq(2500|0), 'check rollback was reflected on subscriber');

$node_subscriber->stop;
$node_publisher->stop;
