1# Testing of logical decoding using SQL interface and/or pg_recvlogical 2# 3# Most logical decoding tests are in contrib/test_decoding. This module 4# is for work that doesn't fit well there, like where server restarts 5# are required. 6use strict; 7use warnings; 8use PostgresNode; 9use TestLib; 10use Test::More tests => 10; 11use Config; 12 13# Initialize master node 14my $node_master = get_new_node('master'); 15$node_master->init(allows_streaming => 1); 16$node_master->append_conf( 17 'postgresql.conf', qq( 18wal_level = logical 19)); 20$node_master->start; 21my $backup_name = 'master_backup'; 22 23$node_master->safe_psql('postgres', 24 qq[CREATE TABLE decoding_test(x integer, y text);]); 25 26$node_master->safe_psql('postgres', 27qq[SELECT pg_create_logical_replication_slot('test_slot', 'test_decoding');]); 28 29$node_master->safe_psql('postgres', 30qq[INSERT INTO decoding_test(x,y) SELECT s, s::text FROM generate_series(1,10) s;] 31); 32 33# Basic decoding works 34my ($result) = $node_master->safe_psql('postgres', 35 qq[SELECT pg_logical_slot_get_changes('test_slot', NULL, NULL);]); 36is(scalar(my @foobar = split /^/m, $result), 37 12, 'Decoding produced 12 rows inc BEGIN/COMMIT'); 38 39# If we immediately crash the server we might lose the progress we just made 40# and replay the same changes again. But a clean shutdown should never repeat 41# the same changes when we use the SQL decoding interface. 42$node_master->restart('fast'); 43 44# There are no new writes, so the result should be empty. 45$result = $node_master->safe_psql('postgres', 46 qq[SELECT pg_logical_slot_get_changes('test_slot', NULL, NULL);]); 47chomp($result); 48is($result, '', 'Decoding after fast restart repeats no rows'); 49 50# Insert some rows and verify that we get the same results from pg_recvlogical 51# and the SQL interface. 52$node_master->safe_psql('postgres', 53qq[INSERT INTO decoding_test(x,y) SELECT s, s::text FROM generate_series(1,4) s;] 54); 55 56my $expected = q{BEGIN 57table public.decoding_test: INSERT: x[integer]:1 y[text]:'1' 58table public.decoding_test: INSERT: x[integer]:2 y[text]:'2' 59table public.decoding_test: INSERT: x[integer]:3 y[text]:'3' 60table public.decoding_test: INSERT: x[integer]:4 y[text]:'4' 61COMMIT}; 62 63my $stdout_sql = $node_master->safe_psql('postgres', 64qq[SELECT data FROM pg_logical_slot_peek_changes('test_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');] 65); 66is($stdout_sql, $expected, 'got expected output from SQL decoding session'); 67 68my $endpos = $node_master->safe_psql('postgres', 69"SELECT lsn FROM pg_logical_slot_peek_changes('test_slot', NULL, NULL) ORDER BY lsn DESC LIMIT 1;" 70); 71print "waiting to replay $endpos\n"; 72 73# Insert some rows after $endpos, which we won't read. 74$node_master->safe_psql('postgres', 75 qq[INSERT INTO decoding_test(x,y) SELECT s, s::text FROM generate_series(5,50) s;] 76); 77 78my $stdout_recv = $node_master->pg_recvlogical_upto( 79 'postgres', 'test_slot', $endpos, 180, 80 'include-xids' => '0', 81 'skip-empty-xacts' => '1'); 82chomp($stdout_recv); 83is($stdout_recv, $expected, 84 'got same expected output from pg_recvlogical decoding session'); 85 86$node_master->poll_query_until('postgres', 87"SELECT EXISTS (SELECT 1 FROM pg_replication_slots WHERE slot_name = 'test_slot' AND active_pid IS NULL)" 88) 89 or die "slot never became inactive"; 90 91$stdout_recv = $node_master->pg_recvlogical_upto( 92 'postgres', 'test_slot', $endpos, 180, 93 'include-xids' => '0', 94 'skip-empty-xacts' => '1'); 95chomp($stdout_recv); 96is($stdout_recv, '', 97 'pg_recvlogical acknowledged changes'); 98 99$node_master->safe_psql('postgres', 'CREATE DATABASE otherdb'); 100 101is( $node_master->psql( 102 'otherdb', 103"SELECT lsn FROM pg_logical_slot_peek_changes('test_slot', NULL, NULL) ORDER BY lsn DESC LIMIT 1;" 104 ), 105 3, 106 'replaying logical slot from another database fails'); 107 108$node_master->safe_psql('otherdb', 109qq[SELECT pg_create_logical_replication_slot('otherdb_slot', 'test_decoding');] 110); 111 112# make sure you can't drop a slot while active 113SKIP: 114{ 115 116 # some Windows Perls at least don't like IPC::Run's start/kill_kill regime. 117 skip "Test fails on Windows perl", 2 if $Config{osname} eq 'MSWin32'; 118 119 my $pg_recvlogical = IPC::Run::start( 120 [ 'pg_recvlogical', '-d', $node_master->connstr('otherdb'), 121 '-S', 'otherdb_slot', '-f', '-', '--start' ]); 122 $node_master->poll_query_until('otherdb', 123"SELECT EXISTS (SELECT 1 FROM pg_replication_slots WHERE slot_name = 'otherdb_slot' AND active_pid IS NOT NULL)" 124 ) or die "slot never became active"; 125 is($node_master->psql('postgres', 'DROP DATABASE otherdb'), 126 3, 'dropping a DB with active logical slots fails'); 127 $pg_recvlogical->kill_kill; 128 is($node_master->slot('otherdb_slot')->{'slot_name'}, 129 undef, 'logical slot still exists'); 130} 131 132$node_master->poll_query_until('otherdb', 133"SELECT EXISTS (SELECT 1 FROM pg_replication_slots WHERE slot_name = 'otherdb_slot' AND active_pid IS NULL)" 134) or die "slot never became inactive"; 135 136is($node_master->psql('postgres', 'DROP DATABASE otherdb'), 137 0, 'dropping a DB with inactive logical slots succeeds'); 138is($node_master->slot('otherdb_slot')->{'slot_name'}, 139 undef, 'logical slot was actually dropped with DB'); 140 141# done with the node 142$node_master->stop; 143