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52leaks.t
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52leaks.t
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use strict;
use warnings;
# Do the override as early as possible so that CORE::bless doesn't get compiled away
# We will replace $bless_override only if we are in author mode
my $bless_override;
BEGIN {
$bless_override = sub {
CORE::bless( $_[0], (@_ > 1) ? $_[1] : caller() );
};
*CORE::GLOBAL::bless = sub { goto $bless_override };
}
use Test::More;
BEGIN {
plan skip_all => '5.13.6 leaks like a sieve (fixed in blead/cefd5c7c)'
if $] == '5.013006';
}
use Scalar::Util qw/refaddr reftype weaken/;
use Carp qw/longmess/;
use Try::Tiny;
use lib qw(t/lib);
use DBICTest::RunMode;
my $have_test_cycle;
BEGIN {
require DBIx::Class::Optional::Dependencies;
$have_test_cycle = DBIx::Class::Optional::Dependencies->req_ok_for ('test_leaks')
and import Test::Memory::Cycle;
}
# this is what holds all weakened refs to be checked for leakage
my $weak_registry = {};
# Skip the heavy-duty leak tracing when just doing an install
unless (DBICTest::RunMode->is_plain) {
# Some modules are known to install singletons on-load
# Load them before we swap out $bless_override
require DBI;
require DBD::SQLite;
require Errno;
require Class::Struct;
require FileHandle;
require Hash::Merge;
no warnings qw/redefine once/;
no strict qw/refs/;
# redefine the bless override so that we can catch each and every object created
$bless_override = sub {
my $obj = CORE::bless(
$_[0], (@_ > 1) ? $_[1] : do {
my ($class, $fn, $line) = caller();
fail ("bless() of $_[0] into $class without explicit class specification at $fn line $line")
if $class =~ /^ (?: DBIx\:\:Class | DBICTest ) /x;
$class;
}
);
my $slot = (sprintf '%s=%s(0x%x)', # so we don't trigger stringification
ref $obj,
reftype $obj,
refaddr $obj,
);
# weaken immediately to avoid weird side effects
$weak_registry->{$slot} = { weakref => $obj, strace => longmess() };
weaken $weak_registry->{$slot}{weakref};
return $obj;
};
for my $func (qw/try catch finally/) {
my $orig = \&{"Try::Tiny::$func"};
*{"Try::Tiny::$func"} = sub (&;@) {
my $slot = sprintf ('CODE(0x%x)', refaddr $_[0]);
$weak_registry->{$slot} = { weakref => $_[0], strace => longmess() };
weaken $weak_registry->{$slot}{weakref};
goto $orig;
}
}
}
{
require DBICTest;
my $schema = DBICTest->init_schema;
my $rs = $schema->resultset ('Artist');
my $storage = $schema->storage;
ok ($storage->connected, 'we are connected');
my $row_obj = $rs->next;
ok ($row_obj, 'row from db');
my ($mc_row_obj, $pager, $pager_explicit_count) = $schema->txn_do (sub {
my $artist = $rs->create ({
name => 'foo artist',
cds => [{
title => 'foo cd',
year => 1984,
}],
});
my $pg = $rs->search({}, { rows => 1})->page(2)->pager;
my $pg_wcount = $rs->page(4)->pager->total_entries (66);
return ($artist, $pg, $pg_wcount);
});
is ($pager->next_page, 3, 'There is one more page available');
# based on 66 per 10 pages
is ($pager_explicit_count->last_page, 7, 'Correct last page');
my $base_collection = {
schema => $schema,
storage => $storage,
resultset => $rs,
row_object => $row_obj,
result_source => $rs->result_source,
fresh_pager => $rs->page(5)->pager,
pager => $pager,
pager_explicit_count => $pager_explicit_count,
sql_maker => $storage->sql_maker,
dbh => $storage->_dbh
};
memory_cycle_ok ($base_collection, 'No cycles in the object collection')
if $have_test_cycle;
for (keys %$base_collection) {
$weak_registry->{"basic $_"} = { weakref => $base_collection->{$_} };
weaken $weak_registry->{"basic $_"}{weakref};
}
}
memory_cycle_ok($weak_registry, 'No cycles in the weakened object collection')
if $have_test_cycle;
# Naturally we have some exceptions
my $cleared;
for my $slot (keys %$weak_registry) {
if ($slot =~ /^\QSQL::Translator/) {
# SQLT is a piece of shit, leaks all over
delete $weak_registry->{$slot};
}
elsif ($slot =~ /^\QHash::Merge/) {
# only clear one object - more would indicate trouble
delete $weak_registry->{$slot}
unless $cleared->{hash_merge_singleton}{$weak_registry->{$slot}{weakref}{behavior}}++;
}
}
# FIXME
# For reasons I can not yet fully understand the table() god-method (located in
# ::ResultSourceProxy::Table) attaches an actual source instance to each class
# as virtually *immortal* class-data.
# For now just blow away these instances manually but there got to be a saner way
$_->result_source_instance(undef) for (
'DBICTest::BaseResult',
map { DBICTest::Schema->class ($_) } DBICTest::Schema->sources
);
# FIXME
# same problem goes for the schema - its classdata contains live result source
# objects, which to add insult to the injury are *different* instances from the
# ones we destroyed above
DBICTest::Schema->source_registrations(undef);
my $tb = Test::More->builder;
for my $slot (keys %$weak_registry) {
ok (! defined $weak_registry->{$slot}{weakref}, "No leaks of $slot") or do {
my $diag = '';
$diag .= Devel::FindRef::track ($weak_registry->{$slot}{weakref}, 20) . "\n"
if ( $ENV{TEST_VERBOSE} && try { require Devel::FindRef });
if (my $stack = $weak_registry->{$slot}{strace}) {
$diag .= " Reference first seen$stack";
}
diag $diag if $diag;
};
}
done_testing;