use strict;
use warnings;
use Try::Tiny;
-use Scalar::Util qw/weaken blessed/;
-use DBIx::Class::Exception;
+use Scalar::Util qw(weaken blessed refaddr);
+use DBIx::Class;
+use DBIx::Class::_Util qw(is_exception detect_reinvoked_destructor);
use DBIx::Class::Carp;
-
-# temporary until we fix the $@ issue in core
-# we also need a real appendable, stackable exception object
-# (coming soon)
-BEGIN {
- if ($] >= 5.013001 and $] <= 5.013007) {
- *IS_BROKEN_PERL = sub () { 1 };
- }
- else {
- *IS_BROKEN_PERL = sub () { 0 };
- }
-}
-
use namespace::clean;
-my ($guards_count, $compat_handler, $foreign_handler);
-
sub new {
my ($class, $storage) = @_;
- $storage->txn_begin;
- my $guard = bless [ 0, $storage, $storage->_dbh ], ref $class || $class;
-
-
- # install a callback carefully
- if (IS_BROKEN_PERL and !$guards_count) {
-
- # if the thrown exception is a plain string, wrap it in our
- # own exception class
- # this is actually a pretty cool idea, may very well keep it
- # after perl is fixed
- $compat_handler ||= bless(
- sub {
- $@ = (blessed($_[0]) or ref($_[0]))
- ? $_[0]
- : bless ( { msg => $_[0] }, 'DBIx::Class::Exception')
- ;
- die;
- },
- '__TxnScopeGuard__FIXUP__',
+ my $guard = {
+ inactivated => 0,
+ storage => $storage,
+ };
+
+ # we are starting with an already set $@ - in order for things to work we need to
+ # be able to recognize it upon destruction - store its weakref
+ # recording it before doing the txn_begin stuff
+ #
+ # FIXME FRAGILE - any eval that fails but *does not* rethrow between here
+ # and the unwind will trample over $@ and invalidate the entire mechanism
+ # There got to be a saner way of doing this...
+ if (is_exception $@) {
+ weaken(
+ $guard->{existing_exception_ref} = (ref($@) eq '') ? \$@ : $@
);
-
- if ($foreign_handler = $SIG{__DIE__}) {
- $SIG{__DIE__} = bless (
- sub {
- # we trust the foreign handler to do whatever it wants, all we do is set $@
- eval { $compat_handler->(@_) };
- $foreign_handler->(@_);
- },
- '__TxnScopeGuard__FIXUP__',
- );
- }
- else {
- $SIG{__DIE__} = $compat_handler;
- }
}
- $guards_count++;
+ $storage->txn_begin;
+
+ weaken( $guard->{dbh} = $storage->_dbh );
+
+ bless $guard, ref $class || $class;
- weaken ($guard->[2]);
$guard;
}
sub commit {
my $self = shift;
- $self->[1]->txn_commit;
- $self->[0] = 1;
+ $self->{storage}->throw_exception("Refusing to execute multiple commits on scope guard $self")
+ if $self->{inactivated};
+
+ $self->{storage}->txn_commit;
+ $self->{inactivated} = 1;
}
sub DESTROY {
- my ($dismiss, $storage) = @{$_[0]};
-
- $guards_count--;
-
- # don't touch unless it's ours, and there are no more of us left
- if (
- IS_BROKEN_PERL
- and
- !$guards_count
- ) {
+ return if &detect_reinvoked_destructor;
- if (ref $SIG{__DIE__} eq '__TxnScopeGuard__FIXUP__') {
- # restore what we saved
- if ($foreign_handler) {
- $SIG{__DIE__} = $foreign_handler;
- }
- else {
- delete $SIG{__DIE__};
- }
- }
-
- # make sure we do not leak the foreign one in case it exists
- undef $foreign_handler;
- }
+ my $self = shift;
- return if $dismiss;
+ return if $self->{inactivated};
- # if our dbh is not ours anymore, the weakref will go undef
- $storage->_verify_pid;
- return unless $_[0]->[2];
+ # if our dbh is not ours anymore, the $dbh weakref will go undef
+ $self->{storage}->_verify_pid unless DBIx::Class::_ENV_::BROKEN_FORK;
+ return unless $self->{dbh};
- my $exception = $@;
+ my $exception = $@ if (
+ is_exception $@
+ and
+ (
+ ! defined $self->{existing_exception_ref}
+ or
+ refaddr( ref($@) eq '' ? \$@ : $@ ) != refaddr($self->{existing_exception_ref})
+ )
+ );
{
local $@;
carp 'A DBIx::Class::Storage::TxnScopeGuard went out of scope without explicit commit or error. Rolling back.'
- unless $exception;
+ unless defined $exception;
my $rollback_exception;
# do minimal connectivity check due to weird shit like
# https://rt.cpan.org/Public/Bug/Display.html?id=62370
- try { $storage->_seems_connected && $storage->txn_rollback }
+ try { $self->{storage}->_seems_connected && $self->{storage}->txn_rollback }
catch { $rollback_exception = shift };
if ( $rollback_exception and (
}
}
- $@ = $exception unless IS_BROKEN_PERL;
+ $@ = $exception;
}
1;
L<DBIx::Class::Schema/txn_scope_guard>.
-=head1 AUTHOR
+L<Scope::Guard> by chocolateboy (inspiration for this module)
-Ash Berlin, 2008.
+=head1 FURTHER QUESTIONS?
-Inspired by L<Scope::Guard> by chocolateboy.
+Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.
-This module is free software. It may be used, redistributed and/or modified
-under the same terms as Perl itself.
+=head1 COPYRIGHT AND LICENSE
-=cut
+This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
+by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
+redistribute it and/or modify it under the same terms as the
+L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.