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 detected_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) = @_;
+ 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...
+ #
+ # Deliberately *NOT* using is_exception - if someone left a misbehaving
+ # antipattern value in $@, it's not our business to whine about it
+ weaken(
+ $guard->{existing_exception_ref} = (length ref $@) ? $@ : \$@
+ ) if( defined $@ and length $@ );
+
$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 => $_[0] }, 'DBIx::Class::Exception')
- ;
- die;
- },
- '__TxnScopeGuard__FIXUP__',
- );
- if ($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;
- }
- }
+ weaken( $guard->{dbh} = $storage->_dbh );
- $guards_count++;
+ 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};
+
+ # FIXME - this assumption may be premature: a commit may fail and a rollback
+ # *still* be necessary. Currently I am not aware of such scenarious, but I
+ # also know the deferred constraint handling is *severely* undertested.
+ # Making the change of "fire txn and never come back to this" in order to
+ # address RT#107159, but this *MUST* be reevaluated later.
+ $self->{inactivated} = 1;
+ $self->{storage}->txn_commit;
}
sub DESTROY {
- my ($dismiss, $storage) = @{$_[0]};
+ return if &detected_reinvoked_destructor;
+
+ return if $_[0]->{inactivated};
+
+
+ # grab it before we've done volatile stuff below
+ my $current_exception = (
+ is_exception $@
+ and
+ (
+ ! defined $_[0]->{existing_exception_ref}
+ or
+ refaddr( (length ref $@) ? $@ : \$@ ) != refaddr($_[0]->{existing_exception_ref})
+ )
+ )
+ ? $@
+ : undef
+ ;
+
+
+ # if our dbh is not ours anymore, the $dbh weakref will go undef
+ $_[0]->{storage}->_verify_pid unless DBIx::Class::_ENV_::BROKEN_FORK;
+ return unless defined $_[0]->{dbh};
+
+
+ carp 'A DBIx::Class::Storage::TxnScopeGuard went out of scope without explicit commit or error. Rolling back'
+ unless defined $current_exception;
- $guards_count--;
- # don't touch unless it's ours, and there are no more of us left
if (
- IS_BROKEN_PERL
+ my $rollback_exception = $_[0]->{storage}->__delicate_rollback(
+ defined $current_exception
+ ? \$current_exception
+ : ()
+ )
and
- !$guards_count
+ ! defined $current_exception
) {
-
- 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;
+ carp (join ' ',
+ "********************* ROLLBACK FAILED!!! ********************",
+ "\nA rollback operation failed after the guard went out of scope.",
+ 'This is potentially a disastrous situation, check your data for',
+ "consistency: $rollback_exception"
+ );
}
- return if $dismiss;
-
- # if our dbh is not ours anymore, the weakref will go undef
- $storage->_verify_pid;
- return unless $_[0]->[2];
-
- my $exception = $@;
-
- {
- local $@;
-
- carp 'A DBIx::Class::Storage::TxnScopeGuard went out of scope without explicit commit or error. Rolling back.'
- unless $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 }
- catch { $rollback_exception = shift };
-
- if ( $rollback_exception and (
- ! defined blessed $rollback_exception
- or
- ! $rollback_exception->isa('DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION')
- ) ) {
- # append our text - THIS IS A TEMPORARY FIXUP!
- # a real stackable exception object is in the works
- if (ref $exception eq 'DBIx::Class::Exception') {
- $exception->{msg} = "Transaction aborted: $exception->{msg} "
- ."Rollback failed: ${rollback_exception}";
- }
- elsif ($exception) {
- $exception = "Transaction aborted: ${exception} "
- ."Rollback failed: ${rollback_exception}";
- }
- else {
- carp (join ' ',
- "********************* ROLLBACK FAILED!!! ********************",
- "\nA rollback operation failed after the guard went out of scope.",
- 'This is potentially a disastrous situation, check your data for',
- "consistency: $rollback_exception"
- );
- }
- }
- }
+ $@ = $current_exception
+ if DBIx::Class::_ENV_::UNSTABLE_DOLLARAT;
- $@ = $exception unless IS_BROKEN_PERL;
+ # Dummy NEXTSTATE ensuring the all temporaries on the stack are garbage
+ # collected before leaving this scope. Depending on the code above, this
+ # may very well be just a preventive measure guarding future modifications
+ undef;
}
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>.
projects / dbsrgits/DBIx-Class.git / blobdiff