Clarify name of guard function from 3d56e026, add it globally

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / _Util.pm

diff --git a/lib/DBIx/Class/_Util.pm b/lib/DBIx/Class/_Util.pm
index 56bcbd6..8d25ec0 100644 (file)
--- a/lib/DBIx/Class/_Util.pm
+++ b/lib/DBIx/Class/_Util.pm
@@ -60,25 +60,9 @@ use DBIx::Class::Carp '^DBIx::Class|^DBICTest';
 use B ();
 use Carp 'croak';
 use Storable 'nfreeze';
-use Scalar::Util qw(weaken blessed reftype);
+use Scalar::Util qw(weaken blessed reftype refaddr);
 use List::Util qw(first);
-
-# DO NOT edit away without talking to riba first, he will just put it back
-# BEGIN pre-Moo2 import block
-BEGIN {
-  my $initial_fatal_bits = (${^WARNING_BITS}||'') & $warnings::DeadBits{all};
-
-  local $ENV{PERL_STRICTURES_EXTRA} = 0;
-  # load all of these now, so that lazy-loading does not escape
-  # the current PERL_STRICTURES_EXTRA setting
-  require Sub::Quote;
-  require Sub::Defer;
-
-  Sub::Quote->import('quote_sub');
-  ${^WARNING_BITS} &= ( $initial_fatal_bits | ~ $warnings::DeadBits{all} );
-}
-sub qsub ($) { goto &quote_sub }  # no point depping on new Moo just for this
-# END pre-Moo2 import block
+use Sub::Quote qw(qsub quote_sub);
 
 # Already correctly prototyped: perlbrew exec perl -MStorable -e 'warn prototype \&Storable::dclone'
 BEGIN { *deep_clone = \&Storable::dclone }
@@ -87,7 +71,7 @@ use base 'Exporter';
 our @EXPORT_OK = qw(
   sigwarn_silencer modver_gt_or_eq modver_gt_or_eq_and_lt
   fail_on_internal_wantarray fail_on_internal_call
-  refdesc refcount hrefaddr is_exception
+  refdesc refcount hrefaddr is_exception detected_reinvoked_destructor
   quote_sub qsub perlstring serialize deep_clone
   UNRESOLVABLE_CONDITION
 );
@@ -106,7 +90,7 @@ sub sigwarn_silencer ($) {
 
 sub perlstring ($) { q{"}. quotemeta( shift ). q{"} };
 
-sub hrefaddr ($) { sprintf '0x%x', &Scalar::Util::refaddr||0 }
+sub hrefaddr ($) { sprintf '0x%x', &refaddr||0 }
 
 sub refdesc ($) {
   croak "Expecting a reference" if ! length ref $_[0];
@@ -116,7 +100,7 @@ sub refdesc ($) {
   sprintf '%s%s(0x%x)',
     ( defined( $_[1] = blessed $_[0]) ? "$_[1]=" : '' ),
     reftype $_[0],
-    Scalar::Util::refaddr($_[0]),
+    refaddr($_[0]),
   ;
 }
 
@@ -185,6 +169,54 @@ sub is_exception ($) {
   return $not_blank;
 }
 
+{
+  my $destruction_registry = {};
+
+  sub CLONE {
+    $destruction_registry = { map
+      { defined $_ ? ( refaddr($_) => $_ ) : () }
+      values %$destruction_registry
+    };
+  }
+
+  # This is almost invariably invoked from within DESTROY
+  # throwing exceptions won't work
+  sub detected_reinvoked_destructor {
+
+    # quick "garbage collection" pass - prevents the registry
+    # from slowly growing with a bunch of undef-valued keys
+    defined $destruction_registry->{$_} or delete $destruction_registry->{$_}
+      for keys %$destruction_registry;
+
+    if (! length ref $_[0]) {
+      printf STDERR '%s() expects a blessed reference %s',
+        (caller(0))[3],
+        Carp::longmess,
+      ;
+      return undef; # don't know wtf to do
+    }
+    elsif (! defined $destruction_registry->{ my $addr = refaddr($_[0]) } ) {
+      weaken( $destruction_registry->{$addr} = $_[0] );
+      return 0;
+    }
+    else {
+      carp_unique ( sprintf (
+        'Preventing *MULTIPLE* DESTROY() invocations on %s - an *EXTREMELY '
+      . 'DANGEROUS* condition which is *ALMOST CERTAINLY GLOBAL* within your '
+      . 'application, affecting *ALL* classes without active protection against '
+      . 'this. Diagnose and fix the root cause ASAP!!!%s',
+      refdesc $_[0],
+        ( ( $INC{'Devel/StackTrace.pm'} and ! do { local $@; eval { Devel::StackTrace->VERSION(2) } } )
+          ? " (likely culprit Devel::StackTrace\@@{[ Devel::StackTrace->VERSION ]} found in %INC, http://is.gd/D_ST_refcap)"
+          : ''
+        )
+      ));
+
+      return 1;
+    }
+  }
+}
+
 sub modver_gt_or_eq ($$) {
   my ($mod, $ver) = @_;