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

package # hide from PAUSE
  DBIx::Class::_Util;

use warnings;
use strict;

# Temporary - tempextlib
use namespace::clean;
BEGIN {
  require Module::Runtime;
  require File::Spec;

  # There can be only one of these, make sure we get the bundled part and
  # *not* something off the site lib
  for (qw(
    DBIx::Class::SQLMaker
    SQL::Abstract
    SQL::Abstract::Test
  )) {
    if ($INC{Module::Runtime::module_notional_filename($_)}) {
      die "\nUnable to continue - a part of the bundled templib contents "
        . "was already loaded (likely an older version from CPAN). "
        . "Make sure that @{[ __PACKAGE__ ]} is loaded before $_\n\n"
      ;
    }
  }

  our ($HERE) = File::Spec->rel2abs(
    File::Spec->catdir( (File::Spec->splitpath(__FILE__))[1], '_TempExtlib' )
  ) =~ /^(.*)$/; # screw you, taint mode

  unshift @INC, $HERE;
}

use constant SPURIOUS_VERSION_CHECK_WARNINGS => ($] < 5.010 ? 1 : 0);

BEGIN {
  package # hide from pause
    DBIx::Class::_ENV_;

  use Config;

  use constant {

    # but of course
    BROKEN_FORK => ($^O eq 'MSWin32') ? 1 : 0,

    BROKEN_GOTO => ($] < '5.008003') ? 1 : 0,

    HAS_ITHREADS => $Config{useithreads} ? 1 : 0,

    # ::Runmode would only be loaded by DBICTest, which in turn implies t/
    DBICTEST => eval { DBICTest::RunMode->is_author } ? 1 : 0,

    # During 5.13 dev cycle HELEMs started to leak on copy
    # add an escape for these perls ON SMOKERS - a user will still get death
    PEEPEENESS => ( eval { DBICTest::RunMode->is_smoker } && ($] >= 5.013005 and $] <= 5.013006) ),

    SHUFFLE_UNORDERED_RESULTSETS => $ENV{DBIC_SHUFFLE_UNORDERED_RESULTSETS} ? 1 : 0,

    ASSERT_NO_INTERNAL_WANTARRAY => $ENV{DBIC_ASSERT_NO_INTERNAL_WANTARRAY} ? 1 : 0,

    ASSERT_NO_INTERNAL_INDIRECT_CALLS => $ENV{DBIC_ASSERT_NO_INTERNAL_INDIRECT_CALLS} ? 1 : 0,

    IV_SIZE => $Config{ivsize},

    OS_NAME => $^O,
  };

  if ($] < 5.009_005) {
    require MRO::Compat;
    constant->import( OLD_MRO => 1 );
  }
  else {
    require mro;
    constant->import( OLD_MRO => 0 );
  }
}

# FIXME - this is not supposed to be here
# Carp::Skip to the rescue soon
use DBIx::Class::Carp '^DBIx::Class|^DBICTest';

use Carp 'croak';
use Scalar::Util qw(weaken blessed reftype);
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;
  require Sub::Quote; 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 base 'Exporter';
our @EXPORT_OK = qw(
  sigwarn_silencer modver_gt_or_eq
  fail_on_internal_wantarray fail_on_internal_call
  refdesc refcount hrefaddr is_exception
  quote_sub qsub perlstring
  UNRESOLVABLE_CONDITION
);

use constant UNRESOLVABLE_CONDITION => \ '1 = 0';

sub sigwarn_silencer ($) {
  my $pattern = shift;

  croak "Expecting a regexp" if ref $pattern ne 'Regexp';

  my $orig_sig_warn = $SIG{__WARN__} || sub { CORE::warn(@_) };

  return sub { &$orig_sig_warn unless $_[0] =~ $pattern };
}

sub perlstring ($) { q{"}. quotemeta( shift ). q{"} };

sub hrefaddr ($) { sprintf '0x%x', &Scalar::Util::refaddr||0 }

sub refdesc ($) {
  croak "Expecting a reference" if ! length ref $_[0];

  # be careful not to trigger stringification,
  # reuse @_ as a scratch-pad
  sprintf '%s%s(0x%x)',
    ( defined( $_[1] = blessed $_[0]) ? "$_[1]=" : '' ),
    reftype $_[0],
    Scalar::Util::refaddr($_[0]),
  ;
}

sub refcount ($) {
  croak "Expecting a reference" if ! length ref $_[0];

  require B;
  # No tempvars - must operate on $_[0], otherwise the pad
  # will count as an extra ref
  B::svref_2object($_[0])->REFCNT;
}

sub is_exception ($) {
  my $e = $_[0];

  # this is not strictly correct - an eval setting $@ to undef
  # is *not* the same as an eval setting $@ to ''
  # but for the sake of simplicity assume the following for
  # the time being
  return 0 unless defined $e;

  my ($not_blank, $suberror);
  {
    local $@;
    eval {
      $not_blank = ($e ne '') ? 1 : 0;
      1;
    } or $suberror = $@;
  }

  if (defined $suberror) {
    if (length (my $class = blessed($e) )) {
      carp_unique( sprintf(
        'External exception class %s implements partial (broken) overloading '
      . 'preventing its instances from being used in simple ($x eq $y) '
      . 'comparisons. Given Perl\'s "globally cooperative" exception '
      . 'handling this type of brokenness is extremely dangerous on '
      . 'exception objects, as it may (and often does) result in silent '
      . '"exception substitution". DBIx::Class tries to work around this '
      . 'as much as possible, but other parts of your software stack may '
      . 'not be even aware of this. Please submit a bugreport against the '
      . 'distribution containing %s and in the meantime apply a fix similar '
      . 'to the one shown at %s, in order to ensure your exception handling '
      . 'is saner application-wide. What follows is the actual error text '
      . "as generated by Perl itself:\n\n%s\n ",
        $class,
        $class,
        'http://v.gd/DBIC_overload_tempfix/',
        $suberror,
      ));

      # workaround, keeps spice flowing
      $not_blank = ("$e" ne '') ? 1 : 0;
    }
    else {
      # not blessed yet failed the 'ne'... this makes 0 sense...
      # just throw further
      die $suberror
    }
  }

  return $not_blank;
}

sub modver_gt_or_eq ($$) {
  my ($mod, $ver) = @_;

  croak "Nonsensical module name supplied"
    if ! defined $mod or ! length $mod;

  croak "Nonsensical minimum version supplied"
    if ! defined $ver or $ver =~ /[^0-9\.\_]/;

  local $SIG{__WARN__} = sigwarn_silencer( qr/\Qisn't numeric in subroutine entry/ )
    if SPURIOUS_VERSION_CHECK_WARNINGS;

  croak "$mod does not seem to provide a version (perhaps it never loaded)"
    unless $mod->VERSION;

  local $@;
  eval { $mod->VERSION($ver) } ? 1 : 0;
}

{
  my $list_ctx_ok_stack_marker;

  sub fail_on_internal_wantarray () {
    return if $list_ctx_ok_stack_marker;

    if (! defined wantarray) {
      croak('fail_on_internal_wantarray() needs a tempvar to save the stack marker guard');
    }

    my $cf = 1;
    while ( ( (caller($cf+1))[3] || '' ) =~ / :: (?:

      # these are public API parts that alter behavior on wantarray
      search | search_related | slice | search_literal

        |

      # these are explicitly prefixed, since we only recognize them as valid
      # escapes when they come from the guts of CDBICompat
      CDBICompat .*? :: (?: search_where | retrieve_from_sql | retrieve_all )

    ) $/x ) {
      $cf++;
    }

    my ($fr, $want, $argdesc);
    {
      package DB;
      $fr = [ caller($cf) ];
      $want = ( caller($cf-1) )[5];
      $argdesc = ref $DB::args[0]
        ? DBIx::Class::_Util::refdesc($DB::args[0])
        : 'non '
      ;
    };

    if (
      $want and $fr->[0] =~ /^(?:DBIx::Class|DBICx::)/
    ) {
      DBIx::Class::Exception->throw( sprintf (
        "Improper use of %s instance in list context at %s line %d\n\n    Stacktrace starts",
        $argdesc, @{$fr}[1,2]
      ), 'with_stacktrace');
    }

    my $mark = [];
    weaken ( $list_ctx_ok_stack_marker = $mark );
    $mark;
  }
}

sub fail_on_internal_call {
  my ($fr, $argdesc);
  {
    package DB;
    $fr = [ caller(1) ];
    $argdesc = ref $DB::args[0]
      ? DBIx::Class::_Util::refdesc($DB::args[0])
      : undef
    ;
  };

  if (
    $argdesc
      and
    $fr->[0] =~ /^(?:DBIx::Class|DBICx::)/
      and
    $fr->[1] !~ /\b(?:CDBICompat|ResultSetProxy)\b/  # no point touching there
  ) {
    DBIx::Class::Exception->throw( sprintf (
      "Illegal internal call of indirect proxy-method %s() with argument %s: examine the last lines of the proxy method deparse below to determine what to call directly instead at %s on line %d\n\n%s\n\n    Stacktrace starts",
      $fr->[3], $argdesc, @{$fr}[1,2], ( $fr->[6] || do {
        require B::Deparse;
        no strict 'refs';
        B::Deparse->new->coderef2text(\&{$fr->[3]})
      }),
    ), 'with_stacktrace');
  }
}

1;
Commit	Line	Data
b1dbf716	1	package # hide from PAUSE
	2	DBIx::Class::_Util;
	3
	4	use warnings;
	5	use strict;
	6
d0435d75	7	# Temporary - tempextlib
	8	use namespace::clean;
	9	BEGIN {
	10	require Module::Runtime;
	11	require File::Spec;
	12
	13	# There can be only one of these, make sure we get the bundled part and
	14	# not something off the site lib
	15	for (qw(
	16	DBIx::Class::SQLMaker
	17	SQL::Abstract
	18	SQL::Abstract::Test
	19	)) {
	20	if ($INC{Module::Runtime::module_notional_filename($_)}) {
	21	die "\nUnable to continue - a part of the bundled templib contents "
	22	. "was already loaded (likely an older version from CPAN). "
	23	. "Make sure that @{[ __PACKAGE__ ]} is loaded before $_\n\n"
	24	;
	25	}
	26	}
	27
	28	our ($HERE) = File::Spec->rel2abs(
	29	File::Spec->catdir( (File::Spec->splitpath(__FILE__))[1], '_TempExtlib' )
	30	) =~ /^(.*)$/; # screw you, taint mode
	31
	32	unshift @INC, $HERE;
	33	}
	34
b1dbf716	35	use constant SPURIOUS_VERSION_CHECK_WARNINGS => ($] < 5.010 ? 1 : 0);
b1dbf716	36
37873f78	37	BEGIN {
	38	package # hide from pause
	39	DBIx::Class::_ENV_;
	40
	41	use Config;
	42
	43	use constant {
	44
	45	# but of course
	46	BROKEN_FORK => ($^O eq 'MSWin32') ? 1 : 0,
	47
8d73fcd4	48	BROKEN_GOTO => ($] < '5.008003') ? 1 : 0,
8d73fcd4	49
37873f78	50	HAS_ITHREADS => $Config{useithreads} ? 1 : 0,
	51
	52	# ::Runmode would only be loaded by DBICTest, which in turn implies t/
	53	DBICTEST => eval { DBICTest::RunMode->is_author } ? 1 : 0,
	54
	55	# During 5.13 dev cycle HELEMs started to leak on copy
6cfb1d2f	56	# add an escape for these perls ON SMOKERS - a user will still get death
6cfb1d2f	57	PEEPEENESS => ( eval { DBICTest::RunMode->is_smoker } && ($] >= 5.013005 and $] <= 5.013006) ),
37873f78	58
1b658919	59	SHUFFLE_UNORDERED_RESULTSETS => $ENV{DBIC_SHUFFLE_UNORDERED_RESULTSETS} ? 1 : 0,
1b658919	60
37873f78	61	ASSERT_NO_INTERNAL_WANTARRAY => $ENV{DBIC_ASSERT_NO_INTERNAL_WANTARRAY} ? 1 : 0,
37873f78	62
77c3a5dc	63	ASSERT_NO_INTERNAL_INDIRECT_CALLS => $ENV{DBIC_ASSERT_NO_INTERNAL_INDIRECT_CALLS} ? 1 : 0,
77c3a5dc	64
37873f78	65	IV_SIZE => $Config{ivsize},
00882d2c	66
00882d2c	67	OS_NAME => $^O,
37873f78	68	};
	69
	70	if ($] < 5.009_005) {
	71	require MRO::Compat;
	72	constant->import( OLD_MRO => 1 );
	73	}
	74	else {
	75	require mro;
	76	constant->import( OLD_MRO => 0 );
	77	}
	78	}
	79
841efcb3	80	# FIXME - this is not supposed to be here
	81	# Carp::Skip to the rescue soon
	82	use DBIx::Class::Carp '^DBIx::Class\|^DBICTest';
	83
	84	use Carp 'croak';
bf302897	85	use Scalar::Util qw(weaken blessed reftype);
3705e3b2	86	use List::Util qw(first);
b1dbf716	87
7f9a3f70	88	# DO NOT edit away without talking to riba first, he will just put it back
	89	# BEGIN pre-Moo2 import block
	90	BEGIN {
	91	my $initial_fatal_bits = (${^WARNING_BITS}\|\|'') & $warnings::DeadBits{all};
	92	local $ENV{PERL_STRICTURES_EXTRA} = 0;
	93	require Sub::Quote; Sub::Quote->import('quote_sub');
	94	${^WARNING_BITS} &= ( $initial_fatal_bits \| ~ $warnings::DeadBits{all} );
	95	}
	96	sub qsub ($) { goto &quote_sub } # no point depping on new Moo just for this
	97	# END pre-Moo2 import block
	98
b1dbf716	99	use base 'Exporter';
3705e3b2	100	our @EXPORT_OK = qw(
77c3a5dc	101	sigwarn_silencer modver_gt_or_eq
77c3a5dc	102	fail_on_internal_wantarray fail_on_internal_call
8433421f	103	refdesc refcount hrefaddr is_exception
7f9a3f70	104	quote_sub qsub perlstring
facd0e8e	105	UNRESOLVABLE_CONDITION
3705e3b2	106	);
052a832c	107
facd0e8e	108	use constant UNRESOLVABLE_CONDITION => \ '1 = 0';
facd0e8e	109
bf302897	110	sub sigwarn_silencer ($) {
052a832c	111	my $pattern = shift;
	112
	113	croak "Expecting a regexp" if ref $pattern ne 'Regexp';
	114
	115	my $orig_sig_warn = $SIG{__WARN__} \|\| sub { CORE::warn(@_) };
	116
	117	return sub { &$orig_sig_warn unless $_[0] =~ $pattern };
	118	}
b1dbf716	119
01b25f12	120	sub perlstring ($) { q{"}. quotemeta( shift ). q{"} };
01b25f12	121
8433421f	122	sub hrefaddr ($) { sprintf '0x%x', &Scalar::Util::refaddr\|\|0 }
	123
	124	sub refdesc ($) {
	125	croak "Expecting a reference" if ! length ref $_[0];
	126
	127	# be careful not to trigger stringification,
	128	# reuse @_ as a scratch-pad
	129	sprintf '%s%s(0x%x)',
	130	( defined( $_[1] = blessed $_[0]) ? "$_[1]=" : '' ),
	131	reftype $_[0],
	132	Scalar::Util::refaddr($_[0]),
	133	;
	134	}
bf302897	135
bf302897	136	sub refcount ($) {
dac7972a	137	croak "Expecting a reference" if ! length ref $_[0];
	138
	139	require B;
	140	# No tempvars - must operate on $_[0], otherwise the pad
	141	# will count as an extra ref
	142	B::svref_2object($_[0])->REFCNT;
	143	}
	144
841efcb3	145	sub is_exception ($) {
	146	my $e = $_[0];
	147
a0414138	148	# this is not strictly correct - an eval setting $@ to undef
	149	# is not the same as an eval setting $@ to ''
	150	# but for the sake of simplicity assume the following for
	151	# the time being
	152	return 0 unless defined $e;
	153
841efcb3	154	my ($not_blank, $suberror);
	155	{
	156	local $@;
	157	eval {
	158	$not_blank = ($e ne '') ? 1 : 0;
	159	1;
	160	} or $suberror = $@;
	161	}
	162
	163	if (defined $suberror) {
	164	if (length (my $class = blessed($e) )) {
	165	carp_unique( sprintf(
9bea2000	166	'External exception class %s implements partial (broken) overloading '
9bea2000	167	. 'preventing its instances from being used in simple ($x eq $y) '
841efcb3	168	. 'comparisons. Given Perl\'s "globally cooperative" exception '
	169	. 'handling this type of brokenness is extremely dangerous on '
	170	. 'exception objects, as it may (and often does) result in silent '
	171	. '"exception substitution". DBIx::Class tries to work around this '
	172	. 'as much as possible, but other parts of your software stack may '
	173	. 'not be even aware of this. Please submit a bugreport against the '
	174	. 'distribution containing %s and in the meantime apply a fix similar '
	175	. 'to the one shown at %s, in order to ensure your exception handling '
	176	. 'is saner application-wide. What follows is the actual error text '
	177	. "as generated by Perl itself:\n\n%s\n ",
9bea2000	178	$class,
841efcb3	179	$class,
	180	'http://v.gd/DBIC_overload_tempfix/',
	181	$suberror,
	182	));
	183
	184	# workaround, keeps spice flowing
	185	$not_blank = ("$e" ne '') ? 1 : 0;
	186	}
	187	else {
	188	# not blessed yet failed the 'ne'... this makes 0 sense...
	189	# just throw further
	190	die $suberror
	191	}
	192	}
	193
	194	return $not_blank;
	195	}
	196
bf302897	197	sub modver_gt_or_eq ($$) {
b1dbf716	198	my ($mod, $ver) = @_;
	199
	200	croak "Nonsensical module name supplied"
	201	if ! defined $mod or ! length $mod;
	202
	203	croak "Nonsensical minimum version supplied"
	204	if ! defined $ver or $ver =~ /[^0-9\.\_]/;
	205
052a832c	206	local $SIG{__WARN__} = sigwarn_silencer( qr/\Qisn't numeric in subroutine entry/ )
052a832c	207	if SPURIOUS_VERSION_CHECK_WARNINGS;
b1dbf716	208
56270bba	209	croak "$mod does not seem to provide a version (perhaps it never loaded)"
	210	unless $mod->VERSION;
	211
b1dbf716	212	local $@;
	213	eval { $mod->VERSION($ver) } ? 1 : 0;
	214	}
	215
a9da9b6a	216	{
	217	my $list_ctx_ok_stack_marker;
	218
e89c7968	219	sub fail_on_internal_wantarray () {
a9da9b6a	220	return if $list_ctx_ok_stack_marker;
	221
	222	if (! defined wantarray) {
	223	croak('fail_on_internal_wantarray() needs a tempvar to save the stack marker guard');
	224	}
	225
	226	my $cf = 1;
	227	while ( ( (caller($cf+1))[3] \|\| '' ) =~ / :: (?:
	228
	229	# these are public API parts that alter behavior on wantarray
	230	search \| search_related \| slice \| search_literal
	231
	232	\|
	233
	234	# these are explicitly prefixed, since we only recognize them as valid
	235	# escapes when they come from the guts of CDBICompat
	236	CDBICompat .*? :: (?: search_where \| retrieve_from_sql \| retrieve_all )
	237
	238	) $/x ) {
	239	$cf++;
	240	}
	241
e89c7968	242	my ($fr, $want, $argdesc);
	243	{
	244	package DB;
	245	$fr = [ caller($cf) ];
	246	$want = ( caller($cf-1) )[5];
	247	$argdesc = ref $DB::args[0]
	248	? DBIx::Class::_Util::refdesc($DB::args[0])
	249	: 'non '
	250	;
	251	};
	252
a9da9b6a	253	if (
e89c7968	254	$want and $fr->[0] =~ /^(?:DBIx::Class\|DBICx::)/
a9da9b6a	255	) {
a9da9b6a	256	DBIx::Class::Exception->throw( sprintf (
e89c7968	257	"Improper use of %s instance in list context at %s line %d\n\n Stacktrace starts",
e89c7968	258	$argdesc, @{$fr}[1,2]
a9da9b6a	259	), 'with_stacktrace');
	260	}
	261
	262	my $mark = [];
	263	weaken ( $list_ctx_ok_stack_marker = $mark );
	264	$mark;
	265	}
	266	}
	267
77c3a5dc	268	sub fail_on_internal_call {
	269	my ($fr, $argdesc);
	270	{
	271	package DB;
	272	$fr = [ caller(1) ];
	273	$argdesc = ref $DB::args[0]
	274	? DBIx::Class::_Util::refdesc($DB::args[0])
	275	: undef
	276	;
	277	};
	278
	279	if (
	280	$argdesc
	281	and
	282	$fr->[0] =~ /^(?:DBIx::Class\|DBICx::)/
	283	and
	284	$fr->[1] !~ /\b(?:CDBICompat\|ResultSetProxy)\b/ # no point touching there
	285	) {
	286	DBIx::Class::Exception->throw( sprintf (
	287	"Illegal internal call of indirect proxy-method %s() with argument %s: examine the last lines of the proxy method deparse below to determine what to call directly instead at %s on line %d\n\n%s\n\n Stacktrace starts",
	288	$fr->[3], $argdesc, @{$fr}[1,2], ( $fr->[6] \|\| do {
	289	require B::Deparse;
	290	no strict 'refs';
	291	B::Deparse->new->coderef2text(\&{$fr->[3]})
	292	}),
	293	), 'with_stacktrace');
	294	}
	295	}
	296
b1dbf716	297	1;