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package VNDB::Util::Misc;
use strict;
use warnings;
use Exporter 'import';
use VNDB::Func;
our @EXPORT = qw|filFetchDB|;
my %filfields = (
vn => [qw|length hasani tag_inc tag_exc taginc tagexc tagspoil lang olang plat|],
release => [qw|type patch freeware doujin date_before date_after minage lang olang resolution plat med voiced ani_story ani_ero|],
);
# Arguments:
# type ('vn' or 'release'),
# filter overwrite (string or undef),
# when defined and not '', these filters will be used instead of the preferences,
# must point to a variable, will be modified in-place with the actually used filters
# options to pass to db*Get() before the filters (hashref or undef)
# these options can be overwritten by the filters or the next option
# options to pass to db*Get() after the filters (hashref or undef)
# these options overwrite all other options (pre-options and filters)
sub filFetchDB {
my($self, $type, $overwrite, $pre, $post) = @_;
$pre = {} if !$pre;
$post = {} if !$post;
my $dbfunc = $self->can($type eq 'vn' ? 'dbVNGet' : 'dbReleaseGet');
my $prefname = 'fil_'.$type;
my $pref = $self->authPref($prefname);
# simply call the DB if we're not applying filters
return $dbfunc->($self, %$pre, %$post) if !$pref && !$overwrite;
my $filters = fil_parse $overwrite || $pref, @{$filfields{$type}};
# compatibility
$self->authPref($prefname => fil_serialize $filters)
if $type eq 'vn' && _fil_vn_compat($self, $filters) && !$overwrite;
# write the definite filter string in $overwrite
$_[2] = fil_serialize({map +(
exists($post->{$_}) ? ($_ => $post->{$_}) :
exists($filters->{$_}) ? ($_ => $filters->{$_}) :
exists($pre->{$_}) ? ($_ => $pre->{$_}) : (),
), @{$filfields{$type}}}) if defined $overwrite;
return $dbfunc->($self, %$pre, %$filters, %$post) if $overwrite;
# since incorrect filters can throw a database error, we have to special-case
# filters that originate from a preference setting, so that in case these are
# the cause of an error, they are removed. Not doing this will result in VNDB
# throwing 500's even for non-browse pages. We have to do some low-level
# PostgreSQL stuff with savepoints to ensure that an error won't affect our
# existing transaction.
my $dbh = $self->{_YAWF}{DB}{sql};
$dbh->pg_savepoint('filter');
my($r, $np);
my $OK = eval {
($r, $np) = $dbfunc->($self, %$pre, %$filters, %$post);
1;
};
$dbh->pg_rollback_to('filter') if !$OK;
$dbh->pg_release('filter');
# error occured, let's try again without filters. if that succeeds we know
# it's the fault of the filter preference, and we should remove it.
if(!$OK) {
($r, $np) = $dbfunc->($self, %$pre, %$post);
# if we're here, it means the previous function didn't die() (duh!)
$self->authPref($prefname => '');
warn sprintf "Reset filter preference for userid %d. Old: %s\n", $self->authInfo->{id}||0, $pref;
}
return wantarray ? ($r, $np) : $r;
}
sub _fil_vn_compat {
my($self, $fil) = @_;
# older tag specification (by name rather than ID)
if($fil->{taginc} || $fil->{tagexc}) {
my $tagfind = sub {
return map {
my $i = $self->dbTagGet(name => $_)->[0];
$i && !$i->{meta} ? $i->{id} : ();
} grep $_, ref $_[0] ? @{$_[0]} : ($_[0]||'')
};
$fil->{tag_inc} //= [ $tagfind->(delete $fil->{taginc}) ] if $fil->{taginc};
$fil->{tag_exc} //= [ $tagfind->(delete $fil->{tagexc}) ] if $fil->{tagexc};
return 1;
}
return 0;
}
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