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# $Id: Ruleset.pm,v 1.6 2007/08/14 15:45:51 ajk Exp $ |
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use strict; |
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use warnings; |
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package Data::Passphrase::Ruleset; { |
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use Object::InsideOut; |
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use Data::Passphrase::Rule; |
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use Carp; |
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# object attributes |
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my @debug :Field( Std => 'debug', Type => 'Numeric' ); |
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my @file :Field( Get => 'get_file', ); |
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my @passing_score :Field( Std => 'passing_score', Type => 'Numeric' ); |
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my @rules :Field( Get => 'get_rules', ); |
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my %init_args :InitArgs = ( |
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debug => { |
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Def => 0, |
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Field => \@debug, |
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Type => 'Numeric', |
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}, |
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file => { |
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Field => \@file, |
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Pre => \&preprocess, |
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}, |
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passing_score => { |
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Def => 0.6, |
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Field => \@passing_score, |
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Type => 'Numeric', |
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}, |
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rules => { |
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Field => \@rules, |
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Pre => \&preprocess, |
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Type => 'Array_ref', |
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}, |
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); |
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sub preprocess { |
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my ($class, $name, $init_ref, $self, $value) = @_; |
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# file & rules attributes are mutually exclusive |
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if (defined $value) { |
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croak 'file & rules cannot be supplied simultaneously' |
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if $name eq 'file' && defined $self->get_rules() |
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|| $name eq 'rules' && defined $self->get_file (); |
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} |
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return $value; |
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} |
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# overload constructor so we can automatically load the rules file |
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sub new { |
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my ($class, $arg_ref) = @_; |
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# unpack arguments |
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my $debug = $arg_ref->{debug}; |
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$debug and warn 'initializing ', __PACKAGE__, ' object'; |
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# construct object |
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my $self = $class->Object::InsideOut::new($arg_ref); |
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# load rules from file |
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if (exists $arg_ref->{file}) { |
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$self->load(); |
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} |
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return $self; |
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} |
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# cache rulesets by filename |
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my %Rules_Cache; |
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# load the rules file if we need to |
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sub load { |
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my ($self) = @_; |
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# unpack arguments |
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my $debug = $self->get_debug(); |
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my $file = $self->get_file () or croak 'file attribute undefined'; |
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$debug and warn "$file: checking readability"; |
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my $last_modified = 0; |
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if (-r $file) { |
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# point the object attribute at the current ruleset |
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$Rules_Cache{$file}{rules} ||= []; |
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$self->set(\@rules, $Rules_Cache{$file}{rules}); |
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# don't re-read if file hasn't been modified since last time |
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$last_modified = (stat _)[9]; |
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$debug and warn "$file: pid: $$, mod time: $last_modified, ", |
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"last processed: ", $Rules_Cache{$file}{last_read}; |
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return if exists $Rules_Cache{$file}{last_read} |
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&& $Rules_Cache{$file}{last_read} == $last_modified; |
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# read the configuration file |
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$debug and warn "$file: processing"; |
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my $rule_list = do $file; |
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if (ref $rule_list ne 'ARRAY') { |
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croak "$file: parse error: $@" if $@; |
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croak "$file: $!" if $!; |
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croak "$file: must return a reference to an array of rules"; |
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} |
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push @{ $Rules_Cache{$file}{rules} }, map { |
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ref eq 'HASH' |
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? Data::Passphrase::Rule->new( |
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{ %$_, debug => $debug } |
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) |
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: $_ |
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; |
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} @$rule_list; |
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} |
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# limp along if the file went away, unless this is the first run |
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else { |
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warn "$file: $!"; |
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die if !exists $Rules_Cache{$file}{last_read}; |
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} |
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# cache the timestamp for comparison in later calls |
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$Rules_Cache{$file}{last_read} = $last_modified; |
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} |
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# load the file after setting the file attribute |
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sub set_file { |
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my ($self, $value) = @_; |
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my $return_value = $self->set(\@file, $value); |
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if (defined $value) { |
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$self->load(); |
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} |
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return $return_value; |
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} |
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# clear file attribute if rules are loaded directly |
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sub set_rules { |
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my ($self, $value) = @_; |
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# check type |
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croak 'rules attribute may only be set to an array reference' |
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if ref $value ne 'ARRAY'; |
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my $return_value = $self->set(\@rules, $value); |
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$self->set_file(); |
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return $return_value; |
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} |
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} |
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1; |
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__END__ |