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|
#########################################################################################
# Package HiPi::Utils::Config
# Description : Config File Wrapper
# Copyright : Copyright (c) 2017 Mark Dootson
# License : This is free software; you can redistribute it and/or modify it under
# the same terms as the Perl 5 programming language system itself.
#########################################################################################
package HiPi::Utils::Config;
#########################################################################################
use strict;
use warnings;
use parent qw( HiPi::Class );
use File::Path ( );
use JSON;
use Try::Tiny;
use Storable;
use Carp;
__PACKAGE__->create_ro_accessors( qw( configclass filepath default ) );
__PACKAGE__->create_accessors( qw( config _configkey ) );
our $VERSION ='0.81';
sub new {
my( $class, %userparams ) = @_;
my %params = (
configclass => 'hipi',
default => {},
);
# get user params
foreach my $key( keys (%userparams) ) {
$params{$key} = $userparams{$key};
}
$params{'_configkey'} = '';
$params{default}->{'hipi-config-version'} = $VERSION;
my $fileroot = ( $> ) ? qq($ENV{HOME}/.hipi-perl) : '/etc/hipi-perl';
my $filename = ( $> ) ? 'user.conf' : 'global.conf';
my $dirpath = qq($fileroot/$params{configclass});
File::Path::make_path($dirpath , { mode => 0700 } ) unless( -d $dirpath );
$params{filepath} = $dirpath . '/' . $filename;
my $self = $class->SUPER::new( %params );
if( -f $self->filepath ) {
$self->read_config;
# update any new defaults
my $conf = $self->config;
my $updatedefaults = 0;
for my $itemname ( keys %{ $params{default} } ) {
if( !exists( $conf->{$itemname} ) || !defined($conf->{$itemname}) ) {
$conf->{$itemname} = $params{default}->{$itemname};
$updatedefaults = 1;
}
}
$self->write_config if $updatedefaults;
} else {
$self->config( $self->default );
$self->write_config;
}
return $self;
}
sub read_config {
my $self = shift;
open ( my $fh, '<:encoding(UTF-8)', $self->filepath ) or croak( qq(failed to open config file : $!) );
read( $fh, my $input, -s $fh);
close( $fh );
my $json = JSON->new;
my $conf = try {
my $decoded = $json->decode( $input );
return $decoded;
} catch {
carp q(failed to decode configuration ) . $_;
return { config_ok => 0 };
};
$Storable::canonical = 1;
my $ckey = Storable::nfreeze( $conf );
$Storable::canonical = 0;
$self->_configkey( $ckey );
$self->config( $conf );
return 1;
}
sub write_config {
my $self = shift;
$Storable::canonical = 1;
my $ckey = Storable::nfreeze( $self->config );
$Storable::canonical = 0;
if($ckey eq $self->_configkey) {
# no need to write an unchanged config
return 1;
}
$self->config->{epoch} = time();
$ckey = Storable::nfreeze( $self->config );
$self->_configkey( $ckey );
open ( my $fh, '>:encoding(UTF-8)', $self->filepath ) or croak( qq(failed to open config file : $!) );
my $json = JSON->new;
my $output = try {
my $encoded = $json->pretty->canonical->encode( $self->config );
return $encoded;
} catch {
carp q(failed to encode configuration ) . $_;
return '';
};
if( $output ) {
print $fh $output;
}
close( $fh );
return 1;
}
sub DESTROY {
# don't call super
my $self = shift;
if( $threads::threads ) {
if( threads->tid == 0 ) {
$self->write_config;
}
} else {
$self->write_config;
}
}
1;
__END__
|
