File Coverage

blib/lib/Yukki/Error.pm

Criterion	Covered	Total	%
statement	20	42	47.6
branch			n/a
condition	0	4	0.0
subroutine	7	15	46.6
pod	4	8	50.0
total	31	69	44.9

package Yukki::Error;
$Yukki::Error::VERSION = '0.99_01'; # TRIAL

$Yukki::Error::VERSION = '0.9901';use v5.24;
use utf8;
use Moo;

extends qw( HTTP::Throwable::Factory );

use Yukki::Web::View;

use namespace::clean;

use Sub::Exporter -setup => {
    exports => [ qw< http_throw http_exception > ],
};

# ABSTRACT: Yukki's exception class


sub base_class { 'Yukki::Error' }
sub extra_roles { 'Yukki::Error::Body' }


sub http_exception {
    my ($name, $args) = @_;

    my %args = %{ $args // {} };
    my $status = delete $args{status} // 'InternalServerError';

    Yukki::Error->new_exception($status => {
        %args,
        message => "$name",
    });
}


sub http_throw {
    my ($name, $args) = @_;

    http_exception($name, $args)->throw;
}

sub BUILDARGS {
    my ($class, $args) = @_;
    $args;
}


{
    package Yukki::Error::Body;
$Yukki::Error::Body::VERSION = '0.99_01'; # TRIAL

$Yukki::Error::Body::VERSION = '0.9901';use Moo::Role;


    sub body {
        my ($self, $env) = @_;

        my $app  = $env->{'yukki.app'};
        my $view = Yukki::Web::View->new(app => $app);
        my $ctx  = Yukki::Web::Context->new(env => $env);

        my $template = $view->prepare_template(
            template   => 'error.html',
            directives => [
                '#error-page' => 'error_message',
            ],
        );

        $ctx->response->page_title($self->reason);

        return $view->render_page(
            template => $template,
            context  => $ctx,
            vars     => {
                'error_message' => $self->message,
            },
        );
    }


    sub body_headers {
        my ($self, $body) = @_;

        return [
            'Content-type'   => 'text/html',
            'Content-length' => length $body,
        ];
    }


    sub as_string {
        my $self = shift;
        return $self->message;
    }

    around as_psgi => sub {
        shift; # original method is ignored
        my ($self, $env) = @_;
        my $body    = $self->body( $env );
        my $headers = $self->build_headers( $body );
        [ $self->status_code, $headers, [ defined $body ? $body : () ] ];
    };

}

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

Yukki::Error - Yukki's exception class

=head1 VERSION

version 0.99_01

=head1 SYNOPSIS

  Yukki::Error->throw("Something really bad.", { ... });

=head1 DESCRIPTION

If you are familiar with L<HTTP::Throwable::Factory>, this is similar to that (and is based on that).

However, there are two differences. First, the error message is given primacy rather than exception type, so you can just use this to throw an exception:

    use Yukki::Error qw( http_throw );
    http_throw('something went wrong');

Since you almost always want your exception to be an internal server error of some kind, this makes more sense to me than having to write:

    use HTTP::Throwable::Factory qw( http_throw );
    http_throw(InternalServerError => {
        message => 'something went wrong',
    });

To specify the type of exception, us C<status>:

    use Yukki::Error qw( http_throw );
    http_throw('something was not found', {
        status => 'NotFound',
    });

The second difference is that all exceptions thrown by this factory inherit from L<Yukki::Error>, so this works:

    use Scalar::Util qw( blessed );
    use Try::Tiny;
    try { ... }
    catch {
        if (blassed $_ && $_->isa("Yukki::Error") {
            # we now this is an application error from Yukki
        }
    };

This makes it easy to know whether Yukki generated the exception or something else did.

=head1 EXPORTS

=head2 http_exception

  my $error = http_exception('message', {
      status           => 'InternalServerError',
      show_stask_trace => 0,
  });

Creates a new exception object. Calls the constructor for L<Yukki:Error> and applied the L<HTTP::Throwable> status role needed (prior to construction actually).

=head2 http_throw

  http_throw('message', {
      status           => 'InternalServerError',
      show_stask_trace => 0,
  });

Constructs the exception (via L</http_exception>) and throws it.

=for Pod::Coverage     BUILDARGS
    base_class
    extra_roles

=head1 METHODS

=head2 body

Renders the HTML body for the error.

=head2 body_headers

Setup the HTTP headers.

=head2 as_string

Returns the message.

=head1 AUTHOR

Andrew Sterling Hanenkamp <[e-mail]>

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2017 by Qubling Software LLC.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut