NAME

Exception::Chain - It's chained exception module

SYNOPSIS

use Exception::Chain;

eval {
    process($params);
};
if (my $e = $@) {
    if ($e->match('critical')) {
        logging($e->to_string);
        # can not connect server at get_user line [A]. dbname=user is connection failed at get_user line [B]. request_id : [X] at process line [C].
    }
    if ($e->match('critical', 'internal server error')) { # or
        send_email($e->to_string);
    }

    if (my $error_response = $e->delivery) {
        return $error_response;
    }
    else {
        return HTTP::Response->(500, 'unknown error');
    }
}

sub process {
    my ($params) = @_;
    eval {
        get_user($params->{user_id});
    };
    if (my $e = $@) {
        Exception::Chain->throw(
            error    => $e,
            tag      => 'internal server error',
            message  => sprintf('params : %s', $params->as_string),
            delivery => HTTP::Response->(500, 'internal server error'),
        );
    }
}

sub get_user {
    my ($user_id) = @_;
    eval {
        # die 'can not connect server',
    };
    if (my $e = $@) {
        Exception::Chain->throw(
            tag      => 'critical',
            message  => 'database error',
            error    => $e,
        );
    }
}

DESCRIPTION

Exception::Chain is chained exception module

METHODS

throw(%info)

store a following value.

• tag ($info{tag})

• message ($info{message})

• delivery ($info{delivery}). it's stored only once.

  throw($e); # Exception::Chain instance or message throw( tag => 'critical', message => 'connection failed', ) throw( tag => ['critical', 'database error'], message => 'connection failed', ) throw( tag => ['critical', 'database error'], message => 'connection failed', error => $@ ) throw( tag => ['critical', 'database error'], message => 'connection failed', delivery => HTTP::Response->new( 500, 'internal server error' ), )

rethrow

rethrow exception object.

to_string

chained log.

first_message

first message.

match(@tags)

matching stored tag.

delivery

delivered object. (or scalar object)

is_delivery_duplicated

(it's development tool) if delivery was duplicated, 1;

duplicated_trace

(it's development tool) description of the occured file and line.

GLOBAL VARIABLES

$Exception::Chain::SkipDepth

LICENSE

Copyright (C) Hiroyoshi Houchi.

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

AUTHOR

Hiroyoshi Houchi git@hixi-hyi.com