package Sisimai::Reason::TooManyConn;
use feature ':5.10';
use strict;
use warnings;

sub text  { 'toomanyconn' }
sub description { 'SMTP connection rejected temporarily due to too many concurrency connections to the remote host' }
sub match {
    # Try to match that the given text and regular expressions
    # @param    [String] argv1  String to be matched with regular expressions
    # @return   [Integer]       0: Did not match
    #                           1: Matched
    # @since v4.1.26
    my $class = shift;
    my $argv1 = shift // return undef;
    my $regex = qr{(?>
         all[ ]available[ ]ips[ ]are[ ]at[ ]maximum[ ]connection[ ]limit    # SendGrid
        |connection[ ]rate[ ]limit[ ]exceeded
        |domain[ ].+[ ]has[ ]exceeded[ ]the[ ]max[ ]emails[ ]per[ ]hour[ ].+[ ]allowed
        |no[ ]ips[ ]available[ ][-][ ].+[ ]exceeds[ ]per[-]domain[ ]connection[ ]limit[ ]for
        |throttling[ ]failure:[ ](?:
             daily[ ]message[ ]quota[ ]exceeded
            |maximum[ ]sending[ ]rate[ ]exceeded
            )
        |too[ ]many[ ](?:
             connections
            |connections[ ]from[ ]your[ ]host[.]    # Microsoft
            |concurrent[ ]smtp[ ]connections        # Microsoft
            |errors[ ]from[ ]your[ ]ip              # Free.fr
            |smtp[ ]sessions[ ]for[ ]this[ ]host    # Sendmail(daemon.c)
            )
        |trop[ ]de[ ]connexions,[ ].+[a-z]{3}.+104
        |we[ ]have[ ]already[ ]made[ ]numerous[ ]attempts[ ]to[ ]deliver[ ]this[ ]message
        )
    }x;

    return 1 if $argv1 =~ $regex;
    return 0;
}

sub true {
    # Blocked due to that connection rate limit exceeded
    # @param    [Sisimai::Data] argvs   Object to be detected the reason
    # @return   [Integer]               1: Too many connections(blocked)
    #                                   0: Not many connections
    # @since v4.1.26
    # @see http://www.ietf.org/rfc/rfc2822.txt
    my $class = shift;
    my $argvs = shift // return undef;

    return undef unless ref $argvs eq 'Sisimai::Data';
    return 1 if $argvs->reason eq 'toomanyconn';

    require Sisimai::SMTP::Status;
    return 1 if Sisimai::SMTP::Status->name($argvs->deliverystatus) eq 'toomanyconn';
    return 1 if __PACKAGE__->match(lc $argvs->diagnosticcode);
    return 0;
}

1;
__END__

=encoding utf-8

=head1 NAME

Sisimai::Reason::TooManyConn - Bounced due to that too many connections.

=head1 SYNOPSIS

    use Sisimai::Reason::TooManyConn;
    print Sisimai::Reason::TooManyConn->match('Connection rate limit exceeded');    # 1

=head1 DESCRIPTION

Sisimai::Reason::TooManyConn checks the bounce reason is C<toomanyconn> or not.
This class is called only Sisimai::Reason class.

This is the error that SMTP connection was rejected temporarily due to too many
concurrency connections to the remote server. This reason has added in Sisimai
4.1.26 and does not exist in any version of bounceHammer.

    <kijitora@example.ne.jp>: host mx02.example.ne.jp[192.0.1.20] said:
        452 4.3.2 Connection rate limit exceeded. (in reply to MAIL FROM command)

=head1 CLASS METHODS

=head2 C<B<text()>>

C<text()> returns string: C<toomanyconn>.

    print Sisimai::Reason::TooManyConn->text;  # toomanyconn

=head2 C<B<match(I<string>)>>

C<match()> returns 1 if the argument matched with patterns defined in this class.

    print Sisimai::Reason::TooManyConn->match('Connection rate limit exceeded');  # 1

=head2 C<B<true(I<Sisimai::Data>)>>

C<true()> returns 1 if the bounce reason is C<toomanyconn>. The argument must be
Sisimai::Data object and this method is called only from Sisimai::Reason class.

=head1 AUTHOR

azumakuniyuki

=head1 COPYRIGHT

Copyright (C) 2014-2018 azumakuniyuki, All rights reserved.

=head1 LICENSE

This software is distributed under The BSD 2-Clause License.

=cut

