晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/share/perl5/vendor_perl/Net/HTTP/NB.pm
package Net::HTTP::NB;
$Net::HTTP::NB::VERSION = '6.17';
use strict;
use warnings;

use base 'Net::HTTP';

sub can_read {
    return 1;
}

sub sysread {
    my $self = $_[0];
    if (${*$self}{'httpnb_read_count'}++) {
	${*$self}{'http_buf'} = ${*$self}{'httpnb_save'};
	die "Multi-read\n";
    }
    my $buf;
    my $offset = $_[3] || 0;
    my $n = sysread($self, $_[1], $_[2], $offset);
    ${*$self}{'httpnb_save'} .= substr($_[1], $offset);
    return $n;
}

sub read_response_headers {
    my $self = shift;
    ${*$self}{'httpnb_read_count'} = 0;
    ${*$self}{'httpnb_save'} = ${*$self}{'http_buf'};
    my @h = eval { $self->SUPER::read_response_headers(@_) };
    if ($@) {
	return if $@ eq "Multi-read\n";
	die;
    }
    return @h;
}

sub read_entity_body {
    my $self = shift;
    ${*$self}{'httpnb_read_count'} = 0;
    ${*$self}{'httpnb_save'} = ${*$self}{'http_buf'};
    # XXX I'm not so sure this does the correct thing in case of
    # transfer-encoding transforms
    my $n = eval { $self->SUPER::read_entity_body(@_); };
    if ($@) {
	$_[0] = "";
	return -1;
    }
    return $n;
}

1;

=pod

=encoding UTF-8

=head1 NAME

Net::HTTP::NB - Non-blocking HTTP client

=head1 VERSION

version 6.17

=head1 SYNOPSIS

 use Net::HTTP::NB;
 my $s = Net::HTTP::NB->new(Host => "www.perl.com") || die $@;
 $s->write_request(GET => "/");

 use IO::Select;
 my $sel = IO::Select->new($s);

 READ_HEADER: {
    die "Header timeout" unless $sel->can_read(10);
    my($code, $mess, %h) = $s->read_response_headers;
    redo READ_HEADER unless $code;
 }

 while (1) {
    die "Body timeout" unless $sel->can_read(10);
    my $buf;
    my $n = $s->read_entity_body($buf, 1024);
    last unless $n;
    print $buf;
 }

=head1 DESCRIPTION

Same interface as C<Net::HTTP> but it will never try multiple reads
when the read_response_headers() or read_entity_body() methods are
invoked.  This make it possible to multiplex multiple Net::HTTP::NB
using select without risk blocking.

If read_response_headers() did not see enough data to complete the
headers an empty list is returned.

If read_entity_body() did not see new entity data in its read
the value -1 is returned.

=head1 SEE ALSO

L<Net::HTTP>

=head1 AUTHOR

Gisle Aas <gisle@activestate.com>

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2001-2017 by Gisle Aas.

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

__END__

#ABSTRACT: Non-blocking HTTP client

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