package Net::HTTP::NB;
# $Id: NB.pm,v 1.6 2004/11/12 16:18:11 gisle Exp $
use strict;
use vars qw($VERSION @ISA);
$VERSION = "0.03";
require Net::HTTP;
@ISA=qw(Net::HTTP);
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 tranforms
my $n = eval { $self->SUPER::read_entity_body(@_); };
if ($@) {
$_[0] = "";
return -1;
}
return $n;
}
1;
__END__
=head1 NAME
Net::HTTP::NB - Non-blocking HTTP client
=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 COPYRIGHT
Copyright 2001 Gisle Aas.
This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
=cut
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