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- package Net::HTTP::NB;
-
- # $Id: NB.pm,v 1.5 2001/08/28 03:03:42 gisle Exp $
-
- use strict;
- use vars qw($VERSION @ISA);
-
- $VERSION = "0.02";
- 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
-