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Edit File : NB.pm \| Size : 2.46 KB
package Net::HTTP::NB; our $VERSION = '6.23'; 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 6.23 =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 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 Back

Edit File : NB.pm | Size : 2.46 KB

package Net::HTTP::NB;
our $VERSION = '6.23';
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;
}

=pod

=encoding UTF-8

=head1 NAME

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

=head1 VERSION

version 6.23

=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 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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