122 lines
2.5 KiB
Perl
122 lines
2.5 KiB
Perl
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package Net::HTTP::NB;
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our $VERSION = '6.18';
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use strict;
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use warnings;
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use base 'Net::HTTP';
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sub can_read {
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return 1;
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}
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sub sysread {
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my $self = $_[0];
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if (${*$self}{'httpnb_read_count'}++) {
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${*$self}{'http_buf'} = ${*$self}{'httpnb_save'};
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die "Multi-read\n";
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}
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my $buf;
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my $offset = $_[3] || 0;
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my $n = sysread($self, $_[1], $_[2], $offset);
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${*$self}{'httpnb_save'} .= substr($_[1], $offset);
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return $n;
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}
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sub read_response_headers {
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my $self = shift;
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${*$self}{'httpnb_read_count'} = 0;
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${*$self}{'httpnb_save'} = ${*$self}{'http_buf'};
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my @h = eval { $self->SUPER::read_response_headers(@_) };
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if ($@) {
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return if $@ eq "Multi-read\n";
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die;
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}
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return @h;
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}
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sub read_entity_body {
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my $self = shift;
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${*$self}{'httpnb_read_count'} = 0;
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${*$self}{'httpnb_save'} = ${*$self}{'http_buf'};
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# XXX I'm not so sure this does the correct thing in case of
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# transfer-encoding transforms
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my $n = eval { $self->SUPER::read_entity_body(@_); };
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if ($@) {
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$_[0] = "";
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return -1;
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}
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return $n;
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}
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1;
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=pod
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=encoding UTF-8
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=head1 NAME
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Net::HTTP::NB - Non-blocking HTTP client
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=head1 VERSION
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version 6.18
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=head1 SYNOPSIS
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use Net::HTTP::NB;
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my $s = Net::HTTP::NB->new(Host => "www.perl.com") || die $@;
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$s->write_request(GET => "/");
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use IO::Select;
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my $sel = IO::Select->new($s);
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READ_HEADER: {
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die "Header timeout" unless $sel->can_read(10);
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my($code, $mess, %h) = $s->read_response_headers;
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redo READ_HEADER unless $code;
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}
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while (1) {
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die "Body timeout" unless $sel->can_read(10);
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my $buf;
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my $n = $s->read_entity_body($buf, 1024);
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last unless $n;
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print $buf;
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}
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=head1 DESCRIPTION
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Same interface as C<Net::HTTP> but it will never try multiple reads
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when the read_response_headers() or read_entity_body() methods are
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invoked. This make it possible to multiplex multiple Net::HTTP::NB
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using select without risk blocking.
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If read_response_headers() did not see enough data to complete the
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headers an empty list is returned.
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If read_entity_body() did not see new entity data in its read
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the value -1 is returned.
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=head1 SEE ALSO
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L<Net::HTTP>
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=head1 AUTHOR
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Gisle Aas <gisle@activestate.com>
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=head1 COPYRIGHT AND LICENSE
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This software is copyright (c) 2001-2017 by Gisle Aas.
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This is free software; you can redistribute it and/or modify it under
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the same terms as the Perl 5 programming language system itself.
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=cut
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__END__
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#ABSTRACT: Non-blocking HTTP client
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