init III

Perl OTRS/Kernel/cpan-lib/Net/HTTP/NB.pm

@@ -0,0 +1,121 @@
+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
+