Profile of CGI/Emulate/PSGI.pm

Filename	/usr/share/perl5/CGI/Emulate/PSGI.pm
Statements	Executed 0 statements in 0s

Line	Calls	Time in subs	Code
1			package CGI::Emulate::PSGI;
2			use strict;
3			use warnings;
4			use CGI::Parse::PSGI;
5			use POSIX 'SEEK_SET';
6			use IO::File ();
7			use SelectSaver;
8			use Carp qw(croak);
9			use 5.008001;
10
11			our $VERSION = '0.20';
12
13			sub handler {
14			my ($class, $code, ) = @_;
15
16			return sub {
17			my $env = shift;
18
19			my $stdout = IO::File->new_tmpfile;
20
21			{
22	1	16µs	local %ENV = (%ENV, $class->emulate_environment($env)); # spent 16µs making 1 call to SelectSaver::DESTROY
23
24			local *STDIN = $env->{'psgi.input'};
25			local *STDOUT = $stdout;
26			local *STDERR = $env->{'psgi.errors'};
27
28			my $saver = SelectSaver->new("::STDOUT");
29			$code->();
30			}
31
32			seek( $stdout, 0, SEEK_SET )
33			or croak("Can't seek stdout handle: $!");
34
35			return CGI::Parse::PSGI::parse_cgi_output($stdout);
36			};
37			}
38
39			sub emulate_environment {
40			my($class, $env) = @_;
41
42			no warnings;
43			my $environment = {
44			GATEWAY_INTERFACE => 'CGI/1.1',
45			HTTPS => ( ( $env->{'psgi.url_scheme'} eq 'https' ) ? 'ON' : 'OFF' ),
46			SERVER_SOFTWARE => "CGI-Emulate-PSGI",
47			REMOTE_ADDR => '127.0.0.1',
48			REMOTE_HOST => 'localhost',
49			REMOTE_PORT => int( rand(64000) + 1000 ), # not in RFC 3875
50			# REQUEST_URI => $uri->path_query, # not in RFC 3875
51			( map { $_ => $env->{$_} } grep !/^psgix?\./, keys %$env )
52			};
53
54			return wantarray ? %$environment : $environment;
55			}
56
57			1;
58			__END__
59
60			=head1 NAME
61
62			CGI::Emulate::PSGI - PSGI adapter for CGI
63
64			=head1 SYNOPSIS
65
66			my $app = CGI::Emulate::PSGI->handler(sub {
67			# Existing CGI code
68			});
69
70			=head1 DESCRIPTION
71
72			This module allows an application designed for the CGI environment to
73			run in a PSGI environment, and thus on any of the backends that PSGI
74			supports.
75
76			It works by translating the environment provided by the PSGI
77			specification to one expected by the CGI specification. Likewise, it
78			captures output as it would be prepared for the CGI standard, and
79			translates it to the format expected for the PSGI standard using
80			L<CGI::Parse::PSGI> module.
81
82			=head1 CGI.pm
83
84			If your application uses L<CGI>, be sure to cleanup the global
85			variables in the handler loop yourself, so:
86
87			my $app = CGI::Emulate::PSGI->handler(sub {
88			use CGI;
89			CGI::initialize_globals();
90			my $q = CGI->new;
91			# ...
92			});
93
94			Otherwise previous request variables will be reused in the new
95			requests.
96
97			Alternatively, you can install and use L<CGI::Compile> from CPAN and
98			compiles your existing CGI scripts into a sub that is perfectly ready
99			to be converted to PSGI application using this module.
100
101			my $sub = CGI::Compile->compile("/path/to/script.cgi");
102			my $app = CGI::Emulate::PSGI->handler($sub);
103
104			This will take care of assigning a unique namespace for each script
105			etc. See L<CGI::Compile> for details.
106
107			You can also consider using L<CGI::PSGI> but that would require you to
108			slightly change your code from:
109
110			my $q = CGI->new;
111			# ...
112			print $q->header, $output;
113
114			into:
115
116			use CGI::PSGI;
117
118			my $app = sub {
119			my $env = shift;
120			my $q = CGI::PSGI->new($env);
121			# ...
122			return [ $q->psgi_header, [ $output ] ];
123			};
124
125			See L<CGI::PSGI> for details.
126
127			=head1 METHODS
128
129			=over 4
130
131			=item handler
132
133			my $app = CGI::Emulate::PSGI->handler($code);
134
135			Creates a PSGI application code reference out of CGI code reference.
136
137			=item emulate_environment
138
139			my %env = CGI::Emulate::PSGI->emulate_environment($env);
140
141			Creates an environment hash out of PSGI environment hash. If your code
142			or framework just needs an environment variable emulation, use this
143			method like:
144
145			local %ENV = (%ENV, CGI::Emulate::PSGI->emulate_environment($env));
146			# run your application
147
148			If you use C<handler> method to create a PSGI environment hash, this
149			is automatically called in the created application.
150
151			=back
152
153			=head1 AUTHOR
154
155			Tokuhiro Matsuno <tokuhirom@cpan.org>
156
157			Tatsuhiko Miyagawa
158
159			=head1 COPYRIGHT AND LICENSE
160
161			Copyright (c) 2009-2010 by tokuhirom.
162
163			This program is free software; you can redistribute
164			it and/or modify it under the same terms as Perl itself.
165
166			The full text of the license can be found in the
167			LICENSE file included with this module.
168
169			=head1 SEE ALSO
170
171			L<PSGI> L<CGI::Compile> L<CGI::PSGI> L<Plack> L<CGI::Parse::PSGI>
172
173			=cut
174