NAME

       CGI::Emulate::PSGI - PSGI adapter for CGI

SYNOPSIS

           my $app = CGI::Emulate::PSGI->handler(sub {
               # Existing CGI code
           });

DESCRIPTION

       This module allows an application designed for the CGI environment to run in a PSGI
       environment, and thus on any of the backends that PSGI supports.

       It works by translating the environment provided by the PSGI specification to one expected
       by the CGI specification. Likewise, it captures output as it would be prepared for the CGI
       standard, and translates it to the format expected for the PSGI standard using
       CGI::Parse::PSGI module.

CGI.pm

       If your application uses CGI, be sure to cleanup the global variables in the handler loop
       yourself, so:

           my $app = CGI::Emulate::PSGI->handler(sub {
               use CGI;
               CGI::initialize_globals();
               my $q = CGI->new;
               # ...
           });

       Otherwise previous request variables will be reused in the new requests.

       Alternatively, you can install and use CGI::Compile from CPAN and compiles your existing
       CGI scripts into a sub that is perfectly ready to be converted to PSGI application using
       this module.

         my $sub = CGI::Compile->compile("/path/to/script.cgi");
         my $app = CGI::Emulate::PSGI->handler($sub);

       This will take care of assigning an unique namespace for each script etc. See CGI::Compile
       for details.

       You can also consider using CGI::PSGI but that would require you to slightly change your
       code from:

         my $q = CGI->new;
         # ...
         print $q->header, $output;

       into:

         use CGI::PSGI;

         my $app = sub {
             my $env = shift;
             my $q = CGI::PSGI->new($env);
             # ...
             return [ $q->psgi_header, [ $output ] ];
         };

       See CGI::PSGI for details.

METHODS

       handler
             my $app = CGI::Emulate::PSGI->handler($code);

           Creates a PSGI application code reference out of CGI code reference.

       emulate_environment
             my %env = CGI::Emulate::PSGI->emulate_environment($env);

           Creates an environment hash out of PSGI environment hash. If your code or framework
           just needs an environment variable emulation, use this method like:

             local %ENV = (%ENV, CGI::Emulate::PSGI->emulate_environment($env));
             # run your application

           If you use "handler" method to create a PSGI environment hash, this is automatically
           called in the created application.

AUTHOR

       Tokuhiro Matsuno <tokuhirom@cpan.org>

       Tatsuhiko Miyagawa

COPYRIGHT AND LICENSE

       Copyright (c) 2009-2010 by tokuhirom.

       This program is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.

       The full text of the license can be found in the LICENSE file included with this module.

SEE ALSO

       PSGI CGI::Compile CGI::PSGI Plack CGI::Parse::PSGI