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 a 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 <[email protected]>

   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

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