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.\" ========================================================================
.\"
.IX Title "CGI::Emulate::PSGI 3pm"
.TH CGI::Emulate::PSGI 3pm "2017-11-04" "perl v5.26.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
CGI::Emulate::PSGI \- PSGI adapter for CGI
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&    my $app = CGI::Emulate::PSGI\->handler(sub {
\&        # Existing CGI code
\&    });
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module allows an application designed for the \s-1CGI\s0 environment to
run in a \s-1PSGI\s0 environment, and thus on any of the backends that \s-1PSGI\s0
supports.
.PP
It works by translating the environment provided by the \s-1PSGI\s0
specification to one expected by the \s-1CGI\s0 specification. Likewise, it
captures output as it would be prepared for the \s-1CGI\s0 standard, and
translates it to the format expected for the \s-1PSGI\s0 standard using
CGI::Parse::PSGI module.
.SH "CGI.pm"
.IX Header "CGI.pm"
If your application uses \s-1CGI\s0, be sure to cleanup the global
variables in the handler loop yourself, so:
.PP
.Vb 6
\&    my $app = CGI::Emulate::PSGI\->handler(sub {
\&        use CGI;
\&        CGI::initialize_globals();
\&        my $q = CGI\->new;
\&        # ...
\&    });
.Ve
.PP
Otherwise previous request variables will be reused in the new
requests.
.PP
Alternatively, you can install and use CGI::Compile from \s-1CPAN\s0 and
compiles your existing \s-1CGI\s0 scripts into a sub that is perfectly ready
to be converted to \s-1PSGI\s0 application using this module.
.PP
.Vb 2
\&  my $sub = CGI::Compile\->compile("/path/to/script.cgi");
\&  my $app = CGI::Emulate::PSGI\->handler($sub);
.Ve
.PP
This will take care of assigning a unique namespace for each script
etc. See CGI::Compile for details.
.PP
You can also consider using \s-1CGI::PSGI\s0 but that would require you to
slightly change your code from:
.PP
.Vb 3
\&  my $q = CGI\->new;
\&  # ...
\&  print $q\->header, $output;
.Ve
.PP
into:
.PP
.Vb 1
\&  use CGI::PSGI;
\&
\&  my $app = sub {
\&      my $env = shift;
\&      my $q = CGI::PSGI\->new($env);
\&      # ...
\&      return [ $q\->psgi_header, [ $output ] ];
\&  };
.Ve
.PP
See \s-1CGI::PSGI\s0 for details.
.SH "METHODS"
.IX Header "METHODS"
.IP "handler" 4
.IX Item "handler"
.Vb 1
\&  my $app = CGI::Emulate::PSGI\->handler($code);
.Ve
.Sp
Creates a \s-1PSGI\s0 application code reference out of \s-1CGI\s0 code reference.
.IP "emulate_environment" 4
.IX Item "emulate_environment"
.Vb 1
\&  my %env = CGI::Emulate::PSGI\->emulate_environment($env);
.Ve
.Sp
Creates an environment hash out of \s-1PSGI\s0 environment hash. If your code
or framework just needs an environment variable emulation, use this
method like:
.Sp
.Vb 2
\&  local %ENV = (%ENV, CGI::Emulate::PSGI\->emulate_environment($env));
\&  # run your application
.Ve
.Sp
If you use \f(CW\*(C`handler\*(C'\fR method to create a \s-1PSGI\s0 environment hash, this
is automatically called in the created application.
.SH "AUTHOR"
.IX Header "AUTHOR"
Tokuhiro Matsuno <tokuhirom@cpan.org>
.PP
Tatsuhiko Miyagawa
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright (c) 2009\-2010 by tokuhirom.
.PP
This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.
.PP
The full text of the license can be found in the
\&\s-1LICENSE\s0 file included with this module.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1PSGI\s0 CGI::Compile \s-1CGI::PSGI\s0 Plack CGI::Parse::PSGI