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=head1 NAME

fastcgi_server - external FastCGI server for RT

=head1 USAGE

    # get help
    fastcgi_server -h

    # start a server using defaults
    fastcgi_server

    # start server with custom option
    fastcgi_server --socket /path/to/socket -n 5
    fastcgi_server --port 12345 -n 5

=head1 DESCRIPTION

This is a forking external FastCGI server for RT, it can be used
with apache and other servers supporting FastCGI technology.

An advantage is lower memory usage because of sharing memory
between process. It's easier to setup this with nginx and other
servers that can not maintain pool of fastcgi servers, apache
can do this.

Disadvantage is that you have to start this server yourself and
monitor it, web servers wouldn't be able to restart it on crash.

=head1 OPTIONS

=over 4

=item -h, --help - get help

=item -n, --nprocesses - number of processes to start, by default 10

=item -s, --socket - socket path, by default F<RT/var/path/fastcgi.sock>
usually F</opt/rt3/var/fastcgi.sock>.

=item -p, --port - port to use instead of socket, by default socket is
used.

=item --pidfile - pid file path, by default F<RT/var/path/fastcgi.pid>.

=back

=head1 SERVER CONFIGURATION

=head2 nginx

Below you can find example of minimal config for nginx to run RT
with this FastCGI server. It's not ideal, but a good enough start.

    worker_processes  1;
    events { worker_connections  1024; }

    pid         /opt/rt3/var/nginx/server.pid;
    error_log   /opt/rt3/var/nginx/error.log debug;

    http {
        access_log  /opt/rt3/var/nginx/access.log;

        server {
            listen       8080;
            server_name  localhost;

            location / {
                root           /opt/rt3/share/html;
                fastcgi_pass   unix:/opt/rt3/var/fastcgi.sock;

                fastcgi_param  QUERY_STRING       $query_string;
                fastcgi_param  REQUEST_METHOD     $request_method;
                fastcgi_param  CONTENT_TYPE       $content_type;
                fastcgi_param  CONTENT_LENGTH     $content_length;
                fastcgi_param  PATH_INFO          $fastcgi_script_name;
            }

            location /NoAuth/images/ {
                alias   /opt/rt3/share/html/NoAuth/images/;
            }
        }
    }

=head1 lighttpd

Server config:

    server.name = "localhost"
    server.port = 80

    server.username  = "rt_web_user"
    server.groupname = "rt_web_group"

    server.pid-file = "/opt/rt3/var/lighthttpd/server.pid"
    server.errorlog = "/opt/rt3/var/lighthttpd/error.log"

    server.document-root = "/opt/rt3/share/html"

    server.modules = ( "mod_fastcgi" )
    fastcgi.server = (
        "/" => ((
            "socket" => "/opt/rt3/var/fastcgi.sock",
            "check-local" => "disable",
            "fix-root-scriptname" => "enable",
        ))
    )

=cut


use strict;
use warnings;
no warnings qw(once);

package RT::Interface::Web::FCGI::Server;
use base qw(FCGI::ProcManager);

package main;

use Getopt::Long;

my %opt = (
    help       => 0,
    socket     => '',
    port       => 0,
    nprocesses => 10,
    pidfile    => '',
);

GetOptions(
    'h|help!'        => \$opt{'help'},
    's|socket=s'     => \$opt{'socket'},
    'p|port=s'       => \$opt{'port'},
    'n|nprocesses=s' => \$opt{'nprocesses'},
    'pidfile=s'      => \$opt{'pidfile'},
);

if ( $opt{'help'} ) {
    require Pod::Usage;
    Pod::Usage::pod2usage(
        -message => "",
        -exitval => $opt{'help'}? 0 : 1,
        -verbose => 99,
        -sections => $opt{'help'}? 'NAME|USAGE|DESCRIPTION|OPTIONS' : 'NAME|USAGE',
    );
}

$ENV{'RT_WEBMUX_HEAVY_LOAD'} = 1;
use File::Basename;
require (dirname(__FILE__) .'/webmux.pl');

unless ( $opt{'socket'} || $opt{'port'} ) {
    require File::Spec;
    $opt{'socket'} = File::Spec->catfile($RT::VarPath, 'fastcgi.sock');
}
elsif ( $opt{'port'} ) {
    $opt{'socket'} = ':'. $opt{'port'};
}
$ENV{'FCGI_SOCKET_PATH'} = $opt{'socket'};

$opt{'pidfile'} ||= File::Spec->catfile($RT::VarPath, 'fastcgi.pid');

require CGI::Fast;

my $proc_manager = RT::Interface::Web::FCGI::Server->new({
    n_processes => $opt{'nprocesses'} || 10,
    pid_fname   => $opt{'pidfile'},
});

$proc_manager->pm_manage();

while ( my $cgi = CGI::Fast->new ) {
    $proc_manager->pm_pre_dispatch;

    $ENV{'PATH'}   = '/bin:/usr/bin';
    $ENV{'CDPATH'} = '' if defined $ENV{'CDPATH'};
    $ENV{'SHELL'}  = '/bin/sh' if defined $ENV{'SHELL'};
    $ENV{'ENV'}    = '' if defined $ENV{'ENV'};
    $ENV{'IFS'}    = '' if defined $ENV{'IFS'};

    Module::Refresh->refresh if RT->Config->Get('DevelMode');
    RT::ConnectToDatabase();

    my $interp = $RT::Mason::Handler->interp;
    if (
        !$interp->comp_exists( $cgi->path_info )
        && $interp->comp_exists( $cgi->path_info . "/index.html" )
    ) {
        $cgi->path_info( $cgi->path_info . "/index.html" );
    }

    local $@;
    eval { $RT::Mason::Handler->handle_cgi_object($cgi); };
    if ($@) {
        $RT::Logger->crit($@);
    }
    RT::Interface::Web::Handler->CleanupRequest;

    $proc_manager->pm_post_dispatch;
}

1;