[RFC/PATCHv2 2/2] gitweb: Add support for FastCGI, using CGI::Fast

[Jakub Narebski <jnareb@gmail.com>]

From: Sam Vilain <sam.vilain@catalyst.net.nz>

Former run() subroutine got renamed to run_request().  The new run()
subroutine can run multiple requests at once if run as FastCGI script.

To run gitweb as FastCGI script you must specify '--fastcgi' / '-f'
command line option to gitweb, otherwise it runs as an ordinary CGI
script.

[jn: cherry picked from 56d7d436644ab296155a697552ea1345f2701620
 in http://utsl.gen.nz/gitweb/?p=gitweb which was originally based
 on v264 (2326acfa95ac86a53804ca8eeeb482c2f9265e34) by Kay Sievers;
 updated to reflect current gitweb code]

TODO: update 'gitweb/README' and/or 'gitweb/INSTALL' files.

Signed-off-by: Sam Vilain <sam.vilain@catalyst.net.nz>
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
---
Changes since v1:
* Fix $pre_dispatch_hook -> $post_dispatch_hook typo.

* Leave DONE_GITWEB label in run_request() subroutine.  This way "HTTP
  exceptions" thrown using die_error(), such as '404 Not Found', would
  correctly end current request, instead of exiting FCGI script.

  Note that in original patch by Sam Vilain "HTTP exceptions" would
  not run $post_dispatch_hook.

 gitweb/gitweb.perl |   54 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 41bf992..9a3eaf5 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -1012,7 +1012,7 @@ sub dispatch {
 	$actions{$action}->();
 }
 
-sub run {
+sub run_request {
 	our $t0 = [Time::HiRes::gettimeofday()]
 		if defined $t0;
 
@@ -1036,7 +1036,57 @@ sub run {
  DONE_GITWEB:
 	1;
 }
-our $cgi = CGI->new();
+
+our $is_last_request = sub { 1 };
+our ($pre_dispatch_hook, $post_dispatch_hook, $pre_listen_hook);
+our $CGI = 'CGI';
+our $cgi;
+sub evaluate_argv {
+	return unless (@ARGV);
+
+	require Getopt::Long;
+	Getopt::Long::GetOptions(
+		'fastcgi|fcgi|f' => sub {
+			require CGI::Fast;
+			our $CGI = 'CGI::Fast';
+
+			my $request_number = 0;
+			# let each child service 100 requests
+			our $is_last_request = sub { ++$request_number > 100 };
+		},
+		'nproc|n=i' => sub {
+			my ($arg, $val) = @_;
+			return unless eval { require FCGI::ProcManager; 1; };
+			my $proc_manager = FCGI::ProcManager->new({
+				n_processes => $val,
+			});
+			our $pre_listen_hook    = sub { $proc_manager->pm_manage()        };
+			our $pre_dispatch_hook  = sub { $proc_manager->pm_pre_dispatch()  };
+			our $post_dispatch_hook = sub { $proc_manager->pm_post_dispatch() };
+		},
+	);
+}
+
+sub run {
+	evaluate_argv();
+
+	$pre_listen_hook->()
+		if $pre_listen_hook;
+
+ REQUEST:
+	while ($cgi = $CGI->new()) {
+		$pre_dispatch_hook->()
+			if $pre_dispatch_hook;
+
+		run_request();
+
+		$post_dispatch_hook->()
+			if $post_dispatch_hook;
+
+		last REQUEST if ($is_last_request->());
+	}
+}
+
 run();
 
 ## ======================================================================
-- 
1.7.0.1