Allow running multiplexer on web servers

modules/web/manifests/server.pp

Index: modules/web/manifests/server.pp
===================================================================
--- a/modules/web/manifests/server.pp
+++ b/modules/web/manifests/server.pp
@@ -1,9 +1,9 @@
-class web::server($vhost, $repository) {
+class web::server($vhost, $repository, $multiplexer_locations = undef) {
   File {
     owner  => 'root',
     group  => 'root',
     mode   => 0644,
   }
 
   Cron {
     environment => ['MAILTO=admin@adblockplus.org', 'PYTHONPATH=/opt/sitescripts'],
@@ -31,16 +31,35 @@ class web::server($vhost, $repository) {
     require => Nginx::Hostconfig[$vhost],
     source => 'puppet:///modules/private/adblockplus.org_sslcert.pem',
   }
 
   class {'sitescripts':
     sitescriptsini_source => 'puppet:///modules/web/sitescripts',
   }
 
+  if $multiplexer_locations != undef {
+    include spawn-fcgi
+    package {['python-flup', 'python-mysqldb']:}
+
+    spawn-fcgi::pool {"multiplexer":
+      ensure => present,
+      fcgi_app => '/opt/sitescripts/multiplexer.fcgi',
+      socket => '/tmp/multiplexer-fastcgi.sock',
+      mode => '0666',
+      user => 'nginx',
+      children => 1,
+      require => [
+        Exec["fetch_sitescripts"],
+        Package["python-flup"],
+        Package["python-mysqldb"],
+      ],
+    }
+  }
+
   user {'www':
     ensure => present,
     comment => 'Web content owner',
     home => '/home/www',
     managehome => true,
   }
 
   exec {"fetch_repo":