Allow running multiplexer on web servers

modules/web/manifests/server.pp

-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'],
   }
 
@@ skipping 17 matching lines @@
     ensure => file,
     mode => 0400,
     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":
     command => "hg clone -U https://hg.adblockplus.org/${repository} /home/www/${repository}",
     path => ["/usr/bin/", "/bin/"],
@@ skipping 14 matching lines @@
     mode => 755,
   }
 
   cron {'update_repo':
     ensure => present,
     command => "hg pull -q -R /home/www/${repository} && python -m sitescripts.cms.bin.generate_static_pages /home/www/${repository} /var/www/${vhost}",
     user => www,
     minute  => '*/10',
   }
 }