Writing a generic Irule

What I wanted is a way to have a variable available to all servers applied to a particular VIP, with a scope of that VIP. I started throwing together a code where I can use a generic maintenance page irule, although it is not how I orginally set out to accomplish it.

 

     
 class maint_home_css {     
     type string     
     filename "/var/class/maint.home.css.class"     
 }  
     
 class maint_index_html {     
     type string     
     filename "/var/class/maint.index.html.class"     
 }   
    
 class maint_logo_gif {     
    type string     
    filename "/var/class/maint.logo.gif.class"     
 }     
  
 class maint_site_desc {     
       "lists.aa.net" := "Company's Support Mailing lists"     
       "cct.aa.net"       := "CAS - Central Authentication(Dev)"     
       "login.aa.net"     := "Central Authentication Service(CAS)"     
       "forums.aa.net"      := "Company's Support Forums"     
 }     
  
 rule webserver {     
   when HTTP_REQUEST {     
        If the http_pool is down, redirect to the maintenance page     
            
       if { [active_members webct-pool] < 1 } {     
          switch [HTTP::uri] {     
                 "/"        -     
                 "/index.html" {     
                        set index_html [b64decode [string map "SITE [class lookup [HTTP::host] maint_site_desc]" [class element 0 maint_index_html]]]     
                        HTTP::respond 200 content $index_html "Content-Type" "text/html"     
                 }     
                 "/logo.gif"   { HTTP::respond 200 content [b64decode [lindex $::maint_logo_gif 0]] "Content-Type" "image/gif" }     
                 "/home.css"   { HTTP::respond 200 content [lindex $::maint_home_css 0]           "Content-Type" "text/css" }     
                 "default" { HTTP::respond 301 "Location" "/"  }     
          }     
          return     
       }     
    }     
 }