Limit number of connections for googlebot

Hello!

I'm trying to write an irule that limits the number of connections that Google Bot can use. I found some good scripts that help me acomplish this (one made by Joe and the other one from tips).

Here go the script. I didn't put it on production yet since I don't know the impact it will have on cpu utilization.

Hope that you guys can help me.

Here go what I was thinking. I don't know if there's a more efficient way to do this.

when RULE_INIT {
  array set ::active_clients { }
}
when CLIENT_ACCEPTED {
switch -glob [string tolower [HTTP::header "User-Agent"]] {
"*googlebot*" {
set client_ip [IP::remote_addr]
if { [info exists ::active_clients($client_ip)]  } {
if {$::active_clients($client_ip) > 10 } {
reject
log local0. "Reject GOOGLEBOT IP $client_ip ($::active_clients($client_ip))"
return
} else {
incr ::active_clients($client_ip)
}
} else {
set ::active_clients($client_ip) 1
}
}
}
}
when CLIENT_CLOSED {
switch -glob [string tolower [HTTP::header "User-Agent"]] {
"*googlebot*" {
set client_ip [IP::remote_addr]
if { [info exists ::active_clients($client_ip)] } {
incr ::active_clients($client_ip) -1
if { $::active_clients($client_ip) <= 0 } {
unset ::active_clients($client_ip)
}
}
}
}
}