Waiting room iRule

For Clarity, here is the iRule without comments;

when HTTP_REQUEST priority 1 {

set static::maxActiveClients "[class search -all -value datagroup_customer starts_with "max_active_clients"]"

set subtableName "sessionLimit"

set sessionCookieName "[class search -all -value datagroup_customer starts_with "session_cookie_prefix"]"

set holdingPage "[class search -all -value datagroup_customer starts_with "holding_page_url"]"

set need_cookie 0

if {[HTTP::cookie exists $sessionCookieName]} { set client_id [HTTP::cookie $sessionCookieName]

set sessiondata [table lookup -subtable $subtableName $client_id] if { $sessiondata != "" } {

return } }

set sessionCount [table keys -subtable $subtableName -count]

if {$sessionCount < $static::maxActiveClients} {

set need_cookie 1 set client_id [format "%08d" [expr { int(1000000000 * rand()) }]] set sessionValue [IP::client_addr]

table add -subtable $subtableName $client_id $sessionValue $static::sessionTimeout

} else {

HTTP::redirect $holdingPage } } when HTTP_RESPONSE priority 1 {