iRule with JSESSIONID including the server id with jvmRoute

PLAN B:

Firstly, create 2 pool:

pool_web member is 10.10.10.1:80 10.10.10.2:80

pool_default is standby(its member is 20.20.20.1:80 20.20.20.2:80) when pool_web all members is down

Dynamically add elements to the array according to pool member select

# create pool_web member is  10.10.10.1:80 10.10.10.2:80
# create pool_default is standby(its member is 20.20.20.1:80 20.20.20.2:80) when pool_web all members is down

when RULE_INIT priority 500 {
    array set static::pool_array {}
}
when HTTP_RESPONSE priority 500 {
    set node_ip [IP::server_addr]
    set node_port [TCP::server_port]
    log local0. "node_ip is $node_ip, port is $node_port"
    if { [HTTP::cookie exists "JSESSIONID"] } {
        # serverID0,serverID1
        set node_x [findstr [HTTP::cookie "JSESSIONID"] "serverID" 8 1]
        log local0. "node_x is $node_x"
        # dynamic add element in array ,key is ID, value is pool member
        set static::pool_array($node_x) "$node_ip:$node_port"
        log local0. "response event pool array is [array get static::pool_array]"
    }
}
when HTTP_REQUEST priority 500 {
    if { [HTTP::cookie exists "JSESSIONID"] } {
        set server_x [findstr [HTTP::cookie "JSESSIONID"] "serverID" 8 1]
        log local0. "server_x is $server_x"
        if { [active_members pool_web] == 0 } {
            log local0. "exists cookie, select slave pool pool_default"
            pool pool_default
        } else {
            # 0 10.10.10.1:80
            # 1 10.10.10.2:80
            if { [array get static::pool_array $server_x] != "" } {
                set mem_ip [getfield [lindex [array get static::pool_array $server_x] 1] ":" 1]
                set mem_port [getfield [lindex [array get static::pool_array $server_x] 1] ":" 2]
                if { [LB::status pool pool_web member $mem_ip $mem_port] eq "up" } {
                    pool pool_web member $mem_ip $mem_port
                } else {
                    pool pool_web
                }
            } else {
                reject
                log local0. "client send fake invalid cookie JSESSIONID!"
            }
        }
    } else {
        if { [active_members pool_web] == 0 } {
            pool pool_default
            log local0. "no cookie, select slave pool pool_default"
        } else {
            pool pool_web
        }
    }
    log local0. "request event pool array is [array get static::pool_array]"
}