NimbostratusiRule Order Evaluation
I am changing the iRule to send all /api requests to a new pool if a flag is set, as I want to be able to simply flip a flag on or off to redirect traffic appropriately. I don't want to take the /api out of the datagroup as I want the ability to use a variable flag to flip the new pool on or off depending on what is going on.
My concern is, in the following if/else/then block will the first line evaluate true or the second? In other words, does the TCL language read through the entire block before it takes action? Or does it take action based on the first condition that matches? In both lines (the /api and $myapiflag) as well as the class match $myluri, rule is true because /api exists in both the datagroup. I want the first line to be evaluated only if the uri starts with api and the flag is set.
when HTTP_REQUEST {
set myhost [HTTP::host]
set myuri [HTTP::uri]
set myluri [string tolower $myuri]
set myapiflag 0
if { $myluri starts_with "/api" && $myapiflag } {
pool api.pool.com_8080
} elseif { [class match $myluri starts_with clients_noredirect_class]} {
pool clients.pool.com_80
} elseif { $myhost equals "" } {
if { [class match $myluri starts_with clients_noredirect_class] } {
pool app.pool.com_80
}
} else {
HTTP::redirect ""
}
}
