Brocade Virtual ADX OpenScript Programmer’s Guide (Support Manuale Utente Scaricare il pdf (Pagina 18)

10 Brocade Virtual ADX OpenScript Programmer’s Guide

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Sample scripts

The following examples provide two different approaches to creating a script for the same purpose.

The first example provides a heavily commented example for high readability and the second is a

“power-user” version of the script. It is much more compact with less extensive notation. Both

scripts provide for load-balancing using a URL match in an HTTP GET request.

High readability script example

The following example provides a version of the script that demonstrates high-readability.

# Elegant load balancer with good readability

# Performs server selection based on URI in HTTP

# Request Header

# Tell the script about extensions used in this program

use OS_HTTP_Request;

use OS_SLB;

use strict;

use Sub::StrictDecl;

sub HTTP_REQUEST

{

#Get an HTTP request object to manage

# request headers or content.

# Pattern we want to match…..

$url_pattern = "index.html";

# …. with pattern data in packet

$url_in_request = OS_HTTP_REQUEST::url;

# Perform a Regular Expression Search.

if ($url_in_request =~ m/$uri_pattern/) {

# Forward to a real server identified by name

OS_SLB::forward("RS1");

} else {

# Forward to a real-server group identified by numeric ID

OS_SLB::forward(2);

}

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Brocade Virtual ADX OpenScript Programmer’s Guide (Support Manuale Utente Pagina 18