Tech Tip: Using the RESTful Control API with Perl - listpoolnodes

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The following code uses Stingray's RESTful API to list all the pools defined for a cluster and for each pool it lists the nodes defined for that pool, including draining and disabled nodes. The code is written in Perl. This example builds on the previous listpools.pl example. This program does a GET request for the list of pool and then while looping through the list of pools, a GET is done for each pool to retrieve the configuration parameters for that pool.

listpoolnodes.pl

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#!/usr/bin/perl use REST::Client; use MIME::Base64; use JSON; print "Pools:\n\n"; # Since Stingray is using a self-signed certificate we don't need to verify it $ENV{'PERL_LWP_SSL_VERIFY_HOSTNAME'} = 0; my $url = "/api/tm/1.0/config/active/pools"; # Set up the connection my $client = REST::Client->new(); $client->setHost("https://stingray.example.com:9070"); $client->addHeader("Authorization", "Basic " . encode_base64("admin:admin")); # Request a list of pools $client->GET($url); # Decode the json response my $response = decode_json($client->responseContent()); if ($client->responseCode() == 200) {     # Obtain a reference to the children array     my $poolArrayRef = $response->{children};     foreach my $pool (@$poolArrayRef) {         my $poolName = $pool->{name};         $client->GET("$url/$poolName");         my $poolConfig = decode_json $client->responseContent();         if ($client->responseCode() == 200) {             my $nodes = $poolConfig->{properties}->{basic}->{nodes};             my $draining = $poolConfig->{properties}->{basic}->{draining};             my $disabled = $poolConfig->{properties}->{basic}->{disabled};             print "Pool: $poolName\n";             print "    Nodes: ";             foreach my $node (@$nodes) {                 print "$node ";             }             print "\n";             if (scalar(@$draining) gt 0) {                 print "    Draining Nodes: ";                 foreach my $node (@$draining) {                     print "$node ";                 }                 print "\n";             }             if (scalar(@$disabled) gt 0) {                 print "    Diabled Nodes: ";                 foreach my $node (@$disabled) {                     print "$node ";                 }                 print "\n";             }             print "\n";         } else {             print "Error getting pool config: status=" . $client->responseCode() . " Id=" . $poolConfig->{error_id} . ": " . $poolConfig->{error_text} . "\n"         }     } } else {     print "Error getting list of pools: status=" . $client->responseCode() . " Id=" . $response->{error_id} . ": " . $response->{error_text} . "\n"; }

Running the example

This code was tested with Perl 5.14.2 and version 249 of the REST::Client module.

Run the Perl script as follows:

$ listpoolnodes.pl

Pools:

Pool1

    Nodes:  192.168.1.100 192.168.1.101

    Draining:  192.168.1.101

    Disabled:  192.168.1.102

Pool2

    Nodes:  192.168.1.103 192.168.1.104


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Read More

• Stingray REST API Guide in the Stingray Product Documentation
• Feature Brief: Stingray's RESTful Control API
• Tech Tip: Using Stingray's RESTful Control API
• Tech Tip: Using the RESTful Control API with Perl
• Collected Tech Tips: Using the RESTful Control API