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Accessing geo-nick with Zend Framework (Zend_XmlRpc_Client)

Fri, 23/03/2007 - 14:16 — Frédéric G. Marand

Closing the tour of XML-RPC implementations usable with PHP-GTK, the shortest code to access our geo_nick service makes use a higher-level XML-RPC library: the Zend_XmlRpc_Client from the Zend Framework.

Unlike earlier implementations, Zend Framework (ZF) includes both the mashalling/unmarshalling to/from XML line format and the HTTP request/reponse process, wrapped up in a class-based mechanism using exceptions to handle errors, both at the HTTP and XML service levels (not demonstrated here).

<?php
if (!class_exists('gtk'))
  {
  die("Please load the php-gtk2 module in your php.ini\r\n");
  }

require_once('Zend/XmlRpc/Client.php');

/**
* Prepare the request data
*/
$host    = 'php-gtk.eu';
$port    = 80;
$backend = 'xmlrpc.php';

$client = new Zend_XmlRpc_Client("http://$host:$port/$backend");

$res = $client->call('gtkphpnet.geo_nick', '', 10);

/**
* and display them in a PHP-GTK2 window
*/
$window = new GtkWindow();
$window->set_title('php-gtk.eu geo-nick service');
$window->connect_simple('destroy', array('Gtk','main_quit'));
$textBuffer = new GtkTextBuffer();
$textBuffer->set_text(print_r($res, true));

$textView   = new GtkTextView();
$textView->set_buffer($textBuffer);
$textView->set_editable(false);

$window->add($textView);
$window->show_all();
Gtk::main();
?>

Of interest to PHP-GTK apps using more than one XML-RPC series of service is the notion of a server proxy available in ZF. This allows one to rewrite:

<?php
// ...
$client = new Zend_XmlRpc_Client("http://$host:$port/$backend");
$res = $client->call('gtkphpnet.geo_nick', '', 10);
?>

as :

<?php
$client = new Zend_XmlRpc_Client("http://$host:$port/$backend");
$server = $client->getProxy('gtkphpnet');
$res = $server->geo_nick('', 10);
?>

...which make XML-RPC calls almost like local calls, a bit like using a full SOAP stack without all the associated overhead.