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jsonRPCClient.php
/**
* The object of this class are generic jsonRPC 1.0 clients
* http://json-rpc.org/wiki/specification
*
* @author sergio
*/
class jsonRPCClient {
/**
* Debug state
*
* @var boolean
*/
private $debug;
/**
* The server URL
*
* @var string
*/
private $url;
/**
* The request id
*
* @var integer
*/
private $id;
/**
* If true, notifications are performed instead of requests
*
* @var boolean
*/
private $notification = false;
/**
* Takes the connection parameters
*
* @param string $url
* @param boolean $debug
*/
public function __construct($url,$debug = false) {
// server URL
$this->url = $url;
// proxy
empty($proxy) ? $this->proxy = '' : $this->proxy = $proxy;
// debug state
empty($debug) ? $this->debug = false : $this->debug = true;
// message id
$this->id = 1;
}
/**
* Sets the notification state of the object. In this state, notifications are performed, instead of requests.
*
* @param boolean $notification
*/
public function setRPCNotification($notification) {
empty($notification) ?
$this->notification = false
:
$this->notification = true;
}
/**
* Performs a jsonRCP request and gets the results as an array
*
* @param string $method
* @param array $params
* @return array
*/
public function __call($method,$params) {
// check
if (!is_scalar($method)) {
throw new Exception('Method name has no scalar value');
}
// check
if (is_array($params)) {
// no keys
$params = array_values($params);
} else {
throw new Exception('Params must be given as array');
}
// sets notification or request task
if ($this->notification) {
$currentId = NULL;
} else {
$currentId = $this->id;
}
// prepares the request
$request = array(
'method' => $method,
'params' => $params,
'id' => $currentId
);
$request = json_encode($request);
$this->debug && $this->debug.='***** Request *****'."\n".$request."\n".'***** End Of request *****'."\n\n";
// performs the HTTP POST
$opts = array ('http' => array (
'method' => 'POST',
'header' => 'Content-type: application/json',
'content' => $request
));
$context = stream_context_create($opts);
if ($fp = fopen($this->url, 'r', false, $context)) {
$response = '';
while($row = fgets($fp)) {
$response.= trim($row)."\n";
}
$this->debug && $this->debug.='***** Server response *****'."\n".$response.'***** End of server response *****'."\n";
$response = json_decode($response,true);
} else {
throw new Exception('Unable to connect to '.$this->url);
}
// debug output
if ($this->debug) {
echo nl2br($debug);
}
// final checks and return
if (!$this->notification) {
// check
if ($response['id'] != $currentId) {
throw new Exception('Incorrect response id (request id: '.$currentId.', response id: '.$response['id'].')');
}
if (!is_null($response['error'])) {
throw new Exception('Request error: '.$response['error']);
}
return $response['result'];
} else {
return true;
}
}
}
?>