json rpc 是一种以json为消息格式的远程调用服务，它是一套允许运行在不同操作系统、不同环境的程序实现基于Internet过程调用的规范和一系列的实现。这种远程过程调用可以使用http作为传输协议，也可以使用其它传输协议，传输的内容是json消息体。
下面我们code一套基于PHP的rpc框架，此框架中包含rpc的服务端server，和应用端client；
（一）PHP服务端RPCserver jsonRPCServer.PHP
(二)Rpc客户端，jsonRPCClient.PHP
private $debug; private $url; // 请求id private $id; private $notification = false; /** * @param $url * @param bool $debug */ public function __construct($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; }
/** * * @param boolean $notification */ public function setRPCNotification($notification) { empty($notification) ? $this->notification = false : $this->notification = true; }
/** * @param $method * @param $params * @return bool * @throws Exception */ public function __call($method,$params) { // 检验request信息 if (!is_scalar($method)) { throw new Exception('Method name has no scalar value'); } if (is_array($params)) { $params = array_values($params); } else { throw new Exception('Params must be given as array'); }
if ($this->notification) { $currentId = NULL; } else { $currentId = $this->id; }
// 拼装成一个request请求 $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"; $opts = array ('http' => array ( 'method' => 'POST', 'header' => 'Content-type: application/json', 'content' => $request )); // 关键几部 $context = stream_context_create($opts); if ( $result = file_get_contents($this->url,false,$context)) { $response = json_decode($result,true); } else { throw new Exception('Unable to connect to '.$this->url); } // 输出调试信息 if ($this->debug) { echo nl2br(($this->debug)); } // 检验response信息 if (!$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; } } } ?>
