首页 / 网页编程 / PHP / php实现的一个简单json rpc框架实例
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
复制代码 代码如下:
class jsonRPCServer {
/**
*处理一个request类,这个类中绑定了一些请求参数
* @param object $object
* @return boolean
*/
public static function handle($object) {
// 判断是否是一个rpc json请求
if ($_SERVER["REQUEST_METHOD"] != "POST" || empty($_SERVER["CONTENT_TYPE"])
||$_SERVER["CONTENT_TYPE"] != "application/json") {
return false;
}
// reads the input data
$request = json_decode(file_get_contents("php://input"),true);
// 执行请求类中的接口
try {
if ($result = @call_user_func_array(array($object,$request["method"]),$request["params"])) {
$response = array ( "id"=> $request["id"],"result"=> $result,"error"=> NULL );
} else {
$response = array ( "id"=> $request["id"], "result"=> NULL,
"error" => "unknown method or incorrect parameters" );}
} catch (Exception $e) {
$response = array ("id" => $request["id"],"result" => NULL, "error" =>$e->getMessage());
}
// json 格式输出
if (!empty($request["id"])) { // notifications don"t want response
header("content-type: text/javascript");
echo json_encode($response);
}
return true;
}
}
(二)Rpc客户端,jsonRPCClient.php
复制代码 代码如下:
<?php
/*
*/
class jsonRPCClient {
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 && $this->debug.="***** Request *****"."
".$request."
"."***** End Of request *****"."
";
$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;
}
}
}
?>
(三) 应用实例
(1)服务端 server.php
复制代码 代码如下:
<?php
require_once "jsonRPCServer.php";
复制代码 代码如下:
// member 为测试类
require "member.php";
// 服务端调用
$myExample = new member();
// 注入实例
jsonRPCServer::handle($myExample)
or print "no request";
?>
(2)测试类文件,member.php
复制代码 代码如下:
class member{
public function getName(){
return "hello word " ; // 返回字符串
}
}
(3)客户端 client.php
复制代码 代码如下:
require_once "jsonRPCClient.php";
$url = "http://localhost/rpc/server.php";
$myExample = new jsonRPCClient($url);
// 客户端调用
try {
$name = $myExample->getName();
echo $name ;
} catch (Exception $e) {
echo nl2br($e->getMessage())."<br />"."
";
}