模板引擎
渲染驱动
EasySwoole引入模板渲染驱动的形式,把需要渲染的数据,通过协程客户端投递到自定义的同步进程中进行渲染并返回结果。为何要如此处理,原因在于,市面上的一些模板引擎在Swoole协程下存在变量安全问题。例如以下流程:
- request A reached, static A assign requestA-data
- compiled template
- write compiled template (yiled current coroutine)
- request B reached,static A assign requestB-data
render static A data into complied template file
以上流程我们可以发现,A请求的数据,被B给污染了。为了解决该问题,EasySwoole引入模板渲染驱动模式。
安装
composer require easyswoole/template
基础实现讲解
实现渲染引擎
use EasySwoole\Template\Config;
use EasySwoole\Template\Render;
use EasySwoole\Template\RenderInterface;
class R implements RenderInterface
{
public function render(string $template, array $data = [], array $options = []):?string
{
return 'asas';
}
public function afterRender(?string $result, string $template, array $data = [], array $options = [])
{
// TODO: Implement afterRender() method.
}
public function onException(Throwable $throwable):string
{
return $throwable->getMessage();
}
}
HTTP服务中调用
//在全局的主服务中创建事件中,实例化该Render,并注入你的驱动配置
Render::getInstance()->getConfig()->setRender(new R());
$http = new swoole_http_server("0.0.0.0", 9501);
$http->on("request", function ($request, $response)use($render) {
//调用渲染器,此时会通过携程客户端,把数据发往自定义的同步进程中处理,并得到渲染结果
$response->end(Render::getInstance()->render('a.html'));
});
$render->attachServer($http);
$http->start();
重启渲染引擎
由于某些模板引擎会缓存模板文件 导致可能出现以下情况: × 用户A请求1.tpl 返回‘a’ × 开发者修改了1.tpl的数据,改成了‘b’ × 用户B,C,D在之后的请求中,可能会出现‘a’,‘b’两种不同的值
那是因为模板引擎已经缓存了A所在进程的文件,导致后面的请求如果也分配到了A的进程,就会获取到缓存的值
解决方案如下:
1:重启easyswoole,即可解决
2:模板渲染引擎实现了重启方法restartWorker
,直接调用即可
Render::getInstance()->restartWorker();
用户可根据自己的逻辑,自行调用restartWorker
方法进行重启
例如在控制器新增reload方法:
<?php
namespace App\HttpController;
use EasySwoole\Http\AbstractInterface\Controller;
use EasySwoole\Template\Render;
class Index extends Controller
{
function index()
{
$this->response()->write(Render::getInstance()->render('index.tpl',[
'user'=>'easyswoole',
'time'=>time()
]));
}
function reload(){
Render::getInstance()->restartWorker();
$this->response()->write(1);
}
}
Smarty 渲染
引入Smarty
composer require smarty/smarty - request A reached, static A assign requestA-data
- compiled template
- write compiled template (yiled current coroutine)
- request B reached,static A assign requestB-data
- render static A data into complied template file
实现渲染引擎
use EasySwoole\Template\RenderInterface;
use EasySwoole\Template\RenderInterface;
class Smarty implements RenderInterface
{
private $smarty;
function __construct()
{
$temp = sys_get_temp_dir();
$this->smarty = new \Smarty();
$this->smarty->setTemplateDir(__DIR__.'/');
$this->smarty->setCacheDir("{$temp}/smarty/cache/");
$this->smarty->setCompileDir("{$temp}/smarty/compile/");
}
public function render(string $template, array $data = [], array $options = []): ?string
{
foreach ($data as $key => $item){
$this->smarty->assign($key,$item);
}
return $this->smarty->fetch($template,$cache_id = null, $compile_id = null, $parent = null, $display = false,
$merge_tpl_vars = true, $no_output_filter = false);
}
public function afterRender(?string $result, string $template, array $data = [], array $options = [])
{
}
public function onException(\Throwable $throwable): string
{
$msg = "{$throwable->getMessage()} at file:{$throwable->getFile()} line:{$throwable->getLine()}";
trigger_error($msg);
return $msg;
}
}
HTTP服务中调用
//在全局的主服务中创建事件中,实例化该Render,并注入你的驱动配置
Render::getInstance()->getConfig()->setRender(new Smarty());
Render::getInstance()->getConfig()->setTempDir(EASYSWOOLE_TEMP_DIR);
Render::getInstance()->attachServer(ServerManager::getInstance()->getSwooleServer());
//在action中实现响应
Render::getInstance()->render('a.html');
支持常用的模板引擎
下面列举一些常用的模板引擎包方便引入使用:
smarty/smarty
Smarty是一个使用PHP写出来的模板引擎,是目前业界最著名的PHP模板引擎之一
::: warning composer require smarty/smarty=~3.1 :::
league/plates
使用原生PHP语法的非编译型模板引擎,更低的学习成本和更高的自由度
::: warning composer require league/plates=3.* :::
duncan3dc/blade
Laravel框架使用的模板引擎
::: warning composer require duncan3dc/blade=^4.5 :::
topthink/think-template
ThinkPHP框架使用的模板引擎
::: warning composer require topthink/think-template :::