让Lumen支持请求控制

  1. 1. 从 Laravel 移植
  2. 2. 注册中间件
  3. 3. 更新 composer
  4. 4. 测试

Lumen 是你构建微服务架构和 API 应用的完美解决方案,事实上,她是全宇宙最快的框架之一,甚至要快过以速度著称的 SilexSlim,现在,为你的 Laravel 应用程序编写微服务架构变得再简单不过了。

但是你在使用的过程中,你会发现很多 Laravel 中好用的功能都被精简了,比如说请求控制中间件 Throttle。这个中间件能简单的实现请求控制。那么接下来跟我一起为 Lumen 重新添加这么好用的功能吧。

从 Laravel 移植

GitHub地址:https://github.com/laravel/framework/blob/5.2/src/Illuminate/Routing/Middleware/ThrottleRequests.php

保存为 app/Http/Middleware/ThrottleRequests.php,别忘了修改 namespaceApp\Http\Middleware,完整代码如下:

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<?php
namespace App\Http\Middleware;

use Closure;
use Illuminate\Cache\RateLimiter;
use Symfony\Component\HttpFoundation\Response;

class ThrottleRequests
{
/**
* The rate limiter instance.
*
* @var \Illuminate\Cache\RateLimiter
*/
protected $limiter;

/**
* Create a new request throttler.
*
* @param \Illuminate\Cache\RateLimiter $limiter
* @return void
*/
public function __construct(RateLimiter $limiter)
{
$this->limiter = $limiter;
}

/**
* Handle an incoming request.
*
* @param \Illuminate\Http\Request $request
* @param \Closure $next
* @param int $maxAttempts
* @param int $decayMinutes
* @return mixed
*/
public function handle($request, Closure $next, $maxAttempts = 60, $decayMinutes = 1)
{
$key = $this->resolveRequestSignature($request);

if ($this->limiter->tooManyAttempts($key, $maxAttempts, $decayMinutes)) {
return $this->buildResponse($key, $maxAttempts);
}

$this->limiter->hit($key, $decayMinutes);

$response = $next($request);

return $this->addHeaders(
$response, $maxAttempts,
$this->calculateRemainingAttempts($key, $maxAttempts)
);
}

/**
* Resolve request signature.
*
* @param \Illuminate\Http\Request $request
* @return string
*/
protected function resolveRequestSignature($request)
{
// return $request->fingerprint();
// Lumen 版本缺少 Request::fingerprint 方法
return sha1(
$request->method() .
'|' . $request->server('SERVER_NAME') .
'|' . $request->path() .
'|' . $request->ip()
);
}

/**
* Create a 'too many attempts' response.
*
* @param string $key
* @param int $maxAttempts
* @return \Illuminate\Http\Response
*/
protected function buildResponse($key, $maxAttempts)
{
$response = new Response('Too Many Attempts.', 429);

$retryAfter = $this->limiter->availableIn($key);

return $this->addHeaders(
$response, $maxAttempts,
$this->calculateRemainingAttempts($key, $maxAttempts, $retryAfter),
$retryAfter
);
}

/**
* Add the limit header information to the given response.
*
* @param \Symfony\Component\HttpFoundation\Response $response
* @param int $maxAttempts
* @param int $remainingAttempts
* @param int|null $retryAfter
* @return \Illuminate\Http\Response
*/
protected function addHeaders(Response $response, $maxAttempts, $remainingAttempts, $retryAfter = null)
{
$headers = [
'X-RateLimit-Limit' => $maxAttempts,
'X-RateLimit-Remaining' => $remainingAttempts,
];

if (!is_null($retryAfter)) {
$headers['Retry-After'] = $retryAfter;
}

$response->headers->add($headers);

return $response;
}

/**
* Calculate the number of remaining attempts.
*
* @param string $key
* @param int $maxAttempts
* @param int|null $retryAfter
* @return int
*/
protected function calculateRemainingAttempts($key, $maxAttempts, $retryAfter = null)
{
if (!is_null($retryAfter)) {
return 0;
}

return $this->limiter->retriesLeft($key, $maxAttempts);
}
}

注册中间件

找到 bootstrap/app.php 文件,添加:

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$app->routeMiddleware([
'throttle' => App\Http\Middleware\ThrottleRequests::class,
]);

更新 composer

1
composer dump-autoload

测试

找到 routes/web.php,修改 or 添加

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// 默认速率是60请求/分钟
$router->group(['prefix' => 'api', 'middleware'=>'throttle'], function () use ($router) {
$router->get('/', function () {
return $router->app->version();
});
});
// 自定义速率是2请求/分钟
$router->group(['prefix' => 'home', 'middleware'=>'throttle:2,1'], function () use ($router) {
$router->get('/', function () {
return $router->app->version();
});
});