如何在larvel 8中动态设置速率限制器

Question

I need to set the rate limiter dynamically in laravel 8 based on the combination of parameters stored in database table

S.No	Key	Param 1	Param 2	Param 3	Rate limit
1	adx	param_1_a	param_2_d	param_3_x	20
2	buz	param_1_b	param_2_u	param_3_z	30
3	cfy	param_1_c	param_2_f	param_3_y	40

and Rate limiter code will be as follows

protected function configureRateLimiting()
{
   RateLimiter::for('api', function (Request $request) {
      return [
        Limit::perMinute(rateLimit)->by(RateLimitKey)->response(function () {
        ...
        }),
        Limit::perMinute(rateLimit1)->by(RateLimitKey1)->response(function () {
        ...
        }),
      ];
   });
}

I need to add the rate limiter to the array returned in the above code

RateLimit value will be the value of the column "Rate Limit" from database table

RateLimitKey will the value with combination of the columns Key, Param 1, Param 2, Param 3 (eg, key_param1_param2_param_3)

Need to add the rate limiter dynamically using the data retrieved from the database table

I am not sure about how to proceed on adding the rate limiter in laravel 8

Answer 1

You have the request in the context, so from here it is just about getting out the data from the DB . I'm assuming they are query parameters. Remember that this can be null, and needs to have a fallback.

DB::table('rate_limiting_table')
    ->where('key', $request->query('key'))
    ->where('param_1', $request->query('param_1'))
    ->where('param_2', $request->query('param_2'))
    ->where('param_3', $request->query('param_3'))
    ->first();

Since this would be executed on each HTTP request, i would suggest caching it.

$cacheKey = $request->query('key') . $request->query('param_1') . $request->query('param_2') . $request->query('param_3');
cache()->remember($cacheKey, 14400, function () { // cached for 4 hours
    return ... // your query
});

Putting all this logic together, it could look like this. With some minor clean code improvements.

const DEFAULT_RATE_LIMITING = 60;

protected function configureRateLimiting()
{
    RateLimiter::for('global', function (Request $request) {
        $rateLimiting = $this->getCacheRateLimiting();

        return $rateLimiting ? $rateLimiting->rate_limit : static::DEFAULT_RATE_LIMITING;
    });
}

private function getRateLimitingDatabase(): ?object 
{
    DB::table('rate_limiting_table')
        ->where('key', $request->query('key'))
        ->where('param_1', $request->query('param_1'))
        ->where('param_2', $request->query('param_2'))
        ->where('param_3', $request->query('param_3'))
        ->first();
}

private function getCacheRateLimiting(): ?object 
{
    // cached for 4 hours
    return cache()->remember($this->getRateLimitingCacheKey(), 14400, function () {
        return  $this->getRateLimitingDatabase();
    });
}

private function getRateLimitingCacheKey(): string
{
    return $request->query('key')
        . $request->query('param_1')
        . $request->query('param_2')
        . $request->query('param_3');
}