add microcaching #66

.env.dist

@@ -14,6 +14,9 @@ CACHE_USER_EXPIRE=300
 CACHE_404_EXPIRE=604800
 CACHE_SEARCH_EXPIRE=432000
 
+MICROCACHING=false
+MICROCACHING_EXPIRE=5
+
 QUEUE_DELAY_PER_JOB=5
 
 THROTTLE=false

app/Console/Commands/ModifyCacheDriver.php

@@ -18,7 +18,7 @@ class ModifyCacheDriver extends Command
      *
      * @var string
      */
-    protected $description = 'Change caching driver. (redis, file)';
+    protected $description = 'Change the cache driver. [redis, file]';
 
     /**
      * Create a new command instance.
@@ -48,8 +48,8 @@ class ModifyCacheDriver extends Command
             file_put_contents($path, str_replace(
                 'CACHE_DRIVER='.env('CACHE_DRIVER'), 'CACHE_DRIVER='.$this->argument('driver'), file_get_contents($path)
             ));
+
+            $this->info("CACHE_DRIVER is now set to '{$this->argument('driver')}'");
         }
-
-
     }
 }

app/Console/Commands/ModifyCacheMethod.php

@@ -42,8 +42,6 @@ class ModifyCacheMethod extends Command
             return;
         }
 
-
-
         $path = base_path('.env');
 
         if (file_exists($path)) {
@@ -52,6 +50,6 @@ class ModifyCacheMethod extends Command
             ));
         }
 
-        $this->info("CACHE_METHOD is now set to {$this->argument('method')}");
+        $this->info("CACHE_METHOD is now set to '{$this->argument('method')}'");
     }
 }

app/Http/Middleware/EtagMiddleware.php

@@ -34,6 +34,7 @@ class EtagMiddleware
         }
 
         $fingerprint = HttpHelper::resolveRequestFingerprint($request);
+
         if (
             $request->hasHeader('If-None-Match')
             && Cache::has($fingerprint)

app/Http/Middleware/JikanResponseHandler.php

@@ -143,9 +143,16 @@ class JikanResponseHandler
         $cacheMutable = json_decode($cache, true);
         $cacheMutable = $this->cacheMutation($cacheMutable);
 
+        $response = array_merge($meta, $cacheMutable);
+
+        // Allow microcaching if it's enabled and the cache driver is set to file
+        if (env('MICROCACHING', true) && env('CACHE_DRIVER', 'file') === 'file') {
+            MicroCaching::setMicroCache($this->fingerprint, $response);
+        }
+
         return response()
             ->json(
-                array_merge($meta, $cacheMutable)
+                $response
             )
             ->setEtag(
                 md5($cache)

app/Http/Middleware/MicroCaching.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use App\Http\HttpHelper;
+use Closure;
+use Illuminate\Support\Facades\Redis;
+
+class MicroCaching
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+        if ($request->header('auth') === env('APP_KEY')) {
+            return $next($request);
+        }
+
+        // Microcaching should not work alongside redis caching
+        if (!env('MICROCACHING', false) || env('CACHE_DRIVER', 'file') === 'redis') {
+            return $next($request);
+        }
+
+        $fingerprint = "microcache:".HttpHelper::resolveRequestFingerprint($request);
+        if (app('redis')->exists($fingerprint)) {
+            return response()
+                ->json(
+                    json_decode(app('redis')->get($fingerprint), true)
+                );
+        }
+
+        return $next($request);
+    }
+
+    public static function setMicroCache($fingerprint, $cache) {
+        $fingerprint = "microcache:".$fingerprint;
+        $cache = json_encode($cache);
+
+        app('redis')->set($fingerprint, $cache);
+        app('redis')->expire($fingerprint, env('MICROCACHING_EXPIRE', 5));
+    }
+}

bootstrap/app.php

@@ -73,7 +73,8 @@ $app->routeMiddleware([
     'meta' => App\Http\Middleware\Meta::class,
     'jikan-response' => App\Http\Middleware\JikanResponseHandler::class,
     'throttle' => App\Http\Middleware\Throttle::class,
-    'etag' => \App\Http\Middleware\EtagMiddleware::class
+    'etag' => \App\Http\Middleware\EtagMiddleware::class,
+    'microcaching' => \App\Http\Middleware\MicroCaching::class
 ]);
 
 /*
@@ -122,6 +123,7 @@ $commonMiddleware = [
     'slave-auth',
     'meta',
     'etag',
+    'microcaching',
     'jikan-response',
     'throttle'
 ];