Enable/disable the cache deletion from ENV

- By default cache is disabled

Author: mmoreram

.gitignore

@@ -1,4 +1,5 @@
 /vendor
 /var
 /composer.lock
-/.php_cs.cache
+/.php_cs.cache
+/.phpunit.result.cache

AsyncKernel.php

@@ -21,6 +21,7 @@
 use Drift\HttpKernel\DependencyInjection\CompilerPass\FilesystemCompilerPass;
 use Drift\HttpKernel\DependencyInjection\CompilerPass\PeriodicTimersCompilerPass;
 use Drift\HttpKernel\Exception\AsyncHttpKernelNeededException;
+use Drift\HttpKernel\PeriodicTimer\PeriodicTimer;
 use Exception;
 use React\Promise\PromiseInterface;
 use Symfony\Component\Filesystem\Filesystem;
@@ -46,14 +47,17 @@ public function boot()
     {
         if (!$this->booted) {
             $this->uid = $this->generateUID();
-            $fs = new Filesystem();
-            // AsyncKernel loads the container only once when it loads. Storing it in the filesystem is not for cache purposes
-            // but more for using the same loading process as Kernel class use.
-            // Hence, everytime before AsyncKernel initiates the container it deletes the cache dir,
-            // to make sure it is building the updated kernel
-            $cachePath = $this->getCacheDir();
-            if ($fs->exists($cachePath)) {
-                $fs->remove($cachePath);
+
+            if (($_ENV['DRIFT_CACHE_ENABLED'] ?? '0') !== '1') {
+                $fs = new Filesystem();
+                // AsyncKernel loads the container only once when it loads. Storing it in the filesystem is not for cache purposes
+                // but more for using the same loading process as Kernel class use.
+                // Hence, everytime before AsyncKernel initiates the container it deletes the cache dir,
+                // to make sure it is building the updated kernel
+                $cachePath = $this->getCacheDir();
+                if ($fs->exists($cachePath)) {
+                    $fs->remove($cachePath);
+                }
             }
         }
 

Tests/Base/KernelCacheTest.php

@@ -0,0 +1,44 @@
+<?php
+
+
+namespace Drift\HttpKernel\Tests\Base;
+
+use Drift\HttpKernel\Tests\AsyncKernelFunctionalTest;
+
+/**
+ * Class KernelCacheTest
+ */
+class KernelCacheTest extends AsyncKernelFunctionalTest
+{
+    public function testWithoutCache()
+    {
+        $_ENV['DRIFT_CACHE_ENABLED'] = '0';
+        static::setUpBeforeClass();
+        $cacheDir = self::$kernel->getCacheDir();
+        $firstKernelCacheCreationTime = lstat($cacheDir)['ctime'];
+        sleep(1);
+
+        static::setUpBeforeClass();
+        $cacheDir = self::$kernel->getCacheDir();
+        $secondKernelCacheCreationTime = lstat($cacheDir)['ctime'];
+
+        $this->assertGreaterThan($firstKernelCacheCreationTime, $secondKernelCacheCreationTime);
+        unset($_ENV['DRIFT_CACHE_ENABLED']);
+    }
+
+    public function testWithCache()
+    {
+        $_ENV['DRIFT_CACHE_ENABLED'] = '1';
+        static::setUpBeforeClass();
+        $cacheDir = self::$kernel->getCacheDir();
+        $firstKernelCacheCreationTime = lstat($cacheDir)['ctime'];
+        sleep(1);
+
+        static::setUpBeforeClass();
+        $cacheDir = self::$kernel->getCacheDir();
+        $secondKernelCacheCreationTime = lstat($cacheDir)['ctime'];
+
+        $this->assertEquals($firstKernelCacheCreationTime, $secondKernelCacheCreationTime);
+        unset($_ENV['DRIFT_CACHE_ENABLED']);
+    }
+}

composer.json

@@ -14,6 +14,7 @@
 
         "symfony/http-kernel": "^5.0",
         "symfony/dependency-injection": "^5.0",
+        "symfony/filesystem": "^5.0",
         "symfony/event-dispatcher-contracts": "^2.0",
         "react/promise": "^2.7",
         "react/http": "^1.0",