[9.x] Add cache-based maintenance mode support

src/Illuminate/Foundation/CacheBasedMaintenanceMode.php

@@ -0,0 +1,97 @@
+<?php
+
+namespace Illuminate\Foundation;
+
+use Illuminate\Contracts\Cache\Factory;
+use Illuminate\Contracts\Cache\Repository;
+use Illuminate\Contracts\Foundation\MaintenanceMode;
+
+class CacheBasedMaintenanceMode implements MaintenanceMode
+{
+    /**
+     * The cache factory.
+     *
+     * @var \Illuminate\Contracts\Cache\Factory
+     */
+    protected $cache;
+
+    /**
+     * The cache store that should be utilized.
+     *
+     * @var string
+     */
+    protected $store;
+
+    /**
+     * The cache key to use when storing maintenance mode information.
+     *
+     * @var string
+     */
+    protected $key;
+
+    /**
+     * Create a new cache based maintenance mode implementation.
+     *
+     * @param  \Illuminate\Contracts\Cache\Factory  $cache
+     * @param  string  $store
+     * @param  string  $key
+     * @return void
+     */
+    public function __construct(Factory $cache, string $store, string $key)
+    {
+        $this->cache = $cache;
+        $this->store = $store;
+        $this->key = $key;
+    }
+
+    /**
+     * Take the application down for maintenance.
+     *
+     * @param  array  $payload
+     * @return void
+     */
+    public function activate(array $payload): void
+    {
+        $this->getStore()->put($this->key, $payload);
+    }
+
+    /**
+     * Take the application out of maintenance.
+     *
+     * @return void
+     */
+    public function deactivate(): void
+    {
+        $this->getStore()->forget($this->key);
+    }
+
+    /**
+     * Determine if the application is currently down for maintenance.
+     *
+     * @return bool
+     */
+    public function active(): bool
+    {
+        return $this->getStore()->has($this->key);
+    }
+
+    /**
+     * Get the data array which was provided when the application was placed into maintenance.
+     *
+     * @return array
+     */
+    public function data(): array
+    {
+        return $this->getStore()->get($this->key);
+    }
+
+    /**
+     * Get the cache store to use.
+     *
+     * @return \Illuminate\Contracts\Cache\Repository
+     */
+    protected function getStore(): Repository
+    {
+        return $this->cache->store($this->store);
+    }
+}

src/Illuminate/Foundation/MaintenanceModeManager.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Illuminate\Foundation;
+
+use Illuminate\Support\Manager;
+
+class MaintenanceModeManager extends Manager
+{
+    /**
+     * Create an instance of the file based maintenance driver.
+     *
+     * @return \Illuminate\Foundation\FileBasedMaintenanceMode
+     */
+    protected function createFileDriver(): FileBasedMaintenanceMode
+    {
+        return new FileBasedMaintenanceMode();
+    }
+
+    /**
+     * Create an instance of the cache based maintenance driver.
+     *
+     * @return \Illuminate\Foundation\CacheBasedMaintenanceMode
+     *
+     * @throws \Illuminate\Contracts\Container\BindingResolutionException
+     */
+    protected function createCacheDriver(): CacheBasedMaintenanceMode
+    {
+        return new CacheBasedMaintenanceMode(
+            $this->container->make('cache'),
+            $this->config->get('app.maintenance.store') ?: $this->config->get('cache.default'),
+            'illuminate:foundation:down'
+        );
+    }
+
+    /**
+     * Get the default driver name.
+     *
+     * @return string
+     */
+    public function getDefaultDriver(): string
+    {
+        return $this->config->get('app.maintenance.driver', 'file');
+    }
+}

src/Illuminate/Foundation/Providers/FoundationServiceProvider.php

@@ -3,7 +3,7 @@
 namespace Illuminate\Foundation\Providers;
 
 use Illuminate\Contracts\Foundation\MaintenanceMode as MaintenanceModeContract;
-use Illuminate\Foundation\FileBasedMaintenanceMode;
+use Illuminate\Foundation\MaintenanceModeManager;
 use Illuminate\Http\Request;
 use Illuminate\Log\Events\MessageLogged;
 use Illuminate\Support\AggregateServiceProvider;
@@ -128,6 +128,11 @@ protected function registerExceptionTracking()
      */
     public function registerMaintenanceModeManager()
     {
-        $this->app->bind(MaintenanceModeContract::class, FileBasedMaintenanceMode::class);
+        $this->app->singleton(MaintenanceModeManager::class);
+
+        $this->app->bind(
+            MaintenanceModeContract::class,
+            fn () => $this->app->make(MaintenanceModeManager::class)->driver()
+        );
     }
 }

tests/Foundation/FoundationCacheBasedMaintenanceModeTest.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace Illuminate\Tests\Foundation;
+
+use Illuminate\Contracts\Cache\Factory;
+use Illuminate\Contracts\Cache\Repository;
+use Illuminate\Foundation\CacheBasedMaintenanceMode;
+use Mockery\Adapter\Phpunit\MockeryPHPUnitIntegration;
+use Mockery as m;
+use PHPUnit\Framework\TestCase;
+
+class FoundationCacheBasedMaintenanceModeTest extends TestCase
+{
+    use MockeryPHPUnitIntegration;
+
+    public function test_it_determines_whether_maintenance_mode_is_active()
+    {
+        $cache = m::mock(Factory::class, Repository::class);
+        $cache->shouldReceive('store')->with('store-key')->andReturnSelf();
+
+        $manager = new CacheBasedMaintenanceMode($cache, 'store-key', 'key');
+
+        $cache->shouldReceive('has')->once()->with('key')->andReturnFalse();
+        $this->assertFalse($manager->active());
+
+        $cache->shouldReceive('has')->once()->with('key')->andReturnTrue();
+        $this->assertTrue($manager->active());
+    }
+
+    public function test_it_retrieves_payload_from_cache()
+    {
+        $cache = m::mock(Factory::class, Repository::class);
+        $cache->shouldReceive('store')->with('store-key')->andReturnSelf();
+
+        $manager = new CacheBasedMaintenanceMode($cache, 'store-key', 'key');
+
+        $cache->shouldReceive('get')->once()->with('key')->andReturn(['payload']);
+        $this->assertSame(['payload'], $manager->data());
+    }
+
+    public function test_it_stores_payload_in_cache()
+    {
+        $cache = m::spy(Factory::class, Repository::class);
+        $cache->shouldReceive('store')->with('store-key')->andReturnSelf();
+
+        $manager = new CacheBasedMaintenanceMode($cache, 'store-key', 'key');
+        $manager->activate(['payload']);
+
+        $cache->shouldHaveReceived('put')->once()->with('key', ['payload']);
+    }
+
+    public function test_it_removes_payload_from_cache()
+    {
+        $cache = m::spy(Factory::class, Repository::class);
+        $cache->shouldReceive('store')->with('store-key')->andReturnSelf();
+
+        $manager = new CacheBasedMaintenanceMode($cache, 'store-key', 'key');
+        $manager->deactivate();
+
+        $cache->shouldHaveReceived('forget')->once()->with('key');
+    }
+}