Support some cases of blue/green deployment

Author: kandy

app/code/Magento/Deploy/Model/Plugin/ConfigChangeDetector.php

@@ -7,6 +7,7 @@
 namespace Magento\Deploy\Model\Plugin;
 
 use Magento\Deploy\Model\DeploymentConfig\ChangeDetector;
+use Magento\Framework\App\DeploymentConfig;
 use Magento\Framework\App\FrontControllerInterface;
 use Magento\Framework\App\RequestInterface;
 use Magento\Framework\Exception\LocalizedException;
@@ -20,19 +21,24 @@
  */
 class ConfigChangeDetector
 {
+    private const DEPLOYMENT_BLUE_GREEN_ENABLED = 'deployment/blue_green/enabled';
+
     /**
      * Configuration data changes detector.
      *
      * @var ChangeDetector
      */
     private $changeDetector;
 
+    private DeploymentConfig $deploymentConfig;
+
     /**
      * @param ChangeDetector $changeDetector configuration data changes detector
      */
-    public function __construct(ChangeDetector $changeDetector)
+    public function __construct(ChangeDetector $changeDetector, DeploymentConfig $deploymentConfig)
     {
         $this->changeDetector = $changeDetector;
+        $this->deploymentConfig = $deploymentConfig;
     }
 
     /**
@@ -46,7 +52,9 @@ public function __construct(ChangeDetector $changeDetector)
      */
     public function beforeDispatch(FrontControllerInterface $subject, RequestInterface $request)
     {
-        if ($this->changeDetector->hasChanges()) {
+        if (!$this->deploymentConfig->get(self::DEPLOYMENT_BLUE_GREEN_ENABLED)
+            && $this->changeDetector->hasChanges()
+        ) {
             throw new LocalizedException(
                 __(
                     'The configuration file has changed.'

app/code/Magento/Deploy/Test/Unit/Model/Plugin/ConfigChangeDetectorTest.php

@@ -9,6 +9,7 @@
 
 use Magento\Deploy\Model\DeploymentConfig\ChangeDetector;
 use Magento\Deploy\Model\Plugin\ConfigChangeDetector;
+use Magento\Framework\App\DeploymentConfig;
 use Magento\Framework\App\FrontControllerInterface;
 use Magento\Framework\App\RequestInterface;
 use PHPUnit\Framework\MockObject\MockObject;
@@ -36,6 +37,11 @@ class ConfigChangeDetectorTest extends TestCase
      */
     private $requestMock;
 
+    /**
+     * @var DeploymentConfig|mixed|MockObject
+     */
+    private $deploymentConfig;
+
     /**
      * @return void
      */
@@ -48,8 +54,14 @@ protected function setUp(): void
             ->getMockForAbstractClass();
         $this->requestMock = $this->getMockBuilder(RequestInterface::class)
             ->getMockForAbstractClass();
+        $this->deploymentConfig =$this->getMockBuilder(DeploymentConfig::class)
+            ->disableOriginalConstructor()
+            ->getMock();
 
-        $this->configChangeDetectorPlugin = new ConfigChangeDetector($this->changeDetectorMock);
+        $this->configChangeDetectorPlugin = new ConfigChangeDetector(
+            $this->changeDetectorMock,
+            $this->deploymentConfig
+        );
     }
 
     /**
@@ -65,8 +77,6 @@ public function testBeforeDispatchWithoutException()
 
     /**
      * @return void
-     * @codingStandardsIgnoreStart
-     * @codingStandardsIgnoreEnd
      */
     public function testBeforeDispatchWithException()
     {
@@ -80,4 +90,13 @@ public function testBeforeDispatchWithException()
             ->willReturn(true);
         $this->configChangeDetectorPlugin->beforeDispatch($this->frontControllerMock, $this->requestMock);
     }
+
+    public function testBeforeDispatchWithBlueGreen()
+    {
+        $this->deploymentConfig->expects($this->atLeastOnce())
+            ->method('get')
+            ->with('deployment/blue_green/enabled')
+            ->willReturn(1);
+        $this->configChangeDetectorPlugin->beforeDispatch($this->frontControllerMock, $this->requestMock);
+    }
 }

lib/internal/Magento/Framework/Cache/Backend/RemoteSynchronizedCache.php

@@ -64,6 +64,7 @@ class RemoteSynchronizedCache extends \Zend_Cache_Backend implements \Zend_Cache
         'local_backend_custom_naming' => true,
         'local_backend_autoload' => true,
         'use_stale_cache' => false,
+        'cleanup_percentage' => 95,
     ];
 
     /**
@@ -264,7 +265,7 @@ public function save($data, $id, $tags = [], $specificLifetime = false)
      */
     private function checkIfLocalCacheSpaceExceeded()
     {
-        return $this->getFillingPercentage() >= 95;
+        return $this->getFillingPercentage() >= ($this->_options['cleanup_percentage'] ?? 95);
     }
 
     /**

lib/internal/Magento/Framework/Module/Plugin/DbStatusValidator.php

@@ -5,6 +5,7 @@
  */
 namespace Magento\Framework\Module\Plugin;
 
+use Magento\Framework\App\DeploymentConfig;
 use Magento\Framework\Cache\FrontendInterface as FrontendCacheInterface;
 use Magento\Framework\Module\DbVersionInfo;
 use Magento\Framework\App\FrontController;
@@ -17,6 +18,8 @@
  */
 class DbStatusValidator
 {
+    private const DEPLOYMENT_BLUE_GREEN_ENABLED = 'deployment/blue_green/enabled';
+
     /**
      * @var FrontendCacheInterface
      */
@@ -27,14 +30,21 @@ class DbStatusValidator
      */
     private $dbVersionInfo;
 
+    private DeploymentConfig $deploymentConfig;
+
     /**
      * @param FrontendCacheInterface $cache
      * @param DbVersionInfo $dbVersionInfo
+     * @param DeploymentConfig $deploymentConfig
      */
-    public function __construct(FrontendCacheInterface $cache, DbVersionInfo $dbVersionInfo)
-    {
+    public function __construct(
+        FrontendCacheInterface $cache,
+        DbVersionInfo $dbVersionInfo,
+        DeploymentConfig $deploymentConfig
+    ) {
         $this->cache = $cache;
         $this->dbVersionInfo = $dbVersionInfo;
+        $this->deploymentConfig = $deploymentConfig;
     }
 
     /**
@@ -49,6 +59,10 @@ public function __construct(FrontendCacheInterface $cache, DbVersionInfo $dbVers
      */
     public function beforeDispatch(FrontController $subject, RequestInterface $request)
     {
+        if ($this->deploymentConfig->get(self::DEPLOYMENT_BLUE_GREEN_ENABLED)) {
+            return;
+        }
+
         if (!$this->cache->load('db_is_up_to_date')) {
             list($versionTooLowErrors, $versionTooHighErrors) = array_values($this->getGroupedDbVersionErrors());
             if ($versionTooHighErrors) {

lib/internal/Magento/Framework/Module/Test/Unit/Plugin/DbStatusValidatorTest.php

@@ -7,6 +7,7 @@
 
 namespace Magento\Framework\Module\Test\Unit\Plugin;
 
+use Magento\Framework\App\DeploymentConfig;
 use Magento\Framework\App\FrontController;
 use Magento\Framework\App\RequestInterface;
 use Magento\Framework\Cache\FrontendInterface;
@@ -50,6 +51,11 @@ class DbStatusValidatorTest extends TestCase
      */
     private $dbVersionInfoMock;
 
+    /**
+     * @var DeploymentConfig|mixed|MockObject
+     */
+    private $deploymentConfig;
+
     protected function setUp(): void
     {
         $this->_cacheMock = $this->getMockBuilder(FrontendInterface::class)
@@ -67,9 +73,15 @@ protected function setUp(): void
             ->disableOriginalConstructor()
             ->getMock();
         $this->dbVersionInfoMock = $this->createMock(DbVersionInfo::class);
+
+        $this->deploymentConfig =$this->getMockBuilder(DeploymentConfig::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
         $this->_model = new DbStatusValidator(
             $this->_cacheMock,
-            $this->dbVersionInfoMock
+            $this->dbVersionInfoMock,
+            $this->deploymentConfig
         );
     }
 
@@ -188,4 +200,20 @@ public function aroundDispatchExceptionDataProvider()
             ],
         ];
     }
+
+    public function testAroundDispatchBlueGreen()
+    {
+        $this->deploymentConfig->expects($this->atLeastOnce())
+            ->method('get')
+            ->with('deployment/blue_green/enabled')
+            ->willReturn(1);
+
+        $this->_cacheMock->expects($this->never())
+            ->method('load');
+
+        $this->dbVersionInfoMock->expects($this->never())
+            ->method('getDbVersionErrors');
+
+        $this->_model->beforeDispatch($this->subjectMock, $this->requestMock);
+    }
 }