[Core] Feature #3432, add the Healthcheck Page

src/module-elasticsuite-core/Api/Healthcheck/CheckInterface.php

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+<?php
+/**
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade Smile ElasticSuite to newer
+ * versions in the future.
+ *
+ * @category  Smile
+ * @package   Smile\ElasticsuiteCore
+ * @author    Vadym Honcharuk <[email protected]>
+ * @copyright 2024 Smile
+ * @license   Open Software License ("OSL") v. 3.0
+ */
+
+namespace Smile\ElasticsuiteCore\Api\Healthcheck;
+
+/**
+ * Health CheckInterface.
+ */
+interface CheckInterface
+{
+    /**
+     * Retrieve the unique identifier for the health check.
+     *
+     * @return string
+     */
+    public function getIdentifier(): string;
+
+    /**
+     * Retrieve the description of the health check.
+     *
+     * @return string
+     */
+    public function getDescription(): string;
+
+    /**
+     * Retrieve the status of the health check.
+     * Expected values: 'success', 'warning'.
+     *
+     * @return string
+     */
+    public function getStatus(): string;
+
+    /**
+     * Retrieve the sort order for the health check, which determines
+     * the display order of checks in the admin panel.
+     *
+     * @return int
+     */
+    public function getSortOrder(): int;
+}

src/module-elasticsuite-core/Block/Adminhtml/Healthcheck/Healthcheck.php

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+<?php
+/**
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade Smile ElasticSuite to newer
+ * versions in the future.
+ *
+ * @category  Smile
+ * @package   Smile\ElasticsuiteCore
+ * @author    Vadym Honcharuk <[email protected]>
+ * @copyright 2024 Smile
+ * @license   Open Software License ("OSL") v. 3.0
+ */
+
+namespace Smile\ElasticsuiteCore\Block\Adminhtml\Healthcheck;
+
+use Magento\Backend\Block\Template;
+use Magento\Backend\Block\Template\Context;
+use Smile\ElasticsuiteCore\Api\Healthcheck\CheckInterface;
+use Smile\ElasticsuiteCore\Model\Healthcheck\HealthcheckList;
+
+/**
+ * Class Healthcheck.
+ *
+ * Block class for displaying Elasticsuite health checks in the Magento Admin panel.
+ */
+class Healthcheck extends Template
+{
+    /**
+     * HealthcheckList instance to manage and retrieve health checks.
+     *
+     * @var HealthcheckList
+     */
+    private $healthcheckList;
+
+    /**
+     * Constructor.
+     *
+     * @param Context         $context         Magento context object for backend blocks.
+     * @param HealthcheckList $healthcheckList The health check list object providing health check data.
+     * @param array           $data            Additional block data.
+     */
+    public function __construct(Context $context, HealthcheckList $healthcheckList, array $data = [])
+    {
+        parent::__construct($context, $data);
+        $this->healthcheckList = $healthcheckList;
+    }
+
+    /**
+     * Retrieve all health checks.
+     *
+     * Provides an array of health check instances, each implementing the CheckInterface,
+     * sorted by their specified order.
+     *
+     * @return CheckInterface[]
+     */
+    public function getHealthchecks(): array
+    {
+        return $this->healthcheckList->getChecks();
+    }
+}

src/module-elasticsuite-core/Controller/Adminhtml/Healthcheck/Index.php

@@ -0,0 +1,42 @@
+<?php
+/**
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade Smile ElasticSuite to newer
+ * versions in the future.
+ *
+ * @category  Smile
+ * @package   Smile\ElasticsuiteCore
+ * @author    Vadym Honcharuk <[email protected]>
+ * @copyright 2024 Smile
+ * @license   Open Software License ("OSL") v. 3.0
+ */
+
+namespace Smile\ElasticsuiteCore\Controller\Adminhtml\Healthcheck;
+
+use Magento\Framework\App\Action\HttpGetActionInterface;
+use Magento\Framework\Controller\ResultFactory;
+use Magento\Framework\View\Result\Page;
+use Smile\ElasticsuiteIndices\Controller\Adminhtml\AbstractAction;
+
+/**
+ * Class Index.
+ */
+class Index extends AbstractAction implements HttpGetActionInterface
+{
+    /**
+     * @inheritdoc
+     *
+     * @return Page
+     */
+    public function execute(): Page
+    {
+        $breadMain = __('Healthcheck');
+
+        /** @var Page $resultPage */
+        $resultPage = $this->resultFactory->create(ResultFactory::TYPE_PAGE);
+        $resultPage->getConfig()->getTitle()->prepend($breadMain);
+
+        return $resultPage;
+    }
+}

src/module-elasticsuite-core/Model/Healthcheck/GhostIndicesCheck.php

@@ -0,0 +1,164 @@
+<?php
+/**
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade Smile ElasticSuite to newer
+ * versions in the future.
+ *
+ * @category  Smile
+ * @package   Smile\ElasticsuiteCore
+ * @author    Vadym Honcharuk <[email protected]>
+ * @copyright 2024 Smile
+ * @license   Open Software License ("OSL") v. 3.0
+ */
+
+namespace Smile\ElasticsuiteCore\Model\Healthcheck;
+
+use Exception;
+use Magento\Framework\UrlInterface;
+use Smile\ElasticsuiteCore\Api\Healthcheck\CheckInterface;
+use Smile\ElasticsuiteIndices\Model\IndexStatsProvider;
+
+/**
+ * Class GhostIndicesCheck.
+ *
+ * Health check to identify any ghost indices in the Elasticsearch cluster.
+ */
+class GhostIndicesCheck implements CheckInterface
+{
+    /**
+     * Route to Elasticsuite -> Indices page.
+     */
+    private const ROUTE_ELASTICSUITE_INDICES = 'smile_elasticsuite_indices';
+
+    public const GHOST_STATUS = 'ghost';
+
+    /**
+     * @var IndexStatsProvider
+     */
+    private $indexStatsProvider;
+
+    /**
+     * @var UrlInterface
+     */
+    private $urlBuilder;
+
+    /**
+     * Constructor.
+     *
+     * @param IndexStatsProvider $indexStatsProvider Index stats provider.
+     * @param UrlInterface       $urlBuilder         URL builder.
+     */
+    public function __construct(
+        IndexStatsProvider $indexStatsProvider,
+        UrlInterface $urlBuilder
+    ) {
+        $this->indexStatsProvider = $indexStatsProvider;
+        $this->urlBuilder = $urlBuilder;
+    }
+
+    /**
+     * Retrieve the unique identifier for this health check.
+     *
+     * @return string
+     */
+    public function getIdentifier(): string
+    {
+        return 'ghost_indices_check';
+    }
+
+    /**
+     * Retrieve a brief description of this health check.
+     *
+     * @return string
+     * @throws Exception
+     */
+    public function getDescription(): string
+    {
+        $ghostCount = $this->getNumberOfGhostIndices();
+
+        if ($ghostCount > 0) {
+            // Description when ghost indices are found.
+            // @codingStandardsIgnoreStart
+            return __(
+                'You have <strong>%1 ghost indices</strong>. Ghost indices have a footprint on your Elasticsearch cluster health. '
+                . 'You should consider removing them.<br/>'
+                . 'Click <a href="%2"><strong>here</strong></a> to go to the <strong>Elasticsuite Indices</strong> page to take appropriate actions.',
+                $ghostCount,
+                $this->getElasticsuiteIndicesUrl()
+            );
+            // @codingStandardsIgnoreEnd
+        }
+
+        // Description when no ghost indices are found.
+        return __('There are no ghost indexes in your Elasticsearch cluster. No action is required at this time.');
+    }
+
+    /**
+     * Retrieve the status of this health check.
+     * Returns 'warning' if ghost indices are found, otherwise 'success'.
+     *
+     * @return string
+     * @throws Exception
+     */
+    public function getStatus(): string
+    {
+        return $this->hasGhostIndices() ? 'warning' : 'success';
+    }
+
+    /**
+     * Retrieve the sort order for this health check.
+     *
+     * @return int
+     */
+    public function getSortOrder(): int
+    {
+        return 10; // Adjust as necessary.
+    }
+
+    /**
+     * Checks if there are any ghost indices.
+     *
+     * @return bool
+     * @throws Exception
+     */
+    private function hasGhostIndices(): bool
+    {
+        return $this->getNumberOfGhostIndices() > 0;
+    }
+
+    /**
+     * Get number of ghost Elasticsuite indices.
+     *
+     * @return int
+     * @throws Exception
+     */
+    private function getNumberOfGhostIndices(): int
+    {
+        $ghostIndices = 0;
+        $elasticsuiteIndices = $this->indexStatsProvider->getElasticSuiteIndices();
+
+        if ($elasticsuiteIndices !== null) {
+            foreach ($elasticsuiteIndices as $indexName => $indexAlias) {
+                $indexData = $this->indexStatsProvider->indexStats($indexName, $indexAlias);
+
+                if (array_key_exists('index_status', $indexData)
+                    && $indexData['index_status'] === self::GHOST_STATUS) {
+                    $ghostIndices++;
+                }
+            }
+        }
+
+        return $ghostIndices;
+    }
+
+    /**
+     * Retrieve a URL to the Elasticsuite Indices page for more information.
+     *
+     * @return string
+     */
+    private function getElasticsuiteIndicesUrl(): string
+    {
+        return $this->urlBuilder->getUrl(self::ROUTE_ELASTICSUITE_INDICES);
+    }
+}

src/module-elasticsuite-core/Model/Healthcheck/HealthcheckList.php

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+<?php
+/**
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade Smile ElasticSuite to newer
+ * versions in the future.
+ *
+ * @category  Smile
+ * @package   Smile\ElasticsuiteCore
+ * @author    Vadym Honcharuk <[email protected]>
+ * @copyright 2024 Smile
+ * @license   Open Software License ("OSL") v. 3.0
+ */
+
+namespace Smile\ElasticsuiteCore\Model\Healthcheck;
+
+use Smile\ElasticsuiteCore\Api\Healthcheck\CheckInterface;
+
+/**
+ * Class HealthcheckList.
+ *
+ * Manages a list of health checks for the Elasticsuite module.
+ */
+class HealthcheckList
+{
+    /**
+     * Array of health checks implementing the CheckInterface.
+     *
+     * @var CheckInterface[]
+     */
+    private $checks;
+
+    /**
+     * Constructor.
+     *
+     * @param CheckInterface[] $checks Array of health checks to be managed by this list.
+     */
+    public function __construct(array $checks = [])
+    {
+        $this->checks = $checks;
+    }
+
+    /**
+     * Retrieve all health checks, sorted by their sort order.
+     *
+     * Sorts the checks based on the value returned by each check's `getSortOrder` method.
+     *
+     * @return CheckInterface[] Array of health checks sorted by order.
+     * @SuppressWarnings(PHPMD.ShortVariable)
+     */
+    public function getChecks(): array
+    {
+        usort($this->checks, function (CheckInterface $a, CheckInterface $b) {
+            return $a->getSortOrder() <=> $b->getSortOrder();
+        });
+
+        return $this->checks;
+    }
+}