B2B-2255: "Currency" GraphQl query has no cache identity

Author: joanhe

app/code/Magento/DirectoryGraphQl/Model/Cache/Tag/Strategy/Currency.php

@@ -0,0 +1,34 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\DirectoryGraphQl\Model\Cache\Tag\Strategy;
+
+use Magento\Directory\Model\Currency as CurrencyModel;
+use Magento\DirectoryGraphQl\Model\Resolver\Currency\Identity;
+use Magento\Framework\App\Cache\Tag\StrategyInterface;
+
+/**
+ * Produce cache tags for currency object.
+ */
+class Currency implements StrategyInterface
+{
+    /**
+     * @inheritdoc
+     */
+    public function getTags($object): array
+    {
+        if (!is_object($object)) {
+            throw new \InvalidArgumentException('Provided argument is not an object');
+        }
+
+        if ($object instanceof CurrencyModel) {
+            return [Identity::CACHE_TAG];
+        }
+
+        return [];
+    }
+}

app/code/Magento/DirectoryGraphQl/Model/Cache/Tag/Strategy/CurrencyConfig.php

@@ -0,0 +1,47 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\DirectoryGraphQl\Model\Cache\Tag\Strategy;
+
+use Magento\CurrencySymbol\Model\System\Currencysymbol;
+use Magento\Directory\Model\Currency;
+use Magento\DirectoryGraphQl\Model\Resolver\Currency\Identity;
+use Magento\Framework\App\Cache\Tag\StrategyInterface;
+use Magento\Framework\App\Config\ValueInterface;
+
+/**
+ * Produce cache tags for currency config.
+ */
+class CurrencyConfig implements StrategyInterface
+{
+    private $currencyConfigPaths = [
+        Currency::XML_PATH_CURRENCY_BASE,
+        Currency::XML_PATH_CURRENCY_DEFAULT,
+        Currency::XML_PATH_CURRENCY_ALLOW,
+        Currencysymbol::XML_PATH_CUSTOM_CURRENCY_SYMBOL
+    ];
+
+    /**
+     * @inheritdoc
+     */
+    public function getTags($object): array
+    {
+        if (!is_object($object)) {
+            throw new \InvalidArgumentException('Provided argument is not an object');
+        }
+
+        if (
+            $object instanceof ValueInterface
+            && in_array($object->getPath(), $this->currencyConfigPaths)
+            && $object->isValueChanged()
+        ) {
+            return [Identity::CACHE_TAG];
+        }
+
+        return [];
+    }
+}

app/code/Magento/DirectoryGraphQl/Model/Resolver/Currency/Identity.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\DirectoryGraphQl\Model\Resolver\Currency;
+
+use Magento\Framework\GraphQl\Query\Resolver\IdentityInterface;
+
+class Identity implements IdentityInterface
+{
+    /**
+     * @var string
+     */
+    public const CACHE_TAG = 'gql_currency';
+
+    public function getIdentities(array $resolvedData): array
+    {
+        return [self::CACHE_TAG];
+    }
+}

app/code/Magento/DirectoryGraphQl/Plugin/Currency.php

@@ -0,0 +1,45 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\DirectoryGraphQl\Plugin;
+
+use Magento\Framework\Event\ManagerInterface;
+use Magento\Directory\Model\Currency as CurrencyModel;
+
+/**
+ * Currency plugin
+ */
+class Currency
+{
+    /**
+     * Application Event Dispatcher
+     *
+     * @var ManagerInterface
+     */
+    private $eventManager;
+
+    /**
+     * @param ManagerInterface $eventManager
+     */
+    public function __construct(ManagerInterface $eventManager)
+    {
+        $this->eventManager = $eventManager;
+    }
+
+    /**
+     * Add graphql store config tag to the store group cache identities.
+     *
+     * @param CurrencyModel $subject
+     * @param CurrencyModel $result
+     * @return CurrencyModel
+     */
+    public function afterSaveRates(CurrencyModel $subject, CurrencyModel $result): CurrencyModel
+    {
+        $this->eventManager->dispatch('clean_cache_by_tags', ['object' => $this]);
+        return $result;
+    }
+}

app/code/Magento/DirectoryGraphQl/etc/di.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <type name="Magento\Framework\App\Cache\Tag\Strategy\Factory">
+        <arguments>
+            <argument name="customStrategies" xsi:type="array">
+                <item name="Magento\Framework\App\Config\ValueInterface" xsi:type="object">\Magento\DirectoryGraphQl\Model\Cache\Tag\Strategy\CurrencyConfig</item>
+                <item name="Magento\Directory\Model\Currency" xsi:type="object">\Magento\DirectoryGraphQl\Model\Cache\Tag\Strategy\Currency</item>
+            </argument>
+        </arguments>
+    </type>
+    <type name="Magento\Directory\Model\Currency">
+        <plugin name="afterSaveRate" type="Magento\DirectoryGraphQl\Plugin\Currency" />
+    </type>
+</config>

app/code/Magento/DirectoryGraphQl/etc/schema.graphqls

@@ -2,7 +2,7 @@
 # See COPYING.txt for license details.
 
 type Query {
-    currency: Currency @resolver(class: "Magento\\DirectoryGraphQl\\Model\\Resolver\\Currency") @doc(description: "Return information about the store's currency.") @cache(cacheable: false)
+    currency: Currency @resolver(class: "Magento\\DirectoryGraphQl\\Model\\Resolver\\Currency") @doc(description: "Return information about the store's currency.") @cache(cacheIdentity: "Magento\\DirectoryGraphQl\\Model\\Resolver\\Currency\\Identity")
     countries: [Country] @resolver(class: "Magento\\DirectoryGraphQl\\Model\\Resolver\\Countries") @doc(description: "The countries query provides information for all countries.") @cache(cacheable: false)
     country (id: String): Country @resolver(class: "Magento\\DirectoryGraphQl\\Model\\Resolver\\Country") @doc(description: "The countries query provides information for a single country.") @cache(cacheable: false)
 }