From be2e3fac2536bdfdfec9711b9ab715c001d458cc Mon Sep 17 00:00:00 2001
From: David Buchmann <david.buchmann@liip.ch>
Date: Mon, 8 Apr 2019 10:04:19 +0200
Subject: [PATCH] avoid unnecessary cache key changes

---
 .../Normalizer/AbstractNormalizer.php         |  9 ++++---
 .../Normalizer/AbstractObjectNormalizer.php   | 25 +++++++++++++------
 2 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php
index ef1166a493497..31811b2c7b59f 100644
--- a/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php
@@ -397,7 +397,7 @@ protected function denormalizeParameter(\ReflectionClass $class, \ReflectionPara
                 }
                 $parameterClass = $parameter->getClass()->getName();
 
-                return $this->serializer->denormalize($parameterData, $parameterClass, $format, $this->createChildContext($context, $parameterName));
+                return $this->serializer->denormalize($parameterData, $parameterClass, $format, $this->createChildContext($context, $parameterName, $format));
             }
 
             return $parameterData;
@@ -407,14 +407,15 @@ protected function denormalizeParameter(\ReflectionClass $class, \ReflectionPara
     }
 
     /**
-     * @param array  $parentContext
-     * @param string $attribute
+     * @param array       $parentContext
+     * @param string      $attribute     Attribute name
+     * @param string|null $format
      *
      * @return array
      *
      * @internal
      */
-    protected function createChildContext(array $parentContext, $attribute)
+    protected function createChildContext(array $parentContext, $attribute/*, ?string $format*/)
     {
         if (isset($parentContext[self::ATTRIBUTES][$attribute])) {
             $parentContext[self::ATTRIBUTES] = $parentContext[self::ATTRIBUTES][$attribute];
diff --git a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
index 54497216802f1..4d65568d2e5c2 100644
--- a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
@@ -58,7 +58,7 @@ public function supportsNormalization($data, $format = null)
     public function normalize($object, $format = null, array $context = [])
     {
         if (!isset($context['cache_key'])) {
-            $context['cache_key'] = $this->getAttributeCacheKey($format, $context);
+            $context['cache_key'] = $this->getCacheKey($format, $context);
         }
 
         if ($this->isCircularReference($object, $context)) {
@@ -94,7 +94,7 @@ public function normalize($object, $format = null, array $context = [])
                 throw new LogicException(sprintf('Cannot normalize attribute "%s" because the injected serializer is not a normalizer', $attribute));
             }
 
-            $data = $this->updateData($data, $attribute, $this->serializer->normalize($attributeValue, $format, $this->createChildContext($context, $attribute)));
+            $data = $this->updateData($data, $attribute, $this->serializer->normalize($attributeValue, $format, $this->createChildContext($context, $attribute, $format)));
         }
 
         return $data;
@@ -174,7 +174,7 @@ public function supportsDenormalization($data, $type, $format = null)
     public function denormalize($data, $class, $format = null, array $context = [])
     {
         if (!isset($context['cache_key'])) {
-            $context['cache_key'] = $this->getAttributeCacheKey($format, $context);
+            $context['cache_key'] = $this->getCacheKey($format, $context);
         }
 
         $allowedAttributes = $this->getAllowedAttributes($class, $context, true);
@@ -274,7 +274,7 @@ private function validateAndDenormalize($currentClass, $attribute, $data, $forma
                     throw new LogicException(sprintf('Cannot denormalize attribute "%s" for class "%s" because injected serializer is not a denormalizer', $attribute, $class));
                 }
 
-                $childContext = $this->createChildContext($context, $attribute);
+                $childContext = $this->createChildContext($context, $attribute, $format);
                 if ($this->serializer->supportsDenormalization($data, $class, $format, $childContext)) {
                     return $this->serializer->denormalize($data, $class, $format, $childContext);
                 }
@@ -377,11 +377,19 @@ private function isMaxDepthReached(array $attributesMetadata, $class, $attribute
      *
      * {@inheritdoc}
      */
-    protected function createChildContext(array $parentContext, $attribute)
+    protected function createChildContext(array $parentContext, $attribute/*, string $format = null*/)
     {
-        $context = parent::createChildContext($parentContext, $attribute);
+        if (\func_num_args() >= 3) {
+            $format = \func_get_arg(2);
+        } else {
+            @trigger_error(sprintf('Method %s::%s() will have a 3rd `string $format = null` argument in version 5.0. Not defining it is deprecated since Symfony 3.4.', \get_class($this), __FUNCTION__), E_USER_DEPRECATED);
+
+            $format = null;
+        }
+
+        $context = parent::createChildContext($parentContext, $attribute, $format);
         // format is already included in the cache_key of the parent.
-        $context['cache_key'] = $this->getAttributeCacheKey('', $context);
+        $context['cache_key'] = $this->getCacheKey($format, $context);
 
         return $context;
     }
@@ -396,8 +404,9 @@ protected function createChildContext(array $parentContext, $attribute)
      *
      * @return bool|string
      */
-    private function getAttributeCacheKey($format, array $context)
+    private function getCacheKey($format, array $context)
     {
+        unset($context['cache_key']); // avoid artifically different keys
         try {
             return md5($format.serialize([
                 'context' => $context,