From 61ab0d9bbb8b209723e75fda9aae8e62690d6cbc Mon Sep 17 00:00:00 2001
From: Chneemann <andre-kempf@mailbox.org>
Date: Tue, 25 Mar 2025 08:40:36 +0100
Subject: [PATCH] feat: implemented Redis caching for user data

---
 user_app/caching.py | 11 ++++++++++-
 user_app/views.py   | 17 ++++++++++++++++-
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/user_app/caching.py b/user_app/caching.py
index 73fd48a..1cefd41 100644
--- a/user_app/caching.py
+++ b/user_app/caching.py
@@ -21,4 +21,13 @@ def get_cached_user(user_id):
         cache.set(cache_key, user_data, timeout=3600)
         return json.loads(user_data)[0]['fields']
     else:
-        return None
\ No newline at end of file
+        return None
+
+
+def cache_user(user_id, user_data, timeout=3600):
+    """
+    Saves user data in the cache.
+    """
+    cache_key = f"user_{user_id}"
+    user_json = json.dumps(user_data) 
+    cache.set(cache_key, user_json, timeout)
\ No newline at end of file
diff --git a/user_app/views.py b/user_app/views.py
index 258bd06..2bb34b9 100644
--- a/user_app/views.py
+++ b/user_app/views.py
@@ -1,7 +1,22 @@
 from rest_framework import viewsets
+from rest_framework.response import Response
 from .models import User
 from .serializers import UserSerializer
+from .caching import get_cached_user, cache_user
 
 class UserViewSet(viewsets.ModelViewSet):
     queryset = User.objects.all()
-    serializer_class = UserSerializer
\ No newline at end of file
+    serializer_class = UserSerializer
+
+    def retrieve(self, request, *args, **kwargs):
+        user_id = kwargs.get("pk")
+        cached_user = get_cached_user(user_id)
+        
+        if cached_user:
+            return Response(cached_user)
+
+        user = self.get_object()
+        serialized_user = UserSerializer(user).data
+        cache_user(user_id, serialized_user)
+
+        return Response(serialized_user)
\ No newline at end of file