fix cache

account/views/oj.py

@@ -16,7 +16,8 @@ from otpauth import OtpAuth
 
 from problem.models import Problem
 from submission.models import Submission, JudgeStatus
-from utils.constants import ContestRuleType
+from django.core.cache import cache
+from utils.constants import ContestRuleType, CacheKey
 from options.options import SysOptions
 from utils.api import APIView, validate_serializer, CSRFExemptAPIView
 from utils.captcha import Captcha
@@ -464,6 +465,11 @@ class UserActivityRankAPI(APIView):
         start = request.GET.get("start")
         if not start:
             return self.error("start time is required")
+        cache_key = f"{CacheKey.user_activity_rank}:{start}"
+        cached = cache.get(cache_key)
+        if cached is not None:
+            return self.success(cached)
+
         hidden_names = User.objects.filter(
             Q(admin_type=AdminType.SUPER_ADMIN) | Q(is_disabled=True)
         ).values_list("username", flat=True)
@@ -477,6 +483,7 @@ class UserActivityRankAPI(APIView):
             .annotate(count=Count("problem_id", distinct=True))
             .order_by("-count")[:10]
         )
+        cache.set(cache_key, data, 600)
         return self.success(data)
 
 

comment/views/oj.py

@@ -1,8 +1,10 @@
-from django.db.models import Avg
+from django.core.cache import cache
+from django.db.models import Avg, Count
 from django.db.models.functions import Round
 from comment.models import Comment
 from problem.models import Problem
 from utils.api import APIView
+from utils.constants import CacheKey
 from account.decorators import login_required
 from utils.api.api import validate_serializer
 from comment.serializers import CreateCommentSerializer, CommentSerializer
@@ -46,6 +48,7 @@ class CommentAPI(APIView):
             comprehensive_rating=data["comprehensive_rating"],
             content=data["content"],
         )
+        cache.delete(f"{CacheKey.comment_stats}:{problem.id}")
         return self.success()
 
     @login_required
@@ -65,16 +68,24 @@ class CommentAPI(APIView):
 class CommentStatisticsAPI(APIView):
     def get(self, request):
         problem_id = request.GET.get("problem_id")
-        comments = Comment.objects.select_related("problem").filter(
+        cache_key = f"{CacheKey.comment_stats}:{problem_id}"
-            problem_id=problem_id
+        cached = cache.get(cache_key)
-        )
+        if cached is not None:
-        if comments.count() == 0:
+            return self.success(cached)
-            return self.success()
 
-        count = comments.count()
+        agg = Comment.objects.filter(problem_id=problem_id).aggregate(
-        rating = comments.aggregate(
+            count=Count("id"),
             description=Round(Avg("description_rating"), 2),
             difficulty=Round(Avg("difficulty_rating"), 2),
             comprehensive=Round(Avg("comprehensive_rating"), 2),
         )
-        return self.success({"count": count, "rating": rating})
+        if not agg["count"]:
+            return self.success()
+
+        data = {"count": agg["count"], "rating": {
+            "description": agg["description"],
+            "difficulty": agg["difficulty"],
+            "comprehensive": agg["comprehensive"],
+        }}
+        cache.set(cache_key, data, 3600)
+        return self.success(data)

problem/views/oj.py

@@ -19,12 +19,19 @@ from contest.models import ContestRuleType
 
 class ProblemTagAPI(APIView):
     def get(self, request):
+        keyword = request.GET.get("keyword", "")
+        cache_key = f"{CacheKey.problem_tags}:{keyword}"
+        cached = cache.get(cache_key)
+        if cached is not None:
+            return self.success(cached)
+
         qs = ProblemTag.objects
-        keyword = request.GET.get("keyword")
         if keyword:
             qs = ProblemTag.objects.filter(name__icontains=keyword)
         tags = qs.annotate(problem_count=Count("problem")).filter(problem_count__gt=0)
-        return self.success(TagSerializer(tags, many=True).data)
+        data = TagSerializer(tags, many=True).data
+        cache.set(cache_key, data, 3600)
+        return self.success(data)
 
 
 class PickOneAPI(APIView):

utils/constants.py

@@ -26,6 +26,9 @@ class CacheKey:
     contest_rank_cache = "contest_rank_cache"
     website_config = "website_config"
     problem_authors = "problem_authors"
+    problem_tags = "problem_tags"
+    comment_stats = "comment_stats"
+    user_activity_rank = "user_activity_rank"
 
 
 class Difficulty(Choices):