feat: base CustomGenericViewSet 添加自动事务

apps/utils/mixins.py

@@ -9,7 +9,6 @@ from django.utils.timezone import now
 from user_agents import parse
 import logging
 from rest_framework.response import Response
-from django.db import transaction
 from rest_framework.exceptions import ParseError, ValidationError
 from apps.utils.errors import PKS_ERROR
 from rest_framework.generics import get_object_or_404
@@ -91,10 +90,9 @@ class BulkCreateModelMixin(CreateModelMixin):
         many = False
         if isinstance(rdata, list):
             many = True
-        with transaction.atomic():
-            sr = self.get_serializer(data=rdata, many=many)
-            sr.is_valid(raise_exception=True)
-            self.perform_create(sr)
+        sr = self.get_serializer(data=rdata, many=many)
+        sr.is_valid(raise_exception=True)
+        self.perform_create(sr)
         if many:
             self.after_bulk_create(sr.data)
         return Response(sr.data, status=201)
@@ -124,16 +122,15 @@ class BulkUpdateModelMixin(UpdateModelMixin):
             queryset = self.filter_queryset(self.get_queryset())
             objs = []
             if isinstance(request.data, list):
-                with transaction.atomic():
-                    for ind, item in enumerate(request.data):
-                        obj = get_object_or_404(queryset, id=item['id'])
-                        sr = self.get_serializer(obj, data=item, partial=partial)
-                        if not sr.is_valid():
-                            err_dict = { f'第{ind+1}': sr.errors}
-                            raise ValidationError(err_dict)
-                        self.perform_update(sr)  # 用自带的更新,可能需要做其他操作
-                        objs.append(sr.data)
-                    self.after_bulk_update(objs)
+                for ind, item in enumerate(request.data):
+                    obj = get_object_or_404(queryset, id=item['id'])
+                    sr = self.get_serializer(obj, data=item, partial=partial)
+                    if not sr.is_valid():
+                        err_dict = { f'第{ind+1}': sr.errors}
+                        raise ValidationError(err_dict)
+                    self.perform_update(sr)  # 用自带的更新,可能需要做其他操作
+                    objs.append(sr.data)
+                self.after_bulk_update(objs)
             else:
                 raise ParseError('提交数据非列表')
             return Response(objs)

apps/utils/viewsets.py

@@ -1,6 +1,6 @@
 
 from django.core.cache import cache
-from django.http import StreamingHttpResponse
+from django.http import StreamingHttpResponse, Http404
 from rest_framework.decorators import action
 from rest_framework.exceptions import ParseError
 from rest_framework.mixins import RetrieveModelMixin
@@ -18,6 +18,9 @@ from apps.utils.serializers import ComplexSerializer
 from rest_framework.throttling import UserRateThrottle
 from drf_yasg.utils import swagger_auto_schema
 import json
+from django.db import connection
+from django.core.exceptions import ObjectDoesNotExist
+from django.db import transaction
 
 
 class CustomGenericViewSet(MyLoggingMixin, GenericViewSet):
@@ -59,6 +62,30 @@ class CustomGenericViewSet(MyLoggingMixin, GenericViewSet):
             cls._initialized = True
         return super().__new__(cls)
     
+    def dispatch(self, request, *args, **kwargs):
+        # 判断是否需要事务
+        if self._should_use_transaction(request):
+            with transaction.atomic():
+                return super().dispatch(request, *args, **kwargs)
+        else:
+            return super().dispatch(request, *args, **kwargs)
+    
+    def _should_use_transaction(self, request):
+        """判断当前请求是否需要事务"""
+        # 标准的写操作需要事务
+        if request.method in ('POST', 'PUT', 'PATCH', 'DELETE'):
+            # 但还要看具体是哪个action
+            action = self.action_map.get(request.method.lower(), {}).get(request.method.lower())
+            if action in ['create', 'update', 'partial_update', 'destroy']:
+                return True
+        
+        # 自定义的action：可以通过在action方法上添加装饰器或特殊属性来判断
+        action = getattr(self, self.action, None) if self.action else None
+        if action and getattr(action, 'requires_transaction', False):
+            return True
+            
+        return False
+        
     def finalize_response(self, request, response, *args, **kwargs):
         # 如果是流式响应，直接返回
         if isinstance(response, StreamingHttpResponse):
@@ -89,6 +116,34 @@ class CustomGenericViewSet(MyLoggingMixin, GenericViewSet):
             elif hash_v_e:
                 return Response(hash_v_e)
 
+    def get_object(self, force_lock=False):
+        """
+        智能加锁的get_object
+        - 只读请求：普通查询
+        - 非只读请求且在事务中：加锁查询
+        - 非只读请求但不在事务中：普通查询（带警告）
+        """
+        # 只读方法列表
+        read_only_methods = ['GET', 'HEAD', 'OPTIONS']
+        
+        if self.request.method not in read_only_methods and connection.in_atomic_block:
+            if force_lock:
+                raise ParseError("当前操作需要在事务中进行，请使用事务装饰器")
+            # 非只读请求且在事务中：加锁查询
+            queryset = self.filter_queryset(self.get_queryset())
+            lookup_url_kwarg = self.lookup_url_kwarg or self.lookup_field
+            filter_kwargs = {self.lookup_field: self.kwargs[lookup_url_kwarg]}
+            
+            try:
+                obj = queryset.select_for_update().get(**filter_kwargs)
+                self.check_object_permissions(self.request, obj)
+                return obj
+            except ObjectDoesNotExist:
+                raise Http404
+        else:
+            # 其他情况：普通查询
+            return super().get_object()
+    
     def get_serializer_class(self):
         action_serializer_name = f"{self.action}_serializer_class"
         action_serializer_class = getattr(self, action_serializer_name, None)
@@ -193,5 +248,4 @@ class CustomModelViewSet(BulkCreateModelMixin, BulkUpdateModelMixin, CustomListM
                          CustomRetrieveModelMixin, BulkDestroyModelMixin, ComplexQueryMixin, CustomGenericViewSet):
     """
     增强的ModelViewSet
-    """
-    pass
+    """