153 lines
5.6 KiB
Python
153 lines
5.6 KiB
Python
"""公共视图组件：async 分页 + 多租户基类 + 创建注入。
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供 apps/catalog, apps/partner 等共享。
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"""
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from adrf.viewsets import ModelViewSet
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from adrf.shortcuts import aget_object_or_404
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from asgiref.sync import sync_to_async
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from django.db.models import Q
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def resolve_tenant(code):
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from apps.core.models import Tenant
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try:
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return Tenant.objects.get(code=code, is_active=True)
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except Tenant.DoesNotExist:
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return None
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class StandardAsyncPagination:
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"""手写 async 分页器（兼容 coroutine 或 queryset 入参）。"""
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page_size = 20
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page_size_query_param = "page_size"
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max_page_size = 200
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async def paginate_queryset(self, queryset, request, view=None):
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import asyncio
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if asyncio.iscoroutine(queryset):
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queryset = await queryset
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try:
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page_size = int(request.query_params.get(self.page_size_query_param, self.page_size))
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except (TypeError, ValueError):
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page_size = self.page_size
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if page_size < 1: # 0 / 负数会导致空切片或异常
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page_size = self.page_size
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page_size = min(page_size, self.max_page_size)
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try:
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page_number = int(request.query_params.get("page", 1))
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except (TypeError, ValueError):
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page_number = 1
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# 页码必须 ≥1：page=0/-1 会导致负索引切片（Django 会抛 ValueError → 500）
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if page_number < 1:
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page_number = 1
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self.total = await sync_to_async(queryset.count)()
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start = (page_number - 1) * page_size
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end = start + page_size
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sliced = await sync_to_async(lambda: list(queryset[start:end]))()
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return sliced
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def get_paginated_response(self, data):
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from rest_framework.response import Response
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return Response({
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"count": getattr(self, "total", 0),
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"next": None,
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"previous": None,
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"results": data,
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})
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class BaseTenantViewSet(ModelViewSet):
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"""通用：自动按租户过滤 + 软删除过滤 + 自定义 search + create 注入 tenant。"""
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pagination_class = StandardAsyncPagination
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async def get_tenant(self):
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tenant = getattr(self.request, "tenant_obj", None)
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if tenant is not None:
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return tenant
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from django.conf import settings
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code = self.request.META.get(
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"HTTP_X_TENANT_ID", settings.TENANT_DEFAULT
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)
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return await sync_to_async(resolve_tenant)(code)
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# 子类可声明关联预取，避免列表接口 N+1
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# （实测：未声明时 50 张销售单产生 311 条 SQL，声明后降到 3 条）
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select_related_fields: tuple = ()
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prefetch_related_fields: tuple = ()
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async def get_queryset(self):
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tenant = await self.get_tenant()
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if tenant is None:
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return self.model.objects.none()
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qs = self.model.objects.active().filter(tenant=tenant)
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# 关联预取：消除列表页 N+1（嵌套的 prefetch 用 "__" 路径）
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if self.select_related_fields:
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qs = qs.select_related(*self.select_related_fields)
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if self.prefetch_related_fields:
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qs = qs.prefetch_related(*self.prefetch_related_fields)
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search = self.request.query_params.get("search", "").strip()
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if search and getattr(self, "search_fields", None):
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q = Q()
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for f in self.search_fields:
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q |= Q(**{f"{f}__icontains": search})
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qs = qs.filter(q)
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return qs
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async def aget_object(self):
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"""修复 adrf aget_object 不支持 async get_queryset 的问题。
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adrf 原实现同步调用 self.get_queryset()，拿到 coroutine 后在
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aget_object_or_404 里 TypeError → 被吞成 Http404，导致全项目
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所有 detail 路由（retrieve/PUT/PATCH/DELETE）404。
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"""
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queryset = await self.get_queryset()
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queryset = await self.afilter_queryset(queryset)
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lookup_url_kwarg = self.lookup_url_kwarg or self.lookup_field
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filter_kwargs = {self.lookup_field: self.kwargs[lookup_url_kwarg]}
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obj = await aget_object_or_404(queryset, **filter_kwargs)
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await sync_to_async(self.check_object_permissions)(self.request, obj)
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return obj
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async def acreate(self, request, *args, **kwargs):
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from rest_framework.exceptions import ValidationError
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from rest_framework import status
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from rest_framework.response import Response
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tenant = await self.get_tenant()
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if tenant is None:
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raise ValidationError({"tenant": "无法识别租户"})
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# 套餐配额拦截（批次 C1）：声明了 quota_kind 的 ViewSet 在写入前校验
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quota_kind = getattr(self, "quota_kind", None)
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if quota_kind:
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from apps.billing import quota as billing_quota
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def _check():
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return billing_quota.check_and_count(tenant, quota_kind, delta=1)
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try:
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await sync_to_async(_check)()
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except billing_quota.QuotaExceeded as exc:
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return Response(exc.as_dict(), status=status.HTTP_403_FORBIDDEN)
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serializer = self.get_serializer(data=request.data)
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serializer.is_valid(raise_exception=True)
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validated = serializer.validated_data
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validated["tenant"] = tenant
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if request.user.is_authenticated:
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validated["created_by"] = request.user
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validated["updated_by"] = request.user
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await sync_to_async(serializer.save)()
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return Response(serializer.data, status=status.HTTP_201_CREATED)
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