baseline: 批次A-D 成果 + membership 半成品（测试红）
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"""审计日志服务（迭代第 3 轮）。
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**为什么需要**：`AuditLog` 模型在阶段 1 就定义了，但**全项目没有写入过一条**——
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意味着过账、强制放行、改价这些关键操作没有任何追溯记录。对财务/合规场景这是硬缺口
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（客户问"这张单谁改的价"时答不上来）。
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设计原则：
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1. **记录"有后果"的操作**，不是所有 CRUD（否则日志淹没在噪音里）：
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- 单据状态变更（过账/作废）
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- 越过管控（信用超限强制放行、低于最低售价放行、超配额）
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- 金额相关变更（改价、抹零）
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- 权限相关（API Key 签发、商城账号开通、套餐变更）
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2. **写入失败绝不影响主业务**（审计是旁路，不能因为日志问题让开单失败）；
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3. 携带足够的上下文以便事后追责：谁、何时、对什么、改了什么、从什么到什么。
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"""
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from __future__ import annotations
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import logging
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from typing import Optional
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from .models import AuditLog
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logger = logging.getLogger("dealerhub.audit")
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# 业务动作常量（比通用 CRUD 更精确，便于按动作筛选）
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ACTION_POST = "post" # 过账/确认
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ACTION_CANCEL = "cancel" # 作废/取消
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ACTION_FORCE = "force" # 越过管控放行
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ACTION_PRICE_OVERRIDE = "price_override" # 改价
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ACTION_QUOTA_EXCEEDED = "quota_exceeded" # 配额超限尝试
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ACTION_ISSUE = "issue" # 签发（API Key / 商城账号）
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ACTION_PLAN_CHANGE = "plan_change" # 套餐变更
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ACTION_SEED = "seed" # 数据初始化
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# 为了复用 AuditLog.ACTION_CHOICES 的既有选择，把上述动作归入既有类别
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_ACTION_TO_CHOICE = {
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ACTION_POST: "update",
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ACTION_CANCEL: "update",
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ACTION_FORCE: "update",
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ACTION_PRICE_OVERRIDE: "update",
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ACTION_QUOTA_EXCEEDED: "view",
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ACTION_ISSUE: "create",
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ACTION_PLAN_CHANGE: "update",
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ACTION_SEED: "create",
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}
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def log(
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*,
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tenant,
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action: str,
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target_type: str,
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target_id: str = "",
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detail: Optional[dict] = None,
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user=None,
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request=None,
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ip: str = "",
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user_agent: str = "",
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) -> Optional[AuditLog]:
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"""写一条审计日志。**任何异常都被吞掉**（旁路，不影响主业务）。
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request 可选：给了就自动提取 user / ip / user_agent。
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"""
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try:
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# 服务层通常没有 request：从 contextvar 兜底取（中间件注入）
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if request is None:
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try:
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from .context import current_request
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request = current_request()
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except Exception:
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request = None
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if request is not None:
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req_user = getattr(request, "user", None)
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if user is None and req_user is not None and getattr(req_user, "is_authenticated", False):
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user = req_user
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if not ip:
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xff = request.META.get("HTTP_X_FORWARDED_FOR", "")
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ip = (xff.split(",")[0].strip() if xff
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else request.META.get("REMOTE_ADDR", "")) or ""
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if not user_agent:
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user_agent = request.META.get("HTTP_USER_AGENT", "")[:255]
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return AuditLog.objects.create(
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tenant=tenant,
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user=user if (user is not None and getattr(user, "pk", None)) else None,
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action=_ACTION_TO_CHOICE.get(action, "update"),
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target_type=target_type[:64],
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target_id=str(target_id)[:64],
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detail={"business_action": action, **(detail or {})},
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ip=ip or None,
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user_agent=user_agent or "",
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)
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except Exception as exc: # 审计失败不能影响业务
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logger.warning("写审计日志失败（已忽略）: %s · action=%s target=%s",
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exc, action, target_type)
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return None
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# ------------------------------------------------------------
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# 便捷包装（业务侧调用这些，语义更清晰）
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# ------------------------------------------------------------
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def log_bill_posted(*, tenant, bill, user=None, request=None,
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extra: Optional[dict] = None) -> None:
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"""单据过账。"""
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log(
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tenant=tenant,
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action=ACTION_POST,
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target_type=bill.__class__.__name__,
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target_id=bill.bill_no,
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user=user,
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request=request,
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detail={
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"bill_no": bill.bill_no,
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"amount": str(getattr(bill, "total_amount", "")),
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"customer": getattr(getattr(bill, "customer", None), "code", ""),
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**(extra or {}),
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},
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)
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def log_bill_cancelled(*, tenant, bill, reason: str = "", user=None, request=None) -> None:
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"""单据作废/取消。"""
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log(
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tenant=tenant,
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action=ACTION_CANCEL,
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target_type=bill.__class__.__name__,
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target_id=getattr(bill, "bill_no", str(bill.pk)),
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user=user,
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request=request,
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detail={"reason": reason},
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)
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def log_force_release(*, tenant, kind: str, target: str, detail: dict,
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user=None, request=None) -> None:
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"""越过管控放行（信用超限 / 低于最低售价 / 超配额）。"""
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log(
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tenant=tenant,
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action=ACTION_FORCE,
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target_type=kind,
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target_id=target,
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user=user,
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request=request,
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detail=detail,
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)
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def log_price_override(*, tenant, product_code: str, from_price, to_price,
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bill_no: str = "", user=None, request=None) -> None:
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"""改价（记录原价与新价）。"""
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log(
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tenant=tenant,
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action=ACTION_PRICE_OVERRIDE,
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target_type="Product",
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target_id=product_code,
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user=user,
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request=request,
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detail={"bill_no": bill_no, "from": str(from_price), "to": str(to_price)},
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)
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def log_plan_change(*, tenant, from_plan: str, to_plan: str,
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user=None, request=None) -> None:
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log(
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tenant=tenant,
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action=ACTION_PLAN_CHANGE,
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target_type="Subscription",
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target_id=tenant.code if hasattr(tenant, "code") else str(tenant),
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user=user,
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request=request,
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detail={"from": from_plan, "to": to_plan},
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)
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def query_logs(tenant, *, target_type: str = "", target_id: str = "",
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action: str = "", limit: int = 100) -> list:
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"""按目标查审计轨迹（"这张单都发生了什么"）。"""
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qs = AuditLog.objects.filter(tenant=tenant)
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if target_type:
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qs = qs.filter(target_type=target_type)
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if target_id:
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qs = qs.filter(target_id=str(target_id))
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if action:
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qs = qs.filter(detail__business_action=action)
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return list(qs.order_by("-created_at")[:limit])
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