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379 lines
14 KiB
Python
379 lines
14 KiB
Python
import asyncio
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from collections import deque
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from collections.abc import Iterable
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import contextlib
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import time
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from typing import Any, ClassVar
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from typing_extensions import Self
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from nonebot_plugin_apscheduler import scheduler
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from tortoise.backends.base.client import BaseDBAsyncClient
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from tortoise.exceptions import IntegrityError, MultipleObjectsReturned
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from tortoise.models import Model as TortoiseModel
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from tortoise.transactions import in_transaction
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from zhenxun.services.cache import CacheRoot
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from zhenxun.services.log import logger
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from zhenxun.utils.enum import DbLockType
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from .config import LOG_COMMAND, db_model
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from .utils import with_db_timeout
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start_time = time.time()
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class ModelCallMetrics:
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"""记录Model数据库方法调用次数（30秒窗口内，按模块与方法分组）"""
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window_seconds: ClassVar[float] = 30.0
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_call_history: ClassVar[dict[str, dict[str, deque[float]]]] = {}
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@classmethod
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def _trim(cls, module: str, method: str, now: float | None = None):
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"""移除指定模块/方法超出时间窗口的记录"""
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module_hist = cls._call_history.get(module)
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if not module_hist or method not in module_hist:
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return
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now = time.monotonic() if now is None else now
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time_limit = now - cls.window_seconds
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history = module_hist[method]
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while history and history[0] < time_limit:
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history.popleft()
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@classmethod
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def record_call(cls, module: str, method: str):
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"""记录一次数据库方法调用（按模块与方法）"""
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if time.time() - start_time < 20:
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return
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now = time.monotonic()
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method_hist = cls._call_history.setdefault(module, {})
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history = method_hist.setdefault(method, deque())
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history.append(now)
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cls._trim(module, method, now)
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@classmethod
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def get_count(cls, module: str, method: str) -> int:
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"""获取指定模块指定方法在窗口内的调用次数"""
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cls._trim(module, method)
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return len(cls._call_history.get(module, {}).get(method, ()))
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@classmethod
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def get_method_counts(cls, module: str) -> dict[str, int]:
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"""获取指定模块各方法在窗口内的调用统计"""
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methods = cls._call_history.get(module, {})
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return {m: cls.get_count(module, m) for m in list(methods)}
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@classmethod
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def get_all_counts(cls) -> dict[str, dict[str, int]]:
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"""获取所有模块各方法在窗口内的调用统计"""
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modules = list(cls._call_history)
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return {module: cls.get_method_counts(module) for module in modules}
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class Model(TortoiseModel):
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"""
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增强的ORM基类，解决锁嵌套问题
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"""
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sem_data: ClassVar[dict[str, dict[str, asyncio.Semaphore]]] = {}
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_current_locks: ClassVar[dict[int, DbLockType]] = {} # 跟踪当前协程持有的锁
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def __init_subclass__(cls, **kwargs):
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super().__init_subclass__(**kwargs)
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if cls.__module__ not in db_model.models:
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db_model.models.append(cls.__module__)
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if func := getattr(cls, "_run_script", None):
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db_model.script_method.append((cls.__module__, func))
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@classmethod
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def get_cache_type(cls) -> str | None:
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"""获取缓存类型"""
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return getattr(cls, "cache_type", None)
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@classmethod
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def get_cache_key_field(cls) -> str | tuple[str]:
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"""获取缓存键字段"""
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return getattr(cls, "cache_key_field", "id")
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@classmethod
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def get_cache_key(cls, instance) -> str | None:
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"""获取缓存键
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参数:
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instance: 模型实例
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返回:
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str | None: 缓存键，如果无法获取则返回None
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"""
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from zhenxun.services.cache.config import COMPOSITE_KEY_SEPARATOR
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key_field = cls.get_cache_key_field()
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if isinstance(key_field, tuple):
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# 多字段主键
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key_parts = []
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for field in key_field:
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if hasattr(instance, field):
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value = getattr(instance, field, None)
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key_parts.append(value if value is not None else "")
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else:
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# 如果缺少任何必要的字段，返回None
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key_parts.append("")
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# 如果没有有效参数，返回None
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return COMPOSITE_KEY_SEPARATOR.join(key_parts) if key_parts else None
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elif hasattr(instance, key_field):
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value = getattr(instance, key_field, None)
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return str(value) if value is not None else None
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return None
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@classmethod
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def get_semaphore(cls, lock_type: DbLockType):
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enable_lock = getattr(cls, "enable_lock", None)
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if not enable_lock or lock_type not in enable_lock:
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return None
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if cls.__name__ not in cls.sem_data:
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cls.sem_data[cls.__name__] = {}
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if lock_type not in cls.sem_data[cls.__name__]:
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cls.sem_data[cls.__name__][lock_type] = asyncio.Semaphore(1)
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return cls.sem_data[cls.__name__][lock_type]
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@classmethod
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def _require_lock(cls, lock_type: DbLockType) -> bool:
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"""检查是否需要真正加锁"""
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task_id = id(asyncio.current_task())
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return cls._current_locks.get(task_id) != lock_type
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@classmethod
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@contextlib.asynccontextmanager
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async def _lock_context(cls, lock_type: DbLockType):
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"""带重入检查的锁上下文"""
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task_id = id(asyncio.current_task())
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need_lock = cls._require_lock(lock_type)
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if need_lock and (sem := cls.get_semaphore(lock_type)):
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cls._current_locks[task_id] = lock_type
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async with sem:
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yield
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cls._current_locks.pop(task_id, None)
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else:
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yield
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@classmethod
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async def create(
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cls, using_db: BaseDBAsyncClient | None = None, **kwargs: Any
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) -> Self:
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"""创建数据（使用CREATE锁）"""
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# ModelCallMetrics.record_call(cls.__module__, "create")
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async with cls._lock_context(DbLockType.CREATE):
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# 直接调用父类的_create方法避免触发save的锁
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result = await super().create(using_db=using_db, **kwargs)
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if cache_type := cls.get_cache_type():
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await CacheRoot.invalidate_cache(cache_type, cls.get_cache_key(result))
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return result
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@classmethod
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async def get_or_create(
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cls,
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defaults: dict | None = None,
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using_db: BaseDBAsyncClient | None = None,
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**kwargs: Any,
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) -> tuple[Self, bool]:
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"""获取或创建数据（无锁版本，依赖数据库约束）"""
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ModelCallMetrics.record_call(cls.__module__, "get_or_create")
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result = await super().get_or_create(
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defaults=defaults, using_db=using_db, **kwargs
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)
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if cache_type := cls.get_cache_type():
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await CacheRoot.invalidate_cache(cache_type, cls.get_cache_key(result[0]))
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return result
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@classmethod
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async def update_or_create(
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cls,
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defaults: dict | None = None,
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using_db: BaseDBAsyncClient | None = None,
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**kwargs: Any,
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) -> tuple[Self, bool]:
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"""更新或创建数据（使用UPSERT锁）"""
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ModelCallMetrics.record_call(cls.__module__, "update_or_create")
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async with cls._lock_context(DbLockType.UPSERT):
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try:
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# 先尝试更新（带行锁）
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async with in_transaction():
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if obj := await cls.filter(**kwargs).select_for_update().first():
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await obj.update_from_dict(defaults or {})
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await obj.save()
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result = (obj, False)
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else:
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# 创建时不重复加锁
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result = await cls.create(**kwargs, **(defaults or {})), True
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if cache_type := cls.get_cache_type():
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await CacheRoot.invalidate_cache(
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cache_type, cls.get_cache_key(result[0])
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)
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return result
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except IntegrityError:
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# 处理极端情况下的唯一约束冲突
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obj = await cls.get(**kwargs)
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return obj, False
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async def save(
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self,
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using_db: BaseDBAsyncClient | None = None,
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update_fields: Iterable[str] | None = None,
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force_create: bool = False,
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force_update: bool = False,
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):
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"""保存数据（根据操作类型自动选择锁）"""
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ModelCallMetrics.record_call(self.__class__.__module__, "save")
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lock_type = (
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DbLockType.CREATE
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if getattr(self, "id", None) is None
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else DbLockType.UPDATE
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)
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async with self._lock_context(lock_type):
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await super().save(
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using_db=using_db,
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update_fields=update_fields,
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force_create=force_create,
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force_update=force_update,
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)
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if cache_type := getattr(self, "cache_type", None):
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await CacheRoot.invalidate_cache(
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cache_type, self.__class__.get_cache_key(self)
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)
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async def delete(self, using_db: BaseDBAsyncClient | None = None):
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ModelCallMetrics.record_call(self.__class__.__module__, "delete")
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cache_type = getattr(self, "cache_type", None)
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key = self.__class__.get_cache_key(self) if cache_type else None
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# 执行删除操作
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await super().delete(using_db=using_db)
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# 清除缓存
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if cache_type:
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await CacheRoot.invalidate_cache(cache_type, key)
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@classmethod
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async def safe_get_or_none(
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cls,
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*args,
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using_db: BaseDBAsyncClient | None = None,
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clean_duplicates: bool = True,
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**kwargs: Any,
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) -> Self | None:
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"""安全地获取一条记录或None，处理存在多个记录时返回最新的那个
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注意，默认会删除重复的记录，仅保留最新的
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参数:
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*args: 查询参数
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using_db: 数据库连接
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clean_duplicates: 是否删除重复的记录，仅保留最新的
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**kwargs: 查询参数
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返回:
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Self | None: 查询结果，如果不存在返回None
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"""
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ModelCallMetrics.record_call(cls.__module__, "safe_get_or_none")
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try:
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# 先尝试使用 get_or_none 获取单个记录
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try:
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return await with_db_timeout(
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cls.get_or_none(*args, using_db=using_db, **kwargs),
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operation=f"{cls.__name__}.get_or_none",
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source="DataBaseModel",
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)
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except MultipleObjectsReturned:
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# 如果出现多个记录的情况，进行特殊处理
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logger.warning(
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f"{cls.__name__} safe_get_or_none 发现多个记录: {kwargs}",
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LOG_COMMAND,
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)
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# 查询所有匹配记录
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records = await with_db_timeout(
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cls.filter(*args, **kwargs).all(),
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operation=f"{cls.__name__}.filter.all",
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source="DataBaseModel",
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)
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if not records:
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return None
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# 如果需要清理重复记录
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if clean_duplicates and hasattr(records[0], "id"):
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# 按 id 排序
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records = sorted(
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records, key=lambda x: getattr(x, "id", 0), reverse=True
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)
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for record in records[1:]:
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try:
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await with_db_timeout(
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record.delete(),
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operation=f"{cls.__name__}.delete_duplicate",
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source="DataBaseModel",
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)
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logger.info(
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f"{cls.__name__} 删除重复记录:"
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f" id={getattr(record, 'id', None)}",
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LOG_COMMAND,
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)
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except Exception as del_e:
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logger.error(f"删除重复记录失败: {del_e}")
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return records[0]
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# 如果不需要清理或没有 id 字段，则返回最新的记录
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if hasattr(cls, "id"):
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return await with_db_timeout(
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cls.filter(*args, **kwargs).order_by("-id").first(),
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operation=f"{cls.__name__}.filter.order_by.first",
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source="DataBaseModel",
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)
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# 如果没有 id 字段，则返回第一个记录
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return await with_db_timeout(
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cls.filter(*args, **kwargs).first(),
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operation=f"{cls.__name__}.filter.first",
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source="DataBaseModel",
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)
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except asyncio.TimeoutError:
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logger.error(
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f"数据库操作超时: {cls.__name__}.safe_get_or_none", LOG_COMMAND
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)
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return None
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except Exception as e:
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# 其他类型的错误则继续抛出
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logger.error(
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f"数据库操作异常: {cls.__name__}.safe_get_or_none, {e!s}", LOG_COMMAND
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)
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raise
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@scheduler.scheduled_job(
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"interval",
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seconds=10,
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)
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async def _():
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counts = ModelCallMetrics.get_all_counts()
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if not counts:
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return
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total_calls = sum(sum(method_counts.values()) for method_counts in counts.values())
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lines: list[str] = ["Model 数据库方法调用次数（最近30秒）:", f"总计: {total_calls}"]
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for module in sorted(counts.keys()):
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lines.append(f"- module: {module}")
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method_counts = counts[module]
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if not method_counts:
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lines.append(" (no calls)")
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continue
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lines.extend(
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f" {method}: {method_counts[method]}"
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for method in sorted(method_counts.keys())
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)
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logger.debug("\n".join(lines))
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