103 lines
2.9 KiB
Python
103 lines
2.9 KiB
Python
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import threading
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from collections import OrderedDict
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from contextlib import contextmanager
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from typing import Any, List, Tuple, Union, Generator
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from langchain.embeddings.base import Embeddings
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from langchain.vectorstores.faiss import FAISS
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from chatchat.utils import build_logger
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logger = build_logger()
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class ThreadSafeObject:
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def __init__(
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self, key: Union[str, Tuple], obj: Any = None, pool: "CachePool" = None
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):
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self._obj = obj
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self._key = key
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self._pool = pool
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self._lock = threading.RLock()
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self._loaded = threading.Event()
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def __repr__(self) -> str:
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cls = type(self).__name__
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return f"<{cls}: key: {self.key}, obj: {self._obj}>"
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@property
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def key(self):
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return self._key
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@contextmanager
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def acquire(self, owner: str = "", msg: str = "") -> Generator[None, None, FAISS]:
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owner = owner or f"thread {threading.get_native_id()}"
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try:
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self._lock.acquire()
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if self._pool is not None:
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self._pool._cache.move_to_end(self.key)
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logger.debug(f"{owner} 开始操作：{self.key}。{msg}")
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yield self._obj
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finally:
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logger.debug(f"{owner} 结束操作：{self.key}。{msg}")
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self._lock.release()
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def start_loading(self):
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self._loaded.clear()
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def finish_loading(self):
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self._loaded.set()
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def wait_for_loading(self):
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self._loaded.wait()
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@property
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def obj(self):
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return self._obj
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@obj.setter
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def obj(self, val: Any):
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self._obj = val
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class CachePool:
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def __init__(self, cache_num: int = -1):
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self._cache_num = cache_num
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self._cache = OrderedDict()
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self.atomic = threading.RLock()
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def keys(self) -> List[str]:
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return list(self._cache.keys())
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def _check_count(self):
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if isinstance(self._cache_num, int) and self._cache_num > 0:
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while len(self._cache) > self._cache_num:
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self._cache.popitem(last=False)
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def get(self, key: str) -> ThreadSafeObject:
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if cache := self._cache.get(key):
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cache.wait_for_loading()
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return cache
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def set(self, key: str, obj: ThreadSafeObject) -> ThreadSafeObject:
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self._cache[key] = obj
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self._check_count()
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return obj
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def pop(self, key: str = None) -> ThreadSafeObject:
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if key is None:
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return self._cache.popitem(last=False)
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else:
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return self._cache.pop(key, None)
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def acquire(self, key: Union[str, Tuple], owner: str = "", msg: str = ""):
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cache = self.get(key)
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if cache is None:
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raise RuntimeError(f"请求的资源 {key} 不存在")
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elif isinstance(cache, ThreadSafeObject):
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self._cache.move_to_end(key)
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return cache.acquire(owner=owner, msg=msg)
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else:
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return cache
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