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Edit: /opt/gsutil/third_party/cachetools/src/cachetools/func.py

"""`functools.lru_cache` compatible memoizing function decorators."""

__all__ = ("fifo_cache", "lfu_cache", "lru_cache", "mru_cache", "rr_cache", "ttl_cache")

import math
import random
import time

try:
    from threading import RLock
except ImportError:  # pragma: no cover
    from dummy_threading import RLock

from . import FIFOCache, LFUCache, LRUCache, MRUCache, RRCache, TTLCache
from . import cached
from . import keys

class _UnboundTTLCache(TTLCache):
    def __init__(self, ttl, timer):
        TTLCache.__init__(self, math.inf, ttl, timer)

@property
    def maxsize(self):
        return None

def _cache(cache, maxsize, typed):
    def decorator(func):
        key = keys.typedkey if typed else keys.hashkey
        wrapper = cached(cache=cache, key=key, lock=RLock(), info=True)(func)
        wrapper.cache_parameters = lambda: {"maxsize": maxsize, "typed": typed}
        return wrapper

return decorator

def fifo_cache(maxsize=128, typed=False):
    """Decorator to wrap a function with a memoizing callable that saves
    up to `maxsize` results based on a First In First Out (FIFO)
    algorithm.

"""
    if maxsize is None:
        return _cache({}, None, typed)
    elif callable(maxsize):
        return _cache(FIFOCache(128), 128, typed)(maxsize)
    else:
        return _cache(FIFOCache(maxsize), maxsize, typed)

def lfu_cache(maxsize=128, typed=False):
    """Decorator to wrap a function with a memoizing callable that saves
    up to `maxsize` results based on a Least Frequently Used (LFU)
    algorithm.

"""
    if maxsize is None:
        return _cache({}, None, typed)
    elif callable(maxsize):
        return _cache(LFUCache(128), 128, typed)(maxsize)
    else:
        return _cache(LFUCache(maxsize), maxsize, typed)

def lru_cache(maxsize=128, typed=False):
    """Decorator to wrap a function with a memoizing callable that saves
    up to `maxsize` results based on a Least Recently Used (LRU)
    algorithm.

"""
    if maxsize is None:
        return _cache({}, None, typed)
    elif callable(maxsize):
        return _cache(LRUCache(128), 128, typed)(maxsize)
    else:
        return _cache(LRUCache(maxsize), maxsize, typed)

def mru_cache(maxsize=128, typed=False):
    """Decorator to wrap a function with a memoizing callable that saves
    up to `maxsize` results based on a Most Recently Used (MRU)
    algorithm.
    """
    from warnings import warn

warn("@mru_cache is deprecated", DeprecationWarning, stacklevel=2)

if maxsize is None:
        return _cache({}, None, typed)
    elif callable(maxsize):
        return _cache(MRUCache(128), 128, typed)(maxsize)
    else:
        return _cache(MRUCache(maxsize), maxsize, typed)

def rr_cache(maxsize=128, choice=random.choice, typed=False):
    """Decorator to wrap a function with a memoizing callable that saves
    up to `maxsize` results based on a Random Replacement (RR)
    algorithm.

"""
    if maxsize is None:
        return _cache({}, None, typed)
    elif callable(maxsize):
        return _cache(RRCache(128, choice), 128, typed)(maxsize)
    else:
        return _cache(RRCache(maxsize, choice), maxsize, typed)

def ttl_cache(maxsize=128, ttl=600, timer=time.monotonic, typed=False):
    """Decorator to wrap a function with a memoizing callable that saves
    up to `maxsize` results based on a Least Recently Used (LRU)
    algorithm with a per-item time-to-live (TTL) value.
    """
    if maxsize is None:
        return _cache(_UnboundTTLCache(ttl, timer), None, typed)
    elif callable(maxsize):
        return _cache(TTLCache(128, ttl, timer), 128, typed)(maxsize)
    else:
        return _cache(TTLCache(maxsize, ttl, timer), maxsize, typed)

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