速率限制python装饰器
我发现了基于redis类的速率限制python decorator。我如何编写一个类似的装饰器,它只使用标准库中可用的、可按如下方式使用的内容速率限制python装饰器,python,algorithm,decorator,python-decorators,rate-limiting,Python,Algorithm,Decorator,Python Decorators,Rate Limiting,我发现了基于redis类的速率限制python decorator。我如何编写一个类似的装饰器,它只使用标准库中可用的、可按如下方式使用的内容 def ratelimit(limit, every): # You can use a threading.Semaphore to count and block the requests that are exceeding the limit, in combination with threading.Timer to schedule
def ratelimit(limit, every):
# You can use a threading.Semaphore
to count and block the requests that are exceeding the limit, in combination with threading.Timer
to schedule a function that releases the semaphore.
from threading import Semaphore, Timer
from functools import wraps
def ratelimit(limit, every):
def limitdecorator(fn):
semaphore = Semaphore(limit)
@wraps(fn)
def wrapper(*args, **kwargs):
semaphore.acquire()
try:
return fn(*args, **kwargs)
finally: # don't catch but ensure semaphore release
timer = Timer(every, semaphore.release)
timer.setDaemon(True) # allows the timer to be canceled on exit
timer.start()
return wrapper
return limitdecorator
def rate limit(限制,每个):
#您可以使用来统计和阻止超出限制的请求,并结合调度释放信号量的函数
我扩展了这个想法,并在PyPI上发布了一个名为的库。如果包装函数引发异常,则不会释放信号量。您可以使用try..finally
子句来确保发生这种情况。