Comments (6)
"throttle" seems to be a good one-word name. Other considered: "meter", "pace", "tempo", "rhythm". Some googling shows that throttling requests is more common than other terms.
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See also the stampede lock code in the diskcache directory.
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Tested pseudocode:
def throttle(count, seconds):
"""Throttle function calls to `count` times per `seconds`.
"""
rate = count / seconds
def decorator(func):
last = time.time()
tally = count
@functools.wraps(func)
def wrapper(*args, **kwargs):
nonlocal last, tally
while True:
now = time.time()
extent = now - last
last = now
tally += extent * rate
if tally > count:
tally = count - 1
break
elif tally < 1:
time.sleep((1 - tally) / rate)
else:
tally -= 1
break
func(*args, **kwargs)
return wrapper
return decorator
I'm doubtful this can be made multi-threaded with the atomic methods provided by diskcache. But maybe it can be good-enough.
from python-diskcache.
Design notes: throttle should be method on Cache objects that accepts key, count and seconds. The throttle method should use a transaction to calculate how long to sleep before asking again. If returned value is zero then perform action immediately.
Maybe there should be a Throttler object that uses the throttle method instead.
FanoutCache should also have throttle method but acts instead as decorator and handles retries for Timeout error. Django Cache ha same method that behaves identically.
Maybe have rate-limit method and throttle. One acts as low-level sleeper function, other acts as decorator. Yes, better to have separate methods.
from python-diskcache.
It would be nice to have an API for measuring the rate of something. Use case idea: better health checks. I think it could be implemented as a leaky-bucket with an un-bounded size. Return value is bucket size. Measure in calls per second.
from python-diskcache.
This is now included in the recipes. Commit reference bf7196d
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Related Issues (20)
- Mark the distributed package as typed HOT 1
- Long-lived cache management HOT 2
- PR for fork deadlock HOT 1
- Can this awasome add the range selection Feature? HOT 2
- PicklingError: logger cannot be pickled HOT 6
- Q: Config for in-memory shared cache HOT 8
- Use local OS' path separator HOT 3
- Cannot change JSONDisk compression level HOT 2
- Memoize key isn't always invertible
- support pandas.DataFrame in cache.memoize()
- Protect Against Repeated KeyboardInterrupt Signals HOT 1
- Error during reset
- Custom serializer cannot return "None"
- Bug with pandas 2.0 HOT 1
- Retrieve cached file path instead of bytes HOT 1
- Comparison with RocksDict HOT 3
- ImportError: DLL load failed while importing _sqlite3: The specified module could not be found.
- Add typing HOT 1
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from python-diskcache.