Usable Circuit Breaker pattern implementation.
Install
$ pip install breakersUsage
import functools
from breakers import Breaker
def circuit_breaker(time_span=20000, unit=1000, calls_limit=10,
error_limit=0.5, retry_time=10000):
def deco(func):
# Create breaker
if not hasattr(func, '__breaker__'):
func.__breaker__ = Breaker(time_span, unit, calls_limit,
error_limit, retry_time)
breaker = func.__breaker__
@functools.wraps(func)
def wraps(*args, **kwargs):
if not breaker.is_allow():
raise RuntimeError('Circuit breaker')
exc = None
try:
return func(*args, **kwargs)
except Exception as e:
exc = e
raise
finally:
if exc:
breaker.add_failure(1)
else:
breaker.add_success(1)
return wraps
return deco
@circuit_breaker()
def f():
import random
if random.randint(1, 4) in (1, 2):
raise ValueError
return 'succeed'1 maintainer
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