42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
#
|
|
# Copyright 2014 Canonical Ltd.
|
|
#
|
|
# Authors:
|
|
# Edward Hope-Morley <opentastic@gmail.com>
|
|
#
|
|
|
|
import time
|
|
|
|
from charmhelpers.core.hookenv import (
|
|
log,
|
|
INFO,
|
|
)
|
|
|
|
|
|
def retry_on_exception(num_retries, base_delay=0, exc_type=Exception):
|
|
"""If the decorated function raises exception exc_type, allow num_retries
|
|
retry attempts before raise the exception.
|
|
"""
|
|
def _retry_on_exception_inner_1(f):
|
|
def _retry_on_exception_inner_2(*args, **kwargs):
|
|
retries = num_retries
|
|
multiplier = 1
|
|
while True:
|
|
try:
|
|
return f(*args, **kwargs)
|
|
except exc_type:
|
|
if not retries:
|
|
raise
|
|
|
|
delay = base_delay * multiplier
|
|
multiplier += 1
|
|
log("Retrying '%s' %d more times (delay=%s)" %
|
|
(f.__name__, retries, delay), level=INFO)
|
|
retries -= 1
|
|
if delay:
|
|
time.sleep(delay)
|
|
|
|
return _retry_on_exception_inner_2
|
|
|
|
return _retry_on_exception_inner_1
|