53
53
return _retry_on_exception_inner_2
55
55
return _retry_on_exception_inner_1
58
def retry_on_predicate(num_retries, predicate_fun, base_delay=0):
59
"""Retry based on return value
61
The return value of the decorated function is passed to the given predicate_fun. If the
62
result of the predicate is False, retry the decorated function up to num_retries times
64
An exponential backoff up to base_delay^num_retries seconds can be introduced by setting
65
base_delay to a nonzero value. The default is to run with a zero (i.e. no) delay
67
:param num_retries: Max. number of retries to perform
68
:type num_retries: int
69
:param predicate_fun: Predicate function to determine if a retry is necessary
70
:type predicate_fun: callable
71
:param base_delay: Starting value in seconds for exponential delay, defaults to 0 (no delay)
72
:type base_delay: float
74
def _retry_on_pred_inner_1(f):
75
def _retry_on_pred_inner_2(*args, **kwargs):
80
result = f(*args, **kwargs)
81
if predicate_fun(result) or retries <= 0:
85
log("Result {}, retrying '{}' {} more times (delay={})".format(
86
result, f.__name__, retries, delay), level=INFO)
91
return _retry_on_pred_inner_2
93
return _retry_on_pred_inner_1
added
removed
charmhelpers/core/decorators.py
