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# coding:utf-8
import datetime
import functools
import time
from datetime import timedelta
from backoff._common import (_init_wait_gen, _maybe_call, _next_wait)
def _call_handlers(hdlrs, target, args, kwargs, tries, elapsed, **extra):
details = {
'target': target,
'args': args,
'kwargs': kwargs,
'tries': tries,
'elapsed': elapsed,
}
details.update(extra)
for hdlr in hdlrs:
hdlr(details)
def retry_predicate(target, wait_gen, predicate,
*,
max_tries, max_time, jitter,
on_success, on_backoff, on_giveup,
wait_gen_kwargs):
@functools.wraps(target)
def retry(*args, **kwargs):
max_tries_value = _maybe_call(max_tries)
max_time_value = _maybe_call(max_time)
tries = 0
start = datetime.datetime.now()
wait = _init_wait_gen(wait_gen, wait_gen_kwargs)
while True:
tries += 1
elapsed = timedelta.total_seconds(datetime.datetime.now() - start)
details = {
"target": target,
"args": args,
"kwargs": kwargs,
"tries": tries,
"elapsed": elapsed,
}
ret = target(*args, **kwargs)
if predicate(ret):
max_tries_exceeded = (tries == max_tries_value)
max_time_exceeded = (max_time_value is not None and
elapsed >= max_time_value)
if max_tries_exceeded or max_time_exceeded:
_call_handlers(on_giveup, **details, value=ret)
break
try:
seconds = _next_wait(wait, ret, jitter, elapsed,
max_time_value)
except StopIteration:
_call_handlers(on_giveup, **details)
break
_call_handlers(on_backoff, **details,
value=ret, wait=seconds)
time.sleep(seconds)
continue
else:
_call_handlers(on_success, **details, value=ret)
break
return ret
return retry
def retry_exception(target, wait_gen, exception,
*,
max_tries, max_time, jitter, giveup,
on_success, on_backoff, on_giveup, raise_on_giveup,
wait_gen_kwargs):
@functools.wraps(target)
def retry(*args, **kwargs):
max_tries_value = _maybe_call(max_tries)
max_time_value = _maybe_call(max_time)
tries = 0
start = datetime.datetime.now()
wait = _init_wait_gen(wait_gen, wait_gen_kwargs)
while True:
tries += 1
elapsed = timedelta.total_seconds(datetime.datetime.now() - start)
details = {
"target": target,
"args": args,
"kwargs": kwargs,
"tries": tries,
"elapsed": elapsed,
}
try:
ret = target(*args, **kwargs)
except exception as e:
max_tries_exceeded = (tries == max_tries_value)
max_time_exceeded = (max_time_value is not None and
elapsed >= max_time_value)
if giveup(e) or max_tries_exceeded or max_time_exceeded:
_call_handlers(on_giveup, **details, exception=e)
if raise_on_giveup:
raise
return None
try:
seconds = _next_wait(wait, e, jitter, elapsed,
max_time_value)
except StopIteration:
_call_handlers(on_giveup, **details, exception=e)
raise e
_call_handlers(on_backoff, **details, wait=seconds,
exception=e)
time.sleep(seconds)
else:
_call_handlers(on_success, **details)
return ret
return retry
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