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# coding:utf-8
import datetime
import functools
import asyncio
from datetime import timedelta
from backoff._common import (_init_wait_gen, _maybe_call, _next_wait)
def _ensure_coroutine(coro_or_func):
if asyncio.iscoroutinefunction(coro_or_func):
return coro_or_func
else:
@functools.wraps(coro_or_func)
async def f(*args, **kwargs):
return coro_or_func(*args, **kwargs)
return f
def _ensure_coroutines(coros_or_funcs):
return [_ensure_coroutine(f) for f in coros_or_funcs]
async def _call_handlers(handlers,
*,
target, args, kwargs, tries, elapsed,
**extra):
details = {
'target': target,
'args': args,
'kwargs': kwargs,
'tries': tries,
'elapsed': elapsed,
}
details.update(extra)
for handler in handlers:
await handler(details)
def retry_predicate(target, wait_gen, predicate,
*,
max_tries, max_time, jitter,
on_success, on_backoff, on_giveup,
wait_gen_kwargs):
on_success = _ensure_coroutines(on_success)
on_backoff = _ensure_coroutines(on_backoff)
on_giveup = _ensure_coroutines(on_giveup)
# Easy to implement, please report if you need this.
assert not asyncio.iscoroutinefunction(max_tries)
assert not asyncio.iscoroutinefunction(jitter)
assert asyncio.iscoroutinefunction(target)
@functools.wraps(target)
async def retry(*args, **kwargs):
# update variables from outer function args
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 = await 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:
await _call_handlers(on_giveup, **details, value=ret)
break
try:
seconds = _next_wait(wait, ret, jitter, elapsed,
max_time_value)
except StopIteration:
await _call_handlers(on_giveup, **details, value=ret)
break
await _call_handlers(on_backoff, **details, value=ret,
wait=seconds)
# Note: there is no convenient way to pass explicit event
# loop to decorator, so here we assume that either default
# thread event loop is set and correct (it mostly is
# by default), or Python >= 3.5.3 or Python >= 3.6 is used
# where loop.get_event_loop() in coroutine guaranteed to
# return correct value.
# See for details:
# <https://groups.google.com/forum/#!topic/python-tulip/yF9C-rFpiKk>
# <https://bugs.python.org/issue28613>
await asyncio.sleep(seconds)
continue
else:
await _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):
on_success = _ensure_coroutines(on_success)
on_backoff = _ensure_coroutines(on_backoff)
on_giveup = _ensure_coroutines(on_giveup)
giveup = _ensure_coroutine(giveup)
# Easy to implement, please report if you need this.
assert not asyncio.iscoroutinefunction(max_tries)
assert not asyncio.iscoroutinefunction(jitter)
@functools.wraps(target)
async 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 = await target(*args, **kwargs)
except exception as e:
giveup_result = await giveup(e)
max_tries_exceeded = (tries == max_tries_value)
max_time_exceeded = (max_time_value is not None and
elapsed >= max_time_value)
if giveup_result or max_tries_exceeded or max_time_exceeded:
await _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:
await _call_handlers(on_giveup, **details, exception=e)
raise e
await _call_handlers(on_backoff, **details, wait=seconds,
exception=e)
# Note: there is no convenient way to pass explicit event
# loop to decorator, so here we assume that either default
# thread event loop is set and correct (it mostly is
# by default), or Python >= 3.5.3 or Python >= 3.6 is used
# where loop.get_event_loop() in coroutine guaranteed to
# return correct value.
# See for details:
# <https://groups.google.com/forum/#!topic/python-tulip/yF9C-rFpiKk>
# <https://bugs.python.org/issue28613>
await asyncio.sleep(seconds)
else:
await _call_handlers(on_success, **details)
return ret
return retry
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