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# -*- coding: utf-8 -*-
# Copyright (C) 2015 Yahoo! Inc. All Rights Reserved.
#
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import logging
import time
from monotonic import monotonic as now # noqa
# log level for low-level debugging
BLATHER = 5
LOG = logging.getLogger(__name__)
def pick_first_not_none(*values):
"""Returns first of values that is *not* None (or None if all are/were)."""
for val in values:
if val is not None:
return val
return None
class LockStack(object):
"""Simple lock stack to get and release many locks.
An instance of this should **not** be used by many threads at the
same time, as the stack that is maintained will be corrupted and
invalid if that is attempted.
"""
def __init__(self, logger=None):
self._stack = []
self._logger = pick_first_not_none(logger, LOG)
def acquire_lock(self, lock):
gotten = lock.acquire()
if gotten:
self._stack.append(lock)
return gotten
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, exc_tb):
am_left = len(self._stack)
tot_am = am_left
while self._stack:
lock = self._stack.pop()
try:
lock.release()
except Exception:
self._logger.exception("Failed releasing lock %s from lock"
" stack with %s locks", am_left, tot_am)
am_left -= 1
class RetryAgain(Exception):
"""Exception to signal to retry helper to try again."""
class Retry(object):
"""A little retry helper object."""
def __init__(self, delay, max_delay,
sleep_func=time.sleep, watch=None):
self.delay = delay
self.attempts = 0
self.max_delay = max_delay
self.sleep_func = sleep_func
self.watch = watch
def __call__(self, fn, *args, **kwargs):
while True:
self.attempts += 1
try:
return fn(*args, **kwargs)
except RetryAgain:
maybe_delay = self.attempts * self.delay
if maybe_delay < self.max_delay:
actual_delay = maybe_delay
else:
actual_delay = self.max_delay
actual_delay = max(0.0, actual_delay)
if self.watch is not None:
leftover = self.watch.leftover()
if leftover is not None and leftover < actual_delay:
actual_delay = leftover
self.sleep_func(actual_delay)
class StopWatch(object):
"""A really basic stop watch."""
def __init__(self, duration=None):
self.duration = duration
self.started_at = None
self.stopped_at = None
def leftover(self):
if self.duration is None:
return None
return max(0.0, self.duration - self.elapsed())
def elapsed(self):
if self.stopped_at is not None:
end_time = self.stopped_at
else:
end_time = now()
return max(0.0, end_time - self.started_at)
def __enter__(self):
self.start()
return self
def __exit__(self, exc_type, exc_value, exc_tb):
self.stopped_at = now()
def start(self):
self.started_at = now()
self.stopped_at = None
def expired(self):
if self.duration is None:
return False
else:
return self.elapsed() > self.duration