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# Copyright (C) 2015 Yahoo! Inc. 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 contextlib
import inspect
import multiprocessing
import sys
import threading
from time import monotonic
import traceback
now = monotonic
try:
import eventlet as _eventlet # noqa
EVENTLET_AVAILABLE = True
except ImportError:
EVENTLET_AVAILABLE = False
class WorkItem:
"""A thing to be executed by a executor."""
def __init__(self, future, fn, args, kwargs):
self.future = future
self.fn = fn
self.args = args
self.kwargs = kwargs
def run(self):
if not self.future.set_running_or_notify_cancel():
return
try:
result = self.fn(*self.args, **self.kwargs)
except SystemExit as e:
try:
self.fail()
finally:
raise e
except BaseException:
self.fail()
else:
self.future.set_result(result)
def fail(self, exc_info=None):
exc_type, exc_value, exc_tb = exc_info or sys.exc_info()
try:
self.future.set_exception(exc_value)
finally:
if exc_info is None:
del exc_type, exc_value, exc_tb
class Failure:
"""Object that captures a exception (and its associated information)."""
def __init__(self, retain_tb):
exc_info = sys.exc_info()
if not any(exc_info):
raise RuntimeError("No active exception being handled, can"
" not create a failure which represents"
" nothing")
try:
if retain_tb:
self.exc_info = tuple(exc_info)
self.traceback = None
else:
self.exc_info = (exc_info[0], exc_info[1], None)
self.traceback = "".join(traceback.format_exception(*exc_info))
finally:
del exc_info
@property
def exc_type(self):
return self.exc_info[0]
@property
def exc_value(self):
return self.exc_info[1]
def get_callback_name(cb):
"""Tries to get a callbacks fully-qualified name.
If no name can be produced ``repr(cb)`` is called and returned.
"""
segments = []
try:
segments.append(cb.__qualname__)
except AttributeError:
try:
segments.append(cb.__name__)
if inspect.ismethod(cb):
try:
# This attribute doesn't exist on py3.x or newer, so
# we optionally ignore it... (on those versions of
# python `__qualname__` should have been found anyway).
segments.insert(0, cb.im_class.__name__)
except AttributeError:
pass
except AttributeError:
pass
if not segments:
return repr(cb)
else:
try:
# When running under sphinx it appears this can be none?
if cb.__module__:
segments.insert(0, cb.__module__)
except AttributeError:
pass
return ".".join(segments)
def get_optimal_thread_count(default=5):
"""Try to guess optimal thread count for current system."""
try:
return multiprocessing.cpu_count() * 5
except NotImplementedError:
return default
def get_optimal_process_count(default=1):
"""Try to guess optimal process count for current system."""
try:
return multiprocessing.cpu_count()
except NotImplementedError:
return default
class Barrier:
"""A class that ensures active <= 0 occur before unblocking."""
def __init__(self, cond_cls=threading.Condition):
self._active = 0
self._cond = cond_cls()
@property
def active(self):
return self._active
def incr(self):
with self._cond:
self._active += 1
self._cond.notify_all()
@contextlib.contextmanager
def decr_cm(self):
with self._cond:
self._active -= 1
try:
yield self._active
finally:
self._cond.notify_all()
def decr(self):
with self._cond:
self._active -= 1
self._cond.notify_all()
def wait(self):
with self._cond:
while self._active > 0:
self._cond.wait()
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