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# Copyright (C) 2012- Takafumi Arakaki
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import logging
import itertools
import functools
import threading
import warnings
from .py3compat import Queue
def func_call_as_str(name, *args, **kwds):
"""
Return arguments and keyword arguments as formatted string
>>> func_call_as_str('f', 1, 2, a=1)
'f(1, 2, a=1)'
"""
return '{0}({1})'.format(
name,
', '.join(itertools.chain(
map('{0!r}'.format, args),
map('{0[0]!s}={0[1]!r}'.format, sorted(kwds.items())))))
def autolog(level):
if isinstance(level, str):
level = getattr(logging, level.upper())
def wrapper(method):
@functools.wraps(method)
def new_method(self, *args, **kwds):
funcname = ".".join([self.__class__.__name__, method.__name__])
self.logger.log(level, "(AutoLog) Called: %s",
func_call_as_str(funcname, *args, **kwds))
ret = method(self, *args, **kwds)
self.logger.log(level, "(AutoLog) Returns: %s(...) = %r",
funcname, ret)
return ret
return new_method
return wrapper
def deprecated(func):
"""
Decorator for marking function as deprecated
"""
@functools.wraps(func)
def wrapper(*args, **kwargs):
warnings.warn(
'{0} is deprecated.'.format(func.__name__),
category=DeprecationWarning,
stacklevel=2,
)
return func(*args, **kwargs)
return wrapper
def newname(template):
global _counter
_counter = _counter + 1
return template.format(_counter)
_counter = 0
def newthread(template="EPCThread-{0}", **kwds):
"""
Instantiate :class:`threading.Thread` with an appropriate name.
"""
if not isinstance(template, str):
template = '{0}.{1}-{{0}}'.format(template.__module__,
template.__class__.__name__)
return threading.Thread(
name=newname(template), **kwds)
class ThreadedIterator(object):
def __init__(self, iterable):
self._original_iterable = iterable
self.queue = Queue.Queue()
self.thread = newthread(self, target=self._target)
self.thread.daemon = True
self._sentinel = object()
self.thread.start()
def _target(self):
for result in self._original_iterable:
self.queue.put(result)
self.stop()
def stop(self):
self.queue.put(self._sentinel)
def __iter__(self):
return self
def __next__(self):
got = self.queue.get()
if got is self._sentinel:
raise StopIteration
return got
next = __next__ # for PY2
def callwith(context_manager):
"""
A decorator to wrap execution of function with a context manager.
"""
def decorator(func):
@functools.wraps(func)
def wrapper(*args, **kwds):
with context_manager:
return func(*args, **kwds)
return wrapper
return decorator
def _define_thread_safe_methods(methodnames, lockname):
def define(cls, name):
def wrapper(self, *args, **kwds):
with getattr(self, lockname):
return method(self, *args, **kwds)
method = getattr(cls, name)
setattr(cls, name, wrapper)
def decorator(cls):
for name in methodnames:
define(cls, name)
return cls
return decorator
@_define_thread_safe_methods(
['__getitem__', '__setitem__', '__delitem__', 'pop'], '_lock')
class LockingDict(dict):
def __init__(self, *args, **kwds):
super(LockingDict, self).__init__(*args, **kwds)
self._lock = threading.Lock()
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