mirror of https://github.com/ansible/ansible.git
Move ssh and local connection plugins from using raw select to selectors
At the moment, this change will use EPoll on Linux, KQueue on *BSDs, etc, so it should alleviate problems with too many open file descriptors. * Bundle a copy of selectors2 so that we have the selectors API everywhere. * Add licensing information to selectors2 file so it's clear what the licensing terms and conditions are. * Exclude the bundled copy of selectors2 from our boilerplate code-smell test * Rewrite ssh_run tests to attempt to work around problem with mocking select on shippable Fixes #14143pull/21014/head
Toshio Kuratomi
7 years ago
parent
2c70450e23
commit
d1a6b07fe1
@ -0,0 +1,47 @@
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# (c) 2014, 2017 Toshio Kuratomi <tkuratomi@ansible.com>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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# Make coding more python3-ish
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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'''
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Compat selectors library. Python-3.5 has this builtin. The selectors2
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package exists on pypi to backport the functionality as far as python-2.6.
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'''
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# The following makes it easier for us to script updates of the bundled code
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_BUNDLED_METADATA = { "pypi_name": "selectors2", "version": "1.1.0" }
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import os.path
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import sys
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try:
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# Python 3.4+
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import selectors as _system_selectors
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except ImportError:
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try:
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# backport package installed in the system
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import selectors2 as _system_selectors
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except ImportError:
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_system_selectors = None
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if _system_selectors:
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selectors = _system_selectors
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else:
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# Our bundled copy
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from . import _selectors2 as selectors
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sys.modules['ansible.compat.selectors'] = selectors
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@ -0,0 +1,667 @@
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# This file is from the selectors2.py package. It backports the PSF Licensed
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# selectors module from the Python-3.5 stdlib to older versions of Python.
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# The author, Seth Michael Larson, dual licenses his modifications under the
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# PSF License and MIT License:
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# https://github.com/SethMichaelLarson/selectors2#license
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#
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# Seth's copy of the MIT license is reproduced below
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#
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# MIT License
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#
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# Copyright (c) 2016 Seth Michael Larson
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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# Backport of selectors.py from Python 3.5+ to support Python < 3.4
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# Also has the behavior specified in PEP 475 which is to retry syscalls
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# in the case of an EINTR error. This module is required because selectors34
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# does not follow this behavior and instead returns that no dile descriptor
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# events have occurred rather than retry the syscall. The decision to drop
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# support for select.devpoll is made to maintain 100% test coverage.
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import errno
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import math
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import select
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import socket
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import sys
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import time
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from collections import namedtuple, Mapping
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try:
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monotonic = time.monotonic
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except (AttributeError, ImportError): # Python 3.3<
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monotonic = time.time
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__author__ = 'Seth Michael Larson'
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__email__ = 'sethmichaellarson@protonmail.com'
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__version__ = '1.1.0'
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__license__ = 'MIT'
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__all__ = [
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'EVENT_READ',
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'EVENT_WRITE',
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'SelectorError',
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'SelectorKey',
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'DefaultSelector'
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]
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EVENT_READ = (1 << 0)
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EVENT_WRITE = (1 << 1)
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HAS_SELECT = True # Variable that shows whether the platform has a selector.
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_SYSCALL_SENTINEL = object() # Sentinel in case a system call returns None.
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class SelectorError(Exception):
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def __init__(self, errcode):
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super(SelectorError, self).__init__()
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self.errno = errcode
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def __repr__(self):
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return "<SelectorError errno={0}>".format(self.errno)
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def __str__(self):
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return self.__repr__()
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def _fileobj_to_fd(fileobj):
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""" Return a file descriptor from a file object. If
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given an integer will simply return that integer back. """
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if isinstance(fileobj, int):
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fd = fileobj
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else:
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try:
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fd = int(fileobj.fileno())
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except (AttributeError, TypeError, ValueError):
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raise ValueError("Invalid file object: {0!r}".format(fileobj))
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if fd < 0:
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raise ValueError("Invalid file descriptor: {0}".format(fd))
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return fd
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# Python 3.5 uses a more direct route to wrap system calls to increase speed.
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if sys.version_info >= (3, 5):
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def _syscall_wrapper(func, _, *args, **kwargs):
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""" This is the short-circuit version of the below logic
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because in Python 3.5+ all selectors restart system calls. """
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try:
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return func(*args, **kwargs)
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except (OSError, IOError, select.error) as e:
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errcode = None
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if hasattr(e, "errno"):
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errcode = e.errno
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elif hasattr(e, "args"):
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errcode = e.args[0]
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raise SelectorError(errcode)
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else:
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def _syscall_wrapper(func, recalc_timeout, *args, **kwargs):
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""" Wrapper function for syscalls that could fail due to EINTR.
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All functions should be retried if there is time left in the timeout
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in accordance with PEP 475. """
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timeout = kwargs.get("timeout", None)
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if timeout is None:
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expires = None
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recalc_timeout = False
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else:
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timeout = float(timeout)
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if timeout < 0.0: # Timeout less than 0 treated as no timeout.
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expires = None
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else:
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expires = monotonic() + timeout
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args = list(args)
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if recalc_timeout and "timeout" not in kwargs:
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raise ValueError(
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"Timeout must be in args or kwargs to be recalculated")
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result = _SYSCALL_SENTINEL
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while result is _SYSCALL_SENTINEL:
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try:
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result = func(*args, **kwargs)
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# OSError is thrown by select.select
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# IOError is thrown by select.epoll.poll
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# select.error is thrown by select.poll.poll
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# Aren't we thankful for Python 3.x rework for exceptions?
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except (OSError, IOError, select.error) as e:
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# select.error wasn't a subclass of OSError in the past.
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errcode = None
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if hasattr(e, "errno"):
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errcode = e.errno
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elif hasattr(e, "args"):
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errcode = e.args[0]
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# Also test for the Windows equivalent of EINTR.
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is_interrupt = (errcode == errno.EINTR or (hasattr(errno, "WSAEINTR") and
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errcode == errno.WSAEINTR))
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if is_interrupt:
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if expires is not None:
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current_time = monotonic()
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if current_time > expires:
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raise OSError(errno=errno.ETIMEDOUT)
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if recalc_timeout:
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if "timeout" in kwargs:
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kwargs["timeout"] = expires - current_time
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continue
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if errcode:
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raise SelectorError(errcode)
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else:
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raise
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return result
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SelectorKey = namedtuple('SelectorKey', ['fileobj', 'fd', 'events', 'data'])
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class _SelectorMapping(Mapping):
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""" Mapping of file objects to selector keys """
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def __init__(self, selector):
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self._selector = selector
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def __len__(self):
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return len(self._selector._fd_to_key)
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def __getitem__(self, fileobj):
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try:
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fd = self._selector._fileobj_lookup(fileobj)
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return self._selector._fd_to_key[fd]
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except KeyError:
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raise KeyError("{0!r} is not registered.".format(fileobj))
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def __iter__(self):
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return iter(self._selector._fd_to_key)
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class BaseSelector(object):
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""" Abstract Selector class
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A selector supports registering file objects to be monitored
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for specific I/O events.
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A file object is a file descriptor or any object with a
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`fileno()` method. An arbitrary object can be attached to the
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file object which can be used for example to store context info,
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a callback, etc.
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A selector can use various implementations (select(), poll(), epoll(),
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and kqueue()) depending on the platform. The 'DefaultSelector' class uses
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the most efficient implementation for the current platform.
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"""
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def __init__(self):
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# Maps file descriptors to keys.
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self._fd_to_key = {}
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# Read-only mapping returned by get_map()
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self._map = _SelectorMapping(self)
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def _fileobj_lookup(self, fileobj):
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""" Return a file descriptor from a file object.
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This wraps _fileobj_to_fd() to do an exhaustive
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search in case the object is invalid but we still
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have it in our map. Used by unregister() so we can
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unregister an object that was previously registered
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even if it is closed. It is also used by _SelectorMapping
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"""
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try:
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return _fileobj_to_fd(fileobj)
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except ValueError:
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# Search through all our mapped keys.
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for key in self._fd_to_key.values():
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if key.fileobj is fileobj:
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return key.fd
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# Raise ValueError after all.
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raise
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def register(self, fileobj, events, data=None):
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""" Register a file object for a set of events to monitor. """
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if (not events) or (events & ~(EVENT_READ | EVENT_WRITE)):
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raise ValueError("Invalid events: {0!r}".format(events))
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key = SelectorKey(fileobj, self._fileobj_lookup(fileobj), events, data)
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if key.fd in self._fd_to_key:
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raise KeyError("{0!r} (FD {1}) is already registered"
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.format(fileobj, key.fd))
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self._fd_to_key[key.fd] = key
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return key
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def unregister(self, fileobj):
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""" Unregister a file object from being monitored. """
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try:
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key = self._fd_to_key.pop(self._fileobj_lookup(fileobj))
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except KeyError:
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raise KeyError("{0!r} is not registered".format(fileobj))
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# Getting the fileno of a closed socket on Windows errors with EBADF.
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except socket.error as err:
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if err.errno != errno.EBADF:
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raise
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else:
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for key in self._fd_to_key.values():
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if key.fileobj is fileobj:
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self._fd_to_key.pop(key.fd)
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break
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else:
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raise KeyError("{0!r} is not registered".format(fileobj))
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return key
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def modify(self, fileobj, events, data=None):
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""" Change a registered file object monitored events and data. """
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# NOTE: Some subclasses optimize this operation even further.
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try:
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key = self._fd_to_key[self._fileobj_lookup(fileobj)]
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except KeyError:
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raise KeyError("{0!r} is not registered".format(fileobj))
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if events != key.events:
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self.unregister(fileobj)
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key = self.register(fileobj, events, data)
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elif data != key.data:
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# Use a shortcut to update the data.
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key = key._replace(data=data)
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self._fd_to_key[key.fd] = key
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return key
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def select(self, timeout=None):
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""" Perform the actual selection until some monitored file objects
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are ready or the timeout expires. """
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raise NotImplementedError()
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def close(self):
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""" Close the selector. This must be called to ensure that all
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underlying resources are freed. """
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self._fd_to_key.clear()
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self._map = None
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def get_key(self, fileobj):
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""" Return the key associated with a registered file object. """
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mapping = self.get_map()
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if mapping is None:
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raise RuntimeError("Selector is closed")
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try:
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return mapping[fileobj]
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except KeyError:
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raise KeyError("{0!r} is not registered".format(fileobj))
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def get_map(self):
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""" Return a mapping of file objects to selector keys """
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return self._map
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def _key_from_fd(self, fd):
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""" Return the key associated to a given file descriptor
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Return None if it is not found. """
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try:
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return self._fd_to_key[fd]
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except KeyError:
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return None
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||||
def __enter__(self):
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return self
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def __exit__(self, *args):
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self.close()
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# Almost all platforms have select.select()
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if hasattr(select, "select"):
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class SelectSelector(BaseSelector):
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""" Select-based selector. """
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def __init__(self):
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super(SelectSelector, self).__init__()
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self._readers = set()
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self._writers = set()
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def register(self, fileobj, events, data=None):
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key = super(SelectSelector, self).register(fileobj, events, data)
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if events & EVENT_READ:
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self._readers.add(key.fd)
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if events & EVENT_WRITE:
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self._writers.add(key.fd)
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return key
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||||
|
||||
def unregister(self, fileobj):
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||||
key = super(SelectSelector, self).unregister(fileobj)
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self._readers.discard(key.fd)
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self._writers.discard(key.fd)
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return key
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||||
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||||
def _select(self, r, w, timeout=None):
|
||||
""" Wrapper for select.select because timeout is a positional arg """
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||||
return select.select(r, w, [], timeout)
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||||
|
||||
def select(self, timeout=None):
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# Selecting on empty lists on Windows errors out.
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||||
if not len(self._readers) and not len(self._writers):
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||||
return []
|
||||
|
||||
timeout = None if timeout is None else max(timeout, 0.0)
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||||
ready = []
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||||
r, w, _ = _syscall_wrapper(self._select, True, self._readers,
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self._writers, timeout)
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||||
r = set(r)
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||||
w = set(w)
|
||||
for fd in r | w:
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||||
events = 0
|
||||
if fd in r:
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||||
events |= EVENT_READ
|
||||
if fd in w:
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||||
events |= EVENT_WRITE
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||||
|
||||
key = self._key_from_fd(fd)
|
||||
if key:
|
||||
ready.append((key, events & key.events))
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||||
return ready
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||||
|
||||
__all__.append('SelectSelector')
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||||
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||||
|
||||
if hasattr(select, "poll"):
|
||||
class PollSelector(BaseSelector):
|
||||
""" Poll-based selector """
|
||||
def __init__(self):
|
||||
super(PollSelector, self).__init__()
|
||||
self._poll = select.poll()
|
||||
|
||||
def register(self, fileobj, events, data=None):
|
||||
key = super(PollSelector, self).register(fileobj, events, data)
|
||||
event_mask = 0
|
||||
if events & EVENT_READ:
|
||||
event_mask |= select.POLLIN
|
||||
if events & EVENT_WRITE:
|
||||
event_mask |= select.POLLOUT
|
||||
self._poll.register(key.fd, event_mask)
|
||||
return key
|
||||
|
||||
def unregister(self, fileobj):
|
||||
key = super(PollSelector, self).unregister(fileobj)
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||||
self._poll.unregister(key.fd)
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||||
return key
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||||
|
||||
def _wrap_poll(self, timeout=None):
|
||||
""" Wrapper function for select.poll.poll() so that
|
||||
_syscall_wrapper can work with only seconds. """
|
||||
if timeout is not None:
|
||||
if timeout <= 0:
|
||||
timeout = 0
|
||||
else:
|
||||
# select.poll.poll() has a resolution of 1 millisecond,
|
||||
# round away from zero to wait *at least* timeout seconds.
|
||||
timeout = math.ceil(timeout * 1e3)
|
||||
|
||||
result = self._poll.poll(timeout)
|
||||
return result
|
||||
|
||||
def select(self, timeout=None):
|
||||
ready = []
|
||||
fd_events = _syscall_wrapper(self._wrap_poll, True, timeout=timeout)
|
||||
for fd, event_mask in fd_events:
|
||||
events = 0
|
||||
if event_mask & ~select.POLLIN:
|
||||
events |= EVENT_WRITE
|
||||
if event_mask & ~select.POLLOUT:
|
||||
events |= EVENT_READ
|
||||
|
||||
key = self._key_from_fd(fd)
|
||||
if key:
|
||||
ready.append((key, events & key.events))
|
||||
|
||||
return ready
|
||||
|
||||
__all__.append('PollSelector')
|
||||
|
||||
if hasattr(select, "epoll"):
|
||||
class EpollSelector(BaseSelector):
|
||||
""" Epoll-based selector """
|
||||
def __init__(self):
|
||||
super(EpollSelector, self).__init__()
|
||||
self._epoll = select.epoll()
|
||||
|
||||
def fileno(self):
|
||||
return self._epoll.fileno()
|
||||
|
||||
def register(self, fileobj, events, data=None):
|
||||
key = super(EpollSelector, self).register(fileobj, events, data)
|
||||
events_mask = 0
|
||||
if events & EVENT_READ:
|
||||
events_mask |= select.EPOLLIN
|
||||
if events & EVENT_WRITE:
|
||||
events_mask |= select.EPOLLOUT
|
||||
_syscall_wrapper(self._epoll.register, False, key.fd, events_mask)
|
||||
return key
|
||||
|
||||
def unregister(self, fileobj):
|
||||
key = super(EpollSelector, self).unregister(fileobj)
|
||||
try:
|
||||
_syscall_wrapper(self._epoll.unregister, False, key.fd)
|
||||
except SelectorError:
|
||||
# This can occur when the fd was closed since registry.
|
||||
pass
|
||||
return key
|
||||
|
||||
def select(self, timeout=None):
|
||||
if timeout is not None:
|
||||
if timeout <= 0:
|
||||
timeout = 0.0
|
||||
else:
|
||||
# select.epoll.poll() has a resolution of 1 millisecond
|
||||
# but luckily takes seconds so we don't need a wrapper
|
||||
# like PollSelector. Just for better rounding.
|
||||
timeout = math.ceil(timeout * 1e3) * 1e-3
|
||||
timeout = float(timeout)
|
||||
else:
|
||||
timeout = -1.0 # epoll.poll() must have a float.
|
||||
|
||||
# We always want at least 1 to ensure that select can be called
|
||||
# with no file descriptors registered. Otherwise will fail.
|
||||
max_events = max(len(self._fd_to_key), 1)
|
||||
|
||||
ready = []
|
||||
fd_events = _syscall_wrapper(self._epoll.poll, True,
|
||||
timeout=timeout,
|
||||
maxevents=max_events)
|
||||
for fd, event_mask in fd_events:
|
||||
events = 0
|
||||
if event_mask & ~select.EPOLLIN:
|
||||
events |= EVENT_WRITE
|
||||
if event_mask & ~select.EPOLLOUT:
|
||||
events |= EVENT_READ
|
||||
|
||||
key = self._key_from_fd(fd)
|
||||
if key:
|
||||
ready.append((key, events & key.events))
|
||||
return ready
|
||||
|
||||
def close(self):
|
||||
self._epoll.close()
|
||||
super(EpollSelector, self).close()
|
||||
|
||||
__all__.append('EpollSelector')
|
||||
|
||||
|
||||
if hasattr(select, "devpoll"):
|
||||
class DevpollSelector(BaseSelector):
|
||||
"""Solaris /dev/poll selector."""
|
||||
|
||||
def __init__(self):
|
||||
super(DevpollSelector, self).__init__()
|
||||
self._devpoll = select.devpoll()
|
||||
|
||||
def fileno(self):
|
||||
return self._devpoll.fileno()
|
||||
|
||||
def register(self, fileobj, events, data=None):
|
||||
key = super(DevpollSelector, self).register(fileobj, events, data)
|
||||
poll_events = 0
|
||||
if events & EVENT_READ:
|
||||
poll_events |= select.POLLIN
|
||||
if events & EVENT_WRITE:
|
||||
poll_events |= select.POLLOUT
|
||||
self._devpoll.register(key.fd, poll_events)
|
||||
return key
|
||||
|
||||
def unregister(self, fileobj):
|
||||
key = super(DevpollSelector, self).unregister(fileobj)
|
||||
self._devpoll.unregister(key.fd)
|
||||
return key
|
||||
|
||||
def _wrap_poll(self, timeout=None):
|
||||
""" Wrapper function for select.poll.poll() so that
|
||||
_syscall_wrapper can work with only seconds. """
|
||||
if timeout is not None:
|
||||
if timeout <= 0:
|
||||
timeout = 0
|
||||
else:
|
||||
# select.devpoll.poll() has a resolution of 1 millisecond,
|
||||
# round away from zero to wait *at least* timeout seconds.
|
||||
timeout = math.ceil(timeout * 1e3)
|
||||
|
||||
result = self._devpoll.poll(timeout)
|
||||
return result
|
||||
|
||||
def select(self, timeout=None):
|
||||
ready = []
|
||||
fd_events = _syscall_wrapper(self._wrap_poll, True, timeout=timeout)
|
||||
for fd, event_mask in fd_events:
|
||||
events = 0
|
||||
if event_mask & ~select.POLLIN:
|
||||
events |= EVENT_WRITE
|
||||
if event_mask & ~select.POLLOUT:
|
||||
events |= EVENT_READ
|
||||
|
||||
key = self._key_from_fd(fd)
|
||||
if key:
|
||||
ready.append((key, events & key.events))
|
||||
|
||||
return ready
|
||||
|
||||
def close(self):
|
||||
self._devpoll.close()
|
||||
super(DevpollSelector, self).close()
|
||||
|
||||
__all__.append('DevpollSelector')
|
||||
|
||||
|
||||
if hasattr(select, "kqueue"):
|
||||
class KqueueSelector(BaseSelector):
|
||||
""" Kqueue / Kevent-based selector """
|
||||
def __init__(self):
|
||||
super(KqueueSelector, self).__init__()
|
||||
self._kqueue = select.kqueue()
|
||||
|
||||
def fileno(self):
|
||||
return self._kqueue.fileno()
|
||||
|
||||
def register(self, fileobj, events, data=None):
|
||||
key = super(KqueueSelector, self).register(fileobj, events, data)
|
||||
if events & EVENT_READ:
|
||||
kevent = select.kevent(key.fd,
|
||||
select.KQ_FILTER_READ,
|
||||
select.KQ_EV_ADD)
|
||||
|
||||
_syscall_wrapper(self._kqueue.control, False, [kevent], 0, 0)
|
||||
|
||||
if events & EVENT_WRITE:
|
||||
kevent = select.kevent(key.fd,
|
||||
select.KQ_FILTER_WRITE,
|
||||
select.KQ_EV_ADD)
|
||||
|
||||
_syscall_wrapper(self._kqueue.control, False, [kevent], 0, 0)
|
||||
|
||||
return key
|
||||
|
||||
def unregister(self, fileobj):
|
||||
key = super(KqueueSelector, self).unregister(fileobj)
|
||||
if key.events & EVENT_READ:
|
||||
kevent = select.kevent(key.fd,
|
||||
select.KQ_FILTER_READ,
|
||||
select.KQ_EV_DELETE)
|
||||
try:
|
||||
_syscall_wrapper(self._kqueue.control, False, [kevent], 0, 0)
|
||||
except SelectorError:
|
||||
pass
|
||||
if key.events & EVENT_WRITE:
|
||||
kevent = select.kevent(key.fd,
|
||||
select.KQ_FILTER_WRITE,
|
||||
select.KQ_EV_DELETE)
|
||||
try:
|
||||
_syscall_wrapper(self._kqueue.control, False, [kevent], 0, 0)
|
||||
except SelectorError:
|
||||
pass
|
||||
|
||||
return key
|
||||
|
||||
def select(self, timeout=None):
|
||||
if timeout is not None:
|
||||
timeout = max(timeout, 0)
|
||||
|
||||
max_events = len(self._fd_to_key) * 2
|
||||
ready_fds = {}
|
||||
|
||||
kevent_list = _syscall_wrapper(self._kqueue.control, True,
|
||||
None, max_events, timeout)
|
||||
|
||||
for kevent in kevent_list:
|
||||
fd = kevent.ident
|
||||
event_mask = kevent.filter
|
||||
events = 0
|
||||
if event_mask == select.KQ_FILTER_READ:
|
||||
events |= EVENT_READ
|
||||
if event_mask == select.KQ_FILTER_WRITE:
|
||||
events |= EVENT_WRITE
|
||||
|
||||
key = self._key_from_fd(fd)
|
||||
if key:
|
||||
if key.fd not in ready_fds:
|
||||
ready_fds[key.fd] = (key, events & key.events)
|
||||
else:
|
||||
old_events = ready_fds[key.fd][1]
|
||||
ready_fds[key.fd] = (key, (events | old_events) & key.events)
|
||||
|
||||
return list(ready_fds.values())
|
||||
|
||||
def close(self):
|
||||
self._kqueue.close()
|
||||
super(KqueueSelector, self).close()
|
||||
|
||||
__all__.append('KqueueSelector')
|
||||
|
||||
|
||||
# Choose the best implementation, roughly:
|
||||
# kqueue == epoll == devpoll > poll > select.
|
||||
# select() also can't accept a FD > FD_SETSIZE (usually around 1024)
|
||||
if 'KqueueSelector' in globals(): # Platform-specific: Mac OS and BSD
|
||||
DefaultSelector = KqueueSelector
|
||||
if 'DevpollSelector' in globals():
|
||||
DefaultSelector = DevpollSelector
|
||||
elif 'EpollSelector' in globals(): # Platform-specific: Linux
|
||||
DefaultSelector = EpollSelector
|
||||
elif 'PollSelector' in globals(): # Platform-specific: Linux
|
||||
DefaultSelector = PollSelector
|
||||
elif 'SelectSelector' in globals(): # Platform-specific: Windows
|
||||
DefaultSelector = SelectSelector
|
||||
else: # Platform-specific: AppEngine
|
||||
def no_selector(_):
|
||||
raise ValueError("Platform does not have a selector")
|
||||
DefaultSelector = no_selector
|
||||
HAS_SELECT = False
|
||||
Loading…
Reference in New Issue