mirror of https://github.com/ansible/ansible.git
Remove Python `< 3.5` `selectors` fallbacks (#81872)
parent
46623b0a96
commit
d2ba76c117
@ -1,656 +0,0 @@
|
|||||||
# This file is from the selectors2.py package. It backports the PSF Licensed
|
|
||||||
# selectors module from the Python-3.5 stdlib to older versions of Python.
|
|
||||||
# The author, Seth Michael Larson, dual licenses his modifications under the
|
|
||||||
# PSF License and MIT License:
|
|
||||||
# https://github.com/SethMichaelLarson/selectors2#license
|
|
||||||
#
|
|
||||||
# Copyright (c) 2016 Seth Michael Larson
|
|
||||||
#
|
|
||||||
# PSF License (see licenses/PSF-license.txt or https://opensource.org/licenses/Python-2.0)
|
|
||||||
# MIT License (see licenses/MIT-license.txt or https://opensource.org/licenses/MIT)
|
|
||||||
#
|
|
||||||
|
|
||||||
|
|
||||||
# Backport of selectors.py from Python 3.5+ to support Python < 3.4
|
|
||||||
# Also has the behavior specified in PEP 475 which is to retry syscalls
|
|
||||||
# in the case of an EINTR error. This module is required because selectors34
|
|
||||||
# does not follow this behavior and instead returns that no file descriptor
|
|
||||||
# events have occurred rather than retry the syscall. The decision to drop
|
|
||||||
# support for select.devpoll is made to maintain 100% test coverage.
|
|
||||||
from __future__ import annotations
|
|
||||||
|
|
||||||
import errno
|
|
||||||
import math
|
|
||||||
import select
|
|
||||||
import socket
|
|
||||||
import sys
|
|
||||||
import time
|
|
||||||
from collections import namedtuple
|
|
||||||
from ansible.module_utils.six.moves.collections_abc import Mapping
|
|
||||||
|
|
||||||
try:
|
|
||||||
monotonic = time.monotonic
|
|
||||||
except (AttributeError, ImportError): # Python 3.3<
|
|
||||||
monotonic = time.time
|
|
||||||
|
|
||||||
__author__ = 'Seth Michael Larson'
|
|
||||||
__email__ = 'sethmichaellarson@protonmail.com'
|
|
||||||
__version__ = '1.1.1'
|
|
||||||
__license__ = 'MIT'
|
|
||||||
|
|
||||||
__all__ = [
|
|
||||||
'EVENT_READ',
|
|
||||||
'EVENT_WRITE',
|
|
||||||
'SelectorError',
|
|
||||||
'SelectorKey',
|
|
||||||
'DefaultSelector'
|
|
||||||
]
|
|
||||||
|
|
||||||
EVENT_READ = (1 << 0)
|
|
||||||
EVENT_WRITE = (1 << 1)
|
|
||||||
|
|
||||||
HAS_SELECT = True # Variable that shows whether the platform has a selector.
|
|
||||||
_SYSCALL_SENTINEL = object() # Sentinel in case a system call returns None.
|
|
||||||
|
|
||||||
|
|
||||||
class SelectorError(Exception):
|
|
||||||
def __init__(self, errcode):
|
|
||||||
super(SelectorError, self).__init__()
|
|
||||||
self.errno = errcode
|
|
||||||
|
|
||||||
def __repr__(self):
|
|
||||||
return "<SelectorError errno={0}>".format(self.errno)
|
|
||||||
|
|
||||||
def __str__(self):
|
|
||||||
return self.__repr__()
|
|
||||||
|
|
||||||
|
|
||||||
def _fileobj_to_fd(fileobj):
|
|
||||||
""" Return a file descriptor from a file object. If
|
|
||||||
given an integer will simply return that integer back. """
|
|
||||||
if isinstance(fileobj, int):
|
|
||||||
fd = fileobj
|
|
||||||
else:
|
|
||||||
try:
|
|
||||||
fd = int(fileobj.fileno())
|
|
||||||
except (AttributeError, TypeError, ValueError):
|
|
||||||
raise ValueError("Invalid file object: {0!r}".format(fileobj))
|
|
||||||
if fd < 0:
|
|
||||||
raise ValueError("Invalid file descriptor: {0}".format(fd))
|
|
||||||
return fd
|
|
||||||
|
|
||||||
|
|
||||||
# Python 3.5 uses a more direct route to wrap system calls to increase speed.
|
|
||||||
if sys.version_info >= (3, 5):
|
|
||||||
def _syscall_wrapper(func, dummy, *args, **kwargs):
|
|
||||||
""" This is the short-circuit version of the below logic
|
|
||||||
because in Python 3.5+ all selectors restart system calls. """
|
|
||||||
try:
|
|
||||||
return func(*args, **kwargs)
|
|
||||||
except (OSError, IOError, select.error) as e:
|
|
||||||
errcode = None
|
|
||||||
if hasattr(e, "errno"):
|
|
||||||
errcode = e.errno
|
|
||||||
elif hasattr(e, "args"):
|
|
||||||
errcode = e.args[0]
|
|
||||||
raise SelectorError(errcode)
|
|
||||||
else:
|
|
||||||
def _syscall_wrapper(func, recalc_timeout, *args, **kwargs):
|
|
||||||
""" Wrapper function for syscalls that could fail due to EINTR.
|
|
||||||
All functions should be retried if there is time left in the timeout
|
|
||||||
in accordance with PEP 475. """
|
|
||||||
timeout = kwargs.get("timeout", None)
|
|
||||||
if timeout is None:
|
|
||||||
expires = None
|
|
||||||
recalc_timeout = False
|
|
||||||
else:
|
|
||||||
timeout = float(timeout)
|
|
||||||
if timeout < 0.0: # Timeout less than 0 treated as no timeout.
|
|
||||||
expires = None
|
|
||||||
else:
|
|
||||||
expires = monotonic() + timeout
|
|
||||||
|
|
||||||
args = list(args)
|
|
||||||
if recalc_timeout and "timeout" not in kwargs:
|
|
||||||
raise ValueError(
|
|
||||||
"Timeout must be in args or kwargs to be recalculated")
|
|
||||||
|
|
||||||
result = _SYSCALL_SENTINEL
|
|
||||||
while result is _SYSCALL_SENTINEL:
|
|
||||||
try:
|
|
||||||
result = func(*args, **kwargs)
|
|
||||||
# OSError is thrown by select.select
|
|
||||||
# IOError is thrown by select.epoll.poll
|
|
||||||
# select.error is thrown by select.poll.poll
|
|
||||||
# Aren't we thankful for Python 3.x rework for exceptions?
|
|
||||||
except (OSError, IOError, select.error) as e:
|
|
||||||
# select.error wasn't a subclass of OSError in the past.
|
|
||||||
errcode = None
|
|
||||||
if hasattr(e, "errno"):
|
|
||||||
errcode = e.errno
|
|
||||||
elif hasattr(e, "args"):
|
|
||||||
errcode = e.args[0]
|
|
||||||
|
|
||||||
# Also test for the Windows equivalent of EINTR.
|
|
||||||
is_interrupt = (errcode == errno.EINTR or (hasattr(errno, "WSAEINTR") and
|
|
||||||
errcode == errno.WSAEINTR))
|
|
||||||
|
|
||||||
if is_interrupt:
|
|
||||||
if expires is not None:
|
|
||||||
current_time = monotonic()
|
|
||||||
if current_time > expires:
|
|
||||||
raise OSError(errno.ETIMEDOUT)
|
|
||||||
if recalc_timeout:
|
|
||||||
if "timeout" in kwargs:
|
|
||||||
kwargs["timeout"] = expires - current_time
|
|
||||||
continue
|
|
||||||
if errcode:
|
|
||||||
raise SelectorError(errcode)
|
|
||||||
else:
|
|
||||||
raise
|
|
||||||
return result
|
|
||||||
|
|
||||||
|
|
||||||
SelectorKey = namedtuple('SelectorKey', ['fileobj', 'fd', 'events', 'data'])
|
|
||||||
|
|
||||||
|
|
||||||
class _SelectorMapping(Mapping):
|
|
||||||
""" Mapping of file objects to selector keys """
|
|
||||||
|
|
||||||
def __init__(self, selector):
|
|
||||||
self._selector = selector
|
|
||||||
|
|
||||||
def __len__(self):
|
|
||||||
return len(self._selector._fd_to_key)
|
|
||||||
|
|
||||||
def __getitem__(self, fileobj):
|
|
||||||
try:
|
|
||||||
fd = self._selector._fileobj_lookup(fileobj)
|
|
||||||
return self._selector._fd_to_key[fd]
|
|
||||||
except KeyError:
|
|
||||||
raise KeyError("{0!r} is not registered.".format(fileobj))
|
|
||||||
|
|
||||||
def __iter__(self):
|
|
||||||
return iter(self._selector._fd_to_key)
|
|
||||||
|
|
||||||
|
|
||||||
class BaseSelector(object):
|
|
||||||
""" Abstract Selector class
|
|
||||||
|
|
||||||
A selector supports registering file objects to be monitored
|
|
||||||
for specific I/O events.
|
|
||||||
|
|
||||||
A file object is a file descriptor or any object with a
|
|
||||||
`fileno()` method. An arbitrary object can be attached to the
|
|
||||||
file object which can be used for example to store context info,
|
|
||||||
a callback, etc.
|
|
||||||
|
|
||||||
A selector can use various implementations (select(), poll(), epoll(),
|
|
||||||
and kqueue()) depending on the platform. The 'DefaultSelector' class uses
|
|
||||||
the most efficient implementation for the current platform.
|
|
||||||
"""
|
|
||||||
def __init__(self):
|
|
||||||
# Maps file descriptors to keys.
|
|
||||||
self._fd_to_key = {}
|
|
||||||
|
|
||||||
# Read-only mapping returned by get_map()
|
|
||||||
self._map = _SelectorMapping(self)
|
|
||||||
|
|
||||||
def _fileobj_lookup(self, fileobj):
|
|
||||||
""" Return a file descriptor from a file object.
|
|
||||||
This wraps _fileobj_to_fd() to do an exhaustive
|
|
||||||
search in case the object is invalid but we still
|
|
||||||
have it in our map. Used by unregister() so we can
|
|
||||||
unregister an object that was previously registered
|
|
||||||
even if it is closed. It is also used by _SelectorMapping
|
|
||||||
"""
|
|
||||||
try:
|
|
||||||
return _fileobj_to_fd(fileobj)
|
|
||||||
except ValueError:
|
|
||||||
|
|
||||||
# Search through all our mapped keys.
|
|
||||||
for key in self._fd_to_key.values():
|
|
||||||
if key.fileobj is fileobj:
|
|
||||||
return key.fd
|
|
||||||
|
|
||||||
# Raise ValueError after all.
|
|
||||||
raise
|
|
||||||
|
|
||||||
def register(self, fileobj, events, data=None):
|
|
||||||
""" Register a file object for a set of events to monitor. """
|
|
||||||
if (not events) or (events & ~(EVENT_READ | EVENT_WRITE)):
|
|
||||||
raise ValueError("Invalid events: {0!r}".format(events))
|
|
||||||
|
|
||||||
key = SelectorKey(fileobj, self._fileobj_lookup(fileobj), events, data)
|
|
||||||
|
|
||||||
if key.fd in self._fd_to_key:
|
|
||||||
raise KeyError("{0!r} (FD {1}) is already registered"
|
|
||||||
.format(fileobj, key.fd))
|
|
||||||
|
|
||||||
self._fd_to_key[key.fd] = key
|
|
||||||
return key
|
|
||||||
|
|
||||||
def unregister(self, fileobj):
|
|
||||||
""" Unregister a file object from being monitored. """
|
|
||||||
try:
|
|
||||||
key = self._fd_to_key.pop(self._fileobj_lookup(fileobj))
|
|
||||||
except KeyError:
|
|
||||||
raise KeyError("{0!r} is not registered".format(fileobj))
|
|
||||||
|
|
||||||
# Getting the fileno of a closed socket on Windows errors with EBADF.
|
|
||||||
except socket.error as err:
|
|
||||||
if err.errno != errno.EBADF:
|
|
||||||
raise
|
|
||||||
else:
|
|
||||||
for key in self._fd_to_key.values():
|
|
||||||
if key.fileobj is fileobj:
|
|
||||||
self._fd_to_key.pop(key.fd)
|
|
||||||
break
|
|
||||||
else:
|
|
||||||
raise KeyError("{0!r} is not registered".format(fileobj))
|
|
||||||
return key
|
|
||||||
|
|
||||||
def modify(self, fileobj, events, data=None):
|
|
||||||
""" Change a registered file object monitored events and data. """
|
|
||||||
# NOTE: Some subclasses optimize this operation even further.
|
|
||||||
try:
|
|
||||||
key = self._fd_to_key[self._fileobj_lookup(fileobj)]
|
|
||||||
except KeyError:
|
|
||||||
raise KeyError("{0!r} is not registered".format(fileobj))
|
|
||||||
|
|
||||||
if events != key.events:
|
|
||||||
self.unregister(fileobj)
|
|
||||||
key = self.register(fileobj, events, data)
|
|
||||||
|
|
||||||
elif data != key.data:
|
|
||||||
# Use a shortcut to update the data.
|
|
||||||
key = key._replace(data=data)
|
|
||||||
self._fd_to_key[key.fd] = key
|
|
||||||
|
|
||||||
return key
|
|
||||||
|
|
||||||
def select(self, timeout=None):
|
|
||||||
""" Perform the actual selection until some monitored file objects
|
|
||||||
are ready or the timeout expires. """
|
|
||||||
raise NotImplementedError()
|
|
||||||
|
|
||||||
def close(self):
|
|
||||||
""" Close the selector. This must be called to ensure that all
|
|
||||||
underlying resources are freed. """
|
|
||||||
self._fd_to_key.clear()
|
|
||||||
self._map = None
|
|
||||||
|
|
||||||
def get_key(self, fileobj):
|
|
||||||
""" Return the key associated with a registered file object. """
|
|
||||||
mapping = self.get_map()
|
|
||||||
if mapping is None:
|
|
||||||
raise RuntimeError("Selector is closed")
|
|
||||||
try:
|
|
||||||
return mapping[fileobj]
|
|
||||||
except KeyError:
|
|
||||||
raise KeyError("{0!r} is not registered".format(fileobj))
|
|
||||||
|
|
||||||
def get_map(self):
|
|
||||||
""" Return a mapping of file objects to selector keys """
|
|
||||||
return self._map
|
|
||||||
|
|
||||||
def _key_from_fd(self, fd):
|
|
||||||
""" Return the key associated to a given file descriptor
|
|
||||||
Return None if it is not found. """
|
|
||||||
try:
|
|
||||||
return self._fd_to_key[fd]
|
|
||||||
except KeyError:
|
|
||||||
return None
|
|
||||||
|
|
||||||
def __enter__(self):
|
|
||||||
return self
|
|
||||||
|
|
||||||
def __exit__(self, *args):
|
|
||||||
self.close()
|
|
||||||
|
|
||||||
|
|
||||||
# Almost all platforms have select.select()
|
|
||||||
if hasattr(select, "select"):
|
|
||||||
class SelectSelector(BaseSelector):
|
|
||||||
""" Select-based selector. """
|
|
||||||
def __init__(self):
|
|
||||||
super(SelectSelector, self).__init__()
|
|
||||||
self._readers = set()
|
|
||||||
self._writers = set()
|
|
||||||
|
|
||||||
def register(self, fileobj, events, data=None):
|
|
||||||
key = super(SelectSelector, self).register(fileobj, events, data)
|
|
||||||
if events & EVENT_READ:
|
|
||||||
self._readers.add(key.fd)
|
|
||||||
if events & EVENT_WRITE:
|
|
||||||
self._writers.add(key.fd)
|
|
||||||
return key
|
|
||||||
|
|
||||||
def unregister(self, fileobj):
|
|
||||||
key = super(SelectSelector, self).unregister(fileobj)
|
|
||||||
self._readers.discard(key.fd)
|
|
||||||
self._writers.discard(key.fd)
|
|
||||||
return key
|
|
||||||
|
|
||||||
def _select(self, r, w, timeout=None):
|
|
||||||
""" Wrapper for select.select because timeout is a positional arg """
|
|
||||||
return select.select(r, w, [], timeout)
|
|
||||||
|
|
||||||
def select(self, timeout=None):
|
|
||||||
# Selecting on empty lists on Windows errors out.
|
|
||||||
if not len(self._readers) and not len(self._writers):
|
|
||||||
return []
|
|
||||||
|
|
||||||
timeout = None if timeout is None else max(timeout, 0.0)
|
|
||||||
ready = []
|
|
||||||
r, w, dummy = _syscall_wrapper(self._select, True, self._readers,
|
|
||||||
self._writers, timeout=timeout)
|
|
||||||
r = set(r)
|
|
||||||
w = set(w)
|
|
||||||
for fd in r | w:
|
|
||||||
events = 0
|
|
||||||
if fd in r:
|
|
||||||
events |= EVENT_READ
|
|
||||||
if fd in w:
|
|
||||||
events |= EVENT_WRITE
|
|
||||||
|
|
||||||
key = self._key_from_fd(fd)
|
|
||||||
if key:
|
|
||||||
ready.append((key, events & key.events))
|
|
||||||
return ready
|
|
||||||
|
|
||||||
__all__.append('SelectSelector')
|
|
||||||
|
|
||||||
|
|
||||||
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)
|
|
||||||
self._poll.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.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._wrap_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._wrap_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._wrap_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._wrap_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._wrap_control, True,
|
|
||||||
None, max_events, timeout=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()
|
|
||||||
|
|
||||||
def _wrap_control(self, changelist, max_events, timeout):
|
|
||||||
return self._kqueue.control(changelist, max_events, timeout)
|
|
||||||
|
|
||||||
__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
|
|
||||||
elif '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(dummy):
|
|
||||||
raise ValueError("Platform does not have a selector")
|
|
||||||
DefaultSelector = no_selector
|
|
||||||
HAS_SELECT = False
|
|
Loading…
Reference in New Issue