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"""
kombu.utils.eventio
===================
Evented IO support for multiple platforms.
"""
from __future__ import absolute_import
import errno
import socket
from select import select as _selectf
try:
from select import epoll
except ImportError:
epoll = None # noqa
try:
from select import (
kqueue,
kevent,
KQ_EV_ADD,
KQ_EV_DELETE,
KQ_EV_EOF,
KQ_EV_ERROR,
KQ_EV_ENABLE,
KQ_EV_CLEAR,
KQ_FILTER_WRITE,
KQ_FILTER_READ,
KQ_FILTER_VNODE,
KQ_NOTE_WRITE,
KQ_NOTE_EXTEND,
KQ_NOTE_DELETE,
KQ_NOTE_ATTRIB,
)
except ImportError:
kqueue = kevent = None # noqa
KQ_EV_ADD = KQ_EV_DELETE = KQ_EV_EOF = KQ_EV_ERROR = 0 # noqa
KQ_EV_ENABLE = KQ_EV_CLEAR = KQ_EV_VNODE = 0 # noqa
KQ_FILTER_WRITE = KQ_FILTER_READ = 0 # noqa
KQ_NOTE_WRITE = KQ_NOTE_EXTEND = 0 # noqa
KQ_NOTE_ATTRIB = KQ_NOTE_DELETE = 0 # noqa
from kombu.syn import detect_environment
__all__ = ['poll']
READ = POLL_READ = 0x001
WRITE = POLL_WRITE = 0x004
ERR = POLL_ERR = 0x008 | 0x010
def get_errno(exc):
try:
return exc.errno
except AttributeError:
try:
# e.args = (errno, reason)
if isinstance(exc.args, tuple) and len(exc.args) == 2:
return exc.args[0]
except AttributeError:
pass
return 0
class Poller(object):
def poll(self, timeout):
try:
return self._poll(timeout)
except Exception as exc:
if get_errno(exc) != errno.EINTR:
raise
class _epoll(Poller):
def __init__(self):
self._epoll = epoll()
def register(self, fd, events):
try:
self._epoll.register(fd, events)
except Exception as exc:
if get_errno(exc) != errno.EEXIST:
raise
def unregister(self, fd):
try:
self._epoll.unregister(fd)
except socket.error:
pass
except ValueError:
pass
except IOError as exc:
if get_errno(exc) != errno.ENOENT:
raise
def _poll(self, timeout):
return self._epoll.poll(timeout if timeout is not None else -1)
def close(self):
self._epoll.close()
class _kqueue(Poller):
w_fflags = (KQ_NOTE_WRITE | KQ_NOTE_EXTEND |
KQ_NOTE_ATTRIB | KQ_NOTE_DELETE)
def __init__(self):
self._kqueue = kqueue()
self._active = {}
self.on_file_change = None
self._kcontrol = self._kqueue.control
def register(self, fd, events):
self._control(fd, events, KQ_EV_ADD)
self._active[fd] = events
def unregister(self, fd):
events = self._active.pop(fd, None)
if events:
try:
self._control(fd, events, KQ_EV_DELETE)
except socket.error:
pass
def watch_file(self, fd):
ev = kevent(fd,
filter=KQ_FILTER_VNODE,
flags=KQ_EV_ADD | KQ_EV_ENABLE | KQ_EV_CLEAR,
fflags=self.w_fflags)
self._kcontrol([ev], 0)
def unwatch_file(self, fd):
ev = kevent(fd,
filter=KQ_FILTER_VNODE,
flags=KQ_EV_DELETE,
fflags=self.w_fflags)
self._kcontrol([ev], 0)
def _control(self, fd, events, flags):
if not events:
return
kevents = []
if events & WRITE:
kevents.append(kevent(fd,
filter=KQ_FILTER_WRITE,
flags=flags))
if not kevents or events & READ:
kevents.append(
kevent(fd, filter=KQ_FILTER_READ, flags=flags),
)
control = self._kcontrol
for e in kevents:
try:
control([e], 0)
except ValueError:
pass
def _poll(self, timeout):
kevents = self._kcontrol(None, 1000, timeout)
events, file_changes = {}, []
for k in kevents:
fd = k.ident
if k.filter == KQ_FILTER_READ:
events[fd] = events.get(fd, 0) | READ
elif k.filter == KQ_FILTER_WRITE:
if k.flags & KQ_EV_EOF:
events[fd] = ERR
else:
events[fd] = events.get(fd, 0) | WRITE
elif k.filter == KQ_EV_ERROR:
events[fd] = events.get(fd, 0) | ERR
elif k.filter == KQ_FILTER_VNODE:
if k.fflags & KQ_NOTE_DELETE:
self.unregister(fd)
file_changes.append(k)
if file_changes:
self.on_file_change(file_changes)
return list(events.items())
def close(self):
self._kqueue.close()
class _select(Poller):
def __init__(self):
self._all = (self._rfd,
self._wfd,
self._efd) = set(), set(), set()
def register(self, fd, events):
if events & ERR:
self._efd.add(fd)
self._rfd.add(fd)
if events & WRITE:
self._wfd.add(fd)
if events & READ:
self._rfd.add(fd)
def unregister(self, fd):
self._rfd.discard(fd)
self._wfd.discard(fd)
self._efd.discard(fd)
def _poll(self, timeout):
read, write, error = _selectf(self._rfd, self._wfd, self._efd, timeout)
events = {}
for fd in read:
if not isinstance(fd, int):
fd = fd.fileno()
events[fd] = events.get(fd, 0) | READ
for fd in write:
if not isinstance(fd, int):
fd = fd.fileno()
events[fd] = events.get(fd, 0) | WRITE
for fd in error:
if not isinstance(fd, int):
fd = fd.fileno()
events[fd] = events.get(fd, 0) | ERR
return list(events.items())
def close(self):
pass
def _get_poller():
if detect_environment() != 'default':
# greenlet
return _select
elif epoll:
# Py2.6+ Linux
return _epoll
elif kqueue:
# Py2.6+ on BSD / Darwin
return _kqueue
else:
return _select
def poll(*args, **kwargs):
return _get_poller()(*args, **kwargs)
|
