288 lines
7.8 KiB
Python
288 lines
7.8 KiB
Python
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# pylint: disable=too-many-lines, protected-access, redefined-outer-name, not-callable
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# pylint: disable=no-member
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from __future__ import absolute_import, print_function
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import sys
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from gevent.libev import _corecffi # pylint:disable=no-name-in-module,import-error
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# Nothing public here
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__all__ = []
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ffi = _corecffi.ffi # pylint:disable=no-member
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libev = _corecffi.lib # pylint:disable=no-member
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if hasattr(libev, 'vfd_open'):
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# Must be on windows
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# pylint:disable=c-extension-no-member
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assert sys.platform.startswith("win"), "vfd functions only needed on windows"
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vfd_open = libev.vfd_open
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vfd_free = libev.vfd_free
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vfd_get = libev.vfd_get
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else:
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vfd_open = vfd_free = vfd_get = lambda fd: fd
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#####
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## NOTE on Windows:
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# The C implementation does several things specially for Windows;
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# a possibly incomplete list is:
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#
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# - the loop runs a periodic signal checker;
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# - the io watcher constructor is different and it has a destructor;
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# - the child watcher is not defined
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#
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# The CFFI implementation does none of these things, and so
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# is possibly NOT FUNCTIONALLY CORRECT on Win32
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#####
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_NOARGS = ()
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_events = [(libev.EV_READ, 'READ'),
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(libev.EV_WRITE, 'WRITE'),
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(libev.EV__IOFDSET, '_IOFDSET'),
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(libev.EV_PERIODIC, 'PERIODIC'),
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(libev.EV_SIGNAL, 'SIGNAL'),
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(libev.EV_CHILD, 'CHILD'),
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(libev.EV_STAT, 'STAT'),
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(libev.EV_IDLE, 'IDLE'),
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(libev.EV_PREPARE, 'PREPARE'),
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(libev.EV_CHECK, 'CHECK'),
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(libev.EV_EMBED, 'EMBED'),
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(libev.EV_FORK, 'FORK'),
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(libev.EV_CLEANUP, 'CLEANUP'),
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(libev.EV_ASYNC, 'ASYNC'),
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(libev.EV_CUSTOM, 'CUSTOM'),
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(libev.EV_ERROR, 'ERROR')]
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from gevent._ffi import watcher as _base
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def _events_to_str(events):
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return _base.events_to_str(events, _events)
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class watcher(_base.watcher):
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_FFI = ffi
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_LIB = libev
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_watcher_prefix = 'ev'
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# Flags is a bitfield with the following meaning:
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# 0000 -> default, referenced (when active)
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# 0010 -> ev_unref has been called
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# 0100 -> not referenced; independent of 0010
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_flags = 0
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def __init__(self, _loop, ref=True, priority=None, args=_base._NOARGS):
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if ref:
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self._flags = 0
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else:
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self._flags = 4
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super(watcher, self).__init__(_loop, ref=ref, priority=priority, args=args)
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def _watcher_ffi_set_priority(self, priority):
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libev.ev_set_priority(self._watcher, priority)
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def _watcher_ffi_init(self, args):
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self._watcher_init(self._watcher,
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self._watcher_callback,
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*args)
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def _watcher_ffi_start(self):
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self._watcher_start(self.loop._ptr, self._watcher)
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def _watcher_ffi_ref(self):
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if self._flags & 2: # we've told libev we're not referenced
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self.loop.ref()
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self._flags &= ~2
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def _watcher_ffi_unref(self):
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if self._flags & 6 == 4:
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# We're not referenced, but we haven't told libev that
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self.loop.unref()
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self._flags |= 2 # now we've told libev
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def _get_ref(self):
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return not self._flags & 4
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def _set_ref(self, value):
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if value:
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if not self._flags & 4:
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return # ref is already True
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if self._flags & 2: # ev_unref was called, undo
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self.loop.ref()
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self._flags &= ~6 # do not want unref, no outstanding unref
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else:
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if self._flags & 4:
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return # ref is already False
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self._flags |= 4 # we're not referenced
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if not self._flags & 2 and libev.ev_is_active(self._watcher):
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# we haven't told libev we're not referenced, but it thinks we're
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# active so we need to undo that
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self.loop.unref()
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self._flags |= 2 # libev knows we're not referenced
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ref = property(_get_ref, _set_ref)
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def _get_priority(self):
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return libev.ev_priority(self._watcher)
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@_base.not_while_active
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def _set_priority(self, priority):
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libev.ev_set_priority(self._watcher, priority)
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priority = property(_get_priority, _set_priority)
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def feed(self, revents, callback, *args):
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self.callback = callback
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self.args = args or _NOARGS
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if self._flags & 6 == 4:
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self.loop.unref()
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self._flags |= 2
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libev.ev_feed_event(self.loop._ptr, self._watcher, revents)
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if not self._flags & 1:
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# Py_INCREF(<PyObjectPtr>self)
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self._flags |= 1
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@property
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def pending(self):
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return bool(self._watcher and libev.ev_is_pending(self._watcher))
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class io(_base.IoMixin, watcher):
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EVENT_MASK = libev.EV__IOFDSET | libev.EV_READ | libev.EV_WRITE
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def _get_fd(self):
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return vfd_get(self._watcher.fd)
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@_base.not_while_active
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def _set_fd(self, fd):
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vfd = vfd_open(fd)
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vfd_free(self._watcher.fd)
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self._watcher_init(self._watcher, self._watcher_callback, vfd, self._watcher.events)
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fd = property(_get_fd, _set_fd)
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def _get_events(self):
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return self._watcher.events
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@_base.not_while_active
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def _set_events(self, events):
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self._watcher_init(self._watcher, self._watcher_callback, self._watcher.fd, events)
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events = property(_get_events, _set_events)
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@property
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def events_str(self):
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return _events_to_str(self._watcher.events)
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def _format(self):
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return ' fd=%s events=%s' % (self.fd, self.events_str)
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class timer(_base.TimerMixin, watcher):
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@property
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def at(self):
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return self._watcher.at
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def again(self, callback, *args, **kw):
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# Exactly the same as start(), just with a different initializer
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# function
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self._watcher_start = libev.ev_timer_again
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try:
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self.start(callback, *args, **kw)
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finally:
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del self._watcher_start
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class signal(_base.SignalMixin, watcher):
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pass
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class idle(_base.IdleMixin, watcher):
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pass
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class prepare(_base.PrepareMixin, watcher):
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pass
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class check(_base.CheckMixin, watcher):
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pass
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class fork(_base.ForkMixin, watcher):
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pass
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class async_(_base.AsyncMixin, watcher):
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def send(self):
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libev.ev_async_send(self.loop._ptr, self._watcher)
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@property
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def pending(self):
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return self._watcher is not None and bool(libev.ev_async_pending(self._watcher))
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# Provide BWC for those that have async
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locals()['async'] = async_
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class _ClosedWatcher(object):
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__slots__ = ('pid', 'rpid', 'rstatus')
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def __init__(self, other):
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self.pid = other.pid
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self.rpid = other.rpid
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self.rstatus = other.rstatus
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def __bool__(self):
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return False
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__nonzero__ = __bool__
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class child(_base.ChildMixin, watcher):
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_watcher_type = 'child'
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def close(self):
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# Capture the properties we defer to our _watcher, because
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# we're about to discard it.
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closed_watcher = _ClosedWatcher(self._watcher)
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super(child, self).close()
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self._watcher = closed_watcher
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@property
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def pid(self):
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return self._watcher.pid
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@property
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def rpid(self):
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return self._watcher.rpid
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@rpid.setter
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def rpid(self, value):
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self._watcher.rpid = value
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@property
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def rstatus(self):
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return self._watcher.rstatus
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@rstatus.setter
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def rstatus(self, value):
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self._watcher.rstatus = value
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class stat(_base.StatMixin, watcher):
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_watcher_type = 'stat'
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@property
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def attr(self):
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if not self._watcher.attr.st_nlink:
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return
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return self._watcher.attr
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@property
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def prev(self):
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if not self._watcher.prev.st_nlink:
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return
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return self._watcher.prev
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@property
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def interval(self):
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return self._watcher.interval
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