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|
# File descriptor and timer event helper
#
# Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import select, time, math
import greenlet
class ReactorTimer:
def __init__(self, callback, waketime):
self.callback = callback
self.waketime = waketime
class ReactorFileHandler:
def __init__(self, fd, callback):
self.fd = fd
self.callback = callback
def fileno(self):
return self.fd
class ReactorGreenlet(greenlet.greenlet):
def __init__(self, run):
greenlet.greenlet.__init__(self, run=run)
self.timer = None
class SelectReactor:
NOW = 0.
NEVER = 9999999999999999.
def __init__(self):
self._fds = []
self._timers = []
self._next_timer = self.NEVER
self._process = False
self._g_dispatch = None
self._greenlets = []
# Timers
def _note_time(self, t):
nexttime = t.waketime
if nexttime < self._next_timer:
self._next_timer = nexttime
def update_timer(self, t, nexttime):
t.waketime = nexttime
self._note_time(t)
def register_timer(self, callback, waketime = NEVER):
handler = ReactorTimer(callback, waketime)
timers = list(self._timers)
timers.append(handler)
self._timers = timers
self._note_time(handler)
return handler
def unregister_timer(self, handler):
timers = list(self._timers)
timers.pop(timers.index(handler))
self._timers = timers
def _check_timers(self, eventtime):
if eventtime < self._next_timer:
return min(1., max(.001, self._next_timer - eventtime))
self._next_timer = self.NEVER
g_dispatch = self._g_dispatch
for t in self._timers:
if eventtime >= t.waketime:
t.waketime = self.NEVER
t.waketime = t.callback(eventtime)
if g_dispatch is not self._g_dispatch:
self._end_greenlet(g_dispatch)
return 0.
self._note_time(t)
if eventtime >= self._next_timer:
return 0.
return min(1., max(.001, self._next_timer - time.time()))
# Greenlets
def pause(self, waketime):
g = greenlet.getcurrent()
if g is not self._g_dispatch:
return self._g_dispatch.switch(waketime)
if self._greenlets:
g_next = self._greenlets.pop()
else:
g_next = ReactorGreenlet(run=self._dispatch_loop)
g_next.parent = g.parent
g.timer = self.register_timer(g.switch, waketime)
return g_next.switch()
def _end_greenlet(self, g_old):
self._greenlets.append(g_old)
self.unregister_timer(g_old.timer)
g_old.timer = None
self._g_dispatch.switch(self.NEVER)
self._g_dispatch = g_old
# File descriptors
def register_fd(self, fd, callback):
handler = ReactorFileHandler(fd, callback)
self._fds.append(handler)
return handler
def unregister_fd(self, handler):
self._fds.pop(self._fds.index(handler))
# Main loop
def _dispatch_loop(self):
self._process = True
self._g_dispatch = g_dispatch = greenlet.getcurrent()
eventtime = time.time()
while self._process:
timeout = self._check_timers(eventtime)
res = select.select(self._fds, [], [], timeout)
eventtime = time.time()
for fd in res[0]:
fd.callback(eventtime)
if g_dispatch is not self._g_dispatch:
self._end_greenlet(g_dispatch)
break
self._g_dispatch = None
def run(self):
g_next = ReactorGreenlet(run=self._dispatch_loop)
g_next.switch()
def end(self):
self._process = False
class PollReactor(SelectReactor):
def __init__(self):
SelectReactor.__init__(self)
self._poll = select.poll()
self._fds = {}
# File descriptors
def register_fd(self, fd, callback):
handler = ReactorFileHandler(fd, callback)
fds = self._fds.copy()
fds[fd] = callback
self._fds = fds
self._poll.register(handler, select.POLLIN | select.POLLHUP)
return handler
def unregister_fd(self, handler):
self._poll.unregister(handler)
fds = self._fds.copy()
del fds[handler.fd]
self._fds = fds
# Main loop
def _dispatch_loop(self):
self._process = True
self._g_dispatch = g_dispatch = greenlet.getcurrent()
eventtime = time.time()
while self._process:
timeout = int(math.ceil(self._check_timers(eventtime) * 1000.))
res = self._poll.poll(timeout)
eventtime = time.time()
for fd, event in res:
self._fds[fd](eventtime)
if g_dispatch is not self._g_dispatch:
self._end_greenlet(g_dispatch)
break
self._g_dispatch = None
class EPollReactor(SelectReactor):
def __init__(self):
SelectReactor.__init__(self)
self._epoll = select.epoll()
self._fds = {}
# File descriptors
def register_fd(self, fd, callback):
handler = ReactorFileHandler(fd, callback)
fds = self._fds.copy()
fds[fd] = callback
self._fds = fds
self._epoll.register(fd, select.EPOLLIN | select.EPOLLHUP)
return handler
def unregister_fd(self, handler):
self._epoll.unregister(handler.fd)
fds = self._fds.copy()
del fds[handler.fd]
self._fds = fds
# Main loop
def _dispatch_loop(self):
self._process = True
self._g_dispatch = g_dispatch = greenlet.getcurrent()
eventtime = time.time()
while self._process:
timeout = self._check_timers(eventtime)
res = self._epoll.poll(timeout)
eventtime = time.time()
for fd, event in res:
self._fds[fd](eventtime)
if g_dispatch is not self._g_dispatch:
self._end_greenlet(g_dispatch)
break
self._g_dispatch = None
# Use the poll based reactor if it is available
try:
select.poll
Reactor = PollReactor
except:
Reactor = SelectReactor
|
