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puffin.py
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puffin.py
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# vim: fileencoding=utf8:et:sw=4:ts=8:sts=4
import errno
import fcntl
import os
import resource
import select
import socket
from penguin import fds
from greenlet import greenlet
getcurrent = greenlet.getcurrent
main_greenlet = getcurrent()
while main_greenlet.parent:
main_greenlet = main_greenlet.parent
_paused = []
_sleeping = [None] * resource.getrlimit(resource.RLIMIT_NOFILE)[1]
_ep = None
def _getep():
global _ep
if _ep is None:
_ep = select.epoll()
return _ep
def schedule(target=None, args=(), kwargs=None):
if target is None:
return lambda f: schedule(f, args, kwargs)
if isinstance(target, greenlet) or target is main_greenlet:
glet = target
else:
glet = scheduled_greenlet(target, args, kwargs)
_paused.append((glet, None, None))
return target
def _timerfd_prefix(fd, events):
os.close(fd)
def schedule_in(seconds, target=None, args=(), kwargs=None):
if target is None:
return lambda f: schedule_in(seconds, f, args, kwargs)
if isinstance(target, greenlet) or target is main_greenlet:
glet = target
else:
glet = scheduled_greenlet(target, args, kwargs, _timerfd_prefix)
tfd = fds.timerfd_create(fds.CLOCK_MONOTONIC, fds.TFD_NONBLOCK)
fds.timerfd_settime(tfd, seconds)
_sleeping[tfd] = glet
_getep().register(tfd, select.EPOLLIN)
return target
def wait(fd, mask=select.EPOLLIN|select.EPOLLOUT):
_sleeping[fd] = getcurrent()
_getep().register(fd, mask)
result_fd, events = mainloop.switch()
return events
def wait_multi(fd_events_pairs):
current = getcurrent()
ep = _getep()
reg = ep.register
unreg = ep.unregister
sl = _sleeping
for fd, evs in fd_events_pairs:
sl[fd] = current
reg(fd, evs)
result_fd, events = mainloop.switch()
for fd, evs in fd_events_pairs:
sl[fd] = None
unreg(fd)
return result_fd, events
def scheduled_greenlet(func, args=(), kwargs=None, prefix=None):
def stack_top(fd, events):
if prefix is not None:
prefix(fd, events)
func(*args, **(kwargs or {}))
return greenlet(stack_top, parent=mainloop)
def pause():
_paused.append((getcurrent(), None, None))
mainloop.switch()
def pause_for(seconds):
tfd = fds.timerfd_create(fds.CLOCK_MONOTONIC, fds.TFD_NONBLOCK)
fds.timerfd_settime(tfd, seconds)
_sleeping[tfd] = getcurrent()
_getep().register(tfd, select.EPOLLIN)
fd, events = mainloop.switch()
os.close(fd)
@greenlet
def mainloop():
global _paused
ep = _getep()
unreg = ep.unregister
while 1:
ready = _paused
_paused = []
if ready:
timeout = 0
else:
timeout = -1
for fd, events in _getep().poll(timeout):
glet = _sleeping[fd]
unreg(fd)
if glet is not None:
ready.append((glet, fd, events))
for glet, fd, events in ready:
glet.switch(fd, events)
# give mainloop a chance to get into its loop,
# quick before anything else can go wrong
pause()
class Socket(object):
__slots__ = ('_sock', '_fileno')
def _nonblock(self):
fl = fcntl.fcntl(self._fileno, fcntl.F_GETFL)
if fl & os.O_NONBLOCK == 0:
fcntl.fcntl(self._fileno, fcntl.F_SETFL, fl | os.O_NONBLOCK)
@classmethod
def fromsock(cls, sock):
self = object.__new__(cls)
self._sock = sock
self._fileno = sock.fileno()
self._nonblock()
return self
def __init__(self, family=socket.AF_INET, type_=socket.SOCK_STREAM,
proto=socket.IPPROTO_TCP):
sock = self._sock = socket._realsocket(family, type_, proto)
fileno = self._fileno = sock.fileno()
self._nonblock()
def accept(self):
while 1:
try:
client, addr = self._sock.accept()
return self.fromsock(client), addr
except socket.error, exc:
if exc.args[0] != errno.EAGAIN:
raise
wait(self._fileno, select.EPOLLIN)
def bind(self, addr):
return self._sock.bind(addr)
def listen(self, backlog):
return self._sock.listen(backlog)
def setsockopt(self, level, optname, value):
return self._sock.setsockopt(level, optname, value)
def close(self):
os.close(self._fileno)
def recv(self, length, flags=0):
while 1:
try:
return self._sock.recv(length, flags)
except socket.error, exc:
if exc.args[0] != errno.EAGAIN:
raise
wait(self._fileno, select.EPOLLIN)
def send(self, data, flags=0):
while 1:
try:
return self._sock.send(data)
except socket.error, exc:
if exc.args[0] != errno.EAGAIN:
raise
wait(self._fileno, select.EPOLLOUT)
def sendall(self, data, flags=0):
length = len(data)
sent = self.send(data, flags)
while sent < length:
sent += self.send(data[sent:], flags)