1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
from twisted.internet import reactor, error
def listen_tcp(portrange, host, factory):
"""Like reactor.listenTCP but tries different ports in a range."""
assert len(portrange) <= 2, "invalid portrange: %s" % portrange
if not hasattr(portrange, '__iter__'):
return reactor.listenTCP(portrange, factory, interface=host)
if not portrange:
return reactor.listenTCP(0, factory, interface=host)
if len(portrange) == 1:
return reactor.listenTCP(portrange[0], factory, interface=host)
for x in range(portrange[0], portrange[1]+1):
try:
return reactor.listenTCP(x, factory, interface=host)
except error.CannotListenError:
if x == portrange[1]:
raise
class CallLaterOnce(object):
"""Schedule a function to be called in the next reactor loop, but only if
it hasn't been already scheduled since the last time it run.
"""
def __init__(self, func, *a, **kw):
self._func = func
self._a = a
self._kw = kw
self._call = None
def schedule(self, delay=0):
if self._call is None:
self._call = reactor.callLater(delay, self)
def cancel(self):
if self._call:
self._call.cancel()
def __call__(self):
self._call = None
return self._func(*self._a, **self._kw)
|
