87 lines
2.7 KiB
Python
87 lines
2.7 KiB
Python
|
import eventlet
|
||
|
|
from eventlet.hubs import get_hub
|
||
|
|
__select = eventlet.patcher.original('select')
|
||
|
|
error = __select.error
|
||
|
|
|
||
|
|
|
||
|
|
__patched__ = ['select']
|
||
|
|
__deleted__ = ['devpoll', 'poll', 'epoll', 'kqueue', 'kevent']
|
||
|
|
|
||
|
|
|
||
|
|
def get_fileno(obj):
|
||
|
|
# The purpose of this function is to exactly replicate
|
||
|
|
# the behavior of the select module when confronted with
|
||
|
|
# abnormal filenos; the details are extensively tested in
|
||
|
|
# the stdlib test/test_select.py.
|
||
|
|
try:
|
||
|
|
f = obj.fileno
|
||
|
|
except AttributeError:
|
||
|
|
if not isinstance(obj, int):
|
||
|
|
raise TypeError("Expected int or long, got %s" % type(obj))
|
||
|
|
return obj
|
||
|
|
else:
|
||
|
|
rv = f()
|
||
|
|
if not isinstance(rv, int):
|
||
|
|
raise TypeError("Expected int or long, got %s" % type(rv))
|
||
|
|
return rv
|
||
|
|
|
||
|
|
|
||
|
|
def select(read_list, write_list, error_list, timeout=None):
|
||
|
|
# error checking like this is required by the stdlib unit tests
|
||
|
|
if timeout is not None:
|
||
|
|
try:
|
||
|
|
timeout = float(timeout)
|
||
|
|
except ValueError:
|
||
|
|
raise TypeError("Expected number for timeout")
|
||
|
|
hub = get_hub()
|
||
|
|
timers = []
|
||
|
|
current = eventlet.getcurrent()
|
||
|
|
if hub.greenlet is current:
|
||
|
|
raise RuntimeError('do not call blocking functions from the mainloop')
|
||
|
|
ds = {}
|
||
|
|
for r in read_list:
|
||
|
|
ds[get_fileno(r)] = {'read': r}
|
||
|
|
for w in write_list:
|
||
|
|
ds.setdefault(get_fileno(w), {})['write'] = w
|
||
|
|
for e in error_list:
|
||
|
|
ds.setdefault(get_fileno(e), {})['error'] = e
|
||
|
|
|
||
|
|
listeners = []
|
||
|
|
|
||
|
|
def on_read(d):
|
||
|
|
original = ds[get_fileno(d)]['read']
|
||
|
|
current.switch(([original], [], []))
|
||
|
|
|
||
|
|
def on_write(d):
|
||
|
|
original = ds[get_fileno(d)]['write']
|
||
|
|
current.switch(([], [original], []))
|
||
|
|
|
||
|
|
def on_timeout2():
|
||
|
|
current.switch(([], [], []))
|
||
|
|
|
||
|
|
def on_timeout():
|
||
|
|
# ensure that BaseHub.run() has a chance to call self.wait()
|
||
|
|
# at least once before timed out. otherwise the following code
|
||
|
|
# can time out erroneously.
|
||
|
|
#
|
||
|
|
# s1, s2 = socket.socketpair()
|
||
|
|
# print(select.select([], [s1], [], 0))
|
||
|
|
timers.append(hub.schedule_call_global(0, on_timeout2))
|
||
|
|
|
||
|
|
if timeout is not None:
|
||
|
|
timers.append(hub.schedule_call_global(timeout, on_timeout))
|
||
|
|
try:
|
||
|
|
for k, v in ds.items():
|
||
|
|
if v.get('read'):
|
||
|
|
listeners.append(hub.add(hub.READ, k, on_read, current.throw, lambda: None))
|
||
|
|
if v.get('write'):
|
||
|
|
listeners.append(hub.add(hub.WRITE, k, on_write, current.throw, lambda: None))
|
||
|
|
try:
|
||
|
|
return hub.switch()
|
||
|
|
finally:
|
||
|
|
for l in listeners:
|
||
|
|
hub.remove(l)
|
||
|
|
finally:
|
||
|
|
for t in timers:
|
||
|
|
t.cancel()
|