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import errno
import sys
from eventlet import patcher, support
from eventlet.hubs import hub
select = patcher.original('select')
time = patcher.original('time')
try:
BAD_SOCK = set((errno.EBADF, errno.WSAENOTSOCK))
except AttributeError:
BAD_SOCK = set((errno.EBADF,))
def is_available():
return hasattr(select, 'select')
class Hub(hub.BaseHub):
def _remove_bad_fds(self):
""" Iterate through fds, removing the ones that are bad per the
operating system.
"""
all_fds = list(self.listeners[self.READ]) + list(self.listeners[self.WRITE])
for fd in all_fds:
try:
select.select([fd], [], [], 0)
except select.error as e:
if support.get_errno(e) in BAD_SOCK:
self.remove_descriptor(fd)
def wait(self, seconds=None):
readers = self.listeners[self.READ]
writers = self.listeners[self.WRITE]
if not readers and not writers:
if seconds:
time.sleep(seconds)
return
reader_fds = list(readers)
writer_fds = list(writers)
all_fds = reader_fds + writer_fds
try:
r, w, er = select.select(reader_fds, writer_fds, all_fds, seconds)
except select.error as e:
if support.get_errno(e) == errno.EINTR:
return
elif support.get_errno(e) in BAD_SOCK:
self._remove_bad_fds()
return
else:
raise
for fileno in er:
readers.get(fileno, hub.noop).cb(fileno)
writers.get(fileno, hub.noop).cb(fileno)
for listeners, events in ((readers, r), (writers, w)):
for fileno in events:
try:
listeners.get(fileno, hub.noop).cb(fileno)
except self.SYSTEM_EXCEPTIONS:
raise
except:
self.squelch_exception(fileno, sys.exc_info())
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