def wait_on_socket(socket, watcher, timeout_exc=None):
if socket is None or watcher is None:
# test__hub TestCloseSocketWhilePolling, on Python 2; Python 3
# catches the EBADF differently.
raise ConcurrentObjectUseError("The socket has already been closed by another greenlet")
_primitive_wait(watcher, socket.timeout,
timeout_exc if timeout_exc is not None else _NONE,
socket.hub)
def get(self):
"""If a value/an exception is stored, return/raise it. Otherwise until switch() or throw() is called."""
if self._exception is not _NONE:
if self._exception is None:
return self.value
getcurrent().throw(*self._exception) # pylint:disable=undefined-variable
else:
if self.greenlet is not None:
raise ConcurrentObjectUseError('This Waiter is already used by %r' % (self.greenlet, ))
self.greenlet = getcurrent() # pylint:disable=undefined-variable
try:
return self.hub.switch()
finally:
self.greenlet = None
def _primitive_wait(watcher, timeout, timeout_exc, hub):
if watcher.callback is not None:
raise ConcurrentObjectUseError(
'This socket is already used by another greenlet: %r' %
(watcher.callback, ))
if hub is None:
hub = get_hub()
if timeout is None:
hub.wait(watcher)
return
timeout = Timeout._start_new_or_dummy(
timeout, (timeout_exc if timeout_exc is not _NONE or timeout is None
else _timeout_error('timed out')))
with timeout:
hub.wait(watcher)
