def poll(self, timeout=0.0):
"""Modified version of poll() from asyncore module"""
if self.sock_map is None:
Log.warning("Socket map is not registered to Gateway Looper")
readable_lst = []
writable_lst = []
error_lst = []
if self.sock_map is not None:
for fd, obj in self.sock_map.items():
is_r = obj.readable()
is_w = obj.writable()
if is_r:
readable_lst.append(fd)
if is_w and not obj.accepting:
writable_lst.append(fd)
if is_r or is_w:
error_lst.append(fd)
# Add wakeup fd
readable_lst.append(self.pipe_r)
Log.debug("Will select() with timeout: " + str(timeout) +
", with map: " + str(self.sock_map))
try:
readable_lst, writable_lst, error_lst = \
select.select(readable_lst, writable_lst, error_lst, timeout)
except select.error as err:
Log.debug("Trivial error: " + str(err))
if err.args[0] != errno.EINTR:
raise
else:
return
Log.debug("Selected [r]: " + str(readable_lst) + " [w]: " +
str(writable_lst) + " [e]: " + str(error_lst))
if self.pipe_r in readable_lst:
Log.debug("Read from pipe")
os.read(self.pipe_r, 1024)
readable_lst.remove(self.pipe_r)
if self.sock_map is not None:
for fd in readable_lst:
obj = self.sock_map.get(fd)
if obj is None:
continue
asyncore.read(obj)
for fd in writable_lst:
obj = self.sock_map.get(fd)
if obj is None:
continue
asyncore.write(obj)
for fd in error_lst:
obj = self.sock_map.get(fd)
if obj is None:
continue
# pylint: disable=W0212
asyncore._exception(obj)
def handle_poll_results(self, msg):
if "error" in msg:
print "I don't know how we handle errors: %s" % (msg["error"], )
return
r, w, e = msg["fds"]
map = self.map
for fd in r:
obj = map.get(fd)
if obj is None:
continue
asyncore.read(obj)
for fd in w:
obj = map.get(fd)
if obj is None:
continue
asyncore.write(obj)
for fd in e:
obj = map.get(fd)
if obj is None:
continue
asyncore._exception(obj)
def handle_poll_results(self, msg):
if "error" in msg:
print "I don't know how we handle errors: %s" % (msg["error"],)
return
r, w, e = msg["fds"]
map = self.map
for fd in r:
obj = map.get(fd)
if obj is None:
continue
asyncore.read(obj)
for fd in w:
obj = map.get(fd)
if obj is None:
continue
asyncore.write(obj)
for fd in e:
obj = map.get(fd)
if obj is None:
continue
asyncore._exception(obj)
def poll(self, timeout=0.0):
"""Modified version of poll() from asyncore module"""
if self.sock_map is None:
Log.warning("Socket map is not registered to Gateway Looper")
readable_lst = []
writable_lst = []
error_lst = []
if self.sock_map is not None:
for fd, obj in self.sock_map.items():
is_r = obj.readable()
is_w = obj.writable()
if is_r:
readable_lst.append(fd)
if is_w and not obj.accepting:
writable_lst.append(fd)
if is_r or is_w:
error_lst.append(fd)
# Add wakeup fd
readable_lst.append(self.pipe_r)
Log.debug("Will select() with timeout: " + str(timeout) + ", with map: " + str(self.sock_map))
try:
readable_lst, writable_lst, error_lst = \
select.select(readable_lst, writable_lst, error_lst, timeout)
except select.error as err:
Log.debug("Trivial error: " + str(err))
if err.args[0] != errno.EINTR:
raise
else:
return
Log.debug("Selected [r]: " + str(readable_lst) +
" [w]: " + str(writable_lst) + " [e]: " + str(error_lst))
if self.pipe_r in readable_lst:
Log.debug("Read from pipe")
os.read(self.pipe_r, 1024)
readable_lst.remove(self.pipe_r)
if self.sock_map is not None:
for fd in readable_lst:
obj = self.sock_map.get(fd)
if obj is None:
continue
asyncore.read(obj)
for fd in writable_lst:
obj = self.sock_map.get(fd)
if obj is None:
continue
asyncore.write(obj)
for fd in error_lst:
obj = self.sock_map.get(fd)
if obj is None:
continue
# pylint: disable=W0212
asyncore._exception(obj)
def poll(timeout=0.0, map=None, mdisp=None):
if map is None:
map = asyncore.socket_map
if mdisp is None:
mdisp = multi_dispatcher
if map:
if mdisp.timeout != -1:
timeout = min(timeout, mdisp.timeout/1000.0)
r = []; w = []; e = []
for fd, obj in map.items():
is_r = obj.readable()
is_w = obj.writable()
if is_r:
r.append(fd)
if is_w:
w.append(fd)
if is_r or is_w:
e.append(fd)
if [] == r == w == e:
if timeout > 0:
time.sleep(timeout)
else:
try:
r, w, e = select.select(r, w, e, timeout)
except select.error, err:
if err[0] != EINTR:
raise
else:
return
if [] == r == w == e:
mdisp.socket_action(SOCKET_TIMEOUT, 0)
return
for fd in r:
obj = map.get(fd)
if obj is None:
continue
asyncore.read(obj)
for fd in w:
obj = map.get(fd)
if obj is None:
continue
asyncore.write(obj)
for fd in e:
obj = map.get(fd)
if obj is None:
continue
asyncore._exception(obj)
def test_readwriteexc(self):
tr1 = exitingdummy()
self.assertRaises(asyncore.ExitNow, asyncore.read, tr1)
self.assertRaises(asyncore.ExitNow, asyncore.write, tr1)
self.assertRaises(asyncore.ExitNow, asyncore._exception, tr1)
tr2 = crashingdummy()
asyncore.read(tr2)
self.assertEqual(tr2.error_handled, True)
tr2 = crashingdummy()
asyncore.write(tr2)
self.assertEqual(tr2.error_handled, True)
tr2 = crashingdummy()
asyncore._exception(tr2)
self.assertEqual(tr2.error_handled, True)
def poll(map, timeout=0.0):
"""Asyncore poll function."""
if map:
r = []
w = []
e = []
for fd, obj in map.items():
is_r = obj.readable()
is_w = obj.writable()
if is_r:
r.append(fd)
if is_w:
w.append(fd)
if is_r or is_w:
e.append(fd)
if [] == r == w == e:
time.sleep(timeout)
else:
try:
if use_select_emulation:
r, w, e = clewn_select(r, w, e, timeout)
else:
r, w, e = select.select(r, w, e, timeout)
except select.error, err:
if err[0] != errno.EINTR:
raise
else:
return
for fd in r:
obj = map.get(fd)
if obj is None:
continue
asyncore.read(obj)
for fd in w:
obj = map.get(fd)
if obj is None:
continue
asyncore.write(obj)
for fd in e:
obj = map.get(fd)
if obj is None:
continue
asyncore._exception(obj)
def run(self, timeout=0.0):
"""Run the asyncore poll function."""
if self.socket_map:
r = []
w = []
e = []
for fd, obj in self.socket_map.items():
is_r = obj.readable()
is_w = obj.writable()
if is_r:
r.append(fd)
if is_w:
w.append(fd)
if is_r or is_w:
e.append(fd)
if [] == r == w == e:
time.sleep(timeout)
else:
try:
if use_select_emulation:
r, w, e = clewn_select(r, w, e, timeout, self)
else:
r, w, e = select.select(r, w, e, timeout)
except select.error, err:
if err[0] != errno.EINTR:
raise
else:
return
for fd in r:
obj = self.socket_map.get(fd)
if obj is None:
continue
asyncore.read(obj)
for fd in w:
obj = self.socket_map.get(fd)
if obj is None:
continue
asyncore.write(obj)
for fd in e:
obj = self.socket_map.get(fd)
if obj is None:
continue
asyncore._exception(obj)
def test_readwriteexc(self):
# Check exception handling behavior of read, write and _exception
# check that ExitNow exceptions in the object handler method
# bubbles all the way up through asyncore read/write/_exception calls
tr1 = exitingdummy()
self.assertRaises(asyncore.ExitNow, asyncore.read, tr1)
self.assertRaises(asyncore.ExitNow, asyncore.write, tr1)
self.assertRaises(asyncore.ExitNow, asyncore._exception, tr1)
# check that an exception other than ExitNow in the object handler
# method causes the handle_error method to get called
tr2 = crashingdummy()
asyncore.read(tr2)
self.assertEqual(tr2.error_handled, True)
tr2 = crashingdummy()
asyncore.write(tr2)
self.assertEqual(tr2.error_handled, True)
tr2 = crashingdummy()
asyncore._exception(tr2)
self.assertEqual(tr2.error_handled, True)
def test_readwriteexc(self):
# Check exception handling behavior of read, write and _exception
# check that ExitNow exceptions in the object handler method
# bubbles all the way up through asyncore read/write/_exception calls
tr1 = exitingdummy()
self.assertRaises(asyncore.ExitNow, asyncore.read, tr1)
self.assertRaises(asyncore.ExitNow, asyncore.write, tr1)
self.assertRaises(asyncore.ExitNow, asyncore._exception, tr1)
# check that an exception other than ExitNow in the object handler
# method causes the handle_error method to get called
tr2 = crashingdummy()
asyncore.read(tr2)
self.assertEqual(tr2.error_handled, True)
tr2 = crashingdummy()
asyncore.write(tr2)
self.assertEqual(tr2.error_handled, True)
tr2 = crashingdummy()
asyncore._exception(tr2)
self.assertEqual(tr2.error_handled, True)
def update_event(self, inp=-1):
self.set_output_val(0, asyncore._exception(self.input(0)))
class GatewayLooper(EventLooper):
"""A GatewayLooper, inheriting EventLooper
It is a class wrapping Python's asyncore module (and selector) to dispatch events.
This class can be used as a looper for an ``asyncore.dispatcher`` class, instead of calling
``asyncore.loop()``.
As it is a subclass of EventLooper, it will execute in a while loop until
the ``exit_loop()`` is called.
In order to use this class, users first need to specify a socket map that maps from
a file descriptor to ``asyncore.dispatcher`` class, using ``prepare_map()`` method.
The GatewayLooper will dispatch ready events that are in the specified map.
"""
def __init__(self, socket_map):
"""Initializes a GatewayLooper instance
:param socket_map: socket map used for asyncore.dispatcher
"""
super(GatewayLooper, self).__init__()
self.sock_map = socket_map
# Pipe used for wake up select
self.pipe_r, self.pipe_w = os.pipe()
self.started = time.time()
Log.debug("Gateway Looper started time: " + str(time.asctime()))
def do_wait(self):
next_timeout = self._get_next_timeout_interval()
if next_timeout > 0:
self.poll(timeout=next_timeout)
else:
self.poll(timeout=0.0)
def wake_up(self):
os.write(self.pipe_w, "\n")
Log.debug("Wake up called")
def on_exit(self):
super(GatewayLooper, self).on_exit()
os.close(self.pipe_r)
os.close(self.pipe_w)
# pylint: disable=too-many-branches
def poll(self, timeout=0.0):
"""Modified version of poll() from asyncore module"""
if self.sock_map is None:
Log.warning("Socket map is not registered to Gateway Looper")
readable_lst = []
writable_lst = []
error_lst = []
if self.sock_map is not None:
for fd, obj in self.sock_map.items():
is_r = obj.readable()
is_w = obj.writable()
if is_r:
readable_lst.append(fd)
if is_w and not obj.accepting:
writable_lst.append(fd)
if is_r or is_w:
error_lst.append(fd)
# Add wakeup fd
readable_lst.append(self.pipe_r)
Log.debug("Will select() with timeout: " + str(timeout) +
", with map: " + str(self.sock_map))
try:
readable_lst, writable_lst, error_lst = \
select.select(readable_lst, writable_lst, error_lst, timeout)
except select.error, err:
Log.debug("Trivial error: " + err.message)
if err.args[0] != errno.EINTR:
raise
else:
return
Log.debug("Selected [r]: " + str(readable_lst) + " [w]: " +
str(writable_lst) + " [e]: " + str(error_lst))
if self.pipe_r in readable_lst:
Log.debug("Read from pipe")
os.read(self.pipe_r, 1024)
readable_lst.remove(self.pipe_r)
if self.sock_map is not None:
for fd in readable_lst:
obj = self.sock_map.get(fd)
if obj is None:
continue
asyncore.read(obj)
for fd in writable_lst:
obj = self.sock_map.get(fd)
if obj is None:
continue
asyncore.write(obj)
for fd in error_lst:
obj = self.sock_map.get(fd)
if obj is None:
continue
# pylint: disable=W0212
asyncore._exception(obj)
