def _lib_out(router):
if globals(
)['shutdown_in_progress'] is False: # We don't want to add more shutdown notices to the queue...
globals()['shutdown_in_progress'] = True
event.timeout(
router.broadcast_shutdown(), event.abort
) # for each server, add one second onto the shutdown timeout..
def test_abort(self):
print 'test_abort'
def __time_cb():
raise NotImplementedError, 'abort failed!'
event.timeout(5, __time_cb)
event.timeout(1, event.abort)
event.dispatch()
def test_timeout2(self):
def __timeout2_cb(start, secs):
dur = int(time.time() - start)
assert dur == secs, 'timeout2 failed'
print 'test_timeout2'
event.timeout(5, __timeout2_cb, time.time(), 5)
event.dispatch()
def test_timeout2(self):
def __timeout2_cb(start, secs):
dur = int(time.time() - start)
assert dur == secs, 'timeout2 failed'
print 'test_timeout2'
event.timeout(5, __timeout2_cb, time.time(), 5)
event.dispatch()
def test_signal2(self):
def __signal2_cb(sig):
if sig:
event.abort()
else:
os.kill(os.getpid(), signal.SIGUSR1)
print 'test_signal2'
event.signal(signal.SIGUSR1, __signal2_cb, signal.SIGUSR1)
event.timeout(2, __signal2_cb)
def test_abort(self):
print 'test_abort'
def __time_cb():
raise NotImplementedError, 'abort failed!'
event.timeout(5, __time_cb)
event.timeout(1, event.abort)
event.dispatch()
def test_exception(self):
print 'test_exception'
def __bad_cb(foo):
raise NotImplementedError, foo
event.timeout(0, __bad_cb, 'bad callback')
try:
event.dispatch()
except NotImplementedError:
pass
def test_signal2(self):
def __signal2_cb(sig):
if sig:
event.abort()
else:
os.kill(os.getpid(), signal.SIGUSR1)
print 'test_signal2'
event.signal(signal.SIGUSR1, __signal2_cb, signal.SIGUSR1)
event.timeout(2, __signal2_cb)
def test_exception(self):
print 'test_exception'
def __bad_cb(foo):
raise NotImplementedError, foo
event.timeout(0, __bad_cb, 'bad callback')
try:
event.dispatch()
except NotImplementedError:
pass
def test_callback_exception(self):
print 'test_callback_exception'
def __raise_cb(exc):
raise exc
def __raise_catch_cb(exc):
try:
raise exc
except:
pass
event.timeout(0, __raise_cb, StandardError())
event.timeout(0, __raise_catch_cb, Exception())
self.assertRaises(StandardError, event.dispatch)
def test_thread(self):
print 'test_thread'
def __time_cb(d):
assert d['count'] == 3
def __time_thread(count, d):
for i in range(count):
time.sleep(1)
d['count'] += 1
d = { 'count': 0 }
thread.start_new_thread(__time_thread, (3, d))
event.timeout(4, __time_cb, d)
event.dispatch()
def test_thread(self):
print 'test_thread'
def __time_cb(d):
assert d['count'] == 3
def __time_thread(count, d):
for i in range(count):
time.sleep(1)
d['count'] += 1
d = {'count': 0}
thread.start_new_thread(__time_thread, (3, d))
event.timeout(4, __time_cb, d)
event.dispatch()
def test_callback_exception(self):
print 'test_callback_exception'
def __raise_cb(exc):
raise exc
def __raise_catch_cb(exc):
try:
raise exc
except:
pass
event.timeout(0, __raise_cb, StandardError())
event.timeout(0, __raise_catch_cb, Exception())
self.assertRaises(StandardError, event.dispatch)
def read(self, timeout=None):
'''
Read from the transport. If no data is available, should return None.
The timeout is ignored as this returns only data that has already
been buffered locally.
'''
# NOTE: copying over this comment from Connection, because there is
# knowledge captured here, even if the details are stale
# Because of the timer callback to dataRead when we re-buffered,
# there's a chance that in between we've lost the socket. If that's
# the case, just silently return as some code elsewhere would have
# already notified us. That bug could be fixed by improving the
# message reading so that we consume all possible messages and ensure
# that only a partial message was rebuffered, so that we can rely on
# the next read event to read the subsequent message.
if not hasattr(self, '_sock'):
return None
# This is sort of a hack because we're faking that data is ready, but
# it works for purposes of supporting timeouts
if timeout:
if self._heartbeat_timeout:
self._heartbeat_timeout.delete()
self._heartbeat_timeout = \
event.timeout(timeout, self._sock_read_cb, self._sock)
elif self._heartbeat_timeout:
self._heartbeat_timeout.delete()
self._heartbeat_timeout = None
return self._sock.read()
def read(self, timeout=None):
'''
Read from the transport. If no data is available, should return None.
The timeout is ignored as this returns only data that has already
been buffered locally.
'''
# NOTE: copying over this comment from Connection, because there is
# knowledge captured here, even if the details are stale
# Because of the timer callback to dataRead when we re-buffered,
# there's a chance that in between we've lost the socket. If that's
# the case, just silently return as some code elsewhere would have
# already notified us. That bug could be fixed by improving the
# message reading so that we consume all possible messages and ensure
# that only a partial message was rebuffered, so that we can rely on
# the next read event to read the subsequent message.
if not hasattr(self, '_sock'):
return None
# This is sort of a hack because we're faking that data is ready, but
# it works for purposes of supporting timeouts
if timeout:
if self._heartbeat_timeout:
self._heartbeat_timeout.delete()
self._heartbeat_timeout = \
event.timeout(timeout, self._sock_read_cb, self._sock)
elif self._heartbeat_timeout:
self._heartbeat_timeout.delete()
self._heartbeat_timeout = None
return self._sock.read()
def activate(self):
"""Enable receive via multicast.
Joins multicast group and creates reactor.
"""
if self.is_active:
return
self.mc_socket = UdpSocket()
self.mc_socket.bind(self.dest_addr)
self.mc_socket.multicast_interface = self.dest_if
self.mc_socket.join_mcast_group(self.dest_addr[0])
self.mc_reactor = RmcReactor(self.mc_socket, self)
self.mc_reactor.add_read()
self._hb_timer = event.timeout(0.1, self._hb_timer_tick)
self._chk_timer = event.timeout(0.01, self._chk_timer_tick)
self.is_active = True
return
def _flag_activity(self):
"""
Flag that this socket is active.
"""
# is there a better way of reseting a timer?
if self._inactive_event:
self._inactive_event.delete()
self._inactive_event = event.timeout( self._inactive_timeout, self._protected_cb, self._inactive_cb )
def reset_heartbeat(self):
"""Reset heartbeat time to lowest value.
"""
if not self._hb_timer:
return
self._hb_timer.delete()
t_next = self._next_hb_time(True)
self._hb_timer = event.timeout(t_next, self._hb_timer_tick)
return t_next
def _set_read_cb(self, cb):
"""
Set the read callback. If there's data in the output buffer, immediately
setup a call.
"""
self._parent_read_cb = cb
#if self._read_buf.tell()>0 and self._parent_read_cb!=None and self._pending_read_cb_event==None:
if len(self._read_buf)>0 and self._parent_read_cb!=None and self._pending_read_cb_event==None:
self._pending_read_cb_event = \
event.timeout( 0, self._protected_cb, self._parent_read_timer_cb )
def _recv_close(self, method_frame):
self.connection._close_info = {
'reply_code': method_frame.args.read_short(),
'reply_text': method_frame.args.read_shortstr(),
'class_id': method_frame.args.read_short(),
'method_id': method_frame.args.read_short()
}
self._send_close_ok()
# Clear the socket close callback because we should be expecting it. The fact
# that it is called in practice means that we flush the data, rabbit processes
# and then closes the socket before the timer below fires. I don't know what
# this means, but it is surprising. - AW
if self.connection._sock != None:
self.connection._sock.close_cb = None
# Schedule the actual close for later so that handshake IO can take place.
# Even though it's scheduled at 0, it's queued after the frame IO
event.timeout(0, self.connection._close_socket)
# Likewise, call any potential close callback on a delay
event.timeout(0, self.connection._callback_close)
def connect(self, delay=0):
'''Connect.'''
# Ensure that the connection has cleaned up old resources. Do it immediately
# to be sure that output is buffered and no errors are raised.
try:
self._connection.logger.debug("disconnecting connection")
self._connection.disconnect()
except:
self._connection.logger.exception( "error while disconnecting" )
self._connection.logger.debug("Pending connect: %s", self._pending_connect)
if not self._pending_connect:
self._connection.logger.debug("Scheduling a connection in %s", delay)
self._pending_connect = event.timeout(delay, self._connect_cb)
def _recv_close(self, method_frame):
self.connection._close_info = {
'reply_code' : method_frame.args.read_short(),
'reply_text' : method_frame.args.read_shortstr(),
'class_id' : method_frame.args.read_short(),
'method_id' : method_frame.args.read_short()
}
self._send_close_ok()
# Clear the socket close callback because we should be expecting it. The fact
# that it is called in practice means that we flush the data, rabbit processes
# and then closes the socket before the timer below fires. I don't know what
# this means, but it is surprising. - AW
if self.connection._sock != None:
self.connection._sock.close_cb = None
# Schedule the actual close for later so that handshake IO can take place.
# Even though it's scheduled at 0, it's queued after the frame IO
event.timeout(0, self.connection._close_socket)
# Likewise, call any potential close callback on a delay
event.timeout(0, self.connection._callback_close)
def connect(self, delay=0):
'''Connect.'''
# Ensure that the connection has cleaned up old resources. Do it immediately
# to be sure that output is buffered and no errors are raised.
try:
self._connection.logger.debug("disconnecting connection")
self._connection.disconnect()
except:
self._connection.logger.exception("error while disconnecting")
self._connection.logger.debug("Pending connect: %s",
self._pending_connect)
if not self._pending_connect:
self._connection.logger.debug("Scheduling a connection in %s",
delay)
self._pending_connect = event.timeout(delay, self._connect_cb)
def set_write_timeout(self, tmo):
"""Set the timeout for write events to tmo seconds.
tmo is the timeout in seconds as float. If its <= 0 the
timeout is canceled.
On timeout the on_write_timeout mehtod is called.
"""
if self._write_timeout:
self._write_timeout.delete()
self._write_timeout = None
if not tmo or tmo <= 0.0:
# time out time less then 0 means cancel timeout
self._wr_tmo = 0.0
return
self._write_timeout = event.timeout(tmo, self.on_write_timeout)
self._wr_tmo = tmo
return
def set_inactive_timeout(self, t):
"""
Set the inactivity timeout. If is None or 0, there is no activity timeout.
If t>0 then socket will automatically close if there has been no activity
after t seconds (float supported). Will raise TypeError if <t> is invalid.
"""
if t==None or t==0:
if self._inactive_event:
self._inactive_event.delete()
self._inactive_event = None
self._inactive_timeout = 0
elif isinstance(t,(int,long,float)):
if self._inactive_event:
self._inactive_event.delete()
self._inactive_event = event.timeout( t, self._inactive_cb )
self._inactive_timeout = t
else:
raise TypeError( "invalid timeout %s"%(str(t)) )
def _connect_cb(self, timeout_at, *args, **kwargs):
'''
Local support for synch and asynch connect. Required because
`event.timeout` doesn't support kwargs. They are spec'd though so that
we can branch how exceptions are handled.
'''
err = self._sock.connect_ex( *args )
if not err:
self._peername = "%s:%d"%self._sock.getpeername()
self._read_event = event.read( self._sock, self._protected_cb, self._read_cb )
self._write_event = event.write( self._sock, self._protected_cb, self._write_cb )
if self._connect_event:
self._connect_event.delete()
self._connect_event = None
elif err in (errno.EINPROGRESS,errno.EALREADY):
# Only track timeout if we're about to re-schedule. Should only receive
# these on a non-blocking socket.
if isinstance(timeout_at,float) and time.time()>timeout_at:
self._error_msg = 'timeout connecting to %s'%str(args)
self.close()
return
if self._connect_event:
self._connect_event.delete()
# Checking every 100ms seems to be a reasonable amount of frequency. If
# requested this too can be configurable.
self._connect_event = event.timeout(0.1, self._connect_cb,
timeout_at, *args)
else:
if self._connect_event:
self._connect_event.delete()
self._error_msg = os.strerror(err)
serr = socket.error( err, self._error_msg )
if kwargs.get('immediate_raise'):
raise serr
else:
self._handle_error( serr )
def _read_cb(self):
"""
Read callback from libevent.
"""
# We should be able to use recv_into for speed and efficiency, but sadly
# this was broken after 2.6.1 http://bugs.python.org/issue7827
self._error_msg = "error reading from socket"
data = self._sock.recv( self.getsockopt(socket.SOL_SOCKET,socket.SO_RCVBUF) )
if len(data)>0:
if self._debug:
self._logger.debug( "read %d bytes from %s"%(len(data), self._peername) )
# 23 Feb 09 aaron - There are cases where the client will have started
# pushing data right away, and there's a chance that async handling of
# accept will cause data to be read before the callback function has been
# set. I prefer to ignore data if no read callback defined, but it's
# better to just limit the overall size of the input buffer then to use
# a synchronous callback to __parent_accept_cb.
# TODO: So what is the best way of handling this problem, and if sticking
# with a max input buffer size, what's the correct algorithm? Maybe better
# approach is to raise a notice to a callback and let the callback decide
# what to do.
self._flag_activity()
self._read_buf.extend( data )
if self._max_read_buffer and len(self._read_buf) > self._max_read_buffer:
if self._debug:
self._logger.debug( "buffer for %s overflowed!"%(self._peername) )
# Clear the input buffer so that the callback flush code isn't called in close
self._read_buf = bytearray()
self.close()
return None
# Callback asynchronously so that priority is given to libevent to
# allocate time slices.
if self._parent_read_cb!=None and self._pending_read_cb_event==None:
self._pending_read_cb_event = \
event.timeout( 0, self._protected_cb, self._parent_read_timer_cb )
else:
self.close()
return None
return True
def main(local_ip, mca):
my_sock = UdpSocket((local_ip, 0))
my_sock.send_buffer_size = 100000
mc_sock = UdpSocket(mca)
mc_sock.join_mcast_group(mca[0])
mc_sock.receive_buffer_size = 10000
mc_sock.send_buffer_size = 100000
sender = Sender()
handler = RmcProtocolHandler(my_sock, mc_sock)
handler.MAX_BACKLOG = 5000
handler.MAX_BURST = 5
handler.no_sync = True
## handler.add_action('__received_packet__', sender.on_incomming_packet)
## handler.add_action('__sent_packet__', sender.on_outgoing_packet)
handler.add_action('missing_heartbeat', sender.on_missing_sender)
handler.add_action('new_sender', sender.on_new_sender)
handler.add_action('new_packet', sender.on_new_packet)
handler.add_action('got_heartbeat', sender.on_heartbeat)
handler.add_action('got_nack', sender.on_nack)
handler.add_action('got_reset', sender.on_reset)
handler.add_action('got_lost', sender.on_lost)
handler.add_action('sent_heartbeat', sender.sent_heartbeat)
handler.add_action('sent_lost', sender.sent_lost)
handler.add_action('sent_nack', sender.sent_nack)
print 'SENDER STARTED', repr(handler.local_addr)
# spool first batch of packets
for n in range(3):
p = packet.Packet()
p.payload = 's: %d' % n
handler.send(p)
# delayed reset
p = packet.Packet(seq=200)
p.flags |= packet.RESET
p.payload = ''
event.timeout(2.0, send_p, [p], handler)
# more packets, fast!
pl = [ packet.Packet(payload=('%06d: ' % n + 'Z' * 80)) for n in xrange(50) ]
event.timeout(3.0, send_p, pl, handler)
# more packets, fast!
pl = [ packet.Packet(payload=('%06d: ' % n + 'Z' * 80)) for n in xrange(50, 550) ]
event.timeout(4.0, send_p, pl, handler)
try:
event.dispatch()
except KeyboardInterrupt:
pass
handler.finish()
now = time.time()
print '%.6f: DONE' % now
return
def _call_again(t, f, *args):
f(*args)
event.timeout(t, _call_again, t, f, *args).add()
def call_every(t, f, *args):
event.timeout(t, _call_again, t, f, *args).add()
def __init__(self, uc_socket, mc_socket=None):
"""Setup rmc handler.
uc_socket: UdpSocket bound to local unicast address
mc_socket: UdpSocket bound to multicast address, optional
Attributes:
mc_socket: UdpSocket bound to multicast address
uc_socket: UdpSocket bound to local unicast address
mc_reactor: RmcReactor for multicast address (receive only)
uc_reactor: RmcReactor for unicast address (receive/send)
dest_addr: ip/port of multicast channel
local_addr: ip/port for unicast
seq: current sequence no. for outgoing packets
no_sync: if True don't send NACKs on first heartbeat for a sender
silent : if True don't send data, never ever, just listen
"""
# create multicast socket
## self.mc_socket = UdpSocket((mc_addr[0], mc_addr[1]))
## self.mc_socket.multicast_interface = mc_interface
## self.mc_socket.join_mcast_group(mc_addr[0])
self.mc_socket = mc_socket
self.uc_socket = uc_socket
# create reactors for both sockets
# and attach them to this protocol handler
self.uc_reactor = RmcReactor(self.uc_socket, self)
self.local_addr = self.uc_socket.getsockname()
# if multicast socket is None
# sending will use the unicast socket as fallback
if mc_socket is None:
self.mc_reactor = self.uc_reactor
## self.mc_socket.multicast_interface = mc_interface
else:
self.mc_reactor = RmcReactor(mc_socket, self)
self.mc_socket.multicast_loop = True
# get/assign addresses
self.dest_addr = self.mc_socket.getsockname()
# send_buffer is a list of packets to send out
# send_prio_buffer is for outgoing packets w/ high priority
self._send_buffer = []
self._send_prio_buffer = []
# sequence counter for outgoing data packets
self.seq = 0
# remember last data packet sent
self._last_sent = None
# keep track of peers
self._peers = {}
# our outgoing backlog
self._backlog = []
# activate reactors
self.mc_reactor.add_read()
self.uc_reactor.add_read()
# initialize generator for hearbeat times
self._hb_gen = self._hb_generator()
self._hb_gen.next()
# mapping to keep track of event subscriptions
self._ev_handler = {}
# flag if write event is active
self._write_active = False
# flag when set, no sync on first heartbeat of a sender is done
self.no_sync = False
# flag when set, no data will be sent (ever!)
self._silent = False
# prepare continous timer ticks
self._hb_timer = event.timeout(0.1, self._hb_timer_tick)
self._chk_timer = event.timeout(0.01, self._chk_timer_tick)
# flag showing if this handler does receive data via multicast
self.is_active = True
return
def _hb_timer_tick(self):
self._hb_timer.delete()
t_next = self.on_heartbeat()
self._hb_timer = event.timeout(t_next, self._hb_timer_tick)
return
def schedule_call_global(self, seconds, cb, *args, **kwargs):
event_timeout = event.timeout(seconds, lambda : cb(*args, **kwargs) and None)
return event_wrapper(event_timeout)
def _chk_timer_tick(self):
self._chk_timer.delete()
self._check_sender_timeouts()
self._chk_timer = event.timeout(0.01, self._chk_timer_tick)
return
def _lib_out(router):
if globals()['shutdown_in_progress'] is False: # We don't want to add more shutdown notices to the queue...
globals()['shutdown_in_progress'] = True
event.timeout(router.broadcast_shutdown(), event.abort) # for each server, add one second onto the shutdown timeout..
def __init__(self, t, f, *args):
tm = event.timeout(t, f, *args)
tm.add()
self._approx_fire = time.time() + t
self._ev_timer = tm
def schedule_call_local(self, seconds, cb, *args, **kwargs):
timer = LocalTimer(cb, args, kwargs)
event_timeout = event.timeout(seconds, timer)
timer.impl = event_timeout
return timer
def schedule_call_local(self, seconds, cb, *args, **kwargs):
timer = LocalTimer(cb, args, kwargs)
event_timeout = event.timeout(seconds, timer)
timer.impl = event_timeout
return timer
def schedule_call_global(self, seconds, cb, *args, **kwargs):
event_timeout = event.timeout(seconds,
lambda: cb(*args, **kwargs) and None)
return event_wrapper(event_timeout)
