class Messenger:
def __init__(self, mac, broadcast_address, broadcast_port, tcp_port, node_id=None, loop=None):
self._mac = mac
self._node_id = node_id
self._nodes = {}
self._lost_nodes = set()
self._loop = loop or asyncio.get_event_loop()
self._io_executor = AsyncExecutor(5, self._loop)
self._logger = logging.getLogger('Messenger')
self._logger.info('Creating messengers...')
if tcp_port != 0:
self._tcp_messenger = TCPMessenger(tcp_port, self._io_executor, loop=self._loop)
if broadcast_port != 0:
self._udp_messenger = UDPMessenger(broadcast_address, broadcast_port, self._io_executor, True, self._loop)
self._listeners = {
'tcp': self._tcp_messenger,
'udp': self._udp_messenger,
}
for messenger in self._listeners.values():
messenger.set_on_message(self._on_message)
self._daemon = None
self._message_queue = asyncio.Queue()
def start(self):
self._logger.info('Starting messengers...')
for messenger in self._listeners.values():
messenger.start()
self._logger.info('Messengers started!')
self._daemon = wrap_exc(asyncio.async(self._taking_messages_loop()), self._logger)
def stop(self):
if self._daemon is not None:
self._daemon.cancel()
self._daemon = None
self._tcp_messenger.stop()
self._udp_messenger.stop()
self._io_executor.shutdown(wait=False)
def _serialize(self, message: Message):
self._logger.debug('Serialized message: {}...'.format(message.__getstate__()))
return serialize_message(message, ENCODING)
@asyncio.coroutine
def _on_message(self, message: Message, address):
node_id = message.author_node_id
if node_id in self._lost_nodes:
self._lost_nodes.remove(node_id)
self._logger.info('Heard about lost node again! (node_id={}) (so lost nodes: {})'
.format(node_id, self._lost_nodes))
if node_id not in self.nodes:
host = address[0]
self._add_node(node_id, host)
wrap_exc(asyncio.async(self.send_message(node_id, Message(MessageType.PING, self.node_id))), self._logger)
elif address[0] != self.nodes[node_id]:
self._logger.error('Unexpected state! My nodes: {}. {} != {} (node_id={})'
.format(self.nodes, address[0], self.nodes[node_id], node_id))
if message.type == MessageType.TAKE_TOKEN:
assert isinstance(message, TakeTokenMessage)
for node_id, host in message.nodes.items():
if node_id not in self.nodes:
self._add_node(node_id, host)
else:
if host != self.nodes[node_id]:
self._logger.error('Unexpected state! My nodes: {}. Nodes in message: {}. {} != {} (node_id={})'
.format(self.nodes, message.nodes, host, self.nodes[node_id], node_id))
def _add_node(self, node_id, host):
for old_node_id, old_host in self.nodes.items():
if old_host == host:
self._logger.error('IP collision! (new node id={}, new host={}, old node id={}, old ip={})'
.format(node_id, host, old_node_id, old_host))
self.nodes[node_id] = host
self._logger.info('New node: {} at {}! (total number: {})'.format(node_id, host, len(self.nodes)))
def format_node_id(node_id):
return '{}{}'.format(node_id, '' if self.node_id != node_id else ' (me)')
self._logger.info('Nodes order: {}'.format([(format_node_id(node_id), self.nodes[node_id]) for node_id in sorted(self.nodes.keys())]))
@asyncio.coroutine
def _taking_messages_loop(self):
while True:
takings = []
for listener in self._listeners.values():
takings.append(wrap_exc(asyncio.async(listener.take_message()), self._logger))
with auto_cancellation(takings):
done, pending = yield from asyncio.wait(takings, return_when=concurrent.futures.FIRST_COMPLETED)
for f in done:
message = yield from f
self._message_queue.put_nowait(message)
self._logger.debug(
'Message {} putted. Queue size: {}.'.format(message.type, self._message_queue.qsize()))
@asyncio.coroutine
def take_message(self):
message = yield from self._message_queue.get()
self._logger.debug('Taking message: {}...'.format(message.type))
return message
@asyncio.coroutine
def send_broadcast(self, message):
message_bytes = self._serialize(message)
yield from self._udp_messenger.send_message(message_bytes)
@asyncio.coroutine
def send_message(self, node_id, message):
if node_id in self._lost_nodes:
self._logger.error('Sending message to node, that seems to be lost! (node id={}, message type={})'
.format(node_id, message.type))
self._logger.debug('Sending "{}" message to node {}...'.format(message.type, node_id))
host = self.nodes[node_id]
success = yield from self._tcp_messenger.send_message(host, self._serialize(message))
if not success:
self._lost_nodes.add(node_id)
self._logger.warn('Node seems to be lost! (node_id={})'.format(node_id))
if self.node_id == node_id:
self._logger.error('We can not connect with our-self?! ')
return success
def get_next_available_node_id(self):
nodes = sorted(self.nodes.keys())
next_index = (nodes.index(self.node_id) + 1)
for candidate_id in nodes[next_index:] + nodes[:next_index]:
if candidate_id not in self._lost_nodes:
return candidate_id
@property
def node_id(self):
return str(self._node_id or self._mac)
@property
def nodes(self):
return self._nodes
class Messenger:
def __init__(self,
mac,
broadcast_address,
broadcast_port,
tcp_port,
node_id=None,
loop=None):
self._mac = mac
self._node_id = node_id
self._nodes = {}
self._lost_nodes = set()
self._loop = loop or asyncio.get_event_loop()
self._io_executor = AsyncExecutor(5, self._loop)
self._logger = logging.getLogger('Messenger')
self._logger.info('Creating messengers...')
if tcp_port != 0:
self._tcp_messenger = TCPMessenger(tcp_port,
self._io_executor,
loop=self._loop)
if broadcast_port != 0:
self._udp_messenger = UDPMessenger(broadcast_address,
broadcast_port,
self._io_executor, True,
self._loop)
self._listeners = {
'tcp': self._tcp_messenger,
'udp': self._udp_messenger,
}
for messenger in self._listeners.values():
messenger.set_on_message(self._on_message)
self._daemon = None
self._message_queue = asyncio.Queue()
def start(self):
self._logger.info('Starting messengers...')
for messenger in self._listeners.values():
messenger.start()
self._logger.info('Messengers started!')
self._daemon = wrap_exc(asyncio. async (self._taking_messages_loop()),
self._logger)
def stop(self):
if self._daemon is not None:
self._daemon.cancel()
self._daemon = None
self._tcp_messenger.stop()
self._udp_messenger.stop()
self._io_executor.shutdown(wait=False)
def _serialize(self, message: Message):
self._logger.debug('Serialized message: {}...'.format(
message.__getstate__()))
return serialize_message(message, ENCODING)
@asyncio.coroutine
def _on_message(self, message: Message, address):
node_id = message.author_node_id
if node_id in self._lost_nodes:
self._lost_nodes.remove(node_id)
self._logger.info(
'Heard about lost node again! (node_id={}) (so lost nodes: {})'
.format(node_id, self._lost_nodes))
if node_id not in self.nodes:
host = address[0]
self._add_node(node_id, host)
wrap_exc(
asyncio. async (self.send_message(
node_id, Message(MessageType.PING, self.node_id))),
self._logger)
elif address[0] != self.nodes[node_id]:
self._logger.error(
'Unexpected state! My nodes: {}. {} != {} (node_id={})'.format(
self.nodes, address[0], self.nodes[node_id], node_id))
if message.type == MessageType.TAKE_TOKEN:
assert isinstance(message, TakeTokenMessage)
for node_id, host in message.nodes.items():
if node_id not in self.nodes:
self._add_node(node_id, host)
else:
if host != self.nodes[node_id]:
self._logger.error(
'Unexpected state! My nodes: {}. Nodes in message: {}. {} != {} (node_id={})'
.format(self.nodes, message.nodes, host,
self.nodes[node_id], node_id))
def _add_node(self, node_id, host):
for old_node_id, old_host in self.nodes.items():
if old_host == host:
self._logger.error(
'IP collision! (new node id={}, new host={}, old node id={}, old ip={})'
.format(node_id, host, old_node_id, old_host))
self.nodes[node_id] = host
self._logger.info('New node: {} at {}! (total number: {})'.format(
node_id, host, len(self.nodes)))
def format_node_id(node_id):
return '{}{}'.format(node_id,
'' if self.node_id != node_id else ' (me)')
self._logger.info('Nodes order: {}'.format([
(format_node_id(node_id), self.nodes[node_id])
for node_id in sorted(self.nodes.keys())
]))
@asyncio.coroutine
def _taking_messages_loop(self):
while True:
takings = []
for listener in self._listeners.values():
takings.append(
wrap_exc(asyncio. async (listener.take_message()),
self._logger))
with auto_cancellation(takings):
done, pending = yield from asyncio.wait(
takings, return_when=concurrent.futures.FIRST_COMPLETED)
for f in done:
message = yield from f
self._message_queue.put_nowait(message)
self._logger.debug(
'Message {} putted. Queue size: {}.'.format(
message.type, self._message_queue.qsize()))
@asyncio.coroutine
def take_message(self):
message = yield from self._message_queue.get()
self._logger.debug('Taking message: {}...'.format(message.type))
return message
@asyncio.coroutine
def send_broadcast(self, message):
message_bytes = self._serialize(message)
yield from self._udp_messenger.send_message(message_bytes)
@asyncio.coroutine
def send_message(self, node_id, message):
if node_id in self._lost_nodes:
self._logger.error(
'Sending message to node, that seems to be lost! (node id={}, message type={})'
.format(node_id, message.type))
self._logger.debug('Sending "{}" message to node {}...'.format(
message.type, node_id))
host = self.nodes[node_id]
success = yield from self._tcp_messenger.send_message(
host, self._serialize(message))
if not success:
self._lost_nodes.add(node_id)
self._logger.warn(
'Node seems to be lost! (node_id={})'.format(node_id))
if self.node_id == node_id:
self._logger.error('We can not connect with our-self?! ')
return success
def get_next_available_node_id(self):
nodes = sorted(self.nodes.keys())
next_index = (nodes.index(self.node_id) + 1)
for candidate_id in nodes[next_index:] + nodes[:next_index]:
if candidate_id not in self._lost_nodes:
return candidate_id
@property
def node_id(self):
return str(self._node_id or self._mac)
@property
def nodes(self):
return self._nodes
