def connect(self):
if self._lookupd_http_addresses:
self._lookupd_task = asyncio.Task(self._lookupd(), loop=self._loop)
if self._nsqd_tcp_addresses:
for host, port in self._nsqd_tcp_addresses:
conn = yield from create_nsq(host, port, queue=self._queue,
loop=self._loop)
self._connections[conn.id] = conn
self._rdy_control = RdyControl(idle_timeout=self._idle_timeout,
max_in_flight=self._max_in_flight,
loop=self._loop)
self._rdy_control.add_connections(self._connections)
class NsqConsumer:
"""Experiment purposes"""
def __init__(self, nsqd_tcp_addresses=None, lookupd_http_addresses=None,
max_in_flight=42, loop=None):
self._nsqd_tcp_addresses = nsqd_tcp_addresses or []
self._lookupd_http_addresses = lookupd_http_addresses or []
self._max_in_flight = max_in_flight
self._loop = loop or asyncio.get_event_loop()
self._queue = asyncio.Queue(loop=self._loop)
self._connections = {}
self._idle_timeout = 10
self._rdy_control = None
self._max_in_flight = max_in_flight
self._is_subscribe = False
self._redistribute_timeout = 5 # sec
self._lookupd_poll_time = 30 # sec
@asyncio.coroutine
def connect(self):
if self._lookupd_http_addresses:
self._lookupd_task = asyncio.Task(self._lookupd(), loop=self._loop)
if self._nsqd_tcp_addresses:
for host, port in self._nsqd_tcp_addresses:
conn = yield from create_nsq(host, port, queue=self._queue,
loop=self._loop)
self._connections[conn.id] = conn
self._rdy_control = RdyControl(idle_timeout=self._idle_timeout,
max_in_flight=self._max_in_flight,
loop=self._loop)
self._rdy_control.add_connections(self._connections)
@asyncio.coroutine
def _poll_lookupd(self, host, port):
conn = NsqLookupd(host, port, loop=self.loop)
res = yield from conn.lookup('foo')
for producer in res['producers']:
host = producer['broadcast_address']
port = producer['tcp_port']
conn = yield from create_nsq(host, port, queue=self._queue,
loop=self._loop)
self._connections[conn.id] = conn
conn.close()
@asyncio.coroutine
def subscribe(self, topic, channel):
self._is_subscribe = True
for conn in self._connections.values():
yield from conn.sub(topic, channel)
self._redistribute_task = asyncio.Task(self._redistribute(),
loop=self._loop)
def wait_messages(self):
if not self._is_subscribe:
raise ValueError('You must subscribe to the topic first')
while self._is_subscribe:
fut = asyncio.async(self._queue.get(), loop=self._loop)
yield fut
def is_starved(self):
conns = self._connections.values()
return any(conn.is_starved() for conn in conns)
@asyncio.coroutine
def _redistribute(self):
while self._is_subscribe:
self._rdy_control.redistribute()
yield from asyncio.sleep(self._redistribute_timeout,
loop=self._loop)
@asyncio.coroutine
def _lookupd(self):
while self._is_subscribe:
yield from asyncio.sleep(self._redistribute_timeout,
loop=self._loop)
host, port = random.choice(self._lookupd_http_addresses)
yield from self._poll_lookupd(host, port)
