Created
August 14, 2013 18:09
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relay messages from NSQ to NSQ via TCP protocol
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import tornado.options | |
from nsq import Reader, run | |
from nsq import Writer, Error | |
import functools | |
import logging | |
from host_pool import HostPool | |
class NSQProxy: | |
def __init__(self, topic, nsqds): | |
self.topic = topic | |
self.writer_pool = HostPool([Writer([nsqd]) for nsqd in nsqds]) | |
def relay(self, nsq_message): | |
nsq_message.enable_async() | |
writer = self.writer_pool.get() | |
callback = functools.partial(self._on_message_response, nsq_message=nsq_message, writer=writer) | |
writer.pub(self.topic, nsq_message.body, callback) | |
def _on_message_response(self, conn, data, nsq_message, writer): | |
if isinstance(data, Error): | |
logging.warning("requeuing message: %s", nsq_message.body) | |
self.writer_pool.failed(writer) | |
nsq_message.requeue() | |
else: | |
self.writer_pool.success(writer) | |
nsq_message.finish() | |
if __name__ == "__main__": | |
tornado.options.define('destination_topic', type=str) | |
tornado.options.define('topic', type=str) | |
tornado.options.define('nsqd_tcp_address', type=str, multiple=True) | |
tornado.options.define('destination_nsqd_tcp_address', type=str, multiple=True) | |
tornado.options.define('lookupd_http_address', type=str, multiple=True) | |
tornado.options.define('channel', type=str) | |
tornado.options.define('max_in_flight', type=int, default=500) | |
tornado.options.parse_command_line() | |
assert tornado.options.options.topic | |
assert tornado.options.options.destination_nsqd_tcp_address | |
assert tornado.options.options.channel | |
destination_topic = str(tornado.options.options.destination_topic or tornado.options.options.topic) | |
lookupd_http_addresses = map(lambda addr: 'http://' + addr, tornado.options.options.lookupd_http_address) | |
proxy = NSQProxy(destination_topic, tornado.options.options.destination_nsqd_tcp_address) | |
Reader( | |
topic=tornado.options.options.topic, | |
channel=tornado.options.options.channel, | |
message_handler=proxy.relay, | |
max_in_flight=tornado.options.options.max_in_flight, | |
lookupd_http_addresses=lookupd_http_addresses, | |
nsqd_tcp_addresses=tornado.options.options.nsqd_tcp_address, | |
) | |
run() |
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