asyncio integration with ZeroMQ
asyncio (PEP 3156) support for ZeroMQ.
The difference between
aiozmq and vanilla
zmq.asyncio works only by replacement event loop with custom one.
This approach works but have two disadvantages:
zmq.asyncio.ZMQEventLoopcannot be combined with other loop implementations (most notable is ultra fast
It uses internal ZMQ Poller which has fast ZMQ Sockets support but doesn't intended to work fast with many (thousands) regular TCP sockets.
In practice it means that
zmq.asynciois not recommended to be used with web servers like
Simple high-level client-server RPC example:
import asyncio import aiozmq.rpc class ServerHandler(aiozmq.rpc.AttrHandler): @aiozmq.rpc.method def remote_func(self, a:int, b:int) -> int: return a + b @asyncio.coroutine def go(): server = yield from aiozmq.rpc.serve_rpc( ServerHandler(), bind='tcp://127.0.0.1:5555') client = yield from aiozmq.rpc.connect_rpc( connect='tcp://127.0.0.1:5555') ret = yield from client.call.remote_func(1, 2) assert 3 == ret server.close() client.close() asyncio.get_event_loop().run_until_complete(go())
Low-level request-reply example:
import asyncio import aiozmq import zmq @asyncio.coroutine def go(): router = yield from aiozmq.create_zmq_stream( zmq.ROUTER, bind='tcp://127.0.0.1:*') addr = list(router.transport.bindings()) dealer = yield from aiozmq.create_zmq_stream( zmq.DEALER, connect=addr) for i in range(10): msg = (b'data', b'ask', str(i).encode('utf-8')) dealer.write(msg) data = yield from router.read() router.write(data) answer = yield from dealer.read() print(answer) dealer.close() router.close() asyncio.get_event_loop().run_until_complete(go())
Comparison to pyzmq
zmq.asyncio provides a asyncio compatible loop implementation.
But it's based on zmq.Poller which doesn't work well with massive non-zmq sockets usage.
E.g. if you build a web server for handling at least thousands of parallel web requests (1000-5000) pyzmq internal Poller will be slow.
aiozmq works with epoll natively, it doesn't need custom loop implementation and cooperates pretty weel with uvloop for example.
For details see https://github.com/zeromq/pyzmq/issues/894
aiozmq is offered under the BSD license.