asyncnsq

async nsq with asyncio

if you dont like the pynsq(which use tornado) way to interact with nsq, then this library may be suitable for you

you can use this library as the common way to write things

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User Documents

Documents

Unsupported Features

different reader protocol support

for now only snappy support, if you want more, just start an feature issue.

Install

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pip install asyncnsq

Usage examples

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All you need is a loop, then enjoy. you can refer to examples, as well.

Consumer:

from asyncnsq import create_reader
from asyncnsq.utils import get_logger

loop = asyncio.get_event_loop()
async def go():
    try:
        reader = await create_reader(
            nsqd_tcp_addresses=['127.0.0.1:4150'],
            max_in_flight=200)
        await reader.subscribe('test_async_nsq', 'nsq')
        async for message in reader.messages():
            print(message.body)
            await message.fin()
    except Exception as tmp:
        self.logger.exception(tmp)
loop.run_until_complete(go())

Producer:

from asyncnsq import create_writer
loop = asyncio.get_event_loop()
async def go():
    writer = await create_writer(host='127.0.0.1', port=4150,
                                       heartbeat_interval=30000,
                                       feature_negotiation=True,
                                       tls_v1=True,
                                       snappy=False,
                                       deflate=False,
                                       deflate_level=0,
                                       loop=loop)
    for i in range(100):
        await writer.pub('test_async_nsq', 'test_async_nsq:{i}'.format(i=i))
        await writer.dpub('test_async_nsq', i * 1000,
                                'test_delay_async_nsq:{i}'.format(i=i))
loop.run_until_complete(go())

Requirements

• Python_ 3.6+ https://www.python.org

• nsq_ http://nsq.io

• python-snappy
  1. ubuntu:
     • sudo apt-get install libsnappy-dev
     • pip install python-snappy
  2. centos:
     • sudo yum install snappy-devel
     • pip install python-snappy
  3. mac:
     • brew install snappy # snappy library from Google
     • CPPFLAGS=”-I/usr/local/include -L/usr/local/lib” pip install python-snappy

Running Tests

1. install nsq requirements
   • install nsq https://nsq.io/deployment/installing.html
2. install requirements (in a virtual environment)
   • pip install aiohttp python-snappy
   • pip install pytest dev test package if you want autotest support
3. run the auth server in a separate terminal session
   • python -m aiohttp.web -H localhost -P 8080 asyncnsq.http.auth:create_dev_auth_server
4. run nsq in separate terminal sessions
   • if you’ve built nsq through make, cd into the build directory of nsq
   • ./nsqlookupd
   • ./nsqd --lookupd-tcp-address=localhost:4160 -auth-http-address=localhost:8080
5. run tests
   • python runtests.py

   example output:

    $ python runtests.py test_reader_and_writer
    decorator test_01_writer (tests.test_reader_and_writer.NsqTest) <_UnixSelectorEventLoop running=False closed=False debug=False> () {}
    .decorator test_02_reader (tests.test_reader_and_writer.NsqTest) <_UnixSelectorEventLoop running=False closed=False debug=False> () {}
    .
    ----------------------------------------------------------------------
    Ran 2 tests in 0.260s
   
    OK
   

   • pytest just pytest will do all the trick

    $ pytest -k test_reader_and_writer
    ------------------------------------------------------------------------------ live log call    -------------------------------------------------------------------------------
    DEBUG    asyncnsq.tcp:connection.py:82 execute command b'IDENTIFY\n\x00\x00\x00\x1d {"feature_negotiation": true}'
    DEBUG    asyncnsq.tcp:connection.py:239 got nsq data: (0, b'{"max_rdy_count":2500,"version":"1.2.0",    "max_msg_timeout":900000,"msg_timeout":60000,"tls_v1":false,"deflate":false,"deflate_level":6,  "max_deflate_level":6,"snappy":false,"sample_rate":0,"auth_required":false,"output_buffer_size":16384,    "output_buffer_timeout":250}')
    DEBUG    asyncnsq.tcp:connection.py:208 Task is canceled
    SKIPPED (no auth    enabled)                                                                                                                                              [ 75%]
    tests/test_reader_and_writer.py::NsqTest::test_04_reader_fail_missing_secret
    ------------------------------------------------------------------------------ live log call    -------------------------------------------------------------------------------
    DEBUG    asyncnsq.tcp:connection.py:82 execute command b'IDENTIFY\n\x00\x00\x00\x1d {"feature_negotiation": true}'
    DEBUG    asyncnsq.tcp:connection.py:239 got nsq data: (0, b'{"max_rdy_count":2500,"version":"1.2.0",    "max_msg_timeout":900000,"msg_timeout":60000,"tls_v1":false,"deflate":false,"deflate_level":6,  "max_deflate_level":6,"snappy":false,"sample_rate":0,"auth_required":false,"output_buffer_size":16384,    "output_buffer_timeout":250}')
    DEBUG    asyncnsq.tcp:connection.py:208 Task is canceled
    SKIPPED (no auth    enabled)                                                                                                                                              [100%]
   
    =============================================================== 2 passed, 2 skipped, 39 deselected in 0.    65s ================================================================
   
   

License

The asyncnsq is offered under MIT license.

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