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Simple threaded cassandra wrapper for asyncio

Project description

info:Simple threaded cassandra wrapper for asyncio


pip install aiocassandra


import asyncio

from aiocassandra import aiosession
from cassandra.cluster import Cluster
from cassandra.query import SimpleStatement

# connection is blocking call
cluster = Cluster()
# aiocassandra uses executor_threads to talk to cassndra driver
session = cluster.connect()

async def main():
    # patches and adds `execute_future`, `execute_futures` and `prepare_future`
    # to `cassandra.cluster.Session`

    # best way is to use cassandra prepared statements
    # try to create them once on application init
    query = session.prepare('SELECT now() FROM system.local;')

    # if non-blocking prepared statements is really needed:
    query = await session.prepare_future('SELECT now() FROM system.local;')

    print(await session.execute_future(query))

    # pagination is also supported
    query = 'SELECT * FROM system.size_estimates;'
    statement = SimpleStatement(query, fetch_size=100)

    # don't miss *s* (execute_futureS)
    async with session.execute_futures(statement) as paginator:
        async for row in paginator:

loop = asyncio.get_event_loop()

Python 3.5+ is required


The library was donated by Ocean S.A.

Thanks to the company for contribution.

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