aiossdb

aiossdb is a library for accessing a ssdb database from the asyncio

Requirements

• Python 3.5+

DONE and TODO

• base async ssdb connection
• async ssdb parser
• async ssdb connection pool
• easy using ssdb async client
• tests
• detailed docs
• suppress ReplyError as a choice
• releasing...
• and more...

Quick Start

• Client

Client会创建一个连接池，在每次执行命令的时候都会去从可用连接池中拿到连接，然后执行命令，然后释放

loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)


@asyncio.coroutine
def just_look():
    c = Client(loop=loop)
    yield from c.set('a', 1)
    res = yield from c.get('a')
    print(res)
    yield from c.close()
    return res

loop.run_until_complete(just_look())
loop.close()

• ConnectionPool

import asyncio
from aiossdb import create_pool

loop = asyncio.get_event_loop()


@asyncio.coroutine
def connect_tcp():
    pool = yield from create_pool(('localhost', 8888), loop=loop, minsize=5, maxsize=10)

    # 使用pool直接执行命令
    yield from pool.execute('set', 'a', 2)
    val = yield from pool.execute('hget', 'hash_name', 'hash_key')
    print(val)

    # 使用pool获取连接
    conn, addr = yield from pool.get_connection()
    yield from conn.execute('set', 'a', 2)
    val = yield from conn.execute('hget', 'hash_name', 'hash_key')
    print(val)
    # 获取的连接最后一定要release
    yield from pool.release(conn)

    pool.close()
    yield form pool.wait_closed()

loop.run_until_complete(connect_tcp())
loop.close()

如果获取不存在的键等情况会引发ReplyError, 错误类型可能有: not_found, error, fail, client_error

try:
    val = yield from conn.execute('hget', 'hash_name', 'hash_key')
except ReplyError as e:
    print("错误类型是: {}".format(e.etype))
    print("执行的命令是: {}".format(e.command))

• Connection

import asyncio
from aiossdb import create_connection, ReplyError


loop = asyncio.get_event_loop()


@asyncio.coroutine
def connect_tcp():
    conn = yield from create_connection(('localhost', 8888), loop=loop)
    yield from conn.execute('set', 'a', 2)
    val = yield from conn.execute('hget', 'hash_name', 'hash_key')
    print(val)

    conn.close()
    yield from conn.wait_closed()

loop.run_until_complete(connect_tcp())
loop.close()

Exceptions

• SSDBError
  • ConnectionClosedError
  • ReplyError
  • ProtocolError
  • PoolClosedError

NOTES

• The preliminary test shows that aiossdb is 25 times fast than pyssdb

Contributor

Kevin Du

• Email: dgt_x@foxmail.com
• Site: http://skyrover.me