asyncpg没有类似于psycopg2中的keepalive选项,但是可以使用新的TCP keep-alive机制来达到相同的效果。可以使用Python的socket模块来设置TCP keep-alive套接字选项,并将asyncpg的连接传递给此选项。以下是示例代码:
import socket
import asyncpg
async def connect_to_database():
conn = await asyncpg.connect(
user="user",
password="password",
database="database",
host="localhost",
port=5432,
)
# Get underlying socket of asyncpg connection.
sock = conn._transport.get_extra_info('socket')
if sock is not None:
# Enable TCP keep-alive with a 10 second timeout.
sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 10)
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 5)
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 3)
return conn
该方法使用asyncpg.connect()
连接到数据库,然后使用conn._transport.get_extra_info('socket')
获取基础套接字。通过调用sock.setsockopt()
来设置所需的TCP keep-alive选项。在上面的示例中,我们使用了一个10秒的TCP keep-alive超时,每5秒检查一次,最多尝试3次连接。这个值可以根据客户机TCP keep-alive策略的要求进行更改。