我正在尝试使用
在下面的脚本中,我将
下表表示每个请求后的
此外,为什么
输出结果已经粘贴在 https://pastebin.com/rvfzMTe3。我将它放在那里,而不是在这里,因为这些行很长且无法很好地换行。
aiohttp.connector.TCPConnector
的limit
和limit_per_host
参数进行实验。在下面的脚本中,我将
connector = aiohttp.connector.TCPConnector(limit=25, limit_per_host=5)
传递给aiohttp.ClientSession
,然后打开2个请求到docs.aiohttp.org和3个请求到github.com。
session.request
的结果是aiohttp.ClientResponse
的一个实例,在这个例子中,我有意不通过.close()
或__aexit__
调用它。我认为这会保持连接池打开,并将可用连接减少到该(host, ssl, port)三元组-1。下表表示每个请求后的
._available_connections()
。为什么即使完成了对docs.aiohttp.org的第二个请求,数字仍停留在4?这两个连接都可能仍然打开,并且还没有访问._content
或关闭。可用连接难道不应该减少1吗?After Request Num. To _available_connections
1 docs.aiohttp.org 4
2 docs.aiohttp.org 4 <--- Why?
3 github.com 4
4 github.com 3
5 github.com 2
此外,为什么
._acquired_per_host
只包含一个键?我猜可能是我对TCPConnector
的方法理解有误,这解释了上面的行为。import aiohttp
async def main():
connector = aiohttp.connector.TCPConnector(limit=25, limit_per_host=5)
print("Connector arguments:")
print("_limit:", connector._limit)
print("_limit_per_host:", connector._limit_per_host)
print("-" * 70, end="\n\n")
async with aiohttp.client.ClientSession(
connector=connector,
headers={"User-Agent": "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2225.0 Safari/537.36"},
raise_for_status=True
) as session:
# Make 2 connections to docs.aiohttp.org and
# 3 connections to github.com
#
# Note that these instances intentionally do not use
# .close(), either explicitly or via __aexit__
# in an async with block
r1 = await session.request(
"GET",
"https://docs.aiohttp.org/en/stable/client_reference.html#connectors"
)
print_connector_attrs("r1", session)
r2 = await session.request(
"GET",
"https://docs.aiohttp.org/en/stable/index.html"
)
print_connector_attrs("r2", session)
r3 = await session.request(
"GET",
"https://github.com/aio-libs/aiohttp/blob/master/aiohttp/client.py"
)
print_connector_attrs("r3", session)
r4 = await session.request(
"GET",
"https://github.com/python/cpython/blob/3.7/Lib/typing.py"
)
print_connector_attrs("r4", session)
r5 = await session.request(
"GET",
"https://github.com/aio-libs/aiohttp"
)
print_connector_attrs("r5", session)
def print_connector_attrs(name: str, session: aiohttp.client.ClientSession):
print("Connection attributes for", name, end="\n\n")
conn = session._connector
print("_conns:", conn._conns, end="\n\n")
print("_acquired:", conn._acquired, end="\n\n")
print("_acquired_per_host:", conn._acquired_per_host, end="\n\n")
print("_available_connections:")
for k in conn._acquired_per_host:
print("\t", k, conn._available_connections(k))
print("-" * 70, end="\n\n")
if __name__ == "__main__":
import asyncio
loop = asyncio.get_event_loop()
loop.run_until_complete(main())
输出结果已经粘贴在 https://pastebin.com/rvfzMTe3。我将它放在那里,而不是在这里,因为这些行很长且无法很好地换行。