underlying scrapli connection is not open. error

[nielsvanhooy]

Hi there. i was working again on a side project i started a while back. But im running into a problem (of what im sure used to work before).

Before, i could make a connection to a device and pass it on to scrapli-cfg. but now it seems only to be working when i pass the option dedicated_connection. (i was hoping to get it to work without starting another connection).

The testcode setup.

async def test():
    device = {
        "host": "10.1.1.156",
        "auth_username": "lagen008",
        "auth_password": "lagen008",
        "auth_strict_key": False,
        "transport": "asyncssh",
        "ssh_config_file": "/Users/nielsvanhooij/git/new_bifrost_repos/phantom_communicator/phantom_communicator/config",
    }
    conn = AsyncIOSXEDriver(**device)
    cfg_conn = AsyncScrapliCfgIOSXE(conn=conn, dedicated_connection=True)
    await cfg_conn.prepare()
    version_result = await cfg_conn.get_version()
    print(version_result.result)

##### the above code works (but needs dedicated_connection=True).


    session = AsyncIOSXEDriver(**device)
    await session.open()
    cfg_conn = AsyncScrapliCfgIOSXE(conn=session)
    await cfg_conn.prepare()
    version_result = await cfg_conn.get_version()
    print(version_result.result)


### Above code doenst work and results in error (see below). but im very sure this used to work a while back.

asyncio.run(test())

Error below

    await cfg_conn.prepare()
  File "/Users/nielsvanhooij/Library/Caches/pypoetry/virtualenvs/phantom-communicator-EZUl1H7x-py3.12/lib/python3.12/site-packages/scrapli_cfg/platform/base/async_platform.py", line 158, in prepare
    await self._open()
  File "/Users/nielsvanhooij/Library/Caches/pypoetry/virtualenvs/phantom-communicator-EZUl1H7x-py3.12/lib/python3.12/site-packages/scrapli_cfg/platform/base/async_platform.py", line 119, in _open
    raise ScrapliCfgException(
scrapli_cfg.exceptions.ScrapliCfgException: underlying scrapli connection is not open and `dedicated_connection` is False, cannot continue!

please let me know your thoughts on this.

kind regards.
Niels

[carlmontanari]

what does session.conn.isalive() return? thats all it checks for. if thats foobar that is probably upstream scrapli issue. does a sync transport work?

[nielsvanhooy]

Hi there. so it seems that both variant in async give conn.isalive() is False.
in the sync variants it works. and shows nicely conn.isalive() is True

def test_sync():
    device = {
        "host": "10.1.1.156",
        "auth_username": "lagen008",
        "auth_password": "lagen008",
        "auth_strict_key": False,
        "ssh_config_file": "/Users/nielsvanhooij/git/new_bifrost_repos/phantom_communicator/phantom_communicator/config",
    }

    conn = IOSXEDriver(**device)
    cfg_conn = ScrapliCfgIOSXE(conn=conn)
    conn.open()
    alive = conn.isalive(). <--------------------------- True (no dedicated connection needed)
    cfg_conn.prepare()
    version_result = cfg_conn.get_version()
    print(version_result.result)

test_sync()

the async variant:

async def test():
    device = {
        "host": "10.1.1.156",
        "auth_username": "lagen008",
        "auth_password": "lagen008",
        "auth_strict_key": False,
        "transport": "asyncssh",
        "ssh_config_file": "/Users/nielsvanhooij/git/new_bifrost_repos/phantom_communicator/phantom_communicator/config",
    }
    conn = AsyncIOSXEDriver(**device)
    cfg_conn = AsyncScrapliCfgIOSXE(conn=conn, dedicated_connection=True)
    await conn.open()
    alive = conn.isalive(). <---------------------------------- gives False
    await cfg_conn.prepare()
    version_result = await cfg_conn.get_version()
    print(version_result.result)

    session = AsyncIOSXEDriver(**device)
    await session.open()
    alive_two = session.isalive(). <---------------------------------- gives False
    cfg_conn = AsyncScrapliCfgIOSXE(conn=session)
    await cfg_conn.prepare()
    version_result = await cfg_conn.get_version()
    print(version_result.result)

asyncio.run(test())

[carlmontanari]

copy, thanks for reporting back! will check this more hopefully this weekend. if you have time to look in upstream scrapli to see what's what that would be great too!

[carlmontanari]

hey again @nielsvanhooy

could ya drop some prints like this after you open an async connection?

    print(f"isalive?                       -> {conn.isalive()} ")
    print(f"conn session                   -> {conn.transport.session is not None}")
    print(f"conn auth                      -> {conn.transport.session._auth_complete}")
    print(f"conn session transport         -> {conn.transport.session._transport is not None}")
    print(f"conn session transport closing -> {conn.transport.session._transport.is_closing()}")

these are all the things that are evaluated for asyncssh transport "isalive" check -- this check seems to work ok for me so just wondering which of these is not happy for your device/platform. everything "should" say True minus the last one which should be False.