Auth token is not automatically refreshed, long-living client connections are unauthenticated after TTL expires

[whilenot-dev]

My goal was to have a single, long-lived etcd client for a web service.

According to etcd issues it would be up to client SDKs to implement auth token renewal on long-lived connections. aetcd currently doesn't do a token refresh and I got to experience that the hard way.

To reproduce:

1. configure your etcd cluster with a short auth-ttl
2. create and connect a client with aetcd
3. await TTL (calls made before the TTL expires will extend the TTL!)
4. make another call with the same client and the same connection -> aetcd.exceptions.UnauthenticatedError: etcdserver: invalid auth token

key = '/foo'.encode()
ttl = 60

etcd = aetcd.Client()
await etcd.connect()
value = await etcd.get(key)  # ok
await asyncio.sleep(ttl + 1)
value = await etcd.get(key)  # error

As a workaround just use short-lived client connections wherever possible, á la:

async with aetcd.Client() as etcd:
    # do stuff

I currently don't know if watchers are affected.

[martyanov]

@whilenot-dev Many thanks for reporting the issue!

I'm currently out of business, IT industry in its current shape is a mess I have no desire to deal with.

Since I left the company that was using the driver its future is undefined.

I'm sorry about that!

[whilenot-dev]

Thanks for the quick reply @martyanov, nothing to be sorry about!

Seems like I'll have a future PR to contribute then =)