Comments (6)
Hello, I would like to ask to reopen this issue, as it seems to manifest e.g. in microsoftgraph/msgraph-sdk-python#505 , preventing long living instances of msgraph.GraphServiceClient
from refreshing access tokens using an async Credential once they expire after an hour.
My suggestion would be to leave closing the credential entirely up to the user. For them it would then be easy to control the lifecycle of their credential instance by using it as context manager.
Closing the credential inside the library means that there is no way for the user to keep client instances alive for longer than one token lifetime, or to reuse the same credential to instantiate multiple clients.
At least in the case of using azure.identity.aio
credentials, it also makes the application crash with a very obscure exception (AttributeError: 'NoneType' object has no attribute '__aenter__'
) caused by the credential not expecting to be accessed after getting closed, which can not easily be caught and handled in user code. However, handling this status more robustly would need to be a change in that library instead of here, just adding it for context.
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@samwelkanda can you follow up on this one when you have some time please?
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@baywet is this closed?
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sure, it might be a problem in some scenarios (singleton instances of credentials etc...) but we'll wait for customers to report something before spending mort time on this first.
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Hi @baywet, hope you are well,
I have the same issue with GraphServiceClient
and would like to know how I should be using it.
I am currently using it as a singleton and after the token expires then I get the following error:
venv/lib/python3.11/site-packages/azure/core/pipeline/transport/_aiohttp.py", line 255, in send
result = await self.session.request( # type: ignore
^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'request'
What other approach should I be using if this is not correct?
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@Christiaan-Mathu My current workaround is to prevent the credential from getting closed by the GraphServiceClient using a custom credential implementation.
I basically derive a custom class from the async credential class I want to use (here azure.identity.aio.DefaultAzureCredential
) and override its async def close(self)
method to do nothing.
Instead I add another custom method to the derived credential class, which calls the original super-class close method, so that I can still actually close the underlying credential from my own application code at the right time, just before terminating.
This seems to work fine, I had no issues with this approach so far.
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