ServicerContext.is_active() returning True after client's disconnection

[cscarpitta]

What version of gRPC and what language are you using?

grpcio==1.23.0
python

What operating system (Linux, Windows,...) and version?

Linux Xubuntu with kernel 5.2.0

What runtime / compiler are you using (e.g. python version or version of gcc)

python 2.7

What did you do?

I'm trying to use the stream gRPCs in my python application.
A client subscribes to a stream of updates once and receives all changes to the server state until the client disconnects (forcefully or gracefully).

What did you expect to see?

If the client disconnects forcefully I expect that ServicerContext.is_active() whould return False, so that I can check it and stop sending updates to the client.

What did you see instead?

ServicerContext.is_active() continues to return True when the client disconnects from the server.

Anything else we should know about your project / environment?

The bug has been already signaled in the past years
https://stackoverflow.com/questions/43948975/grpc-unary-streaming-continues-after-disconnect-blocks-on-interrupt

#11157

https://groups.google.com/forum/#!topic/grpc-io/45LxvLyYVLk

Is it possible to fix it?

[cscarpitta]

The problem just happens on python 2.7

I tried on python 3.7 and it works correctly.
After quitting the client, the ServicerContext.is_active() invoked on the server returns False as expected

[karthikravis]

@gnossen : can you please take a look?

[stale]

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