Memory leak in bidi resources

[daniel-sanche]

Reported in python-firestore: googleapis/python-firestore#985

It looks like some of the resources in BackgroundConsumer and ResumableBidiRpc are not being cleaned up properly on close, and preventing garbage collection. I ran the attached script, and can confirm I see the same thing

I opened #770 to address the issue, but maybe someone with more familiarity with the classes can take a look as well

[vchudnov-g]

Thanks for reporting this and proposing a fix, @daniel-sanche! The "attached script" you refer to is the "Code example" in googleapis/python-firestore#985, correct?

[daniel-sanche]

Yes, that's the one