[Issue 1218][Reader] Reader Next returns on closed consumer #1219
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Fixes #1218
Motivation
Calling Next on a reader already closed will block forever unless the context is canceled. Similarly, the call will not return if a different go routine closes the reader.
Modifications
Next now listens for the close channel of the consumer to return an error when it closes.
Verifying this change
This change added tests and can be verified as follows:
Does this pull request potentially affect one of the following parts:
None