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2427bda737
This commit introduces a new boolean flag, `shutdown`, to the
forward_service, along with a corresponding shutdown method. It also
adds checks throughout the forward_service to verify the value of the
shutdown flag before retrying or invoking functions that might use the
messaging service under the hood.
The flag is set before messaging service shutdown, by invoking
forward_service::shutdown in main. By checking the flag before each call
that potentially involves the messaging service, we can ensure that the
messaging service is still operational. If the flag is false, indicating
that the messaging service is still active, we can proceed with the
call. In the event that the messaging service is shutdown during the
call, appropriate exceptions should be thrown somewhere down in called
functions, avoiding potential hangs.
This fix should resolve the issue where forward_service retries could
block the shutdown.
Fixes #12604
Closes #13922
(cherry picked from commit e0855b1de2)