awssub: remove message from queue in non concurrent way #88
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After a message is handled by a client, the message is being removed via
subscriberMessage.Done()method. The method sends to a channel a request to remove the message from a queue and that request will be handled by another goroutine in some indefinite time. The channel in our case is not buffered which blocks all callers of Done method till the previous request is handled.This in high load slows down the message handling a lot in a case if the messages are being handled concurrently.
In this PR I suggest to simplify the current solution, and instead of queuing up a request to remove a message, remove it synchronously by sending a request to sqs.
The current changes is backward compatible.