Fix sleepWithCancel and ensure closed channel - #448
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* time.NewTicker will panic if the duration is 0. Make it return early if duration is 0. * Return a pre-closed channel in Wait() instead of nil. Ensures receiver will not block forever. Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>
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I need to create a common type for workers and de-duplicate some of the code, now that we have a clear pattern in how they are set up.