nil pointer panic when closing producer #50
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This PR fixes #49. The issue is that we were closing the stop channel and the underlying producer at the same time. Since the select in
run()is non-deterministic and the channels of the producer (errors and successes) may return nil if they are closed, sometimes the goroutine was getting anilvalue back and trying to derefence the Metadata pointer.We now first close the stop channel, that will force the goroutine in
run()to exit. Afterwards, we close the underlying producer.