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It led to a neo-go dead-lock in the `subscriber` component. Subscribing to notifications is the same RPC as any others, so it could also be blocked forever if no async listening (reading the notification channel) routine exists. If a number of subscriptions is big enough (or a caller is lucky enough) subscribing loop might have not finished subscribing before the first notification is received and then: subscribing RPC is blocked by received notification (non)handling and listening notifications routine is blocked by not finished subscription loop. That commit starts listening notification channel _before_ any subscription actions. Signed-off-by: Pavel Karpy <p.karpy@yadro.com> |
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