346fab1620
This ticket does a number of improvements to the email batching code in general. - Fix unbounded goroutines: We now send mails using a single goroutine only. Since anyways the processing is asynchronous, performance should not matter. - Move the exit condition earlier: We have moved up the check for the per-user email interval preference. This prevents unnecessary DB calls from happening. - Break from the loop properly: The objective was to not send notifications if a user has viewed any channel since a notification was queued. But there were 2 nested for loops and we were breaking from just one and not the other. That is correctly fixed now to prevent unnecessary DB calls. - Gracefully shutdown the job: The batching task wasn't properly shut down and could have notifications in-flight which would have not got sent. We fix that now by cancelling the task and waiting for it to finish. https://mattermost.atlassian.net/browse/MM-50393
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