8056dc33e3
The underlying l4g library is not resilient to filter modifications in the presence of concurrent goroutines. In particular, it's not safe to call Close() on filters which might be actively held by a goroutine for logging. This change disables all modifications to existing filters once initialized by the App layer. In practice, we might be able to get away with some modifications to the existing filters (i.e. changing levels), but the [golang memory model](https://golang.org/ref/mem) makes no guarantees that it is safe to do so: > Programs that modify data being simultaneously accessed by multiple goroutines must serialize such access. We can solve this holistically by introducing the requisite locking within our fork of the l4g library. For now, we just disable all modifications.
Mattermost is an open source, private cloud, Slack-alternative from https://mattermost.org.
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