7ce68e89d7
* MM-22044: Fix panic on web_conn send hello (*Hub).Start is the central place for sending all web connection related traffic. However, there was this one call to (*WebConn).Hello which tried to send a message to a webconn separately. This was a rare case, but it did occur under stress conditions generated from a load test. When the websocket send SEND_QUEUE_SIZE would get filled up and we would attempt to make a broadcast, the non-blocking send would close the Send channel of the web connection. During that time, if a web connection would try to perform a broadcast, it would try to send to a closed channel and cause a panic. The solution is to bring back the sending of hello into the same goroutine inside (*Hub).Start so that all state is centralised and we avoid sending to a closed channel by sending the hello message inside the registering code itself. * Adding non-blocking send * Simplify things * Remove test * Bring sendHello back * Improve code further Co-authored-by: mattermod <mattermod@users.noreply.github.com>
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