Add mcs admin trace api

[cesnietor]

Trace Api uses websocket to send trace information, a
valid jwt token needs to be sent either on the header
or as a cookie of the ws request to start.
Three goroutines are needed to ensure communication
if read hearbeat fails all trace should stop by cancelling
the context. WaitGroups are needed to ensure all
goroutines finish gracefully.

Note: To test this a websocket client is needed.
-You can test it by doing /ws/trace
-PingWait is 15 sec.

[Alevsk]

reviewing 👀
.......
review completed 👍

[bexsoft]

Please update your branch with the latest from master

[cesnietor]

Please update your branch with the latest from master

done

[Alevsk]

I read the PR description regarding 3 goroutines but I don't have all the context, is this need it for some type of quorum? would someone want to increase this to 5 or 7 in the future? If the answer is yes an env variable should be added for user to configure this value.

[cesnietor]

I'll explain:

• The goroutines are fixed for this (trace) functionality. A goroutine [1] for listen on client heartbeat is needed. Second goroutine is needed for Writing to the socket (send the trace info), and a Third one is needed for checking if it crashed on reading (on [1]), for instance, the client disconnected or the ping Deadline happend.

[dvaldivia]

I think you could instead wait on their respective channels to close up instead of a wait group to ensure there's no deadlock due to a go routine never calling wg.Done, since each goroutine already returns a channel, I think essentially you aonly need sendTraceInfo routine to close to mark the process as finished, and you could signal the other 2 routines to close via context, elimitating the need for a wait group

[cesnietor]

@dvaldivia No, because I need any of (wsReadCheck or sendTraceInfo) to trigger a cancel context, not just sendTraceInfo. If ReadCheck fails that should cancel sendTraceInfo and viceversa. Else either the Read or the Trace would remain open. There is no deadlock since all return if context is cancelled.

[bexsoft]

LGTM