how can i retrieve MDC from a CoroutineContext in a exceptio kotlinlang #coroutines

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Title

Nikky

11/12/2020, 4:25 PM

how can i retrieve MDC from a CoroutineContext in a exception handler ? the code looks like so currently

private val exceptionHandler = CoroutineExceptionHandler { context, e -> GlobalScope.launch(MDCContext() + context) {

can i somehow do

context.getCopyOfContextMap()

louiscad

11/12/2020, 5:10 PM

It's unclear what MDC is, but docs about CoroutineContext online explain how to put custom stuff in it and how to get it back.

gildor

11/13/2020, 6:33 AM

MDC is Mapped Diagnostic Context, integration with sl4j logging

how can i retrieve MDC from a CoroutineContext in a exception handler

Maybe I misunderstood your case, but why not just

CoroutineExceptionHandler { context, e ->
val mdcMap = 
context[MDCContext]?.contextMap
}

Nikky

11/13/2020, 12:00 PM

i arrived at this.. and i hope it ends up working..

MDCContext(context[MDCContext.Key]?.contextMap)

gildor

11/13/2020, 1:01 PM

So your goal is copy it? Why not just use directly?

Nikky

11/13/2020, 3:13 PM

the goal is to only extract the MDCContext out of the

context

variable so that the logged error will have the mdc context from where the exception comes.. hopefully

muliyul

11/18/2020, 4:46 PM

https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-slf4j/kotlinx.coroutines.slf4j/-m-d-c-context/

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