Finatra debug log per request

logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
   
    ...

    <turboFilter class="ch.qos.logback.classic.turbo.DynamicThresholdFilter">
        <Key>X-Log-Level</Key>
        <DefaultThreshold>INFO</DefaultThreshold>
        <OnHigherOrEqual>ACCEPT</OnHigherOrEqual>
        <OnLower>DENY</OnLower>
        <MDCValueLevelPair>
            <value>TRACE</value>
            <level>TRACE</level>
        </MDCValueLevelPair>
        <MDCValueLevelPair>
            <value>DEBUG</value>
            <level>DEBUG</level>
        </MDCValueLevelPair>
    </turboFilter>

    ...
  
</configuration>

LogLevelFilter.scala

import com.hotels.dps.rest.filters.LogLevelFilter._
import com.twitter.finagle.http.{Request, Response}
import com.twitter.finagle.{Service, SimpleFilter}
import com.twitter.util.Future
import org.slf4j.MDC

object LogLevelFilter {
  val LogLevelKey: String = "X-Log-Level"
}

class LogLevelFilter extends SimpleFilter[Request, Response] {

  override def apply(request: Request, service: Service[Request, Response]): Future[Response] = {
    request.headerMap.get(LogLevelKey).foreach(logLevel => MDC.put(LogLevelKey, logLevel))
    service(request).ensure {
      MDC.remove(LogLevelKey)
    }
  }
}