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/*
* =========================================================================================
* Copyright © 2013-2015 the kamon project <http://kamon.io/>
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific language governing permissions
* and limitations under the License.
* =========================================================================================
*/
package kamon.util
import java.util.function.Supplier
import kamon.trace.{SpanContext => KamonSpanContext}
import kamon.Kamon
import org.slf4j.MDC
import scala.collection.JavaConverters._
object BaggageOnMDC {
/**
* Copy all baggage keys into SLF4J's MDC, evaluates the provided piece of code and removes the baggage keys
* afterwards, only when there is a currently active span. Optionally adds the Trace ID as well.
*
*/
def withBaggageOnMDC[T](includeTraceID: Boolean, code: => T): T = {
val activeSpan = Kamon.activeSpan()
if(activeSpan == null)
code
else {
val baggageItems = activeSpan.context().baggageItems().asScala
baggageItems.foreach(entry => MDC.put(entry.getKey, entry.getValue))
if(includeTraceID)
addTraceIDToMDC(activeSpan.context())
val evaluatedCode = code
baggageItems.foreach(entry => MDC.remove(entry.getKey))
if(includeTraceID)
removeTraceIDFromMDC()
evaluatedCode
}
}
def withBaggageOnMDC[T](code: Supplier[T]): T =
withBaggageOnMDC(true, code.get())
def withBaggageOnMDC[T](includeTraceID: Boolean, code: Supplier[T]): T =
withBaggageOnMDC(includeTraceID, code.get())
def withBaggageOnMDC[T](code: => T): T =
withBaggageOnMDC(true, code)
private val TraceIDKey = "trace_id"
private def addTraceIDToMDC(context: io.opentracing.SpanContext): Unit = context match {
case ctx: KamonSpanContext => MDC.put(TraceIDKey, HexCodec.toLowerHex(ctx.traceID))
case _ =>
}
private def removeTraceIDFromMDC(): Unit =
MDC.remove(TraceIDKey)
}
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