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/* =========================================================================================
* Copyright © 2013-2014 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.play.instrumentation
import kamon.trace._
import org.aspectj.lang.ProceedingJoinPoint
import org.aspectj.lang.annotation._
import org.slf4j.MDC
import play.api.LoggerLike
@Aspect
class LoggerLikeInstrumentation {
import kamon.play.instrumentation.LoggerLikeInstrumentation._
@DeclareMixin("play.api.LoggerLike+")
def mixinContextAwareToLoggerLike: TraceContextAware = TraceContextAware.default
@Pointcut("execution(* play.api.LoggerLike+.info(..))")
def infoPointcut(): Unit = {}
@Pointcut("execution(* play.api.LoggerLike+.warn(..))")
def warnPointcut(): Unit = {}
@Pointcut("execution(* play.api.LoggerLike+.error(..))")
def errorPointcut(): Unit = {}
@Pointcut("execution(* play.api.LoggerLike+.trace(..))")
def tracePointcut(): Unit = {}
@Around("(infoPointcut() || warnPointcut() || errorPointcut() || tracePointcut()) && this(logger)")
def aroundLog(pjp: ProceedingJoinPoint, logger: LoggerLike): Any = {
withMDC {
pjp.proceed()
}
}
}
object LoggerLikeInstrumentation {
@inline final def withMDC[A](block: ⇒ A): A = {
val keys = putAndExtractKeys(extractProperties(TraceRecorder.currentContext))
try block finally keys.foreach(k ⇒ MDC.remove(k))
}
def putAndExtractKeys(values: Iterable[Map[String, Any]]): Iterable[String] = values.map {
value ⇒ value.map { case (key, value) ⇒ MDC.put(key, value.toString); key }
}.flatten
def extractProperties(traceContext: TraceContext): Iterable[Map[String, Any]] = traceContext match {
case ctx: DefaultTraceContext ⇒
ctx.traceLocalStorage.underlyingStorage.values.collect {
case traceLocalValue @ (p: Product) ⇒ {
val properties = p.productIterator
traceLocalValue.getClass.getDeclaredFields.filter(field ⇒ field.getName != "$outer").map(_.getName -> properties.next).toMap
}
}
case EmptyTraceContext ⇒ Iterable.empty[Map[String, Any]]
}
}
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