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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.{ TraceContext, TraceContextAware }
import org.aspectj.lang.ProceedingJoinPoint
import org.aspectj.lang.annotation._
import org.slf4j.MDC
@Aspect
class LoggerLikeInstrumentation {
import 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: TraceContextAware): Any = {
withMDC(logger.traceContext) {
pjp.proceed()
}
}
}
object LoggerLikeInstrumentation {
def withMDC[A](currentContext: Option[TraceContext])(block: ⇒ A): A = {
val keys = currentContext.map(extractProperties).map(putAndExtractKeys)
try block finally keys.map(k ⇒ k.foreach(MDC.remove(_)))
}
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(ctx: TraceContext): Iterable[Map[String, Any]] = ctx.traceLocalStorage.underlyingStorage.values.map {
case traceLocalValue @ (p: Product) ⇒ {
val properties = p.productIterator
traceLocalValue.getClass.getDeclaredFields.filter(field ⇒ field.getName != "$outer").map(_.getName -> properties.next).toMap
}
case anything ⇒ Map.empty[String, Any]
}
}
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