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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.{ TraceRecorder, TraceContextAware }
import kamon.Kamon
import kamon.play.Play
import play.libs.Akka
import play.api.mvc._
import akka.actor.ActorSystem
import org.aspectj.lang.ProceedingJoinPoint
import org.aspectj.lang.annotation._
import scala.Some
import kamon.util.Contexts
@Aspect
class RequestInstrumentation {
@DeclareMixin("play.api.mvc.RequestHeader$$anon$4")
def mixinContextAwareNewRequest: TraceContextAware = TraceContextAware.default
@Pointcut("execution(* play.api.GlobalSettings+.onStart(*)) && args(application)")
def onStart(application: play.api.Application): Unit = {}
@After("onStart(application)")
def afterApplicationStart(application: play.api.Application): Unit = {
Kamon(Play)(Akka.system())
}
@Pointcut("execution(* play.api.GlobalSettings+.doFilter(*)) && args(next)")
def doFilter(next: EssentialAction): Unit = {}
@Around("doFilter(next)")
def afterDoFilter(pjp: ProceedingJoinPoint, next: EssentialAction): Any = {
Filters(pjp.proceed(Array(next)).asInstanceOf[EssentialAction], kamonRequestFilter)
}
@Pointcut("execution(* play.api.GlobalSettings+.onError(..)) && args(request, ex)")
def onError(request: TraceContextAware, ex: Throwable): Unit = {}
@Around("onError(request, ex)")
def aroundOnError(pjp: ProceedingJoinPoint, request: TraceContextAware, ex: Throwable): Any = request.traceContext match {
case None ⇒ pjp.proceed()
case Some(ctx) ⇒ {
val actorSystem = ctx.system
Kamon(Play)(actorSystem).publishErrorMessage(actorSystem, ex.getMessage, ex)
pjp.proceed()
}
}
private[this] val kamonRequestFilter = Filter { (nextFilter, requestHeader) ⇒
processRequest(requestHeader)
val incomingContext = TraceRecorder.currentContext
val executor = Kamon(Play)(Akka.system()).defaultDispatcher
nextFilter(requestHeader).map { result ⇒
TraceRecorder.finish()
val simpleResult = incomingContext match {
case None ⇒ result
case Some(traceContext) ⇒
val playExtension = Kamon(Play)(traceContext.system)
if (playExtension.includeTraceToken) {
result.withHeaders(playExtension.traceTokenHeaderName -> traceContext.token)
} else result
}
simpleResult
}(executor)
}
private[this] def processRequest(requestHeader: RequestHeader): Unit = {
val system: ActorSystem = Akka.system()
val playExtension = Kamon(Play)(system)
val defaultTraceName: String = s"${requestHeader.method}: ${requestHeader.uri}"
val token = if (playExtension.includeTraceToken) {
requestHeader.headers.toSimpleMap.find(_._1 == playExtension.traceTokenHeaderName).map(_._2)
} else None
TraceRecorder.start(defaultTraceName, token)(system)
}
}
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