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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.metric.TraceMetrics.HttpClientRequest
import kamon.trace.{ TraceContext, TraceRecorder }
import org.aspectj.lang.ProceedingJoinPoint
import org.aspectj.lang.annotation.{ Around, Aspect, Pointcut }
import play.api.libs.ws.ning.NingWSRequest
import play.api.libs.ws.{ WSRequest, WSResponse }
import play.libs.Akka
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Future
@Aspect
class WSInstrumentation {
@Pointcut("execution(* play.api.libs.ws.ning.NingWSRequest.execute()) && this(request)")
def onExecuteRequest(request: WSRequest): Unit = {}
@Around("onExecuteRequest(request)")
def aroundExecuteRequest(pjp: ProceedingJoinPoint, request: WSRequest): Any = {
import kamon.play.instrumentation.WSInstrumentation._
withOrNewTraceContext(TraceRecorder.currentContext)(request) {
val response = pjp.proceed().asInstanceOf[Future[WSResponse]]
val segmentHandle = TraceRecorder.startSegment(HttpClientRequest(request.url), basicRequestAttributes(request))
response.map {
r ⇒
segmentHandle.map(_.finish())
TraceRecorder.finish()
}
response
}
}
}
object WSInstrumentation {
def uri(request: WSRequest): java.net.URI = request.asInstanceOf[NingWSRequest].builder.build().getURI
def basicRequestAttributes(request: WSRequest): Map[String, String] = {
Map[String, String](
"host" -> uri(request).getHost,
"path" -> uri(request).getPath,
"method" -> request.method)
}
def withOrNewTraceContext[T](context: Option[TraceContext])(request: WSRequest)(thunk: ⇒ T): T = {
if (context.isDefined) TraceRecorder.withTraceContext(context) { thunk }
else TraceRecorder.withNewTraceContext(request.url, metadata = basicRequestAttributes(request)) { thunk }(Akka.system())
}
}
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