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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
import akka.actor.{ ExtendedActorSystem, Extension, ExtensionId, ExtensionIdProvider }
import akka.event.Logging
import kamon.Kamon
import kamon.http.HttpServerMetrics
import kamon.metric.Entity
import play.api.libs.ws.WSRequest
import play.api.mvc.RequestHeader
object Play extends ExtensionId[PlayExtension] with ExtensionIdProvider {
override def lookup(): ExtensionId[_ <: Extension] = Play
override def createExtension(system: ExtendedActorSystem): PlayExtension = new PlayExtension(system)
val SegmentLibraryName = "WS-client"
}
class PlayExtension(private val system: ExtendedActorSystem) extends Kamon.Extension {
val log = Logging(system, classOf[PlayExtension])
log.info(s"Starting the Kamon(Play) extension")
private val config = system.settings.config.getConfig("kamon.play")
val httpServerMetrics = Kamon.metrics.entity(HttpServerMetrics, "play-server")
val includeTraceToken: Boolean = config.getBoolean("automatic-trace-token-propagation")
val traceTokenHeaderName: String = config.getString("trace-token-header-name")
private val nameGeneratorFQN = config.getString("name-generator")
private val nameGenerator: PlayNameGenerator = system.dynamicAccess.createInstanceFor[PlayNameGenerator](nameGeneratorFQN, Nil).get
def generateTraceName(requestHeader: RequestHeader): String = nameGenerator.generateTraceName(requestHeader)
def generateHttpClientSegmentName(request: WSRequest): String = nameGenerator.generateHttpClientSegmentName(request)
}
trait PlayNameGenerator {
def generateTraceName(requestHeader: RequestHeader): String
def generateHttpClientSegmentName(request: WSRequest): String
}
class DefaultPlayNameGenerator extends PlayNameGenerator {
def generateTraceName(requestHeader: RequestHeader): String = s"${requestHeader.method}: ${requestHeader.uri}"
def generateHttpClientSegmentName(request: WSRequest): String = request.url
}
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