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/*
* =========================================================================================
* Copyright © 2013 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.spray
import akka.actor.{ ExtendedActorSystem, ExtensionIdProvider, ExtensionId }
import akka.actor
import akka.event.{ Logging, LoggingAdapter }
import kamon.Kamon
import kamon.http.HttpServerMetrics
import kamon.metric.Entity
import spray.http.HttpHeaders.Host
import spray.http.HttpRequest
object Spray extends ExtensionId[SprayExtension] with ExtensionIdProvider {
def lookup(): ExtensionId[_ <: actor.Extension] = Spray
def createExtension(system: ExtendedActorSystem): SprayExtension = new SprayExtensionImpl(system)
val SegmentLibraryName = "spray-client"
}
trait SprayExtension extends Kamon.Extension {
def settings: SprayExtensionSettings
def log: LoggingAdapter
def httpServerMetrics: HttpServerMetrics
def generateTraceName(request: HttpRequest): String
def generateRequestLevelApiSegmentName(request: HttpRequest): String
def generateHostLevelApiSegmentName(request: HttpRequest): String
}
class SprayExtensionImpl(system: ExtendedActorSystem) extends SprayExtension {
val settings = SprayExtensionSettings(system)
val log = Logging(system, "SprayExtension")
val httpServerMetrics = {
val entity = Entity("spray-server", HttpServerMetrics.category)
Kamon.metrics.entity(HttpServerMetrics, entity)
}
def generateTraceName(request: HttpRequest): String =
settings.nameGenerator.generateTraceName(request)
def generateRequestLevelApiSegmentName(request: HttpRequest): String =
settings.nameGenerator.generateRequestLevelApiSegmentName(request)
def generateHostLevelApiSegmentName(request: HttpRequest): String =
settings.nameGenerator.generateHostLevelApiSegmentName(request)
}
trait NameGenerator {
def generateTraceName(request: HttpRequest): String
def generateRequestLevelApiSegmentName(request: HttpRequest): String
def generateHostLevelApiSegmentName(request: HttpRequest): String
}
class DefaultNameGenerator extends NameGenerator {
def generateRequestLevelApiSegmentName(request: HttpRequest): String = {
val uriAddress = request.uri.authority.host.address
if (uriAddress.equals("")) hostFromHeaders(request).getOrElse("unknown-host") else uriAddress
}
def generateHostLevelApiSegmentName(request: HttpRequest): String =
hostFromHeaders(request).getOrElse("unknown-host")
def generateTraceName(request: HttpRequest): String =
"UnnamedTrace"
private def hostFromHeaders(request: HttpRequest): Option[String] =
request.header[Host].map(_.host)
}
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