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/*
* =========================================================================================
* Copyright © 2013-2015 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.util.http.HttpServerMetrics
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: NameGenerator = system.dynamicAccess.createInstanceFor[NameGenerator](nameGeneratorFQN, Nil).get
def generateTraceName(requestHeader: RequestHeader): String = nameGenerator.generateTraceName(requestHeader)
def generateHttpClientSegmentName(request: WSRequest): String = nameGenerator.generateHttpClientSegmentName(request)
}
trait NameGenerator {
def generateTraceName(requestHeader: RequestHeader): String
def generateHttpClientSegmentName(request: WSRequest): String
}
class DefaultNameGenerator extends NameGenerator {
import scala.collection.concurrent.TrieMap
import play.api.Routes
import java.util.Locale
import kamon.util.TriemapAtomicGetOrElseUpdate.Syntax
private val cache = TrieMap.empty[String, String]
private val normalizePattern = """\$([^<]+)<[^>]+>""".r
def generateTraceName(requestHeader: RequestHeader): String = requestHeader.tags.get(Routes.ROUTE_VERB).map { verb ⇒
val path = requestHeader.tags(Routes.ROUTE_PATTERN)
cache.atomicGetOrElseUpdate(s"$verb$path", {
val traceName = {
// Convert paths of form GET /foo/bar/$paramname<regexp>/blah to foo.bar.paramname.blah.get
val p = normalizePattern.replaceAllIn(path, "$1").replace('/', '.').dropWhile(_ == '.')
val normalisedPath = {
if (p.lastOption.exists(_ != '.')) s"$p."
else p
}
s"$normalisedPath${verb.toLowerCase(Locale.ENGLISH)}"
}
traceName
})
} getOrElse "UntaggedTrace"
def generateHttpClientSegmentName(request: WSRequest): String = request.url
}
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