From 01a34f67ff75419c440f2e69c0a0db888a670a34 Mon Sep 17 00:00:00 2001
From: Ivan Topolnjak <ivantopo@gmail.com>
Date: Mon, 12 Jan 2015 01:45:27 +0100
Subject: ! all: improve the metric recorders infrastructure

---
 .../main/scala/kamon/spray/SprayExtension.scala    | 88 ++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 kamon-spray/src/main/scala/kamon/spray/SprayExtension.scala

(limited to 'kamon-spray/src/main/scala/kamon/spray/SprayExtension.scala')

diff --git a/kamon-spray/src/main/scala/kamon/spray/SprayExtension.scala b/kamon-spray/src/main/scala/kamon/spray/SprayExtension.scala
new file mode 100644
index 00000000..3df8d972
--- /dev/null
+++ b/kamon-spray/src/main/scala/kamon/spray/SprayExtension.scala
@@ -0,0 +1,88 @@
+/*
+ * =========================================================================================
+ * 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, Metrics }
+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 metricsExtension = Metrics.get(system)
+    val factory = metricsExtension.instrumentFactory(HttpServerMetrics.category)
+    val entity = Entity("spray-server", HttpServerMetrics.category)
+
+    Metrics.get(system).register(entity, new HttpServerMetrics(factory)).recorder
+  }
+
+  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 SprayNameGenerator {
+  def generateTraceName(request: HttpRequest): String
+  def generateRequestLevelApiSegmentName(request: HttpRequest): String
+  def generateHostLevelApiSegmentName(request: HttpRequest): String
+}
+
+class DefaultSprayNameGenerator extends SprayNameGenerator {
+
+  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 =
+    request.method.value + ": " + request.uri.path
+
+  private def hostFromHeaders(request: HttpRequest): Option[String] =
+    request.header[Host].map(_.host)
+
+}
-- 
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