1 files changed, 110 insertions, 0 deletions
diff --git a/kamon-statsd/src/main/scala/kamon/statsd/Statsd.scala b/kamon-statsd/src/main/scala/kamon/statsd/Statsd.scala
new file mode 100644
index 00000000..0ded1394
--- /dev/null
+++ b/kamon-statsd/src/main/scala/kamon/statsd/Statsd.scala
@@ -0,0 +1,110 @@
+/*
+ * =========================================================================================
+ * 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.statsd
+
+import akka.actor._
+import kamon.Kamon
+import kamon.metrics._
+import scala.concurrent.duration._
+import scala.collection.JavaConverters._
+import akka.util.ByteString
+import com.typesafe.config.Config
+import java.lang.management.ManagementFactory
+
+object StatsD extends ExtensionId[StatsDExtension] with ExtensionIdProvider {
+  override def lookup(): ExtensionId[_ <: Extension] = StatsD
+  override def createExtension(system: ExtendedActorSystem): StatsDExtension = new StatsDExtension(system)
+
+
+  trait MetricKeyGenerator {
+    def generateKey(groupIdentity: MetricGroupIdentity, metricIdentity: MetricIdentity): String
+  }
+
+  sealed trait Metric {
+    def key: String
+    def value: Double
+    def suffix: String
+    def samplingRate: Double
+
+    /*
+     * Creates the stats string to send to StatsD.
+     * For counters, it provides something like {@code key:value|c}.
+     * For timing, it provides something like {@code key:millis|ms}.
+     * If sampling rate is less than 1, it provides something like {@code key:value|type|@rate}
+     */
+    def toByteString: ByteString =
+      if(samplingRate >= 1D)
+        ByteString(s"$key:$value|$suffix")
+      else
+        ByteString(s"$key:$value|$suffix|@$samplingRate")
+  }
+
+  case class Counter(key: String, value: Double = 1D, samplingRate: Double = 1.0) extends Metric {
+    val suffix: String = "c"
+  }
+
+  case class Timing(key: String, value: Double, samplingRate: Double = 1.0) extends Metric {
+    val suffix: String = "ms"
+  }
+
+  case class Gauge(key: String, value: Double, samplingRate: Double = 1.0) extends Metric {
+    val suffix: String = "g"
+  }
+
+  case class MetricBatch(metrics: Iterable[Metric])
+}
+
+
+class StatsDExtension(system: ExtendedActorSystem) extends Kamon.Extension {
+  private val statsDConfig = system.settings.config.getConfig("kamon.statsd")
+
+  val hostname = statsDConfig.getString("hostname")
+  val port = statsDConfig.getInt("port")
+  val flushInterval = statsDConfig.getMilliseconds("flush-interval")
+  val maxPacketSize = statsDConfig.getInt("max-packet-size")
+  val tickInterval = system.settings.config.getMilliseconds("kamon.metrics.tick-interval")
+
+  val statsDMetricsListener = buildMetricsListener(tickInterval, flushInterval)
+
+  val includedActors = statsDConfig.getStringList("includes.actor").asScala
+  for(actorPathPattern <- includedActors) {
+    Kamon(Metrics)(system).subscribe(ActorMetrics, actorPathPattern, statsDMetricsListener, permanently = true)
+  }
+
+
+  def buildMetricsListener(tickInterval: Long, flushInterval: Long): ActorRef = {
+    assert(flushInterval >= tickInterval, "StatsD flush-interval needs to be equal or greater to the tick-interval")
+
+    val metricsTranslator = system.actorOf(StatsDMetricTranslator.props, "statsd-metrics-translator")
+    if(flushInterval == tickInterval) {
+      // No need to buffer the metrics, let's go straight to the metrics translator.
+      metricsTranslator
+    } else {
+      system.actorOf(TickMetricSnapshotBuffer.props(flushInterval.toInt.millis, metricsTranslator), "statsd-metrics-buffer")
+    }
+  }
+}
+
+
+class SimpleMetricKeyGenerator(config: Config) extends StatsD.MetricKeyGenerator {
+  val application = config.getString("kamon.statsd.simple-metric-key-generator.application")
+  val localhostName = ManagementFactory.getRuntimeMXBean.getName.split('@')(1)
+
+  def generateKey(groupIdentity: MetricGroupIdentity, metricIdentity: MetricIdentity): String =
+    application + "." + localhostName + "." + groupIdentity.category.name + "." + groupIdentity.name + "." + metricIdentity.name
+}
+