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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.statsd
import akka.actor._
import kamon.Kamon
import kamon.metrics._
import scala.concurrent.duration._
import scala.collection.JavaConverters._
import akka.util.ByteString
object StatsD extends ExtensionId[StatsDExtension] with ExtensionIdProvider {
override def lookup(): ExtensionId[_ <: Extension] = StatsD
override def createExtension(system: ExtendedActorSystem): StatsDExtension = new StatsDExtension(system)
sealed trait Metric {
def key: String
def value: Long
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: Long = 1, samplingRate: Double = 1.0) extends Metric {
val suffix: String = "c"
}
case class Timing(key: String, value: Long, samplingRate: Double = 1.0) extends Metric {
val suffix: String = "ms"
}
case class Gauge(key: String, value: Long, samplingRate: Double = 1.0) extends Metric {
val suffix: String = "g"
}
case class MetricBatch(metrics: Vector[Metric])
}
class StatsDExtension(private val system: ExtendedActorSystem) extends Kamon.Extension {
private val config = system.settings.config.getConfig("kamon.statsd")
val hostname = config.getString("hostname")
val port = config.getInt("port")
val prefix = config.getString("prefix")
val flushInterval = config.getMilliseconds("flush-interval")
val tickInterval = system.settings.config.getMilliseconds("kamon.metrics.tick-interval")
val statsDMetricsListener = buildMetricsListener(tickInterval, flushInterval)
val includedActors = config.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")
}
}
}
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