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package kamon.khronus
import akka.actor._
import akka.event.Logging
import com.despegar.khronus.jclient.KhronusClient
import kamon.Kamon
import kamon.metric.{ Entity, EntitySnapshot }
import kamon.metric.SubscriptionsDispatcher.TickMetricSnapshot
import kamon.metric.instrument.{ Counter, Histogram }
import scala.util.Try
object MetricReporter extends ExtensionId[MetricReporterExtension] with ExtensionIdProvider {
override def lookup(): ExtensionId[_ <: Extension] = MetricReporter
override def createExtension(system: ExtendedActorSystem): MetricReporterExtension = new MetricReporterExtension(system)
}
class MetricReporterExtension(system: ExtendedActorSystem) extends Kamon.Extension {
val log = Logging(system, classOf[MetricReporterExtension])
log.info("Starting the Kamon(Khronus) extension")
val subscriber = system.actorOf(Props[MetricReporterSubscriber], "kamon-khronus")
Kamon.metrics.subscribe("histogram", "**", subscriber, permanently = true)
Kamon.metrics.subscribe("counter", "**", subscriber, permanently = true)
Kamon.metrics.subscribe("gauge", "**", subscriber, permanently = true)
Kamon.metrics.subscribe("trace", "**", subscriber, permanently = true)
Kamon.metrics.subscribe("executor-service", "**", subscriber, permanently = true)
}
class MetricReporterSubscriber extends Actor with ActorLogging {
import context._
lazy val khronusClient: Try[KhronusClient] = {
val kc =
for {
config ← Try(Kamon.config.getConfig("kamon.khronus"))
host ← Try(config.getString("host"))
appName ← Try(config.getString("app-name"))
interval ← Try(config.getLong("interval"))
measures ← Try(config.getInt("max-measures"))
kc ← Try(new KhronusClient.Builder()
.withApplicationName(appName)
.withSendIntervalMillis(interval)
.withMaximumMeasures(measures)
.withHosts(host)
.build)
} yield kc
kc.failed.foreach(ex ⇒ log.error(s"Khronus metrics reporting inoperative: {}", ex))
kc
}
override def preStart() = khronusClient.foreach(_ ⇒ become(operative))
def receive = { case _ ⇒ }
val operative: Receive = {
case tick: TickMetricSnapshot ⇒ reportMetrics(tick)
}
def reportMetrics(tick: TickMetricSnapshot): Unit = {
// Group all the user metrics together.
val histograms = Map.newBuilder[String, Option[Histogram.Snapshot]]
val traces = Map.newBuilder[String, Option[Histogram.Snapshot]]
val counters = Map.newBuilder[String, Option[Counter.Snapshot]]
val gauges = Map.newBuilder[String, Option[Histogram.Snapshot]]
tick.metrics foreach {
case (entity, snapshot) if entity.category == "histogram" ⇒ histograms += (entity.name -> snapshot.histogram("histogram"))
case (entity, snapshot) if entity.category == "counter" ⇒ counters += (entity.name -> snapshot.counter("counter"))
case (entity, snapshot) if entity.category == "gauge" ⇒ gauges += (entity.name -> snapshot.gauge("gauge"))
case (entity, snapshot) if entity.category == "trace" ⇒ traces += (entity.name -> snapshot.histogram("elapsed-time"))
case (entity, snapshot) if entity.category == "executor-service" ⇒ pushExecutorMetrics(entity, snapshot)
case ignoreEverythingElse ⇒
}
pushToKhronus(histograms.result(), counters.result(), gauges.result(), traces.result())
}
def pushToKhronus(histograms: Map[String, Option[Histogram.Snapshot]],
counters: Map[String, Option[Counter.Snapshot]],
gauges: Map[String, Option[Histogram.Snapshot]],
traces: Map[String, Option[Histogram.Snapshot]]): Unit = {
counters.foreach {
case (name, Some(snapshot)) ⇒
pushCounter(name, snapshot)
case _ ⇒
}
gauges.foreach {
case (name, Some(snapshot)) ⇒
pushGauge(name, snapshot)
case _ ⇒
}
histograms.foreach {
case (name, Some(snapshot)) ⇒
pushSnapshot(name, snapshot)
case _ ⇒
}
traces.foreach {
case (name, Some(snapshot)) ⇒
pushSnapshot(name, snapshot)
case _ ⇒
}
}
def pushExecutorMetrics(entity: Entity, snapshot: EntitySnapshot): Unit = entity.tags.get("executor-type") match {
case Some("fork-join-pool") ⇒ pushForkJoinPoolMetrics(entity.name, snapshot)
case Some("thread-pool-executor") ⇒ pushThreadPoolExecutorMetrics(entity.name, snapshot)
case ignoreOthers ⇒
}
def pushForkJoinPoolMetrics(name: String, forkJoinMetrics: EntitySnapshot): Unit = {
for {
paralellism ← forkJoinMetrics.minMaxCounter("parallelism")
poolSize ← forkJoinMetrics.gauge("pool-size")
activeThreads ← forkJoinMetrics.gauge("active-threads")
runningThreads ← forkJoinMetrics.gauge("running-threads")
queuedTaskCount ← forkJoinMetrics.gauge("queued-task-count")
} {
pushSnapshot(s"$name.parallelism", paralellism)
pushSnapshot(s"$name.pool-size", poolSize)
pushSnapshot(s"$name.active-threads", activeThreads)
pushSnapshot(s"$name.running-threads", runningThreads)
pushSnapshot(s"$name.queued-task-count", queuedTaskCount)
}
}
def pushThreadPoolExecutorMetrics(name: String, threadPoolMetrics: EntitySnapshot): Unit = {
for {
corePoolSize ← threadPoolMetrics.gauge("core-pool-size")
maxPoolSize ← threadPoolMetrics.gauge("max-pool-size")
poolSize ← threadPoolMetrics.gauge("pool-size")
activeThreads ← threadPoolMetrics.gauge("active-threads")
processedTasks ← threadPoolMetrics.gauge("processed-tasks")
} {
pushSnapshot(s"$name.core-pool-size", corePoolSize)
pushSnapshot(s"$name.max-pool-size", maxPoolSize)
pushSnapshot(s"$name.pool-size", poolSize)
pushSnapshot(s"$name.active-threads", activeThreads)
pushSnapshot(s"$name.processed-tasks", processedTasks)
}
}
def pushSnapshot(name: String, snapshot: Histogram.Snapshot): Unit = {
khronusClient.foreach { kc ⇒
snapshot.recordsIterator.foreach { record ⇒
for (i ← 1L to record.count)
kc.recordTime(name, record.level)
}
}
}
def pushGauge(name: String, snapshot: Histogram.Snapshot): Unit = {
khronusClient.foreach { kc ⇒
snapshot.recordsIterator.foreach { record ⇒
for (i ← 1L to record.count)
kc.recordGauge(name, record.level)
}
}
}
def pushCounter(name: String, snapshot: Counter.Snapshot): Unit = {
khronusClient.foreach { kc ⇒
kc.recordGauge(name, snapshot.count)
}
}
}
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