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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.{ ActorLogging, Props, ActorRef, Actor }
import akka.io.{ Udp, IO }
import java.net.InetSocketAddress
import akka.util.ByteString
class StatsdMetricsSender(statPrefix: String, remote: InetSocketAddress) extends Actor with ActorLogging {
import StatsdMetricsSender._
import context.system
IO(Udp) ! Udp.SimpleSender
def receive = {
case Udp.SimpleSenderReady ⇒
context.become(ready(sender))
}
def ready(send: ActorRef): Receive = {
case metric: StatsdMetric ⇒
send ! Udp.Send(toByteString(statPrefix, metric), remote)
case _ ⇒ log.error("Unknown Metric")
}
}
object StatsdMetricsSender {
sealed trait StatsdMetric
case class Counter(key: String, value: Long = 1, suffix: String = "c", samplingRate: Double = 1.0) extends StatsdMetric
case class Timing(key: String, millis: Long, suffix: String = "ms", samplingRate: Double = 1.0) extends StatsdMetric
case class Gauge(key: String, value: Long, suffix: String = "g", samplingRate: Double = 1.0) extends StatsdMetric
def props(statPrefix: String, remote: InetSocketAddress): Props = Props(new StatsdMetricsSender(statPrefix, remote))
def toByteString(statPrefix: String, metric: StatsdMetric): ByteString = metric match {
case Counter(key, value, suffix, samplingRate) ⇒ statFor(statPrefix, key, value, suffix, samplingRate)
case Timing(key, value, suffix, samplingRate) ⇒ statFor(statPrefix, key, value, suffix, samplingRate)
case Gauge(key, value, suffix, samplingRate) ⇒ statFor(statPrefix, key, value, suffix, samplingRate)
}
/*
* Creates the stat 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}
*/
private[this] def statFor(statPrefix: String, key: String, value: Long, suffix: String, samplingRate: Double): ByteString = {
samplingRate match {
case x if x >= 1.0 ⇒ ByteString(s"${statPrefix}.${key}:${value}|$suffix")
case _ ⇒ ByteString(s"${statPrefix}.${key}:${value}|${suffix}|@$samplingRate")
}
}
}
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