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/*
* =========================================================================================
* Copyright © 2013-2015 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 java.net.InetSocketAddress
import java.text.{ DecimalFormat, DecimalFormatSymbols }
import java.util.Locale
import akka.actor.{ Actor, ActorRef, ActorSystem }
import akka.io.{ IO, Udp }
import akka.util.ByteString
import com.typesafe.config.Config
import kamon.metric.SubscriptionsDispatcher.TickMetricSnapshot
trait StatsDValueFormatters {
val symbols = DecimalFormatSymbols.getInstance(Locale.US)
symbols.setDecimalSeparator('.')
// Just in case there is some weird locale config we are not aware of.
// Absurdly high number of decimal digits, let the other end lose precision if it needs to.
val samplingRateFormat = new DecimalFormat("#.################################################################", symbols)
def encodeStatsDTimer(level: Long, count: Long): String = {
val samplingRate: Double = 1D / count
level.toString + "|ms" + (if (samplingRate != 1D) "|@" + samplingRateFormat.format(samplingRate) else "")
}
def encodeStatsDCounter(count: Long): String = count.toString + "|c"
}
/**
* Base class for different StatsD senders utilizing UDP protocol. It implies use of one statsd server.
* @param statsDConfig Config to read settings specific to this sender
* @param metricKeyGenerator Key generator for all metrics sent by this sender
*/
abstract class UDPBasedStatsDMetricsSender(statsDConfig: Config, metricKeyGenerator: MetricKeyGenerator)
extends Actor with UdpExtensionProvider with StatsDValueFormatters {
import context.system
val statsDHost = statsDConfig.getString("hostname")
val statsDPort = statsDConfig.getInt("port")
udpExtension ! Udp.SimpleSender
lazy val socketAddress = new InetSocketAddress(statsDHost, statsDPort)
def receive = {
case Udp.SimpleSenderReady ⇒
context.become(ready(sender))
}
def ready(udpSender: ActorRef): Receive = {
case tick: TickMetricSnapshot ⇒
writeMetricsToRemote(tick,
(data: String) ⇒ udpSender ! Udp.Send(ByteString(data), socketAddress))
}
def writeMetricsToRemote(tick: TickMetricSnapshot, flushToUDP: String ⇒ Unit): Unit
}
trait UdpExtensionProvider {
def udpExtension(implicit system: ActorSystem): ActorRef = IO(Udp)
}
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