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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
import kamon.Kamon
import scala.annotation.tailrec
class StatsDMetricsSender extends Actor with ActorLogging {
import context.system
val statsDExtension = Kamon(StatsD)
val remote = new InetSocketAddress(statsDExtension.hostname, statsDExtension.port)
val maxPacketSize = 1024
IO(Udp) ! Udp.SimpleSender
def receive = {
case Udp.SimpleSenderReady ⇒
context.become(ready(sender))
}
def ready(udpSender: ActorRef): Receive = {
case StatsD.MetricBatch(metrics) ⇒ writeDown(metrics, ByteString.empty, udpSender)
}
def flushToRemote(data: ByteString, udpSender: ActorRef): Unit = udpSender ! Udp.Send(data, remote)
@tailrec final def writeDown(metrics: Iterable[StatsD.Metric], buffer: ByteString, udpSender: ActorRef): Unit = {
if(metrics.isEmpty)
flushToRemote(buffer, udpSender)
else {
val headData = metrics.head.toByteString
if(buffer.size + headData.size > maxPacketSize) {
flushToRemote(buffer, udpSender)
writeDown(metrics.tail, headData, udpSender)
} else {
writeDown(metrics.tail, buffer ++ headData, udpSender)
}
}
}
}
object StatsDMetricsSender {
def props: Props = Props[StatsDMetricsSender]
}
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