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/*
* =========================================================================================
* Copyright © 2013 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.testkit.{ TestKitBase, TestProbe }
import akka.actor.{ ActorRef, Props, ActorSystem }
import org.scalatest.{ Matchers, WordSpecLike }
import kamon.metrics._
import akka.io.Udp
import org.HdrHistogram.HdrRecorder
import kamon.metrics.Subscriptions.TickMetricSnapshot
import java.lang.management.ManagementFactory
import java.net.InetSocketAddress
import com.typesafe.config.ConfigFactory
import kamon.metrics.instruments.CounterRecorder
class StatsDMetricSenderSpec extends TestKitBase with WordSpecLike with Matchers {
implicit lazy val system = ActorSystem("statsd-metric-sender-spec",
ConfigFactory.parseString("kamon.statsd.max-packet-size = 256 bytes"))
"the StatsDMetricSender" should {
"flush the metrics data after processing the tick, even if the max-packet-size is not reached" in new UdpListenerFixture {
val testMetricName = "test-metric"
val testMetricKey = buildMetricKey(testMetricName)
val testRecorder = HdrRecorder(1000L, 2, Scale.Unit)
testRecorder.record(10L)
val udp = setup(Map(testMetricName -> testRecorder.collect()))
val Udp.Send(data, _, _) = udp.expectMsgType[Udp.Send]
data.utf8String should be(s"$testMetricKey:10|ms")
}
"render several measurements of the same key under a single (key + multiple measurements) packet" in new UdpListenerFixture {
val testMetricName = "test-metric"
val testMetricKey = buildMetricKey(testMetricName)
val testRecorder = HdrRecorder(1000L, 2, Scale.Unit)
testRecorder.record(10L)
testRecorder.record(11L)
testRecorder.record(12L)
val udp = setup(Map(testMetricName -> testRecorder.collect()))
val Udp.Send(data, _, _) = udp.expectMsgType[Udp.Send]
data.utf8String should be(s"$testMetricKey:10|ms:11|ms:12|ms")
}
"include the correspondent sampling rate when rendering multiple occurrences of the same value" in new UdpListenerFixture {
val testMetricName = "test-metric"
val testMetricKey = buildMetricKey(testMetricName)
val testRecorder = HdrRecorder(1000L, 2, Scale.Unit)
testRecorder.record(10L)
testRecorder.record(10L)
val udp = setup(Map(testMetricName -> testRecorder.collect()))
val Udp.Send(data, _, _) = udp.expectMsgType[Udp.Send]
data.utf8String should be(s"$testMetricKey:10|ms|@0.5")
}
"flush the packet when the max-packet-size is reached" in new UdpListenerFixture {
val testMetricName = "test-metric"
val testMetricKey = buildMetricKey(testMetricName)
val testRecorder = HdrRecorder(testMaxPacketSize, 3, Scale.Unit)
var bytes = testMetricKey.length
var level = 0
while (bytes <= testMaxPacketSize) {
level += 1
testRecorder.record(level)
bytes += s":$level|ms".length
}
val udp = setup(Map(testMetricName -> testRecorder.collect()))
udp.expectMsgType[Udp.Send] // let the first flush pass
val Udp.Send(data, _, _) = udp.expectMsgType[Udp.Send]
data.utf8String should be(s"$testMetricKey:$level|ms")
}
"render multiple keys in the same packet using newline as separator" in new UdpListenerFixture {
val firstTestMetricName = "first-test-metric"
val firstTestMetricKey = buildMetricKey(firstTestMetricName)
val secondTestMetricName = "second-test-metric"
val secondTestMetricKey = buildMetricKey(secondTestMetricName)
val thirdTestMetricName = "third-test-metric"
val thirdTestMetricKey = buildMetricKey(thirdTestMetricName)
val firstTestRecorder = HdrRecorder(1000L, 2, Scale.Unit)
val secondTestRecorder = HdrRecorder(1000L, 2, Scale.Unit)
val thirdTestRecorder = CounterRecorder()
firstTestRecorder.record(10L)
firstTestRecorder.record(10L)
firstTestRecorder.record(11L)
secondTestRecorder.record(20L)
secondTestRecorder.record(21L)
thirdTestRecorder.record(1L)
thirdTestRecorder.record(1L)
thirdTestRecorder.record(1L)
thirdTestRecorder.record(1L)
val udp = setup(Map(
firstTestMetricName -> firstTestRecorder.collect(),
secondTestMetricName -> secondTestRecorder.collect(),
thirdTestMetricName -> thirdTestRecorder.collect()))
val Udp.Send(data, _, _) = udp.expectMsgType[Udp.Send]
//data.utf8String should be(s"$firstTestMetricKey:10|ms|@0.5:11|ms\n$secondTestMetricKey:20|ms:21|ms\n$thirdTestMetricKey:4|c")
}
}
trait UdpListenerFixture {
val localhostName = ManagementFactory.getRuntimeMXBean.getName.split('@')(1)
val testMaxPacketSize = system.settings.config.getBytes("kamon.statsd.max-packet-size")
def buildMetricKey(metricName: String): String = s"kamon.$localhostName.test-metric-category.test-group.$metricName"
def setup(metrics: Map[String, MetricSnapshotLike]): TestProbe = {
val udp = TestProbe()
val metricsSender = system.actorOf(Props(new StatsDMetricsSender(new InetSocketAddress(localhostName, 0), testMaxPacketSize) {
override def udpExtension(implicit system: ActorSystem): ActorRef = udp.ref
}))
// Setup the SimpleSender
udp.expectMsgType[Udp.SimpleSender]
udp.reply(Udp.SimpleSenderReady)
val testGroupIdentity = new MetricGroupIdentity {
val name: String = "test-group"
val category: MetricGroupCategory = new MetricGroupCategory {
val name: String = "test-metric-category"
}
}
val testMetrics = for ((metricName, snapshot) ← metrics) yield {
val testMetricIdentity = new MetricIdentity {
val name: String = metricName
val tag: String = ""
}
(testMetricIdentity, snapshot)
}
metricsSender ! TickMetricSnapshot(0, 0, Map(testGroupIdentity -> new MetricGroupSnapshot {
val metrics: Map[MetricIdentity, MetricSnapshotLike] = testMetrics.toMap
}))
udp
}
}
}
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