1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/*
* =========================================================================================
* 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.datadog
import akka.actor.{ ActorSystem, Props, ActorRef, Actor }
import akka.io.{ Udp, IO }
import java.net.InetSocketAddress
import akka.util.ByteString
import kamon.metrics.Subscriptions.TickMetricSnapshot
import kamon.metrics.MetricSnapshot.Measurement
import kamon.metrics.InstrumentTypes.{ Counter, Gauge, Histogram, InstrumentType }
import java.text.DecimalFormat
class DatadogMetricsSender(remote: InetSocketAddress, maxPacketSizeInBytes: Long) extends Actor with UdpExtensionProvider {
import context.system
val metricKeyGenerator = new SimpleMetricKeyGenerator(context.system.settings.config)
val samplingRateFormat = new DecimalFormat()
samplingRateFormat.setMaximumFractionDigits(128) // Absurdly high, let the other end loss precision if it needs to.
udpExtension ! Udp.SimpleSender
def receive = {
case Udp.SimpleSenderReady ⇒
context.become(ready(sender))
}
def ready(udpSender: ActorRef): Receive = {
case tick: TickMetricSnapshot ⇒ writeMetricsToRemote(tick, udpSender)
}
def writeMetricsToRemote(tick: TickMetricSnapshot, udpSender: ActorRef): Unit = {
val dataBuilder = new MetricDataPacketBuilder(maxPacketSizeInBytes, udpSender, remote)
for (
(groupIdentity, groupSnapshot) ← tick.metrics;
(metricIdentity, metricSnapshot) ← groupSnapshot.metrics
) {
val key = metricKeyGenerator.generateKey(groupIdentity, metricIdentity)
for (measurement ← metricSnapshot.measurements) {
val measurementData = encodeMeasurement(measurement, metricSnapshot.instrumentType)
dataBuilder.appendMeasurement(key, measurementData)
}
}
dataBuilder.flush()
}
def encodeMeasurement(measurement: Measurement, instrumentType: InstrumentType): String = {
def processTags(tags: Seq[String]): String = {
if (tags.isEmpty) "" else {
tags.foldLeft(new StringBuilder("|#")) {
(sb, s) ⇒ if (sb.length > 2) sb ++= ","
sb ++= s
}.toString()
}
}
def dataDogDMetricFormat(value: String, metricType: String, samplingRate: Double = 1D, tags: Seq[String] = Nil): String =
value + "|" + metricType + (if (samplingRate != 1D) "|@" + samplingRateFormat.format(samplingRate) else "" + processTags(tags))
instrumentType match {
case Histogram ⇒ dataDogDMetricFormat(measurement.value.toString, "ms", (1D / measurement.count))
case Gauge ⇒ dataDogDMetricFormat(measurement.value.toString, "g")
case Counter ⇒ dataDogDMetricFormat(measurement.count.toString, "c")
}
}
}
object DatadogMetricsSender {
def props(remote: InetSocketAddress, maxPacketSize: Long): Props = Props(new DatadogMetricsSender(remote, maxPacketSize))
}
trait UdpExtensionProvider {
def udpExtension(implicit system: ActorSystem): ActorRef = IO(Udp)
}
class MetricDataPacketBuilder(maxPacketSizeInBytes: Long, udpSender: ActorRef, remote: InetSocketAddress) {
val metricSeparator = "\n"
val measurementSeparator = ":"
var lastKey = ""
var buffer = new StringBuilder()
def appendMeasurement(key: String, measurementData: String): Unit = {
val data = key + measurementSeparator + measurementData
if (fitsOnBuffer(metricSeparator + data)) {
val mSeparator = if (buffer.length > 0) metricSeparator else ""
buffer.append(mSeparator).append(data)
} else {
flushToUDP(buffer.toString())
buffer.clear()
buffer.append(data)
}
}
def fitsOnBuffer(data: String): Boolean = (buffer.length + data.length) <= maxPacketSizeInBytes
private def flushToUDP(data: String): Unit = udpSender ! Udp.Send(ByteString(data), remote)
def flush(): Unit = {
flushToUDP(buffer.toString)
buffer.clear()
}
}
|
