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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.lang.management.ManagementFactory
import com.typesafe.config.Config
import kamon.metric.{ SingleInstrumentEntityRecorder, MetricKey, Entity }
trait MetricKeyGenerator {
def generateKey(entity: Entity, metricKey: MetricKey): String
}
class SimpleMetricKeyGenerator(config: Config) extends MetricKeyGenerator {
type Normalizer = String ⇒ String
val configSettings = config.getConfig("kamon.statsd.simple-metric-key-generator")
val application = configSettings.getString("application")
val includeHostname = configSettings.getBoolean("include-hostname")
val hostnameOverride = configSettings.getString("hostname-override")
val normalizer = createNormalizer(configSettings.getString("metric-name-normalization-strategy"))
val normalizedHostname =
if (hostnameOverride.equals("none")) normalizer(hostName)
else normalizer(hostnameOverride)
val baseName: String =
if (includeHostname) s"$application.$normalizedHostname"
else application
def generateKey(entity: Entity, metricKey: MetricKey): String = entity.category match {
case "trace-segment" ⇒
s"${baseName}.trace.${normalizer(entity.tags("trace"))}.segments.${normalizer(entity.name)}.${metricKey.name}"
case _ if SingleInstrumentEntityRecorder.AllCategories.contains(entity.category) ⇒
s"${baseName}.${entity.category}.${normalizer(entity.name)}"
case _ ⇒
s"${baseName}.${entity.category}.${normalizer(entity.name)}.${metricKey.name}"
}
def hostName: String = ManagementFactory.getRuntimeMXBean.getName.split('@')(1)
def createNormalizer(strategy: String): Normalizer = strategy match {
case "percent-encode" ⇒ PercentEncoder.encode
case "normalize" ⇒ (s: String) ⇒ s.replace(":", "-").replace(" ", "_").replace("/", "_").replace(".", "_")
}
}
object PercentEncoder {
def encode(originalString: String): String = {
val encodedString = new StringBuilder()
for (character ← originalString) {
if (shouldEncode(character)) {
encodedString.append('%')
val charHexValue = Integer.toHexString(character).toUpperCase
if (charHexValue.length < 2)
encodedString.append('0')
encodedString.append(charHexValue)
} else {
encodedString.append(character)
}
}
encodedString.toString()
}
def shouldEncode(ch: Char): Boolean = {
if (ch > 128 || ch < 0) true
else " %$&+,./:;=?@<>#%".indexOf(ch) >= 0;
}
}
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