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package kamon.statsd
import java.lang.management.ManagementFactory
import com.typesafe.config.Config
import kamon.metric.UserMetrics.UserMetricGroup
import kamon.metric.{ MetricIdentity, MetricGroupIdentity }
class SimpleMetricKeyGenerator(config: Config) extends StatsD.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(groupIdentity: MetricGroupIdentity, metricIdentity: MetricIdentity): String = {
val normalizedGroupName = normalizer(groupIdentity.name)
val key = s"${baseName}.${groupIdentity.category.name}.${normalizedGroupName}"
if (isUserMetric(groupIdentity)) key
else s"${key}.${metricIdentity.name}"
}
def isUserMetric(groupIdentity: MetricGroupIdentity): Boolean = groupIdentity.isInstanceOf[UserMetricGroup]
def hostName: String = ManagementFactory.getRuntimeMXBean.getName.split('@')(1)
def createNormalizer(strategy: String): Normalizer = strategy match {
case "percent-encode" ⇒ PercentEncoder.encode
case "normalize" ⇒ (s: String) ⇒ s.replace(": ", "-").replace(" ", "_").replace("/", "_").replace(".", "_")
}
}
object PercentEncoder {
def encode(originalString: String): String = {
val encodedString = new StringBuilder()
for (character ← originalString) {
if (shouldEncode(character)) {
encodedString.append('%')
val charHexValue = Integer.toHexString(character).toUpperCase
if (charHexValue.length < 2)
encodedString.append('0')
encodedString.append(charHexValue)
} else {
encodedString.append(character)
}
}
encodedString.toString()
}
def shouldEncode(ch: Char): Boolean = {
if (ch > 128 || ch < 0) true
else " %$&+,./:;=?@<>#%".indexOf(ch) >= 0;
}
}
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