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Metrics SDK: implement Prometheus exporter
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204
...eus/src/main/scala/org/typelevel/otel4s/sdk/exporter/prometheus/PrometheusConverter.scala
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/* | ||
* Copyright 2024 Typelevel | ||
* | ||
* 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. | ||
*/ | ||
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package org.typelevel.otel4s.sdk.exporter.prometheus | ||
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import scala.annotation.tailrec | ||
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private object PrometheusConverter { | ||
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private val ReservedSuffixes = List("total", "created", "bucket", "info") | ||
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private val UnitMapping = Map( | ||
// Time | ||
"a" -> "years", | ||
"mo" -> "months", | ||
"wk" -> "weeks", | ||
"d" -> "days", | ||
"h" -> "hours", | ||
"min" -> "minutes", | ||
"s" -> "seconds", | ||
"ms" -> "milliseconds", | ||
"us" -> "microseconds", | ||
"ns" -> "nanoseconds", | ||
// Bytes | ||
"By" -> "bytes", | ||
"KiBy" -> "kibibytes", | ||
"MiBy" -> "mebibytes", | ||
"GiBy" -> "gibibytes", | ||
"TiBy" -> "tibibytes", | ||
"KBy" -> "kilobytes", | ||
"MBy" -> "megabytes", | ||
"GBy" -> "gigabytes", | ||
"TBy" -> "terabytes", | ||
// SI | ||
"m" -> "meters", | ||
"V" -> "volts", | ||
"A" -> "amperes", | ||
"J" -> "joules", | ||
"W" -> "watts", | ||
"g" -> "grams", | ||
// Misc | ||
"Cel" -> "celsius", | ||
"Hz" -> "hertz", | ||
"%" -> "percent", | ||
"1" -> "ratio" | ||
) | ||
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private val PerMapping = Map( | ||
"s" -> "second", | ||
"min" -> "minute", | ||
"h" -> "hour", | ||
"d" -> "day", | ||
"wk" -> "week", | ||
"mo" -> "month", | ||
"a" -> "year" | ||
) | ||
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private val NameIllegalFirstCharRegex = "[^a-zA-Z_:.]" | ||
private val NameIllegalCharsRegex = "[^a-zA-Z0-9_:.]" | ||
private val LabelIllegalFirstCharRegex = "[^a-zA-Z_.]" | ||
private val LabelIllegalCharsRegex = "[^a-zA-Z0-9_.]" | ||
private val UnitIllegalCharsRegex = "[^a-zA-Z0-9_:.]" | ||
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private val Replacement = "_" | ||
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/** Converts an arbitrary string to Prometheus metric name. | ||
*/ | ||
def convertName(name: String): Either[Throwable, String] = { | ||
@tailrec | ||
def removeReservedSuffixes(s: String): String = { | ||
val (updatedS, modified) = ReservedSuffixes.foldLeft((s, false)) { case ((str, modified), suffix) => | ||
if (str == s"_$suffix" || str == s".$suffix") { | ||
(suffix, modified) | ||
} else if (str.endsWith(s"_$suffix") || str.endsWith(s".$suffix")) { | ||
(str.substring(0, str.length - suffix.length - 1), true) | ||
} else { | ||
(str, modified) | ||
} | ||
} | ||
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if (modified) { | ||
removeReservedSuffixes(updatedS) | ||
} else { | ||
updatedS | ||
} | ||
} | ||
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errorOnEmpty(name, "Empty string is not a valid metric name").map { _ => | ||
val (firstChar, rest) = (name.substring(0, 1), name.substring(1)) | ||
val nameWithoutIllegalChars = | ||
firstChar.replaceAll(NameIllegalFirstCharRegex, Replacement) + rest.replaceAll( | ||
NameIllegalCharsRegex, | ||
Replacement | ||
) | ||
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val nameWithoutReservedSuffixes = removeReservedSuffixes(nameWithoutIllegalChars) | ||
asPrometheusName(nameWithoutReservedSuffixes) | ||
} | ||
} | ||
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/** Converts an arbitrary string and OpenTelemetry unit to Prometheus metric name. | ||
*/ | ||
def convertName(name: String, unit: String): Either[Throwable, String] = { | ||
convertName(name).map { convertedName => | ||
val nameWithUnit = if (convertedName.endsWith(s"_$unit")) { | ||
convertedName | ||
} else { | ||
s"${convertedName}_$unit" | ||
} | ||
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asPrometheusName(nameWithUnit) | ||
} | ||
} | ||
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/** Converts an arbitrary string to Prometheus label name. | ||
*/ | ||
def convertLabelName(label: String): Either[Throwable, String] = { | ||
errorOnEmpty(label, "Empty string is not a valid label name").map { _ => | ||
val (firstChar, rest) = (label.substring(0, 1), label.substring(1)) | ||
val labelWithoutIllegalChars = | ||
firstChar.replaceAll(LabelIllegalFirstCharRegex, Replacement) + rest.replaceAll( | ||
LabelIllegalCharsRegex, | ||
Replacement | ||
) | ||
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asPrometheusName(labelWithoutIllegalChars) | ||
} | ||
} | ||
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/** Converts OpenTelemetry unit names to Prometheus units. | ||
*/ | ||
def convertUnitName(unit: String): Either[Throwable, String] = { | ||
errorOnEmpty(unit, "Empty string is not a valid unit name").map { _ => | ||
val unitWithoutBraces = if (unit.contains("{")) { | ||
unit.replaceAll("\\{[^}]*}", "").trim() | ||
} else { | ||
unit | ||
} | ||
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UnitMapping | ||
.getOrElse( | ||
unitWithoutBraces, { | ||
unitWithoutBraces.split("/", 2).map(_.trim) match { | ||
case Array(unitFirstPart, unitSecondPart) => | ||
val firstPartPlural = UnitMapping.getOrElse(unitFirstPart, unitFirstPart) | ||
val secondPartSingular = PerMapping.getOrElse(unitSecondPart, unitSecondPart) | ||
if (firstPartPlural.isEmpty) { | ||
refineUnitName(s"per_$secondPartSingular") | ||
} else { | ||
refineUnitName(s"${firstPartPlural}_per_$secondPartSingular") | ||
} | ||
case _ => refineUnitName(unitWithoutBraces) | ||
} | ||
} | ||
) | ||
} | ||
} | ||
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private def refineUnitName(unit: String): String = { | ||
def trim(s: String) = s.replaceAll("^[_.]+", "").replaceAll("[_.]+$", "") | ||
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@tailrec | ||
def removeReservedSuffixes(s: String): String = { | ||
val (updatedS, modified) = ReservedSuffixes.foldLeft((s, false)) { case ((str, modified), suffix) => | ||
if (str.endsWith(suffix)) { | ||
(trim(str.substring(0, str.length - suffix.length)), true) | ||
} else { | ||
(str, modified) | ||
} | ||
} | ||
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if (modified) { | ||
removeReservedSuffixes(updatedS) | ||
} else { | ||
updatedS | ||
} | ||
} | ||
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val unitWithoutIllegalChars = unit.replaceAll(UnitIllegalCharsRegex, Replacement) | ||
removeReservedSuffixes(trim(unitWithoutIllegalChars)) | ||
} | ||
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private def asPrometheusName(name: String): String = { | ||
name.replace(".", Replacement).replaceAll("_{2,}", Replacement) | ||
} | ||
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private def errorOnEmpty(name: String, error: String): Either[IllegalArgumentException, String] = { | ||
Either.cond(name.nonEmpty, name, new IllegalArgumentException(error)) | ||
} | ||
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} |
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