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Metrics SDK: implement Prometheus exporter
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205 changes: 205 additions & 0 deletions
205
...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}_$unit" | ||
| } | ||
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| asPrometheusName(nameWithUnit) | ||
| } | ||
| } | ||
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| /** Converts an arbitrary string to Prometheus label name. | ||
| */ | ||
| def convertLabelName(label: String): Either[Throwable, String] = { | ||
| errorOnEmpty(label, "Empty string is not a valid label name").map { _ => | ||
| val (firstChar, rest) = (label.substring(0, 1), label.substring(1)) | ||
| val labelWithoutIllegalChars = | ||
| firstChar.replaceAll(LabelIllegalFirstCharRegex, Replacement) + rest.replaceAll( | ||
| LabelIllegalCharsRegex, | ||
| Replacement | ||
| ) | ||
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| asPrometheusName(labelWithoutIllegalChars) | ||
| } | ||
| } | ||
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| /** Converts OpenTelemetry unit names to Prometheus units. | ||
| */ | ||
| def convertUnitName(unit: String): Either[Throwable, String] = { | ||
| errorOnEmpty(unit, "Empty string is not a valid unit name").map { _ => | ||
| val unitWithoutBraces = if (unit.contains("{")) { | ||
| unit.replaceAll("\\{[^}]*}", "").trim() | ||
| } else { | ||
| unit | ||
| } | ||
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| UnitMapping | ||
| .getOrElse( | ||
| unitWithoutBraces, { | ||
| if (unitWithoutBraces.contains("/")) { | ||
| val Array(unitFirstPart, unitSecondPart) = unitWithoutBraces.split("/", 2).map(_.trim) | ||
| val firstPartPlural = UnitMapping.getOrElse(unitFirstPart, unitFirstPart) | ||
| val secondPartSingular = PerMapping.getOrElse(unitSecondPart, unitSecondPart) | ||
| if (firstPartPlural.isEmpty) { | ||
| refineUnitName(s"per_$secondPartSingular") | ||
| } else { | ||
| refineUnitName(s"${firstPartPlural}_per_$secondPartSingular") | ||
| } | ||
| } else { | ||
| 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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