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SpanFinalizer.scala
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SpanFinalizer.scala
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/*
* Copyright 2022 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.
*/
package org.typelevel.otel4s
package trace
import cats.Applicative
import cats.Semigroup
import cats.data.NonEmptyList
import cats.effect.kernel.Resource
import cats.syntax.applicative._
import cats.syntax.foldable._
import cats.syntax.semigroup._
import scala.collection.immutable
sealed trait SpanFinalizer
object SpanFinalizer {
type Strategy = PartialFunction[Resource.ExitCase, SpanFinalizer]
object Strategy {
def empty: Strategy = PartialFunction.empty
def reportAbnormal: Strategy = {
case Resource.ExitCase.Errored(e) =>
recordException(e) |+| setStatus(StatusCode.Error)
case Resource.ExitCase.Canceled =>
setStatus(StatusCode.Error, "canceled")
}
}
final class RecordException private[SpanFinalizer] (
val throwable: Throwable
) extends SpanFinalizer
final class SetStatus private[SpanFinalizer] (
val status: StatusCode,
val description: Option[String]
) extends SpanFinalizer
final class AddAttributes private[SpanFinalizer] (
val attributes: Attributes
) extends SpanFinalizer
final class Multiple private[SpanFinalizer] (
val finalizers: NonEmptyList[SpanFinalizer]
) extends SpanFinalizer
def recordException(throwable: Throwable): SpanFinalizer =
new RecordException(throwable)
def setStatus(status: StatusCode): SpanFinalizer =
new SetStatus(status, None)
def setStatus(status: StatusCode, description: String): SpanFinalizer =
new SetStatus(status, Some(description))
def addAttribute[A](attribute: Attribute[A]): SpanFinalizer =
new AddAttributes(Attributes(attribute))
def addAttributes(attributes: Attribute[_]*): SpanFinalizer =
addAttributes(attributes)
def addAttributes(
attributes: immutable.Iterable[Attribute[_]]
): SpanFinalizer =
new AddAttributes(attributes.to(Attributes))
def multiple(head: SpanFinalizer, tail: SpanFinalizer*): Multiple =
new Multiple(NonEmptyList.of(head, tail: _*))
implicit val spanFinalizerSemigroup: Semigroup[SpanFinalizer] = {
case (left: Multiple, right: Multiple) =>
new Multiple(left.finalizers.concatNel(right.finalizers))
case (left: Multiple, right: SpanFinalizer) =>
new Multiple(left.finalizers.append(right))
case (left: SpanFinalizer, right: Multiple) =>
new Multiple(right.finalizers.prepend(left))
case (left, right) =>
new Multiple(NonEmptyList.of(left, right))
}
private[otel4s] def run[F[_]: Applicative](
backend: Span.Backend[F],
finalizer: SpanFinalizer
): F[Unit] = {
def loop(input: SpanFinalizer): F[Unit] =
input match {
case r: RecordException =>
backend.recordException(r.throwable, Attributes.empty)
case s: SetStatus =>
s.description match {
case Some(desc) => backend.setStatus(s.status, desc)
case None => backend.setStatus(s.status)
}
case s: AddAttributes =>
backend.addAttributes(s.attributes)
case m: Multiple =>
m.finalizers.traverse_(strategy => loop(strategy))
}
loop(finalizer).whenA(backend.meta.isEnabled)
}
}