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• trace4cats-iolocal_2.13
• 0.14.7
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• IOLocalTraceInstances.scala

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trace4cats.iolocal.IOLocalTraceInstances.scala Maven / Gradle / Ivy

package trace4cats.iolocal

import cats.effect.{IO, IOLocal}
import trace4cats.Trace
import trace4cats.kernel.Span
import trace4cats.context.Local
import trace4cats.optics.Lens

trait IOLocalTraceInstances {

  /** Construct a `Trace[IO]` instance backed by the given `IOLocal[Ctx]`. */
  def ioLocalTrace[Ctx](rootCtx: IOLocal[Ctx])(implicit lens: Lens[Ctx, Span[IO]]): Trace.WithContext[IO] = {
    implicit val local: Local[IO, Span[IO]] = ioLocalProvide(rootCtx).focus(lens)
    Trace.WithContext[IO]
  }
}