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Add a variant of Trace.ioTrace that takes an existing IOLocal #1061

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Add a variant of Trace.ioTrace that takes an existing IOLocal #1061

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78 changes: 39 additions & 39 deletions modules/core/shared/src/main/scala/Trace.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -66,51 +66,51 @@ object Trace {

/** A `Trace` instance that uses `IOLocal` internally. */
def ioTrace(rootSpan: Span[IO]): IO[Trace[IO]] =
IOLocal(rootSpan).map { local =>
new Trace[IO] {

override def put(fields: (String, TraceValue)*): IO[Unit] =
local.get.flatMap(_.put(fields: _*))

override def attachError(err: Throwable, fields: (String, TraceValue)*): IO[Unit] =
local.get.flatMap(_.attachError(err, fields: _*))

override def log(fields: (String, TraceValue)*): IO[Unit] =
local.get.flatMap(_.log(fields: _*))

override def log(event: String): IO[Unit] =
local.get.flatMap(_.log(event))

override def kernel: IO[Kernel] =
local.get.flatMap(_.kernel)

override def spanR(name: String, options: Span.Options): Resource[IO, IO ~> IO] =
for {
parent <- Resource.eval(local.get)
child <- parent.span(name, options)
} yield new (IO ~> IO) {
def apply[A](fa: IO[A]): IO[A] =
local.get.flatMap { old =>
local
.set(child)
.bracket(_ => fa.onError { case e => child.attachError(e) })(_ => local.set(old))
}
IOLocal(rootSpan).map(ioTraceLocal)

}
def ioTraceLocal(local: IOLocal[Span[IO]]): Trace[IO] = new Trace[IO] {

override def span[A](name: String, options: Span.Options)(k: IO[A]): IO[A] =
spanR(name, options).use(_(k))
override def put(fields: (String, TraceValue)*): IO[Unit] =
local.get.flatMap(_.put(fields: _*))

override def attachError(err: Throwable, fields: (String, TraceValue)*): IO[Unit] =
local.get.flatMap(_.attachError(err, fields: _*))

override def traceId: IO[Option[String]] =
local.get.flatMap(_.traceId)
override def log(fields: (String, TraceValue)*): IO[Unit] =
local.get.flatMap(_.log(fields: _*))

override def spanId(implicit F: Applicative[IO]): IO[Option[String]] =
local.get.flatMap(_.spanId)
override def log(event: String): IO[Unit] =
local.get.flatMap(_.log(event))

override def kernel: IO[Kernel] =
local.get.flatMap(_.kernel)

override def spanR(name: String, options: Span.Options): Resource[IO, IO ~> IO] =
for {
parent <- Resource.eval(local.get)
child <- parent.span(name, options)
} yield new (IO ~> IO) {
def apply[A](fa: IO[A]): IO[A] =
local.get.flatMap { old =>
local
.set(child)
.bracket(_ => fa.onError { case e => child.attachError(e) })(_ => local.set(old))
}

override def traceUri: IO[Option[URI]] =
local.get.flatMap(_.traceUri)
}
}

override def span[A](name: String, options: Span.Options)(k: IO[A]): IO[A] =
spanR(name, options).use(_(k))

override def traceId: IO[Option[String]] =
local.get.flatMap(_.traceId)

override def spanId(implicit F: Applicative[IO]): IO[Option[String]] =
local.get.flatMap(_.spanId)

override def traceUri: IO[Option[URI]] =
local.get.flatMap(_.traceUri)
}

/** A `Trace` instance that uses `IOLocal` internally. Span creation delegates to the supplied entry point. */
def ioTraceForEntryPoint(ep: EntryPoint[IO]): IO[Trace[IO]] =
Expand Down