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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. | ||
| */ | ||
|
|
||
| import cats.effect.Async | ||
| import cats.effect.IO | ||
| import cats.effect.IOApp | ||
| import cats.effect.IOLocal | ||
| import cats.effect.Resource | ||
| import cats.effect.Sync | ||
| import cats.effect.std.Random | ||
| import cats.effect.syntax.temporal._ | ||
| import cats.mtl.Local | ||
| import cats.syntax.applicative._ | ||
| import cats.syntax.flatMap._ | ||
| import cats.syntax.functor._ | ||
| import io.opentelemetry.api.GlobalOpenTelemetry | ||
| import io.opentelemetry.context.{Context => JContext} | ||
| import io.opentelemetry.instrumentation.annotations.WithSpan | ||
| import org.apache.pekko.actor.ActorSystem | ||
| import org.apache.pekko.http.scaladsl.Http | ||
| import org.apache.pekko.http.scaladsl.model.HttpRequest | ||
| import org.apache.pekko.http.scaladsl.model.StatusCodes.OK | ||
| import org.apache.pekko.http.scaladsl.server.Directives._ | ||
| import org.apache.pekko.http.scaladsl.server.Route | ||
| import org.apache.pekko.util.ByteString | ||
| import org.typelevel.otel4s.Attribute | ||
| import org.typelevel.otel4s.java.OtelJava | ||
| import org.typelevel.otel4s.java.context.Context | ||
| import org.typelevel.otel4s.java.instances._ | ||
| import org.typelevel.otel4s.trace.Tracer | ||
|
|
||
| import scala.concurrent.Future | ||
| import scala.concurrent.duration._ | ||
| import scala.util.Using | ||
|
|
||
| /** This example relies on the OpenTelemetry Java agent. To make it work, add | ||
| * the following settings to your build: | ||
| * | ||
| * add `sbt-javaagent` dependency to the `plugins.sbt`: | ||
| * | ||
| * {{{ | ||
| * addSbtPlugin("com.github.sbt" % "sbt-javaagent" % "0.1.8") | ||
| * }}} | ||
| * | ||
| * update definition of a project in the `build.sbt`: | ||
| * | ||
| * {{{ | ||
| * .enablePlugins(JavaAgent) | ||
| * .settings( | ||
| * libraryDependencies ++= Seq( | ||
| * "org.typelevel" %% "otel4s-java" % "0.3.0-RC2", | ||
| * "org.apache.pekko" %% "pekko-stream" % "1.0.1", | ||
| * "org.apache.pekko" %% "pekko-http" % "1.0.0", | ||
| * "io.opentelemetry.instrumentation" % "opentelemetry-instrumentation-annotations" % "1.31.0", | ||
| * "io.opentelemetry" % "opentelemetry-exporter-otlp" % "1.31.0" % Runtime, | ||
| * "io.opentelemetry" % "opentelemetry-sdk-extension-autoconfigure" % "1.31.0" % Runtime | ||
| * ) | ||
| * run / fork := true, | ||
| * javaOptions += "-Dotel.java.global-autoconfigure.enabled=true", | ||
| * javaOptions += "-Dotel.service.name=pekko-otel4s", | ||
| * javaAgents += "io.opentelemetry.javaagent" % "opentelemetry-javaagent" % "1.31.0" % Runtime | ||
| * ) | ||
| * }}} | ||
| */ | ||
| object PekkoHttpExample extends IOApp.Simple { | ||
|
|
||
| def run: IO[Unit] = | ||
| IOLocal(Context.root).flatMap { implicit ioLocal: IOLocal[Context] => | ||
| implicit val local: Local[IO, Context] = localForIoLocal | ||
| val otelJava: OtelJava[IO] = OtelJava.local(GlobalOpenTelemetry.get()) | ||
|
|
||
| otelJava.tracerProvider.get("com.example").flatMap { | ||
| implicit tracer: Tracer[IO] => | ||
| createSystem.use { implicit actorSystem: ActorSystem => | ||
| def bind: Future[Http.ServerBinding] = | ||
| Http().newServerAt("127.0.0.1", 9000).bindFlow(routes) | ||
|
|
||
| Resource | ||
| .make(IO.fromFuture(IO.delay(bind))) { b => | ||
| IO.fromFuture(IO.delay(b.unbind())).void | ||
| } | ||
| .use(_ => IO.never) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private def createSystem: Resource[IO, ActorSystem] = | ||
| Resource.make(IO.delay(ActorSystem()))(system => | ||
| IO.fromFuture(IO.delay(system.terminate())).void | ||
| ) | ||
|
|
||
| private def routes(implicit | ||
| T: Tracer[IO], | ||
| L: Local[IO, Context], | ||
| S: ActorSystem | ||
| ): Route = | ||
| concat( | ||
| path("gen-random-name") { | ||
| get { | ||
| complete { | ||
| OK -> generateRandomName(length = 10) | ||
| } | ||
| } | ||
| }, | ||
| path("get-ip") { | ||
| get { | ||
| complete { | ||
| OK -> getIP() | ||
| } | ||
| } | ||
| } | ||
| ) | ||
|
|
||
| @WithSpan("generate-random-name") | ||
| private def generateRandomName( | ||
| length: Int | ||
| )(implicit T: Tracer[IO], L: Local[IO, Context]): String = | ||
| withJContext(JContext.current())(generate[IO](length)) | ||
| .unsafeRunSync()(runtime) | ||
|
|
||
| @WithSpan("get-ip") | ||
| private def getIP()(implicit | ||
| T: Tracer[IO], | ||
| L: Local[IO, Context], | ||
| A: ActorSystem | ||
| ): String = | ||
| withJContext(JContext.current())(resolveIP[IO]).unsafeRunSync()(runtime) | ||
|
|
||
| private def generate[F[_]: Async: Tracer](length: Int): F[String] = | ||
| Tracer[F].span("generate", Attribute("length", length.toLong)).surround { | ||
| for { | ||
| random <- Random.scalaUtilRandom[F] | ||
| delay <- random.betweenInt(100, 2000) | ||
| chars <- random.nextAlphaNumeric | ||
| .replicateA(length) | ||
| .delayBy(delay.millis) | ||
| } yield chars.mkString | ||
| } | ||
|
|
||
| private def resolveIP[F[_]: Async: Tracer](implicit | ||
| L: Local[F, Context], | ||
| A: ActorSystem | ||
| ): F[String] = | ||
| Tracer[F].span("resolve-ip").surround { | ||
| Async[F].executionContext.flatMap { implicit ec => | ||
| Async[F].fromFuture { | ||
| useJContext[F, Future[String]] { _ => | ||
| for { | ||
| response <- Http().singleRequest( | ||
| HttpRequest(uri = "https://checkip.amazonaws.com") | ||
| ) | ||
| body <- response.entity.dataBytes | ||
| .runFold(ByteString.empty)(_ ++ _) | ||
| } yield new String(body.toArray) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private def withJContext[F[_], A](ctx: JContext)(fa: F[A])(implicit | ||
| L: Local[F, Context] | ||
| ): F[A] = | ||
| Local[F, Context].scope(fa)(Context.wrap(ctx)) | ||
|
|
||
| private def useJContext[F[_]: Sync, A](use: JContext => A)(implicit | ||
| L: Local[F, Context] | ||
| ): F[A] = | ||
| Local[F, Context].ask.flatMap { ctx => | ||
| Sync[F].defer { | ||
| Sync[F].fromTry { | ||
| val jContext: JContext = ctx.underlying | ||
| Using(jContext.makeCurrent())(_ => use(jContext)) | ||
| } | ||
| } | ||
| } | ||
| } |
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