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Finish implementing
IOLocalContextStorage
Finish implementing `IOLocalContextStorage` and `IOLocalContextStorageProvider` for sharing context modifications between Java and Scala instrumentation.
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...mmon/src/main/resources/META-INF/services/io.opentelemetry.context.ContextStorageProvider
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java/common/src/main/scala/org/typelevel/otel4s/java/IOLocalContextStorage.scala
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...rage/src/main/resources/META-INF/services/io.opentelemetry.context.ContextStorageProvider
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| org.typelevel.otel4s.java.IOLocalContextStorageProvider |
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java/context-storage/src/main/scala/org/typelevel/otel4s/java/IOLocalContextStorage.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. | ||
| */ | ||
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| package org.typelevel.otel4s.java | ||
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| import cats.effect.IOLocal | ||
| import cats.effect.LiftIO | ||
| import cats.effect.MonadCancelThrow | ||
| import cats.effect.unsafe.IOLocals | ||
| import io.opentelemetry.context.{Context => JContext} | ||
| import io.opentelemetry.context.ContextStorage | ||
| import io.opentelemetry.context.Scope | ||
| import org.typelevel.otel4s.java.context.Context | ||
| import org.typelevel.otel4s.java.context.LocalContext | ||
| import org.typelevel.otel4s.java.instances._ | ||
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| /** A `ContextStorage` backed by an [[cats.effect.IOLocal `IOLocal`]] of a | ||
| * [[`Context`]] that also provides [[cats.mtl.Local `Local`]] instances that | ||
| * reflect the state of the backing `IOLocal`. Usage of `Local` and | ||
| * `ContextStorage` methods will be consistent and stay in sync as long as | ||
| * effects are threaded properly. | ||
| */ | ||
| class IOLocalContextStorage(_ioLocal: () => IOLocal[Context]) | ||
| extends ContextStorage { | ||
| private[this] implicit lazy val ioLocal: IOLocal[Context] = _ioLocal() | ||
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| @inline private[this] def unsafeCurrent: Context = | ||
| IOLocals.get(ioLocal) | ||
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| override def attach(toAttach: JContext): Scope = { | ||
| val previous = unsafeCurrent | ||
| IOLocals.set(ioLocal, Context.wrap(toAttach)) | ||
| () => IOLocals.set(ioLocal, previous) | ||
| } | ||
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| override def current(): JContext = | ||
| unsafeCurrent.underlying | ||
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| /** @return | ||
| * a [[cats.mtl.Local `Local`]] of a [[`Context`]] that reflects the state | ||
| * of the backing `IOLocal` | ||
| */ | ||
| def local[F[_]: MonadCancelThrow: LiftIO]: LocalContext[F] = implicitly | ||
| } | ||
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| object IOLocalContextStorage { | ||
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| /** Returns a [[cats.mtl.Local `Local`]] of a [[`Context`]] if an | ||
| * [[`IOLocalContextStorage`]] is configured to be used as the | ||
| * `ContextStorage` for the Java otel library. | ||
| * | ||
| * Raises an exception if an [[`IOLocalContextStorage`]] is __not__ | ||
| * configured to be used as the `ContextStorage` for the Java otel library, | ||
| * or if [[cats.effect.IOLocal `IOLocal`]] propagation is not enabled. | ||
| */ | ||
| def providedLocal[F[_]: LiftIO](implicit | ||
| F: MonadCancelThrow[F] | ||
| ): F[LocalContext[F]] = | ||
| ContextStorage.get() match { | ||
| case storage: IOLocalContextStorage => | ||
| // TODO: check `IOLocals.arePropagating` instead once our dependencies | ||
| // are updated | ||
| if (java.lang.Boolean.getBoolean("cats.effect.ioLocalPropagation")) { | ||
| F.pure(storage.local) | ||
| } else { | ||
| F.raiseError( | ||
| new IllegalStateException( | ||
| "IOLocal propagation must be enabled with: -Dcats.effect.ioLocalPropagation=true" | ||
| ) | ||
| ) | ||
| } | ||
| case _ => | ||
| F.raiseError( | ||
| new IllegalStateException( | ||
| "IOLocalContextStorage is not configured for use as the ContextStorageProvider" | ||
| ) | ||
| ) | ||
| } | ||
| } |
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