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Redesign context implementation to use a `Context` type class that supports arbitrary types for the context rather than specifically `Vault`. In particular, it supports different context implementations for different backends, and parameterises several types by a `C` parameter that refers to the type of the context.
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51 changes: 51 additions & 0 deletions
51
core/common/src/main/scala/org/typelevel/otel4s/context/Context.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| /* | ||
| * 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 | ||
| package context | ||
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| trait Context[C] { outer => | ||
| type Key[A] <: context.Key[A] | ||
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| def get[A](ctx: C)(key: Key[A]): Option[A] | ||
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| def getOrElse[A](ctx: C)(key: Key[A], default: => A): A = | ||
| get(ctx)(key).getOrElse(default) | ||
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| def updated[A](ctx: C)(key: Key[A], value: A): C | ||
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| def root: C | ||
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| class Ops(ctx: C) { | ||
| def get[A](key: Key[A]): Option[A] = | ||
| outer.get(ctx)(key) | ||
| def getOrElse[A](key: Key[A], default: => A): A = | ||
| outer.getOrElse(ctx)(key, default) | ||
| def updated[A](key: Key[A], value: A): C = | ||
| outer.updated(ctx)(key, value) | ||
| } | ||
| } | ||
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| object Context { | ||
| type Keyed[C, K[_]] = Context[C] { type Key[A] = K[A] } | ||
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| def apply[C](implicit c: Context[C]): Context[C] = c | ||
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| object Implicits { | ||
| implicit def mkOps[C](ctx: C)(implicit c: Context[C]): c.Ops = | ||
| new c.Ops(ctx) | ||
| } | ||
| } |
32 changes: 32 additions & 0 deletions
32
core/common/src/main/scala/org/typelevel/otel4s/context/Key.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| /* | ||
| * 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.context | ||
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| trait Key[A] { | ||
| val name: String | ||
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| override def toString: String = s"Key($name)" | ||
| } | ||
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| object Key { | ||
| trait Provider[F[_], K[_]] { | ||
| def uniqueKey[A](name: String): F[K[A]] | ||
| } | ||
| object Provider { | ||
| def apply[F[_], K[_]](implicit p: Provider[F, K]): Provider[F, K] = p | ||
| } | ||
| } |
62 changes: 62 additions & 0 deletions
62
core/common/src/main/scala/org/typelevel/otel4s/context/vault/VaultContext.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| /* | ||
| * 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 | ||
| package context | ||
| package vault | ||
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| import cats.Functor | ||
| import cats.effect.Unique | ||
| import cats.syntax.functor._ | ||
| import org.typelevel.vault.{Key => VaultKey} | ||
| import org.typelevel.vault.Vault | ||
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| final case class VaultContext(vault: Vault) { | ||
| def get[A](key: VaultContext.Key[A]): Option[A] = | ||
| vault.lookup(key.underlying) | ||
| def getOrElse[A](key: VaultContext.Key[A], default: => A): A = | ||
| get(key).getOrElse(default) | ||
| def updated[A](key: VaultContext.Key[A], value: A): VaultContext = | ||
| VaultContext(vault.insert(key.underlying, value)) | ||
| } | ||
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| object VaultContext extends (Vault => VaultContext) { | ||
| final class Key[A] private ( | ||
| val name: String, | ||
| private[VaultContext] val underlying: VaultKey[A] | ||
| ) extends context.Key[A] | ||
| object Key { | ||
| def unique[F[_]: Functor: Unique, A](name: String): F[Key[A]] = | ||
| VaultKey.newKey[F, A].map(new Key[A](name, _)) | ||
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| implicit def provider[F[_]: Functor: Unique]: context.Key.Provider[F, Key] = | ||
| new context.Key.Provider[F, Key] { | ||
| def uniqueKey[A](name: String): F[Key[A]] = unique(name) | ||
| } | ||
| } | ||
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| val root: VaultContext = apply(Vault.empty) | ||
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| implicit object Ctx extends Context[VaultContext] { | ||
| type Key[A] = VaultContext.Key[A] | ||
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| def get[A](ctx: VaultContext)(key: Key[A]): Option[A] = | ||
| ctx.get(key) | ||
| def updated[A](ctx: VaultContext)(key: Key[A], value: A): VaultContext = | ||
| ctx.updated(key, value) | ||
| def root: VaultContext = VaultContext.root | ||
| } | ||
| } |
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