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CatsResource.scala
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CatsResource.scala
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/*
* Copyright 2020 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.
*/
package cats.effect.testing
package scalatest
import cats.effect.{Async, Deferred, Resource, Sync}
import cats.syntax.all._
import org.scalatest.{BeforeAndAfterAll, FixtureAsyncTestSuite, FutureOutcome, Outcome}
import scala.concurrent.duration._
trait CatsResource[F[_], A] extends BeforeAndAfterAll { this: FixtureAsyncTestSuite =>
def ResourceAsync: Async[F]
private[this] implicit def _ResourceAsync: Async[F] = ResourceAsync
def ResourceUnsafeRun: UnsafeRun[F]
private[this] implicit def _ResourceUnsafeRun: UnsafeRun[F] = ResourceUnsafeRun
val resource: Resource[F, A]
protected val ResourceTimeout: Duration = 10.seconds
protected def finiteResourceTimeout: Option[FiniteDuration] =
Some(ResourceTimeout) collect {
case fd: FiniteDuration => fd
}
// we use the gate to prevent further step execution
// this isn't *ideal* because we'd really like to block the specs from even starting
// but it does work on scalajs
@volatile
private var gate: Option[Deferred[F, Unit]] = None
@volatile
private var value: Option[A] = None
@volatile
private var shutdown: F[Unit] = ().pure[F]
override def beforeAll(): Unit = {
val toRun = for {
d <- Deferred[F, Unit]
_ <- Sync[F] delay {
gate = Some(d)
}
pair <- resource.allocated
(a, shutdownAction) = pair
_ <- Sync[F] delay {
value = Some(a)
shutdown = shutdownAction
}
_ <- d.complete(())
} yield ()
UnsafeRun[F].unsafeToFuture(toRun, finiteResourceTimeout)
()
}
override def afterAll(): Unit = {
UnsafeRun[F].unsafeToFuture(shutdown, finiteResourceTimeout)
gate = None
value = None
shutdown = ().pure[F]
}
override type FixtureParam = A
override def withFixture(test: OneArgAsyncTest): FutureOutcome = {
lazy val toRun: F[Outcome] = Sync[F] defer {
gate match {
case Some(g) =>
g.get *> (Async[F] fromFuture {
Sync[F] delay {
withFixture(test.toNoArgAsyncTest(value.getOrElse {
fail("Resource Not Initialized When Trying to Use")
})).toFuture
}
})
case None =>
// just... loop I guess? sometimes we can hit this before scalatest has run the earlier action
toRun
}
}
new FutureOutcome(UnsafeRun[F].unsafeToFuture(toRun, finiteResourceTimeout))
}
}