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AsyncPlatform.scala
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AsyncPlatform.scala
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/*
* Copyright 2020-2022 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.
*/
package cats.effect.kernel
import scala.scalajs.js.{|, defined, Function1, JavaScriptException, Promise, Thenable}
private[kernel] trait AsyncPlatform[F[_]] { this: Async[F] =>
def fromPromise[A](iop: F[Promise[A]]): F[A] = fromThenable(widen(iop))
def fromThenable[A](iot: F[Thenable[A]]): F[A] =
flatMap(iot) { t =>
async_[A] { cb =>
val onFulfilled: Function1[A, Unit | Thenable[Unit]] =
(v: A) => cb(Right(v)): Unit | Thenable[Unit]
val onRejected: Function1[Any, Unit | Thenable[Unit]] = { (a: Any) =>
val e = a match {
case th: Throwable => th
case _ => JavaScriptException(a)
}
cb(Left(e)): Unit | Thenable[Unit]
}
t.`then`[Unit](onFulfilled, defined(onRejected))
()
}
}
}