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CachedTokenProvider.scala
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CachedTokenProvider.scala
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/*
* Copyright 2018 Permutive
*
* 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 com.permutive.pubsub.http.oauth
import cats.effect.kernel.{Resource, Temporal}
import com.permutive.pubsub.http.util.RefCache
import java.util.concurrent.TimeUnit
import scala.concurrent.duration.FiniteDuration
object CachedTokenProvider {
/**
* Generate a cached token provider from an underlying provider.
*
* @param underlying the underlying token provider to use when a new token is required
* @param safetyPeriod how much time less than the indicated expiry to cache a token for; this is to give a
* safety buffer to ensure an expired token is never used in a request
* @param backgroundFailureHook hook called if the background fiber refreshing the token fails
* @param onNewToken a callback invoked whenever a new token is generated, the [[scala.concurrent.duration.FiniteDuration]]
* is the period that will be waited before the next new token
*/
def resource[F[_]: Temporal](
underlying: TokenProvider[F],
safetyPeriod: FiniteDuration,
backgroundFailureHook: PartialFunction[Throwable, F[Unit]],
onNewToken: Option[(AccessToken, FiniteDuration) => F[Unit]] = None,
): Resource[F, TokenProvider[F]] = {
val cacheDuration: AccessToken => FiniteDuration = token =>
// GCP access token lifetimes are specified in seconds.
// If this is a negative amount then the sleep in `RefCache` will be for no time, it will not error.
FiniteDuration(token.expiresIn.toLong, TimeUnit.SECONDS) - safetyPeriod
RefCache
.resource(underlying.accessToken, cacheDuration, backgroundFailureHook, onNewValue = onNewToken)
.map(TokenProvider.instance)
}
}