com.gu.play.secretrotation.Phase.scala Maven / Gradle / Ivy
package com.gu.play.secretrotation
import java.time.Instant
import scala.collection.SortedMap
/**
* A 'phase' holds the particular set of secrets that are active/accepted for a given period of time
*/
trait Phase[T] {
val active: T
val alsoAccepted: Iterable[T]
final def onlyAcceptsActive = alsoAccepted.isEmpty
final def accepted: LazyList[T] = LazyList(active) ++ alsoAccepted
def map[S](f: T => S): Phase[S] = {
val activeS = f(active)
val alsoAcceptedS = alsoAccepted.map(f)
new Phase[S] {
val active: S = activeS
val alsoAccepted = alsoAcceptedS
}
}
}
/**
* From hitting a datastore, we can determine a sequence of
* [[Phase]]s, with their start and stop times.
*
* So for any given state, there is a phase schedule.
*/
case class PhaseSchedule[T](initialPhase: Phase[T], phaseStarts: (Instant, Phase[T])*) {
val phasesByStart = SortedMap(phaseStarts: _*)
def phaseAt(instant: Instant): Phase[T] =
phasesByStart.rangeUntil(instant).values.lastOption.getOrElse(initialPhase)
}