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package io.crashbox.ci
import akka.actor.{ Actor, ActorLogging, ActorRef, OneForOneStrategy, Props, Terminated }
import akka.stream.stage.GraphStageLogic
import akka.stream.{ Attributes, Outlet, SourceShape }
import akka.stream.stage.GraphStage
import java.io.{ File, OutputStream }
import java.net.URL
import java.nio.file.Files
import java.util.Base64
import scala.collection.mutable.HashMap
import scala.concurrent.{ Await, Future }
import scala.concurrent.duration._
import scala.util.control.NonFatal
import akka.actor.SupervisorStrategy._
import scala.util.{ Failure, Success }
trait Schedulers extends { self: Core with Source with Builders with Parsers =>
private def newTempDir: File = Files.createTempDirectory("crashbox-run").toFile()
sealed trait BuildState
case class Cloning(url: URL) extends BuildState
case class Parsing(dir: File) extends BuildState
case class Starting(dir: File, buildDef: BuildDef) extends BuildState
case class Running(id: ContainerId) extends BuildState
sealed trait EndBuildState extends BuildState
case class Finished(status: Int) extends EndBuildState
case class Failed(message: String) extends EndBuildState
class BuildManager(
url: URL,
openOut: () => OutputStream,
update: BuildState => Unit
) extends Actor with ActorLogging {
var buildDir: Option[File] = None
var out: Option[OutputStream] = None
var containerId: Option[ContainerId] = None
override def postStop() = {
containerId foreach { cancelBuild(_) }
out foreach { _.close() }
buildDir foreach { _.delete() }
}
override def preStart() = {
log.info(s"Started build manager for $url")
self ! Cloning(url)
}
override def receive: Receive = {
case state@Cloning(url) =>
log.debug("Update build state: cloning")
update(state)
fetchSource(url, newTempDir) onComplete {
case Success(dir) =>
self ! Parsing(dir)
case Failure(err) =>
self ! Failed(s"Error fetching source from $url")
}
case state@Parsing(src) =>
log.debug("Update build state: parsing")
update(state)
buildDir = Some(src)
parseBuild(src) match {
case Left(buildDef) =>
self ! Starting(src, buildDef)
case Right(err) =>
self ! Failed(s"Failed to parse build $err")
}
case state@Starting(src, bd) =>
log.debug("Update build state: starting")
update(state)
val so = openOut()
out = Some(so)
startBuild(bd.image, bd.script, src, so) onComplete {
case Success(id) =>
self ! Running(id)
case Failure(err) =>
self ! Failed(s"Failed to start build $err")
}
case state@Running(id) =>
log.debug("Update build state: running")
update(state)
containerId = Some(id)
waitBuild(id) onComplete {
case Success(status) =>
self ! Finished(status)
case Failure(err) =>
self ! Failed(s"Error waiting for build to complete")
}
case state@Finished(status) =>
log.debug("Update build state: finished")
update(state)
context stop self
case state@Failed(message) =>
log.debug("Update build state: failed")
update(state)
context stop self
}
}
object BuildManager {
def apply(buildId: String, url: URL, out: () => OutputStream, update: BuildState => Unit) =
Props(new BuildManager(url, out, update))
}
private sealed trait SchedulerCommand
private case class ScheduleBuild(
buildId: String, url: URL, out: () => OutputStream, update: BuildState => Unit
) extends SchedulerCommand
class Scheduler extends Actor {
val runningBuilds = new HashMap[String, ActorRef]
override def receive = {
case sb: ScheduleBuild =>
runningBuilds.get(sb.buildId) match {
case Some(_) => //already running
case None =>
val buildManager = context.actorOf(BuildManager(
sb.buildId, sb.url, sb.out, sb.update), s"build-${sb.buildId}")
context watch buildManager
runningBuilds += sb.buildId -> buildManager
}
case Terminated(buildManager) =>
//TODO use a more efficient data structure
runningBuilds.find(_._2 == buildManager).foreach {
runningBuilds -= _._1
}
}
}
private val scheduler = system.actorOf(Props(new Scheduler()), "crashbox-scheduler")
def start(
buildId: String,
url: URL,
out: () => OutputStream,
update: BuildState => Unit
): Unit = {
scheduler ! ScheduleBuild(buildId, url, out, update)
}
}
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