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package io.crashbox.ci
import akka.actor.{ Actor, ActorLogging, ActorRef, ActorSystem }
import akka.stream.SourceShape
import akka.stream.stage.{ GraphStageLogic, InHandler, OutHandler, StageLogging }
import akka.stream.{ Attributes, FanInShape2, Inlet, Outlet }
import akka.stream.stage.{ GraphStage }
import java.io.{ File, OutputStream }
import java.util.concurrent.atomic.AtomicInteger
import scala.collection.concurrent.TrieMap
import scala.collection.mutable.{ HashMap, Queue }
import scala.concurrent.Future
import scala.util.{ Failure, Success }
case class BuildId(id: String) extends AnyVal
case class TaskId(buildId: String, taskIdx: Int) {
override def toString = s"$buildId#$taskIdx"
}
class BuildSource[E <: Environment](
taskId: TaskId,
taskDef: TaskDef[E],
executor: Executor[E],
mkdir: => File,
mkout: => OutputStream // TODO refactor this into a two-output stage
) extends GraphStage[SourceShape[Builder.BuildState]] {
import Builder._
val states = Outlet[BuildState]("Builder.states")
val shape = new SourceShape(states)
def createLogic(attributes: Attributes) = new GraphStageLogic(shape) with StageLogging {
implicit def ec = materializer.executionContext
lazy val instance: Future[ExecutionId] = executor.start(
taskDef.environment,
taskDef.script,
mkdir,
mkout
)
val changeState = getAsyncCallback[BuildState]{state =>
log.info(s"${state.taskId} transitioned to $state")
emit(states, state)
}
val asyncClose = getAsyncCallback[Unit]{_ =>
completeStage()
}
override def preStart() = {
val pipeline = for (
_ <- Future.unit;
_ = changeState.invoke(TaskStarting(taskId, taskDef));
eid <- instance;
_ = changeState.invoke(TaskRunning(taskId, eid));
status <- executor.result(eid)
) yield status
pipeline onComplete { result =>
result match {
case Success(status) =>
changeState.invoke(TaskFinished(taskId, status))
case Failure(err) =>
changeState.invoke(TaskFailed(taskId, err.toString))
}
asyncClose.invoke(())
}
}
override def postStop() = {
instance.foreach{ eid => executor.stop(eid)}
}
setHandler(states, GraphStageLogic.IgnoreTerminateOutput)
}
}
object Builder {
sealed trait BuildState {
def taskId: TaskId
}
case class TaskStarting(taskId: TaskId, taskDef: TaskDef[Environment]) extends BuildState
case class TaskRunning(taskId: TaskId, execId: ExecutionId) extends BuildState
case class TaskFinished(taskId: TaskId, status: Int) extends BuildState
case class TaskFailed(taskId: TaskId, message: String) extends BuildState
}
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