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package io.crashbox.ci
import java.io.{File, OutputStream}
import scala.concurrent.Future
import scala.util.{Failure, Success}
import akka.stream.{Attributes, Outlet, SourceShape}
import akka.stream.stage.{GraphStage, GraphStageLogic, StageLogging}
class BuildSource[Env <: Environment, Id <: ExecutionId](
taskId: TaskId,
taskDef: TaskDef[Env],
executor: Executor[Env, Id],
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[Id] = 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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