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package mill.eval
import ammonite.ops._
import ammonite.runtime.SpecialClassLoader
import mill.define.{Graph, Target, Task}
import mill.discover.Mirror
import mill.discover.Mirror.LabelledTarget
import mill.discover.Mirror.Segment.{Cross, Label}
import mill.util
import mill.util._
import scala.collection.mutable
class Evaluator(workspacePath: Path,
labeling: Map[Target[_], LabelledTarget[_]],
log: Logger,
sel: List[Mirror.Segment] = List()){
def evaluate(goals: OSet[Task[_]]): Evaluator.Results = {
mkdir(workspacePath)
val transitive = Graph.transitiveTargets(goals)
val topoSorted = Graph.topoSorted(transitive)
val sortedGroups = Graph.groupAroundImportantTargets(topoSorted){
case t: Target[_] if labeling.contains(t) || goals.contains(t) => Right(labeling(t))
case t if goals.contains(t) => Left(t)
}
val evaluated = new OSet.Mutable[Task[_]]
val results = mutable.LinkedHashMap.empty[Task[_], Result[Any]]
for ((terminal, group)<- sortedGroups.items()){
val (newResults, newEvaluated) = evaluateGroupCached(
terminal,
group,
results
)
for(ev <- newEvaluated){
evaluated.append(ev)
}
for((k, v) <- newResults) results.put(k, v)
}
val failing = new util.MultiBiMap.Mutable[Either[Task[_], LabelledTarget[_]], Result.Failing]
for((k, vs) <- sortedGroups.items()){
failing.addAll(k, vs.items.flatMap(results.get).collect{case f: Result.Failing => f})
}
Evaluator.Results(goals.indexed.map(results), evaluated, transitive, failing)
}
def resolveDestPaths(t: LabelledTarget[_]): (Path, Path) = {
val segmentStrings = t.segments.flatMap{
case Mirror.Segment.Label(s) => Seq(s)
case Mirror.Segment.Cross(values) => values.map(_.toString)
}
val targetDestPath = workspacePath / segmentStrings
val metadataPath = targetDestPath / up / (targetDestPath.last + ".mill.json")
(targetDestPath, metadataPath)
}
def evaluateGroupCached(terminal: Either[Task[_], LabelledTarget[_]],
group: OSet[Task[_]],
results: collection.Map[Task[_], Result[Any]]): (collection.Map[Task[_], Result[Any]], Seq[Task[_]]) = {
val externalInputs = group.items.flatMap(_.inputs).filter(!group.contains(_))
// check if the build itself has changed
val classLoaderSig = Thread.currentThread().getContextClassLoader match {
case scl: SpecialClassLoader => scl.classpathSignature
case _ => Nil
}
val inputsHash =
externalInputs.map(results).toVector.hashCode +
group.toIterator.map(_.sideHash).toVector.hashCode() +
classLoaderSig.hashCode()
terminal match{
case Left(task) =>
evaluateGroup(group, results, targetDestPath = None, maybeTargetLabel = None)
case Right(labelledTarget) =>
val (destPath, metadataPath) = resolveDestPaths(labelledTarget)
val cached = for{
json <- scala.util.Try(upickle.json.read(read(metadataPath))).toOption
(cachedHash, terminalResult) <- scala.util.Try(upickle.default.readJs[(Int, upickle.Js.Value)](json)).toOption
if cachedHash == inputsHash
} yield terminalResult
cached match{
case Some(terminalResult) =>
val newResults = mutable.LinkedHashMap.empty[Task[_], Result[Any]]
newResults(labelledTarget.target) = labelledTarget.format.read(terminalResult)
(newResults, Nil)
case _ =>
val Seq(first, rest @_*) = labelledTarget.segments
val msgParts = Seq(first.asInstanceOf[Mirror.Segment.Label].value) ++ rest.map{
case Mirror.Segment.Label(s) => "." + s
case Mirror.Segment.Cross(s) => "[" + s.mkString(",") + "]"
}
if (labelledTarget.target.flushDest) rm(destPath)
val (newResults, newEvaluated) = evaluateGroup(
group,
results,
Some(destPath),
maybeTargetLabel = Some(msgParts.mkString))
newResults(labelledTarget.target) match{
case Result.Success(v) =>
val terminalResult = labelledTarget
.format
.asInstanceOf[upickle.default.ReadWriter[Any]]
.write(v)
write.over(metadataPath, upickle.default.write(inputsHash -> terminalResult, indent = 4))
case _ =>
// Wipe out any cached metadata.mill.json file that exists, so
// a following run won't look at the cached metadata file and
// assume it's associated with the possibly-borked state of the
// destPath after an evaluation failure.
rm(metadataPath)
}
(newResults, newEvaluated)
}
}
}
def evaluateGroup(group: OSet[Task[_]],
results: collection.Map[Task[_], Result[Any]],
targetDestPath: Option[Path],
maybeTargetLabel: Option[String]) = {
val newEvaluated = mutable.Buffer.empty[Task[_]]
val newResults = mutable.LinkedHashMap.empty[Task[_], Result[Any]]
val nonEvaluatedTargets = group.indexed.filterNot(results.contains)
maybeTargetLabel.foreach { targetLabel =>
val inputResults = for {
target <- nonEvaluatedTargets
item <- target.inputs.filterNot(group.contains)
} yield results(item)
val logRun = inputResults.forall(_.isInstanceOf[Result.Success[_]])
if(logRun) { log.info("Running " + targetLabel) }
}
val multiLogger = resolveLogger(targetDestPath)
for (target <- nonEvaluatedTargets) {
newEvaluated.append(target)
val targetInputValues = target.inputs
.map(x => newResults.getOrElse(x, results(x)))
.collect{ case Result.Success(v) => v }
val res =
if (targetInputValues.length != target.inputs.length) Result.Skipped
else {
val args = new Ctx(
targetInputValues.toArray[Any],
targetDestPath.orNull,
multiLogger
)
val out = System.out
val err = System.err
try{
System.setErr(multiLogger.outputStream)
System.setOut(multiLogger.outputStream)
Console.withOut(multiLogger.outputStream){
Console.withErr(multiLogger.outputStream){
target.evaluate(args)
}
}
}finally{
System.setErr(err)
System.setOut(out)
}
}
newResults(target) = res
}
multiLogger.close()
(newResults, newEvaluated)
}
def resolveLogger(targetDestPath: Option[Path]): Logger = {
if (targetDestPath.isEmpty && sel.isEmpty)
log
else {
val path = targetDestPath.getOrElse(
sel.foldLeft[Path](pwd / 'out) {
case (d, Label(s)) => d / s
case (d, Cross(args)) => d / args.map(_.toString)
}
)
val dir = path / up
mkdir(dir)
val file = dir / (path.last + ".log")
rm(file)
MultiLogger(log, FileLogger(file))
}
}
}
object Evaluator{
case class Results(rawValues: Seq[Result[Any]],
evaluated: OSet[Task[_]],
transitive: OSet[Task[_]],
failing: MultiBiMap[Either[Task[_], LabelledTarget[_]], Result.Failing]){
def values = rawValues.collect{case Result.Success(v) => v}
}
}
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