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73 lines
3.3 KiB
Scala
73 lines
3.3 KiB
Scala
import sbt._
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import sbt.Keys._
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object SPIHelpers {
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/** A helper task that ensures consistency of SPI services definitions.
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*
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* It should be attached as a dependency to `Compile / compile / compileInputs` of a given library.
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*
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* It detects any unknown classes in the `services` definitions and forces a recompilation if needed, to ensure the
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* consistency of the definitions. Without this helper task, the incremental compiler did not detect removed service
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* classes, thus after such a class was removed, it still stayed in the SPI configuration - crashing at runtime when
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* the missing class was attempted to be instantiated. Only a `clean` allowed to regenerate the SPI configuration.
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* This was causing issues on the CI when switching between PRs that have some new SPI configurations - they were
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* leaking and crashing unrelated PRs.
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*
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* This task is created with the `std-*` Java helper libraries in mind and is aimed primarily at Java-only projects.
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* Additional tweaks may be needed to get it working for mixed Java/Scala projects, if ever needed.
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*
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* @see https://github.com/enso-org/enso/pull/8129
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*/
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def ensureSPIConsistency = Def.task {
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val log = streams.value.log
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val classDir = (Compile / compile / classDirectory).value
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val javaSourcesDir = (Compile / compile / javaSource).value
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val serviceDir = classDir / "META-INF" / "services"
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log.debug(s"Scanning $serviceDir for SPI definitions.")
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val files: Array[File] =
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if (serviceDir.exists()) IO.listFiles(serviceDir) else Array()
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files.foreach { serviceConfig =>
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log.debug(s"Processing service definitions: $serviceConfig")
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val definedClasses =
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IO.readLines(serviceConfig).map { qualifiedClassName =>
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val subPath = qualifiedClassName.replace('.', '/')
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val classFilePath = classDir / (subPath + ".class")
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val sourceFilePath = javaSourcesDir / (subPath + ".java")
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// We check existence of the source file - because at pre-compile the .class file may still be there even if the
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// source is gone - it will only get deleted _after_ the compilation takes place - but that may be too late.
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// However, we return the path to the class file - so that we will be able to delete it to trigger the
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// recompilation for _existing_ sources.
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val hasSource = sourceFilePath.exists()
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if (!hasSource) {
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log.debug(
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s"The source file [$sourceFilePath] for class [$qualifiedClassName] does not exist."
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)
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}
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(classFilePath, hasSource)
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}
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val (kept, removed) = definedClasses.partition(_._2)
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val needsForceRecompile = removed.nonEmpty
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if (needsForceRecompile) {
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val removedNames = removed.map(_._1).map(_.getName)
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val keptNames = kept.map(_._1).map(_.getName)
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log.warn(s"No Java sources detected for classes: $removedNames.")
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log.warn(
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s"Removing $serviceConfig and forcing recompilation of $keptNames " +
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s"to ensure that the SPI definition is up-to-date."
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)
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IO.delete(serviceConfig)
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kept.foreach { case (path, _) => IO.delete(path) }
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} else {
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log.debug(s"No missing classes detected in $serviceConfig.")
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}
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}
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}
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}
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