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Cache compilers in zinc nailgun instance
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src/scala/org/pantsbuild/zinc/compiler/CompilerCache.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| package org.pantsbuild.zinc.compiler | ||
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| import com.google.common.hash.{HashCode, Hashing} | ||
| import java.io.File | ||
| import java.nio.charset.StandardCharsets | ||
| import java.nio.file.{FileAlreadyExistsException, Files, StandardCopyOption} | ||
| import java.util.concurrent.Callable | ||
| import org.pantsbuild.zinc.cache.Cache | ||
| import org.pantsbuild.zinc.compiler.CompilerUtils.newScalaCompiler | ||
| import org.pantsbuild.zinc.compiler.InputUtils.ScalaJars | ||
| import org.pantsbuild.zinc.scalautil.ScalaUtils | ||
| import sbt.internal.inc.ZincUtil | ||
| import xsbti.compile.{ClasspathOptionsUtil, Compilers} | ||
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| class CompilerCache(limit: Int) { | ||
| val cache = Cache[HashCode, Compilers](limit) | ||
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| def make(scalaJars: ScalaJars, javaHome: Option[File], compiledBridgeJar: DigestedFile): Compilers = { | ||
| val instance = ScalaUtils.scalaInstance(scalaJars.compiler.file, scalaJars.extra.map { _.file }, scalaJars.library.file) | ||
| ZincUtil.compilers(instance, ClasspathOptionsUtil.auto, javaHome, newScalaCompiler(instance, compiledBridgeJar.file)) | ||
| } | ||
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| def get(compilerCacheDir: File, scalaJars: ScalaJars, javaHome: Option[File], compiledBridgeJar: DigestedFile): Compilers = { | ||
| val cacheKeyBuilder = Hashing.sha256().newHasher(); | ||
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| for (file <- Seq(scalaJars.compiler, scalaJars.library) ++ scalaJars.extra) { | ||
| cacheKeyBuilder.putBytes(HashCode.fromString(file.digest.fingerprintHex).asBytes) | ||
| cacheKeyBuilder.putLong(file.digest.sizeBytes) | ||
| } | ||
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| javaHome match { | ||
| case Some(file) => cacheKeyBuilder.putString(file.getCanonicalPath, StandardCharsets.UTF_8) | ||
| case None => {} | ||
| } | ||
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| val cacheKey = cacheKeyBuilder.hash() | ||
| cache.get(cacheKey, new Callable[Compilers] { def call(): Compilers = { | ||
| val versionedCompilerCacheDir = new File(compilerCacheDir, cacheKey.toString) | ||
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| val newScalaCompilerJar = CompilerCache.rename(scalaJars.compiler, versionedCompilerCacheDir, "scala-compiler") | ||
| val newScalaLibraryJar = CompilerCache.rename(scalaJars.library, versionedCompilerCacheDir, "scala-library") | ||
| val newScalaExtraJars = scalaJars.extra.map { CompilerCache.rename(_, versionedCompilerCacheDir, "scala-extra") } | ||
| val newCompiledBridgeJar = CompilerCache.rename(compiledBridgeJar, versionedCompilerCacheDir, "compiled-bridge") | ||
| if (!versionedCompilerCacheDir.exists) { | ||
| val tempVersionedCompilerCacheDir = compilerCacheDir.toPath | ||
| .resolve(s"${ cacheKey.toString }.tmp") | ||
| Files.createDirectories(tempVersionedCompilerCacheDir) | ||
| Files.copy(scalaJars.compiler.file.toPath, tempVersionedCompilerCacheDir.resolve(newScalaCompilerJar.file.getName)) | ||
| Files.copy(scalaJars.library.file.toPath, tempVersionedCompilerCacheDir.resolve(newScalaLibraryJar.file.getName)) | ||
| for ((oldExtra, newExtra) <- scalaJars.extra zip newScalaExtraJars) | ||
| Files.copy(oldExtra.file.toPath, tempVersionedCompilerCacheDir.resolve(newExtra.file.getName)) | ||
| Files.copy(compiledBridgeJar.file.toPath, tempVersionedCompilerCacheDir.resolve(newCompiledBridgeJar.file.getName)) | ||
| try { | ||
| Files.move(tempVersionedCompilerCacheDir, versionedCompilerCacheDir.toPath, StandardCopyOption.ATOMIC_MOVE) | ||
| } catch { | ||
| case _: FileAlreadyExistsException => { | ||
| // Ignore - trust that someone else atomically created the directory properly | ||
| } | ||
| } | ||
| } | ||
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| make(ScalaJars(newScalaCompilerJar, newScalaLibraryJar, newScalaExtraJars), javaHome, newCompiledBridgeJar) | ||
| }}) | ||
| } | ||
| } | ||
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| object CompilerCache { | ||
| def rename(file: DigestedFile, dir: File, namePrefix: String): DigestedFile = { | ||
| DigestedFile(new File(dir, s"${namePrefix}-${file.digest.fingerprintHex}-${file.digest.sizeBytes}.jar"), Some(file.digest)) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| package org.pantsbuild.zinc.compiler | ||
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| import com.google.common.hash.HashCode | ||
| import java.io.File | ||
| import java.nio.file.{Files, Path} | ||
| import java.security.MessageDigest | ||
| import org.pantsbuild.zinc.util.Util | ||
|
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| case class Digest(fingerprintHex: String, sizeBytes: Long) | ||
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| case class DigestedFile(file: File, private val _digest: Option[Digest] = None) extends scopt.Read[DigestedFile] { | ||
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| lazy val digest = _digest.getOrElse { DigestedFile.digest(file.toPath) } | ||
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| override def arity: Int = 1 | ||
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| override def reads: String => DigestedFile = DigestedFile.fromString | ||
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| def normalise(relativeTo: File): DigestedFile = { | ||
| DigestedFile(Util.normalise(Some(relativeTo))(file), _digest) | ||
| } | ||
| } | ||
|
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| object DigestedFile { | ||
| def digest(path: Path): Digest = { | ||
| val digest = MessageDigest.getInstance("SHA-256") | ||
| val bytes = Files.readAllBytes(path) | ||
| Digest(HashCode.fromBytes(digest.digest(bytes)).toString, bytes.size) | ||
| } | ||
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| def fromString(s: String): DigestedFile = { | ||
| s.split("=", 2) match { | ||
| case arr if arr.size == 1 => { | ||
| val file = new File(arr(0)) | ||
| DigestedFile(file, None) | ||
| } | ||
| case arr if arr.size == 2 => { | ||
| val file = new File(arr(0)) | ||
| val digest = arr(1).split("-", 2) match { | ||
| case digestParts if digestParts.size == 2 => Digest(digestParts(0), digestParts(1).toLong) | ||
| case _ => throw new RuntimeException(s"Bad digest: ${arr(1)}") | ||
| } | ||
| DigestedFile(file, Some(digest)) | ||
| } | ||
| } | ||
| } | ||
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| implicit def digestedFileRead: scopt.Read[DigestedFile] = scopt.Read.stringRead.map { DigestedFile.fromString } | ||
|
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| } |
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