perf(abg): create JARs only when they are actually requested (#1615)

In some cases, only e.g. a POM is necessary to fetch for a given action.
Thanks to this change, no Kotlin compilation or JAR creation will happen
when requesting an artifact that doesn't require it.

Author: Vampire

jit-binding-server/src/main/kotlin/io/github/typesafegithub/workflows/jitbindingserver/Main.kt

@@ -109,10 +109,10 @@ private fun Route.artifact(
         val file = call.parameters["file"]!!
         if (file in bindingArtifacts) {
             when (val artifact = bindingArtifacts[file]) {
-                is TextArtifact -> call.respondText(artifact.data)
+                is TextArtifact -> call.respondText(text = artifact.data())
                 is JarArtifact ->
                     call.respondBytes(
-                        bytes = artifact.data,
+                        bytes = artifact.data(),
                         contentType = ContentType.parse("application/java-archive"),
                     )
 

maven-binding-builder/src/main/kotlin/io/github/typesafegithub/workflows/mavenbinding/JarBuilding.kt

@@ -22,8 +22,8 @@ import kotlin.io.path.div
 import kotlin.io.path.writeText
 
 internal data class Jars(
-    val mainJar: ByteArray,
-    val sourcesJar: ByteArray,
+    val mainJar: () -> ByteArray,
+    val sourcesJar: () -> ByteArray,
 )
 
 internal fun buildJars(
@@ -35,20 +35,28 @@ internal fun buildJars(
         generateBinding(owner = owner, name = name, version = version).also {
             if (it.isEmpty()) return null
         }
-    val (sourceFilePaths, compilationInputDir) = binding.prepareDirectoryWithSources()
 
-    val pathWithJarContents = compileBinding(sourceFilePaths = sourceFilePaths)
-    val mainJarByteArrayOutputStream = ByteArrayOutputStream()
-    mainJarByteArrayOutputStream.createZipFile(pathWithJarContents)
-    pathWithJarContents.toFile().deleteRecursively()
+    val mainJar by lazy {
+        val (sourceFilePaths, compilationInputDir) = binding.prepareDirectoryWithSources()
+        val pathWithJarContents = compileBinding(sourceFilePaths = sourceFilePaths)
+        val mainJarByteArrayOutputStream = ByteArrayOutputStream()
+        mainJarByteArrayOutputStream.createZipFile(pathWithJarContents)
+        pathWithJarContents.toFile().deleteRecursively()
+        compilationInputDir.toFile().deleteRecursively()
+        mainJarByteArrayOutputStream.toByteArray()
+    }
 
-    val sourcesJarByteArrayOutputStream = ByteArrayOutputStream()
-    sourcesJarByteArrayOutputStream.createZipFile(compilationInputDir)
-    compilationInputDir.toFile().deleteRecursively()
+    val sourcesJar by lazy {
+        val (_, compilationInputDir) = binding.prepareDirectoryWithSources()
+        val sourcesJarByteArrayOutputStream = ByteArrayOutputStream()
+        sourcesJarByteArrayOutputStream.createZipFile(compilationInputDir)
+        compilationInputDir.toFile().deleteRecursively()
+        sourcesJarByteArrayOutputStream.toByteArray()
+    }
 
     return Jars(
-        mainJar = mainJarByteArrayOutputStream.toByteArray(),
-        sourcesJar = sourcesJarByteArrayOutputStream.toByteArray(),
+        mainJar = { mainJar },
+        sourcesJar = { sourcesJar },
     )
 }
 

maven-binding-builder/src/main/kotlin/io/github/typesafegithub/workflows/mavenbinding/VersionArtifactsBuilding.kt

@@ -5,11 +5,11 @@ import io.github.typesafegithub.workflows.actionbindinggenerator.domain.ActionCo
 sealed interface Artifact
 
 data class TextArtifact(
-    val data: String,
+    val data: () -> String,
 ) : Artifact
 
 data class JarArtifact(
-    val data: ByteArray,
+    val data: () -> ByteArray,
 ) : Artifact
 
 fun ActionCoords.buildVersionArtifacts(): Map<String, Artifact>? {
@@ -18,12 +18,12 @@ fun ActionCoords.buildVersionArtifacts(): Map<String, Artifact>? {
     val module = buildModuleFile(owner = owner, name = name.replace("__", "/"), version = version)
     return mapOf(
         "$name-$version.jar" to JarArtifact(jars.mainJar),
-        "$name-$version.jar.md5" to TextArtifact(jars.mainJar.md5Checksum()),
+        "$name-$version.jar.md5" to TextArtifact { jars.mainJar().md5Checksum() },
         "$name-$version-sources.jar" to JarArtifact(jars.sourcesJar),
-        "$name-$version-sources.jar.md5" to TextArtifact(jars.sourcesJar.md5Checksum()),
-        "$name-$version.pom" to TextArtifact(pom),
-        "$name-$version.pom.md5" to TextArtifact(pom.md5Checksum()),
-        "$name-$version.module" to TextArtifact(module),
-        "$name-$version.module.md5" to TextArtifact(module.md5Checksum()),
+        "$name-$version-sources.jar.md5" to TextArtifact { jars.sourcesJar().md5Checksum() },
+        "$name-$version.pom" to TextArtifact { pom },
+        "$name-$version.pom.md5" to TextArtifact { pom.md5Checksum() },
+        "$name-$version.module" to TextArtifact { module },
+        "$name-$version.module.md5" to TextArtifact { module.md5Checksum() },
     )
 }