feat: add a Gradle task for downloading executable for Kubernetes Kind

fullstack-examples/build.gradle.kts

@@ -19,6 +19,7 @@ import com.hedera.fullstack.gradle.plugin.HelmInstallChartTask
 import com.hedera.fullstack.gradle.plugin.HelmReleaseExistsTask
 import com.hedera.fullstack.gradle.plugin.HelmTestChartTask
 import com.hedera.fullstack.gradle.plugin.HelmUninstallChartTask
+import com.hedera.fullstack.gradle.plugin.kind.release.KindArtifactTask
 
 plugins {
     id("com.hedera.fullstack.root")
@@ -72,6 +73,10 @@ tasks.register<HelmUninstallChartTask>("helmUninstallNotAChart") {
     ifExists.set(true)
 }
 
+val kindVersion = "0.20.0"
+
+tasks.register<KindArtifactTask>("kindArtifact") { version.set(kindVersion) }
+
 tasks.check {
     dependsOn("helmInstallNginxChart")
     dependsOn("helmNginxExists")

fullstack-gradle-plugin/build.gradle.kts

@@ -15,16 +15,20 @@
  */
 
 plugins {
+    `kotlin-dsl`
     id("java-gradle-plugin")
     id("com.gradle.plugin-publish") version "1.2.1"
     id("com.hedera.fullstack.root")
     id("com.hedera.fullstack.conventions")
     id("com.hedera.fullstack.maven-publish")
+    kotlin("jvm") version "1.9.10"
 }
 
 dependencies {
     api(platform("com.hedera.fullstack:fullstack-bom"))
     implementation("com.hedera.fullstack:fullstack-helm-client")
+    implementation(kotlin("stdlib-jdk8"))
+    implementation("net.swiftzer.semver:semver:1.1.2")
     testImplementation("org.assertj:assertj-core:3.24.2")
 }
 
@@ -40,3 +44,7 @@ gradlePlugin {
         }
     }
 }
+
+repositories { mavenCentral() }
+
+kotlin { jvmToolchain(17) }

fullstack-gradle-plugin/src/main/java/com/hedera/fullstack/gradle/plugin/kind/release/Architecture.kt

@@ -0,0 +1,10 @@
+package com.hedera.fullstack.gradle.plugin.kind.release
+
+enum class Architecture(val descriptor: String) {
+    AMD64("amd64"),
+    ARM64("arm64"),
+    ARM("arm"),
+    PPC64LE("ppc64le"),
+    S390X("s390x"),
+    RISCV64("riscv64");
+}

fullstack-gradle-plugin/src/main/java/com/hedera/fullstack/gradle/plugin/kind/release/ArtifactTuple.kt

@@ -0,0 +1,44 @@
+package com.hedera.fullstack.gradle.plugin.kind.release
+
+import java.io.Serializable
+
+class ArtifactTuple(
+    val operatingSystem: OperatingSystem,
+    val architecture: Architecture,
+) : Serializable {
+    companion object {
+        @JvmStatic
+        fun standardTuples(): List<ArtifactTuple> {
+            return listOf(
+                ArtifactTuple(OperatingSystem.DARWIN, Architecture.AMD64),
+                ArtifactTuple(OperatingSystem.DARWIN, Architecture.ARM64),
+                ArtifactTuple(OperatingSystem.WINDOWS, Architecture.AMD64),
+                ArtifactTuple(OperatingSystem.LINUX, Architecture.AMD64),
+                ArtifactTuple(OperatingSystem.LINUX, Architecture.ARM64),
+            )
+        }
+
+        @JvmStatic
+        fun of(operatingSystem: OperatingSystem, architecture: Architecture): ArtifactTuple {
+            return ArtifactTuple(operatingSystem, architecture)
+        }
+    }
+
+    override fun hashCode(): Int {
+        var result = operatingSystem.hashCode()
+        result = 31 * result + architecture.hashCode()
+        return result
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other !is ArtifactTuple) return false
+
+        if (operatingSystem != other.operatingSystem) return false
+        return architecture == other.architecture
+    }
+
+    override fun toString(): String {
+        return "${operatingSystem.descriptor}-${architecture.descriptor}"
+    }
+}

fullstack-gradle-plugin/src/main/java/com/hedera/fullstack/gradle/plugin/kind/release/KindArtifactTask.kt

@@ -0,0 +1,157 @@
+package com.hedera.fullstack.gradle.plugin.kind.release
+
+import net.swiftzer.semver.SemVer
+import org.gradle.api.DefaultTask
+import org.gradle.api.GradleException
+import org.gradle.api.file.DirectoryProperty
+import org.gradle.api.logging.LogLevel
+import org.gradle.api.plugins.JavaPluginExtension
+import org.gradle.api.provider.ListProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.*
+import org.gradle.kotlin.dsl.configure
+import org.gradle.kotlin.dsl.get
+import java.net.URL
+import java.nio.file.Files
+import java.nio.file.Path
+import kotlin.io.path.createDirectories
+import kotlin.io.path.exists
+
+@CacheableTask
+abstract class KindArtifactTask() : DefaultTask() {
+    @get:Input
+    val version: Property<String> = project.objects.property(String::class.java).convention("0.20.0")
+
+    @get:Input
+    val tuples: ListProperty<ArtifactTuple> = project.objects.listProperty(ArtifactTuple::class.java).convention(
+        ArtifactTuple.standardTuples()
+    )
+
+    @get:OutputDirectory
+    val output: DirectoryProperty = project.objects.directoryProperty()
+
+    private var actualVersion: SemVer? = null
+    private var actualTuples: List<ArtifactTuple>? = null
+    private var workingDirectory: Path? = null
+
+    companion object {
+        const val KIND_RELEASE_URL_TEMPLATE = "https://kind.sigs.k8s.io/dl/v%s/kind-%s-%s"
+        const val KIND_EXECUTABLE_PREFIX = "kind"
+        const val KIND_VERSION_FILE = "KIND_VERSION"
+    }
+
+    init {
+        group = "kind"
+        description = "Downloads the kind executable for the supplied operating systems and architectures"
+        project.configure<JavaPluginExtension> {
+            output.set(sourceSets["main"].resources.srcDirs.first().toPath().resolve("software").toFile())
+        }
+    }
+
+    @TaskAction
+    fun execute() {
+        validate()
+        createWorkingDirectory()
+
+        for (tuple in actualTuples!!) {
+            download(tuple)
+        }
+
+        project.logger.log(LogLevel.WARN, "Kind download output directory ${output.get().asFile.toPath()}")
+
+        writeVersionFile(output.get().asFile.toPath())
+    }
+
+    private fun validate() {
+        try {
+            actualVersion = SemVer.parse(version.get())
+        } catch (e: IllegalArgumentException) {
+            throw StopExecutionException("The supplied version is not valid: ${version.get()}")
+        }
+
+        if (!tuples.isPresent) {
+            throw StopExecutionException("No tuples were supplied")
+        }
+
+        if (tuples.get().isEmpty()) {
+            throw StopExecutionException("No tuples were supplied")
+        }
+
+        actualTuples = tuples.get()
+
+        if (!output.get().asFile.exists()) {
+            try {
+                output.get().asFile.mkdirs()
+            } catch (e: Exception) {
+                throw GradleException("Unable to create base artifact directory")
+            }
+        }
+    }
+
+    private fun createWorkingDirectory() {
+        try {
+            workingDirectory = Files.createTempDirectory("kind-artifacts")
+            workingDirectory!!.toFile().deleteOnExit()
+        } catch (e: Exception) {
+            throw StopExecutionException("Unable to create working directory")
+        }
+    }
+
+    private fun download(tuple: ArtifactTuple) {
+        val downloadUrl = String.format(
+            KIND_RELEASE_URL_TEMPLATE,
+            actualVersion!!.toString(),
+            tuple.operatingSystem.descriptor,
+            tuple.architecture.descriptor
+        )
+
+        val tempFile = workingDirectory!!.resolve(KIND_EXECUTABLE_PREFIX + tuple.operatingSystem.fileExtension)
+
+        try {
+            val url = URL(downloadUrl)
+            url.openStream().use { input ->
+                Files.newOutputStream(tempFile).use { output ->
+                    input.copyTo(output)
+                    output.flush()
+                }
+            }
+        } catch (e: Exception) {
+            throw GradleException("Unable to download artifact from: $downloadUrl to: $tempFile")
+        }
+
+        val destination =
+            output.get().asFile.toPath().resolve(tuple.operatingSystem.descriptor)
+                .resolve(tuple.architecture.descriptor)
+        copyFile(tempFile, destination)
+    }
+
+    private fun copyFile(source: Path, destination: Path) {
+        if (!destination.exists()) {
+            try {
+                destination.createDirectories()
+            } catch (e: Exception) {
+                throw GradleException("Unable to create destination directory")
+            }
+        }
+
+        try {
+            project.logger.log(LogLevel.DEBUG, "Copying ${source} to ${destination}")
+            project.copy {
+                from(source)
+                into(destination)
+                includeEmptyDirs = false
+            }
+        } catch (e: Exception) {
+            throw GradleException("Unable to write '${source}' to '${destination}'")
+        }
+    }
+
+    private fun writeVersionFile(path: Path) {
+        val versionFile = path.resolve(KIND_VERSION_FILE)
+        try {
+            Files.writeString(versionFile, actualVersion!!.toString())
+        } catch (e: Exception) {
+            throw GradleException("Unable to write version file")
+        }
+    }
+}

fullstack-gradle-plugin/src/main/java/com/hedera/fullstack/gradle/plugin/kind/release/OperatingSystem.kt

@@ -0,0 +1,7 @@
+package com.hedera.fullstack.gradle.plugin.kind.release
+
+enum class OperatingSystem(val descriptor: String, val fileExtension: String) {
+    DARWIN("darwin",  ""),
+    LINUX("linux", ""),
+    WINDOWS("windows", ".exe");
+}

fullstack-gradle-plugin/src/test/java/com/hedera/fullstack/gradle/plugin/kind/release/KindArtifactTaskTest.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2023 Hedera Hashgraph, LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hedera.fullstack.gradle.plugin.kind.release;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.File;
+import java.nio.file.Path;
+import org.gradle.api.Project;
+import org.gradle.api.file.Directory;
+import org.gradle.testfixtures.ProjectBuilder;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+public class KindArtifactTaskTest {
+    static final String OS = System.getProperty("os.name").toLowerCase();
+    static final String BIT = System.getProperty("os.arch").toLowerCase();
+
+    private static Project project;
+
+    @BeforeAll
+    static void beforeAll() {
+        project = ProjectBuilder.builder().build();
+        project.getPlugins().apply("java");
+    }
+
+    private static boolean isWindows() {
+        return (OS.contains("win"));
+    }
+
+    private static boolean isMac() {
+        return (OS.contains("mac"));
+    }
+
+    private static boolean isLinux() {
+        return (OS.contains("linux"));
+    }
+
+    private static boolean isArm64() {
+        return (BIT.contains("arm64") || BIT.contains("aarch64"));
+    }
+
+    private static boolean isAmd64() {
+        return (BIT.contains("amd64") || BIT.contains("x86_64"));
+    }
+
+    private static String getOs() {
+        if (isWindows()) {
+            return "windows";
+        } else if (isMac()) {
+            return "darwin";
+        } else if (isLinux()) {
+            return "linux";
+        } else {
+            return "unknown";
+        }
+    }
+
+    private static String getArchitecture() {
+        if (isArm64()) {
+            return "arm64";
+        } else if (isAmd64()) {
+            return "amd64";
+        } else {
+            return "unknown";
+        }
+    }
+
+    @Test
+    @DisplayName("Test kind artifact download")
+    void testKindArtifactDownload() {
+        KindArtifactTask kindArtifactTask = project.getTasks()
+                .create("kindArtifactDownloadTask", KindArtifactTask.class, task -> {
+                    task.getVersion().set("0.20.0");
+                });
+        kindArtifactTask.execute();
+        Directory directory = kindArtifactTask.getOutput().get();
+        File kindExecutable = Path.of(directory.getAsFile().getAbsolutePath())
+                .resolve(getOs())
+                .resolve(getArchitecture())
+                .resolve("kind" + (isWindows() ? ".exe" : ""))
+                .toFile();
+        assertThat(kindExecutable).exists();
+    }
+}