build.gradle.kts

import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
import com.github.jk1.license.filter.LicenseBundleNormalizer
import com.github.jk1.license.render.InventoryMarkdownReportRenderer

plugins {
  id("com.github.jk1.dependency-license-report")

  id("otel.java-conventions")
  id("otel.publish-conventions")
  id("io.opentelemetry.instrumentation.javaagent-shadowing")
}

description = "OpenTelemetry Javaagent"
group = "io.opentelemetry.javaagent"

// this configuration collects libs that will be placed in the bootstrap classloader
val bootstrapLibs by configurations.creating {
  isCanBeResolved = true
  isCanBeConsumed = false
}
// this configuration collects only required instrumentations and agent machinery
val baseJavaagentLibs by configurations.creating {
  isCanBeResolved = true
  isCanBeConsumed = false
}
// this configuration collects libs that will be placed in the agent classloader, isolated from the instrumented application code
val javaagentLibs by configurations.creating {
  isCanBeResolved = true
  isCanBeConsumed = false
  extendsFrom(baseJavaagentLibs)
}

// exclude dependencies that are to be placed in bootstrap from agent libs - they won't be added to inst/
listOf(baseJavaagentLibs, javaagentLibs).forEach {
  it.run {
    exclude("io.opentelemetry", "opentelemetry-api")
    exclude("io.opentelemetry", "opentelemetry-api-logs")
    exclude("io.opentelemetry", "opentelemetry-semconv")
  }
}

val licenseReportDependencies by configurations.creating {
  extendsFrom(bootstrapLibs)
}

dependencies {
  bootstrapLibs(project(":instrumentation-api"))
  // opentelemetry-api is an api dependency of :instrumentation-api, but opentelemetry-api-logs is not
  bootstrapLibs("io.opentelemetry:opentelemetry-api-logs")
  bootstrapLibs(project(":instrumentation-api-semconv"))
  bootstrapLibs(project(":instrumentation-annotations-support"))
  bootstrapLibs(project(":javaagent-bootstrap"))

  // extension-api contains both bootstrap packages and agent packages
  bootstrapLibs(project(":javaagent-extension-api")) {
    // exclude javaagent dependencies from the bootstrap classpath
    exclude("net.bytebuddy")
    exclude("org.ow2.asm")
    exclude("io.opentelemetry", "opentelemetry-sdk")
    exclude("io.opentelemetry", "opentelemetry-sdk-extension-autoconfigure")
    exclude("io.opentelemetry", "opentelemetry-sdk-extension-autoconfigure-spi")
  }
  baseJavaagentLibs(project(":javaagent-extension-api"))

  baseJavaagentLibs(project(":javaagent-tooling"))
  baseJavaagentLibs(project(":javaagent-internal-logging-simple", configuration = "shadow"))
  baseJavaagentLibs(project(":muzzle"))
  baseJavaagentLibs(project(":instrumentation:opentelemetry-api:opentelemetry-api-1.0:javaagent"))
  baseJavaagentLibs(project(":instrumentation:opentelemetry-api:opentelemetry-api-1.4:javaagent"))
  baseJavaagentLibs(project(":instrumentation:opentelemetry-instrumentation-api:javaagent"))
  baseJavaagentLibs(project(":instrumentation:opentelemetry-instrumentation-annotations-1.16:javaagent"))
  baseJavaagentLibs(project(":instrumentation:executors:javaagent"))
  baseJavaagentLibs(project(":instrumentation:internal:internal-class-loader:javaagent"))
  baseJavaagentLibs(project(":instrumentation:internal:internal-eclipse-osgi-3.6:javaagent"))
  baseJavaagentLibs(project(":instrumentation:internal:internal-lambda:javaagent"))
  baseJavaagentLibs(project(":instrumentation:internal:internal-reflection:javaagent"))
  baseJavaagentLibs(project(":instrumentation:internal:internal-url-class-loader:javaagent"))

  // concurrentlinkedhashmap-lru and weak-lock-free are copied in to the instrumentation-api module
  licenseReportDependencies("com.googlecode.concurrentlinkedhashmap:concurrentlinkedhashmap-lru:1.4.2")
  licenseReportDependencies("com.blogspot.mydailyjava:weak-lock-free:0.18")
  // TODO ideally this would be :instrumentation instead of :javaagent-tooling
  //  in case there are dependencies (accidentally) pulled in by instrumentation modules
  //  but I couldn't get that to work
  licenseReportDependencies(project(":javaagent-tooling"))
  licenseReportDependencies(project(":javaagent-internal-logging-simple"))
  licenseReportDependencies(project(":javaagent-extension-api"))

  testCompileOnly(project(":javaagent-bootstrap"))
  testCompileOnly(project(":javaagent-extension-api"))

  testImplementation("com.google.guava:guava")
  testImplementation("io.opentelemetry:opentelemetry-sdk")
  testImplementation("io.opentracing.contrib.dropwizard:dropwizard-opentracing:0.2.2")
}

val javaagentDependencies = dependencies

// collect all bootstrap and javaagent instrumentation dependencies
project(":instrumentation").subprojects {
  val subProj = this

  plugins.withId("otel.javaagent-bootstrap") {
    javaagentDependencies.run {
      add(bootstrapLibs.name, project(subProj.path))
    }
  }

  plugins.withId("otel.javaagent-instrumentation") {
    javaagentDependencies.run {
      add(javaagentLibs.name, project(subProj.path))
    }
  }

  plugins.withId("otel.sdk-extension") {
    javaagentDependencies.run {
      add(javaagentLibs.name, project(subProj.path))
    }
  }
}

tasks {
  processResources {
    from(rootProject.file("licenses")) {
      into("META-INF/licenses")
    }
  }

  val buildBootstrapLibs by registering(ShadowJar::class) {
    configurations = listOf(bootstrapLibs)

    // exclude the agent part of the javaagent-extension-api; these classes will be added in relocate tasks
    exclude("io/opentelemetry/javaagent/extension/**")

    duplicatesStrategy = DuplicatesStrategy.EXCLUDE

    archiveFileName.set("bootstrapLibs.jar")
  }

  val relocateBaseJavaagentLibs by registering(ShadowJar::class) {
    configurations = listOf(baseJavaagentLibs)

    excludeBootstrapClasses()

    duplicatesStrategy = DuplicatesStrategy.FAIL

    archiveFileName.set("baseJavaagentLibs-relocated.jar")
  }

  val relocateJavaagentLibs by registering(ShadowJar::class) {
    configurations = listOf(javaagentLibs)

    excludeBootstrapClasses()

    duplicatesStrategy = DuplicatesStrategy.FAIL

    archiveFileName.set("javaagentLibs-relocated.jar")
  }

  // Includes everything needed for OOTB experience
  val shadowJar by existing(ShadowJar::class) {
    dependsOn(buildBootstrapLibs)
    from(zipTree(buildBootstrapLibs.get().archiveFile))

    dependsOn(relocateJavaagentLibs)
    isolateClasses(relocateJavaagentLibs.get().archiveFile)

    duplicatesStrategy = DuplicatesStrategy.FAIL

    archiveClassifier.set("")

    manifest {
      attributes(jar.get().manifest.attributes)
      attributes(
        "Main-Class" to "io.opentelemetry.javaagent.OpenTelemetryAgent",
        "Agent-Class" to "io.opentelemetry.javaagent.OpenTelemetryAgent",
        "Premain-Class" to "io.opentelemetry.javaagent.OpenTelemetryAgent",
        "Can-Redefine-Classes" to true,
        "Can-Retransform-Classes" to true
      )
    }
  }

  // Includes only the agent machinery and required instrumentations
  val baseJavaagentJar by registering(ShadowJar::class) {
    dependsOn(buildBootstrapLibs)
    from(zipTree(buildBootstrapLibs.get().archiveFile))

    dependsOn(relocateBaseJavaagentLibs)
    isolateClasses(relocateBaseJavaagentLibs.get().archiveFile)

    duplicatesStrategy = DuplicatesStrategy.FAIL

    archiveClassifier.set("base")

    manifest {
      attributes(shadowJar.get().manifest.attributes)
    }
  }

  jar {
    // Empty jar that cannot be used for anything and isn't published.
    archiveClassifier.set("dontuse")
  }

  val baseJar by configurations.creating {
    isCanBeConsumed = true
    isCanBeResolved = false
  }

  artifacts {
    add("baseJar", baseJavaagentJar)
  }

  assemble {
    dependsOn(shadowJar, baseJavaagentJar)
  }

  withType<Test>().configureEach {
    dependsOn(shadowJar)

    jvmArgs("-Dotel.javaagent.debug=true")

    jvmArgumentProviders.add(JavaagentProvider(shadowJar.flatMap { it.archiveFile }))

    testLogging {
      events("started")
    }
  }

  val cleanLicenses by registering(Delete::class) {
    delete(rootProject.file("licenses"))
  }

  named("generateLicenseReport").configure {
    dependsOn(cleanLicenses)
    finalizedBy(":spotlessApply")
  }

  // Because we reconfigure publishing to only include the shadow jar, the Gradle metadata is not correct.
  // Since we are fully bundled and have no dependencies, Gradle metadata wouldn't provide any advantage over
  // the POM anyways so in practice we shouldn't be losing anything.
  withType<GenerateModuleMetadata>().configureEach {
    enabled = false
  }
}

// Don't publish non-shadowed jar (shadowJar is in shadowRuntimeElements)
with(components["java"] as AdhocComponentWithVariants) {
  configurations.forEach {
    withVariantsFromConfiguration(configurations["apiElements"]) {
      skip()
    }
    withVariantsFromConfiguration(configurations["runtimeElements"]) {
      skip()
    }
  }
}

licenseReport {
  outputDir = rootProject.file("licenses").absolutePath

  renderers = arrayOf(InventoryMarkdownReportRenderer())

  configurations = arrayOf(licenseReportDependencies.name)

  excludeBoms = true

  excludeGroups = arrayOf(
    "io\\.opentelemetry\\.instrumentation",
    "io\\.opentelemetry\\.javaagent",
    "io\\.opentelemetry\\.dummy\\..*"
  )

  excludes = arrayOf(
    "io.opentelemetry:opentelemetry-bom-alpha",
    "opentelemetry-java-instrumentation:dependencyManagement"
  )

  filters = arrayOf(LicenseBundleNormalizer("$projectDir/license-normalizer-bundle.json", true))
}

fun CopySpec.isolateClasses(jar: Provider<RegularFile>) {
  from(zipTree(jar)) {
    // important to keep prefix "inst" short, as it is prefixed to lots of strings in runtime mem
    into("inst")
    rename("(^.*)\\.class\$", "\$1.classdata")
    // Rename LICENSE file since it clashes with license dir on non-case sensitive FSs (i.e. Mac)
    rename("""^LICENSE$""", "LICENSE.renamed")
    exclude("META-INF/INDEX.LIST")
    exclude("META-INF/*.DSA")
    exclude("META-INF/*.SF")
  }
}

// exclude bootstrap projects from javaagent libs - they won't be added to inst/
fun ShadowJar.excludeBootstrapClasses() {
  dependencies {
    exclude(project(":instrumentation-api"))
    exclude(project(":instrumentation-api-semconv"))
    exclude(project(":instrumentation-annotations-support"))
    exclude(project(":javaagent-bootstrap"))
  }

  // exclude the bootstrap part of the javaagent-extension-api
  exclude("io/opentelemetry/javaagent/bootstrap/**")
}

class JavaagentProvider(
  @InputFile
  @PathSensitive(PathSensitivity.RELATIVE)
  val agentJar: Provider<RegularFile>
) : CommandLineArgumentProvider {
  override fun asArguments(): Iterable<String> = listOf(
    "-javaagent:${file(agentJar).absolutePath}"
  )
}