Support JetBrains cache-redirector service for stable CI builds

build.gradle

@@ -83,6 +83,8 @@ buildscript {
         // JMH plugins
         classpath "com.github.jengelman.gradle.plugins:shadow:5.1.0"
     }
+
+    CacheRedirector.configureBuildScript(buildscript, rootProject)
 }
 
 import org.jetbrains.kotlin.gradle.plugin.KotlinPlatformType
@@ -295,7 +297,14 @@ configure(subprojects.findAll { !unpublished.contains(it.name) }) {
 // Report Kotlin compiler version when building project
 println("Using Kotlin compiler version: $org.jetbrains.kotlin.config.KotlinCompilerVersion.VERSION")
 
+// --------------- Cache redirector ---------------
+
+allprojects {
+    CacheRedirector.configure(project)
+}
+
 // --------------- Configure sub-projects that are published ---------------
+
 def publishTasks = getTasksByName("publish", true) + getTasksByName("publishNpm", true)
 
 task deploy(dependsOn: publishTasks)

buildSrc/build.gradle.kts

@@ -1,13 +1,41 @@
+/*
+ * Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
 import java.util.*
 
+buildscript {
+    val cacheRedirectorEnabled = System.getenv("CACHE_REDIRECTOR")?.toBoolean() == true
+
+    if (cacheRedirectorEnabled) {
+        println("Redirecting repositories for buildSrc buildscript")
+    }
+
+    repositories {
+        if (cacheRedirectorEnabled) {
+            maven("https://cache-redirector.jetbrains.com/plugins.gradle.org/m2")
+        } else {
+            maven("https://plugins.gradle.org/m2")
+        }
+    }
+}
+
 plugins {
     `kotlin-dsl`
 }
 
+val cacheRedirectorEnabled = System.getenv("CACHE_REDIRECTOR")?.toBoolean() == true
+
 repositories {
-    gradlePluginPortal()
-    maven("https://kotlin.bintray.com/kotlin-eap")
-    maven("https://kotlin.bintray.com/kotlin-dev")
+    if (cacheRedirectorEnabled) {
+        maven("https://cache-redirector.jetbrains.com/plugins.gradle.org/m2")
+        maven("https://cache-redirector.jetbrains.com/dl.bintray.com/kotlin/kotlin-eap")
+        maven("https://cache-redirector.jetbrains.com/dl.bintray.com/kotlin/kotlin-dev")
+    } else {
+        maven("https://plugins.gradle.org/m2")
+        maven("https://dl.bintray.com/kotlin/kotlin-eap")
+        maven("https://dl.bintray.com/kotlin/kotlin-dev")
+    }
 }
 
 kotlinDslPluginOptions {

buildSrc/src/main/kotlin/CacheRedirector.kt

@@ -0,0 +1,152 @@
+/*
+ * Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+import org.gradle.api.*
+import org.gradle.api.artifacts.dsl.*
+import org.gradle.api.artifacts.repositories.*
+import org.gradle.api.initialization.dsl.*
+import java.net.*
+
+/**
+ * Enabled via environment variable, so that it can be reliably accessed from any piece of the build script,
+ * including buildSrc within TeamCity CI.
+ */
+private val cacheRedirectorEnabled = System.getenv("CACHE_REDIRECTOR")?.toBoolean() == true
+
+/**
+ *  The list of repositories supported by cache redirector should be synced with the list at https://cache-redirector.jetbrains.com/redirects_generated.html
+ *  To add a repository to the list create an issue in ADM project (example issue https://youtrack.jetbrains.com/issue/IJI-149)
+ */
+private val mirroredUrls = listOf(
+    "https://cdn.azul.com/zulu/bin",
+    "https://clojars.org/repo",
+    "https://dl.bintray.com/d10xa/maven",
+    "https://dl.bintray.com/groovy/maven",
+    "https://dl.bintray.com/jetbrains/maven-patched",
+    "https://dl.bintray.com/jetbrains/scala-plugin-deps",
+    "https://dl.bintray.com/kodein-framework/Kodein-DI",
+    "https://dl.bintray.com/konsoletyper/teavm",
+    "https://dl.bintray.com/kotlin/kotlin-dev",
+    "https://dl.bintray.com/kotlin/kotlin-eap",
+    "https://dl.bintray.com/kotlin/kotlinx.html",
+    "https://dl.bintray.com/kotlin/kotlinx",
+    "https://dl.bintray.com/kotlin/ktor",
+    "https://dl.bintray.com/scalacenter/releases",
+    "https://dl.bintray.com/scalamacros/maven",
+    "https://dl.bintray.com/kotlin/exposed",
+    "https://dl.bintray.com/cy6ergn0m/maven",
+    "https://dl.bintray.com/kotlin/kotlin-js-wrappers",
+    "https://dl.google.com/android/repository",
+    "https://dl.google.com/dl/android/maven2",
+    "https://dl.google.com/dl/android/studio/ide-zips",
+    "https://dl.google.com/go",
+    "https://download.jetbrains.com",
+    "https://jcenter.bintray.com",
+    "https://jetbrains.bintray.com/dekaf",
+    "https://jetbrains.bintray.com/intellij-jbr",
+    "https://jetbrains.bintray.com/intellij-jdk",
+    "https://jetbrains.bintray.com/intellij-plugin-service",
+    "https://jetbrains.bintray.com/intellij-terraform",
+    "https://jetbrains.bintray.com/intellij-third-party-dependencies",
+    "https://jetbrains.bintray.com/jediterm",
+    "https://jetbrains.bintray.com/kotlin-native-dependencies",
+    "https://jetbrains.bintray.com/markdown",
+    "https://jetbrains.bintray.com/teamcity-rest-client",
+    "https://jetbrains.bintray.com/test-discovery",
+    "https://jetbrains.bintray.com/wormhole",
+    "https://jitpack.io",
+    "https://maven.pkg.jetbrains.space/kotlin/p/kotlin/dev",
+    "https://maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap",
+    "https://maven.pkg.jetbrains.space/kotlin/p/kotlin/eap",
+    "https://kotlin.bintray.com/dukat",
+    "https://kotlin.bintray.com/kotlin-dependencies",
+    "https://oss.sonatype.org/content/repositories/releases",
+    "https://oss.sonatype.org/content/repositories/snapshots",
+    "https://oss.sonatype.org/content/repositories/staging",
+    "https://packages.confluent.io/maven/",
+    "https://plugins.gradle.org/m2",
+    "https://plugins.jetbrains.com/maven",
+    "https://repo1.maven.org/maven2",
+    "https://repo.grails.org/grails/core",
+    "https://repo.jenkins-ci.org/releases",
+    "https://repo.maven.apache.org/maven2",
+    "https://repo.spring.io/milestone",
+    "https://repo.typesafe.com/typesafe/ivy-releases",
+    "https://services.gradle.org",
+    "https://www.exasol.com/artifactory/exasol-releases",
+    "https://www.myget.org/F/intellij-go-snapshots/maven",
+    "https://www.myget.org/F/rd-model-snapshots/maven",
+    "https://www.myget.org/F/rd-snapshots/maven",
+    "https://www.python.org/ftp",
+    "https://www.jetbrains.com/intellij-repository/nightly",
+    "https://www.jetbrains.com/intellij-repository/releases",
+    "https://www.jetbrains.com/intellij-repository/snapshots"
+)
+
+private val aliases = mapOf(
+    "https://repo.maven.apache.org/maven2" to "https://repo1.maven.org/maven2", // Maven Central
+    "https://kotlin.bintray.com/kotlin-dev" to "https://dl.bintray.com/kotlin/kotlin-dev",
+    "https://kotlin.bintray.com/kotlin-eap" to "https://dl.bintray.com/kotlin/kotlin-eap",
+    "https://kotlin.bintray.com/kotlinx" to "https://dl.bintray.com/kotlin/kotlinx"
+)
+
+private fun URI.toCacheRedirectorUri() = URI("https://cache-redirector.jetbrains.com/$host/$path")
+
+private fun URI.maybeRedirect(): URI? {
+    val url = toString().trimEnd('/')
+    val dealiasedUrl = aliases.getOrDefault(url, url)
+
+    return if (mirroredUrls.any { dealiasedUrl.startsWith(it) }) {
+        URI(dealiasedUrl).toCacheRedirectorUri()
+    } else {
+        null
+    }
+}
+
+private fun URI.isCachedOrLocal() = scheme == "file" ||
+            host == "cache-redirector.jetbrains.com" ||
+            host == "teamcity.jetbrains.com" ||
+            host == "buildserver.labs.intellij.net"
+
+private fun Project.checkRedirectUrl(url: URI, containerName: String): URI {
+    val redirected = url.maybeRedirect()
+    if (redirected == null && !url.isCachedOrLocal()) {
+        val msg = "Repository $url in $containerName should be cached with cache-redirector"
+        val details = "Using non cached repository may lead to download failures in CI builds." +
+            " Check buildSrc/src/main/kotlin/CacheRedirector.kt for details."
+        logger.warn("WARNING - $msg\n$details")
+    }
+    return if (cacheRedirectorEnabled) redirected ?: url else url
+}
+
+private fun Project.checkRedirect(repositories: RepositoryHandler, containerName: String) {
+    if (cacheRedirectorEnabled) {
+        logger.info("Redirecting repositories for $containerName")
+    }
+    for (repository in repositories) {
+        when (repository) {
+            is MavenArtifactRepository -> repository.url = checkRedirectUrl(repository.url, containerName)
+            is IvyArtifactRepository -> repository.url = checkRedirectUrl(repository.url, containerName)
+        }
+    }
+}
+
+// Used from Groovy scripts
+object CacheRedirector {
+    /**
+     * Substitutes repositories in buildScript { } block.
+     */
+    @JvmStatic
+    fun ScriptHandler.configureBuildScript(rootProject: Project) {
+        rootProject.checkRedirect(repositories, "${rootProject.displayName} buildscript")
+    }
+
+    /**
+     * Substitutes repositories in a project.
+     */
+    @JvmStatic
+    fun Project.configure() {
+        checkRedirect(repositories, displayName)
+    }
+}