Repository: hseeberger/constructr Branch: master Commit: ab10d4ecbb59 Files: 28 Total size: 81.6 KB Directory structure: gitextract_n96ddc4r/ ├── .gitignore ├── .scalafmt.conf ├── .travis.yml ├── LICENSE ├── NOTICE ├── README.md ├── bin/ │ └── run-etcd.sh ├── build.sbt ├── coordination/ │ └── src/ │ └── main/ │ └── scala/ │ └── de/ │ └── heikoseeberger/ │ └── constructr/ │ └── coordination/ │ └── Coordination.scala ├── coordination-etcd/ │ └── src/ │ ├── main/ │ │ ├── resources/ │ │ │ └── reference.conf │ │ └── scala/ │ │ └── de/ │ │ └── heikoseeberger/ │ │ └── constructr/ │ │ └── coordination/ │ │ └── etcd/ │ │ └── EtcdCoordination.scala │ └── test/ │ └── scala/ │ └── de/ │ └── heikoseeberger/ │ └── constructr/ │ └── coordination/ │ └── etcd/ │ └── EtcdCoordinationSpec.scala ├── core/ │ └── src/ │ ├── main/ │ │ ├── resources/ │ │ │ └── reference.conf │ │ └── scala/ │ │ └── de/ │ │ └── heikoseeberger/ │ │ └── constructr/ │ │ ├── Constructr.scala │ │ ├── ConstructrExtension.scala │ │ ├── ConstructrMachine.scala │ │ └── package.scala │ ├── multi-jvm/ │ │ ├── resources/ │ │ │ ├── application.conf │ │ │ └── log4j2.xml │ │ └── scala/ │ │ └── de/ │ │ └── heikoseeberger/ │ │ └── constructr/ │ │ ├── MultiNodeConstructrSpec.scala │ │ └── MultiNodeEtcdConstructrSpec.scala │ └── test/ │ ├── resources/ │ │ └── application.conf │ └── scala/ │ └── de/ │ └── heikoseeberger/ │ └── constructr/ │ ├── ConstructrExtensionSpec.scala │ ├── ConstructrMachineSpec.scala │ └── testutil/ │ └── CoordinationInfo.scala ├── project/ │ ├── build.properties │ └── plugins.sbt └── shell-prompt.sbt ================================================ FILE CONTENTS ================================================ ================================================ FILE: .gitignore ================================================ # sbt lib_managed project/project target # Worksheets (Eclipse or IntelliJ) *.sc # Eclipse .cache* .classpath .project .scala_dependencies .settings .target .worksheet # IntelliJ .idea # ENSIME .ensime .ensime_lucene .ensime_cache # Mac .DS_Store # Akka Persistence journal snapshots # Log files *.log ================================================ FILE: .scalafmt.conf ================================================ style = defaultWithAlign danglingParentheses = true indentOperator = spray maxColumn = 100 project.excludeFilters = [".*\\.sbt"] rewrite.rules = [RedundantBraces, RedundantParens, SortImports] spaces.inImportCurlyBraces = true unindentTopLevelOperators = true ================================================ FILE: .travis.yml ================================================ language: scala scala: - 2.11.11 - 2.12.4 jdk: - oraclejdk8 sbt_args: -Dakka.test.timefactor=3.0 sudo: required services: - docker before_install: - docker run --detach --publish 2379:2379 quay.io/coreos/etcd:v2.3.7 --listen-client-urls http://0.0.0.0:2379 --advertise-client-urls http://127.0.0.1:2379 ================================================ FILE: LICENSE ================================================ Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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See the License for the specific language governing permissions and limitations under the License. ================================================ FILE: NOTICE ================================================ Copyright 2015 Heiko Seeberger ================================================ FILE: README.md ================================================ # ConstructR # [![Join the chat at https://gitter.im/hseeberger/constructr](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/hseeberger/constructr?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) ConstructR is for bootstrapping (construction) an [Akka](http://akka.io) cluster by using a coordination service. Disambiguation: Despite the similar name, ConstructR is not related to [Lightbend ConductR](http://www.lightbend.com/products/conductr). ConstructR utilizes a key-value coordination service like etcd to automate bootstrapping or joining a cluster. It stores each member node under the key `/constructr/$clusterName/nodes/$address` where `$clusterName` is for disambiguating multiple clusters and `$address` is a Base64 encoded Akka `Address`. These keys expire after a configurable time in order to avoid stale information. Therefore ConstructR refreshes each key periodically. In a nutshell, ConstructR is a state machine which first tries to get the nodes from the coordination service. If none are available it tries to acquire a lock, e.g. via a CAS write for etcd, and uses itself or retries getting the nodes. Then it joins using these nodes as seed nodes. After that it adds its address to the nodes and starts the refresh loop: ``` ┌───────────────────┐ ┌───────────────────┐ ┌──▶│ GettingNodes │◀─────────────│BeforeGettingNodes │ │ └───────────────────┘ delayed └───────────────────┘ │ │ │ ▲ join-failed │ non-empty │ └──────────────────────┐ │ failure │ ▼ empty ▼ │ │ ┌───────────────────┐ ┌───────────────────┐ └───│ Joining │◀─────────────│ Locking │ └───────────────────┘ success └───────────────────┘ │ member-joined │ ▼ ┌───────────────────┐ │ AddingSelf │ └───────────────────┘ │ ┌────────────────────────────┐ │ │ │ ▼ ▼ │ ┌───────────────────┐ ┌───────────────────┐ │ RefreshScheduled │─────────────▶│ Refreshing │ └───────────────────┘ └───────────────────┘ ``` If something goes finally wrong when interacting with the coordination service, e.g. a permanent timeout after a configurable number of retries, ConstructR terminates its `ActorSystem` in the spirit of "fail fast". ``` scala // All releases including intermediate ones are published here, // final ones are also published to Maven Central. resolvers += Resolver.bintrayRepo("hseeberger", "maven") libraryDependencies ++= Vector( "de.heikoseeberger" %% "constructr" % "0.19.0", "de.heikoseeberger" %% "constructr-coordination-etcd" % "0.19.0", // in case of using etcd for coordination ... ) ``` Simply add the `ConstructrExtension` to the `extensions` configuration setting: ``` akka.extensions = [de.heikoseeberger.constructr.ConstructrExtension] ``` This will start the `Constructr` actor as a system actor. Alternatively start it yourself as early as possible if you feel so inclined. The following listing shows the available configuration settings with their defaults: ``` constructr { coordination { host = localhost port = 2379 } coordination-timeout = 3 seconds // Maximum response time for coordination service (e.g. etcd) join-timeout = 15 seconds // Might depend on cluster size and network properties abort-on-join-timeout = false // Abort the attempt to join if true; otherwise restart the process from scratch max-nr-of-seed-nodes = 0 // Any nonpositive value means Int.MaxValue nr-of-retries = 2 // Nr. of tries are nr. of retries + 1 refresh-interval = 30 seconds // TTL is refresh-interval * ttl-factor retry-delay = 3 seconds // Give coordination service (e.g. etcd) some delay before retrying ttl-factor = 2.0 // Must be greater or equal 1 + ((coordination-timeout * (1 + nr-of-retries) + retry-delay * nr-of-retries)/ refresh-interval)! ignore-refresh-failures = false // Ignore failures once machine is already in "Refreshing" state. It prevents from FSM being terminated due to exhausted number of retries. } ``` ## Coordination ConstructR comes with out-of-the-box support for etcd: simply depend on the "constructr-coordination-etcd" module. If you want to use some other coordination backend, e.g. Consul, simply implement the `Coordination` trait from the "constructr-coordination" module and make sure to provide the fully qualified class name via the `constructr.coordination.class-name` configuration setting. ### Community Coordination Implementations There are some implementations for other coordination backends than etcd: * [Tecsisa/constructr-consul](https://github.com/Tecsisa/constructr-consul): This library enables to use Consul as cluster coordinator in a ConstructR based cluster. * [everpeace/constructr-redis](https://github.com/everpeace/constructr-redis): This library enables to use Redis as cluster coordinator in a ConstructR based cluster. * [typesafehub/constructr-zookeeper](https://github.com/typesafehub/constructr-zookeeper): This library enables to use ZooKeeper as cluster coordinator in a ConstructR based cluster. ## Testing etcd must be running, e.g.: ``` docker run \ --detach \ --name etcd \ --publish 2379:2379 \ quay.io/coreos/etcd:v2.3.8 \ --listen-client-urls http://0.0.0.0:2379 \ --advertise-client-urls http://192.168.99.100:2379 ``` ## Contribution policy ## Contributions via GitHub pull requests are gladly accepted from their original author. Along with any pull requests, please state that the contribution is your original work and that you license the work to the project under the project's open source license. Whether or not you state this explicitly, by submitting any copyrighted material via pull request, email, or other means you agree to license the material under the project's open source license and warrant that you have the legal authority to do so. Please make sure to follow these conventions: - For each contribution there must be a ticket (GitHub issue) with a short descriptive name, e.g. "Respect seed-nodes configuration setting" - Work should happen in a branch named "ISSUE-DESCRIPTION", e.g. "32-respect-seed-nodes" - Before a PR can be merged, all commits must be squashed into one with its message made up from the ticket name and the ticket id, e.g. "Respect seed-nodes configuration setting (closes #32)" ## License ## This code is open source software licensed under the [Apache 2.0 License](http://www.apache.org/licenses/LICENSE-2.0.html). ================================================ FILE: bin/run-etcd.sh ================================================ #!/usr/bin/env sh : ${HOST:=$(ipconfig getifaddr en0)} : ${HOST:=$(ipconfig getifaddr en1)} : ${HOST:=$(ipconfig getifaddr en2)} : ${HOST:=$(ipconfig getifaddr en3)} : ${HOST:=$(ipconfig getifaddr en4)} if [ -z $HOST ]; then echo HOST neither defined nor detectable! exit 1 fi docker run \ --detach \ --name etcd \ --publish 2379:2379 \ quay.io/coreos/etcd:v2.3.7 \ --advertise-client-urls http://${HOST}:2379 \ --listen-client-urls http://0.0.0.0:2379 ================================================ FILE: build.sbt ================================================ // ***************************************************************************** // Projects // ***************************************************************************** lazy val constructr = project .in(file(".")) .enablePlugins(GitVersioning) .aggregate(core, coordination, `coordination-etcd`) .settings(settings) .settings( unmanagedSourceDirectories.in(Compile) := Seq.empty, unmanagedSourceDirectories.in(Test) := Seq.empty, publishArtifact := false ) lazy val core = project .enablePlugins(AutomateHeaderPlugin) .configs(MultiJvm) .dependsOn(coordination,`coordination-etcd` % "test->compile") .settings(settings) .settings(multiJvmSettings) .settings( name := "constructr", libraryDependencies ++= Seq( library.akkaCluster, library.akkaLog4j % Test, library.akkaMultiNodeTestkit % Test, library.akkaTestkit % Test, library.log4jCore % Test, library.mockitoCore % Test, library.scalaTest % Test ) ) lazy val coordination = project .enablePlugins(AutomateHeaderPlugin) .settings(settings) .settings( name := "constructr-coordination", libraryDependencies ++= Seq( library.akkaActor ) ) lazy val `coordination-etcd` = project .enablePlugins(AutomateHeaderPlugin) .dependsOn(coordination) .settings(settings) .settings( name := "constructr-coordination-etcd", libraryDependencies ++= Seq( library.akkaHttp, library.akkaStream, library.circeParser, library.akkaTestkit % Test, library.scalaTest % Test ) ) // ***************************************************************************** // Library dependencies // ***************************************************************************** lazy val library = new { object Version { final val akka = "2.5.6" final val akkaHttp = "10.0.10" final val akkaLog4j = "1.5.0" final val circe = "0.8.0" final val log4j = "2.9.1" final val mockito = "2.7.22" final val scalaTest = "3.0.4" } val akkaActor = "com.typesafe.akka" %% "akka-actor" % Version.akka val akkaCluster = "com.typesafe.akka" %% "akka-cluster" % Version.akka val akkaHttp = "com.typesafe.akka" %% "akka-http" % Version.akkaHttp val akkaLog4j = "de.heikoseeberger" %% "akka-log4j" % Version.akkaLog4j val akkaMultiNodeTestkit = "com.typesafe.akka" %% "akka-multi-node-testkit" % Version.akka val akkaSlf4j = "com.typesafe.akka" %% "akka-slf4j" % Version.akka val akkaStream = "com.typesafe.akka" %% "akka-stream" % Version.akka val akkaTestkit = "com.typesafe.akka" %% "akka-testkit" % Version.akka val circeParser = "io.circe" %% "circe-parser" % Version.circe val log4jCore = "org.apache.logging.log4j" % "log4j-core" % Version.log4j val mockitoCore = "org.mockito" % "mockito-core" % Version.mockito val scalaTest = "org.scalatest" %% "scalatest" % Version.scalaTest } // ***************************************************************************** // Settings // ***************************************************************************** | lazy val settings = commonSettings ++ gitSettings ++ scalafmtSettings ++ publishSettings ++ multiJvmSettings ++ bintraySettings lazy val commonSettings = Seq( // scalaVersion from .travis.yml // crossScalaVersions from .travis.yml organization := "de.heikoseeberger", organizationName := "Heiko Seeberger", startYear := Some(2015), licenses += ("Apache-2.0", url("http://www.apache.org/licenses/LICENSE-2.0")), scalacOptions ++= Seq( "-unchecked", "-deprecation", "-language:_", "-target:jvm-1.8", "-encoding", "UTF-8" ), unmanagedSourceDirectories.in(Compile) := Seq(scalaSource.in(Compile).value), unmanagedSourceDirectories.in(Test) := Seq(scalaSource.in(Test).value) ) lazy val gitSettings = Seq( git.useGitDescribe := true ) lazy val scalafmtSettings = Seq( scalafmtOnCompile := true, scalafmtOnCompile.in(Sbt) := false, scalafmtVersion := "1.3.0" ) lazy val publishSettings = Seq( homepage := Some(url("https://github.com/hseeberger/constructr")), scmInfo := Some(ScmInfo(url("https://github.com/hseeberger/constructr"), "git@github.com:hseeberger/constructr.git")), developers += Developer("hseeberger", "Heiko Seeberger", "mail@heikoseeberger.de", url("https://github.com/hseeberger")), pomIncludeRepository := (_ => false) ) lazy val bintraySettings = Seq( bintrayPackage := "constructr" ) lazy val multiJvmSettings = com.typesafe.sbt.SbtMultiJvm.multiJvmSettings ++ inConfig(MultiJvm)(scalafmtSettings) ++ headerSettings(MultiJvm) ++ automateHeaderSettings(MultiJvm) ++ Seq( unmanagedSourceDirectories.in(MultiJvm) := Seq(scalaSource.in(MultiJvm).value), test.in(Test) := test.in(MultiJvm).dependsOn(test.in(Test)).value ) ================================================ FILE: coordination/src/main/scala/de/heikoseeberger/constructr/coordination/Coordination.scala ================================================ /* * Copyright 2015 Heiko Seeberger * * 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 de.heikoseeberger.constructr.coordination import akka.Done import akka.actor.{ ActorSystem, Address } import scala.concurrent.Future import scala.concurrent.duration.FiniteDuration object Coordination { def apply(clusterName: String, system: ActorSystem): Coordination = try { val className = system.settings.config.getString("constructr.coordination.class-name") Class .forName(className) .getConstructor(classOf[String], classOf[ActorSystem]) .newInstance(clusterName, system) .asInstanceOf[Coordination] } catch { case _: NoSuchMethodException => throw new Exception( """|A Coordination implementation must provide a constructor with the following signature: |(clusterName: String, system: ActorSystem)""".stripMargin ) } } /** * Abstraction for a coordination service. Implementations must provide a constructor with the following signature: * `(prefix: String, clusterName: String, system: ActorSystem)`. */ trait Coordination { /** * Get the nodes. * * @return future of nodes */ def getNodes(): Future[Set[Address]] /** * Akquire a lock for bootstrapping the cluster (first node). * * @param self self node * @param ttl TTL for the lock * @return true, if lock could be akquired, else false */ def lock(self: Address, ttl: FiniteDuration): Future[Boolean] /** * Add self to the nodes. * * @param self self node * @param ttl TTL for the node entry * @return future signaling done */ def addSelf(self: Address, ttl: FiniteDuration): Future[Done] /** * Refresh entry for self. * * @param self self node * @param ttl TTL for the node entry * @return future signaling done */ def refresh(self: Address, ttl: FiniteDuration): Future[Done] } ================================================ FILE: coordination-etcd/src/main/resources/reference.conf ================================================ constructr { coordination { class-name = de.heikoseeberger.constructr.coordination.etcd.EtcdCoordination host = localhost port = 2379 } } ================================================ FILE: coordination-etcd/src/main/scala/de/heikoseeberger/constructr/coordination/etcd/EtcdCoordination.scala ================================================ /* * Copyright 2015 Heiko Seeberger * * 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 de.heikoseeberger.constructr.coordination package etcd import akka.Done import akka.actor.{ ActorSystem, Address, AddressFromURIString } import akka.http.scaladsl.Http import akka.http.scaladsl.client.RequestBuilding.{ Get, Put } import akka.http.scaladsl.model.StatusCodes.{ Created, NotFound, OK, PreconditionFailed } import akka.http.scaladsl.model.{ HttpRequest, HttpResponse, ResponseEntity, StatusCode, Uri } import akka.http.scaladsl.unmarshalling.Unmarshal import akka.stream.ActorMaterializer import akka.stream.scaladsl.Sink import io.circe.Json import io.circe.parser.parse import java.nio.charset.StandardCharsets.UTF_8 import java.util.Base64.{ getUrlDecoder, getUrlEncoder } import scala.concurrent.Future import scala.concurrent.duration.{ Duration, FiniteDuration } object EtcdCoordination { final case class UnexpectedStatusCode(uri: Uri, statusCode: StatusCode) extends RuntimeException( s"Unexpected status code $statusCode for URI $uri" ) private def toSeconds(duration: Duration) = (duration.toSeconds + 1).toString } final class EtcdCoordination(clusterName: String, system: ActorSystem) extends Coordination { import EtcdCoordination._ private implicit val mat = ActorMaterializer()(system) import mat.executionContext private val kvUri = { val host = system.settings.config.getString("constructr.coordination.host") val port = system.settings.config.getInt("constructr.coordination.port") Uri(s"http://$host:$port/v2/keys") } private val baseUri = kvUri.withPath(kvUri.path / "constructr" / clusterName) private val nodesUri = baseUri.withPath(baseUri.path / "nodes") override def getNodes() = { def unmarshalNodes(entity: ResponseEntity) = { def toNodes(s: String) = { def jsonToNode(json: Json) = { val init = nodesUri.path.toString.stripPrefix(kvUri.path.toString) val key = json.hcursor .get[String]("key") .fold(throw _, identity) .stripPrefix(s"$init/") val uri = new String(getUrlDecoder.decode(key), UTF_8) AddressFromURIString(uri) } import cats.syntax.either._ // for Scala 2.11 parse(s) .fold(throw _, identity) .hcursor .downField("node") .get[Set[Json]]("nodes") .getOrElse(Set.empty) .map(jsonToNode) } Unmarshal(entity).to[String].map(toNodes) } responseFor(Get(nodesUri)).flatMap { case HttpResponse(OK, _, entity, _) => unmarshalNodes(entity) case HttpResponse(NotFound, _, entity, _) => ignore(entity).map(_ => Set.empty) case HttpResponse(other, _, entity, _) => ignore(entity).map(_ => throw UnexpectedStatusCode(nodesUri, other)) } } override def lock(self: Address, ttl: FiniteDuration) = { val lockUri = baseUri .withPath(baseUri.path / "lock") .withQuery(Uri.Query("value" -> self.toString)) def readLock() = { def unmarshalLockHolder(entity: ResponseEntity) = { def toLockHolder(s: String) = parse(s) .fold(throw _, identity) .hcursor .downField("node") .get[String]("value") .fold(throw _, identity) Unmarshal(entity).to[String].map(toLockHolder) } responseFor(Get(lockUri)).flatMap { case HttpResponse(OK, _, entity, _) => unmarshalLockHolder(entity).map(Some(_)) case HttpResponse(NotFound, _, entity, _) => ignore(entity).map(_ => None) case HttpResponse(other, _, entity, _) => ignore(entity).map(_ => throw UnexpectedStatusCode(nodesUri, other)) } } def writeLock() = { val uri = lockUri.withQuery( ("prevExist" -> "false") +: ("ttl" -> toSeconds(ttl)) +: Uri.Query(lockUri.rawQueryString) ) responseFor(Put(uri)).flatMap { case HttpResponse(Created, _, entity, _) => ignore(entity).map(_ => true) case HttpResponse(PreconditionFailed, _, entity, _) => ignore(entity).map(_ => false) case HttpResponse(other, _, entity, _) => ignore(entity).map(_ => throw UnexpectedStatusCode(lockUri, other)) } } def updateLock(lockHolder: String) = { val uri = lockUri.withQuery( ("prevValue" -> lockHolder) +: ("ttl" -> toSeconds(ttl)) +: Uri.Query(lockUri.rawQueryString) ) responseFor(Put(uri)).flatMap { case HttpResponse(OK, _, entity, _) => ignore(entity).map(_ => true) case HttpResponse(PreconditionFailed, _, entity, _) => ignore(entity).map(_ => false) case HttpResponse(other, _, entity, _) => ignore(entity).map(_ => throw UnexpectedStatusCode(lockUri, other)) } } readLock().flatMap { case Some(h) if h == self.toString => updateLock(h) case Some(_) => Future.successful(false) case None => writeLock() } } override def addSelf(self: Address, ttl: FiniteDuration) = addSelfOrRefresh(self, ttl) override def refresh(self: Address, ttl: FiniteDuration) = addSelfOrRefresh(self, ttl) private def addSelfOrRefresh(self: Address, ttl: FiniteDuration) = { val node = getUrlEncoder.encodeToString(self.toString.getBytes(UTF_8)) val query = Uri.Query("ttl" -> toSeconds(ttl), "value" -> self.toString) val uri = nodesUri.withPath(nodesUri.path / node).withQuery(query) responseFor(Put(uri)).flatMap { case HttpResponse(OK | Created, _, entity, _) => ignore(entity).map(_ => Done) case HttpResponse(other, _, entity, _) => ignore(entity).map(_ => throw UnexpectedStatusCode(uri, other)) } } private def responseFor(request: HttpRequest) = Http(system).singleRequest(request) private def ignore(entity: ResponseEntity) = entity.dataBytes.runWith(Sink.ignore) } ================================================ FILE: coordination-etcd/src/test/scala/de/heikoseeberger/constructr/coordination/etcd/EtcdCoordinationSpec.scala ================================================ /* * Copyright 2015 Heiko Seeberger * * 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 de.heikoseeberger.constructr.coordination.etcd import akka.Done import akka.actor.{ ActorSystem, AddressFromURIString } import akka.testkit.{ TestDuration, TestProbe } import com.typesafe.config.ConfigFactory import org.scalatest.{ BeforeAndAfterAll, Matchers, WordSpec } import scala.concurrent.duration.{ Duration, DurationInt, FiniteDuration } import scala.concurrent.{ Await, Awaitable } import scala.util.Random object EtcdCoordinationSpec { private val coordinationHost = { val dockerHostPattern = """tcp://(\S+):\d{1,5}""".r sys.env .get("DOCKER_HOST") .collect { case dockerHostPattern(address) => address } .getOrElse("127.0.0.1") } } class EtcdCoordinationSpec extends WordSpec with Matchers with BeforeAndAfterAll { import EtcdCoordinationSpec._ private implicit val system = { val config = ConfigFactory .parseString(s"constructr.coordination.host = $coordinationHost") .withFallback(ConfigFactory.load()) ActorSystem("default", config) } private val address = AddressFromURIString("akka.tcp://default@a:2552") private val address2 = AddressFromURIString("akka.tcp://default@b:2552") "EtcdCoordination" should { "correctly interact with etcd" in { val coordination = new EtcdCoordination(randomString(), system) resultOf(coordination.getNodes()) shouldBe 'empty resultOf(coordination.lock(address, 10.seconds.dilated)) shouldBe true resultOf(coordination.lock(address, 10.seconds.dilated)) shouldBe true resultOf(coordination.lock(address2, 10.seconds.dilated)) shouldBe false resultOf(coordination.addSelf(address, 10.seconds.dilated)) shouldBe Done resultOf(coordination.getNodes()) shouldBe Set(address) resultOf(coordination.refresh(address, 1.second.dilated)) shouldBe Done resultOf(coordination.getNodes()) shouldBe Set(address) val probe = TestProbe() probe.within(5.seconds.dilated) { // 2 seconds should be enough, but who knows hows ... probe.awaitAssert { resultOf(coordination.getNodes()) shouldBe 'empty } } } } override protected def afterAll() = { Await.ready(system.terminate(), Duration.Inf) super.afterAll() } private def resultOf[A](awaitable: Awaitable[A], max: FiniteDuration = 3.seconds.dilated) = Await.result(awaitable, max) private def randomString() = math.abs(Random.nextInt).toString } ================================================ FILE: core/src/main/resources/reference.conf ================================================ constructr { coordination-timeout = 3 seconds // Maximum response time for coordination service (e.g. etcd) join-timeout = 15 seconds // Might depend on cluster size and network properties abort-on-join-timeout = false // Abort the attempt to join if true; otherwise restart the process from scratch max-nr-of-seed-nodes = 0 // Any nonpositive value means Int.MaxValue nr-of-retries = 2 // Nr. of tries are nr. of retries + 1 refresh-interval = 30 seconds // TTL is refresh-interval * ttl-factor retry-delay = 3 seconds // Give coordination service (e.g. etcd) some delay before retrying ttl-factor = 2.0 // Must be greater or equal 1 + ((coordination-timeout * (1 + nr-of-retries) + retry-delay * nr-of-retries)/ refresh-interval)! ignore-refresh-failures = false // Ignore failures once machine is already in "Refreshing" state. It prevents from FSM being terminated due to exhausted number of retries. } ================================================ FILE: core/src/main/scala/de/heikoseeberger/constructr/Constructr.scala ================================================ /* * Copyright 2015 Heiko Seeberger * * 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 de.heikoseeberger.constructr import akka.actor.{ Actor, ActorLogging, ActorRef, Props, SupervisorStrategy, Terminated } import akka.cluster.{ Cluster, Member } import akka.cluster.ClusterEvent.{ InitialStateAsEvents, MemberExited, MemberLeft, MemberRemoved } import akka.cluster.MemberStatus.Up import de.heikoseeberger.constructr.coordination.Coordination import scala.concurrent.duration.{ FiniteDuration, NANOSECONDS } object Constructr { final val Name = "constructr" def props: Props = Props(new Constructr) } final class Constructr private extends Actor with ActorLogging { override val supervisorStrategy = SupervisorStrategy.stoppingStrategy private val cluster = Cluster(context.system) if (cluster.settings.SeedNodes.isEmpty) { log.info("Creating constructr-machine, because no seed-nodes defined") cluster.subscribe(self, InitialStateAsEvents, classOf[MemberLeft], classOf[MemberExited], classOf[MemberRemoved]) context.become(active(context.watch(createConstructrMachine()))) } else { log.info("Stopping self, because seed-nodes defined") context.stop(self) } override def receive = Actor.emptyBehavior private def active(machine: ActorRef): Receive = { case Terminated(`machine`) => val selfAddress = cluster.selfAddress def isSelfAndUp(member: Member) = member.address == selfAddress && member.status == Up if (cluster.state.members.exists(isSelfAndUp)) { log.error("Leaving, because constructr-machine terminated!") cluster.leave(selfAddress) } else { log.error("Terminating system, because constructr-machine terminated!") context.system.terminate() } case MemberRemoved(member, _) if member.address == cluster.selfAddress => log.error("Terminating system, because member has been removed!") context.system.terminate() } private def createConstructrMachine() = { val config = context.system.settings.config def getDuration(key: String) = FiniteDuration(config.getDuration(key).toNanos, NANOSECONDS) val coordinationTimeout = getDuration("constructr.coordination-timeout") val nrOfRetries = config.getInt("constructr.nr-of-retries") val retryDelay = getDuration("constructr.retry-delay") val refreshInterval = getDuration("constructr.refresh-interval") val ttlFactor = config.getDouble("constructr.ttl-factor") val maxNrOfSeedNodes = config.getInt("constructr.max-nr-of-seed-nodes") val joinTimeout = getDuration("constructr.join-timeout") val abortOnJoinTimeout = config.getBoolean("constructr.abort-on-join-timeout") val ignoreRefreshFailures = config.getBoolean("constructr.ignore-refresh-failures") context.actorOf( ConstructrMachine.props( cluster.selfAddress, Coordination(context.system.name, context.system), coordinationTimeout, nrOfRetries, retryDelay, refreshInterval, ttlFactor, if (maxNrOfSeedNodes <= 0) Int.MaxValue else maxNrOfSeedNodes, joinTimeout, abortOnJoinTimeout, ignoreRefreshFailures ), ConstructrMachine.Name ) } } ================================================ FILE: core/src/main/scala/de/heikoseeberger/constructr/ConstructrExtension.scala ================================================ /* * Copyright 2015 Heiko Seeberger * * 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 de.heikoseeberger.constructr import akka.actor.{ ExtendedActorSystem, Extension, ExtensionKey } object ConstructrExtension extends ExtensionKey[ConstructrExtension] final class ConstructrExtension private (system: ExtendedActorSystem) extends Extension { system.systemActorOf(Constructr.props, Constructr.Name) } ================================================ FILE: core/src/main/scala/de/heikoseeberger/constructr/ConstructrMachine.scala ================================================ /* * Copyright 2015 Heiko Seeberger * * 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 de.heikoseeberger.constructr import akka.Done import akka.actor.{ Address, FSM, Props, Status } import akka.cluster.Cluster import akka.cluster.ClusterEvent.{ InitialStateAsEvents, MemberJoined, MemberUp } import akka.pattern.pipe import akka.stream.ActorMaterializer import de.heikoseeberger.constructr.coordination.Coordination import scala.concurrent.duration.{ Duration, FiniteDuration } object ConstructrMachine { implicit class DurationOps(val duration: Duration) extends AnyVal { def toFinite: FiniteDuration = duration match { case Duration(n, unit) => Duration(n, unit) case _ => throw new IllegalStateException("Infinite duration!") } } sealed trait State final object State { case object BeforeGettingNodes extends State case object GettingNodes extends State case object Locking extends State case object Joining extends State case object AddingSelf extends State case object RefreshScheduled extends State case object Refreshing extends State case object RetryScheduled extends State } final case class Data(nodes: Set[Address], retryState: State, nrOfRetriesLeft: Int) final case class StateTimeoutException(state: State) extends RuntimeException(s"State timeout triggered in state $state!") final val Name = "constructr-machine" def props( selfNode: Address, coordination: Coordination, coordinationTimeout: FiniteDuration, coordinationRetries: Int, retryDelay: FiniteDuration, refreshInterval: FiniteDuration, ttlFactor: Double, maxNrOfSeedNodes: Int, joinTimeout: FiniteDuration, abortOnJoinTimeout: Boolean, ignoreRefreshFailures: Boolean ): Props = Props( new ConstructrMachine( selfNode, coordination, coordinationTimeout, coordinationRetries, retryDelay, refreshInterval, ttlFactor, maxNrOfSeedNodes, joinTimeout, abortOnJoinTimeout, ignoreRefreshFailures ) ) } final class ConstructrMachine( val selfNode: Address, coordination: Coordination, coordinationTimeout: FiniteDuration, nrOfRetries: Int, retryDelay: FiniteDuration, refreshInterval: FiniteDuration, ttlFactor: Double, maxNrOfSeedNodes: Int, joinTimeout: FiniteDuration, abortOnJoinTimeout: Boolean, ignoreRefreshFailures: Boolean ) extends FSM[ConstructrMachine.State, ConstructrMachine.Data] { import ConstructrMachine._ import context.dispatcher require(maxNrOfSeedNodes > 0, s"max-nr-of-seed-nodes must be positive, but was $maxNrOfSeedNodes!") require( ttlFactor >= minTtlFactor, s"ttl-factor must be greater or equal 1 + ((coordination-timeout * (1 + nr-of-retries) + retry-delay * nr-of-retries)/ refresh-interval), i.e. $minTtlFactor, but was $ttlFactor!" ) private val cluster = Cluster(context.system) startWith(State.GettingNodes, Data(Set.empty, State.GettingNodes, nrOfRetries)) // Before getting nodes when(State.BeforeGettingNodes, retryDelay) { case Event(StateTimeout, _) => goto(State.GettingNodes).using(Data(Set.empty, State.GettingNodes, nrOfRetries)) } // Getting nodes onTransition { case _ -> State.GettingNodes => log.debug("Transitioning to GettingNodes") coordination.getNodes().map { nodes => if (nodes.contains(selfNode)) log.warning( s"Selfnode received in list of nodes $nodes. Will filter to prevent forming an island." ) nodes.filterNot(_ == selfNode) } pipeTo self } when(State.GettingNodes, coordinationTimeout) { case Event(nodes: Set[Address] @unchecked, _) if nodes.isEmpty => log.debug("Received empty nodes, going to Locking") goto(State.Locking) .using(stateData.copy(nrOfRetriesLeft = nrOfRetries)) case Event(nodes: Set[Address] @unchecked, _) => log.debug(s"Received nodes $nodes, going to Joining") goto(State.Joining) .using(stateData.copy(nodes = nodes, nrOfRetriesLeft = nrOfRetries)) case Event(Status.Failure(cause), _) => log.warning(s"Failure in $stateName, going to GettingNodes: $cause") retry(State.GettingNodes) case Event(StateTimeout, _) => log.warning(s"Timeout in $stateName, going to GettingNodes") retry(State.GettingNodes) } // Locking onTransition { case _ -> State.Locking => log.debug("Transitioning to Locking") val ttl = (2 * maxCoordinationTimeout + joinTimeout) * ttlFactor // Keep lock until self added coordination.lock(selfNode, ttl.toFinite).pipeTo(self) } when(State.Locking, coordinationTimeout) { case Event(true, _) => log.debug("Successfully locked, going to Joining") goto(State.Joining).using( stateData.copy(nodes = Set(selfNode), nrOfRetriesLeft = nrOfRetries) ) case Event(false, _) => log.warning("Couldn't acquire lock, going to GettingNodes") goto(State.BeforeGettingNodes) case Event(Status.Failure(cause), _) => log.warning(s"Failure in $stateName, going to Locking: $cause") retry(State.Locking) case Event(StateTimeout, _) => log.warning(s"Timeout in $stateName, going to Locking") retry(State.Locking) } // Joining onTransition { case _ -> State.Joining => log.debug("Transitioning to Joining") cluster.joinSeedNodes(seedNodes(nextStateData.nodes)) // An existing seed node process would be stopped Cluster(context.system).subscribe(self, InitialStateAsEvents, classOf[MemberJoined], classOf[MemberUp]) } when(State.Joining, joinTimeout) { case Event(MemberJoined(member), _) if member.address == selfNode => goto(State.AddingSelf) case Event(MemberUp(member), _) if member.address == selfNode => goto(State.AddingSelf) case Event(StateTimeout, _) => if (abortOnJoinTimeout) stop(FSM.Failure("Timeout in Joining!")) else goto(State.GettingNodes).using(Data(Set.empty, State.GettingNodes, nrOfRetries)) } onTransition { case State.Joining -> _ => log.debug("Transitioning out of Joining") cluster.unsubscribe(self) } private def seedNodes(nodes: Set[Address]) = nodes.take(maxNrOfSeedNodes).toVector // AddingSelf onTransition { case _ -> State.AddingSelf => log.debug("Transitioning to AddingSelf") coordination .addSelf(selfNode, addingSelfOrRefreshingTtl.toFinite) .pipeTo(self) } when(State.AddingSelf, coordinationTimeout) { case Event(Done, data) => log.debug("Successfully added self, going to RefreshScheduled") goto(State.RefreshScheduled) .using(data.copy(nrOfRetriesLeft = nrOfRetries)) case Event(Status.Failure(cause), _) => log.warning(s"Failure in $stateName, going to AddingSelf: $cause") retry(State.AddingSelf) case Event(StateTimeout, _) => log.warning(s"Timeout in $stateName, going to AddingSelf") retry(State.AddingSelf) } // RefreshScheduled onTransition { case _ -> State.RefreshScheduled => log.debug("Transitioning to RefreshScheduled") } when(State.RefreshScheduled, refreshInterval) { case Event(StateTimeout, _) => log.debug(s"Waited for $refreshInterval, going to Refreshing") goto(State.Refreshing) } // Refreshing onTransition { case _ -> State.Refreshing => log.debug(s"Transitioning to Refreshing") coordination .refresh(selfNode, addingSelfOrRefreshingTtl.toFinite) .pipeTo(self) } when(State.Refreshing, coordinationTimeout) { case Event(Done, _) => log.debug("Successfully refreshed, going to RefreshScheduled") goto(State.RefreshScheduled) .using(stateData.copy(nrOfRetriesLeft = nrOfRetries)) case Event(Status.Failure(cause), _) => log.warning(s"Failure in $stateName, going to Refreshing: $cause") retryRefreshing() case Event(StateTimeout, _) => log.warning(s"Timeout in $stateName, going to Refreshing") retryRefreshing() } // RetryScheduled onTransition { case state -> State.RetryScheduled => log.debug(s"Transitioning from $state to RetryScheduled") } when(State.RetryScheduled, retryDelay) { case Event(StateTimeout, Data(_, retryState, _)) => log.debug(s"Waited for $retryDelay, going to $retryState") goto(retryState) } // Unhandled events whenUnhandled { case Event(MemberJoined(member), _) if member.address == selfNode && isPreJoining => goto(State.AddingSelf).using(stateData.copy(nrOfRetriesLeft = nrOfRetries)) case Event(MemberUp(member), _) if member.address == selfNode && isPreJoining => goto(State.AddingSelf).using(stateData.copy(nrOfRetriesLeft = nrOfRetries)) // Unsubscribe might be late case Event(MemberJoined(_) | MemberUp(_), _) => stay() } // Initialization initialize() // Helpers private def retry(retryState: ConstructrMachine.State) = if (stateData.nrOfRetriesLeft <= 0) stop(FSM.Failure(s"Number of retries exhausted in $stateName!")) else goto(State.RetryScheduled).using( stateData.copy(retryState = retryState, nrOfRetriesLeft = stateData.nrOfRetriesLeft - 1) ) private def maxCoordinationTimeout = coordinationTimeout * (1 + nrOfRetries) + retryDelay * nrOfRetries private def minTtlFactor = 1 + maxCoordinationTimeout / refreshInterval private def addingSelfOrRefreshingTtl = refreshInterval * ttlFactor private def retryRefreshing() = if (ignoreRefreshFailures) goto(State.RetryScheduled).using( stateData.copy(retryState = State.Refreshing, nrOfRetriesLeft = nrOfRetries) ) else retry(State.Refreshing) private def isPreJoining: Boolean = stateName match { case State.BeforeGettingNodes | State.GettingNodes | State.Locking => true case _ => false } } ================================================ FILE: core/src/main/scala/de/heikoseeberger/constructr/package.scala ================================================ /* * Copyright 2015 Heiko Seeberger * * 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 de.heikoseeberger package object constructr { type Traversable[+A] = scala.collection.immutable.Traversable[A] type Iterable[+A] = scala.collection.immutable.Iterable[A] type Seq[+A] = scala.collection.immutable.Seq[A] type IndexedSeq[+A] = scala.collection.immutable.IndexedSeq[A] } ================================================ FILE: core/src/multi-jvm/resources/application.conf ================================================ akka.actor.provider = akka.cluster.ClusterActorRefProvider ================================================ FILE: core/src/multi-jvm/resources/log4j2.xml ================================================ %date{HH:mm:ss} %-5level %logger{0} [%X{akkaSource}] - %msg%n %date{HH:mm:ss} %-5level %logger{0} [%X{akkaSource}] - %msg%n ================================================ FILE: core/src/multi-jvm/scala/de/heikoseeberger/constructr/MultiNodeConstructrSpec.scala ================================================ /* * Copyright 2015 Heiko Seeberger * * 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 de.heikoseeberger.constructr import akka.actor.ActorDSL.{ actor, Act } import akka.actor.Address import akka.cluster.{ Cluster, ClusterEvent } import akka.http.scaladsl.Http import akka.http.scaladsl.client.RequestBuilding import akka.http.scaladsl.model.StatusCodes.{ NotFound, OK } import akka.http.scaladsl.unmarshalling.Unmarshal import akka.pattern.ask import akka.remote.testkit.{ MultiNodeConfig, MultiNodeSpec } import akka.stream.ActorMaterializer import akka.testkit.TestDuration import akka.util.Timeout import com.typesafe.config.ConfigFactory import org.scalatest.{ BeforeAndAfterAll, FreeSpecLike, Matchers } import scala.concurrent.Await import scala.concurrent.duration.DurationInt object ConstructrMultiNodeConfig { val coordinationHost = { val dockerHostPattern = """tcp://(\S+):\d{1,5}""".r sys.env .get("DOCKER_HOST") .collect { case dockerHostPattern(address) => address } .getOrElse("127.0.0.1") } } class ConstructrMultiNodeConfig(coordinationPort: Int) extends MultiNodeConfig { import ConstructrMultiNodeConfig._ commonConfig(ConfigFactory.load()) for (n <- 1.to(5)) { val port = 2550 + n nodeConfig(role(port.toString))( ConfigFactory.parseString( s"""|akka.actor.provider = akka.cluster.ClusterActorRefProvider |akka.remote.netty.tcp.hostname = "127.0.0.1" |akka.remote.netty.tcp.port = $port |constructr.coordination.host = $coordinationHost |constructr.coordination.port = $coordinationPort |""".stripMargin ) ) } } abstract class MultiNodeConstructrSpec( coordinationPort: Int, delete: String, get: String, toNodes: String => Set[Address] ) extends MultiNodeSpec(new ConstructrMultiNodeConfig(coordinationPort)) with FreeSpecLike with Matchers with BeforeAndAfterAll { import ConstructrMultiNodeConfig._ import RequestBuilding._ import system.dispatcher implicit val mat = ActorMaterializer() "Constructr should manage an Akka cluster" in { runOn(roles.head) { within(20.seconds.dilated) { awaitAssert { val coordinationStatus = Await.result( Http() .singleRequest( Delete(s"http://$coordinationHost:$coordinationPort$delete") ) .map(_.status), 5.seconds.dilated // As this is the first request fired via `singleRequest`, creating the pool takes some time (probably) ) coordinationStatus should (be(OK) or be(NotFound)) } } } enterBarrier("coordination-started") ConstructrExtension(system) val listener = actor(new Act { import ClusterEvent._ var isMember = false Cluster(context.system).subscribe(self, InitialStateAsEvents, classOf[MemberJoined], classOf[MemberUp]) become { case "isMember" => sender() ! isMember case MemberJoined(member) if member.address == Cluster(context.system).selfAddress => isMember = true case MemberUp(member) if member.address == Cluster(context.system).selfAddress => isMember = true } }) within(20.seconds.dilated) { awaitAssert { implicit val timeout = Timeout(1.second.dilated) val isMember = Await.result((listener ? "isMember").mapTo[Boolean], 1.second.dilated) isMember shouldBe true } } enterBarrier("cluster-formed") within(5.seconds.dilated) { awaitAssert { val constructrNodes = Await.result( Http() .singleRequest( Get(s"http://$coordinationHost:$coordinationPort$get") ) .flatMap(Unmarshal(_).to[String].map(toNodes)), 1.second.dilated ) val ports = constructrNodes.flatMap(_.port) ports shouldBe roles.to[Set].map(_.name.toInt) } } enterBarrier("done") } override def initialParticipants = roles.size override protected def beforeAll() = { super.beforeAll() multiNodeSpecBeforeAll() } override protected def afterAll() = { multiNodeSpecAfterAll() super.afterAll() } } ================================================ FILE: core/src/multi-jvm/scala/de/heikoseeberger/constructr/MultiNodeEtcdConstructrSpec.scala ================================================ /* * Copyright 2015 Heiko Seeberger * * 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 de.heikoseeberger.constructr import akka.actor.{ Address, AddressFromURIString } import io.circe.Json import io.circe.parser.parse import java.util.Base64 class MultiNodeEtcdConstructrSpecMultiJvmNode1 extends MultiNodeEtcdConstructrSpec class MultiNodeEtcdConstructrSpecMultiJvmNode2 extends MultiNodeEtcdConstructrSpec class MultiNodeEtcdConstructrSpecMultiJvmNode3 extends MultiNodeEtcdConstructrSpec class MultiNodeEtcdConstructrSpecMultiJvmNode4 extends MultiNodeEtcdConstructrSpec class MultiNodeEtcdConstructrSpecMultiJvmNode5 extends MultiNodeEtcdConstructrSpec object MultiNodeEtcdConstructrSpec { def toNodes(s: String): Set[Address] = { def jsonToNode(json: Json) = { val key = json.hcursor .get[String]("key") .fold(throw _, identity) .stripPrefix("/constructr/MultiNodeConstructrSpec/nodes/") AddressFromURIString(new String(Base64.getUrlDecoder.decode(key))) } import cats.syntax.either._ // for Scala 2.11 parse(s) .fold(throw _, identity) .hcursor .downField("node") .get[Set[Json]]("nodes") .getOrElse(Set.empty) .map(jsonToNode) } } abstract class MultiNodeEtcdConstructrSpec extends MultiNodeConstructrSpec( 2379, "/v2/keys/constructr?recursive=true", "/v2/keys/constructr/MultiNodeConstructrSpec/nodes", MultiNodeEtcdConstructrSpec.toNodes ) ================================================ FILE: core/src/test/resources/application.conf ================================================ akka.actor.provider = akka.cluster.ClusterActorRefProvider ================================================ FILE: core/src/test/scala/de/heikoseeberger/constructr/ConstructrExtensionSpec.scala ================================================ /* * Copyright 2015 Heiko Seeberger * * 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 de.heikoseeberger.constructr import java.util.UUID import akka.actor.ActorSystem import akka.cluster.{ Cluster, MemberStatus } import com.typesafe.config.ConfigFactory import de.heikoseeberger.constructr.testutil.CoordinationInfo import org.scalatest.concurrent.Eventually import org.scalatest.mockito.MockitoSugar import org.scalatest.time._ import org.scalatest.{ BeforeAndAfterEach, Matchers, WordSpec } import scala.concurrent.duration._ import scala.concurrent.{ Await, ExecutionContext, Future } class ConstructrExtensionSpec extends WordSpec with Matchers with MockitoSugar with BeforeAndAfterEach with Eventually { import ConstructrExtensionSpec._ private[this] var clusterNodes = Seq.empty[ActorSystem] override protected def afterEach(): Unit = dispose(clusterNodes) "Cluster members managed by ConstructR" should { // Happy path "successfully join the cluster under normal circumstances" in { val clusterName = generateClusterName() clusterNodes = 0.until(5).map(i => createClusterNode(clusterName, 15000 + i)) eventuallyUp(clusterNodes, 10.seconds) } /* * An initial set of nodes joins the cluster and crashes, thus leaving the corresponding seed entries at * the backend. A second set of nodes attempts to join the cluster prior to the expiration of the previous * seed entries, thus initiating join attempts to seed nodes that are no longer alive. These attempts will * continue to fail, until the original seed entries expire, and one of the new nodes manages to register * itself as the new seed and formulate a cluster. After that the rest of the nodes will eventually join * as well. */ "eventually join the cluster if initial seeds crash" in { val clusterName = generateClusterName() val basePort = 15005 clusterNodes = 0.until(1).map(i => createClusterNode(clusterName, basePort + i)) eventuallyUp(clusterNodes, 10.seconds) dispose(clusterNodes) clusterNodes = 1.until(5).map(i => createClusterNode(clusterName, basePort + i)) Thread.sleep(20.seconds.toMillis) for (clusterNode <- clusterNodes) { val clusterExtension = Cluster(clusterNode) assert(clusterExtension.selfMember.status != MemberStatus.Up, s"node ${clusterExtension.selfAddress} is up") } eventuallyUp(clusterNodes, 40.seconds) } /* * An initial set of nodes joins the cluster and crashes, thus leaving the corresponding seed entries at * the backend. A second set of nodes attempts to join the cluster prior to the expiration of the previous * seed entries, thus initiating join attempts to seed nodes that are no longer alive. These attempts will * continue to fail for a while, until the original set of nodes is restarted, and successfully formulates * a cluster. After that the rest of the nodes will eventually join as well. */ "correctly join initial seeds if they crash but recover in time" in { val clusterName = generateClusterName() val basePort = 15010 clusterNodes = 0.until(1).map(i => createClusterNode(clusterName, basePort + i)) eventuallyUp(clusterNodes, 10.seconds) dispose(clusterNodes) clusterNodes = 1.until(5).map(i => createClusterNode(clusterName, basePort + i)) Thread.sleep(10.seconds.toMillis) for (clusterNode <- clusterNodes) { val clusterExtension = Cluster(clusterNode) assert(clusterExtension.selfMember.status != MemberStatus.Up, s"node ${clusterExtension.selfAddress} is up") } clusterNodes = createClusterNode(clusterName, basePort) +: clusterNodes eventuallyUp(clusterNodes, 10.seconds) } } private def eventuallyUp(cluster: scala.Seq[ActorSystem], within: FiniteDuration): Unit = eventually(timeout(Span(within.toSeconds, Seconds)), interval(Span(2, Seconds))) { for (clusterNode <- cluster) { val clusterExtension = Cluster(clusterNode) assert(clusterExtension.selfMember.status == MemberStatus.Up, s"node ${clusterExtension.selfAddress} is not up") assert(clusterExtension.state.members.size == cluster.size) } } } object ConstructrExtensionSpec { val ClusterNameBase: String = "ConstructrExtensionSpecCluster" def generateClusterName(): String = s"$ClusterNameBase-${UUID.randomUUID()}" def createClusterNode(name: String, port: Int): ActorSystem = { val config = ConfigFactory.parseString(s""" | akka { | actor.provider = akka.cluster.ClusterActorRefProvider | cluster.jmx.multi-mbeans-in-same-jvm = on | | remote { | netty.tcp { | hostname = "127.0.0.1" | port = $port | } | } | } | | constructr { | coordination { | host = "${CoordinationInfo.host}" | port = ${CoordinationInfo.port} | } | | coordination-timeout = 2 seconds | join-timeout = 3 seconds | abort-on-join-timeout = false | nr-of-retries = 1 | retry-delay = 2 seconds | refresh-interval = 6 seconds | } """.stripMargin) val system = ActorSystem(name, config) ConstructrExtension(system) system } def dispose(clusterNodes: scala.Seq[ActorSystem]): Unit = if (clusterNodes.nonEmpty) { implicit val executor = ExecutionContext.Implicits.global Await.result(Future.traverse(clusterNodes)(_.terminate()), 20.seconds) } } ================================================ FILE: core/src/test/scala/de/heikoseeberger/constructr/ConstructrMachineSpec.scala ================================================ /* * Copyright 2015 Heiko Seeberger * * 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 de.heikoseeberger.constructr import akka.Done import akka.actor.{ ActorSystem, Address, FSM, Props } import akka.cluster.Cluster import akka.pattern.{ after => delayed } import akka.stream.ActorMaterializer import akka.testkit.{ TestDuration, TestProbe } import de.heikoseeberger.constructr.coordination.Coordination import org.mockito.Mockito import org.scalatest.{ BeforeAndAfterAll, Matchers, WordSpec } import scala.concurrent.duration.{ Duration, DurationInt } import scala.concurrent.{ Await, Future } final class ConstructrMachineSpec extends WordSpec with Matchers with BeforeAndAfterAll { import ConstructrMachine._ import Mockito._ private implicit val system = ActorSystem() private implicit val mat = ActorMaterializer() import system.dispatcher private val address = Cluster(system).selfAddress "ConstructrMachine" should { "retry the given number of retries and then fail" in { val coordination = mock(classOf[Coordination]) when(coordination.getNodes()).thenReturn( // delay first getNodes call for a bit, so as not to transition out of GettingNodes state too fast delayed(50.millis.dilated, system.scheduler)(boom()), delayed(1.hour.dilated, system.scheduler)(noNodes()) ) val monitor = TestProbe() val machine = system.actorOf( Props( new ConstructrMachine( selfNode = address, coordination = coordination, coordinationTimeout = 100.millis.dilated, nrOfRetries = 1, retryDelay = 100.millis.dilated, refreshInterval = 1.second.dilated, ttlFactor = 1.5, maxNrOfSeedNodes = 3, joinTimeout = 100.millis.dilated, abortOnJoinTimeout = false, ignoreRefreshFailures = false ) ) ) machine ! FSM.SubscribeTransitionCallBack(monitor.ref) monitor.watch(machine) monitor.expectMsgPF(hint = "Current state GettingNodes") { case FSM.CurrentState(_, State.GettingNodes) => () } monitor.expectMsgPF(hint = "GettingNodes -> RetryScheduled") { case FSM.Transition(_, State.GettingNodes, State.RetryScheduled) => () } monitor.expectMsgPF(hint = "RetryScheduled -> GettingNodes") { case FSM.Transition(_, State.RetryScheduled, State.GettingNodes) => () } monitor.expectTerminated(machine) } "correctly work down the happy path (including retries)" in { val coordination = mock(classOf[Coordination]) when(coordination.getNodes()).thenReturn( delayed(1.hour.dilated, system.scheduler)(noNodes()), boom(), noNodes(), noNodes() ) when(coordination.lock(address, 1650.millis.dilated)).thenReturn( delayed(1.hour.dilated, system.scheduler)(boom()), boom(), Future.successful(false), Future.successful(true) ) when(coordination.addSelf(address, 1500.millis.dilated)).thenReturn( delayed(1.hour.dilated, system.scheduler)(boom()), boom(), Future.successful(Done) ) when(coordination.refresh(address, 1500.millis.dilated)).thenReturn( delayed(1.hour.dilated, system.scheduler)(boom()), boom(), Future.successful(Done) ) val monitor = TestProbe() val machine = system.actorOf( Props( new ConstructrMachine( selfNode = address, coordination = coordination, coordinationTimeout = 100.millis.dilated, nrOfRetries = 2, retryDelay = 100.millis.dilated, refreshInterval = 1.second.dilated, ttlFactor = 1.5, maxNrOfSeedNodes = 3, joinTimeout = 100.millis.dilated, abortOnJoinTimeout = false, ignoreRefreshFailures = false ) ) ) machine ! FSM.SubscribeTransitionCallBack(monitor.ref) monitor.expectMsgPF(hint = "Current state GettingNodes") { case FSM.CurrentState(_, State.GettingNodes) => () } monitor.expectMsgPF(hint = "GettingNodes -> RetryScheduled") { case FSM.Transition(_, State.GettingNodes, State.RetryScheduled) => () } monitor.expectMsgPF(hint = "RetryScheduled -> GettingNodes") { case FSM.Transition(_, State.RetryScheduled, State.GettingNodes) => () } monitor.expectMsgPF(hint = "GettingNodes -> RetryScheduled") { case FSM.Transition(_, State.GettingNodes, State.RetryScheduled) => () } monitor.expectMsgPF(hint = "RetryScheduled -> GettingNodes") { case FSM.Transition(_, State.RetryScheduled, State.GettingNodes) => () } monitor.expectMsgPF(hint = "GettingNodes -> Locking") { case FSM.Transition(_, State.GettingNodes, State.Locking) => () } monitor.expectMsgPF(hint = "Locking -> RetryScheduled") { case FSM.Transition(_, State.Locking, State.RetryScheduled) => () } monitor.expectMsgPF(hint = "RetryScheduled -> Locking") { case FSM.Transition(_, State.RetryScheduled, State.Locking) => () } monitor.expectMsgPF(hint = "Locking -> RetryScheduled") { case FSM.Transition(_, State.Locking, State.RetryScheduled) => () } monitor.expectMsgPF(hint = "RetryScheduled -> Locking") { case FSM.Transition(_, State.RetryScheduled, State.Locking) => () } monitor.expectMsgPF(hint = "Locking -> BeforeGettingNodes") { case FSM.Transition(_, State.Locking, State.BeforeGettingNodes) => () } monitor.expectMsgPF(hint = "BeforeGettingNodes -> GettingNodes") { case FSM.Transition(_, State.BeforeGettingNodes, State.GettingNodes) => () } monitor.expectMsgPF(hint = "GettingNodes -> Locking") { case FSM.Transition(_, State.GettingNodes, State.Locking) => () } monitor.expectMsgPF(hint = "Locking -> Joining") { case FSM.Transition(_, State.Locking, State.Joining) => () } monitor.expectMsgPF(hint = "Joining -> AddingSelf") { case FSM.Transition(_, State.Joining, State.AddingSelf) => () } monitor.expectMsgPF(hint = "AddingSelf -> RetryScheduled") { case FSM.Transition(_, State.AddingSelf, State.RetryScheduled) => () } monitor.expectMsgPF(hint = "RetryScheduled -> AddingSelf") { case FSM.Transition(_, State.RetryScheduled, State.AddingSelf) => () } monitor.expectMsgPF(hint = "AddingSelf -> RetryScheduled") { case FSM.Transition(_, State.AddingSelf, State.RetryScheduled) => () } monitor.expectMsgPF(hint = "RetryScheduled -> AddingSelf") { case FSM.Transition(_, State.RetryScheduled, State.AddingSelf) => () } monitor.expectMsgPF(hint = "AddingSelf -> RefreshScheduled") { case FSM.Transition(_, State.AddingSelf, State.RefreshScheduled) => () } monitor.expectMsgPF(hint = "RefreshScheduled -> Refreshing") { case FSM.Transition(_, State.RefreshScheduled, State.Refreshing) => () } monitor.expectMsgPF(hint = "Refreshing -> RetryScheduled") { case FSM.Transition(_, State.Refreshing, State.RetryScheduled) => () } monitor.expectMsgPF(hint = "RetryScheduled -> Refreshing") { case FSM.Transition(_, State.RetryScheduled, State.Refreshing) => () } monitor.expectMsgPF(hint = "Refreshing -> RetryScheduled") { case FSM.Transition(_, State.Refreshing, State.RetryScheduled) => () } monitor.expectMsgPF(hint = "RetryScheduled -> Refreshing") { case FSM.Transition(_, State.RetryScheduled, State.Refreshing) => () } monitor.expectMsgPF(hint = "Refreshing -> RefreshScheduled") { case FSM.Transition(_, State.Refreshing, State.RefreshScheduled) => () } } "machine won't terminate on exceeded number of retries in Refreshing (if it's specified in configuration)" in { val coordination = mock(classOf[Coordination]) when(coordination.getNodes()).thenReturn( // delay first getNodes call for a bit, so as not to transition out of GettingNodes state too fast delayed(50.millis.dilated, system.scheduler)(noNodes()) ) when(coordination.lock(address, 1650.millis.dilated)).thenReturn( Future.successful(true) ) when(coordination.addSelf(address, 1500.millis.dilated)).thenReturn( Future.successful(Done) ) when(coordination.refresh(address, 1500.millis.dilated)).thenReturn( Future.successful(Done), delayed(1.hour.dilated, system.scheduler)(boom()), boom(), boom(), Future.successful(Done) ) val nrOfRetries = 2 val monitor = TestProbe() val machine = system.actorOf( Props( new ConstructrMachine( selfNode = address, coordination = coordination, coordinationTimeout = 100.millis.dilated, nrOfRetries = nrOfRetries, retryDelay = 100.millis.dilated, refreshInterval = 1.second.dilated, ttlFactor = 1.5, maxNrOfSeedNodes = 3, joinTimeout = 100.millis.dilated, abortOnJoinTimeout = false, ignoreRefreshFailures = true ) ) ) machine ! FSM.SubscribeTransitionCallBack(monitor.ref) monitor.expectMsgPF(hint = "Current state GettingNodes") { case FSM.CurrentState(_, State.GettingNodes) => () } monitor.expectMsgPF(hint = "GettingNodes -> Locking") { case FSM.Transition(_, State.GettingNodes, State.Locking) => () } monitor.expectMsgPF(hint = "Locking -> Joining") { case FSM.Transition(_, State.Locking, State.Joining) => () } monitor.expectMsgPF(hint = "Joining -> AddingSelf") { case FSM.Transition(_, State.Joining, State.AddingSelf) => () } monitor.expectMsgPF(hint = "AddingSelf -> RefreshScheduled") { case FSM.Transition(_, State.AddingSelf, State.RefreshScheduled) => () } monitor.expectMsgPF(hint = "RefreshScheduled -> Refreshing") { case FSM.Transition(_, State.RefreshScheduled, State.Refreshing) => () } monitor.expectMsgPF(hint = "Refreshing -> RefreshScheduled") { case FSM.Transition(_, State.Refreshing, State.RefreshScheduled) => () } monitor.expectMsgPF(hint = "RefreshScheduled -> Refreshing") { case FSM.Transition(_, State.RefreshScheduled, State.Refreshing) => () } (1 to nrOfRetries + 1) foreach { _ => monitor.expectMsgPF(hint = "Refreshing -> RetryScheduled") { case FSM.Transition(_, State.Refreshing, State.RetryScheduled) => () } monitor.expectMsgPF(hint = "RetryScheduled -> Refreshing") { case FSM.Transition(_, State.RetryScheduled, State.Refreshing) => () } } monitor.expectMsgPF(hint = "Refreshing -> RefreshScheduled") { case FSM.Transition(_, State.Refreshing, State.RefreshScheduled) => () } } } override protected def afterAll(): Unit = { Await.ready(system.terminate, Duration.Inf) super.afterAll() } private def boom() = Future.failed(new Exception("BOOM")) private def noNodes() = Future.successful(Set.empty[Address]) } ================================================ FILE: core/src/test/scala/de/heikoseeberger/constructr/testutil/CoordinationInfo.scala ================================================ /* * Copyright 2015 Heiko Seeberger * * 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 de.heikoseeberger.constructr.testutil object CoordinationInfo { def host: String = { val dockerHostPattern = """tcp://(\S+):\d{1,5}""".r sys.env .get("DOCKER_HOST") .collect({ case dockerHostPattern(address) => address }) .getOrElse("127.0.0.1") } def port: Int = 2379 } ================================================ FILE: project/build.properties ================================================ sbt.version = 1.1.1 ================================================ FILE: project/plugins.sbt ================================================ addSbtPlugin("com.dwijnand" % "sbt-travisci" % "1.1.1") addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.1.0") addSbtPlugin("com.lucidchart" % "sbt-scalafmt" % "1.14") addSbtPlugin("com.typesafe.sbt" % "sbt-git" % "0.9.3") addSbtPlugin("com.typesafe.sbt" % "sbt-multi-jvm" % "0.4.0") addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.0.0") addSbtPlugin("org.foundweekends" % "sbt-bintray" % "0.5.1") libraryDependencies += "org.slf4j" % "slf4j-nop" % "1.7.25" // Needed by sbt-git ================================================ FILE: shell-prompt.sbt ================================================ shellPrompt.in(ThisBuild) := { state => val project = Project.extract(state).currentRef.project s"[$project]> " }