├── .gitignore ├── LICENSE ├── README.md ├── core ├── build.sbt └── src │ ├── main │ └── scala │ │ ├── Repository.scala │ │ ├── ToDo.scala │ │ ├── ToDoConfig.scala │ │ └── package.scala │ └── test │ └── scala │ └── ToDoSpec.scala ├── http ├── build.sbt └── src │ └── main │ ├── resources │ └── todo.cfg │ └── scala │ ├── Main.scala │ └── Service.scala ├── project.sbt └── project ├── build.properties └── plugins.sbt /.gitignore: -------------------------------------------------------------------------------- 1 | *.class 2 | *.log 3 | 4 | # sbt specific 5 | .cache 6 | .history 7 | .lib/ 8 | dist/* 9 | target/ 10 | lib_managed/ 11 | src_managed/ 12 | project/boot/ 13 | project/plugins/project/ 14 | 15 | # Scala-IDE specific 16 | .scala_dependencies 17 | .worksheet 18 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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-------------------------------------------------------------------------------- https://raw.githubusercontent.com/timperrett/functional-microservice-example/a2bf6daa5de90250278b06bf34d6c5d134b5fe4b/README.md -------------------------------------------------------------------------------- /core/build.sbt: -------------------------------------------------------------------------------- 1 | 2 | libraryDependencies ++= Seq( 3 | "org.scalaz" %% "scalaz-core" % "7.1.2", 4 | "org.scalaz" %% "scalaz-concurrent" % "7.1.2", 5 | "org.tpolecat" %% "doobie-core" % "0.2.2", 6 | "org.tpolecat" %% "doobie-contrib-h2" % "0.2.2", 7 | "org.scalatest" %% "scalatest" % "2.2.5" % "test" 8 | ) 9 | -------------------------------------------------------------------------------- /core/src/main/scala/Repository.scala: -------------------------------------------------------------------------------- 1 | package example 2 | 3 | import scalaz.Monad 4 | import scalaz.syntax.monad._ 5 | import scalaz.concurrent.Task 6 | 7 | import doobie.imports._ 8 | import doobie.contrib.h2.h2types._ 9 | 10 | abstract class Repository[M[_] : Monad] { 11 | def list: M[List[Item]] 12 | def create(item: Item): M[Item.Id] 13 | } 14 | 15 | class InMemoryRepository extends Repository[Task] with DAO { 16 | 17 | // An in-memory database 18 | val xa = DriverManagerTransactor[Task]( 19 | "org.h2.Driver", "jdbc:h2:mem:todo;DB_CLOSE_DELAY=-1", "sa", "" 20 | ) 21 | 22 | def list: Task[List[Item]] = 23 | withInit(allItems.list).transact(xa) 24 | 25 | def create(item: Item): Task[Item.Id] = 26 | withInit(insertItem(item).run).transact(xa).as(item.id) 27 | 28 | } 29 | 30 | trait DAO { 31 | 32 | // On table not found, init the db and try again 33 | def withInit[A](a: ConnectionIO[A]): ConnectionIO[A] = 34 | a.exceptSomeSqlState { 35 | case SqlState("42S02") => init.run *> a 36 | } 37 | 38 | def allItems: Query0[Item] = 39 | sql""" 40 | SELECT id, content, created_at 41 | FROM items 42 | ORDER BY created_at ASC 43 | """.query[Item] 44 | 45 | def insertItem(item: Item): Update0 = 46 | sql""" 47 | INSERT INTO items (id, content, created_at) 48 | VALUES (${item.id}, ${item.content}, ${item.createdAt}) 49 | """.update 50 | 51 | def init: Update0 = 52 | sql""" 53 | CREATE TABLE items ( 54 | id UUID PRIMARY KEY, 55 | content VARCHAR NOT NULL, 56 | created_at LONG NOT NULL 57 | ) 58 | """.update 59 | 60 | } 61 | 62 | 63 | -------------------------------------------------------------------------------- /core/src/main/scala/ToDo.scala: -------------------------------------------------------------------------------- 1 | package example 2 | 3 | import java.util.UUID 4 | import scalaz.{\/,-\/,\/-,Kleisli} 5 | import scalaz.concurrent.Task 6 | import scalaz.syntax.kleisli._ 7 | 8 | object Item { 9 | type Id = UUID 10 | } 11 | case class Item( 12 | id: Item.Id, 13 | content: String, 14 | createdAt: Long) 15 | 16 | class ToDo { 17 | type TConfig = ToDoConfig[Task] 18 | type ToDoK[A] = Kleisli[Task, TConfig, A] 19 | 20 | protected def config: ToDoK[TConfig] = 21 | Kleisli.ask[Task, TConfig] 22 | 23 | protected val currentTimeMillis: ToDoK[Long] = 24 | Task.delay(System.currentTimeMillis).liftKleisli 25 | 26 | protected val randomUUID: ToDoK[UUID] = 27 | Task.delay(UUID.randomUUID).liftKleisli 28 | 29 | def create(content: String): ToDoK[Item.Id] = { 30 | for { 31 | a <- config 32 | u <- randomUUID 33 | t <- currentTimeMillis 34 | i = Item(u, content, t) 35 | b <- a.repository.create(i).liftKleisli 36 | } yield b 37 | } 38 | 39 | def list: ToDoK[List[Item]] = 40 | for { 41 | a <- config 42 | b <- a.repository.list.liftKleisli 43 | } yield b 44 | } 45 | 46 | -------------------------------------------------------------------------------- /core/src/main/scala/ToDoConfig.scala: -------------------------------------------------------------------------------- 1 | package example 2 | 3 | case class ToDoConfig[M[_]]( 4 | maximumToDos: Int, 5 | repository: Repository[M] 6 | ) 7 | -------------------------------------------------------------------------------- /core/src/main/scala/package.scala: -------------------------------------------------------------------------------- 1 | package object example { 2 | 3 | import annotation.tailrec 4 | import java.util.concurrent.atomic.AtomicReference 5 | 6 | implicit class Atomic[A](val atomic: AtomicReference[A]){ 7 | @tailrec final def update(f: A => A): A = { 8 | val oldValue = atomic.get() 9 | val newValue = f(oldValue) 10 | if (atomic.compareAndSet(oldValue, newValue)) newValue else update(f) 11 | } 12 | 13 | def get: A = atomic.get 14 | } 15 | } 16 | -------------------------------------------------------------------------------- /core/src/test/scala/ToDoSpec.scala: -------------------------------------------------------------------------------- 1 | package example 2 | 3 | import org.scalatest.{FlatSpec,Matchers} 4 | 5 | class ToDoSpec extends FlatSpec with Matchers { 6 | 7 | val config = Config( 8 | maximumToDos = 10, 9 | repository = new InMemoryRepository) 10 | 11 | val todo = new ToDo 12 | 13 | it must "foo" in { 14 | todo.list(config).run should equal (Nil) 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /http/build.sbt: -------------------------------------------------------------------------------- 1 | 2 | libraryDependencies ++= Seq( 3 | "oncue.knobs" %% "core" % "3.2.0", 4 | "org.http4s" %% "http4s-server" % "0.7.0", 5 | "org.http4s" %% "http4s-dsl" % "0.7.0", 6 | "org.http4s" %% "http4s-blazeserver" % "0.7.0", 7 | "ch.qos.logback" % "logback-classic" % "1.1.3" 8 | ) 9 | -------------------------------------------------------------------------------- /http/src/main/resources/todo.cfg: -------------------------------------------------------------------------------- 1 | todo { 2 | maximum-item-count = 10 3 | } 4 | -------------------------------------------------------------------------------- /http/src/main/scala/Main.scala: -------------------------------------------------------------------------------- 1 | package example 2 | 3 | import org.http4s.server.blaze.BlazeBuilder 4 | import java.io.File 5 | import knobs._ 6 | 7 | object Main { 8 | def main(args: Array[String]): Unit = { 9 | 10 | val cfg = knobs.loadImmutable(Required( 11 | FileResource(new File("/etc/todo/service.cfg")) or 12 | ClassPathResource("todo.cfg")) :: Nil).run 13 | 14 | val config = ToDoConfig( 15 | maximumToDos = cfg.require[Int]("todo.maximum-item-count"), 16 | repository = new InMemoryRepository 17 | ) 18 | 19 | val todo = new ToDo 20 | 21 | BlazeBuilder.bindHttp(8080) 22 | .mountService(ToDoService.service(todo)(config), "/") 23 | .run 24 | .awaitShutdown() 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /http/src/main/scala/Service.scala: -------------------------------------------------------------------------------- 1 | package example 2 | 3 | import org.http4s._ 4 | import org.http4s.dsl._ 5 | import org.http4s.server._ 6 | import scalaz.concurrent.Task 7 | 8 | object ToDoService { 9 | import scala.concurrent.ExecutionContext 10 | 11 | def service(todo: ToDo)(config: todo.TConfig)(implicit executionContext: ExecutionContext = ExecutionContext.global) = 12 | HttpService { 13 | case req @ GET -> Root => 14 | Ok("Hello, World") 15 | 16 | case GET -> Root / "list" => Ok("not implemented") 17 | todo.list(config).map(Ok(_)) 18 | 19 | case req @ POST -> Root / "create" => 20 | req.decode[UrlForm] { data => 21 | data.values.get("content").flatMap(_.headOption) match { 22 | case Some(a) => todo.create(a)(config).map(Ok(_)) 23 | case None => Task.now(BadRequest("dsfds")) 24 | } 25 | } 26 | 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /project.sbt: -------------------------------------------------------------------------------- 1 | 2 | organization in Global := "com.timperrett.example" 3 | 4 | scalaVersion in Global := "2.11.6" 5 | 6 | resolvers in Global ++= Seq( 7 | Resolver.bintrayRepo("oncue", "releases"), 8 | Resolver.bintrayRepo("scalaz", "releases"), 9 | "sonatype.oss" at "https://oss.sonatype.org/content/repositories/releases", 10 | "tpolecat" at "http://dl.bintray.com/tpolecat/maven" 11 | ) 12 | 13 | lazy val example = project.in(file(".")).aggregate( 14 | core, 15 | http 16 | ) 17 | 18 | lazy val core = project 19 | 20 | lazy val http = project.dependsOn(core) 21 | -------------------------------------------------------------------------------- /project/build.properties: -------------------------------------------------------------------------------- 1 | sbt.version=0.13.8 2 | -------------------------------------------------------------------------------- /project/plugins.sbt: -------------------------------------------------------------------------------- 1 | 2 | resolvers += Resolver.url( 3 | "bintray-sbt-plugin-releases", 4 | url("http://dl.bintray.com/content/sbt/sbt-plugin-releases"))( 5 | Resolver.ivyStylePatterns) 6 | 7 | addSbtPlugin("me.lessis" % "bintray-sbt" % "0.3.0") 8 | --------------------------------------------------------------------------------