├── .gitignore
├── project
    ├── build.properties
    └── plugins.sbt
├── .vscode
    └── settings.json
├── README.md
└── src
    └── main
        └── scala
            └── example
                └── EmberExample.scala


/.gitignore:
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1 | /.bsp/
2 | target/
3 | 


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/project/build.properties:
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1 | sbt.version=1.7.1
2 | 


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/project/plugins.sbt:
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1 | addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.7")


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/.vscode/settings.json:
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1 | {
2 |   "files.watcherExclude": {
3 |     "**/target": true
4 |   }
5 | }


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/README.md:
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1 | # Scala Native Ember Example
2 | 
3 | This is a minimal example showing the configuration to get an ember native application running.
4 | 
5 | Setup Locally, s2n is used for SSL.
6 | 
7 | ```
8 | brew install s2n
9 | ```


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/src/main/scala/example/EmberExample.scala:
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 1 | package example
 2 | 
 3 | import cats.syntax.all._
 4 | import cats.effect._
 5 | import cats.effect.std.Console
 6 | import org.http4s.ember.client.EmberClientBuilder
 7 | import org.http4s.ember.server.EmberServerBuilder
 8 | import org.http4s._
 9 | import org.http4s.client.Client
10 | import org.http4s.syntax.all._
11 | import org.http4s.circe._
12 | import org.http4s.dsl.request._
13 | import io.circe._
14 | import epollcat.EpollApp
15 | import fs2.io.net.Network
16 | import fs2.io.net.tls.S2nConfig
17 | import fs2.io.net.tls.TLSContext
18 | 
19 | object EmberExample extends EpollApp {
20 | 
21 |   final case class Joke(joke: String)
22 |   object Joke {
23 |     implicit val jokeDecoder: Decoder[Joke] = Decoder.derived[Joke]
24 |     implicit def jokeEntityDecoder[F[_]: Concurrent]: EntityDecoder[F, Joke] =
25 |       jsonOf
26 |   }
27 | 
28 |   def run(args: List[String]): IO[ExitCode] = customTLS
29 |     .flatMap(createClient)
30 |     .use{ client =>
31 |       createServer(client).useForever
32 |     }.as(ExitCode.Success)
33 | 
34 | 
35 |   def createServer(client: Client[IO]): Resource[IO, Unit] =
36 |     EmberServerBuilder.default[IO]
37 |       .withHttp2
38 |       .withHttpApp(app(client).orNotFound)
39 |       .build
40 |       .void
41 | 
42 |   def app(client: Client[IO]) = HttpRoutes.of[IO]{
43 |     case GET -> Root =>
44 |       Response[IO](Status.Ok).withEntity("Hey There!").pure[IO]
45 |     case GET -> Root / "hello" / person =>
46 |       Response[IO](Status.Ok).withEntity(s"Hello, $person").pure[IO]
47 |     case GET -> Root / "joke" => getJoke(client).map(Response(Status.Ok).withEntity(_))
48 |   }
49 | 
50 |   def getJoke(client: Client[IO]): IO[String] =
51 |     client.expect[Joke](Request(Method.GET, uri"https://icanhazdadjoke.com/"))
52 |       .map(_.joke)
53 | 
54 |   def createClient(tlsContext: TLSContext[IO]): Resource[IO, Client[IO]] = {
55 |     EmberClientBuilder
56 |       .default[IO]
57 |       .withTLSContext(tlsContext)
58 |       .withHttp2
59 |       .build
60 |   }
61 | 
62 |   // TLS 1.3 is not supported without a different default
63 |   def customTLS =
64 |     S2nConfig.builder
65 |       .withCipherPreferences("default_tls13")
66 |       .build[IO]
67 |       .map(Network[IO].tlsContext.fromS2nConfig(_))
68 | 
69 | }
70 | 
71 | object EmberServerExample


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