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http server keeping a state at server side / published by https://github.com/dacr/code-examples-manager #50add5a2-2132-4255-a56d-375d1ed6656b/498fd887cc292705fcfc66eea32078cd7f74cb0b
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// summary : http server keeping a state at server side | |
// keywords : scala, zio, tapir, http, zhttp, stateful, state, @testable, @exclusive | |
// publish : gist | |
// authors : David Crosson | |
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2) | |
// id : 50add5a2-2132-4255-a56d-375d1ed6656b | |
// created-on : 2022-03-20T07:26:31+01:00 | |
// managed-by : https://github.com/dacr/code-examples-manager | |
// run-with : scala-cli $file | |
// test-with : curl -L http://127.0.0.1:8080/hello/david | |
// --------------------- | |
//> using scala "3.3.1" | |
//> using dep "com.softwaremill.sttp.tapir::tapir-zio:1.9.4" | |
//> using dep "com.softwaremill.sttp.tapir::tapir-zio-http-server:1.9.4" | |
//> using lib "com.softwaremill.sttp.tapir::tapir-swagger-ui-bundle:1.9.4" | |
// --------------------- | |
/* | |
other examples : | |
- https://github.com/softwaremill/tapir/blob/master/examples/src/main/scala/sttp/tapir/examples/ZioExampleZioHttpServer.scala | |
*/ | |
import sttp.tapir.ztapir.* | |
import sttp.tapir.server.ziohttp.ZioHttpInterpreter | |
import sttp.apispec.openapi.Info | |
import sttp.tapir.swagger.bundle.SwaggerInterpreter | |
import zio.*, zio.http.Server | |
/* | |
curl -L http://127.0.0.1:8080/docs | |
curl http://127.0.0.1:8080/hello/david | |
curl http://127.0.0.1:8080/hello/joe | |
*/ | |
object WebApp extends ZIOAppDefault { | |
case class AppState(counters: Map[String, Int] = Map.empty) { | |
def manage(id: String): AppState = | |
copy(counters = counters + (id -> (1 + counters.getOrElse(id, 0)))) | |
} | |
// -------------------------------------------------- | |
def helloLogic(name: String) = | |
for { | |
ref <- ZIO.service[Ref[AppState]] | |
state <- ref.updateAndGet(state => state.manage(name)) | |
count = state.counters.getOrElse(name, 0) | |
} yield s"Hello $name $count" | |
val helloEndPoint = | |
endpoint | |
.description("Returns stateful greeting") | |
.get | |
.in("hello" ) | |
.in(path("name").example("joe")) | |
.out(stringBody) | |
val helloRoute = helloEndPoint.zServerLogic(helloLogic) | |
// -------------------------------------------------- | |
val docEndpoints = | |
SwaggerInterpreter() | |
.fromServerEndpoints( | |
List(helloRoute), | |
Info(title = "Greeting API", version = "1.0", description = Some("Everything required to be polite")) | |
) | |
// -------------------------------------------------- | |
val routes = ZioHttpInterpreter().toHttp(List(helloRoute) ++ docEndpoints) | |
// -------------------------------------------------- | |
val appStateLayer = ZLayer(Ref.make(AppState())) | |
override def run = | |
Server | |
.serve(routes) | |
.provide(appStateLayer, Server.default) | |
} | |
WebApp.main(Array.empty) |
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