Migrate from Blaze to Ember

build.sbt

@@ -8,13 +8,14 @@ lazy val root = (project in file("."))
     Compile / mainClass := Some("server.Main")
   )
 
-val http4sVersion = "0.23.16"
+val http4sVersion = "0.23.18"
 val circeVersion = "0.14.1"
 
 libraryDependencies ++= Seq(
   "org.http4s" %% "http4s-dsl" % http4sVersion,
-  "org.http4s" %% "http4s-blaze-server" % "0.23.9",
-  "org.http4s" %% "http4s-blaze-client" % "0.23.13",
+  "org.http4s" %% "http4s-server" % http4sVersion,
+  "org.http4s" %% "http4s-ember-server" % http4sVersion,
+  "org.http4s" %% "http4s-ember-client" % http4sVersion,
   "org.http4s" %% "http4s-circe" % http4sVersion,
 
   "ch.qos.logback" % "logback-classic" % "1.2.9",

src/main/scala/fetch/FetchService.scala

@@ -3,9 +3,9 @@ package fetch
 import cats.effect._
 import cats.implicits._
 import org.http4s._
-import org.http4s.blaze.client.BlazeClientBuilder
 import org.http4s.client.Client
 import org.http4s.headers.Authorization
+import org.http4s.ember.client.EmberClientBuilder
 
 import pureconfig._
 import pureconfig.generic.auto._
@@ -45,7 +45,7 @@ object FetchService {
 
   private def fetchFiles(fileNames: List[String]): IO[List[Either[Throwable, (String, String)]]] = {
     val IOUrls = baseUrl.map(baseUrl => fileNames.map(baseUrl / _))
-    BlazeClientBuilder[IO](global).resource.use { client =>
+    EmberClientBuilder.default[IO].build.use { client =>
       IOUrls.flatMap(_.traverse(url => makeRequest(client, url)))
     }
   }

src/main/scala/server/Main.scala

@@ -1,22 +1,23 @@
 package server
 import cats.effect._
+import cats.implicits.catsSyntaxTuple2Parallel
 import db.DBService
 import fetch.{FetchService, FileNameService}
-import fs2.Stream
 
 object Main extends IOApp {
   def run(args: List[String]): IO[ExitCode] = {
     val fetchTask = FileNameService.generateCurrentHour.flatMap(FetchService.fetchSingleFile)
-    Stream(
-      Server.run,
-      Scheduler.scheduleTask(fetchTask)
-        .evalMap { case (name, content) =>
-          IO(println(s"fetched: $name")) *>
-            DBService.save(name, content).attempt.flatMap {
-              case Right(savedName) => IO(println(s"File saved: $savedName"))
-              case Left(err) => IO(println(s"Error: $err"))
-            }
-        }
-    ).parJoinUnbounded.compile.drain.as(ExitCode.Success)
+    val scheduler = Scheduler.scheduleTask(fetchTask)
+      .evalMap { case (name, content) =>
+        IO(println(s"fetched: $name")) *>
+          DBService.save(name, content).attempt.flatMap {
+            case Right(savedName) => IO(println(s"File saved: $savedName"))
+            case Left(err) => IO(println(s"Error: $err"))
+          }
+      }.compile.drain // Convert Stream[IO, Unit] to IO[Unit]
+
+    val server = Server.run // This is an IO[Server]
+
+    (server, scheduler).parMapN((_, _) => ExitCode.Success)
   }
 }

src/main/scala/server/Server.scala

@@ -2,6 +2,7 @@ package server
 
 import cats.effect._
 import cats.implicits.toTraverseOps
+import com.comcast.ip4s.IpLiteralSyntax
 import db.DBService
 import fetch.FetchService
 import parse.{Parser, WeatherData}
@@ -9,14 +10,18 @@ import server.ValidateRoutes.{AggKey, CityList, DateTimeRange, ValidDate}
 import io.circe.{Json, Printer}
 import org.http4s._
 import org.http4s.dsl.io._
+import org.http4s.implicits._
 import org.http4s.server.{Router, staticcontent}
-import org.http4s.server.blaze.BlazeServerBuilder
+import org.http4s.server.middleware.CORS
+import org.http4s.server.middleware.CORSConfig
+import org.http4s.server.staticcontent.FileService
+import org.http4s.ember.server.EmberServerBuilder
 import io.circe.syntax._
 import parse.Aggregate.AggregateValueImplicits.aggregateValueEncoder
 import parse.Aggregate.{AggregateKey, UserQuery}
 import fs2.Stream
-import org.http4s.server.middleware.CORS
-import org.http4s.server.staticcontent.FileService
+
+import scala.concurrent.duration.DurationInt
 
 
 object Server {
@@ -91,16 +96,26 @@ object Server {
     }
   }
 
-  val apiRoutesCors = CORS(apiRoutes)
+  val corsConfig = CORSConfig.default
+    .withAnyOrigin(true)
+    .withAnyMethod(true)
+    .withAllowedMethods(Some(Set(Method.GET, Method.POST)))
+    .withAllowCredentials(false)
+    .withMaxAge(1.day)
+
+  val apiRoutesCors = CORS(apiRoutes, corsConfig)
 
   private val httpApp = Router(
     "/" -> staticcontent.fileService[IO](FileService.Config("./web/dist")),
     "/api" -> apiRoutesCors
   ).orNotFound
 
-  def run: Stream[IO, ExitCode] =
-    BlazeServerBuilder[IO]
-      .bindHttp(8080, "0.0.0.0")
-      .withHttpApp(httpApp)
-      .serve
+  def run: IO[ExitCode] =
+      EmberServerBuilder
+        .default[IO]
+        .withHost(ipv4"0.0.0.0")
+        .withPort(port"8080")
+        .withHttpApp(httpApp)
+        .build
+        .useForever
 }

web/.env.development

@@ -1 +1 @@
-VITE_API_HOST=http://localhost:8080
+VITE_API_HOST=http://0.0.0.0:8080