Remove modules layer

backend/src/main/scala/com/softwaremill/bootzooka/DependenciesFactory.scala

@@ -0,0 +1,67 @@
+package com.softwaremill.bootzooka
+
+import cats.data.NonEmptyList
+import cats.effect.{IO, Resource}
+import com.softwaremill.bootzooka.config.Config
+import com.softwaremill.bootzooka.email.{EmailConfig, EmailModel, EmailService}
+import com.softwaremill.bootzooka.email.sender.{DummyEmailSender, EmailSender, MailgunEmailSender, SmtpEmailSender}
+import com.softwaremill.bootzooka.http.{Http, HttpApi, HttpConfig}
+import com.softwaremill.bootzooka.infrastructure.{DB, DBConfig}
+import com.softwaremill.bootzooka.metrics.{MetricsApi, VersionApi}
+import com.softwaremill.bootzooka.passwordreset.{PasswordResetApi, PasswordResetAuthToken, PasswordResetCodeModel}
+import com.softwaremill.bootzooka.security.{ApiKeyAuthToken, ApiKeyModel}
+import com.softwaremill.bootzooka.user.UserApi
+import com.softwaremill.bootzooka.util.{Clock, DefaultIdGenerator, IdGenerator}
+import com.softwaremill.macwire.autocats.autowire
+import doobie.util.transactor.Transactor
+import io.prometheus.client.CollectorRegistry
+import sttp.client3.SttpBackend
+
+object DependenciesFactory {
+  private case class Modules(api: HttpApi, emailService: EmailService)
+
+  def resource(config: Config, sttpBackend: Resource[IO, SttpBackend[IO, Any]], xa: Resource[IO, Transactor[IO]], clock: Clock): Resource[IO, (HttpApi, EmailService)] = {
+    lazy val collectorRegistry: CollectorRegistry = CollectorRegistry.defaultRegistry
+    lazy val idGenerator: IdGenerator = DefaultIdGenerator
+
+    def buildHttpApi(http: Http, userApi: UserApi, passwordResetApi: PasswordResetApi, metricsApi: MetricsApi, versionApi: VersionApi, collectorRegistry: CollectorRegistry, cfg: HttpConfig) =
+      new HttpApi(
+        http,
+        userApi.endpoints concatNel passwordResetApi.endpoints,
+        NonEmptyList.of(metricsApi.metricsEndpoint, versionApi.versionEndpoint),
+        collectorRegistry,
+        cfg)
+
+    def buildApiKeyAuthToken(apiKeyModel: ApiKeyModel): ApiKeyAuthToken = new ApiKeyAuthToken(apiKeyModel)
+
+    def buildPasswordResetAuthToken(passwordResetCodeModel: PasswordResetCodeModel): PasswordResetAuthToken = new PasswordResetAuthToken(passwordResetCodeModel)
+
+    def buildEmailSender(sttpBackend: SttpBackend[IO, Any], config: EmailConfig): EmailSender = if (config.mailgun.enabled) {
+      new MailgunEmailSender(config.mailgun, sttpBackend)
+    } else if (config.smtp.enabled) {
+      new SmtpEmailSender(config.smtp)
+    } else {
+      DummyEmailSender
+    }
+
+    def buildEmailScheduler(emailModel: EmailModel, idGenerator: IdGenerator, emailSender: EmailSender, config: EmailConfig, xa: Transactor[IO]) =
+      new EmailService(emailModel, idGenerator, emailSender, config, xa)
+
+    autowire[Modules](
+      config.api,
+      config.user,
+      config.passwordReset,
+      config.email,
+      idGenerator,
+      clock,
+      collectorRegistry,
+      sttpBackend,
+      xa,
+      buildHttpApi _,
+      buildApiKeyAuthToken _,
+      buildEmailScheduler _,
+      buildEmailSender _,
+      buildPasswordResetAuthToken _
+    ).map(modules => (modules.api, modules.emailService))
+  }
+}

backend/src/main/scala/com/softwaremill/bootzooka/Main.scala

@@ -1,46 +1,65 @@
 package com.softwaremill.bootzooka
 
-import cats.effect.IO
+import cats.data.NonEmptyList
+import cats.effect.{IO, Resource}
 import cats.effect.unsafe.implicits.global
-import com.softwaremill.bootzooka.config.Config
-import com.softwaremill.bootzooka.infrastructure.CorrelationId
-import com.softwaremill.bootzooka.metrics.Metrics
+import com.softwaremill.bootzooka.config.ConfigModule
+import com.softwaremill.bootzooka.email.{EmailConfig, EmailModel, EmailService}
+import com.softwaremill.bootzooka.email.sender.{DummyEmailSender, EmailSender, MailgunEmailSender, SmtpEmailSender}
+import com.softwaremill.bootzooka.http.{Http, HttpApi, HttpConfig}
+import com.softwaremill.bootzooka.infrastructure.{CorrelationId, DB, DBConfig, SetCorrelationIdBackend}
+import com.softwaremill.bootzooka.metrics.{Metrics, MetricsApi, VersionApi}
+import com.softwaremill.bootzooka.passwordreset.{PasswordResetApi, PasswordResetAuthToken, PasswordResetCode, PasswordResetCodeModel}
+import com.softwaremill.bootzooka.security.{ApiKey, ApiKeyAuthToken, ApiKeyModel, Auth}
+import com.softwaremill.bootzooka.user.UserApi
+import com.softwaremill.bootzooka.util.{Clock, DefaultClock, DefaultIdGenerator, IdGenerator}
 import com.typesafe.scalalogging.StrictLogging
-import doobie.util.transactor
 import sttp.client3.SttpBackend
 import com.softwaremill.macwire.autocats._
+import doobie.util.transactor.Transactor
+import io.prometheus.client.CollectorRegistry
+import sttp.capabilities.WebSockets
+import sttp.capabilities.fs2.Fs2Streams
+import sttp.client3.asynchttpclient.fs2.AsyncHttpClientFs2Backend
+import sttp.client3.logging.slf4j.Slf4jLoggingBackend
+import sttp.client3.prometheus.PrometheusBackend
 
 object Main extends StrictLogging {
   def main(args: Array[String]): Unit = {
     CorrelationId.init()
     Metrics.init()
     Thread.setDefaultUncaughtExceptionHandler((t, e) => logger.error("Uncaught exception in thread: " + t, e))
 
-    val initModule = new InitModule {}
+    val configModule = new ConfigModule {}
+    configModule.logConfig()
+    val config = configModule.config
 
-    initModule.logConfig()
+    lazy val clock: Clock = DefaultClock
 
-    def buildMainModule(_xa: transactor.Transactor[IO], _baseSttpBackend: SttpBackend[IO, Any], _config: Config) = new MainModule {
-      override def xa: transactor.Transactor[IO] = _xa
-      override def baseSttpBackend: SttpBackend[IO, Any] = _baseSttpBackend
-      override def config: Config = _config
-    }
+    lazy val sttpBackend: Resource[IO, SetCorrelationIdBackend[Fs2Streams[IO] with WebSockets]] =
+      AsyncHttpClientFs2Backend.resource[IO]().map(baseSttpBackend => new SetCorrelationIdBackend(
+      Slf4jLoggingBackend(PrometheusBackend(baseSttpBackend), includeTiming = true)
+    ))
+
+    lazy val xa = new DB(config.db).transactorResource
 
-    val mainTask = autowire[MainModule](
-      initModule.db.transactorResource,
-      initModule.baseSttpBackend,
-      initModule.config,
-      buildMainModule _
-    ).use { modules =>
+    val mainTask = DependenciesFactory.resource(
+      config = config,
+      sttpBackend = sttpBackend,
+      xa = xa,
+      clock = clock
+    ).use { case (httpApi, emailService) =>
       /*
       Sequencing two tasks using the >> operator:
       - the first starts the background processes (such as an email sender)
       - the second allocates the http api resource, and never releases it (so that the http server is available
         as long as our application runs)
        */
-      modules.startBackgroundProcesses >> modules.httpApi.resource.use(_ => IO.never)
+      emailService.startProcesses().void >> httpApi.resource.use(_ => IO.never)
     }
 
     mainTask.unsafeRunSync()
   }
 }
+
+case class Modules(emailService: EmailService, httpApi: HttpApi)

backend/src/main/scala/com/softwaremill/bootzooka/infrastructure/DB.scala

@@ -9,9 +9,9 @@ import org.flywaydb.core.Flyway
 import scala.concurrent.duration._
 import Doobie._
 import com.softwaremill.bootzooka.config.Sensitive
+import com.softwaremill.macwire.autocats.autowire
 
 import scala.concurrent.ExecutionContext
-import com.softwaremill.macwire.autocats._
 
 /** Configures the database, setting up the connection pool and performing migrations.
   */