Improve API plugin support (#1819)

Move `onKit` before `startApiServiceIfEnabled`.
This allows plugins to properly initialize before providing their routes.

Author: akumaigorodski

eclair-node/src/main/scala/fr/acinq/eclair/Boot.scala

@@ -20,7 +20,6 @@ import java.io.File
 
 import akka.actor.ActorSystem
 import akka.http.scaladsl.Http
-import akka.http.scaladsl.server.Route
 import akka.stream.BindFailedException
 import fr.acinq.eclair.api.Service
 import grizzled.slf4j.Logging
@@ -51,9 +50,9 @@ object Boot extends App with Logging {
     plugins.foreach(_.onSetup(setup))
     setup.bootstrap onComplete {
       case Success(kit) =>
+        plugins.foreach(_.onKit(kit))
         val routeProviderPlugins = plugins.collect { case plugin: RouteProvider => plugin }
         startApiServiceIfEnabled(kit, routeProviderPlugins)
-        plugins.foreach(_.onKit(kit))
       case Failure(t) => onError(t)
     }
   } catch {
@@ -80,8 +79,7 @@ object Boot extends App with Logging {
         override val password: String = apiPassword
         override val eclairApi: Eclair = new EclairImpl(kit)
       }
-      val pluginRoutes = providers.map(_.route(service))
-      Http().bindAndHandle(service.finalRoutes(pluginRoutes), config.getString("api.binding-ip"), config.getInt("api.port")).recover {
+      Http().newServerAt(config.getString("api.binding-ip"), config.getInt("api.port")).bindFlow(service.finalRoutes(providers)).recover {
         case _: BindFailedException => onError(TCPBindException(config.getInt("api.port")))
       }
     } else {

eclair-node/src/main/scala/fr/acinq/eclair/api/Service.scala

@@ -18,7 +18,7 @@ package fr.acinq.eclair.api
 
 import akka.actor.ActorSystem
 import akka.http.scaladsl.server._
-import fr.acinq.eclair.Eclair
+import fr.acinq.eclair.{Eclair, RouteProvider}
 import fr.acinq.eclair.api.directives.EclairDirectives
 import fr.acinq.eclair.api.handlers._
 import grizzled.slf4j.Logging
@@ -45,7 +45,8 @@ trait Service extends EclairDirectives with WebSocket with Node with Channel wit
    * This is the main entrypoint for the global http request router of the API service.
    * This is where we handle errors to ensure all routes are correctly tried before rejecting.
    */
-  def finalRoutes(extraRoutes: Seq[Route]): Route = securedHandler {
-    extraRoutes.foldLeft(nodeRoutes ~ channelRoutes ~ feeRoutes ~ pathFindingRoutes ~ invoiceRoutes ~ paymentRoutes ~ messageRoutes ~ onChainRoutes ~ webSocket)(_ ~ _)
+  def finalRoutes(extraRouteProviders: Seq[RouteProvider] = Nil): Route = securedHandler {
+    val baseRoutes = nodeRoutes ~ channelRoutes ~ feeRoutes ~ pathFindingRoutes ~ invoiceRoutes ~ paymentRoutes ~ messageRoutes ~ onChainRoutes ~ webSocket
+    extraRouteProviders.map(_.route(this)).foldLeft(baseRoutes)(_ ~ _)
   }
 }

eclair-node/src/test/scala/fr/acinq/eclair/api/ApiServiceSpec.scala

@@ -90,7 +90,7 @@ class ApiServiceSpec extends AnyFunSuite with ScalatestRouteTest with IdiomaticM
 
     override implicit val actorSystem: ActorSystem = system
 
-    val route: Route = finalRoutes(Seq(PluginApi.route(this)))
+    val route: Route = finalRoutes(PluginApi :: Nil)
   }
 
   def mockApi(eclair: Eclair = mock[Eclair]): MockService = {