feat(tournament): federate tournaments across clusters with DB replication

- Replicate newly created tournaments to all registered remote servers,
  persisting them with originServerUrl so the remote can proxy mutations back
- Route all mutation endpoints (join/start/terminate/withdraw) through
  originServerUrl when set, instead of trying local state first
- Fix tournament event stream to proxy remote tournaments (was 404 before)
- Official bot now routes all calls through TOURNAMENT_SERVICE_URL (local
  tournament service) instead of calling remote cluster directly
- Bot parks on local account service + all registered remote servers on startup
- Add TOURNAMENT_SELF_URL env var so each cluster knows its own public URL

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

modules/official-bots/src/main/resources/application.yml

@@ -26,6 +26,8 @@ nowchess:
     prefix: nowchess
   internal:
     secret: 123abc
+  tournament:
+    service-url: http://localhost:8086
 
 "%deployed":
   quarkus:
@@ -49,3 +51,5 @@ nowchess:
       prefix: ${REDIS_PREFIX:nowchess}
     internal:
       secret: ${INTERNAL_SECRET}
+    tournament:
+      service-url: ${TOURNAMENT_SERVICE_URL:http://localhost:8086}

modules/official-bots/src/main/scala/de/nowchess/bot/resource/TournamentJoinResource.scala

@@ -25,15 +25,13 @@ class TournamentJoinResource:
   @POST
   @Path("/join-tournament")
   def joinTournament(req: JoinTournamentRequest): Response =
-    val serverUrl  = req.serverUrl.filter(_.nonEmpty).getOrElse(player.defaultServerUrl)
     val difficulty = if req.difficulty.nonEmpty then req.difficulty else "medium"
     log.infof(
-      "Official bot join requested — tournament=%s difficulty=%s server=%s",
+      "Official bot join requested — tournament=%s difficulty=%s",
       req.tournamentId,
       difficulty,
-      serverUrl,
     )
-    player.joinTournament(req.tournamentId, req.botToken, difficulty, serverUrl) match
+    player.joinTournament(req.tournamentId, req.botToken, difficulty) match
       case Right(botId) =>
         val resp = JoinTournamentResponse(botId, difficulty, "joining")
         Response.ok(resp).build()

modules/official-bots/src/main/scala/de/nowchess/bot/service/TournamentBotConfig.scala

@@ -20,7 +20,7 @@ object TournamentBotConfig:
       tournamentId <- env.get("TOURNAMENT_ID").filter(_.nonEmpty)
       token        <- env.get("TOURNAMENT_BOT_TOKEN").filter(_.nonEmpty)
       botId        <- jwtSubject(token)
-      serverUrl  = env.getOrElse("TOURNAMENT_SERVER_URL", "http://141.37.123.132:8086")
+      serverUrl  = env.getOrElse("TOURNAMENT_SERVICE_URL", "http://localhost:8086")
       difficulty = env.getOrElse("TOURNAMENT_BOT_DIFFICULTY", "medium")
     yield TournamentBotConfig(serverUrl, tournamentId, token, botId, difficulty)
 

modules/official-bots/src/main/scala/de/nowchess/bot/service/TournamentBotGamePlayer.scala

@@ -38,8 +38,8 @@ class TournamentBotGamePlayer:
   @volatile private var running = true
   // scalafix:on DisableSyntax.var
 
-  val defaultServerUrl: String =
-    System.getenv().asScala.getOrElse("TOURNAMENT_SERVER_URL", "http://141.37.123.132:8086")
+  val tournamentServiceUrl: String =
+    System.getenv().asScala.getOrElse("TOURNAMENT_SERVICE_URL", "http://localhost:8086")
 
   @PostConstruct
   def initialize(): Unit =
@@ -52,31 +52,41 @@ class TournamentBotGamePlayer:
         startAsync(cfg)
 
   private def parkOnStartup(): Unit =
-    park(defaultServerUrl, "expert") match
-      case Some(id) => log.infof("Parked expert bot on %s as id %s", defaultServerUrl, id)
-      case None     => log.warnf("Failed to park expert bot on %s", defaultServerUrl)
-
-  private def park(serverUrl: String, difficulty: String): Option[String] =
-    System.getenv().asScala.get("TOURNAMENT_BOT_TOKEN").filter(_.nonEmpty).flatMap { token =>
-      Try {
-        val body = s"""{"name":"${botName(difficulty)}"}"""
-        val response = client
-          .target(serverUrl)
-          .path("api")
-          .path("bots")
-          .request(MediaType.APPLICATION_JSON)
-          .header("Authorization", s"Bearer $token")
-          .post(Entity.entity(body, MediaType.APPLICATION_JSON))
-        if response.getStatus == 201 || response.getStatus == 200 then
-          val id = objectMapper.readTree(response.readEntity(classOf[String])).path("id").asText()
-          response.close()
-          Option(id).filter(_.nonEmpty)
-        else {
-          log.warnf("Parking bot %s returned status %d", botName(difficulty), response.getStatus); response.close();
-          None
+    val token = System.getenv().asScala.get("TOURNAMENT_BOT_TOKEN").filter(_.nonEmpty)
+    token match
+      case None => log.warn("TOURNAMENT_BOT_TOKEN not set — skipping park")
+      case Some(tok) =>
+        val localAccountUrl = System.getenv().asScala.getOrElse("ACCOUNT_SERVICE_URL", "http://localhost:8083")
+        BotController.listBots.foreach(diff => parkOn(localAccountUrl, diff, tok))
+        fetchRemoteServers().foreach { serverUrl =>
+          BotController.listBots.foreach(diff => parkOn(serverUrl, diff, tok))
         }
-      }.getOrElse(None)
-    }
+
+  private def fetchRemoteServers(): List[String] =
+    Try {
+      val response = client.target(tournamentServiceUrl)
+        .path("api").path("tournament").path("servers")
+        .request(MediaType.APPLICATION_JSON).get()
+      if response.getStatus == 200 then
+        val node = objectMapper.readTree(response.readEntity(classOf[String]))
+        response.close()
+        node.path("servers").elements().asScala.toList.map(_.path("url").asText()).filter(_.nonEmpty)
+      else { response.close(); Nil }
+    }.getOrElse(Nil)
+
+  private def parkOn(serverUrl: String, difficulty: String, token: String): Unit =
+    Try {
+      val body = s"""{"name":"${botName(difficulty)}"}"""
+      val response = client.target(serverUrl).path("api").path("bots")
+        .request(MediaType.APPLICATION_JSON)
+        .header("Authorization", s"Bearer $token")
+        .post(Entity.entity(body, MediaType.APPLICATION_JSON))
+      if response.getStatus == 201 || response.getStatus == 200 then
+        val id = objectMapper.readTree(response.readEntity(classOf[String])).path("id").asText()
+        log.infof("Parked bot %s on %s as id %s", botName(difficulty), serverUrl, id)
+      else log.warnf("Park %s on %s returned status %d", botName(difficulty), serverUrl, response.getStatus)
+      response.close()
+    }.failed.foreach(ex => log.warnf(ex, "Failed to park %s on %s", botName(difficulty), serverUrl))
 
   private def botName(difficulty: String): String = s"NowChess ${difficulty.capitalize}"
 
@@ -84,7 +94,6 @@ class TournamentBotGamePlayer:
       tournamentId: String,
       botToken: Option[String],
       difficulty: String,
-      serverUrl: String,
   ): Either[String, String] =
     val resolvedToken = botToken.filter(_.nonEmpty)
       .orElse(System.getenv().asScala.get("TOURNAMENT_BOT_TOKEN").filter(_.nonEmpty))
@@ -94,7 +103,7 @@ class TournamentBotGamePlayer:
         TournamentBotConfig.jwtSubject(token) match
           case None => Left("Invalid bot token — could not extract subject")
           case Some(botId) =>
-            val cfg = TournamentBotConfig(serverUrl, tournamentId, token, botId, difficulty)
+            val cfg = TournamentBotConfig(tournamentServiceUrl, tournamentId, token, botId, difficulty)
             if join(cfg) then
               startAsync(cfg)
               Right(botId)

modules/tournament/src/main/resources/application.yml

@@ -27,6 +27,8 @@ nowchess:
     prefix: ${REDIS_PREFIX:nowchess}
   internal:
     secret: ${INTERNAL_SECRET:123abc}
+  tournament:
+    self-url: ""
 
 mp:
   jwt:
@@ -46,6 +48,9 @@ mp:
     hibernate-orm:
       schema-management:
         strategy: update
+  nowchess:
+    tournament:
+      self-url: ${TOURNAMENT_SELF_URL:}
 
 "%test":
   quarkus:

modules/tournament/src/main/scala/de/nowchess/tournament/config/NativeReflectionConfig.scala

@@ -26,6 +26,7 @@ import io.quarkus.runtime.annotations.RegisterForReflection
     classOf[RoundPairingsDto],
     classOf[ErrorDto],
     classOf[OkDto],
+    classOf[ReplicateTournamentRequest],
     classOf[CorePlayerInfo],
     classOf[CoreTimeControl],
     classOf[CoreCreateGameRequest],

modules/tournament/src/main/scala/de/nowchess/tournament/domain/Tournament.scala

@@ -30,4 +30,7 @@ class Tournament:
   var startsAt: Instant  = uninitialized
   var winnerId: String   = uninitialized
   var winnerName: String = uninitialized
+
+  @Column(nullable = true)
+  var originServerUrl: String = null
   // scalafix:on

modules/tournament/src/main/scala/de/nowchess/tournament/dto/Dtos.scala

@@ -1,5 +1,7 @@
 package de.nowchess.tournament.dto
 
+import java.time.Instant
+
 case class BotRef(id: String, name: String)
 
 case class Clock(limit: Int, increment: Int)
@@ -72,3 +74,15 @@ case class RoundPairingsDto(round: Int, pairings: List[PairingDto])
 case class ErrorDto(error: String)
 
 case class OkDto(ok: Boolean = true)
+
+case class ReplicateTournamentRequest(
+    id: String,
+    fullName: String,
+    nbRounds: Int,
+    clockLimit: Int,
+    clockIncrement: Int,
+    rated: Boolean,
+    createdBy: String,
+    startsAt: Instant,
+    status: String,
+)

modules/tournament/src/main/scala/de/nowchess/tournament/resource/TournamentResource.scala

@@ -9,12 +9,12 @@ import de.nowchess.tournament.service.{
   TournamentService,
   TournamentStreamManager,
 }
-import io.smallrye.mutiny.Multi
 import jakarta.annotation.security.{PermitAll, RolesAllowed}
 import jakarta.enterprise.context.ApplicationScoped
 import jakarta.inject.Inject
 import jakarta.ws.rs.*
 import jakarta.ws.rs.core.{Context, HttpHeaders, MediaType, Response, StreamingOutput}
+import org.eclipse.microprofile.config.inject.ConfigProperty
 import org.eclipse.microprofile.jwt.JsonWebToken
 import org.jboss.logging.Logger
 import scala.compiletime.uninitialized
@@ -36,6 +36,9 @@ class TournamentResource:
   @Inject var externalClient: ExternalTournamentClient = uninitialized
   @Inject var objectMapper: ObjectMapper               = uninitialized
   @Context var headers: HttpHeaders                    = uninitialized
+
+  @ConfigProperty(name = "nowchess.tournament.self-url", defaultValue = "")
+  var selfUrl: String = uninitialized
   // scalafix:on
 
   @GET
@@ -85,6 +88,11 @@ class TournamentResource:
     val userId = Option(jwt.getSubject).getOrElse("")
     val form   = CreateTournamentForm(name, nbRounds, clockLimit, clockIncrement, rated)
     val t      = tournamentService.create(userId, form)
+    if selfUrl.nonEmpty then
+      registry.serverUrls().foreach { remoteUrl =>
+        if !externalClient.replicateTournament(remoteUrl, toReplicateRequest(t), selfUrl) then
+          log.warnf("Failed to replicate tournament %s to %s", t.id, remoteUrl)
+      }
     Response.status(Response.Status.CREATED).entity(tournamentService.toDto(t)).build()
 
   @GET
@@ -100,33 +108,59 @@ class TournamentResource:
           .flatMap(url => externalClient.fetch(url, id).map(node => Response.ok(node).build()))
           .getOrElse(Response.status(Response.Status.NOT_FOUND).entity(ErrorDto(s"Tournament $id not found")).build())
 
+  @POST
+  @Path("/replicate")
+  @PermitAll
+  def replicate(req: ReplicateTournamentRequest): Response =
+    val originUrl = Option(headers.getHeaderString("X-Origin-Url")).getOrElse("")
+    if originUrl.isEmpty then
+      Response.status(Response.Status.BAD_REQUEST).entity(ErrorDto("Missing X-Origin-Url header")).build()
+    else
+      tournamentService.get(req.id) match
+        case Some(_) => Response.status(Response.Status.CONFLICT).entity(ErrorDto("Tournament already exists")).build()
+        case None =>
+          tournamentService.replicate(req, originUrl)
+          Response.status(Response.Status.CREATED).build()
+
   @DELETE
   @Path("/{id}")
   @RolesAllowed(Array("**"))
   def terminate(@PathParam("id") id: String): Response =
     val userId = Option(jwt.getSubject).getOrElse("")
-    tournamentService.terminate(id, userId) match
-      case Right(_)    => Response.noContent().build()
-      case Left(error) => errorResponse(error)
+    tournamentService.get(id).flatMap(t => Option(t.originServerUrl)) match
+      case Some(originUrl) =>
+        val auth           = Option(headers.getHeaderString("Authorization"))
+        val (status, body) = externalClient.proxyPost(originUrl, s"api/tournament/$id", auth)
+        Response.status(status).entity(body).build()
+      case None =>
+        tournamentService.terminate(id, userId) match
+          case Right(_)    => Response.noContent().build()
+          case Left(error) => errorResponse(error)
 
   @POST
   @Path("/{id}/start")
   @RolesAllowed(Array("**"))
   def start(@PathParam("id") id: String): Response =
     val userId = Option(jwt.getSubject).getOrElse("")
-    tournamentService.start(id, userId) match
-      case Right(t) => Response.ok(tournamentService.toDto(t)).build()
-      case Left(error) =>
-        error match
-          case TournamentError.NotFound(_) =>
-            val auth = Option(headers.getHeaderString("Authorization"))
-            resolveServer(id)
-              .map { url =>
-                val (status, body) = externalClient.proxyPost(url, s"api/tournament/$id/start", auth)
-                Response.status(status).entity(body).build()
-              }
-              .getOrElse(errorResponse(error))
-          case _ => errorResponse(error)
+    tournamentService.get(id).flatMap(t => Option(t.originServerUrl)) match
+      case Some(originUrl) =>
+        val auth           = Option(headers.getHeaderString("Authorization"))
+        val (status, body) = externalClient.proxyPost(originUrl, s"api/tournament/$id/start", auth)
+        Response.status(status).entity(body).build()
+      case None =>
+        tournamentService.start(id, userId) match
+          case Right(t) => Response.ok(tournamentService.toDto(t)).build()
+          case Left(error) =>
+            error match
+              case TournamentError.NotFound(_) =>
+                val auth = Option(headers.getHeaderString("Authorization"))
+                resolveServer(id)
+                  .map { url =>
+                    val (status, body) = externalClient.proxyPost(url, s"api/tournament/$id/start", auth)
+                    Response.status(status).entity(body).build()
+                  }
+                  .getOrElse(errorResponse(error))
+              case _ => errorResponse(error)
 
   @POST
   @Path("/{id}/join")
@@ -136,21 +170,27 @@ class TournamentResource:
     if tokenType != "bot" then
       Response.status(Response.Status.FORBIDDEN).entity(ErrorDto("Only bots can join tournaments")).build()
     else
-      val botId   = Option(jwt.getSubject).getOrElse("")
-      val botName = Option(jwt.getClaim[AnyRef]("name")).map(_.toString).getOrElse(botId)
-      tournamentService.join(id, botId, botName) match
-        case Right(_) => Response.ok(OkDto()).build()
-        case Left(error) =>
-          error match
-            case TournamentError.NotFound(_) =>
-              val auth = Option(headers.getHeaderString("Authorization"))
-              resolveServer(id)
-                .map { url =>
-                  val (status, body) = externalClient.proxyPost(url, s"api/tournament/$id/join", auth)
-                  Response.status(status).entity(body).build()
-                }
-                .getOrElse(errorResponse(error))
-            case _ => errorResponse(error)
+      tournamentService.get(id).flatMap(t => Option(t.originServerUrl)) match
+        case Some(originUrl) =>
+          val auth           = Option(headers.getHeaderString("Authorization"))
+          val (status, body) = externalClient.proxyPost(originUrl, s"api/tournament/$id/join", auth)
+          Response.status(status).entity(body).build()
+        case None =>
+          val botId   = Option(jwt.getSubject).getOrElse("")
+          val botName = Option(jwt.getClaim[AnyRef]("name")).map(_.toString).getOrElse(botId)
+          tournamentService.join(id, botId, botName) match
+            case Right(_) => Response.ok(OkDto()).build()
+            case Left(error) =>
+              error match
+                case TournamentError.NotFound(_) =>
+                  val auth = Option(headers.getHeaderString("Authorization"))
+                  resolveServer(id)
+                    .map { url =>
+                      val (status, body) = externalClient.proxyPost(url, s"api/tournament/$id/join", auth)
+                      Response.status(status).entity(body).build()
+                    }
+                    .getOrElse(errorResponse(error))
+                case _ => errorResponse(error)
 
   @POST
   @Path("/{id}/withdraw")
@@ -160,20 +200,26 @@ class TournamentResource:
     if tokenType != "bot" then
       Response.status(Response.Status.FORBIDDEN).entity(ErrorDto("Only bots can withdraw")).build()
     else
-      val botId = Option(jwt.getSubject).getOrElse("")
-      tournamentService.withdraw(id, botId) match
-        case Right(_) => Response.ok(OkDto()).build()
-        case Left(error) =>
-          error match
-            case TournamentError.NotFound(_) =>
-              val auth = Option(headers.getHeaderString("Authorization"))
-              resolveServer(id)
-                .map { url =>
-                  val (status, body) = externalClient.proxyPost(url, s"api/tournament/$id/withdraw", auth)
-                  Response.status(status).entity(body).build()
-                }
-                .getOrElse(errorResponse(error))
-            case _ => errorResponse(error)
+      tournamentService.get(id).flatMap(t => Option(t.originServerUrl)) match
+        case Some(originUrl) =>
+          val auth           = Option(headers.getHeaderString("Authorization"))
+          val (status, body) = externalClient.proxyPost(originUrl, s"api/tournament/$id/withdraw", auth)
+          Response.status(status).entity(body).build()
+        case None =>
+          val botId = Option(jwt.getSubject).getOrElse("")
+          tournamentService.withdraw(id, botId) match
+            case Right(_) => Response.ok(OkDto()).build()
+            case Left(error) =>
+              error match
+                case TournamentError.NotFound(_) =>
+                  val auth = Option(headers.getHeaderString("Authorization"))
+                  resolveServer(id)
+                    .map { url =>
+                      val (status, body) = externalClient.proxyPost(url, s"api/tournament/$id/withdraw", auth)
+                      Response.status(status).entity(body).build()
+                    }
+                    .getOrElse(errorResponse(error))
+                case _ => errorResponse(error)
 
   @GET
   @Path("/{id}/results")
@@ -236,15 +282,81 @@ class TournamentResource:
   @Path("/{id}/stream")
   @RolesAllowed(Array("**"))
   @Produces(Array("application/x-ndjson"))
-  def stream(@PathParam("id") id: String): Multi[String] =
+  def stream(@PathParam("id") id: String): Response =
     tournamentService.get(id) match
-      case None => Multi.createFrom().failure(new NotFoundException(s"Tournament $id not found"))
+      case Some(t) if Option(t.originServerUrl).isDefined =>
+        val auth = Option(headers.getHeaderString("Authorization"))
+        externalClient.proxyGetStream(t.originServerUrl, s"api/tournament/$id/stream", auth)
+          .map { inputStream =>
+            Response
+              .ok(new StreamingOutput {
+                def write(output: java.io.OutputStream): Unit =
+                  val buf = new Array[Byte](4096)
+                  // scalafix:off DisableSyntax.var
+                  var n = inputStream.read(buf)
+                  while n >= 0 do
+                    output.write(buf, 0, n)
+                    output.flush()
+                    n = inputStream.read(buf)
+                // scalafix:on
+              })
+              .`type`("application/x-ndjson")
+              .build()
+          }
+          .getOrElse(Response.status(Response.Status.NOT_FOUND).entity(ErrorDto(s"Tournament $id stream unavailable")).build())
       case Some(_) =>
         val botId = Option(jwt.getSubject).getOrElse("")
-        Multi.createFrom().emitter[String] { emitter =>
-          streamManager.register(id, botId, emitter)
-          emitter.onTermination(() => streamManager.unregister(id, botId, emitter))
+        val queue   = new java.util.concurrent.LinkedBlockingQueue[Option[String]]()
+        val emitter = new io.smallrye.mutiny.subscription.MultiEmitter[String] {
+          def emit(item: String): io.smallrye.mutiny.subscription.MultiEmitter[String] =
+            queue.put(Some(item)); this
+          def fail(failure: Throwable): Unit = queue.put(None)
+          def complete(): Unit               = queue.put(None)
+          def requested(): Long              = Long.MaxValue
+          def isCancelled: Boolean           = false
+          def onTermination(
+              onTermination: java.lang.Runnable,
+          ): io.smallrye.mutiny.subscription.MultiEmitter[String] = this
         }
+        streamManager.register(id, botId, emitter)
+        Response
+          .ok(new StreamingOutput {
+            def write(output: java.io.OutputStream): Unit =
+              try
+                // scalafix:off DisableSyntax.var
+                var cont = true
+                while cont do
+                  queue.take() match
+                    case None       => cont = false
+                    case Some(line) =>
+                      output.write((line + "\n").getBytes("UTF-8"))
+                      output.flush()
+                // scalafix:on
+              finally streamManager.unregister(id, botId, emitter)
+          })
+          .`type`("application/x-ndjson")
+          .build()
+      case None =>
+        val auth = Option(headers.getHeaderString("Authorization"))
+        resolveServer(id)
+          .flatMap(url => externalClient.proxyGetStream(url, s"api/tournament/$id/stream", auth))
+          .map { inputStream =>
+            Response
+              .ok(new StreamingOutput {
+                def write(output: java.io.OutputStream): Unit =
+                  val buf = new Array[Byte](4096)
+                  // scalafix:off DisableSyntax.var
+                  var n = inputStream.read(buf)
+                  while n >= 0 do
+                    output.write(buf, 0, n)
+                    output.flush()
+                    n = inputStream.read(buf)
+                // scalafix:on
+              })
+              .`type`("application/x-ndjson")
+              .build()
+          }
+          .getOrElse(Response.status(Response.Status.NOT_FOUND).entity(ErrorDto(s"Tournament $id not found")).build())
 
   @GET
   @Path("/{id}/game/{gameId}")
@@ -297,15 +409,31 @@ class TournamentResource:
       .getOrElse(Response.status(Response.Status.NOT_FOUND).build())
 
   private def resolveServer(tournamentId: String): Option[String] =
-    registry.findServerUrl(tournamentId).orElse {
-      registry
-        .serverUrls()
-        .find(url => externalClient.fetch(url, tournamentId).isDefined)
-        .map { url =>
-          registry.bindTournament(tournamentId, url)
-          url
-        }
-    }
+    tournamentService.get(tournamentId)
+      .flatMap(t => Option(t.originServerUrl))
+      .orElse(registry.findServerUrl(tournamentId))
+      .orElse {
+        registry
+          .serverUrls()
+          .find(url => externalClient.fetch(url, tournamentId).isDefined)
+          .map { url =>
+            registry.bindTournament(tournamentId, url)
+            url
+          }
+      }
+
+  private def toReplicateRequest(t: de.nowchess.tournament.domain.Tournament): ReplicateTournamentRequest =
+    ReplicateTournamentRequest(
+      id = t.id,
+      fullName = t.fullName,
+      nbRounds = t.nbRounds,
+      clockLimit = t.clockLimit,
+      clockIncrement = t.clockIncrement,
+      rated = t.rated,
+      createdBy = t.createdBy,
+      startsAt = Option(t.startsAt).getOrElse(java.time.Instant.now()),
+      status = t.status,
+    )
 
   private def errorResponse(error: TournamentError): Response =
     val status = error match

modules/tournament/src/main/scala/de/nowchess/tournament/service/ExternalTournamentClient.scala

@@ -1,6 +1,7 @@
 package de.nowchess.tournament.service
 
 import com.fasterxml.jackson.databind.{JsonNode, ObjectMapper}
+import de.nowchess.tournament.dto.ReplicateTournamentRequest
 import jakarta.enterprise.context.ApplicationScoped
 import jakarta.inject.Inject
 import jakarta.ws.rs.client.{Client, ClientBuilder, Entity}
@@ -66,6 +67,21 @@ class ExternalTournamentClient:
         client.close()
     }.getOrElse((502, """{"error":"External server unreachable"}"""))
 
+  def replicateTournament(serverUrl: String, req: ReplicateTournamentRequest, selfUrl: String): Boolean =
+    Try {
+      val client  = buildClient()
+      val body    = objectMapper.writeValueAsString(req)
+      val response = client
+        .target(s"$serverUrl/api/tournament/replicate")
+        .request(MediaType.APPLICATION_JSON)
+        .header("X-Origin-Url", selfUrl)
+        .post(Entity.entity(body, MediaType.APPLICATION_JSON))
+      try response.getStatus / 100 == 2
+      finally
+        response.close()
+        client.close()
+    }.getOrElse(false)
+
   def proxyGetStream(serverUrl: String, path: String, authHeader: Option[String]): Option[java.io.InputStream] =
     Try {
       val client   = buildClient()

modules/tournament/src/main/scala/de/nowchess/tournament/service/TournamentService.scala

@@ -9,6 +9,7 @@ import de.nowchess.tournament.dto.{
   Clock,
   CreateTournamentForm,
   PairingDto,
+  ReplicateTournamentRequest,
   ResultDto,
   Standing,
   TournamentDto,
@@ -61,6 +62,23 @@ class TournamentService:
     tournamentRepository.persist(t)
     t
 
+  @Transactional
+  def replicate(req: ReplicateTournamentRequest, originServerUrl: String): Tournament =
+    val t = new Tournament()
+    t.id = req.id
+    t.fullName = req.fullName
+    t.nbRounds = req.nbRounds
+    t.clockLimit = req.clockLimit
+    t.clockIncrement = req.clockIncrement
+    t.rated = req.rated
+    t.status = req.status
+    t.currentRound = 0
+    t.createdBy = req.createdBy
+    t.startsAt = req.startsAt
+    t.originServerUrl = originServerUrl
+    tournamentRepository.persist(t)
+    t
+
   def get(id: String): Option[Tournament] =
     tournamentRepository.findOptById(id)